CN215620884U

CN215620884U - Ink circulation system of industrial printer

Info

Publication number: CN215620884U
Application number: CN202122343251.8U
Authority: CN
Inventors: 陈培鑫; 刘林森
Original assignee: Guangzhou Color New Electronic Technology Co ltd
Current assignee: Guangzhou Color New Electronic Technology Co ltd
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2022-01-25
Anticipated expiration: 2031-09-26

Abstract

The utility model relates to the field of industrial printers, in particular to an ink circulating system of an industrial printer, which comprises: the ink jet head comprises an ink jet head and an ink circulation branch connected with the ink jet head, wherein the ink circulation branch comprises: the ink containing cavity is communicated with the ink gun through a liquid supply channel; one end of the ink guide cavity is communicated with the ink gun, and the other end of the ink guide cavity is communicated with the liquid supply channel; the liquid return channel is connected with the ink accommodating cavity and the ink guide cavity; the ink circulation system further includes: and the pressure control assembly is respectively connected with the ink guide cavity and the ink containing cavity. The problem of blockage caused by blockage of a driving device such as a liquid pump is solved by the circulating flow of the ink without directly contacting the driving device; the low flow rate can be accurately adjusted by controlling the pressure in the ink circulation branch; the pressure control assembly enables the ink containing cavity and the ink guide cavity to be consistent with the ambient normal pressure, ink in the ink gun can automatically flow out to realize quick cleaning and waste ink discharging of the ink gun, and the maintenance difficulty is reduced.

Description

Ink circulation system of industrial printer

Technical Field

The utility model relates to the field of industrial printers, in particular to an ink circulating system of an industrial printer.

Background

The industrial printer is a non-contact ink-jet digital printing device, and can print color patterns on the surfaces of various plane materials. The printing machine has wide applicability, and can be used for quickly printing patterns on metal, ceramics, crystal, glass, acrylic, PVC, plastics, toys, leather, USB flash disks, cloth, wood, silica gel, rice paper and the like. With the continuous development of printing structures and ink, more and more media can be directly printed through an industrial printer, and images are more and more beautiful in color and vivid in effect and have more functions, such as water resistance, sun protection, strong wear-resistant adhesive force, fastness, strong stereoscopic impression and the like. The improvement of printing precision and the fineness of images are always the key directions for the development of industrial printers.

The quality of printing precision and image promotes the technological promotion that can't leave printing the shower nozzle, in order to reach better effect and careful image, and the printing shower nozzle on the printer is more and more, and the size is also more and more littleer, and further in order to save space, convenient control, a large amount of shower nozzles are integrated in a printing module. With such a design, although the quality of the image is improved, maintenance of the print head becomes increasingly difficult. In a conventional ink supply system for a head, ink is left standing in the head until ink is ejected, and once the ink is left standing for too long or fine particles exist in the ink, the head is easily clogged. Especially, the problem that the nozzle with small ink dots is blocked easily exists, the failure rate is improved due to the integration of a large number of nozzles, the whole service life is shortened, and the maintenance time is long each time.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome at least one defect of the prior art and provides an ink circulation system of an industrial printer, which is used for solving the problems of printing nozzle blockage caused by easy precipitation of ink, large number of printing nozzles, large integration and complex maintenance.

The technical scheme adopted by the utility model is that an ink circulating system of an industrial printer comprises: the ink jet head comprises an ink jet head and an ink circulation branch connected with the ink jet head, wherein the ink circulation branch comprises: the ink containing cavity is communicated with the ink gun through a liquid supply channel; one end of the ink guide cavity is communicated with the ink gun, and the other end of the ink guide cavity is communicated with the liquid supply channel; the liquid return channel is connected with the ink accommodating cavity and the ink guide cavity; the ink circulation system further includes: and the pressure control assembly is respectively connected with the ink guide cavity and the ink containing cavity.

In the technical scheme, the ink gun is used for spraying ink; the ink circulation branch is used for enabling the ink in the ink gun to circularly flow, and the ink gun is prevented from being blocked due to ink solidification or the ink is prevented from precipitating due to long-time standing to influence the effect of the ink; the ink containing cavity is used for storing ink; the liquid supply channel is used for guiding the ink in the ink accommodating cavity into the ink gun; the ink guide cavity is used for providing power for ink flowing in the ink circulation branch; the liquid return channel is used for limiting the flow direction of the ink and forming the orderly and circular flow of the ink; the pressure control assembly is used for controlling the change of air pressure formed in the ink guide cavity, so that the ink guide cavity has power for guiding ink to flow.

The ink guide cavity forms air pressure difference under the action of the pressure control assembly, the air pressure difference drives ink to enter the ink guide cavity from the ink cavity through the liquid supply channel after passing through the ink gun, and then the ink is guided by the liquid return channel to form unidirectional circulation of the ink, and in the ink circulation branch, the ink does not need to directly contact with a driving device in the circulation flow of the ink, so that the problem of blockage caused by blockage of the driving device such as a liquid pump is solved, and the faults are reduced; secondly, the low flow rate can be accurately adjusted by controlling the pressure in the ink circulation branch, so that the flow rate is matched with the characteristics of the ink, the problems of ink sedimentation or layering and the like are reduced, the blockage is improved, the speed of ink quality reduction is slowed down, and the faults are reduced; and thirdly, a non-pressure state can be further formed through the pressure control assembly, namely, the ink containing cavity and the ink guide cavity are consistent with the ambient normal pressure, and under the action of the matching gravity, the ink in the ink gun can automatically flow out to the accumulated ink to be completely emptied, so that the quick cleaning and waste ink discharging of the ink gun are realized, the maintenance time is saved, and the maintenance difficulty is reduced.

Preferably, a liquid level detector is arranged in the ink containing cavity and/or the ink guide cavity. In the technical scheme, the liquid level detector is used for automatically controlling the liquid level height of the ink in the ink containing cavity and the ink guide cavity, the system can identify and control the use condition of the ink in the ink containing cavity and the ink guide cavity by automatically controlling the liquid level of the ink, and the alarm is timely provided, or the automatic ink adding is controlled, or the pressure of the ink guide cavity is adjusted to realize the ink quantity distribution between the ink containing cavity and the ink guide cavity.

Preferably, the liquid supply channel and/or the liquid return channel are/is provided with a temperature control device. In this technical scheme, temperature control device is used for adjusting the temperature of ink, makes the ink remain throughout under suitable service temperature, avoids external environment to cause the ink temperature to hang down or too high to promote the effect and the image quality of printing.

Preferably, a filtering device is further arranged in the ink accommodating cavity, and the liquid return channel is communicated with the inside of the ink accommodating cavity through the filtering device. In the technical scheme, the filtering device is used for filtering precipitates and impurities in ink, so that the quality of the ink entering the ink gun is guaranteed, the blockage of the ink gun is reduced, and the faults are reduced.

Preferably, the ink box is further included and is communicated with the ink guide cavity through the ink replenishing channel. In the technical scheme, the ink box is used for supplementing the total flowing ink amount of the ink circulation branch, and the ink in the ink box can be supplemented into the ink guide cavity through the ink supplementing channel.

Preferably, a connector is arranged at the joint of the ink replenishing channel and the ink box, the connector comprises a connection driving device and a contact detection device, and the connector is connected with the liquid level detector. In the technical scheme, the connector is used for controlling the connection and disconnection of the ink box and the ink supplementing channel, the connection driving device is used for driving the ink supplementing channel to be connected with the ink box and controlling the connection and the closing of the ink supplementing channel and the ink guide cavity, the contact detection device is used for detecting the position between the ink box and the ink supplementing channel, and the automatic ink supplementing can be realized through the connector.

Preferably, the ink cartridge is located above the ink containing chamber, and the ink guide chamber is located below the ink containing chamber. In this technical scheme, the position of ink horn is injectd and is made the speed that the ink can utilize the effect of gravity to promote the benefit black, and holds the injectment of ink chamber position and help making the ink flow through the ink gun, and the process that gets into this section route of leading the ink chamber is under the effect of gravity more smooth, even negative pressure fails suddenly, this section circulation still can keep a period of buffering time under the effect of gravity.

Preferably, the ink containing cavity is provided with a first ink containing area and a space area positioned above the first ink containing area, and the liquid supply channel and the liquid return channel are communicated with the first ink containing area. In the technical scheme, the first ink containing area is used for storing ink, and the empty area is an air area; in order to avoid air entering the liquid-circulating duct and to maintain a continuous supply of ink during circulation, the liquid supply duct and the liquid return channel need to be in communication with the first ink containing zone.

Preferably, the ink guide cavity is provided with a second ink containing area and a pressure regulating area positioned above the second ink containing area; the pressure control assembly is communicated with the pressure regulating section; the liquid return channel is communicated with the second ink containing area. In the technical scheme, the second ink containing area is used for storing ink, the pressure regulating area is an air area and used for regulating the pressure in the ink guide cavity, and the pressure control assembly is used for regulating the flow rate of the ink circulating branch by controlling the gas in the air area to form different pressures; in order to avoid the ink from entering the pressure control assembly, the pressure control assembly needs to be communicated with the air area and far away from the second ink containing area, and the communicating openings of the circulating liquid return channel and the ink guide cavity need to be arranged in the second ink containing area to ensure that the circulating liquid return channel and the liquid return channel are covered by the ink.

Preferably, the pressure control assembly comprises a normal pressure channel and a negative pressure channel, the normal pressure channel is connected with the ink containing cavity, and the negative pressure channel is connected with the ink guide cavity. In the technical scheme, the normal pressure channel is used for applying gas to the ink containing cavity, so that the ink containing cavity is in a normal pressure state, the speed of ink entering the ink gun is accelerated, and in the ink discharging and cleaning process of the ink gun, the negative pressure in the ink circulation branch is eliminated through the normal pressure channel, so that the automatic ink discharging and cleaning of the ink gun are realized; the negative pressure channel is used for extracting gas in the ink guide cavity to enable the ink guide cavity to be in a negative pressure state, and when the ink guide cavity normally runs, the negative pressure channel guides ink to circulate.

Compared with the prior art, the utility model has the beneficial effects that: the ink does not need to directly contact with a driving device in the circulating flow, so that the problem of blockage caused by blockage of the driving device such as a liquid pump is solved, and the faults are reduced; the low flow rate can be accurately adjusted by controlling the pressure in the ink circulation branch, so that the flow rate is matched with the characteristics of the ink, the problems of ink sedimentation or layering and the like are reduced, the blockage is improved, the speed of ink quality reduction is slowed down, and the faults are reduced; the non-pressure state can be formed through the pressure control assembly, the ink containing cavity and the ink guide cavity are consistent with the ambient normal pressure, the ink in the ink gun can automatically flow out to the accumulated ink to be completely emptied under the action of the matched gravity, the quick cleaning and the waste ink discharging of the ink gun are realized, the maintenance time is saved, and the maintenance difficulty is reduced.

Drawings

Fig. 1 is an overall schematic view of the present invention.

FIG. 2 is a schematic diagram of an embodiment of the present invention.

Description of reference numerals: the ink jet head comprises an ink containing cavity 110, a first ink containing area 111, a vacant area 112, an ink guiding cavity 120, a second ink containing area 121, a pressure regulating area 122, an ink box 130, a connector 131, a liquid level detector 101, a temperature control device 102, a filtering device 103, a liquid supply channel 201, a liquid return channel 202, a liquid supplementing channel 203, a pressure control assembly 300, a normal pressure channel 301, a negative pressure channel 302 and an ink jet head 001.

Detailed Description

The drawings are only for purposes of illustration and are not to be construed as limiting the utility model. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Example 1

As shown in fig. 1, the present embodiment is an ink circulation system of an industrial printer, including: the ink jet head 001 and the ink circulation branch connected with the ink jet head 001, the ink circulation branch includes: the ink accommodating cavity 110 is communicated with the ink gun 001 through a liquid supply channel 201; an ink guide chamber 120, one end of which is communicated with the ink gun 001 and the other end of which is communicated with the liquid supply channel 201; a liquid return channel 202 connecting the ink containing chamber 110 and the ink guide chamber 120; the ink circulation system further includes: and a pressure control assembly 300 connected to the ink guide chamber 120 and the ink containing chamber 110, respectively. A liquid level detector 101 is disposed in the ink containing chamber 110 and/or the ink guide chamber 120. The liquid supply channel 201 and/or the liquid return channel 202 are/is provided with a temperature control device 102. The ink containing cavity 110 is also internally provided with a filter device 103, and the liquid return channel 202 is communicated with the interior of the ink containing cavity 110 through the filter device 103.

The ink circulation system further includes an ink cartridge 130, and the ink cartridge 130 communicates with the ink guide chamber 120 through an ink replenishing passage. The joint of the ink replenishing channel and the ink box 130 is provided with a connector 131, the connector 131 comprises a connection driving device and a contact detection device, and the connector 131 is connected with the liquid level detector 101. The ink cartridge 130 is located above the ink containing chamber 110, and the ink guiding chamber 120 is located below the ink containing chamber 110, as shown in fig. 2. The ink containing cavity 110 is provided with a first ink containing area 111 and a space 112 above the first ink containing area 111, and a liquid supply channel 201 and a liquid return channel 202 are communicated with the first ink containing area 111. The ink guide cavity 120 is provided with a second ink containing interval 121 and a pressure regulating interval 122 positioned above the second ink containing interval 121; the pressure control assembly 300 is communicated with the pressure regulating section 122; the liquid return passage 202 communicates with the second ink containing section 121. The pressure control assembly 300 includes a normal pressure passage 301 and a negative pressure passage 302, the normal pressure passage 301 is connected to the ink containing chamber 110, and the negative pressure passage 302 is connected to the ink guide chamber 120.

Example 2

This embodiment is an ink circulation system of an industrial printer, including: the ink jet head 001 and the ink circulation branch connected with the ink jet head 001, the ink circulation branch includes: the ink accommodating cavity 110 is communicated with the ink gun 001 through a liquid supply channel 201; an ink guide chamber 120, one end of which is communicated with the ink gun 001 and the other end of which is communicated with the liquid supply channel 201; a liquid return channel 202 connecting the ink containing chamber 110 and the ink guide chamber 120; the ink circulation system further includes: and a pressure control assembly 300 connected to the ink guide chamber 120 and the ink containing chamber 110, respectively.

The inkjet head 001 is used to eject ink; the ink circulation branch is used for enabling the ink in the ink gun 001 to flow circularly, so that the ink gun 001 is prevented from being blocked due to ink solidification, or the ink is prevented from being settled for a long time to influence the ink effect; the ink containing chamber 110 is used for storing ink; the liquid supply channel 201 is used for guiding the ink in the ink containing cavity 110 into the ink gun 001; the ink guide cavity 120 is used for providing the power for the ink flowing in the ink circulation branch; the liquid return channel 202 is used for limiting the flow direction of the ink and forming the orderly circulation flow of the ink; the pressure control assembly 300 is used to control the change of air pressure in the ink guide chamber 120, so that the ink guide chamber 120 has power for guiding ink flow.

Specifically, the industrial printer is provided with a printing module, and the printing module is internally provided with a plurality of ink-jet heads 001; each different ink has an independent ink circulation branch, a plurality of ink circulation branches form a monochrome main branch in the printing module, and the monochrome main branch is communicated with each ink gun 001 to form a small circulation in the ink gun 001. The ink containing cavity 110 and the ink guide cavity 120 are sealed containers; the liquid supply channel 201 is connected with the bottom of the ink containing cavity 110, the liquid return channel 202 is connected with the bottom of the ink guide cavity 120, the ink gun 001 is connected with the ink guide cavity 120 through a return channel, and the return channel, the liquid supply channel 201 and the liquid return pipeline can be hard pipes or hoses. One end of the return channel is connected to the inkjet head 001, and the other end enters the ink guide chamber 120 and extends to a position of the ink guide chamber 120 near the bottom to form an opening, which is communicated with the lower part in the ink guide chamber 120.

A liquid level detector 101 is disposed in the ink containing chamber 110 and/or the ink guide chamber 120. The liquid level detector 101 is used for automatically controlling the liquid level heights of the inks in the ink containing cavity 110 and the ink guide cavity 120, so that the system can identify and control the use conditions of the inks in the ink containing cavity 110 and the ink guide cavity 120 by automatically controlling the liquid levels of the inks, and timely give an alarm or control the automatic ink supplement or adjust the pressure of the ink guide cavity 120 to realize the ink amount distribution between the ink containing cavity 110 and the ink guide cavity 120. Specifically, the liquid level detector 101 can be connected to the pressure control assembly 300 to provide a reference for pressure control; meanwhile, the detector can be further connected with a control center of the system to provide signals for controlling the supplement or triggering of the ink.

The liquid supply channel 201 and/or the liquid return channel 202 are/is provided with a temperature control device 102. The temperature control device 102 is used for adjusting the temperature of the ink, and specifically, the temperature control device 102 on the liquid supply channel 201 is a heat preservation device and is mainly used for maintaining the temperature of the ink entering the ink gun 001; the temperature control device 102 on the liquid return channel 202 is a temperature raising device for controlling the temperature of the ink circulation branch.

The ink containing cavity 110 is also internally provided with a filter device 103, and the liquid return channel 202 is communicated with the interior of the ink containing cavity 110 through the filter device 103. The filter device 103 is used for filtering sediment and impurities in the ink, and specifically, the filter device 103 can be a hollow cavity made of a filter material and having an opening at the lower part.

The ink circulation system further includes an ink cartridge 130, and the ink cartridge 130 communicates with the ink guide chamber 120 through an ink replenishing passage. The ink box 130 is used for supplementing the total amount of ink flowing in the ink circulation branch, and the ink in the ink box 130 can be supplemented into the ink guide cavity 120 through the ink supplementing channel. Specifically, the ink cartridge 130 is detachably connected to the ink replenishment path, and the ink can be quickly replenished by quickly replacing the ink cartridge 130.

The joint of the ink replenishing channel and the ink box 130 is provided with a connector 131, the connector 131 comprises a connection driving device and a contact detection device, and the connector 131 is connected with the liquid level detector 101. The connector 131 is used for controlling the on-off of the ink box 130 and the ink supplementing channel, the connection driving device is used for driving the ink supplementing channel to be connected with the ink box 130 and controlling the connection and the closing of the ink supplementing channel and the ink guide cavity 120, the contact detection device is used for detecting the position between the ink box 130 and the ink supplementing channel, and the automatic ink supplementing can be achieved through the connector 131. Specifically, the contact detection device is a contact switch, the connection driving device comprises a motor, a supply valve and an interface, the interface is communicated with the inside of the ink box 130, the contact detection device can be matched with a contact on the ink box 130, and the supply valve controls the switch of the ink replenishing channel.

The ink cartridge 130 is located above the ink containing chamber 110, and the ink guiding chamber 120 is located below the ink containing chamber 110. The position of the ink cartridge 130 is defined to increase the speed of replenishing ink by gravity, and the position of the ink containing chamber 110 is defined to help the ink flowing through the ink jet head 001 to enter the ink guide chamber 120 in a path which is smoother by gravity, and specifically, the ink circulation branch and the pressure control assembly 300 are disposed on the same mounting bracket.

The ink containing cavity 110 is provided with a first ink containing area 111 and a space 112 above the first ink containing area 111, and a liquid supply channel 201 and a liquid return channel 202 are communicated with the first ink containing area 111. The first ink containing section 111 is used for storing ink, and the empty section 112 is an air zone; specifically, the first ink containing section 111 and the empty section 112 are divided and controlled by the liquid level detector 101. The communication ports of the liquid return channel 202 and the liquid supply channel 201 with the ink containing chamber 110 need to be kept below the liquid level of the ink continuously.

The ink guide cavity 120 is provided with a second ink containing interval 121 and a pressure regulating interval 122 positioned above the second ink containing interval 121; the pressure control assembly 300 is communicated with the pressure regulating section 122; the liquid return passage 202 communicates with the second ink containing section 121. The second ink containing area 121 is used for storing ink, the pressure regulating area 122 is an air area and is used for regulating the pressure in the ink guide cavity 120, and the pressure control assembly 300 forms different pressures by controlling the air in the air area, so as to regulate the flow rate of the ink circulation branch; specifically, the second ink containing section 121 and the pressure regulating section 122 are divided and controlled by the liquid level detector 101 in the ink guide chamber 120. The return channel, the fluid infusion channel 203 and the communication ports of the return channel and the ink guide cavity 120 are all required to be arranged below the liquid level.

The pressure control assembly 300 includes a normal pressure passage 301 and a negative pressure passage 302, the normal pressure passage 301 is connected to the ink containing chamber 110, and the negative pressure passage 302 is connected to the ink guide chamber 120. The normal pressure channel 301 is used for applying gas to the ink containing cavity 110, so that the ink containing cavity 110 is in a normal pressure state, the speed of ink entering the ink gun 001 is accelerated, and in the ink discharging and cleaning process of the ink gun 001, the negative pressure in the ink circulation branch is eliminated through the normal pressure channel 301, so that the ink gun 001 can automatically discharge waste ink and clean; the negative pressure channel 302 is used for pumping the air in the ink guide cavity 120 to make the ink guide cavity 120 in a negative pressure state, and when the ink guide cavity operates normally, the negative pressure channel 302 guides the ink to circulate. Specifically, the negative pressure is formed in the ink guide cavity 120 by pumping the air in the ink guide cavity 120, and since the one-way liquid return channel 202 is arranged between the ink guide cavity 120 and the ink containing cavity 110, the negative pressure in the ink guide cavity 120 can only act on the return channel, and under the action of gravity and the negative pressure, the ink in the ink containing cavity 110 enters the ink guide cavity 120 through the ink jet head 001 and the return channel via the liquid supply channel 201, and since the ink in the ink containing cavity 110 is reduced and the ink containing cavity 110 is a sealed container, the ink reduction causes a certain negative pressure to be generated in the ink containing cavity 110, and since the pressure for pumping the ink through the liquid return channel 202 is smaller than the pressure for pumping the ink from the liquid supply channel 201, the ink containing cavity 110 can pump the ink from the ink guide cavity 120 through the liquid return channel 202, thereby realizing circulation.

Example 3

This embodiment is an ink circulation system of an industrial printer, including: the ink jet head 001 and the ink circulation branch connected with the ink jet head 001, the ink circulation branch includes: the ink accommodating cavity 110 is communicated with the ink gun 001 through a liquid supply channel 201; an ink guide chamber 120, one end of which is communicated with the ink gun 001 and the other end of which is communicated with the liquid supply channel 201; a liquid return channel 202 connecting the ink containing chamber 110 and the ink guide chamber 120; the ink circulation system further includes: and a pressure control assembly 300 connected to the ink guide chamber 120 and the ink containing chamber 110, respectively. The inkjet head 001 is used to eject ink; the ink circulation branch is used for enabling the ink in the ink gun 001 to flow circularly, so that the ink gun 001 is prevented from being blocked due to ink solidification, or the ink is prevented from being settled for a long time to influence the ink effect; the ink containing chamber 110 is used for storing ink; the liquid supply channel 201 is used for guiding the ink in the ink containing cavity 110 into the ink gun 001; the ink guide cavity 120 is used for providing the power for the ink flowing in the ink circulation branch; the liquid return channel 202 is used for limiting the flow direction of the ink and forming the orderly circulation flow of the ink; the pressure control assembly 300 is used to control the change of air pressure in the ink guide chamber 120, so that the ink guide chamber 120 has power for guiding ink flow.

In this embodiment, an industrial printer has six ink-jet heads 001 in a module, three ink circulation branches, and three monochrome main branches in the printing module. The three single-color main branches respectively form a small circulation with each ink-jet head 001, so that the ink circularly flows in the ink-jet head 001. The bottoms of the ink containing cavity 110 and the ink guide cavity 120 are provided with horizontal planes, the liquid supply channel 201 is communicated with the ink containing cavity 110 through the horizontal planes, and the liquid return channel 202 is connected with the ink guide cavity 120 through the horizontal planes. The backflow channel, the liquid supply channel 201 and the liquid return channel 202 are all PVC hoses, the liquid return channel 202 is provided with a one-way valve, the liquid return channel 202 in each ink circulation branch is provided with an independent one-way valve, and the one-way valve only allows ink to enter the ink containing cavity 110 from the ink guide cavity 120 and prevents the ink in the ink containing cavity 110 from flowing back to the ink guide cavity 120.

When the ink jet head is used, in the operation process of the industrial printer, ink continuously flows in the ink circulation branch and flows through the ink jet head 001, and the ink jet head 001 ejects the flowing ink through the structure of the ink jet head 001 to print. When the printer performs printing operation, the ink in the ink accommodating cavity 110 at least covers one end of the liquid supply channel 201, the ink in the ink guide cavity 120 at least covers one end of the liquid return channel 202, one end of the liquid return channel in the ink guide cavity 120 is positioned below the liquid level, a certain air space is reserved in the ink guide cavity 120, and the pressure control assembly 300 is communicated with the air space; the pressure control assembly 300 forms a negative pressure in the ink guiding chamber 120, and the ink returns to the ink containing chamber 110 after passing through the ink containing chamber 110, the liquid supply channel 201, the backflow channel, the ink guiding chamber 120 and the liquid returning channel 202. When used for purging, the pressure control assembly 300 makes the pressure in the ink guide chamber 120 coincide with the normal pressure, and the ink introduced into the inkjet head 001 naturally flows out through the inkjet head 001 due to the lack of the pumping force of the negative pressure, thereby achieving rapid maintenance of the inkjet head 001.

A liquid level detector 101 is disposed in the ink containing chamber 110 and/or the ink guide chamber 120. The liquid level detector 101 is used for automatically controlling the liquid level height of the ink in the ink containing cavity 110 and the ink guide cavity 120; in this embodiment, the ink containing cavity 110 and the ink guiding cavity 120 are both provided with a liquid level detector 101. When the ink level detector is used, the position of the liquid level detector 101 is set to be located between the first ink containing area 111 and the first pressure regulating area 122, when the liquid level of ink drops to a certain position, the liquid level detector 101 triggers the control valve to be communicated, so that the ink in the ink box 130 enters the ink guide cavity 120 through the liquid supplementing channel 203, and meanwhile, the negative pressure in the ink guide cavity 120 is properly regulated to adjust the pressure change caused by ink supplementation.

The liquid supply channel 201 and/or the liquid return channel 202 are/is provided with a temperature control device 102. The temperature control device 102 is used for adjusting the temperature of the ink in the embodiment, a constant temperature heating device is arranged on the liquid supply channel 201; the liquid return channel 202 is provided with a heater, and the heater is matched with a cooling fan. In the using process, the heater heats the ink through the feedback of the temperature detection points arranged at a plurality of positions, and the heated ink is reduced in temperature by the original ink in the ink accommodating cavity 110 after entering the ink accommodating cavity 110, so that the liquid supply channel 201 needs to be further adjusted in temperature through the constant temperature heating device again, and the ink entering the ink gun 001 is ensured to reach the designated temperature.

The ink containing cavity 110 is also internally provided with a filter device 103, and the liquid return channel 202 is communicated with the interior of the ink containing cavity 110 through the filter device 103. The filtering device 103 is used for filtering precipitates and impurities in the ink; in this embodiment, the filter device 103 is a one-way conductive material, the lower opening of the filter device is communicated with the bottom surface of the ink containing cavity 110, and the liquid return channel 202 is communicated with the ink containing cavity 110 through the filter device 103 in one way. When the ink tank is used, after ink is heated, part of precipitates caused by low temperature are dissolved and enter the ink accommodating cavity 110 through the filtering device 103, so that the influence caused by temperature is eliminated, and the filtering and separation of real precipitates and useless impurities are realized.

The ink circulation system further comprises an ink box 130, and the ink box 130 is communicated with the ink guide cavity 120 through an ink replenishing channel. The ink cartridge 130 is used to supplement the total amount of ink flowing in the ink circulation branch; in this embodiment, the ink replenishing channel is a PVC pipe, and extends to the bottom of the ink guiding chamber 120 after entering the ink guiding chamber 120, and the opening of the PVC pipe is located below the liquid level of the ink. In the using process, when the liquid level detector 101 drops to a set point, the ink replenishing channel is communicated with the ink box 130 and the ink guide cavity 120, under the action of negative pressure, ink in the ink box 130 quickly enters the ink guide cavity 120 until the liquid level detector 101 rises to a specified point, then the ink replenishing channel is closed, and the ink replenishing is completed.

The joint of the ink replenishing channel and the ink box 130 is provided with a connector 131, the connector 131 comprises a connection driving device and a contact detection device, and the connector 131 is connected with the liquid level detector 101. The connector 131 is used for controlling the on-off of the ink box 130 and the ink replenishing channel, the connection driving device is used for driving the ink replenishing channel to be connected with the ink box 130 and controlling the communication and the closing of the ink replenishing channel and the ink guide cavity 120, and the contact detection device is used for detecting the position between the ink box 130 and the ink replenishing channel; in this embodiment, the ink cartridge 130 is inserted into the connector 131 in the lateral direction. When the ink replenishing device is used, the ink box 130 is installed at a preset position, when ink replenishing is needed, the motor drives the ink replenishing channel to be connected with the ink box 130, after the detection device detects that the ink box 130 is connected with the contact, the ink replenishing channel is completely connected with the ink replenishing channel, and the ink replenishing channel is opened.

The ink cartridge 130 is located above the ink containing chamber 110, and the ink guiding chamber 120 is located below the ink containing chamber 110. The position of the ink cartridge 130 defines the speed at which the ink can be replenished by the action of gravity. In this embodiment, the ink cartridges 130, the ink accommodating chambers 110, and the ink guiding chambers 120 are vertically arranged from top to bottom, six ink circulation branches are transversely and regularly arranged, and a heat sink for dissipating heat of the temperature control device 102 is disposed on the back side.

The ink containing cavity 110 is provided with a first ink containing area 111 and a space 112 above the first ink containing area 111, and a liquid supply channel 201 and a liquid return channel 202 are communicated with the first ink containing area 111. The first ink containing section 111 is used for storing ink, and the empty section 112 is an air zone; in this embodiment, the communication ports of the liquid return channel 202, the liquid supply channel 201 and the ink containing cavity 110 are located at the bottom of the ink containing cavity 110.

The ink guide cavity 120 is provided with a second ink containing interval 121 and a pressure regulating interval 122 positioned above the second ink containing interval 121; the pressure control assembly 300 is communicated with the pressure regulating section 122; the liquid return passage 202 communicates with the second ink containing section 121. The second ink containing area 121 is used for storing ink, the pressure regulating area 122 is an air area and is used for regulating the pressure in the ink guide cavity 120, and the pressure control assembly 300 forms different pressures by controlling the air in the air area, so as to regulate the flow rate of the ink circulation branch; in this embodiment, the return channel and the fluid infusion channel 203 enter from the upper part of the ink guide cavity 120 in the form of a pipeline, extend into the ink containing cavity 110 and keep below the liquid level, and have downward openings; the communicating port of the backflow channel and the ink guide cavity 120 is positioned at the bottom of the ink guide cavity 120; the opening of the pressure control assembly 300 communicating with the ink guide chamber 120 is located at the upper portion of the ink guide chamber 120.

The pressure control assembly 300 includes a normal pressure passage 301 and a negative pressure passage 302, the normal pressure passage 301 is connected to the ink containing chamber 110, and the negative pressure passage 302 is connected to the ink guide chamber 120. The normal pressure channel 301 is used for applying gas to the ink containing cavity 110 to enable the ink containing cavity 110 to be in a normal pressure state, and the negative pressure channel 302 is used for extracting the gas in the ink guide cavity 120 to enable the ink guide cavity 120 to be in a negative pressure state; in this embodiment, when the inkjet head 001 discharges ink and is cleaned, the normal pressure channel 301 is connected to the ink accommodating chamber 110, so that the negative pressure in the ink accommodating chamber 110 is eliminated, the ink circulating through the inkjet head 001 loses power and flows out along the inkjet head 001 under the action of gravity, and when the normal pressure channel 301 is closed again, the ink guide chamber 120 generates a negative pressure again, and the ink continues to circulate.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.

Claims

1. An ink circulation system for an industrial printer, comprising: the ink jet head comprises an ink jet head and an ink circulation branch connected with the ink jet head, wherein the ink circulation branch comprises:

the ink containing cavity is communicated with the ink gun through a liquid supply channel;

one end of the ink guide cavity is communicated with the ink gun, and the other end of the ink guide cavity is communicated with the liquid supply channel;

the liquid return channel is connected with the ink accommodating cavity and the ink guide cavity;

the ink circulation system further includes:

and the pressure control assembly is respectively connected with the ink guide cavity and the ink containing cavity.

2. The ink circulation system of an industrial printer according to claim 1, wherein a liquid level detector is arranged in the ink containing cavity and/or the ink guide cavity.

3. The ink circulation system of an industrial printer according to claim 1, wherein the liquid supply channel and/or the liquid return channel is provided with a temperature control device.

4. The ink circulation system of an industrial printer according to claim 1, wherein the ink chamber further comprises a filter device, and the liquid return channel is communicated with the inside of the ink chamber through the filter device.

5. The ink circulation system of the industrial printer according to claim 1, further comprising an ink cartridge communicating with the ink guide chamber through an ink replenishment passage.

6. The ink circulation system of an industrial printer according to claim 5, wherein a connector is provided at a connection point of the ink replenishing channel and the ink cartridge, the connector includes a connection driving device and a contact detecting device, and the connector is connected to the liquid level detector.

7. The ink circulation system of an industrial printer according to claim 5, wherein the ink cartridge is located above the ink containing chamber, and the ink guide chamber is located below the ink containing chamber.

8. The ink circulation system of an industrial printer according to any one of claims 1 to 7, wherein the ink containing chamber is provided with a first ink containing section and a space section above the first ink containing section, and the liquid supply channel and the liquid return channel are communicated with the first ink containing section. .

9. The ink circulation system of the industrial printer according to any one of claims 1 to 7, wherein the ink guide chamber is provided with a second ink containing area and a pressure regulating area above the second ink containing area; the pressure control assembly is communicated with the pressure regulating section; the liquid return channel is communicated with the second ink containing area.

10. The ink circulation system of an industrial printer according to any one of claims 1 to 7, wherein the pressure control assembly comprises a normal pressure passage and a negative pressure passage, the normal pressure passage is connected to the ink containing chamber, and the negative pressure passage is connected to the ink guide chamber.