JP4820145B2 - Ice grain sprayer and method for detecting clogging in funnel of ice grain sprayer - Google Patents

Description

  The present invention relates to an ice blast processing ice particle spray device and a method for detecting clogging in a funnel of an ice particle spray device.

Conventionally, in ice blasting, in which ice particles produced by an inner drum type ice maker are collected in a funnel and sprayed for cleaning and deburring, the inside of the funnel is continuously or intermittently. Some of the fallen ice particles adhere to the funnel wall, and when they accumulate to a certain size, they fall under their own weight.
However, if ice particles deposited at several locations on the wall fall simultaneously, a bridge is formed at the funnel outlet to narrow the outlet, and finally the funnel outlet is blocked to cause clogging.
As a result, it is impossible to inject ice particles onto the workpiece, and the funnel is filled with ice particles and overflows, so detection of clogging has been indispensable. A method for detecting clogging has not been established.

FIG. 5 is a perspective view showing a conventional powder level detector. As shown in FIG. 5, a part of the side surface of the hopper 21 is replaced with a transparent acrylic plate 22, and a light projecting light sensor 23 a and a light receiving light sensor 23 b are provided on both sides of the hopper 21. There is known a powder level detector 20 that detects the powder level depending on whether the powder 24 completely shields the light from 23c or not (see Non-Patent Document 1).
Keyence 2006 General Catalog, P.I. 91 LV (General-purpose digital laser sensor)

However, when this method is adopted for a funnel and part of the funnel wall is replaced with another type of transparent material and is detected by light, a step is formed on the funnel wall to prevent the ice particles from falling down. However, there was a problem that the difference in sliding friction coefficient from the transparent material hindered the fall of ice particles. Furthermore, since the adhering ice particles and melted water are also detected, there is a problem that the reliability is inferior.
In addition, when a thermocouple is installed at the funnel outlet and brought into contact with the ice particles, the responsiveness is poor, and when clogged, it shows the same value as the temperature when ice particles exist due to the cold air that descends from the funnel outlet. There was a problem with reliability.
Furthermore, in the method of detecting the displacement at the time of clogging by installing an ultrasonic displacement sensor in the funnel, it is necessary to install a displacement type directly under the ice making machine. In this case, adjustment and inspection are troublesome, and ice Since it was in an atmosphere in which grains and water droplets dropped, there was a problem that it was easy to break down.

  Therefore, the present invention was devised to solve these problems. The funnel has good responsiveness and is easy to adjust and inspect without causing a part of the funnel wall to be replaced with a transparent material. It is an object of the present invention to provide an ice grain injection device capable of detecting clogging in the interior with high reliability and a method for detecting clogging in a funnel of an ice grain injection device.

The invention according to claim 1 is an ice maker that manufactures ice particles, a large funnel portion that collects ice particles falling from the ice maker, a piping portion that conveys the ice particles collected by the large funnel portion, A small funnel portion formed at the inlet of the piping portion, and a gap provided between the outlet of the large funnel portion and the small funnel portion, and ice particles falling in the gap An optical sensor for irradiating light and detecting the presence or absence of ice particles; and a water injection nozzle for injecting water into the large funnel, and the optical sensor drops the gap during ice making of the ice making machine. If it is detected that there is clogging in the large funnel part without detecting the ice particles to be melted, the ice particles are melted by spraying water into the large funnel part from the nozzle for water injection, and clogging in the large funnel part It is characterized by being configured to eliminate the above .

  The invention according to claim 2 is a method for detecting clogging in a funnel of an ice grain jetting device (10), wherein the ice making machine (1) for producing ice grains and the ice grains falling from the ice making machine (1) are collected. A large funnel portion (2), a piping portion (3) for conveying ice particles collected by the large funnel portion (2), and a small funnel portion (4) formed at the inlet of the piping portion (3) And an optical sensor (5) provided in the vicinity of the outside of the small funnel portion (4) with a gap between the outlet of the large funnel portion (2) and the small funnel portion (4). In the grain injection device (10), a first step of producing ice grains by an ice making machine (1) which is an ice making means provided at the upper part, and an ice grain collecting means disposed at the lower part of the ice making machine (1) A second step in which the large funnel part (2) collects ice particles falling from the ice making machine (1); and from the outlet of the large funnel part (2). A third step of irradiating the falling ice particles with light from the optical sensor (5), and a small funnel portion (4) with a gap provided below the large funnel portion (2) are arranged, and the large funnel portion (2 ) Receives the ice particles that have flowed down from the nozzle and connected to the workpiece via the suction hose portion (4a), and the ice particles are jetted by a high-pressure pump from the nozzle connected to the tip of the suction hose portion (4a). When the optical sensor (5) detects clogging in the large funnel portion (2), the large funnel portion (2) And a sixth step of melting the ice particles by injecting water into the large funnel portion (2) to eliminate clogging in the large funnel portion (2).

  According to the first aspect of the present invention, a gap is provided between the outlet of the large funnel portion and the small funnel portion, and a light sensor is provided near the outside of the small funnel portion to irradiate the falling ice particles with light, By detecting the presence / absence of grains, the ice jet device can detect clogging in the funnel with high responsiveness, easy adjustment and inspection, and failure detection without making a part of the funnel wall transparent. Can be provided.

  According to the invention which concerns on Claim 2, the 1st process which manufactures an ice grain with the ice making machine which is the ice making means provided in the upper part, and the large funnel part which is the ice grain collection means arrange | positioned at the lower part of the ice making machine The second step of collecting ice particles falling from the ice making machine, the third step of irradiating the ice particles falling from the outlet of the large funnel portion with light from the optical sensor, and a small gap at the bottom of the large funnel portion A funnel part is arranged to receive the ice particles flowing down from the large funnel part and transport them to the workpiece via the suction hose part, and the ice particles from the nozzle connected to the tip of the suction hose are high-speed by the high-pressure pump. If the optical sensor detects that there is a clog in the large funnel part, the water is injected into the large funnel part to melt the ice particles. However, the sixth step to eliminate clogging in the large funnel part, Therefore, it is possible to provide an ice droplet jetting device that is highly responsive, can be easily adjusted and inspected without causing a part of the wall surface of the funnel to be transparent, and can detect clogging in the funnel with high reliability. it can.

Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front view of an ice particle spraying device for ice blasting. As shown in FIG. 1, in the ice blasting apparatus 10 using ice blasting according to the present invention, an ice making machine 1 for producing ice grains is an inner drum type ice making machine 1. The ice making machine 1 is placed just above the large funnel portion 2. Further, since the ice particles made by the ice making machine 1 fall at the lower part of the ice making machine 1, a large funnel portion 2 is arranged to collect the ice particles.

  The large funnel portion 2 is formed in a conical shape, the diameter of the opening 2b is, for example, 680 mm, and is formed in a size slightly larger than the drum diameter D of the ice making portion of the ice making machine. In addition, a cylindrical portion 2c having a width of 50 mm is formed on the upper portion of the large funnel portion 2 in a headband shape. In the cylindrical portion 2c, eight water jet nozzles 2d are arranged at eight equal intervals. The water injection nozzle 2d forms an L shape, and one of the L shapes can be directed downward and water can be sprayed downward in a fan shape. Further, a water injection hose 2e is connected to the other of the water injection nozzles 2d. Further, the taper angle of the funnel 4 is about 55 °, and a thin tube outlet 2a is formed at the lower portion with a diameter of 50 mm.

  The piping part 3 conveys the ice particles collected by the large funnel part 2 to a workpiece (not shown). That is, a small funnel portion 4 is formed at the inlet of the piping portion 3, and the small funnel portion 4 receives the ice particles collected by the large funnel portion 2 and transports them to the workpiece via the suction hose portion 4 a.

As shown in FIG. 1, the gap between the outlet 2 a of the large funnel portion 2 and the upper end portion of the small funnel portion 4 is about 10 mm. Is provided, and a reflection plate 5c is provided on the opposite opposite side. The falling ice particles are irradiated with red laser light to detect the presence or absence of ice particles. This optical sensor 5 is a regression laser sensor.
With this regressive laser sensor, laser light is irradiated under the exit of the large funnel to detect the presence or absence of ice particles falling.

2 is a cross-sectional view taken along the line AA shown in FIG. 1, showing the operation of the optical sensor for the regression laser beam. FIG. 2A is a cross-sectional view showing a state in which the clogging in the funnel is detected. It is sectional drawing which shows the state which does not detect clogging in a funnel. As shown in FIG. 2A, when the ice particles are not falling, the laser beam is reflected by the opposing reflector and re-entered to detect clogging in the funnel.
However, this detection operation is performed when an ice making machine that makes ice particles is operated and the ice particles are falling.

In addition, clogging in the funnel occurs as ice particles accumulated near the outlet 2a of the large funnel portion 2 grow and gradually grow. For this reason, since the ice particles falling from the outlet 2a of the large funnel portion 2 gradually decrease, the light reception becomes intermittent and signs of clogging can be detected.
For example, it may be determined as “clogged” when light reception is intermittent and the interval during which light cannot be received extends for 3 minutes, or “clogged” after 5 minutes.

  As shown in FIG. 2B, when the ice particles are falling smoothly, the irradiated laser light is blocked by the ice particles and does not reach the reflector 5c. Further, the laser beam that has passed through the fall of the ice particles is reflected by the reflector 5c, but is again shielded by the ice particles, and the laser beam does not reach the optical sensor 5 and cannot be completely received. Grain fall can be confirmed, and clogging in the funnel is “None”. That is, when irregularly shaped ice particles of about 2 kg / min fall intermittently from the outlet 2a of the large funnel portion 2, the on-delay time of the optical sensor 5 is set to 1 second, so that stable light reception is possible. Since it becomes impossible to detect, clogging in the funnel can be detected.

3 is a cross-sectional view taken along line AA shown in FIG. 1, showing the operation of the optical sensor for the transmissive laser beam. FIG. 3A is a cross-sectional view showing a state where the presence of clogging in the funnel is detected. FIG. 6 is a cross-sectional view showing a state where no funnel clogging is detected.
The difference from FIG. 2 is that of FIG. 2 which is a regression laser light sensor, whereas this is the case of a transmission laser light sensor. The laser beam of the light source is a red laser, has good convergence, and has a small spot diameter of 3 mm, so that the space at the outlet 2a of the large funnel portion 2 (the gap with the small funnel 4) can be as small as 10 mm. Moreover, since it is excellent in straightness, the light projecting light sensor 5a and the light receiving light sensor 5b can be installed at a position about 1 m away from the center of the funnel, and malfunction due to adhesion of ice particles or water droplets can be prevented.

Next, a method for detecting clogging in a funnel of an ice particle spray device will be described with reference to the drawings.
FIG. 4 is a flowchart illustrating a method for detecting clogging in a funnel of an ice grain spraying device.
In the first step, ice particles are produced by the ice making machine 1 which is an ice making means provided in the upper part.
In the second step, the large funnel portion 2 which is an ice particle collecting means collects ice particles falling from the ice machine 1 at the lower part of the ice machine 1.
In the third step, light from the optical sensor 5 is irradiated to the ice particles falling from the outlet of the large funnel portion 2.
In the fourth step, the small funnel portion 4 is provided in the lower portion of the large funnel portion 2, receives ice particles flowing down from the large funnel portion 2, and conveys them to the workpiece via the suction hose portion 4 a.
In the fifth step, ice particles are jetted at high speed by a high-pressure pump from a nozzle connected to the tip of the suction hose portion 4a, and the burrs of the workpiece are crushed to remove the burrs.
In the sixth step, when it is determined by the optical sensor 5 that the large funnel portion 2 is clogged, water is injected into the large funnel portion 2 to melt ice particles, and the large funnel portion 2 is clogged. Is solved.

Here, the operation of the method for detecting clogging in the funnel of the ice particle ejection device 10 provided with the optical sensor 5 for the regression laser beam will be described. As shown in FIG. 1, when the inner drum type ice making machine 1 as an ice making means is turned on, the drum rotates and sprinkles water inside the drum that maintains a low temperature, and instantly creates ice particles inside the drum. Peel off and scrape off with a rotating claw provided at the tip of the revolving door (not shown).
The ice particles scraped off fall down and fall into the large funnel portion 2 arranged below. When the ice particles flow down to the small funnel portion 4, the ice particles are sucked into the suction hose portion 4a by the injection of the high-pressure water injection nozzle, and the impact energy of the high pressure is loaded on the ice particles. The ice particles collide with the burr and break from the burr root to remove the burr.

At this time, when the ice particles are falling on the large funnel portion 2, the laser light is irradiated from the regression optical sensor 5 to the ice particles falling from the outlet of the large funnel portion 2, and when the ice particles are not detected, the large funnel It is determined that there is “clogging” in the section 2, and removal of “clogging” is started immediately.
The removal of “clogging” is achieved by spraying water from the eight water injection nozzles 2d arranged in the cylindrical portion 2c of the large funnel portion 2 all together, and removing the clogged ice particles at the outlet 2a at the lower portion of the large funnel portion 2. Unravel and remove.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be implemented with appropriate modifications. For example, the large funnel portion 2 may be molded from Teflon (registered trademark), which is a material having a low thermal conductivity and a low friction coefficient, or polypropylene. Further, a Teflon (registered trademark) tape may be attached to the inner peripheral surface such as vinyl chloride or stainless steel, or a material having a water repellent function may be coated. Furthermore, the optical sensor may be another sensor.

It is a front view of the ice grain injection device of the ice blast processing of the present invention. FIG. 2 is a cross-sectional view taken along the line A-A shown in FIG. 1, showing the operation of the optical sensor of the regressive laser beam, (a) is a cross-sectional view showing a state in which the clogging in the funnel is detected, and (b) It is sectional drawing which shows the state which is not detected. FIG. 2 is a cross-sectional view taken along line AA shown in FIG. 1, showing the operation of the optical sensor for the transmissive laser beam, (a) is a cross-sectional view showing a state in which the funnel is clogged, and (b) is clogged in the funnel. It is sectional drawing which shows the state which detected nothing. It is a flowchart figure explaining the clogging detection method in the funnel of an ice grain injection apparatus. It is a perspective view which shows the conventional level detector of powder.

Explanation of symbols

1 Ice machine 2 Large funnel (ice collection means)
2a Exit 2b Opening 2c Cylindrical part 2d Water injection nozzle 2e Water injection hose 3 Piping part 4 Small funnel part 4a Suction hose part 5 Optical sensor 5a Light projecting light sensor 5b Light receiving light sensor 5c Reflector 10 Ice particle ejection apparatus

Claims (2)

An ice making machine for producing ice particles; a large funnel portion for collecting ice particles falling from the ice making machine; a piping portion for conveying ice particles collected by the large funnel portion; and an inlet of the piping portion. An ice grain spraying device comprising:
A gap provided between the outlet of the large funnel and the small funnel ,
An optical sensor that irradiates light on the ice particles falling through the gap and detects the presence or absence of ice particles ;
A water injection nozzle for injecting water into the large funnel,
During ice making of the ice making machine, when the ice sensor detects that the ice particles falling through the gap are not clogged and detects clogging in the large funnel portion, water is poured from the water jet nozzle into the large funnel portion. An ice particle spraying device configured to melt the ice particles by spraying to eliminate clogging in the large funnel portion . An ice making machine that manufactures ice grains, a large funnel part that collects ice making falling from the ice making machine, a piping part that conveys ice particles collected by the large funnel part, and an inlet of the piping part In the ice funnel jetting device comprising a small funnel part, a gap between the outlet of the large funnel part and the small funnel part, and an optical sensor provided in the vicinity of the outside of the small funnel part,
A first step of producing ice particles by an ice making machine that is an ice making means provided at the top;
The large funnel is arranged an ice particle collection means at the bottom of the ice making machine, a second step of collecting the ice particles to fall from the previous SL icemaker,
A third step of irradiating light from the optical sensor to the ice particles falling from the outlet of the large funnel;
A fourth step in which a small funnel portion is disposed with a gap provided at a lower portion of the large funnel portion, receives ice particles flowing down from the large funnel portion, and is conveyed to the workpiece via the suction hose portion;
A fifth step in which ice particles are jetted at high speed from a nozzle connected to the tip of the suction hose portion by a high-pressure pump, burrs the workpiece, and the burrs are removed.
When the optical sensor detects that the large funnel is clogged, the sixth step of injecting water into the large funnel to melt the ice particles and eliminating the clog in the large funnel,
A method for detecting clogging in a funnel of an ice grain spraying device.

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