Material testing apparatus, and material testing system

Abstract

To regulate the operation of a tensile testing machine when detecting at least a part of the human body according to the state of the tensile testing machine.SOLUTION: A tensile testing machine 1 deforming a test piece TP and measuring the mechanical characteristics of the test piece TP, includes a camera 6 for generating an image P including a movable part of the tensile testing machine 1, a human body detection part 812 for detecting at least a part of the human body based on the image P, a state detection part 815 for detecting the state ST of the tensile testing machine 1, and an operation regulation part 816 for regulating the operation of the tensile testing machine 1 when the human detection part 812 detects the at least part of the human body according to a detection result from the state detection part 815.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a material testing apparatus and a material testing system.

Background Art

[0002] In a material testing machine that deforms a specimen and measures the mechanical properties of the specimen, various techniques for improving user safety are known. For example, the material testing machine described in Patent Document 1 is provided with imaging means for imaging the vicinity of a gripper during a test, and image processing means for identifying the presence or absence of a moving object within the field of view of the imaging means using the output thereof, and stops the drive of the loading mechanism when a moving object is detected.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the material testing machine described in Patent Document 1, when a moving object is identified in the vicinity of the gripper during a test, the drive of the loading mechanism is stopped, but it does not detect at least a part of the human body. Further, Patent Document 1 does not describe the processing when at least a part of the human body is detected in the operating state of the material testing machine other than during the test. For example, the processing when at least a part of the human body is detected in the standby state or the test preparation state of the material testing machine is not described.

[0005] The present invention has been made in view of such circumstances, and an object thereof is to provide a material testing apparatus and a material testing system that regulate the operation of the material testing apparatus when at least a part of the human body is detected according to the state of the material testing apparatus.

Means for Solving the Problems

[0006] The material testing apparatus according to the first aspect of the present invention is a material testing apparatus that deforms a specimen and measures the mechanical properties of the specimen, and includes an imaging unit that generates an image including a movable part of the material testing apparatus or the vicinity of the material testing apparatus, a human body detection unit that detects at least a part of a human body based on the image, a state detection unit that detects the state of the material testing apparatus, and an operation restriction unit that restricts the operation of the material testing apparatus when the human body detection unit detects at least a part of the human body according to the detection result of the state detection unit.

[0007] The material testing system according to the second aspect of the present invention is a material testing system that deforms a specimen and measures the mechanical properties of the specimen, and includes a material testing apparatus and an imaging device that is communicably connected to the material testing apparatus and generates an image including a movable part of the material testing apparatus or the vicinity of the material testing apparatus. The material testing apparatus or the imaging device includes a human body detection unit that detects at least a part of a human body based on the image. The material testing apparatus includes a state detection unit that detects the state of the material testing apparatus, and an operation restriction unit that restricts the operation of the material testing apparatus when the human body detection unit detects at least a part of the human body according to the detection result of the state detection unit.

Effect of the Invention

[0008] According to the material testing apparatus according to the first aspect of the present invention, the operation of the material testing apparatus when at least a part of a human body is detected is restricted according to the state of the material testing apparatus. Therefore, according to the state of the material testing apparatus, the operation of the material testing apparatus when at least a part of a human body is detected can be restricted.

[0009] According to the material testing system according to the second aspect of the present invention, the operation of the material testing apparatus when at least a part of a human body is detected is restricted according to the state of the material testing apparatus. Therefore, according to the state of the material testing apparatus, the operation of the material testing apparatus when at least a part of a human body is detected can be restricted.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiment for Carrying Out the Invention

[0011] Hereinafter, this embodiment will be described with reference to the drawings.

[0012] [1. Structure of Tensile Testing Machine] FIG. 1 is a diagram showing an example of the configuration of the tensile testing machine 1 according to the present embodiment. The tensile testing machine 1 of the present embodiment applies a test force F to the specimen TP and performs a material test for measuring mechanical properties such as the tensile strength, yield point, elongation, and drawing of the specimen TP. The test force F is a tensile force. The tensile testing machine 1 includes a testing machine main body 2 that applies a test force F to the specimen TP to be tested to perform a tensile test, and a control unit 4 that controls the tensile test operation by the testing machine main body 2. The tensile testing machine 1 corresponds to an example of a "material testing device".

[0013] The testing machine main body 2 includes a table 26, a pair of screw rods 28 and 29 erected rotatably in a vertical direction on the table 26, a crosshead 10 movable along these screw rods 28 and 29, a loading mechanism 12 for moving the crosshead 10 to apply a load to the specimen TP, and a load cell 14. The load cell 14 is a sensor that measures the test force F, which is the tensile load applied to the specimen TP, and outputs a test force measurement signal SG1.

[0014] The loading mechanism 12 includes worm reducers 16 and 17 connected to the lower ends of the screw rods 28 and 29, servo motors 18 connected to the worm reducers 16 and 17, and a rotary encoder 20. The rotary encoder 20 is a sensor that measures the rotation amount of the servo motor 18 and outputs a rotation measurement signal SG2 with a number of pulses corresponding to the rotation amount to the control unit 4. And the loading mechanism 12 transmits the rotation of the servo motor 18 to the pair of screw rods 28 and 29 via the worm reducers 16 and 17, and the crosshead 10 moves up and down along the screw rods 28 and 29 as the screw rods 28 and 29 rotate synchronously. The servo motor 18 corresponds to an example of an "actuator".

[0015] An upper gripper 21 for gripping the upper end of the specimen TP is attached to the crosshead 10, and a lower gripper 22 for gripping the lower end of the specimen TP is attached to the table 26. During the tensile test, the testing machine main body 2 grips both ends of the specimen TP with the upper gripper 21 and the lower gripper 22, and applies a test force F to the specimen TP by raising the crosshead 10 according to the control of the control unit 4.

[0016] The control unit 4 includes a general control device 30, a display device 32, and a test program execution device 34. The overall control device 30 is a device that centrally controls the testing machine main body 2 and is connected to be able to transmit and receive signals to and from the testing machine main body 2. The signals received from the testing machine main body 2 are the test force measurement signal SG1 output by the load cell 14, the rotation measurement signal SG2 output by the rotary encoder 20, and appropriate signals required for control and testing, etc. The display device 32 is a device that displays various information based on the signals input from the overall control device 30. For example, during a tensile test, the overall control device 30 displays the displacement measurement value XD indicating the displacement of the crosshead 10 based on the rotation measurement signal SG2 on the display device 32.

[0017] The tensile test program execution device 34 is a device that accepts user operations such as setting operations and execution instruction operations of various setting parameters such as the test conditions of the tensile test and outputs them to the overall control device 30, and has functions such as analyzing the data of the test force measurement value FD. The tensile test program execution device 34 includes a computer. This computer includes a processor such as a CPU (Central Processing Unit) or an MPU (Micro-Processing Unit), a memory device such as a ROM (Read Only Memory) or a RAM (Random Access Memory), a storage device such as an HDD (Hard Disk Drive) or an SSD (Solid State Drive), and an interface circuit for connecting the overall control device 30 and various peripheral devices. Then, by the processor executing the tensile test program, which is a computer program stored in the memory device or the storage device, the above-mentioned various functions are realized.

[0018] Next, the overall control device 30 of this embodiment will be further described. The overall control device 30 includes a signal input / output unit 40 and a control circuit unit 50. The signal input / output unit 40 constitutes an input / output interface circuit that transmits and receives signals to and from the testing machine main body 2. In this embodiment, it has a sensor amplifier 42, a counter circuit 43, and a servo amplifier 44. The sensor amplifier 42 is an amplifier that amplifies the test force measurement signal SG1 output by the load cell 14 and outputs it to the control circuit unit 50. The counter circuit 43 counts the number of pulses of the rotation measurement signal SG2 output by the rotary encoder 20, and outputs a displacement measurement signal A3 indicating the amount of rotation of the servo motor 18, that is, the displacement measurement value XD of the crosshead 10 that moves up and down due to the rotation of the servo motor 18, to the control circuit unit 50 as a digital signal. The servo amplifier 44 is a device that controls the servo motor 18 according to the control of the control circuit unit 50.

[0019] The control circuit unit 50 includes a communication unit 51 and a feedback control unit 52. The control circuit unit 50 includes a computer having a processor such as a CPU or MPU, a memory device such as a ROM or RAM, a storage device such as an HDD or SSD, an interface circuit with the signal input / output unit 40, a communication device that communicates with the tensile test program execution device 34, a display control circuit that controls the display device 32, and various electronic circuits. Further, by the processor of the control circuit unit 50 executing a control program stored in the memory device or the storage device, each functional unit shown in FIG. 1 is realized. In addition, an A / D converter is provided in the interface circuit of the signal input / output unit 40, and the analog test force measurement signal SG1 is converted into a digital signal by the A / D converter. Note that the control circuit unit 50 may be constituted by one or a plurality of appropriate circuits such as integrated circuits such as IC chips and LSIs, not limited to a computer.

[0020] The communication unit 51 communicates with the test program execution device 34, and receives from the test program execution device 34 the setting of test conditions, the set values of various setting parameters, the execution instruction and interruption instruction of the tensile test, etc. Further, the communication unit 51 transmits the test force measurement value FD based on the test force measurement signal SG1 to the test program execution device 34 at an appropriate timing. Further, the communication unit 51 transmits the displacement measurement value XD based on the rotation measurement signal SG2 to the test program execution device 34 at an appropriate timing.

[0021] The feedback control unit 52 performs feedback control on the servo motor 18 of the testing machine main body 2 to execute a tensile test. The feedback control unit 52 is a circuit that performs feedback control on the servo motor 18. When the feedback control unit 52 performs position control, for example, the feedback control unit 52 performs position control on the test force measurement value FD output by the load cell 14. In this case, the feedback control unit 52 calculates the command value dX of the displacement measurement value XD so that the test force measurement value FD matches the test force target value FT, and outputs a command signal A4 indicating the command value dX to the servo amplifier 44. Note that the test force target value FT indicates the target value of the test force measurement value FD.

[0022] [2. Configuration of Safety Device] FIG. 2 is a plan view showing an example of the configuration of the safety device 200. The tensile testing machine 1 further includes a safety device 200. As shown in FIG. 2, the safety device 200 includes a camera 6, a safety door 7, and a safety control device 8.

[0023] The camera 6 generates an image P including the movable part of the testing machine main body 2 according to the instruction of the safety control device 8. The movable part of the testing machine main body 2 includes, for example, the upper gripper 21, the lower gripper 22, the crosshead 10, and the screw rods 28 and 29 shown in FIG. 1. The camera 6 includes image sensors such as a CCD (Charge Coupled Device) and a CMOS (Complementary MOS). The camera 6 corresponds to an example of the "imaging unit".

[0024] The imaging range θ of the camera 6 includes the movable part of the testing machine main body 2 or the vicinity of the testing machine main body 2. The camera 6 generates an image P including the movable part of the testing machine main body 2 or the vicinity of the testing machine main body 2 every predetermined time ΔT in the standby state ST1, the preparation state ST2, and the execution state ST3 of the tensile test of the test piece TP by the tensile testing machine 1. The predetermined time ΔT is, for example, 1 / 30 second. In other words, the frame rate of the camera 6 is 30 fps.

[0025] The "standby state ST1" indicates a state in which the power of the tensile testing machine 1 is turned on and the tensile testing machine 1 can operate. The "preparation state ST2" indicates a state in which the user is preparing for a tensile test such as attaching the test piece TP to the upper gripper 21 and the lower gripper 22. The "execution state ST3" indicates a state in which the tensile testing machine 1 is performing a tensile test on the test piece TP.

[0026] In the present embodiment, the frame rate of the camera 6 is 30 fps, but the embodiment of the present invention is not limited thereto.

[0027] The safety door 7 is a door configured to be openable and closable when the user enters and exits the test chamber in which the testing machine main body 2 is arranged. A sensor S is arranged on the safety door 7. When the safety door 7 is in the closed state, entry of the user into the test chamber in which the testing machine main body 2 is arranged is prohibited. The sensor S detects whether the safety door 7 is in the closed state. The sensor S is composed of, for example, a proximity sensor, a touch sensor, etc. The detection signal of the sensor S is transmitted to the safety control device 8.

[0028] As shown in FIG. 2, the safety control device 8 is composed of a personal computer including a control unit 81, a notification unit 82, a communication unit 83, and various electronic circuits.

[0029] The control unit 81 controls the operation of the safety device 200. Also, the control unit 81 is configured to be communicable with the control circuit unit 50, and controls the operation of the camera 6 according to an instruction from the control circuit unit 50. The control unit 81 determines, for example, the imaging timing of the camera 6 according to an instruction from the control circuit unit 50. The control unit 81 includes a processor 81A such as a CPU or an MPU, and a memory device 81B such as a ROM or a RAM. Also, by the processor 81A executing a control program stored in the memory device 81B, each functional unit shown in FIG. 3 is realized.

[0030] The notification unit 82 includes an LCD (liquid crystal display), a rotating lamp, a speaker, etc., and notifies various information to the outside. The communication unit 83 communicates with the control circuit unit 50 and the camera 6. The communication unit 83 receives various information from the control circuit unit 50. The communication unit 83 receives the image information generated by the camera 6.

[0031] Note that the safety control device 8 is not limited to a personal computer, and may be composed of one or more appropriate circuits such as an integrated circuit such as an IC chip or an LSI. Also, the safety control device 8 may be configured as, for example, a tablet terminal or a smartphone. Also, the safety control device 8 may include programmed hardware such as a DSP (Digital Signal Processor) or an FPGA (Field Programmable Gate Array). Also, the safety control device 8 may include a SoC (System-on-a-Chip)-FPGA.

[0032] [3. Configuration of the Main Parts of the Safety Device] FIG. 3 is a diagram showing an example of the configuration of the main parts of the safety device 200. As shown in FIG. 3, the control unit 81 of the safety control device 8 includes an image acquisition unit 811, a human body detection unit 812, a region determination unit 813, a door detection unit 814, a state detection unit 815, and an operation restriction unit 816. Specifically, the processor 81A of the control unit 81 of the safety control device 8 functions as the image acquisition unit 811, the human body detection unit 812, the region determination unit 813, the door detection unit 814, the state detection unit 815, and the operation restriction unit 816 by executing a control program stored in the memory device 81B.

[0033] The image acquisition unit 811 causes the camera 6 to image an imaging range θ including the movable part of the testing machine main body 2 or the vicinity of the testing machine main body 2, generates an image P, and acquires the generated image P. The image acquisition unit 811 causes the camera 6 to generate the image P, for example, according to an instruction from the control circuit unit 50. In addition, the image acquisition unit 811 causes the camera 6 to generate the image P every predetermined time ΔT. The predetermined time ΔT is, for example, 1 / 30 second. Specifically, in the standby state ST1, the preparation state ST2, and the execution state ST3 of the tensile test of the tensile testing machine 1, the image acquisition unit 811 causes the camera 6 to generate the image P every predetermined time ΔT. The vicinity of the testing machine main body 2 corresponds to an example of the "vicinity of the material testing device".

[0034] The human body detection unit 812 detects at least a part of the human body based on the image P acquired by the image acquisition unit 811. The human body detection unit 812 detects at least a part of the human body, for example, as follows. In advance, an image of a human body part is learned by machine learning or the like, and a learned model MD is generated. First, the image P is divided into S×S regions. S is, for example, 7. Next, in each of the S×S regions, a plurality of boundary lines are detected based on the color information of each pixel constituting the image P, and the reliability of including at least a part of the human body within the boundary is calculated using the learned model MD. In addition, in each of the S×S regions, the probability of including at least a part of the human body within the region is calculated using the learned model MD. Integrate the reliability of including a human body within the boundary and the probability of including at least a part of the human body within the area to calculate a reliability score. When the reliability score exceeds a threshold value, it is determined that at least a part of the human body has been detected. Specifically, it will be described with reference to FIG. 4 which will be described later.

[0035] In this embodiment, the human body detection unit 812 detects at least a part of the human body using the learned model MD, but is not limited thereto. The human body detection unit 812 may detect at least a part of the human body by, for example, skeleton estimation. That is, the human body detection unit 812 may estimate the skeleton by weighting each joint and detect at least a part of the human body.

[0036] When the human body detection unit 812 detects at least a part of the human body, the area determination unit 813 determines whether the human body detection unit 812 has detected at least a part of the human body in a specific area within the imaging area of the camera 6. In this embodiment, the area determination unit 813 determines whether the human body detection unit 812 has detected at least a part of the human body in the first area AR1 within the imaging area of the camera 6. Further, the area determination unit 813 determines whether the human body detection unit 812 has detected at least a part of the human body in the second area AR2 within the imaging area of the camera 6. Furthermore, the area determination unit 813 determines whether the human body detection unit 812 has detected at least a part of the human body in the third area AR3 within the imaging area of the camera 6. The first area AR1, the second area AR2, and the third area AR3 will be described with reference to FIG. 5 which will be described later. The first area AR1 corresponds to an example of the "specific area".

[0037] The door detection unit 814 detects whether the safety door 7 is in a closed state. The door detection unit 814 detects whether the safety door 7 is in a closed state based on, for example, a signal from the sensor S.

[0038] The state detection unit 815 detects the state ST of the tensile testing machine 1. The state detection unit 815 detects the state ST of the tensile testing machine 1 based on, for example, information from the control circuit unit 50. The state ST of the tensile testing machine 1 is composed of a standby state ST1, a preparation state ST2, and an execution state ST3.

[0039] The operation restriction unit 816 restricts the operation of the tensile testing machine 1 when the human body detection unit 812 detects at least a part of the human body according to the detection result of the state detection unit 815. Further, when the human body detection unit 812 detects at least a part of the human body, the operation restriction unit 816 causes the notification unit 82 to output an alarm according to the detection result of the state detection unit 815. Also, the operation restriction unit 816 restricts the operation of the tensile testing machine 1 when the human body detection unit 812 detects at least a part of the human body according to the determination result of the area determination unit 813. Further, when the human body detection unit 812 detects at least a part of the human body, the operation restriction unit 816 causes the notification unit 82 to output an alarm according to the determination result of the area determination unit 813. Furthermore, the operation restriction unit 816 restricts the operation of the tensile testing machine 1 when the human body detection unit 812 detects at least a part of the human body according to the detection result of the door detection unit 814. Further, when the human body detection unit 812 detects at least a part of the human body, the operation restriction unit 816 causes the notification unit 82 to output an alarm according to the detection result of the door detection unit 814. A specific example of the operation of the operation restriction unit 816 will be described later with reference to FIG. 6.

[0040] In this embodiment, the case where the tensile testing machine 1 is provided with the camera 6 will be described, but it is not limited thereto. It is sufficient that the tensile testing machine 1 and the camera 6 are communicably connected. For example, the material testing system may include the tensile testing machine 1 and an imaging device having the camera 6, and the tensile testing machine 1 and the imaging device may be communicably connected via a USB (Universal Serial Bus) cable or a LAN (Local Area Network) cable. The tensile testing machine 1 and the imaging device may be wirelessly communicably connected.

[0041] Also, when the material testing system includes a tensile testing machine 1 and an imaging device having a camera 6, the imaging device may include a human body detection unit 812. That is, the imaging device includes a processor such as a CPU or MPU, and a memory device such as a ROM or RAM, and the processor may function as the human body detection unit 812 by executing a control program stored in the memory device. Further, the processor of the imaging device may function as a region determination unit 813.

[0042] [4. Specific Examples of Processing of Key Parts of Safety Devices] FIG. 4 is a diagram showing an example of a human body detection method of the human body detection unit 812. In this embodiment, the human body detection unit 812 has previously learned images of human body parts by machine learning or the like to generate a learned model MD. As shown in the left diagram of FIG. 4, the human body detection unit 812 divides the image P into S×S regions to generate an image P1. S is, for example, 7.

[0043] Next, as shown in the upper middle diagram of FIG. 4, the human body detection unit 812 detects a plurality of boundary lines based on the color information of each pixel constituting the image P1 in each of the S×S regions of the image P1 to generate an image P2. Then, the human body detection unit 812 calculates the reliability that at least a part of the human body is included within the detected boundary using the learned model MD. Also, as shown in the lower middle diagram of FIG. 4, the human body detection unit 812 calculates the probability that at least a part of the human body is included within the region in each of the S×S regions of the image P1 using the learned model MD. In the image P3 shown in the lower middle diagram of FIG. 4, the higher the probability that at least a part of the human body is included within the region, the darker the hatching is shown. For example, the region P31 indicates the region with the highest probability of including at least a part of the human body, and the region P32 indicates the region with the second highest probability of including at least a part of the human body.

[0044] The human body detection unit 812 integrates the reliability of including at least a part of the human body within the boundary shown in the upper figure of FIG. 4 and the probability of including at least a part of the human body within the area shown in the lower figure of FIG. 4 to calculate a reliability score. When the reliability score exceeds a threshold value, it is determined that at least a part of the human body has been detected. The right figure of FIG. 4 shows an image P4 indicating that at least a part of the human body has been detected in the area P41.

[0045] FIG. 5 is a screen diagram showing an example of the first area AR1, the second area AR2, and the third area AR3. The image PA shown in FIG. 5 shows an example of the image P acquired by the image acquisition unit 811. As shown in FIG. 5, the image PA includes images corresponding to the test specimen TP, the upper gripper 21, the lower gripper 22, the screw shafts 28, 29, the cross head 10, and the table 26, which were described with reference to FIG. 1.

[0046] The area determination unit 813 determines whether the human body detection unit 812 has detected at least a part of the human body in the first area AR1, determines whether the human body detection unit 812 has detected at least a part of the human body in the second area AR2, and determines whether the human body detection unit 812 has detected at least a part of the human body in the third area AR3. As shown in FIG. 5, the first area AR1 includes, for example, images corresponding to the test specimen TP, the upper gripper 21, and the lower gripper 22. That is, the first area AR1 is the area with the highest risk when performing a tensile test on the tensile testing machine 1.

[0047] As shown in FIG. 5, the second area AR2 is, for example, an area outside the first area AR1 and includes an image corresponding to the test machine main body 2. That is, the second area AR2 is the area with the second highest risk when performing a tensile test on the tensile testing machine 1. As shown in FIG. 5, the third area AR3 is, for example, an area outside the second area AR2. That is, the third area AR3 is the area with the lowest risk when performing a tensile test on the tensile testing machine 1.

[0048] In this embodiment, the region determination unit 813 divides the image PA into three regions and determines whether the human body detection unit 812 has detected at least a part of the human body in each region, but it is not limited thereto. The region determination unit 813 may divide the image PA into two or more regions and determine whether the human body detection unit 812 has detected at least a part of the human body in each region. For example, the region determination unit 813 may divide the image PA into two regions and determine whether the human body detection unit 812 has detected at least a part of the human body in each region. Further, the region determination unit 813 may divide the image PA into four or more regions and determine whether the human body detection unit 812 has detected at least a part of the human body in each region.

[0049] FIG. 6(A) is a chart showing an example of the content of operation regulation and warning determined according to the region where at least a part of the human body is detected and the state of the tensile testing machine 1. The leftmost column of the chart shown in FIG. 6(A) indicates the state ST of the tensile testing machine 1. The state ST includes a standby state ST1, a preparation state ST2, and an execution state ST3. The second column from the left shows the content of operation regulation and warning of the operation regulation unit 816 under the first condition CA1. The first condition CA1 corresponds to the case where the human body detection unit 812 has detected at least a part of the human body in the first region AR1. The third column from the left shows the content of operation regulation and warning of the operation regulation unit 816 under the second condition CA2. The second condition CA2 corresponds to the case where the human body detection unit 812 has detected at least a part of the human body in the second region AR2. The rightmost column shows the content of operation regulation and warning of the operation regulation unit 816 under the third condition CA3. The third condition CA3 corresponds to the case where the human body detection unit 812 has detected at least a part of the human body in the third region AR3.

[0050] As shown in FIG. 6(A), in the standby state ST1, in the first condition CA1 and the second condition CA2, the operation regulation unit 816 causes the notification unit 82 to output a warning, and in the third condition CA3, does not output a warning. As the warning, for example, a rotating light is lit. In the preparation state ST2, in the first condition CA1 and the second condition CA2, the operation control unit 816 restricts the tensile testing machine 1 to the "safe operation mode", causes the notification unit 82 to output an alarm, and in the third condition CA3, causes the notification unit 82 to output an alarm. In the "safe operation mode", the operation control unit 816 restricts, for example, the moving speed of the crosshead 10 to be equal to or lower than a preset maximum speed, and prohibits shifting to the implementation state ST3.

[0051] In the implementation state ST3, in the first condition CA1 and the second condition CA2, the operation control unit 816 stops the operation of the tensile testing machine 1 and causes the notification unit 82 to output a strong alarm, and in the third condition CA3, causes the notification unit 82 to output an alarm. As a strong alarm, for example, a rotating light blinks and a voice notifying danger is output from a speaker.

[0052] As shown in FIG. 6(A), the operation control unit 816 can appropriately regulate the operation of the tensile testing machine 1 because it regulates the operation of the tensile testing machine 1 according to the state ST of the tensile testing machine 1 and the area where the human body detection unit 812 has detected at least a part of the human body.

[0053] In the present embodiment, the operation control unit 816 restricts the moving speed of the crosshead 10 to be equal to or lower than a preset maximum speed, but is not limited thereto. The operation control unit 816 may regulate the moving acceleration of the crosshead 10, may stop the movement of the crosshead 10, may stop the servo motor 18, or may stop the power supply to the servo motor 18. Electric power corresponds to an example of a "driving source".

[0054] The leftmost column of the chart shown in FIG. 6(B) indicates the state ST of the tensile testing machine 1. The state ST includes a first implementation state ST31 and a second implementation state ST32. The first implementation state ST31 indicates a state in which the safety door 7 is open in the implementation state ST3, and the second implementation state ST32 indicates a state in which the safety door 7 is closed in the implementation state ST3. The second column from the left shows the restrictions and warnings of the operation restriction unit 816 under the first condition CA1. The third column from the left shows the restrictions and warnings of the operation restriction unit 816 under the second condition CA2. The rightmost column shows the restrictions and warnings of the operation restriction unit 816 under the third condition CA3.

[0055] As shown in FIG. 6(B), in the first implementation state ST31, under the first condition CA1 and the second condition CA2, the operation restriction unit 816 stops the operation of the tensile testing machine 1 and outputs a strong warning to the notification unit 82. Under the third condition CA3, the operation restriction unit 816 stops the operation of the tensile testing machine 1 and outputs a warning to the notification unit 82. In the second implementation state ST32, under the first condition CA1, the operation restriction unit 816 stops the operation of the tensile testing machine 1 and outputs a strong warning to the notification unit 82. Under the second condition CA2, the operation restriction unit 816 outputs a strong warning to the notification unit 82. Under the third condition CA3, the operation restriction unit 816 outputs a warning to the notification unit 82.

[0056] As shown in FIG. 6(B), the operation restriction unit 816 restricts the operation of the tensile testing machine 1 according to the region where the human body detection unit 812 detects at least a part of the human body and whether the safety door 7 is in the closed state, so that the operation of the tensile testing machine 1 can be properly restricted.

[0057] [5. Processing of the control unit 81 of the safety control device 8] Next, with reference to FIG. 7, the processing of the control unit 81 of the safety control device 8 will be described. FIG. 7 is a flowchart showing an example of the processing of the control unit 81 of the safety control device 8. First, as shown in FIG. 7, in step S101, the image acquisition unit 811 causes the camera 6 to image the imaging range θ including the movable part of the test machine body 2 to generate an image P, and acquires the generated image P. Next, in step S103, the human body detection unit 812 detects at least a part of the human body based on the image P acquired by the image acquisition unit 811. Next, in step S105, the control unit 81 determines whether the human body detection unit 812 has detected at least a part of the human body. When the control unit 81 determines that the human body detection unit 812 has not detected at least a part of the human body (step S105; NO), the process returns to step S101. When the control unit 81 determines that the human body detection unit 812 has detected at least a part of the human body (step S105; YES), the process proceeds to step S107. Then, in step S107, the area determination unit 813 determines whether the area where the human body detection unit 812 has detected at least a part of the human body is the first area AR1, the second area AR2, or the third area AR3 in the imaging area of the camera 6.

[0058] Next, in step S109, the state detection unit 815 detects the state ST of the tensile testing machine 1. The state ST of the tensile testing machine 1 is composed of a standby state ST1, a preparation state ST2, and an execution state ST3. Next, in step S111, the door detection unit 814 detects whether the safety door 7 is in a closed state. Next, in step S113, the operation restriction unit 816 restricts the operation of the tensile testing machine 1 according to the detection result of the state detection unit 815, the determination result of the area determination unit 813, and the detection result of the door detection unit 814. Next, in step S115, the operation restriction unit 816 causes the notification unit 82 to output an alarm according to the detection result of the state detection unit 815, the determination result of the area determination unit 813, and the detection result of the door detection unit 814. Next, in step S117, the control unit 81 determines whether to end the tensile test. Here, ending the tensile test means, for example, turning off the power of the tensile testing machine 1. That is, ending the tensile test means ending the tensile test and not performing the tensile test for a predetermined period or more. The predetermined period is, for example, 12 hours. When the control unit 81 determines not to end the tensile test (step S117; NO), the process returns to step S101. When the control unit 81 determines to end the tensile test (step S117; YES), the process ends.

[0059] [7. Aspect and Effect] Those skilled in the art will understand that the above-described embodiments and modifications are specific examples of the following aspects.

[0060] (Item 1) A strain material testing device according to one aspect is a material testing device that deforms a specimen and measures mechanical properties of the specimen, including an imaging unit that generates an image including a movable part of the material testing device or the vicinity of the material testing device, a human body detection unit that detects at least a part of a human body based on the image, a state detection unit that detects a state of the material testing device, and an operation regulation unit that regulates an operation of the material testing device when the human body detection unit detects at least a part of the human body according to a detection result of the state detection unit.

[0061] According to the material testing device described in Item 1, the operation of the material testing device when the human body detection unit detects at least a part of the human body is regulated according to the state of the material testing device. Therefore, according to the state of the material testing device, the operation of the material testing device when the human body detection unit detects at least a part of the human body can be regulated.

[0062] (Item 2) In the material testing device according to Item 1, the state of the material testing device includes a standby state, a preparation state, and an execution state.

[0063] According to the material testing device described in Item 2, the state of the material testing device includes a standby state, a preparation state, and an execution state. Therefore, according to each of the standby state, the preparation state, and the execution state, the operation of the material testing device when the human body detection unit detects at least a part of the human body can be regulated.

[0064] (Item 3) In the material testing device according to Item 1 or Item 2, the regulation of the operation of the material testing device includes at least one of regulation of the speed of an actuator of the material testing device, regulation of the acceleration of the actuator, stopping of the actuator, and stopping of a drive source of the actuator.

[0065] According to the material testing apparatus described in claim 3, the regulation of the operation of the material testing apparatus includes at least one of the regulation of the speed of the actuator of the material testing apparatus, the regulation of the acceleration of the actuator, the stop of the actuator, and the stop of the drive source of the actuator. Therefore, according to the state of the material testing apparatus, for example, the speed of the actuator of the material testing apparatus can be regulated, or the actuator can be stopped. Thus, the operation of the material testing apparatus when the human body detection unit detects at least a part of the human body can be properly regulated.

[0066] (Claim 4) In the material testing apparatus according to any one of claims 1 to 3, when the human body detection unit detects at least a part of the human body, a region determination unit that determines whether the human body detection unit detects at least a part of the human body in a specific region among the imaging regions of the imaging unit is provided, and the operation regulation unit regulates the operation of the material testing apparatus when the human body detection unit detects at least a part of the human body according to the determination result of the region determination unit.

[0067] According to the material testing apparatus described in claim 4, the operation of the material testing apparatus is regulated according to whether the human body detection unit detects at least a part of the human body in a specific region. Therefore, the operation of the material testing apparatus can be properly regulated according to whether the human body detection unit detects at least a part of the human body in a specific region. For example, when the human body detection unit detects at least a part of the human body in a specific region, the operation of the material testing apparatus can be more strongly regulated compared to the case where the human body detection unit detects at least a part of the human body in a region other than the specific region.

[0068] (Claim 5) In the material testing apparatus according to any one of claims 1 to 4, a door detection unit that detects whether a safety door that prohibits entry into the material testing apparatus is in a closed state is provided, and the operation regulation unit regulates the operation of the material testing apparatus when the human body detection unit detects at least a part of the human body according to the detection result of the door detection unit.

[0069] According to the material testing apparatus described in claim 5, when the safety door is in a closed state or not, the operation of the material testing apparatus when the human body detection unit detects at least a part of the human body is restricted. Therefore, depending on whether the safety door is in a closed state or not, the operation of the material testing apparatus when the human body detection unit detects at least a part of the human body can be appropriately restricted. For example, when the safety door is in an open state, the operation of the material testing apparatus can be restricted more strongly compared to when the safety door is in a closed state.

[0070] (Claim 6) A material testing system according to one aspect includes a material testing apparatus that deforms a specimen and measures mechanical properties of the specimen, and an imaging apparatus that is communicably connected to the material testing apparatus and generates an image including a movable part of the material testing apparatus or the vicinity of the material testing apparatus. The material testing apparatus or the imaging apparatus includes a human body detection unit that detects at least a part of the human body based on the image. The material testing apparatus includes a state detection unit that detects a state of the material testing apparatus, and an operation restriction unit that restricts the operation of the material testing apparatus when the human body detection unit detects at least a part of the human body according to a detection result of the state detection unit.

[0071] According to the material testing system described in claim 6, the same effects as those of the material testing apparatus described in claim 1 are achieved.

[0072] [8. Other Embodiments] Note that the tensile testing machine 1 according to the present embodiment is merely an example of an aspect of the material testing apparatus according to the present invention, and can be arbitrarily modified and applied without departing from the gist of the present invention. For example, in the present embodiment, the case where the material testing apparatus is the tensile testing machine 1 has been described, but the present invention is not limited to this. The material testing apparatus may apply a test force to the specimen TP and deform the specimen TP to perform a material test. For example, the material testing apparatus may be a compression testing machine, a bending testing machine, or a torsion testing machine. Further, for example, the material testing apparatus may be a fatigue testing machine or an environmental testing machine.

[0073] In addition, in the present embodiment, the state ST of the tensile testing machine 1 includes a standby state ST1, a preparation state ST2, and an execution state ST3. However, the state ST of the tensile testing machine 1 only needs to include at least the preparation state ST2 and the execution state ST3.

[0074] In addition, in the present embodiment, the processor 81A of the control unit 81 of the safety control device 8 functions as an image acquisition unit 811, a human body detection unit 812, a region determination unit 813, a door detection unit 814, a state detection unit 815, and an operation restriction unit 816. However, the present embodiment is not limited thereto. The control circuit unit 50 may function as at least one of the image acquisition unit 811, the human body detection unit 812, the region determination unit 813, the door detection unit 814, the state detection unit 815, and the operation restriction unit 816. For example, the control circuit unit 50 may function as the image acquisition unit 811, the human body detection unit 812, the region determination unit 813, the door detection unit 814, the state detection unit 815, and the operation restriction unit 816.

[0075] In addition, each functional unit shown in FIG. 3 shows a functional configuration, and the specific implementation form is not particularly limited. That is, it is not necessarily required that hardware corresponding to each functional unit be individually mounted. Of course, it is also possible to adopt a configuration in which one processor executes a program to realize the functions of a plurality of functional units. Further, a part of the functions realized by software in the above embodiment may be realized by hardware, or a part of the functions realized by hardware may be realized by software.

[0076] In addition, the processing units of the flowchart shown in FIG. 7 are divided according to the main processing contents in order to facilitate the understanding of the processing of the control unit 81 of the safety control device 8. The processing unit division method and name shown in the flowchart of FIG. 7 are not limited, and according to the processing contents, it can be further divided into more processing units, or one processing unit can be divided to include more processing. Further, the processing order of the above flowchart is not limited to the illustrated example.

[0077] In this embodiment, the processor 81A included in the safety control device 8 is caused to execute a control program, thereby functioning as an image acquisition unit 811, a human body detection unit 812, a region determination unit 813, a door detection unit 814, a state detection unit 815, and an operation restriction unit 816. Further, this control program can also be recorded on a recording medium that is readable by a computer. As the recording medium, a magnetic or optical recording medium or a semiconductor memory device can be used. Specifically, portable or fixed recording media such as a flexible disk, HDD, CD-ROM (Compact Disk Read Only Memory), DVD, Blu-ray (registered trademark) Disc, magneto-optical disk, flash memory, card-type recording media, etc. can be mentioned. Further, the recording medium may be a non-volatile storage device such as a RAM, ROM, HDD, etc., which is an internal storage device included in the image processing device. Further, the control program may be stored in a server device or the like, and the control program may be downloaded from the server device to the safety control device 8.

Explanation of Signs

[0078] 1 Tensile testing machine (material testing device) 2 Testing machine main body 4 Control unit 6 Camera (imaging unit, imaging device) 10 Crosshead (movable part) 12 Loading mechanism 14 Load cell 18 Servo motor (actuator) 20 Rotary encoder 21 Upper gripper (movable part) 22 Lower gripper (movable part) 26 Table 28, 29 Screw table (movable part) 30 Overall control device 32 Display device 34 Test program execution device 40 Signal input / output unit 42 Sensor amplifier 43 Counter circuit 44 Servo amplifier 50 Control Circuit Unit 200 Detection Device 8 Detection Control Device 81 Control Unit 81A Processor 81B Memory Device 82 Notification Unit 83 Communication Unit 811 Image Acquisition Unit 812 Human Body Detection Unit 813 Region Determination Unit 814 Door Detection Unit 815 State Detection Unit 816 Operation Restriction Unit AR1 First Region (Specific Region) AR2 Second Region AR3 Third Region CA1 First Condition CA2 Second Condition CA3 Third Condition MD Trained Model P Image S Sensor ST State ST1 Standby State ST2 Preparation State ST3 Execution State TP Specimen

Claims

1. A material testing apparatus that deforms a specimen and measures the mechanical properties of the specimen, comprising: An imaging unit that generates an image including a movable part of the material testing apparatus or the vicinity of the material testing apparatus; A human body detection unit that detects at least a part of a human body based on the image; A state detection unit that detects the state of the material testing apparatus; An operation regulation unit that regulates the operation of the material testing apparatus when the human body detection unit detects at least a part of the human body according to the detection result of the state detection unit; and The state of the material testing apparatus includes a standby state, a preparation state, and an execution state.

2. The regulation of the operation of the material testing apparatus includes at least one of regulating the speed of an actuator of the material testing apparatus, regulating the acceleration of the actuator, stopping the actuator, and stopping a drive source of the actuator. The material testing apparatus according to claim 1.

3. When the human body detection unit detects at least a part of the human body, it is provided with a region determination unit that determines whether the human body detection unit detects at least a part of the human body in a specific region among the imaging regions of the imaging unit. The operation regulation unit regulates the operation of the material testing apparatus when the human body detection unit detects at least a part of the human body according to the determination result of the region determination unit. The material testing apparatus according to claim 1 or claim 2.

4. It is provided with a door detection unit that detects whether a safety door that prohibits entry into the material testing apparatus is in a closed state. The operation regulation unit regulates the operation of the material testing apparatus when the human body detection unit detects at least a part of the human body according to the detection result of the door detection unit. The material testing apparatus according to any one of claims 1 to 3.

5. When the human body detection unit detects at least a part of the human body, among a plurality of regions set according to the degree of danger in the imaging region of the imaging unit, a region determination unit that determines in which region the human body detection unit has detected at least a part of the human body is provided. The operation restriction unit restricts the operation of the material testing apparatus when the human body detection unit detects at least a part of the human body according to the determination result of the region determination unit. The material testing apparatus according to any one of Claims 1, 2, and 4.

6. The operation restriction unit restricts the operation of the material testing apparatus when the human body detection unit detects at least a part of the human body according to the determination result of the region determination unit and the detection result of the state detection unit. The material testing apparatus according to Claim 5.

7. A material testing system including a material testing apparatus that deforms a specimen and measures mechanical properties of the specimen, and an imaging apparatus communicably connected to the material testing apparatus and generating an image including a movable part of the material testing apparatus or the vicinity of the material testing apparatus. The material testing apparatus or the imaging apparatus includes a human body detection unit that detects at least a part of the human body based on the image. The material testing apparatus includes a state detection unit that detects the state of the material testing apparatus, and an operation restriction unit that restricts the operation of the material testing apparatus when the human body detection unit detects at least a part of the human body according to the detection result of the state detection unit. is provided with A material testing system, wherein the state of the material testing apparatus includes a standby state, a preparation state, and an execution state.

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