CN114905656B - A circulating calendering granulation device - Google Patents

Abstract

The invention belongs to the technical field of mechanical equipment, and particularly relates to a circulating calendaring granulation device, wherein an automatic feeding unit primarily processes materials through a material pouring screw and a material conveying screw, the calendaring granulation unit calendars and granulates the materials, an automatic discharging unit sends the granular materials into a mixing and conveying unit, the mixing and conveying unit sends the granular materials into the automatic feeding unit again for circulating granulation, in the process, a spray cooling unit cools or reduces the pressure, cleans residual materials, keeps smooth, can automatically convey propellant materials, carries out repeated circulating granulation at different roller gaps and rotating speeds, and can be used for researching the dehydration effect and the mixing effect of different materials at different process temperatures, roller gaps, roller rotating speeds and roller surface combinations; the rolling granulation unit is simple in structure and reliable in performance, is changed into a split type matching mode from an integrated type, adopts a double-side driving mode, ensures the operation safety, and improves the transmission efficiency.

Description

A circulating calendering granulation device

Technical field:

The invention belongs to the technical field of mechanical equipment, and in particular relates to a cyclic calendering granulation device, which can automatically convey propellant materials and perform multiple cyclic granulation at different roller gaps and rotation speeds.

Background technique:

A calender is a machine that presses and extends objects. It presses and extends the objects into films of a certain thickness and surface through calender rollers and temperature devices. According to the heating method, it is divided into cold pressing and hot pressing. Cold pressing is suitable for materials that do not require heating, such as graphite film, graphite sheet, absorbing material, shielding material, magnetic material, non-ferrous metal material, etc.; hot pressing is divided into water heating, electric heating, oil heating and electromagnetic heating, which are suitable for materials that do not require heating, such as rubber, silicone, silicone rubber, phase change material, PTFE or plastic, etc. According to the number of rollers, it can be divided into two-roller, three-roller, four-roller and five-roller calenders, etc. According to the arrangement of the rollers, it can be divided into "L" type, "T" type, "F" type, "Z" type and "S" type, etc. The driving system of the traditional calender is unstable and it is difficult to achieve free pitch adjustment; the temperature, speed and roller gap of the calendering double rollers cannot be adjusted in real time. During use, the slow heating, asynchronous speed and slow feedback of the pitch adjustment complicate the operation process, resulting in large errors and defects in the subsequent granulation effect, and also bringing great safety hazards to the operators.

A granulator is a molding machine that can make materials into specific shapes. It basically uses a screw or twin-screw extruder to extrude the material, and then cools and cuts it into segments. After the material is extruded, the strip material needs to be transported and cooled over a long distance, resulting in a large space occupation of the entire equipment production line and low production efficiency. In addition, most granulating devices require manual feeding, feeding, and collecting of materials, and the working device is difficult to clean, resulting in high local granulation pressure, shortening the service life of the equipment, and the residual material is difficult to recycle.

The calendering granulation device in the prior art cannot effectively combine the granulator and the calender for use, which increases the complexity of the process, cannot achieve continuous mixing, the mixing granulation effect is difficult to control, and cannot meet the mixed granulation requirements of powder and granular materials. Frequent replacement of the calendering granulation device will cause great cost consumption, repeated mixing of powder and granular materials, and great safety hazards when processing certain materials with high hazard levels; for example, a calendering granulator disclosed in Chinese Patent 202011234307.X includes a frame, and a rolling mechanism is arranged on the frame, and the rolling mechanism includes a first extrusion roller and a second extrusion roller. Two extrusion rollers, wherein the roller surface of the first extrusion roller is uniformly distributed with a plurality of first extrusion grooves, each of which extends along the axial length direction of the roller surface and penetrates through the two end surfaces of the roller surface; a forming ring is also respectively arranged on the two end surfaces of the first extrusion roller, and a discharge hole is arranged on the forming ring, and the discharge hole is connected with the first extrusion groove; the roller surface of the second extrusion roller is uniformly distributed with a plurality of second extrusion grooves, each of which is distributed along the axial length direction of the roller surface, and both ends of the second extrusion groove are blocked, and a cutting mechanism is arranged at the discharge hole of the forming ring; the first The cross section of the first extrusion groove is U-shaped, and the cross section of the second extrusion groove is a triangular structure; the first extrusion roller and the second extrusion roller are both heatable structures; the cutting mechanism includes a knife frame and a blade, the blade is arranged on the knife frame, and the blade is driven to rotate by a blade driving mechanism; one end of the knife frame is connected to the frame and can rotate around its connecting part, and a limiting mechanism for limiting the rotation angle of the knife frame is also arranged on the frame; a tension spring is also arranged on the knife frame and connected to the frame; the distance between the blade of the cutting mechanism and the end face of the forming ring is 1-3mm; a guide trough is arranged below each cutting mechanism, wherein the discharge port of one guide trough is connected to the conveyor belt through a vibrating guide trough, and the discharge port of the other guide trough is directly connected to the conveyor belt; the second extrusion roller is mounted on the second bearing seat, and the second bearing seat is a movable mechanism; a driving mechanism is arranged on the frame, and the driving mechanism is connected to the second bearing seat to drive the second bearing seat to translate along the frame; a guide roller is arranged between the bottom of the second bearing seat and the frame, and a displacement sensor is arranged on the second bearing seat. It has a single function and a low degree of automation, which greatly reduces the granulation efficiency.

Therefore, a new type of circulating calendering granulation device is developed and designed to improve the automation degree and production efficiency of screw-pressed propellant material granulation, meet the needs of industrialization, and have positive social and economic benefits.

Summary of the invention:

The purpose of the present invention is to overcome the shortcomings of the prior art, seek to design a cyclic calendering granulation device, realize the automatic transportation and cyclic granulation of propellant materials, and study the dehydration effect and mixing effect of different materials.

The main structure of a circulating calendering granulation device involved in the present invention includes an automatic feeding unit constituting a circulating system and a calendering granulation unit arranged below it, an automatic discharging unit connected to the calendering granulation unit, and a mixing and conveying unit connecting the automatic discharging unit with the automatic feeding unit.

The automatic feeding unit involved in the invention is provided with a spray cooling unit.

The main structure of the automatic feeding unit of the present invention comprises a hopper, a material dumping screw, a material feeding screw, a coupling, a material changing plate, a material changing motor, a material blocking plate and a material blocking motor; a material dumping screw is arranged in the hopper, the material dumping screw is connected to the pneumatic motor, a material feeding screw is arranged below the hopper, one end of the material feeding screw is connected to the coupling, a material changing plate driven by the material changing motor is arranged above the other end of the material feeding screw, and a material blocking plate driven by the material blocking motor is arranged below; the hopper is divided into a left hopper and a right hopper by a partition, the pneumatic motor is arranged on a support frame fixed on the hopper, and the support frame is also provided with a material feeding screw. A feeding port is provided above the hopper, and the left hopper and the right hopper are respectively connected to the left lower material channel and the right lower material channel through a support plate, and the left lower material channel and the right lower material channel are respectively connected to the left lower material port and the right lower material port opened on the feeding screw housing, and the feeding screw housing is provided on a fixed plate through a support seat, and a feeding screw is provided in the feeding screw housing, and the feeding screw is connected to a coupling through a transmission shaft, and a material changing port is provided above the other end of the feeding screw, and a material discharging port is provided below, a material changing plate is provided at the material changing port, and the material discharging port is connected to a discharging pipe, and a material baffle plate is provided in the discharging pipe.

The main structure of the calendering granulation unit involved in the present invention comprises a front roller, a rear roller, a roller end coupling, a motor end coupling, a motor, a motor moving plate, a core shaft, a granulation disc group, a rotating shaft, a mold tensioning mechanism and a cutter; the front roller and the rear roller are respectively connected to the roller end coupling, the roller end coupling is connected to the motor end coupling, the motor end coupling is connected to the motor, and a motor moving plate is arranged below the motor at one end of the rear roller; the front roller and the rear roller are both provided with a core shaft inside, and a rotating joint is arranged inside the core shaft; the granulation disc group is arranged outside the front roller and the rear roller, and the rotating shaft is symmetrically arranged at both ends of the rear roller, and the mold tensioning mechanism is arranged on the periphery of the rotating shaft, and the cutter is fixed to the end of the rotating shaft; the front roller and the rear roller that are meshed with each other are arranged on the base, and the front roller The front and rear rollers are connected to the roller end couplings through servo hydraulic cylinders respectively, the roller end couplings are connected to the motor end couplings through torque sensors, the motor end couplings are connected to the motors through reducers, the torque sensors, reducers and motors are all fixed on the mounting plate, a motor moving plate is provided below the mounting plate at one end of the rear roller, and a number of sliders are provided at the bottom of the motor moving plate; the mandrel is fixed to the base by bearings and sealed by sealing rings, and the rotary joint is composed of a spring, a reducing right-angle joint and an inner joint; the granulating disc group is composed of split-type drilling discs provided at both ends of the front roller and split-type pressing discs provided at both ends of the rear roller, rotating shafts are symmetrically provided at both ends of the pressing discs, thrust bearings are provided on the end faces of the mold tensioning mechanism, and the cutter is fixed to the end of the rotating shaft by screws.

The main structure of the automatic discharging unit involved in the present invention comprises a discharging slideway and a pneumatic vibration motor connected thereto via a tension spring.

The main structure of the mixing and conveying unit involved in the present invention includes a receiving hopper and a separator connected thereto; the receiving hopper is connected to a receiving plate, the receiving hopper is connected to the separator through a conveying pipe, the separator is fixed on a mounting frame arranged on the hopper, and a feeding pipe connected to the separator extends into the hopper.

The spray cooling unit disclosed by the invention is arranged on a fixed plate and is composed of a spray pipeline and a spray head.

The temperature of the front roller and the rear roller involved in the present invention is controlled by a dual-channel mold temperature controller, the power of the mold temperature controller is 13.5kW, and it can reach the preset temperature within 30 minutes. A drilling-type strong pressure circulation heating/cooling mode is adopted, and each channel is independently controlled, so that the temperature of the front roller and the rear roller can be adjusted more accurately. The drilling-type strong pressure circulation heating/cooling has a larger area than the hollow circulation cooling. The drilling-type strong pressure circulation heating/cooling is a single-channel type, and pressure can be added to promote the circulation of water to achieve efficient heating/cooling. At the same time, due to the addition of water pressure, the water flow retention time is short, and the feedback on the temperature is more accurate. The hollow circulation cooling adopts a spraying or immersion method, which is related to the rotation speed. The gap between the front roller and the rear roller is detected by a displacement sensor located on the piston rod of the servo hydraulic cylinder. The displacement sensor is rigidly connected to the piston rod, and the position detection is more accurate. Both ends of the front roller and the rear roller are provided with online infrared short-wave temperature sensors, which issue a safety alarm in the case of over-temperature to warn the operator in time.

When the circulating calendering granulation device disclosed by the present invention is used, the material is added to the double-station hopper through the feeding port, and the pneumatic motor drives the unloading screw to unload the material; the material changing plate driven by the material changing motor moves left and right to separate the powder and granular materials, and the feeding screw rotates to transport the material to the discharge pipe, and then enters between the front roller and the rear roller, and the front roller and the rear roller drive the material to move so that it is dispersed into the granulation disc group, and granulation is performed by the cutter to form granular materials; the granular materials enter the receiving hopper through the discharge chute, and the granular materials are sent to the separator by the pneumatic conveying vacuum feeder to complete the first granulation process, and then enter the hopper again for circulating granulation; in this process, the spray cooling unit is automatically opened when the calendering granulation unit has dangerous conditions such as over-temperature or over-pressure, and the temperature or pressure is reduced. At this time, the front roller and the rear roller are ejected, and after the circulating granulation is completed, the spray cooling unit is opened to clean the residual materials to keep it unobstructed.

Compared with the prior art, the automatic feeding unit of the present invention performs preliminary processing on the material through the unloading screw and the feeding screw, the calendering granulation unit performs calendering granulation on the material, the automatic discharging unit sends the granular material into the mixing and conveying unit, and the mixing and conveying unit sends the granular material back to the automatic feeding unit for cyclic granulation. During this process, the spray cooling unit performs temperature reduction or pressure reduction, cleans the residual material, and keeps it unobstructed. The propellant material can be automatically conveyed, and multiple cyclic granulation is performed at different roller gaps and rotation speeds. The present invention can be used to study the dehydration effect and mixing effect of different materials under different process temperatures, roller gaps, roller rotation speeds and roller surface combinations. The structure is simple and the performance is reliable. The calendering granulation unit is changed from an integrated type to a split type, and a double-sided drive mode is adopted to ensure the safety of operation and improve the transmission efficiency. The present invention provides technical support for studying the dehydration effect and mixing effect of different materials under different process temperatures, roller gaps, roller rotation speeds and roller surface combinations, and has far-reaching practical significance.

Description of the drawings:

FIG1 is a schematic diagram of the main structure of the present invention.

FIG. 2 is a schematic structural diagram of the automatic feeding unit according to the present invention.

FIG. 3 is a schematic diagram of a partial structure of the automatic feeding unit according to the present invention.

FIG. 4 is a schematic structural diagram of a calendering granulation unit according to the present invention.

FIG. 5 is a schematic diagram of the top view of the calendering granulation unit according to the present invention.

FIG. 6 is a schematic diagram of the partial structure of the calendering granulation unit involved in the present invention.

FIG. 7 is a schematic diagram showing the principle of the drilling-type strong-pressurization circulation heating/cooling mode of the present invention.

Detailed ways:

The present invention will be further described below by way of embodiments in conjunction with the accompanying drawings.

Embodiment 1:

The main structure of the circulating calendering granulation device involved in this embodiment includes an automatic feeding unit 10, a calendering granulation unit 20, an automatic discharging unit 30, a mixing and conveying unit 40 and a spray cooling unit 50; the calendering granulation unit 20 is arranged below the automatic feeding unit 10, the calendering granulation unit 20 is connected to the automatic discharging unit 30, and the automatic discharging unit 30 is connected to the automatic feeding unit 10 through the mixing and conveying unit 40, so as to form a circulation system; the automatic feeding unit 10 is also provided with a spray cooling unit 50; the main structure of the automatic feeding unit 10 includes a hopper 101, a partition 102, a left hopper 103, a right hopper 104, a pouring screw 105 , pneumatic motor 106, support frame 107, feeding port 108, support plate 109, left lower material channel 110, right lower material channel 111, feeding screw housing 112, left lower material port 113, right lower material port 114, support seat 115, fixing plate 116, feeding screw 117, transmission shaft 118, coupling 119, material changing port 120, material discharging port 121, material changing plate 122, material changing motor 123, material discharging pipe 124, material blocking plate 125 and material blocking motor 126; hopper 101 is divided into left hopper 103 and right hopper 104 by partition 102, and both left hopper 103 and right hopper 104 are provided with pouring screw 105, and pouring screw 105 is connected to the pneumatic motor 106, and the pneumatic motor 106 is arranged on a support frame 107 fixed on the hopper 101, and the support frame 107 is also provided with a feeding port 108 located above the hopper 101; the left hopper 103 and the right hopper 104 are respectively connected to the left lower material channel 110 and the right lower material channel 111 through the support plate 109, and the left lower material channel 110 and the right lower material channel 111 are respectively connected to the left lower material port 113 and the right lower material port 114 opened on the feeding screw housing 112, and the feeding screw housing 112 is arranged on the fixed plate 116 through the support seat 115, and the feeding screw housing 112 is provided with a feeding screw 117, and the feeding screw 117 is provided with a feeding screw 117. One end is connected to the coupling 119 through a transmission shaft 118, and a material changing port 120 is arranged above the other end of the feeding screw 117, and a material discharging port 121 is arranged below. A material changing plate 122 is arranged at the material changing port 120, and the material changing plate 122 is driven by a material changing motor 123. The material discharging port 121 is connected to a material discharging pipe 124, and a material blocking plate 125 is arranged in the material discharging pipe 124, and the material blocking plate 125 is driven by a material blocking motor 126; the main structure of the calendering granulation unit 20 includes a base 201, a front roller 202, a rear roller 203, a servo hydraulic cylinder 204, a roller end coupling 205, a torque sensor 206, a motor end coupling 207, and a reducer 208, motor 209, mounting plate 210, motor moving plate 211, slider 212, mandrel 213, bearing 214, sealing ring 215, spring 216, reducer right angle joint 217, inner joint 218, granulating disc group 219, drilling disc 220, pressing disc 221, rotating shaft 222, mold tensioning mechanism 223, thrust bearing 224, cutter 225 and screw 226; the base 201 is provided with a front roller 202 and a rear roller 203 meshing with each other, the front roller 202 and the rear roller 203 are respectively connected to the roller end coupling 205 through the servo hydraulic cylinder 204, and the roller end coupling 205 is connected to the roller end coupling 205 through the torque sensor The torque sensor 206 is connected to the motor end coupling 207, and the motor end coupling 207 is connected to the motor 209 through the reducer 208. The torque sensor 206, the reducer 208 and the motor 209 are all fixed on the mounting plate 210. A motor moving plate 211 is arranged below the mounting plate 210 at one end of the rear roller 203, and a plurality of sliders 212 are arranged at the bottom of the motor moving plate 211; the front roller 202 and the rear roller 203 are both provided with a core shaft 213 inside, and the core shaft 213 is fixed to the base 201 by a bearing 214 and sealed by a sealing ring 215. The core shaft 213 is provided with a spring 216, a reducer right angle joint 217 and an inner joint 218. 18; a granulating disc group 219 is arranged outside the front roller 202 and the rear roller 203, and the granulating disc group 219 is composed of a split drilling disc 220 arranged at both ends of the front roller 202 and a split pressing disc 221 arranged at both ends of the rear roller 203, and a rotating shaft 222 is symmetrically arranged at both ends of the pressing disc 221, and a mold tensioning mechanism 223 is arranged on the periphery of the rotating shaft 222, and a thrust bearing 224 is arranged on the end face of the mold tensioning mechanism 223, and a cutter 225 is fixed to the end of the rotating shaft 222 by a screw 226; the main structure of the automatic discharging unit 30 includes a discharging slide 301 and a pneumatic vibration motor 30 2. The discharge chute 301 is connected to the pneumatic vibration motor 302 through a tension spring 303; the main structure of the mixing and conveying unit 40 includes a receiving tray 401, a receiving hopper 402, a conveying pipe 403, a separator 404, a mounting frame 405 and a feeding pipe 406; the receiving tray 401 is connected to the receiving hopper 402, the receiving hopper 402 is connected to the separator 404 through the conveying pipe 403, the separator 404 is fixed on the mounting frame 405 set on the hopper 101, and the feeding pipe 406 connected to the separator 404 extends into the hopper 101; the spray cooling unit 50 is set on the fixed plate 116, and consists of a spray pipe 501 and a spray head 502.

An arch-breaking device is provided between the pneumatic motor 104 and the feeding screw 105 involved in this embodiment to prevent material bridging; the feeding screw housing 112 is a transparent shell, which is convenient for real-time observation of the material residue and timely and correct treatment; the feeding screw 117 is a coreless spiral feeding screw, which can prevent the feeding screw housing 112 from being damaged; the material of the discharge pipe 124 is made of stainless steel, and a small hole is opened on it. After the material is transported, a blowing device is used to blow the residual material in the discharge pipe 124 through the small hole; the front roller 202 is a working roller with 24 arc grooves on the surface, and the rear roller 203 is a working roller with 36 triangular grooves on the surface. The idle rollers with shaped grooves, the diameters, lengths and aspect ratios of the front roller 202 and the rear roller 203 are the same, which are 110mm, 220mm and 2:1 respectively. The driving mode of the front roller 202 and the rear roller 203 is dual servo motor drive to adjust the speed. One roller is driven by a servo motor. The dual servo motors are equipped with a same-speed adjustment module to perform precise same-speed control to ensure the synchronization of the speeds of the front roller 202 and the rear roller 203. When performing stepless differential speed regulation, the servo motor is controlled separately; the servo hydraulic cylinder 204 has a BT4 explosion-proof grade, has the functions of constant pressure rubber mixing and system safe opening, and the hydraulic oil adopts explosion-proof and flame-retardant hydraulic Oil is used to prevent danger from happening. The distance between the front roller 202 and the rear roller 203 is adjusted by hydraulic distance adjustment. The front roller 202 is fixed, and the rear roller 203 is flexibly moved by the motor moving plate 211 and the slider 212. The distance adjustment is made by walking, and the feedback of the distance adjustment is fast and accurate. The torque sensor 206 is an online torque sensor, which displays the torque size in real time. The reducer 208 has a locking function, which can directly brake and lock when danger occurs. The motor 209 is a servo motor, which is equipped with a locking device to prevent accidents caused by inertia during emergency stop. The diameter of the granulation hole of the granulation disc group 219 is 6mm, and the number of granulation holes is 48/week, which is easy to disassemble and easy to use. Replacement can reduce material residue and facilitate cleaning. The self-pressing of the rear roller 203 provides granulation power, and different specifications of granulation diameters can be replaced for experiments or production. The replacement is quick. The calendering granulation working area is provided with a triangular release area to reduce material pressure so that the material can be extruded more evenly from the granulation port; the mold tensioning mechanism 223 can prevent interference from the cutter 225; the thrust bearing 224 adopts a double skeleton oil seal to prevent material dust from entering the groove of the thrust bearing 224, which can reduce the resistance caused by the tensioning force; the receiving plate 401 is provided with small holes for water diversion; the conveying pipe 403 is a transparent hose to prevent the generation of static electricity.

When the cyclic calendering granulation device involved in this embodiment is used, the material is added to the double-station hopper 101 through the feeding port 108 to achieve the separation of powder and granular materials and prevent repeated mixing of materials. The pneumatic motor 104 drives the unloading screw 105 to enter the left lower material channel 110 or the right lower material channel 111 to unload the material; the material changing plate 122 driven by the material changing motor 123 moves left and right, so that the left lower material port 113 and the right lower material port 114 are opened and closed, and the powder and granular materials are separated. The feeding screw 117 rotates to transport the material to the discharge port 121, and the residual situation of the material is observed through the feeding screw housing 112 made of transparent material. When dangerous situations such as mixed accumulation occur, the blocking motor 123 drives the blocking plate 125 to move, close the discharge pipe 124, and increase the safety of operation; the material reaches the front roller through the discharge pipe 124 Between the drum 202 and the rear roller 203, the roller end coupling 205 cooperates with the motor end coupling 207 to output power dynamically and stably. The front roller 202 and the rear roller 203 drive the material to move and disperse it into the granulation disc group 219, and granulate it through the cutter 225 to form granular material; after the granular material reaches the discharge chute 301, the pneumatic vibration motor 302 pulls the tension spring 303 to vibrate the discharge chute 301. Under the action of vibration, the granular material overcomes the resistance of water and enters the receiving hopper 402. The leaked material falls into the receiving disc 401. The granular material in the receiving hopper 402 is sent to the separator 404 through the conveying pipe 403 by the pneumatic conveying vacuum feeder to complete the first granulation process, and then enters the hopper 101 again through the feeding pipe 406 for cyclic granulation.

Claims (8)

1. The main structure of the automatic feeding unit comprises a hopper, a material pouring screw, a material conveying screw, a coupler, a material changing plate, a material changing motor, a material blocking plate and a material blocking motor; a material pouring screw rod is arranged in the hopper and is connected with the pneumatic motor, a material conveying screw rod is arranged below the hopper, one end of the material conveying screw rod is connected with the coupler, a material changing plate driven by the material changing motor is arranged above the other end of the material conveying screw rod, a material blocking plate driven by the material blocking motor is arranged below the material conveying screw rod, and the main structure of the calendaring granulation unit comprises a front roller, a rear roller, a roller end coupler, a motor moving plate, a mandrel, a granulation disc group, a rotating shaft, a die tensioning mechanism and a cutter; the front roller and the rear roller are respectively connected with a roller end coupler, the roller end coupler is connected with a motor end coupler, the motor end coupler is connected with a motor, and a motor moving plate is arranged below the motor at one end of the rear roller; the inner parts of the front roller and the rear roller are respectively provided with a mandrel, and a rotary joint is arranged in the mandrels; the outside of preceding roller and back roller is provided with granulation disc group, and the both ends symmetry department of back roller is provided with the rotation axis, and the periphery of rotation axis is provided with mould tensioning mechanism, and the cutter is fixed at the tip of rotation axis.

2. The circulation calendaring granulation device according to claim 1, wherein the hopper is divided into a left hopper and a right hopper by a partition plate, the pneumatic motor is arranged on a support frame fixed on the hopper, a feed inlet positioned above the hopper is further arranged on the support frame, the left hopper and the right hopper are respectively connected with a left feed channel and a right feed channel through support plates, the left feed channel and the right feed channel are respectively connected with a left feed channel and a right feed channel which are respectively arranged on a feed screw shell, the feed screw shell is arranged on a fixed plate through a support seat, the spray cooling unit is also arranged on the fixed plate, a feed screw is arranged in the feed screw shell, the feed screw is connected with a coupling through a transmission shaft, a feed inlet is arranged above the other end of the feed screw, a discharge outlet is arranged below the feed screw, a feed plate is arranged at the feed inlet, the discharge outlet is connected with a discharge pipeline, and a baffle plate is arranged in the discharge pipeline.

3. The circulation calendaring granulation device according to claim 2, wherein the front roller and the rear roller which are meshed with each other are arranged on the base, the front roller and the rear roller are respectively connected with a roller end coupler through a servo hydraulic cylinder, the roller end coupler is connected with a motor end coupler through a torque sensor, the motor end coupler is connected with a motor through a speed reducer, the torque sensor, the speed reducer and the motor are all fixed on a mounting plate, a motor moving plate is arranged below the mounting plate at one end of the rear roller, and a plurality of sliding blocks are arranged at the bottom of the motor moving plate; the mandrel is fixed on the base through a bearing, and is sealed through a sealing ring, and the rotary joint consists of a spring, a reducing right-angle joint and an inner joint; the granulating disc group consists of a split drilling disc arranged at two ends of the front roller and a split pressing disc arranged at two ends of the rear roller, rotating shafts are arranged at symmetrical positions of two ends of the pressing disc, thrust bearings are arranged on end faces of the die tensioning mechanism, and a cutter is fixed at the end parts of the rotating shafts through screws.

4. A circulation calendaring granulation apparatus according to claim 3, characterised in that the main body structure of the automatic discharging unit comprises a discharging slideway and a pneumatic vibration motor connected thereto by a tension spring.

5. The circulation calendering and granulating apparatus according to claim 4, wherein the main structure of the mixing and conveying unit includes a receiving hopper and a separator connected thereto.

6. The circulation calendering and granulating device according to claim 5, wherein the receiving hopper is connected with the receiving tray, the receiving hopper is connected with the separator through a conveying pipeline, the separator is fixed on a mounting frame arranged on the hopper, and a feeding pipeline connected with the separator extends into the hopper.

7. The circulation calendering granulation device according to claim 3, wherein the temperatures of the front roller and the rear roller are controlled by a two-channel die temperature machine, the power of the die temperature machine is 13.5kW, the preset temperature can be reached within 30min, a drilling type strong pressurizing circulation heating/cooling mode is adopted, each channel is independently controlled, the temperatures of the front roller and the rear roller are regulated, the drilling type strong pressurizing circulation heating/cooling is single-channel type, and the heating/cooling is realized by adding pressure and pushing water circulation; the gap between the front roller and the rear roller is detected by a displacement sensor positioned on a piston rod of the servo hydraulic cylinder, and the displacement sensor is rigidly connected with the piston rod, so that the position detection is facilitated; both ends of the front roller and the rear roller are provided with on-line infrared short wave temperature sensors, so that safety alarm can be carried out under the condition of overtemperature.

8. The circulating calendaring granulation apparatus according to claim 6, wherein in use, material is added into the duplex hopper through the feed port, and the pneumatic motor drives the material pouring screw to pour material; the material changing plate driven by the material changing motor moves left and right to separate powder materials, the material conveying screw rotates to convey the materials to the discharging pipeline, the materials enter between the front roller and the rear roller, the front roller and the rear roller drive the materials to move so as to be dispersed into the granulating disc group, and the materials are granulated by the cutter to form granular materials; the granular materials enter a receiving hopper through a discharging slideway, and enter the hopper again after the granular materials are sent into a separator to complete the first granulation process through a pneumatic conveying vacuum feeder for cyclic granulation; in the process, the spray cooling unit is automatically started when the calendaring and granulating unit has a dangerous condition of overtemperature or overpressure, and is cooled or depressurized, at the moment, the front roller and the rear roller are sprung, and after the cyclic granulation is finished, the spray cooling unit is started to clean residual materials so as to keep smooth.