JPH11239972A - Concentration control device in liquid honing device to project ice - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously supply ice slurry by stably holding the concentration of the ice slurry in a constant range, by arranging a light quantity discriminating sensor light projector and a light receiver in response to a transparent conduit to reflux the ice slurry, and connecting them to an ice slurry concentration setting unit in which the concentration is set. SOLUTION: Ice slurry is always refluxed by a transparent conduit 17 by a pump 16. The projecting light from a light quantity discriminating sensor light projector 20 is converted into an electric signal by receiving the light by a light receiver 21, and a measured value of the converted ice slurry concentration is sent to an ice slurry concentration setting unit 22 to be compared with a preset value of the ice slurry concentration setting unit 22. When the measured value is lower than the preset value as a result of this comparison, a signal is sent to an ice grain manufacturing device 7 to be operated, an ice grain is discharged from an ice grain discharge port 12 to be is mixed by agitation of an agitating blade 9 in an agitating mixing device 5, and work is continued up to becoming equal to the preset value. When the measured value is higher than the preset value, cooling water is sent to the agitating mixing device 5 by sending a signal to a pump 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling the concentration of ice slurry in a liquid honing apparatus for projecting ice.

[0002]

2. Description of the Related Art In general, as a blasting material used in a blasting apparatus including a liquid honing, abrasive grains, glass beads, vegetable particles, synthetic resin particles and the like are mainly used. Due to the simplicity of blasting and its ability, its application range is wide for deburring after machining and resin deburring of electronic components. However, there are problems that the shot material may remain on the processed article and that dimensional changes due to blasting, surface damage, and the like cannot be avoided.

In order to solve the above-mentioned problems, a device called ice blast, which directly accelerates and injects ice particles or dry ice particles with a high-pressure gas, has recently been put to practical use. However, in this apparatus, since only ice particles or dry ice particles are jetted, cleaning properties are lacking, and burrs separated from articles may reattach and remain, and post-treatment is required.

Accordingly, the applicant of the present application has previously disclosed in
No. 309660 proposes an apparatus for injecting ice slurry obtained by mixing ice and cooled cooling water with high pressure gas.

[0005]

However, even in the above apparatus, it is difficult to obtain a predetermined concentration stably because it is easily affected by the amount of input ice particles, the amount of input water, the temperature, the external environment and the like. Also, due to the nature of the ice particles, the ice floats up, or pushes against each other and agglomerates to cause clogging of the transport tube, so that it cannot be used continuously and stably. In the present invention, the concentration of the ice slurry is selected and designated, and the measurement and adjustment are automatically performed so as to perform the continuous supply.

[0006]

According to the present invention, there is provided a liquid honing method for mixing ice and cooling water in a stirring and mixing apparatus and projecting ice slurry from an injection nozzle. In the apparatus, a transparent conduit for circulating the ice slurry is connected to the stirring and mixing device, and a light amount discriminating sensor projector and a light receiver are installed corresponding to the conduit, and the ice is connected to the ice slurry concentration setting device whose concentration is set. A slurry concentration control device was constructed.

[0007] An ice slurry concentration setting device is connected to an ice particle producing device and a pump attached to a liquid conduit for supplying cooling water to the stirring and mixing device. , And a light quantity discriminating sensor projector and a photodetector were installed in a closed container at a position facing the conduit to form an ice slurry concentration control device.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to FIG. An injection nozzle 2 is provided in a liquid honing chamber 1, a slurry introduction pipe 3 for introducing ice slurry is provided on one of the injection nozzles 2, and a high-pressure gas introduction pipe 4 is provided on the other. Further, a stirring and mixing device 5 and a liquid storage tank 6 are arranged in the liquid honing chamber 1 side by side, and an ice particle producing device 7 is installed on the liquid storage tank 6.

A stirring blade 9 driven by a motor 8 is provided in the stirring and mixing device 5, and a discharge side of a liquid conduit 11 having a pump 10 provided on the lower surface of the liquid storage tank 6 is communicated with an upper portion of the stirring and mixing device 5. At the very least, a cooling liquid is supplied, and the ice particles discharged from the ice particle outlet 12 of the ice particle producing device 7 and the cooling liquid are mixed by stirring the stirring blades 9 to produce an ice slurry.

An upper limit sensor 13 and a lower limit sensor 14 are installed in the stirring and mixing device 5 to control the supply of liquid and ice particles to purify a suitable ice slurry. 2 to supply the ice slurry.

The stirring and mixing device 5 is provided with a transparent conduit 17 for refluxing the ice slurry by a pump 16.
7 is passed through a sealed container 19 in which a dry gas 18 is sealed, and a light quantity discriminating sensor projector 20 and a light receiver 21 are arranged in the sealed container 19 so that the optical axis is orthogonal to the conduit 17. Is detected, and the ice slurry concentration is sent to the ice slurry concentration setting device 22, and the preset concentration value of the ice slurry and the measured value are compared by a computer (not shown). If the measured value is low, the ice particle producing device 7 is operated, and the
The ice particles are discharged from 2 and stirred by the stirring blade 9 in the stirring and mixing device 5 so that the operation is continued until it becomes equal to the set value.

On the other hand, when the measured value is higher than the set value, the pump 10 is driven to send the cooling water from the liquid storage tank 6 to the stirring and mixing device 5 through the liquid conduit 11, and the operation is continued until the value becomes equal to the set value. I will do it. In the embodiment shown in FIG. 1, the transparent conduit 17 is provided on the lower surface of the stirring and mixing device 5, but it is not necessarily limited to the lower surface because of the presence of the pump 16, and may be provided at another position. It is.

A unit cooler 23 is connected to the liquid storage tank 6 to cool the liquid in the liquid storage tank 6 and supply the cooling liquid to the liquid storage tank. A fresh water supply pipe 25 having a valve 24 is provided above the liquid storage tank 6, and a ball tap 26 is provided inside.

On the other hand, a drain recovery tank 28 is provided below a discharge port 27 provided on the lower surface of the liquid honing chamber 1, and a return conduit 30 having a pump 29 is connected to a storage tank via a strainer 31 for removing impurities. 6 and the drainage liquid is returned to the liquid storage tank 6. In the figure, 32 is a drain, 33 is an ice maker, 34 is an ice storage tank, and this ice storage tank 34 communicates with the ice particle manufacturing apparatus 7 through an ice block input port 35.

The embodiment of the present invention is configured as described above. Chip-shaped or flake-shaped ice particles are produced by the ice particle producing device 7 and supplied to the stirring and mixing device 5 from the ice particle outlet 12. Cooling water is supplied from the liquid storage tank 6 to the stirring and mixing device 5, and the ice particles and the cooling slurry are stirred and mixed by driving the stirring blades 9 to produce an ice slurry.

The ice slurry is constantly circulated by a pump 16 through a transparent conduit 17. Then, the light emitted from the light amount discriminating sensor projector 20 is received by the light receiver 21 and converted into an electric signal, and the measured value of the converted ice slurry concentration is sent to the ice slurry concentration setter 22. Compare with the set value.

When the measured value is lower than the set value, a signal is sent to the ice particle producing device 7 to operate the device, the ice particles are discharged from the ice particle discharge port 12, and the stirring blade 9 is Mix by stirring and continue working until it is equal to the set value.

If the measured value is higher than the set value,
A signal is sent to the pump 10 to send the cooling water to the stirring and mixing device 5 to reduce the concentration until the concentration becomes equal. The blast is performed by projecting the ice slurry from the injection nozzle 2 while keeping the ice slurry concentration constant.

[0019]

As described above, the present invention has the above-described structure and function, and can continuously supply the ice slurry in a constant concentration while keeping the concentration thereof stable. It can demonstrate its ability stably,
If it is used for blasting of a product that does not like the residual projection material or damage to the surface due to the projection material, there is an effect that the workpiece is washed by a synergistic action with the liquid. Further, since the used ice slurry becomes water if it is melted, abrasive grains to be discarded as in conventional blasting are not generated, which is extremely practical.

[0020]

[Brief description of the drawings]

FIG. 1 is a sectional view of an ice slurry concentration control device in a liquid honing device for projecting ice according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid honing chamber 2 Injection nozzle 3 Slurry introduction pipe 4 High-pressure gas introduction pipe 5 Stirring / mixing device 6 Storage tank 7 Ice particle manufacturing device 8 Motor 9 Stirrer blade 10 Pump 11 Liquid conduit 12 Ice particle discharge port 13 Upper limit sensor 14 Lower limit sensor DESCRIPTION OF SYMBOLS 15 Pump 16 Pump 17 Conduit 18 Dry gas 19 Airtight container 20 Light quantity discrimination sensor 21 Light receiver 22 Ice slurry concentration setting unit 23 Unit cooler 24 Valve 25 Water supply pipe 26 Ball tap 27 Outlet 28 Drainage recovery tank 29 Pump 30 Return conduit 31 Strainer 32 Drain 33 Ice maker 34 Water tank 35 Ice block inlet

Claims (3)

[Claims] 1. A liquid honing apparatus for mixing ice and cooling water in a stirring and mixing apparatus and projecting ice slurry from an injection nozzle, wherein a transparent conduit for recirculating the ice slurry to the stirring and mixing apparatus is provided. An ice slurry concentration control device, characterized in that a light quantity discriminating sensor light emitter and a light receiver are connected and connected to a conduit, and connected to an ice slurry concentration setting device for setting the concentration. 2. The concentration control device according to claim 1, wherein the ice slurry concentration setting device is connected to an ice particle production device and a pump attached to a liquid conduit for supplying cooling water to the stirring and mixing device. 3. A light transmitting device according to claim 1, wherein a transparent conduit penetrates through a sealed container in which the dry gas is sealed, and a light amount discriminating sensor projector and a light receiving device are installed in the sealed container at positions opposite to the conduit. Concentration control device.