Shot blasting equipment, inspection method, and inspection program

Abstract

To automate before-start-up inspection of a device and automate determination that the device normally operates and determination that the device is in a state of being capable of producing a non-defective product.SOLUTION: A processor (213) performs first inspection processing (T1) and second inspection processing (T'1) after start-up of a device and before a projection material is projected to a projection target object (500). In the first inspection processing (T1), a value of a current supplied to each motor of an impeller (110) is equal to or less than a first threshold (θ1) in a state of the impeller where a motor rotates but the projection material (400) is not fed. In the second inspection processing (T'1), a value of a current supplied to each motor of the impeller is equal to or greater than a second threshold (θ2) in a state where the impeller projects the projection material. The processor causes a display (300) to display at least one of each of the determination results and a determination result obtained by synthesizing the determination results.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a shot blasting device, an inspection method, and an inspection program. [Background technology]

[0002] Conventionally, in shot blasting machines, overload protection devices such as thermal relays have been known as anomaly detection systems that detect whether the motor or a part related to the motor's drive has failed due to an overload. Also known is a system that periodically remotely monitors operation using a sensor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-011665 Summary of the Invention [Problem to be solved by the invention]

[0004] However, these protective devices monitor the production line after it has already started, so by the time an abnormality is detected, one of the parts of the shot blasting equipment is often already broken, resulting in a production halt until the replacement work is completed. Therefore, although pre-start-of-work inspections are important, the time and equipment costs for pre-start-of-work inspections are high and they are not always easy to implement.

[0005] An aspect of the present invention aims to realize automation of pre-operation inspection of equipment, and to automate determination of whether the equipment is operating normally and whether it is in a state where it can produce non-defective products. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, a shot blasting device according to one embodiment of the present invention comprises an impeller having one or more motors that projects projection material at a projection target, and at least one processor, wherein the processor executes, after startup of the device and before projecting the projection material at the projection target, a first inspection process that determines whether a current value supplied to each motor of the impeller is equal to or less than a first threshold value when the motors of the impeller are rotating but not supplying projection material, and a second inspection process that determines whether a current value supplied to each motor of the impeller is equal to or greater than a second threshold value when the impeller is projecting the projection material, and executes a display process that displays at least one of (1) the respective judgment results of the first inspection process and the second inspection process, and (2) a judgment result that combines the judgment results of the first inspection process and the second inspection process on a display.

[0007] The shot blasting apparatus according to each aspect of the present invention may be realized by a computer. In this case, the shot blasting apparatus inspection program that causes the computer to operate as each part (software element) of the shot blasting apparatus, thereby realizing the shot blasting apparatus on the computer, and the computer-readable recording medium on which the program is recorded, also fall within the scope of the present invention. [Effects of the Invention]

[0008] According to one aspect of the present invention, the pre-start inspection of the equipment is automated, and the determination of whether the equipment is operating normally and whether it is in a state where it can produce good products is also automated, contributing to further efficiency improvements. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a block diagram showing the configuration of a shot blasting device. [Figure 2] FIG. 10 is a diagram showing a time axis, a current value, and a judgment logic in an inspection. [Figure 3] FIG. 10 is a flowchart showing the flow of an inspection process. [Figure 4] FIG. 10 is a diagram showing an example of a screen displaying test results. [Figure 5] FIG. 10 is a diagram showing an example of a screen displaying test results. [Figure 6] FIG. 10 is a diagram showing an example of a screen displaying test results. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Embodiment 1] (Configuration of shot blasting equipment) The configuration of a shot blasting apparatus 1 according to one embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a block diagram showing the configuration of the shot blasting apparatus 1.

[0011] As shown in FIG. 1, the shot blasting device 1 comprises a projection device 100, a programmable logic controller (PLC) 200, and a display 300. The projection device 100 projects (strikes) externally supplied projection material 400 onto a projection target 500, thereby performing surface processing such as removing burrs (excess material protruding from the edges of the projection target 500 during the manufacturing process of the projection target 500). The projection material 400 may be, for example, spherical metallic particles (so-called shot) or sharp-edged metallic particles (so-called grit), but may also be non-metallic particles (e.g., glass, ceramics, sand, resin, or plant seeds). The projection target 500 is, for example, an industrial product such as a casting. The amount of projection material 400 projected per unit surface area of the projection target 500 is called the projection density. The projection density affects the projection quality, and a certain projection density is required to maintain a certain projection quality.

[0012] The PLC 200 controls the projection device 100. The display 300 displays various types of information transmitted from the PLC 200.

[0013] The projection device 100 is composed of an impeller group 110 that projects the projection material 400 onto the projection target, a conveyor 120 that transports the projection target 500, a distributor 130 that supplies the projection material 400 to the impeller group 110, a screw 140 that stirs the projection device 100, a bucket elevator 150 that collects the projection material 400 after projection, and a dust collector 160 that collects unwanted material such as burrs that have peeled off from the projection target 500, but may also include other parts not shown. The impeller group 110 includes at least one impeller. In the figure, impellers 111 and 112 are shown, and the other impellers are omitted. The same applies to the following figures. For example, when the projection target 500 has a long shape such as a steel beam, the conveyor 120 cannot project the entire object in one shot, so the conveyor 120 gradually transports the projection material 400 to a position where the projection device 100 projects it (hereinafter referred to as the projection position). Simultaneously with the transportation, the projection device 100 performs projection. Furthermore, when the projection target 500 is large compared to the projection device 100, the projection device 100 may be equipped with a running body for moving the projection device 100 itself, instead of the conveyor 120. The distributor 130 supplies the projection material 400 to each impeller of the impeller group 110 in an amount appropriate for projection. The screw 140 agitates the inside of the projection device 100, for example, by centrifuging the projected projection material 400 and burrs. The bucket elevator 150 collects the centrifuged blast material 400 for refilling into the distributor 130. The dust collector 160 collects the centrifuged burrs and other unwanted materials for disposal. The impeller 111, impeller 112, conveyor 120, distributor 130, screw 140, bucket elevator 150, and dust collector 160 each have a motor M1a, a motor M1b, a motor M2, a motor M3, a motor M4, a motor M5, and a motor M6.

[0014] The PLC 200 is connected to each component of the projection device 100 and controls the projection device 100. The PLC 200 has a communication IF (interface) 211, a memory 212, a processor 213, and an input / output IF 214. The communication IF (interface) 211, the memory 212, the processor 213, and the input / output IF 214 are connected to one another via a bus.

[0015] Various information devices, such as meters (not shown), are connected to the communication IF 211 via a communication network. In this embodiment, the communication network is an analog circuit such as a wired LAN, but it may also be, for example, Ethernet (registered trademark), Wi-Fi (registered trademark), CC-Link (registered trademark), or the like, or may be implemented in the cloud.

[0016] The memory 212 stores, for example, the following information:

[0017] (1) Maximum current value of each motor at the time of shipment from the factory (2) Threshold values and judgment conditions for each motor used in the first inspection process (3) Thresholds and judgment conditions for each motor used in the second inspection process (4) Correlation between the conveying speed of the conveyor 120 and the current value of the motor M2 of the conveyor 120 (5) Inspection results determined by processor 213 An example of a device that can be used as memory 212 is a flash memory.

[0018] The processor 213 executes the first inspection process and the second inspection process. An example of a device that can be used as the processor 213 is a CPU (Central Processing Unit).

[0019] An input device and / or an output device are connected to the input / output IF 214. Examples of output devices connected to the input / output IF 214 include a display and a printer. Examples of input devices connected to the input / output IF include a keyboard and a mouse. For example, HDMI (registered trademark) or USB (registered trademark) can be used as the input / output IF 214. In this embodiment, a display 300 is connected to the input / output IF 214 as an output device.

[0020] The display 300 is a screen for displaying the inspection results of the shot blasting apparatus 1. In this embodiment, a configuration using a touch panel that can be operated by a user is adopted as the display 300, but the present invention is not limited to this. The display 300 may be, for example, a PC (Personal Computer) equipped with a monitor, and may also be equipped with an input device (not shown) such as a mouse.

[0021] (Inspection process flow) The flow of the first inspection process and the second inspection process executed by the shot blasting device 1 will be described with reference to FIGS.

[0022] The flow of the inspection process will be described below with reference to FIGS.

[0023] (Overall inspection procedure) The overall flow of the inspection will be described with reference to Fig. 2. Fig. 2 is a graph showing the transition of the current value related to the motor M1a of the impeller 111 after the projection device 100 is powered on.

[0024] First, when the projection device 100 is powered on, the amount of current in each motor of the projection device 100 temporarily increases and then returns to a low level. During this time, the amount of current fluctuates greatly, which is not suitable for the inspection of this embodiment. Therefore, the processor 213 waits for a certain period of time from when the power is turned on until the waiting period ends. This period of time is referred to as the startup waiting time t. In this embodiment, the startup waiting time t is stored in the memory 212 in advance, but it may also be calculated by the processor 213 from the current value of the motor M1a, for example.

[0025] After the startup standby time t has elapsed, when the impeller 111 is not projecting the projection material 400 (hereinafter referred to as the non-projection state), the motors M1a and M1b are not subjected to the load of the projection material 400. Therefore, if, for example, the motor M1a and the parts related to the drive of the motor M1a are normal, the current value will remain at a low level. If the current value of the motor M1a is higher than a predetermined level in this state, there is a possibility that there is some kind of abnormality in the motor M1a of the projection device 100 or the parts related to the drive of the motor M1a. An abnormality could be a malfunction of the motor M1a, or other mechanical malfunction in the parts related to the drive of the motor M1a. The processor 213 performs a non-projection state monitoring inspection process T1 (first inspection process) to determine the current value during this period. The threshold value for determining that the current value is normal is set to threshold value θ1. If the current value of the motor M1a is equal to or less than θ1 in the non-projection state monitoring inspection process T1, the processor 213 determines that the parts related to the motor M1a are normal. Note that in the following figures, "the motor M1a and the parts related to the drive of the motor M1a are normal" will be expressed as "the parts related to the motor M1a are normal."

[0026] Next, while the impeller 111 is projecting the projection material 400 (hereinafter referred to as the projection state), the motor M1a is subjected to a load of the projection material 400, and therefore the current value remains at a high level. If the current value of the motor M1a is lower than a predetermined level, the amount of projection material 400 supplied from the distributor 130 to the impeller 111 may be insufficient to maintain the projection density. In this case, the processing quality of the shot blasting apparatus 1 cannot be maintained, and the processor 213 must take measures such as increasing the amount of projection material 400 supplied to the distributor 130. The processor 213 performs a projection state monitoring inspection process T'1 (second inspection process) while the impeller 111 is projecting the projection material 400. A threshold value θ2 is set as the threshold value for determining that the current value in the projection state is normal. If the current value of the motor M1a is equal to or greater than θ2, the processor 213 determines through the projection state monitoring inspection process T′1 that the amount of projection material 400 supplied to the impeller 111 is sufficient.

[0027] The processor 213 automatically performs the above-mentioned non-projection state monitoring inspection process T1 and projection state monitoring inspection process T'1 before production actually begins and the projection device 100 projects onto the projection target 500, and displays the results to the user, thereby preventing the production line from stopping and the production of defective products without relying on the visual judgment of an inspector.

[0028] The threshold values θ1 and θ2 can be set for each motor and can be changed at any time. The judgment conditions of "above threshold," "below threshold," "above threshold," and "below threshold" can be set arbitrarily for each motor in the projection state monitoring inspection process T'1. In this embodiment, the threshold value θ1 is set to 10% and the threshold value θ2 is set to 90% of the maximum current value of the motor M1a at the time of factory shipment, which is 100%. The above-described inspections may be performed on motors other than the impeller. For some motors other than the impeller group 110, the processor 213 may not be able to determine whether the current value of the motor is equal to or less than the threshold value θ1 when the impeller group 110 is not projecting the projection material 400. Therefore, for some such motors, the processor 213 may perform a second inspection process, i.e., a projection state monitoring inspection process, to determine whether the current value of the motor is equal to or less than the threshold value θ2. In this case, the processor 213 may determine that the motor-related parts are normal when the current value of the motor is equal to or less than the threshold value θ2. For motors included in the projection device 100 other than the impeller group 110, whether to use the non-projection state monitoring inspection process or the projection state monitoring inspection process to determine whether the motor-related parts are normal can be set for each motor, and can be changed by the user at any time.

[0029] The processor 213 may perform the same processes as the non-projection state monitoring and inspection process T1 and the projection state monitoring and inspection process T'1 in the non-projection state and the projection state after the actual start of production.

[0030] 3, a series of steps in which the processor 213 performs the first inspection process, the second inspection process, and the display process will be described.

[0031] (Non-projectile condition monitoring inspection process) In step S101, the processor 213 determines whether the projection device 100 has started up. This determination may be made, for example, by detecting the current value of various current meters (not shown). If the projection device 100 has not started up (NO in S101), the processor 213 continues to wait. If the projection device 100 has started up (YES in S101), the processor 213 proceeds to step S102. Note that the processor 213 may start the inspection process in response to a user operation, instead of automatically starting the inspection process in step S101.

[0032] In step S102, the processor 213 starts each motor of the projection device 100 without throwing in the projection material 400.

[0033] In step S103, the processor 213 reads the startup waiting time t from the memory 212.

[0034] In step S104, the processor 213 waits for a startup waiting time t before processing.

[0035] The process is repeated from here on up to step S116 for each motor to be inspected that is included in the projection device 100. Whether or not a motor is to be inspected may be set in advance for each motor.

[0036] In step S111, the processor 213 reads the first threshold value θ1 from the memory 212. The threshold value θ1 may be different for each motor, or may be the same for all motors.

[0037] In step S112, the processor 213 obtains the current value of each motor of the projection device 100.

[0038] In step S113, processor 213 determines whether the current value of each motor of projection device 100 is equal to or less than threshold value θ1. If the current value of the motor is equal to or less than threshold value θ1, processor 213 proceeds to step S114 (YES in step S113). If the current value of the motor exceeds threshold value θ1, processor 213 proceeds to step S115 (NO in step S113). The motors to be targeted are arbitrary, and may be only those included in impeller group 110, or all motors included in projection device 100.

[0039] In step S114, the processor 213 determines that the motor-related parts are normal for the motors whose current values are equal to or less than the threshold value θ1.

[0040] In step S115, the processor 213 determines that the motor-related portion is abnormal for the motor whose current value exceeds the threshold value θ1.

[0041] In step S116, the processor 213 stores the inspection result in the memory 212. The inspection result is data combining the motor and the result of whether the motor is normal or abnormal determined in step S114 or S115.

[0042] (Projection status monitoring inspection process) In step S121, the processor 213 causes the distributor 130 to supply the projection material 400 to the impeller group 110. That is, the processor 213 creates a state in which the impeller group 110 is projecting the projection material 400, and then performs a projection state monitoring and inspection process.

[0043] The process is repeated from here on up to step 129 for each motor to be inspected that is included in the projection device 100. Whether or not to inspect a motor may be set in advance for each motor, or only those included in the impeller group 110 may be inspected. In step S122, the processor 213 reads the second threshold θ2 and the judgment condition for the motor from the memory 212. The threshold θ2 may be different for each motor, or may be uniform for all motors. The judgment condition, "above threshold" or "below threshold," may be set for each motor. The judgment condition may include "above threshold" or "below threshold" in addition to "above threshold" or "below threshold." For ease of explanation, however, "above threshold" or "below threshold" will be used. If the judgment condition for the motor is "above threshold θ2," the process proceeds to step S123. If the judgment condition for the motor is "below threshold θ2," the process proceeds to step S126. In this embodiment, the judgment condition "above threshold θ2" is set for the motors of the impeller group 110, and the judgment condition "below threshold θ2" is set for the motors other than the impeller group 110.

[0044] In step S123, the processor 213 determines whether the current value of the motor of the impeller group 110 is equal to or greater than the threshold value θ2.

[0045] In step S124, the processor 213 determines that a sufficient amount of projection material 400 is being supplied from the distributor to the motor of the impeller group 110 whose current value is equal to or greater than the threshold value θ2.

[0046] In step S125, the processor 213 determines that a sufficient amount of projection material 400 is not being supplied from the distributor to the motor of the impeller group 110 whose current value is less than the threshold value θ2.

[0047] In step S126, the processor 213 determines whether the current value of the motor other than the impeller group 110 is equal to or less than the threshold value θ2.

[0048] In step S127, the processor 213 determines that the motor-related parts of the motors other than the impeller group 110 whose current values are equal to or less than the threshold value θ2 are normal.

[0049] In step S128, the processor 213 determines that the motor-related portion is abnormal for the motor other than the impeller group 110 whose current value exceeds the threshold value θ2.

[0050] In step S129, the processor 213 saves the inspection results in memory 212. The inspection results of step S214 or step S215 and step S217 or step S128 are saved in memory 212. The inspection results are combined data of the motor and the determination result of whether the supply of projection material 400 from the distributor 130, determined in step S214 or step S215, is sufficient, or the motor and the determination result of whether the parts related to the motor are normal or abnormal, determined in step S217 or step S218.

[0051] (Display processing) In step S131, the processor 213 displays each test result on the display 300 via the input / output IF 214.

[0052] (Example of display processing) 4 to 6 show examples of screens displayed on display 300 by the display process executed in step 131 of Fig. 3. Note that the examples shown below are merely examples, and each display area may be displayed in a different configuration.

[0053] FIG. 4 is an example of screen σ1 that processor 213 displays on display 300 in step 131 of FIG. 3. Screen σ1 is a screen that displays the results of the non-projection state monitoring inspection process and the projection state monitoring inspection process that were performed before work began (after the device was started and before the projection material was projected onto the projection target), for each motor in the projection device 100, and the overall results of those processes. In this embodiment, "◯" indicates that "the motor-related parts were normal" or "a sufficient amount of projection material was being supplied from the distributor," and "△" indicates that "the motor-related parts were abnormal" or "a sufficient amount of projection material was not being supplied from the distributor." The same applies to the following figures. Note that to clearly indicate the inspection results, other symbols may be used instead of "◯" and "△," and words such as "good" and "bad" may also be used. Furthermore, in this embodiment, the "◯" and "△" are displayed on the left and right, but they do not have to be separated. This also applies to all result display areas described below. The screen σ1 has a total result display area σ101, a screen transition button σ102, a treatment request button σ103, a history check button σ104, and display areas corresponding to each motor of the projection device 100. In this embodiment, the display area σ11a corresponding to the motor M1a of the impeller 111 will be described, and descriptions of the display areas corresponding to the other motors will be omitted as they are similar to the display area σ11a.

[0054] The processor 213 displays in the overall result display area σ101 a comprehensive set of inspection results for all motors that have undergone at least one of the non-projection state monitoring inspection process or the projection state monitoring inspection process. Note that a display for motors that have not been inspected may also be included. In this embodiment, if the result that "a motor-related part was abnormal" or "an insufficient amount of projection material was supplied from the distributor" is obtained for at least one of the motors that have undergone at least one of the non-projection state monitoring inspection process or the projection state monitoring inspection process, a "△" is displayed in the overall result display area σ101, and if not, a "◯" is displayed. In this embodiment, the result that "a motor-related part was abnormal" or "an insufficient amount of projection material was supplied from the distributor" is obtained for motor M1a, so a "△" is displayed in the overall result display area σ101.

[0055] The screen transition button σ102 accepts user operations. When there is user input to the screen transition button σ102, the processor 213 transitions from screen σ1 to another screen not shown. The action request button σ103 accepts user operations. When there is user input to the action request button σ103, the processor 213 notifies, from screen σ1, for example, to another PC on the network not shown, that action is required. For example, if the result shows that "motor M1a was abnormal," the processor 213 notifies another PC on the network not shown that inspection, repair, or replacement of motor M1a is required. The history check button σ104 accepts user operations. When there is user input to the history check button σ104, the processor 213 transitions from screen σ1 to screen σ3.

[0056] The display area σ11a has a member name display area σ11a1, a motor name display area σ11a2, a result display area σ11a3, and a detail display button σ11a4.

[0057] In the component name display area σ11a1, the processor 213 displays the name of a component of the projection device 100 that has a motor. In the present embodiment, "Impeller 111" is displayed, but for example, "Impeller No. 1" may also be displayed. In the motor name display area σ11a2, the name of the motor is displayed. In the result display area σ11a3, the combined results of the non-projection state monitoring inspection process and the projection state monitoring inspection process for the motor M1a are displayed. If the processor 213 finds that "the motor-related part is abnormal" or "the distributor is not supplying a sufficient amount of projection material" for the motor, it displays a "△" in the result display area σ11a3; otherwise, it displays a "◯". The detailed display button σ11a4 accepts a user operation and transitions to the screen σ2, which will be described later.

[0058] 5 is an example of screen σ2 that processor 213 displays on display 300 in step 131 of Fig. 3. Screen σ2 is a screen on which processor 213 displays a graph showing the relationship between the current value of motor M1a of impeller 111 and time series, as well as the results of the non-projection state monitoring inspection process and the projection state monitoring inspection process, so that the user can grasp the details of the inspection results. Screen σ2 has a target component name display area σ21, a result display area σ22, a non-projection state monitoring result display area σ221, a projection state monitoring result display area σ222, a screen transition button σ23, and a current value transition graph display area σ24.

[0059] In the target component name display area σ21, the processor 213 displays the name of the component having the motor to be inspected, but may also display the name of the motor. In this embodiment, the processor 213 displays "impeller 111" having the motor M1a to be inspected.

[0060] In the result display area σ22, the processor 213 displays the same as σ11a3 in Fig. 1. In the non-projection state monitoring result display area σ221, the processor 213 displays the results of the non-projection state monitoring inspection process for the motor M1a. In the projection state monitoring result display area σ222, the processor 213 displays the results of the projection state monitoring inspection process for the motor M1a.

[0061] The screen transition button σ23 accepts a user operation and transitions to the screen σ1. The current value transition graph display area σ24 is a graph showing the transition of the current value of the motor M1a. The vertical axis represents the current value of the motor M1a, and the horizontal axis represents time. The horizontal axis can be a time axis set by the user, and in this embodiment, it displays the time from when the projection device 100 was powered on until the non-projection state monitoring inspection process T1 and the projection state monitoring inspection process T'1 were performed. In this embodiment, the result of the non-projection state monitoring inspection process T1 indicates that the motor M1a was normal, so a "◯" is displayed in the non-projection state monitoring result display area σ221. On the other hand, because the current value of the motor M1a in the projection state is below the threshold value θ2, the judgment result of the projection state monitoring inspection process T'1 indicates that the amount of projection material 400 supplied from the distributor 130 to the impeller 111 is insufficient. Therefore, a "△" is displayed in the projection state monitoring result display area σ222. Possible causes include a failure of a cage (not shown) connecting the distributor 130 and the impeller 111. In this way, the processor 213 individually displays the details of the current value transition graph, allowing the user to properly grasp the location of the failure.

[0062] 6 is an example of a screen σ3 that the processor 213 displays on the display 300 in step 131 of FIG. 3. The screen σ3 is a list of past inspection histories that the processor 213 displays for the user to refer to. The screen σ3 has a screen transition button σ23 and an inspection history list σ31. The screen transition button σ23 is the same as that in FIG. 5.

[0063] In the inspection history list σ31, the processor 213 displays the results of the non-projection state monitoring inspection process and the results of the projection state monitoring inspection process for each motor of the projection device 100, as well as the overall inspection results, sorted by inspection start date and time. In the figure, the processor 213 displays the name of the component that has each motor as a column heading, but the name of the motor may also be displayed. "Non" indicates the result of the non-projection state monitoring inspection process, and "Projected" indicates the result of the projection state monitoring inspection process. In the "Overall" column, if either the result of the non-projection state monitoring inspection process or the result of the projection state monitoring inspection process for any motor of the projection device 100 is "△", the processor 213 displays "△", meaning there is a problem, and if not, it displays "◯". In this embodiment, for the latest non-projection state monitoring inspection process and projection state monitoring inspection process performed at 11:24 on July 24, the projection state monitoring inspection process result for the motor M1a of the impeller 111 was "△", so the processor 213 displays "△" in the "Overall" column.

[0064] [Embodiment 2] Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals will be used to designate components having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0065] When the conveyor 120 transports the projection target 500 during the projection process, the projection density varies depending on the transport speed. Therefore, the transport speed must be taken into consideration when determining whether the supply amount of the projection material 400 is appropriate. The transport speed of the motor M2 of the conveyor 120 slows down due to aging or other factors. If the transport speed slows down, the projection density may become too high and quality may not be maintained. Therefore, the processor 213 may determine whether the transport speed of the conveyor 120 is within a predetermined range. Because the transport speed of the conveyor 120 correlates with the operating frequency of the motor M2, the memory 212 may previously store a correspondence relationship between the operating frequency of the motor M2 and the transport speed of the conveyor 120. The processor 213 may read the correlation data from the memory 212 and calculate the transport speed of the conveyor 120 from the inverter frequency of the motor M2. Specifically, the processor 213 may compare the conveying speed converted using the inverter frequency of the motor M2 with the conveying speed converted from the count number of a rotation detection sensor attached to a roller (not shown) of the conveyor 120, to calculate whether the conveying speed of the conveyor 120 is normal. Furthermore, the processor 213 may perform a third inspection process to determine whether the projection conditions from the impeller group 110 are appropriate based on the results of the projection condition monitoring inspection process and the conveying speed of the conveyor 120, and may display the determination results of the third inspection process on the display in the display process.

[0066] (Additional notes) The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in the above-described embodiments are also included in the technical scope of the present invention. Regarding thresholds, "greater than" and "less than" may be written as "greater than" and "less than," respectively.

[0067] [Software implementation example] The functions of the shot blasting device 1 (hereinafter referred to as the "device") can be realized by a program that causes a computer to function as the device, and a program that causes a computer to function as each control block of the device (particularly each part included in the processor).

[0068] The program may be non-transitory and may be recorded on one or more computer-readable recording media. The recording media may or may not be included in the device. In the latter case, the program may be supplied to the device via any wired or wireless transmission medium.

[0069] Furthermore, some or all of the functions of the control blocks can be realized by logic circuits. For example, an integrated circuit in which a logic circuit that functions as each of the control blocks is formed is also included in the scope of the present invention. In addition, the functions of the control blocks can also be realized by, for example, a quantum computer.

[0070] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0071] 1 Shot blasting equipment 100 Projection device 110 Impeller group 111 Impeller 120 Conveyor 130 Distributor 200 PLC 212 memory 213 processors 300 displays 400 Projection material 500 Projection target M1a, M2 motors t Wait time at startup T1 Non-projection condition monitoring inspection process T'1 Projection status monitoring inspection process θ1, θ2 threshold σ1, σ2, σ3 screen

Claims

1. an impeller having one or more motors that projects projection material onto a projection target; at least one processor; The processor: a first inspection process for determining whether or not the value of current supplied to each motor of the impeller is equal to or less than a first threshold value when the motor is rotating but no projection material is being supplied; a second inspection process for determining whether or not a current value supplied to each motor of the impeller is equal to or greater than a second threshold value while the impeller is projecting the projection material; After starting the device, execute this before projecting the projection material onto the target object. (1) a display process is executed to display on a display at least one of the determination results of the first inspection process and the second inspection process, and (2) a determination result obtained by integrating the respective determination results of the first inspection process and the second inspection process; If there is a problem in either the first inspection process or the second inspection process, it is determined that there is a problem as the overall judgment result, and if there is no problem in either the first inspection process or the second inspection process, it is determined that there is no problem as the overall judgment result. Shot blasting equipment.

2. The shot blasting apparatus according to claim 1 , wherein the processor executes the first inspection process and the second inspection process consecutively in this order.

3. 3. The shot blasting apparatus according to claim 1, wherein the processor, in the first inspection process, also determines whether or not a current value of at least a part of a motor other than the impeller of the shot blasting apparatus is equal to or less than a threshold value.

4. 4. The shot blasting apparatus according to claim 1, wherein in the second inspection process, the processor also determines whether or not a current value of at least a part of a motor other than the impeller of the shot blasting apparatus is equal to or less than a threshold value.

5. the shot blasting device includes a conveyor that transports the object to be blasted; the processor acquires a transport speed at which the conveyor transports the projection object, and executes a process of determining whether the transport speed is within a predetermined range. The shot blasting device according to any one of claims 1 to 4.

6. the processor performs a third inspection process to determine whether the projection state of the projection material by the impeller is in a predetermined state based on the determination result of the second inspection process and the conveying speed, and displays the determination result of the third inspection process on the display in the display process. The shot blasting device according to claim 5.

7. A method for controlling a shot blasting machine having an impeller that has one or more motors and projects blast material onto a projection object, comprising: a first inspection process for determining whether or not the value of current supplied to each motor of the impeller is equal to or less than a first threshold value when the motor is rotating but no projection material is being supplied; a second inspection process for determining whether or not a current value supplied to each motor of the impeller is equal to or greater than a second threshold value while the impeller is projecting the projection material; After starting the device, execute this before projecting the projection material onto the target object. (1) executing a display process of displaying on a display at least one of the determination results of the first inspection process and the second inspection process, and (2) a determination result obtained by combining the determination results of the first inspection process and the second inspection process; If there is a problem in either the first inspection process or the second inspection process, it is determined that there is a problem as the overall judgment result, and if there is no problem in either the first inspection process or the second inspection process, it is determined that there is no problem as the overall judgment result. A method for controlling a shot blasting device.

8. A program for causing a computer including the processor to function as the shot blasting apparatus of claim 1, the program causing the processor to execute the first inspection process, the second inspection process, and the display process.

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