JP4504779B2 - Ice grain sprayer - Google Patents

Description

  The present invention relates to an ice particle injection device that injects ice particles mixed with high-pressure water onto a work from an injection nozzle.

Blasting pellets or flaky ice particles on the workpiece as an effective and low-cost blasting device to remove burrs generated during processing of objects (hereinafter referred to as “workpieces”), burrs generated during processing, or dirt. There was an ice grain sprayer. There is an ice water blasting device (see Patent Document 1) in which high-pressure blast water is used as a means for transporting ice particles in the ice particle spraying device so as to obtain a strong blasting effect.
Specifically, when the base end is closed and a pipe having an injection nozzle at the end of a closed tube structure, when high-pressure water is injected from the closed end side toward the injection nozzle side, the high-speed fluid circulating in the pipe draws surrounding objects. A negative pressure is formed in the pipe by the well-known “Bernoulli's law” by sucking. The ice particles are sucked by the negative pressure, and the ice particles mixed with the high-pressure jet water are jetted from the jet nozzle.
In other words, in the ice particle injection device, a high pressure jet water flows quickly to generate a negative pressure in the suction hose, and the negative pressure sucks the ice particles into the suction hose, mixes with the high pressure injection water and sprays it onto the workpiece. is there. Thus, the ice particles are sucked by the negative pressure, and the fluid mixed with the high-pressure jet water is jetted from the jet nozzle. This fluid blasting is sometimes referred to as ice water blasting.
Japanese Patent Laying-Open No. 2004-122296 (paragraphs 0004 to 0010, FIG. 2)

  However, if the ice particles in the vicinity of the elbow etc. are partially melted by re-freezing after the pipes heated at room temperature when the demand, supply or transportation of the ice particles are temporarily suspended due to the convenience of the blasting process, There is a problem that icing moisture adheres to the inner wall, and a plurality of ice particles become a lump and are prevented from moving and discharging, resulting in a decrease in blasting ability.

  Accordingly, the present invention has been developed to solve these problems, and ice that enables smooth operation without waste, including the case where the demand, supply or conveyance of ice particles is temporarily stopped. It is an object to provide a grain injection device.

In order to solve the above-mentioned problem, the invention according to claim 1 is collected by the ice making means for making the ice particles 1, the large funnel 4 for collecting the ice particles 1 falling by the ice making means, and the large funnel 4. A pipe 5 for conveying the ice particles 1, a small funnel 5a formed at the inlet of the pipe 5, an elbow 5b connected to the reduced diameter portion of the small funnel 5a and forming a part of the pipe 5, and a gap X In an ice particle injection device 100 comprising an installed suction hose 5c and an injection nozzle 10 that mixes the ice particles 1 collected by the large funnel 4 with high-pressure water 9 and sprays the workpiece onto the workpiece, Ice flow detection means 80 arranged to detect the presence or the flow state of the ice particles 1;
Based on the detection result by the ice flow detecting means 80 and the ice flow detecting actuator 80 which can change the flow of the ice particles 1 from the large funnel outlet 4b which is the outlet of the large funnel 4 to the small funnel 5a and cut off the supply. An ice particle ejecting apparatus 100 comprising: an interruption control means 40 for controlling an interruption operation of the ice flow interruption actuator 30.

According to the first aspect of the present invention, the ice particles 1 collected by the large funnel 4 are sucked into the suction hose 5 c by the negative pressure generated by the high-pressure water injection in the injection nozzle 10. The ice particles 1 sucked into the suction hose 5c under a negative pressure are mixed with the high-pressure water 9 and sprayed onto the work from the spray nozzle 10.
Then, when the injection of the ice particles 1 is intermittent, the partially melted water of the ice particles 1 is frozen on the inner wall of the pipe 5 along with the ice particles 1 to narrow the effective inner diameter. If the ice flow detecting means 80 detects that the flow of the ice particles 1 has stopped or stagnated, the ice flow blocking actuator 30 moves the ice particles 1 from the large funnel outlet 4b to the small funnel 5a. Since the flow is changed and the excessive supply is stopped, the blockage by the ice particles 1 stagnating in the pipe 5 can be prevented.
Therefore, even if the injection of the ice particles 1 sprayed onto the work from the injection nozzle 10 is intermittent due to the convenience of the process, the ice making means can be stably operated continuously. Of ice particles 1 can be supplied.
In particular, it is possible to eliminate the waste of cold insulation management when resuming ice making after interrupting the continuous operation of the ice making means, and stable injection can be resumed immediately after the injection of ice particles 1 is interrupted.

  The invention according to claim 2 is characterized in that an ultrasonic displacement meter 50 is disposed between the elbow 5b and the suction hose 5c as the ice flow detecting means 80. 100.

  According to the second aspect of the invention, the ultrasonic displacement meter 50 can detect the displacement of the object in a non-contact state, and therefore can be effectively used as the ice flow detection means 80. This ultrasonic displacement meter 50 is disposed between the elbow 5b and the suction hose 5c, and this detection location is the location where the flow of the ice particles 1 is most likely to be clogged. Therefore, the ice flow at this detection location is detected. If it is closing, the control information according to the detection result is transmitted to the ice flow interrupting actuator 30, and the flow of the ice particles 1 is changed from the large funnel outlet 4b to the small funnel 5a, so that the excessive supply is achieved. Since it stops, the blockage by the ice particles 1 stagnating in the pipe 5 can be prevented.

  The invention according to claim 3 is characterized in that a radiation thermometer 60 is disposed between the elbow 5b and the suction hose 5c as the ice flow detecting means 80. The ice according to claim 1 or 2, This is a grain injection device 100.

  Since the radiation thermometer 60 can detect the temperature of the object in a non-contact state, it can be effectively used as the ice flow detection means 80. The radiation thermometer 60 is disposed between the elbow 5b and the suction hose 5c, and this detection location is a dangerous location where the flow of the ice particles 1 is most likely to be clogged. And if the fresh and low-temperature ice particle 1 is flowing normally in the detection location, a considerably low-temperature state will continue. However, if the ice flow deteriorates, the temperature rises above the reference value, so that it is detected that the temperature is rising and is blocked, and control information corresponding to the detection result is transmitted to the ice flow interrupting actuator 30. Since the excessive supply is stopped by changing the flow, the blockage by the ice particles 1 stagnating in the pipe 5 can be prevented.

  The invention according to claim 4 is characterized in that a negative pressure sensor 70 is disposed between the elbow 5b or the suction hose 5c as the ice flow detecting means 80. The ice particle injection device 100 according to the item.

  According to the invention of claim 4, the negative pressure sensor 70 detects the negative pressure in the pipe 5, and is equal to a reference value that has been measured in advance if the ice particles 1 are flowing normally in the pipe 5. Detect negative pressure. However, if the ice flow deteriorates, the negative pressure in the pipe 5 deviates from the reference value. Therefore, it is detected that the negative pressure is closing, and control information corresponding to the detection result is sent to the ice flow interrupting actuator 30. Since the excessive supply is stopped by changing the flow of the ice particles 1, the blockage caused by the ice particles 1 remaining in the pipe 5 can be prevented.

According to the first aspect of the present invention, the ice making means can be stably operated continuously even if the injection of the ice particles 1 sprayed onto the workpiece from the injection nozzle 10 is intermittent due to the convenience of the process. It is possible to supply high-quality ice particles 1 of uniform quality and grain.
In particular, it is possible to eliminate the waste of cold insulation management when resuming ice making after interrupting the continuous operation of the ice making means, and stable injection can be resumed immediately after the injection of ice particles 1 is interrupted.

  According to the inventions according to claims 2 to 4, a detection value equal to a reference value that has been measured in advance is detected if fresh and low-temperature ice particles 1 are flowing in a normal manner at the detection location. However, if the ice flow deteriorates, the negative pressure of each sensor deviates from the reference value. Therefore, it is detected that the sensor is closing due to the deviating, and control information corresponding to the detection result is sent to the ice flow interrupting actuator 30. Since the excessive supply is stopped by transmitting and changing the flow, the blockage by the ice particles 1 stagnating in the pipe 5 can be prevented.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of an essential part of an ice grain spray device 100 according to the present invention. As shown in FIG. 1, in the ice particle injection device 100 of the present invention, the ice making means for producing the ice particles 1 is an internal drum type ice making machine 2. The ice making machine 2 is placed on a gantry (not shown). Below the ice making machine 2, a large funnel 4 for receiving and collecting ice particles 1 falling from the bottom surface of the ice making machine 2 within the area of the bottom surface opens the large funnel inlet 4a upward. Arranged.

  An ice making machine 2 shown in FIG. 1 is an inner drum type ice making means, and a thin piece of ice is stretched on the inside of the drum, which is scraped off by a rotating claw and dropped downward (details are not shown). The ice making machine 2 uses the inner drum type because the inner drum type has higher speed and efficiency than the outer drum type, so the ice making machine 2 is not limited to the inner drum type. Note that the vertical length of the drum of the ice making machine 2 in FIG. 1 is extremely short compared to the actual machine because it is not related to the technical idea of the present invention, but this is due to space limitations. The positional relationship is shown so that the ice making machine 2 can drop the ice particles 1 on the large funnel inlet 4a.

  As shown in FIG. 1, the large funnel 4 has a diameter of the large funnel inlet 4a so that the ice particles 1 falling in the range of the drum diameter D (see FIG. 1) of the ice making part of the ice making machine 2 can be collected without leakage. Is formed in a larger diameter. At the inner peripheral edge of the large funnel inlet 4a, spray nozzles 4c for spraying downward along the inner peripheral surface are arranged at equal intervals. The injection nozzle 4c receives water appropriately from the water supply hose 4d.

  The large funnel 4 is made of a material having a low coefficient of friction so that the ice particles 1 are not easily melted, and have a low thermal conductivity, that is, a high heat insulating property, and can be quickly slid down. For example, Teflon (registered trademark) or polypropylene is suitable. In addition, as is well known for the prevention of scorching of home cooking frying pans, the surface of iron or aluminum may be Teflon (registered trademark) processed, or the entire body may be made of resin containing Teflon (registered trademark) powder. It doesn't matter.

  The large funnel 4 receives the ice particles 1 widely and periodically wash away the ice adhering to the inner surface of the funnel by intermittent injection by the injection nozzle 4c. In addition, the interval of intermittent injection is 0.5 seconds, and after 3 repetitions of 3 seconds pause, it is paused for 60 seconds and good results are obtained. It may be a cycle. Further, during water injection, the ice flow blocking actuator 30 blocks the ice supply to the spray nozzle 10.

  2 is an enlarged side cross-sectional view of the main part shown in FIG. 1, and is an enlarged perspective view of the configuration of the pipe 5 in the vicinity of the large funnel outlet 4b and the elbow 5b shown in FIG. The large funnel outlet 4b is not directly connected to the pipe 5, but has a connection configuration in which the ice particles 1 are delivered to the small funnel 5a while maintaining the open state of the place where the ice particles 1 are delivered. As described above, the special connection form is used for the purpose of maintaining the operation efficiency, the continuous operation efficiency for the ice making machine 2 that stably supplies the ice particles 1 at a constant supply speed, and the constraint condition for the ice particle injection device 100 that is forced to use intermittently. In order to satisfy both of the above, it is possible to appropriately supply and block the ice particles 1 at the place where the ice particles 1 are delivered.

  The ice particles 1 are in continuous injection, that is, in a continuous operation state, and the demand amount and the supply amount are balanced. That is, the supply and demand balance is achieved by completely injecting the amount produced by the ice making machine 2. However, as a restriction condition for the ice grain injection device 100, there is a timing for naturally stopping the injection due to the convenience of the workpiece, and the supply timing is excessive at that stop timing, and this excess is absorbed or discarded by any of the supply systems. It is necessary to balance supply and demand. Therefore, it is configured to block the ice particles 1 at the place where the ice particles 1 are delivered, and the ice particles 1 flowing down from the large funnel outlet 4b are received near the large funnel outlet 4b. It sprays so that the ice particle 1 may be sprayed to the workpiece | work which is not shown in figure from the injection nozzle 10 (refer FIG. 3) mentioned later via the elbow 5b.

  A small funnel 4 is formed as the first inlet of a pipe 5 that conveys the ice particles 1 collected by the large funnel 4, and an elbow 5 b is extended on the reduced diameter side of the small funnel 4. Further, the elbow outlet 5d is opened, and the suction hose inlet 5e is moved to a position where the gap X is spaced in the direction of extending the tube shaft 5h of the elbow outlet 5d and the step Y is lowered from the tube shaft 5h. The suction hoses 5c opposed to each other are linked so that the ice particles 1 can pass through these gaps X obliquely downward. Most of the ice particles 1 overflow and flow along the elbow bottom surface 5g due to free fall, but if the suction hose center line 5f is substantially aligned with the extension line of the elbow bottom surface 5g, the ice particles 1 are absorbed by the strong suction force at the center. Since the suction is performed, the flow of the ice particles 1 passing through the gap X is good. When there is no gap X and the elbow 5b is directly connected to the suction hose 5c, the ice particles 1 accumulate on the inner surface of the bent portion of the elbow 5b and are blocked.

An ultrasonic displacement meter 50 and a radiation thermometer 60 are disposed so as to aim at the ice particles 1 passing through the gap X.
The ultrasonic displacement meter 50 is disposed above the gap X, and measures the distance from the ultrasonic displacement meter 50 to an object existing between the floor surface 7 through the gap X at every short time. Measure the displacement. Then, if the flow of the ice particles 1 stagnate, it is observed that the measurement distance is shortened by the ice accumulated on the floor surface 7.
The radiation thermometer 60 is disposed obliquely above the gap X, and measures the temperature of the ice particles 1 by detecting the infrared rays emitted by the ice particles 1 with an aim toward the elbow outlet 5d.

  FIG. 3 is a cross-sectional view of the injection nozzle, and the ice particles 1 urged by the high-pressure water 9 from the injection port 11 formed at the tip of the injection nozzle 10 become a high-speed ice particle jet 12, and the target portion ( It is injected toward (not shown). Burrs and the like are generated by pre-processing on the workpiece, and the ice particles 1 collide with the target portion of the workpiece including the burrs and the like to remove the burrs and the like.

  The ice particles 1 in the spray nozzle 10 are sucked from the suction hose 5c with a negative pressure generated around the fast flow of the high-pressure water 9, mixed with the high-pressure water 9, sprayed from the spray nozzle 10, and sprayed onto the workpiece.

FIG. 4 is a block diagram of an ice particle injection device 100 according to the present invention. Ice particles 1 produced by the ice making machine 2 are collected by a large funnel 4 and injected through a pipe 5 elbow 5b and a suction hose 5c. It is a figure for demonstrating the concept of the control which balances supply-and-demand until it ejects the high-speed ice droplet jet 12 from.
4 controls the connection positional relationship between the elbow 5b communicating with the suction hose 5c and the large funnel 4 according to the detection result of the ice flow detection means 80 by the interruption control means 40.

The large funnel outlet 4b is substantially open and connected to the pipe 5 (see FIG. 1). Then, the ice particles 1 are injected into the elbow 5b, the suction hose 5c and the injection nozzle 10 starting from the small funnel 5a (see FIG. 1), and the piping 5 is injected from the injection nozzle 10 toward the workpiece as a high-speed ice particle jet 12. To do.
Further, as shown in the pipe 5 and the surrounding configuration (see FIG. 1), an ice flow that is arranged between the elbow 5b and the suction hose 5c in the middle of the pipe 5 to detect the presence or flow state of the ice particles 1 Based on the ice flow detection results detected by the ultrasonic displacement meter 50, the radiation thermometer 60, and the negative pressure sensor 70 as the detection means 80, the interruption control means 40 appropriately controls the ice flow interruption actuator 30.
Various sensors used for the ice flow detection means 80 may be sensors of other types as long as they can detect the flow state of the ice particles 1 in the pipe 5 without being in contact with the ice particles 1. For example, as shown in FIG. 4, an optical ice flow sensor 81 or a capacitive ice flow sensor 88 may be used in combination as appropriate.

  The ice flow interrupting actuator 30 can change the flow of the ice particles 1 from the large funnel outlet 4b to the small funnel 5a to eliminate the generated ice. Specifically, the air cylinder 8 fixed to a cylinder fixture (not shown) moves the ice flow shut-off actuator 30 in parallel by moving the piston inside and behind by appropriate control of the shut-off control means 40, Block ice flow. In other words, if the ice flow detection means 80 detects that the flow of the ice particles 1 is stopped or stagnating in the middle of the pipe 5, it stops the forced flow of the ice particles 1 into the pipe 5. The connection between the elbow 5b and the large funnel 4 is cut off. That is, the connection is interrupted by moving so that both opening portions that have been opposed so far are separated from each other.

  Further, the ultrasonic displacement meter 50 disposed between the elbow 5b and the suction hose 5c is suitable as the ice flow detection means 80 because it can detect the displacement of the ice particles 1 as the object in a non-contact state. In addition, this detection location is a dangerous location where the flow of ice particles 1 is most likely to be clogged. If the ice flow at this detection location is detected and blocked, the control information corresponding to the detection result is interrupted. The excessive supply is stopped by changing the flow of the ice particles 1 transmitted to the actuator 30 and flowing from the large funnel outlet 4b exclusively into the small funnel 5a so as not to flow into the small funnel 5a. Therefore, blockage due to the ice particles 1 stagnating in the pipe 5 can be prevented.

The ultrasonic displacement meter 50 is a distance measuring device from the sensor to the object, and is a measuring device that recognizes the movement of the object by detecting that the distance has changed. Therefore,
1) When there is no ice particle 1 ... The fixed distance from the sensor to the floor 2) When the ice particle 1 is flowing ... The distance from the sensor varies finely within the range of the ice flow thickness. 3) When the ice particles 1 are clogged ... The pipe ice flow thickness increases from the sensor. If you know in advance whether the long distance is fixed, the fluctuation continues, or the short distance is fixed, According to the detection value of the ultrasonic displacement meter 50, the state in the pipe 5 is 1) there is no ice particle 1 if it is a long distance, 2) it is flowing if the fluctuation is continued, 3) it is clogged if it is a short distance, Can be estimated.

  For convenience of explanation, it is clearly distinguished from one selected from any one of these 1), 2), and 3), but it is not necessary to limit the displacement stage to be detected to three stages. In practice, if the blockage is occurring, control information corresponding to the detection result may be transmitted to the ice flow interrupting actuator 30 steplessly and optimally controlled.

  If it is estimated that the ice particles 1 are clogged in the pipe 5, the inlet of the pipe 5 to the large funnel outlet 4b is prevented so that the ice particles 1 are not forced to flow from the large funnel outlet 4b to the small funnel 5a. Change the connection. Then, the ice particles 1 overflowing without entering the inlet of the pipe 5 fall to the ice drop opening 6a of the tank 6b on the floor surface, melt and become water, and are circulated for use.

  Moreover, the radiation thermometer 60 is arrange | positioned between the elbow 5b and the suction hose 5c as another flow detection means. Since this radiation thermometer 60 can detect the temperature of the object in a non-contact state, it can be effectively used as the ice flow detection means 80. That is, the radiation thermometer 60 is disposed between the elbow 5b and the suction hose 5c, and this detection location is a dangerous location where the flow of the ice particles 1 is most likely to be clogged.

  Here, if the fresh and low-temperature ice particles 1 are flowing in the detection location as usual, the refrigerant is also circulating in the pipe 5, so that a considerably low temperature state continues as the reference value. However, if the ice flow deteriorates, the temperature rises above the reference value, so that it is detected that the pipe 5 is closing due to the temperature rise, and control information corresponding to the detection result is sent to the ice flow interruption actuator 30. Since the excessive supply is restricted or stopped by changing the flow of the ice particles 1, the blockage by the ice particles 1 stagnating in the pipe 5 can be prevented.

  When the injection of the ice particles 1 is intermittent due to the circumstances of the process, the partially melted water of the ice particles 1 is frozen on the inner wall of the pipe 5 along with the ice particles 1 to stop the effective pipe diameter. If the ice flow detecting means 80 detects that the flow of the ice particles 1 has stopped or stagnated, the ice flow blocking actuator 30 is the large funnel that is the outlet of the large funnel 4. Since supply of the ice particles 1 is changed by changing the flow of the ice particles 1 from the outlet 4b to the small funnel 5a, blockage by the ice particles 1 stagnating in the pipe 5 can be prevented.

The ice particles 1 collected by the large funnel 4 are sucked into the suction hose 5 c by the negative pressure generated around the fast flow of the high-pressure water 9. The ice particles 1 sucked into the suction hose 5c under a negative pressure are mixed with the high-pressure water 9 and sprayed onto the work from the spray nozzle 10.
And even if the injection of the ice particles 1 sprayed onto the workpiece from the injection nozzle 10 is intermittent due to the convenience of the process, the ice making machine 2 can maintain economic efficiency by a stable continuous operation. This is because, after the ice making process of the ice making machine 2 is interrupted and the temperature rises, it is possible to eliminate the waste of cold storage management that rapidly cools and resumes ice making.
Therefore, even after the injection of the ice particles 1 is interrupted, the injection of the ice particles 1 with stable quality can be resumed promptly. As described above, according to the ice particle ejecting apparatus 100, even if various conditions such as use frequency and environment are not constant, it is possible to supply the high quality ice particles 1 having the ice quality and the grains at a low cost. Is possible.

Further, the state in the pipe 5 can be estimated by detecting the negative pressure of the suction hose 5c with the negative pressure sensor 70. That is, regarding the negative pressure P in each condition,
1) When there is no ice particle 1 ... P ₀
2) When ice particles 1 are flowing ... P ₁
3) When ice particles 1 are clogged ... P ₂
Vacuum <P ₂ <P ₁ <P ₀ <atmospheric pressure, and if the relationship in which P ₂ is different from the reference value P ₁ is known in advance, the state in the pipe 5 is determined by the detection value of the negative pressure sensor 70. 1) If P ₀ there is no ice particle 1 2) If P ₁ is flowing, it can be estimated that 3) If P ₂ is clogged.

Incidentally, it is also possible to specify the blockage location from the P ₂ value. For example, when the absolute value of the negative pressure is larger than the reference value P ₁ (close to vacuum), the suction hose 5c and the negative pressure sensor 70 are closed, and the absolute value of the negative pressure is higher than the reference value P _1. When the value is small (close to atmospheric pressure), it can be known that the gap between the injection nozzle 10 and the negative pressure sensor 70 is closed. This is a technical idea that if there is a vacuum cleaner equipped with a pressure sensor in the pipe, it can be specified by the pressure sensor which of the suction nozzle and the back blower is closed.

  FIG. 5 is a schematic diagram of an optical ice flow sensor. (A) A state without ice particles and (b) a state with ice particles will be described as a pair comparison. As shown in FIG. 5A, in the optical ice flow sensor 81, if the straight light 85 projected from the light emitting unit 82 is received cleanly by the light receiving unit 83, the ice particles 1 exist in the pipe 5. Is detected. On the contrary, as shown in FIG. 5B, if the straight light 85 projected from the light emitting unit 82 is not received by the light receiving unit 83 or is received dimly, the ice particles 1 exist in the pipe 5. Therefore, it is detected that the straight light 85 becomes irregularly reflected light 86 due to the ice particles 1 and only a part of them reaches the light receiving portion 83. For example, if a known phototransistor is used for the light receiving unit 83, the state in the pipe 5 can be estimated by detecting an output signal due to a change in current according to the illuminance of the received light.

That is, regarding the output signal under each condition,
1) When there is no ice particle 1 ... DC Hi
2) When ice particles 1 are flowing ... White noise (Random frequency component AC)
3) When the ice particles 1 are clogged: DC Low or zero DC Hi, white noise, DC Low can be detected in advance according to the detection value of the optical ice flow sensor 81. It can be estimated that the state in the pipe 5 is 1) no ice particles 1 if DC Hi, 2) flowing if white noise, 3) clogging if DC Low.

  Similarly to the fact that the ultrasonic displacement meter 50 and the optical ice flow sensor 81 can detect the state of the ice particle 1 as the object in the non-contact state, the radiation thermometer 60 is also in the state of the object in the non-contact state. Can be estimated to some extent. That is, since the radiation thermometer 60 detects the wavelength of the infrared ray radiated according to the temperature of the object by a sensor at a distant position and displays the temperature, the object is observed in a non-contact state, and the temperature Thus, the state of the object can be estimated to some extent. This is because the state where the ice particles 1 in the pipe 5 are solid or liquid changes based on the vicinity of 0 ° C. which is a freezing point. Therefore, after the ice particles 1 made and supplied by the ice making machine 2 below the freezing point melt in a sherbet shape in the pipe 5 at room temperature or the like, there is no trouble that the plurality of ice particles 1 are integrated and solidified. The temperature may be controlled so that the pipe 5 can pass smoothly.

FIG. 6 is a schematic diagram of a capacitive ice flow sensor, and the state in the pipe 5 can be estimated by detecting a change in the dielectric constant ε. That is, regarding the dielectric constant ε under each condition,
1) When there is no ice grain 1 ... ε ₀
2) When ice particles 1 are flowing ... ε ₁
3) When ice particles 1 are clogged ... ε ₂
If the relationship of ε ₀ <ε ₁ <ε ₂ is grasped in advance, the state in the pipe 5 is determined based on the detection value of the capacitive ice flow sensor 88, and if 1) ε ₀ , there is no ice particle 1; 2) It can be estimated that ε ₁ is flowing, and 3) ε ₂ is clogged.

In this manner, the detection value of the ultrasonic displacement meter 50 outputs a detection signal of any one of 1) long distance, 2) continuous fluctuation, and 3) short distance.
The temperature information of the radiation thermometer 60 or the detection value of the negative pressure sensor 70 outputs a detection signal of any one of 1) P ₀ , 2) P ₁ , and 3) P ₂ .
Alternatively, the detection value of the optical ice flow sensor 81 outputs a detection signal of 1) DC Hi, 2) white noise, 3) DC Low or zero.
Then, the detection value of the capacitive ice flow sensor 88 outputs a detection signal of any one of 1) ε ₀ , 2) ε ₁ , and 3) ε ₂ .
Since these detection signals are input to the interruption control means 40 as control information, and the operation of the ice flow interruption actuator 30 changes the connection from the large funnel outlet 4b to the small funnel 5a and stops or restricts excessive supply. The blockage by the ice particles 1 stagnating in the pipe 5 can be prevented.

  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, various sensors used for the ice flow detecting means 80 may be sensors of other methods as long as they can detect the flow state of the ice particles 1 in the pipe 5 without being in contact with the ice particles 1. You may use. Further, a single characteristic sensor may be provided at a plurality of locations to form a combination that can be monitored without a blind spot, or may be supplemented with sensors having different characteristics, or may be appropriately handled.

It is a principal part perspective view of the ice particle injection apparatus by this invention. It is the sectional side view to which the principal part shown in FIG. 1 was expanded. It is sectional drawing of an injection nozzle. It is a block diagram of the ice grain injection device by the present invention. It is a schematic diagram of an optical ice flow sensor. (A) No ice particles (b) Ice particles It is a schematic diagram of a capacitive ice flow sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ice grain 2 Ice machine 3 (Remaining) Ice 4 Large funnel 4a Large funnel inlet 4b Large funnel outlet 4c Spray nozzle 4d Water supply hose 5 Piping 5a Small funnel 5b Elbow 5c Suction hose 5d Elbow outlet 5e Suction hose inlet 5f Center of suction hose Wire 5g Elbow bottom 5h Pipe shaft 6a Ice drop 6b Tank 7 Floor 8 Air cylinder 9 High pressure water 10 Injection nozzle 11 Injection port 12 High-speed ice droplet jet 20 High pressure pump 30 Ice flow cutoff actuator 40 Blocking control means 50 Ultrasonic displacement meter 60 Radiation Thermometer 70 Negative Pressure Sensor 80 Ice Flow Detection Means 81 Optical Ice Flow Sensor 82 Light Emitting Unit 83 Light Receiving Unit 84 Signal Processing Unit 85 Straight Light 86 Diffuse Reflected Light 87 Ice Flow 88 Capacitive Ice Flow Sensor 100 Ice Particle Injection Equipment D Drum diameter X Clearance Y Step

Claims (4)

Ice making means for making ice particles (1);
A large funnel (4) for collecting ice particles (1) falling by the ice making means;
A pipe (5) for conveying the ice particles (1) collected by the large funnel (4);
A small funnel (5a) formed at the inlet of the pipe (5);
A suction hose (5c) installed with an elbow (5b) and a gap (X) which are connected to the reduced diameter portion of the small funnel (5a) and form part of the pipe (5);
In an ice particle spraying device (100) comprising: an injection nozzle (10) that mixes the ice particles (1) collected by the large funnel (4) with high-pressure water (9) and sprays it on a workpiece;
Ice flow detection means (80) disposed in the middle of the pipe (5) for detecting the presence or absence or flow state of the ice particles (1);
An ice flow blocking actuator (30) capable of changing the flow of the ice particles (1) from the large funnel outlet (4b), which is the outlet of the large funnel (4), to the small funnel (5a) and blocking the supply;
An ice particle ejecting apparatus (100) comprising: an interruption control means (40) for controlling an interruption operation of the ice flow interruption actuator (30) based on a detection result by the ice flow detection means (80). ).   The ice particle jetting apparatus according to claim 1, wherein an ultrasonic displacement meter (50) is disposed between the elbow (5b) and the suction hose (5c) as the ice flow detecting means (80). (100).   The ice according to claim 1 or 2, wherein a radiation thermometer (60) is disposed between the elbow (5b) and the suction hose (5c) as the ice flow detection means (80). Grain sprayer (100).   The negative pressure sensor (70) is disposed in the elbow (5b) or the suction hose (5c) as the ice flow detection means (80), according to any one of claims 1 to 3. The ice grain spray device (100) described.

Images