Thermal protector and thermal protector ST parameter testing device

Abstract

The utility model relates to a thermal protector and a thermal protector ST parameter testing device, which are mainly used for over-temperature rise and over-current protection of a refrigeration compressor or other motors. The thermal protector comprises a pin, a cover plate, a movable contact spring, a bimetallic strip, a first static pin, a second static pin, a heating body, a third static pin and a base, two ends of the heating body are respectively welded with the first static pin and the second static pin, one end of the movable contact spring is electrically connected with the first static pin, the other end of the movable contact spring is matched with the third static pin, and the bimetallic strip is arranged on the base. One end of the movable contact spring is electrically connected with the first static pin, the other end of the movable contact spring is electrically connected with the second static pin, the pin is electrically connected with the third static pin, and when the other end of the movable contact spring is in contact with the third static pin, the second static pin, the heating body, the first static pin, the movable contact spring, the third static pin and the pin sequentially form an electric loop. The platform is provided with a cavity used for limiting the bimetallic strip in the radial direction, and the cover plate is provided with a limiting column used for limiting the bimetallic strip in the axial direction.

Description

Technical Field

[0001] The utility model relates to a thermal protector and a thermal protector ST parameter testing device, which are mainly used for over-temperature rise and over-current protection of a refrigeration compressor or other motors. Background Art

[0002] At present, a thermal protector is equipped for each refrigeration compressor, and the thermal protector is mainly used for over-temperature rise and over-current protection of the refrigeration compressor. The thermal protector in the prior art forms a protective circuit that is electrically connected normally and disconnected abnormally through a pin, a static foot three-component (including a contact), a moving reed component (including a contact), and a heating element component; the thermal protector is provided with a heating element and a bimetallic strip. When the refrigerator compressor is blocked or the voltage is unstable, the current becomes larger. When the heat generated by passing through the heating element reaches the action temperature set by the bimetallic strip, the thermal protector can act to disconnect the electrical circuit. When the thermal protector reaches the set recovery temperature, the bimetallic strip can reset and continue to connect the electrical circuit.

[0003] In the thermal protector in the prior art, a limiting post for limiting the bimetallic strip 4 is not provided inside the cover plate 2, which results in a large activity space between the top of the cover plate 2 and the bimetallic strip 4. When the heat energy generated by the current passing through the heating element 7 reaches the bimetallic strip 4 to make a sudden jump, the time required is called the disconnection time.

[0004] In Figure 5 the direction shown for testing the disconnection time and changing to Figure 6 the direction shown for testing the disconnection time, due to the large activity space of the bimetallic strip 4 in the prior art, the distance L between the bimetallic strip 4 falling off the platform 9-1 and the heating element 7 becomes larger. Therefore, in these two different directions of testing methods, the disconnection time difference is large when the bimetallic strip 4 is in a displaced state. Therefore, fluctuations may occur in different directions of testing, resulting in the accuracy of the test determination.

[0005] Currently, when testing the disconnection time, it is necessary to manually place the product to be tested at a specified position for testing. When placing the product, the orientation needs to be confirmed first before putting the product into the multi-station tooling, and then the switch is started for testing. After the test is completed, the qualified products and unqualified products are identified and distinguished manually. Once misoperation occurs during the classification, the qualified products and unqualified products are confused, resulting in quality accidents and causing adverse consequences. Due to manual operation, the production efficiency is low and the cost is high. Content of the Utility Model

[0006] The purpose of the utility model is to overcome the above deficiencies existing in the prior art, and to provide a thermal protector and a thermal protector ST parameter testing device with reasonable structural design.

[0007] The technical solution adopted by the present utility model to solve the above problems is as follows: The thermal protector includes pins, a cover plate, a moving reed, a bimetal sheet, a static pin 1, a static pin 2, a heating element, a static pin 3, and a base. The two ends of the heating element are respectively welded to the static pin 1 and the static pin 2. One end of the moving reed is electrically connected to the static pin 1, and the other end of the moving reed cooperates with the static pin 3. The pin is electrically connected to the static pin 3. When the other end of the moving reed contacts the static pin 3, the static pin 2, the heating element, the static pin 1, the moving reed, the static pin 3, and the pin form an electrical circuit in sequence. Its structural feature is that: a platform for axially limiting the bimetal sheet is arranged on the base, a cavity for radially limiting the bimetal sheet is arranged on the platform, and a limiting post for axially limiting the bimetal sheet is arranged on the cover plate.

[0008] Further, the number of the limiting posts is two. The two limiting posts are respectively a limiting post 1 and a limiting post 2. The center distance between the limiting post 1 and the limiting post 2 is L1, and the value range of L1 is 12.8 - 13.2 mm.

[0009] Further, the two limiting posts have equal height and are both H1, and the value range of H1 is 2.2 - 2.3 mm.

[0010] Further, a chamfer α is arranged at the end of the limiting post, and the value range of α is 45 - 50°.

[0011] Further, the pin is arranged on the cover plate, and the moving reed, the bimetal sheet, the static pin 1, the static pin 2, the heating element, and the static pin 3 are all arranged in the cavity formed by the cover plate and the base.

[0012] Further, the heating element, the bimetal sheet, and the moving reed are arranged in sequence from bottom to top.

[0013] Further, another technical object of the present utility model is to provide a thermal protector ST parameter testing device for a thermal protector.

[0014] The above technical object of the present utility model is achieved through the following technical solutions.

[0015] A thermal protector ST parameter testing device for a thermal protector includes a conveyor belt. Its structural feature is that: it further includes a clamping and flipping mechanism, a manipulator feeding mechanism, and a testing mechanism. The clamping and flipping mechanism is located at the output end of the conveyor belt, and the clamping and flipping mechanism cooperates with the manipulator feeding mechanism. The manipulator feeding mechanism cooperates with the testing mechanism. The testing mechanism includes a vertical testing mechanism and a horizontal testing mechanism.

[0016] Further, the clamping and flipping mechanism includes a fixed seat, a flipping seat, clamping feet, a flipping motor, and a clamping cylinder. The flipping seat is arranged on the fixed seat and is driven by the flipping motor. The clamping cylinder is arranged on the flipping seat, and the clamping feet are driven by the clamping cylinder.

[0017] Further, the manipulator feeding mechanism includes a manipulator and a gripper, and the gripper is arranged at the end of the manipulator.

[0018] Further, the vertical testing mechanism includes a vertical testing cylinder, a vertical testing needle seat, vertical testing needles, and a vertical testing fixture. The vertical testing needles are arranged on the vertical testing needle seat, the vertical testing needle seat is driven by the vertical testing cylinder, and the vertical testing fixture is used for placing vertically placed products to be tested.

[0019] Further, the horizontal testing mechanism includes a horizontal testing cylinder, a horizontal testing needle seat, horizontal testing needles, and a horizontal testing fixture. The horizontal testing needles are arranged on the horizontal testing needle seat, the horizontal testing needle seat is driven by the horizontal testing cylinder, and the horizontal testing fixture is used for placing horizontally placed products to be tested.

[0020] Compared with the prior art, the present utility model has the following advantages: By arranging the first limit post and the second limit post on the cover plate of the thermal protector, the distance H2 between the limit posts and the platform can be reduced. Therefore, whether using the Figure 5 (positive) test method for testing or Figure 6 (reverse) test method for testing, since the movement and change of the bimetal sheet in space are extremely small, the distance H3 between the bimetal sheet and the heating element can be kept stable, achieving the accuracy of test determination in different directions. That is, the disconnection time test of the thermal protector can be realized in multiple directions, and the measured disconnection time is relatively stable.

[0021] That is to say, by arranging the first limit post and the second limit post on the cover plate of the thermal protector, the cavity distance between the tops of the first limit post and the second limit post and the platform is reduced to a spatial distance H2 that can only meet the jump variable of the bimetal sheet, so as to keep the distance H3 between the bimetal sheet and the heating element stable, thus achieving the accuracy of test determination in different directions. By replacing manual detection with automatic equipment detection, the production efficiency is greatly improved, the problems caused by manual operation errors are avoided, and the labor cost is reduced at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a three-dimensional structural schematic diagram of the thermal protector according to an embodiment of the present utility model.

[0023] Figure 2 is an exploded structural schematic diagram of the thermal protector according to an embodiment of the present utility model.

[0024] Figure 3 It is a schematic internal structure diagram of the thermal protector according to an embodiment of the present utility model.

[0025] Figure 4 It is a schematic three-dimensional structure diagram of the cover plate according to an embodiment of the present utility model.

[0026] Figure 5 It is a schematic cross-sectional structure diagram of the thermal protector (forward) according to an embodiment of the present utility model.

[0027] Figure 6 It is a schematic cross-sectional structure diagram of the thermal protector (reverse) according to an embodiment of the present utility model.

[0028] Figure 7 It is a schematic three-dimensional structure diagram of the ST parameter test device of the thermal protector (vertical test mode, horizontal test mode, feeding of the product to be tested) according to an embodiment of the present utility model.

[0029] Figure 8 It is a schematic three-dimensional structure diagram of the ST parameter test device of the thermal protector (vertical test mode, picking of the product to be tested) according to an embodiment of the present utility model.

[0030] Figure 9 It is a schematic three-dimensional structure diagram of the ST parameter test device of the thermal protector (vertical test mode, placing of the test product) according to an embodiment of the present utility model.

[0031] Figure 10 It is a schematic three-dimensional structure diagram of the ST parameter test device of the thermal protector (horizontal test mode, picking of the product to be tested) according to an embodiment of the present utility model.

[0032] Figure 11 It is a schematic three-dimensional structure diagram of the ST parameter test device of the thermal protector (horizontal test mode, placing of the test product) according to an embodiment of the present utility model.

[0033] Figure 12 It is a schematic three-dimensional structure diagram of the clamping and flipping mechanism according to an embodiment of the present utility model.

[0034] Figure 13 It is a schematic three-dimensional structure diagram of the vertical test mechanism according to an embodiment of the present utility model.

[0035] Figure 14 It is a schematic three-dimensional structure diagram of the horizontal test mechanism according to an embodiment of the present utility model.

[0036] Figure 15 It is a schematic three-dimensional structure diagram of the bimetallic strip according to an embodiment of the present utility model.

[0037] In the figure: pin 1, cover plate 2, moving reed 3, bimetallic strip 4, first static pin 5, second static pin 6, heating element 7, third static pin 8, base 9

[0038] The first limiting post 2-1 and the second limiting post 2-2

[0039] The platform 9-1 and the cavity 9-2

[0040] The conveyor belt A, the clamping and flipping mechanism B, the manipulator feeding mechanism C, and the testing mechanism D

[0041] The fixed seat B1, the flipping seat B2, the clamping feet B3, the flipping motor B4, and the clamping cylinder B5

[0042] The manipulator C1 and the gripper C2

[0043] The vertical testing mechanism D1 and the horizontal testing mechanism D2

[0044] The vertical testing cylinder D11, the vertical testing needle seat D12, the vertical testing needle D13, and the vertical testing fixture D14

[0045] The horizontal testing cylinder D21, the horizontal testing needle seat D22, the horizontal testing needle D23, and the horizontal testing fixture D24

[0046] The first sensor SQ1, the second sensor SQ2, the third sensor SQ3, the fourth sensor SQ4, the fifth sensor SQ5, the sixth sensor SQ6, the seventh sensor SQ7, the eighth sensor SQ8, and the ninth sensor SQ9 Specific implementation mode

[0047] The following further elaborates on the present utility model in detail with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present utility model, and the present utility model is not limited to the following embodiments.

[0048] Embodiment

[0049] Refer to Figures 1 to 15 As shown, it should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present utility model. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, if terms such as "upper", "lower", "left", "right", "middle", and "one" are cited in this specification, they are only for the convenience of clear narration and are not used to limit the implementation scope of the present utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the implementable scope of the present utility model.

[0050] The thermal protector in this embodiment (such as Figures 1-6As shown in the figure, it includes a pin 1, a cover plate 2, a moving reed 3, a bimetal 4, a static pin one 5, a static pin two 6, a heating element 7, a static pin three 8 and a base 9. Both ends of the heating element 7 are welded to the static pin one 5 and the static pin two 6 respectively. One end of the moving reed 3 is electrically connected to the static pin one 5, and the other end of the moving reed 3 cooperates with the static pin three 8. The pin 1 is electrically connected to the static pin three 8. When the other end of the moving reed 3 contacts the static pin three 8, the static pin two 6, the heating element 7, the static pin one 5, the moving reed 3, the static pin three 8, and the pin 1 form an electrical circuit in sequence; that is, the contact point of the moving reed 3 and the contact point of the static pin three 8 can form an energized circuit that is electrically connected under normal conditions and disconnected under abnormal conditions.

[0051] In this embodiment, a platform 9-1 for axially limiting the bimetal 4 is provided on the base 9, a cavity 9-2 for radially limiting the bimetal 4 is provided on the platform 9-1, and a limiting post for axially limiting the bimetal 4 is provided on the cover plate 2; the platform 9-1, the cavity 9-2 and the limiting post cooperate with each other to limit the movement space of the bimetal 4.

[0052] In this embodiment, the number of the limiting posts is two, the two limiting posts are respectively a limiting post one 2-1 and a limiting post two 2-2, the center distance L1 between the limiting post one 2-1 and the limiting post two 2-2 ranges from 12.8 to 13.2 mm, preferably L1 is 13 mm, the two limiting posts have the same height and are both H1, the value range of H1 is 2.2 to 2.3 mm, preferably H1 is 2.2 mm, and a chamfer α is provided at the end of the limiting post, the value range of α is 45-50°, designing α to be 45° can cooperate with the arc surface formed after the bimetal 4 jumps, the two limiting posts are located above the platform 9-1 and inside the cavity 9-2, the distance H2 between the limiting post and the platform, and the distance H3 between the bimetal and the heating element

[0053] In this embodiment, the pin 1 is provided on the cover plate 2, the moving reed 3, the bimetal 4, the static pin one 5, the static pin two 6, the heating element 7, and the static pin three 8 are all arranged in the cavity formed by the cover plate 2 and the base 9, and the heating element 7, the bimetal 4 and the moving reed 3 are arranged in sequence from bottom to top.

[0054] This thermal protector is connected to the compressor through the three-core terminal of the compressor. Just insert the pin 1 into the three-core terminal of the compressor; at the same time, the connecting insert of the static pin two 6 is used for power connection; after inserting the starter into the three-core terminal of the compressor and making an electrical connection, it can be put into normal use. When the grid voltage is too high or too low or the refrigeration system fails, the bimetal 4 is heated and deformed, pushing the contact point of the moving reed 3 away from the contact point of the static pin three 8, and the thermal protector acts, thereby cutting off the above-mentioned protective circuit and playing a role in protecting the compressor motor.

[0055] In this embodiment, the ST parameter test device for the thermal protector for the thermal protector (such asFigures 7-14 As shown in Figures 7-14 , it includes a conveyor belt A, a clamping and flipping mechanism B, a manipulator feeding mechanism C, and a testing mechanism D. The clamping and flipping mechanism B is located at the output end of the conveyor belt A, and the clamping and flipping mechanism B cooperates with the manipulator feeding mechanism C, and the manipulator feeding mechanism C cooperates with the testing mechanism D. The testing mechanism D includes a vertical testing mechanism D1 and a horizontal testing mechanism D2. The function of the conveyor belt A is to place the thermal protector to be tested on the conveyor belt A as required and convey it to the designated position by the conveyor belt A.

[0056] In this embodiment, the clamping and flipping mechanism B includes a fixed seat B1, a flipping seat B2, clamping feet B3, a flipping motor B4, and a clamping cylinder B5. The flipping seat B2 is arranged on the fixed seat B1, and the flipping seat B2 is driven by the flipping motor B4. The clamping cylinder B5 is arranged on the flipping seat B2, and the clamping feet B3 are driven by the clamping cylinder B5. The clamping feet B3 and the clamping cylinder B5 are mechanically connected as a whole. The original position of the clamping feet B3 is in an open state and in a closed state during control, and flipping is realized through the shaft motor connection of the flipping motor B4. The control system can control the flipping motor B4 to drive the flipping seat B2 to flip arbitrarily within 0 degrees - 180 degrees. The original position of the flipping seat B2 is in a 90-degree state in the vertical placement test mode and in a 180-degree state in the horizontal placement test mode. The "control system" is a prior art, such as the measurement and control system and control method for testing the time parameters of thermal protectors disclosed in the patent application No. 202210575012.1.

[0057] In this embodiment, the manipulator feeding mechanism C includes a manipulator C1 and a gripper C2. The gripper C2 is arranged at the end of the manipulator C1. The manipulator feeding mechanism C can realize the movement of any position in the X-axis, Y-axis, and Z-axis directions within the designed area. A gripper C2 is designed at the end of the manipulator C1, and its original position is in an open state and in a closed state during control, that is, in the product grasping state. In this testing device, the manipulator feeding mechanism C realizes the feeding from the clamping and flipping mechanism B of the thermal protector to be tested and the feeding to the testing mechanism D, and also realizes the feeding from the testing mechanism D of the tested thermal protector and the discharging to the product classification area.

[0058] In this embodiment, the vertical testing mechanism D1 includes a vertical testing cylinder D11, a vertical testing needle seat D12, vertical testing needles D13, and a vertical testing fixture D14. The vertical testing needles D13 are arranged on the vertical testing needle seat D12, and the vertical testing needle seat D12 is driven by the vertical testing cylinder D11. The vertical testing fixture D14 is used to place the vertically placed product to be tested. The vertical testing needles D13, the vertical testing needle seat D12, and the vertical testing cylinder D11 are mechanically connected as a whole. Its original position is in a non-connected state and in a test-connected state when the vertical testing cylinder D11 acts.

[0059] The horizontal testing mechanism D2 includes a horizontal testing cylinder D21, a horizontal testing needle base D22, a horizontal testing needle D23, and a horizontal testing fixture D24. The horizontal testing needle D23 is arranged on the horizontal testing needle base D22. The horizontal testing needle base D22 is driven by the horizontal testing cylinder D21. The horizontal testing fixture D24 is used to place the horizontally placed product to be tested. The horizontal testing needle D23, the horizontal testing needle base D22, and the horizontal testing cylinder D21 are mechanically connected as a whole. Their original position is in a non-connected state, and when the horizontal testing cylinder D21 operates, it is in a test-connected state.

[0060] In this embodiment, the product classification and discharging area classifies and discharges qualified products and various defective products according to the test results of the tested thermal protectors, that is, there are respectively set a DT1 discharging hole position, a DT2 discharging hole position, a DT3 discharging hole position, a DT4 discharging hole position, and a qualified product discharging hole position.

[0061] Among them, the DT1 discharging hole position is used to place the tested products that do not meet the lower limit value DT1 of the action time, that is, the unqualified tested products with a short action time.

[0062] Among them, the DT2 discharging hole position is used to place the tested products that do not meet the upper limit value DT2 of the action time, that is, the unqualified tested products with a long action time.

[0063] Among them, the DT3 discharging hole position is used to place the tested products that do not meet the lower limit value DT3 of the reset time, that is, the unqualified tested products with a short reset time.

[0064] Among them, the DT4 discharging hole position is used to place the tested products that do not meet the upper limit value DT4 of the reset time, that is, the unqualified tested products with a long reset time.

[0065] Among them, the qualified product discharging hole position is used to place the tested products that meet the lower limit value DT1 of the action time, the upper limit value DT2 of the action time, the lower limit value DT3 of the reset time, and the upper limit value DT4 of the reset time, that is, the qualified tested products.

[0066] The testing method of the thermal protector ST parameter testing device in this embodiment is as follows:

[0067] S1. Set the X-axis, Y-axis, and Z-axis running parameters of each position of the manipulator feeding mechanism C. Its positions include the material taking position of the product to be tested, the test product placing position of the vertical testing mechanism D1, the test product placing position of the horizontal testing mechanism D2, the test qualified product discharging position, and the discharging positions of various test defective items.

[0068] S2. Set the running parameters of the flipping motor B4 of the clamping and flipping mechanism B at 0 degrees, 90 degrees, and 180 degrees.

[0069] S3. Set the test mode. The vertical testing mechanism D1 is used to implement the vertical placement test mode, and the horizontal testing mechanism D2 is used to implement the horizontal placement test mode.

[0070] S4. Set the electrical test parameters of the thermal protector, including the test current I, the lower limit value DT1 of the action time, the upper limit value DT2 of the action time, the lower limit value DT3 of the reset time, and the upper limit value DT4 of the reset time.

[0071] S5. Place the thermal protector to be tested on conveyor belt A and send it to the specified position by conveyor belt A. After the control system receives the conveying-in-place signal from the first sensor SQ1, it performs the next action control. The first sensor SQ1 is set at the end of conveyor belt A.

[0072] S6. The control system controls the rotation of the flipping motor B4, and the motor shaft of the flipping motor B4 drives the flipping seat B2 to flip to 0 degrees. After the control system confirms that the clamping assembly has flipped to 0 degrees, it performs the next action control.

[0073] S7. The control system controls the action of the clamping cylinder B5, and the clamping cylinder B5 controls the two clamping feet B3 to clamp the thermal protector to be tested. After the control system receives the clamping-in-place signal from the third sensor SQ3, it performs the next action. The third sensor SQ3 is set on the clamping cylinder B5.

[0074] S8. If the test device is set to the vertical placement test mode, the control system controls the rotation of the flipping motor B4, and the motor shaft of the flipping motor B4 drives the flipping seat B2 to flip to 90 degrees. At this time, the thermal protector to be tested is in the vertical placement state. After the control system confirms that the flipping seat B2 has flipped to 90 degrees, it performs the next action control.

[0075] S9. If the test device is set to the horizontal placement test mode, the control system controls the rotation of the flipping motor B4, and the motor shaft of the flipping motor B4 drives the flipping seat B2 to flip to 180 degrees. At this time, the thermal protector to be tested is in the horizontal placement state. After the control system confirms that the flipping seat B2 has flipped to 180 degrees, it performs the next action control.

[0076] S10. In the state of the vertical placement test mode or the horizontal placement test mode, after the flipping seat B2 has flipped to 90 degrees or 180 degrees, the control system controls the manipulator feeding mechanism C to run to the position of the clamped thermal protector, that is, the material taking position of the product to be tested. Then it controls the action of the air claw C2 to perform the grasping of the product to be tested. After receiving the grasping-in-place signal from the fifth sensor SQ5, it controls the clamping cylinder B5 to reset. After receiving the signal that the clamping feet B3 of the second sensor SQ2 have been reset, it performs the next action control. The fifth sensor SQ5 is set on the air claw C2, and the second sensor SQ2 is set on the clamping cylinder B5.

[0077] S11. If the testing device is set to the vertical testing mode, the control system controls the manipulator feeding mechanism C to run to the test piece placement position of the vertical testing mechanism D1. After confirming that it has run in place, the control proceeds to the next action.

[0078] S12. If the testing device is set to the horizontal testing mode, the control system controls the manipulator feeding mechanism C to run to the test piece placement position of the horizontal testing mechanism D2. After confirming that it has run in place, the control proceeds to the next action.

[0079] S13. The control system controls the air gripper C2 to reset. After receiving the signal from the fourth sensor SQ4 indicating that the air gripper C2 has released, it means that the test piece has been placed in the test piece placement position. Then the manipulator feeding mechanism C runs to the transfer position. The fourth sensor SQ4 is set on the air gripper C2.

[0080] S14. The control system controls the vertical testing cylinder D11 to act. After receiving the signal from the seventh sensor SQ7 indicating that the vertical testing needle D13 has reached the position, it means that the vertical testing needle D13 has been connected to the test piece, and the time parameter test of the thermal protector can be carried out. The seventh sensor SQ7 is set on the vertical testing cylinder D11.

[0081] S15. The control system controls the test power supply to energize the test piece according to the set test current I, and at the same time the timer starts to record the energization time. During the energization timing process, the real-time recorded action time DT5 is compared with the set action time upper limit value DT2. When DT5 > DT2 and the thermal protector has not disconnected, it is judged that the action time exceeds the upper limit, and the test ends.

[0082] With the heating of the heating element 7 in the thermal protector during the energization process, when the heat accumulates to a certain extent, the bimetallic strip 4 makes a sudden jump and disconnects the contact, causing the energization circuit to break, and the energization time recording stops. The recorded time is the action time DT5 of the measured thermal protector. The action time DT5 is compared with the set action time lower limit value DT1. When DT5 < DT1, it is judged that the action time exceeds the lower limit, and the test ends. If DT1 < DT5 < DT2, it is judged that the action time is qualified, and the test continues.

[0083] Then the reset time test starts, that is, the disconnection time is recorded. The real-time recorded reset time DT6 is compared with the set reset time upper limit value DT4. When DT6 > DT4 and the thermal protector has not been reset and connected, it is judged that the reset time exceeds the upper limit, and the test ends.

[0084] As the heating element 7 inside the thermal protector cools down and the internal temperature drops, when the temperature drops to a certain extent and the bimetallic strip 4 resets to connect the contacts, the disconnection timing stops at this time. The recorded disconnection timing value DT6 at this time is the reset time. The reset time DT6 is compared with the set lower limit value DT3 of the reset time. When DT6 < DT3, it is judged that the reset time is below the lower limit and the test ends. If DT3 < DT6 < DT4, it is judged that the reset time is qualified. Thus, one action / reset test cycle of the thermal protector ends.

[0085] S16. After one action / reset test cycle of the thermal protector ends, the control system controls the vertical test cylinder D11 to reset, that is, the vertical test needle D13 retracts to the non-connected state. After receiving the reset signal of the vertical test needle D13 from the sixth sensor SQ6, it indicates that the vertical test needle D13 has disconnected from the product under test, and the next action control can be performed. The sixth sensor SQ6 is set on the vertical test needle D13.

[0086] S17. The control system controls the manipulator C1 to run to the test product placement position. After confirming that it has run in place, it controls the air claw C2 to act. After receiving the grasping-in-place signal from the fifth sensor SQ5, it indicates that the product under test has been grasped, and the next action control can be performed. The fifth sensor SQ5 is set on the air claw C2.

[0087] S18. The control system controls the manipulator feeding mechanism C of the thermal protector to run to the corresponding product classification and unloading area according to the test result of the thermal protector. The classification items of the test result are: qualified, lower limit of action time, upper limit of action time, lower limit of reset time, upper limit of reset time. After confirming that it has run to the corresponding unloading position, the next action control is performed.

[0088] S19. The control system controls the air claw C2 to reset. After receiving the signal that the air claw C2 has released from the fourth sensor SQ4, it indicates that the product under test has been unloaded into the corresponding material box. Thus, the test cycle of one product ends.

[0089] S20. The above description is the test process of the vertical placement test mode. The test process of the horizontal placement test mode repeats S13 - S18.

[0090] Function of the first sensor SQ1: Detect whether the product on the conveyor belt A is conveyed in place.

[0091] Function of the second sensor SQ2: Detect whether the clamping foot B3 has reset in place, that is, the clamping foot B3 releases.

[0092] Function of the third sensor SQ3: Detect whether the clamping foot B3 has completed clamping the product, that is, the clamping foot B3 closes.

[0093] Function of the fourth sensor SQ4: Detect whether the air claw C2 has reset in place, that is, the product releases.

[0094] Function of the fifth sensor SQ5: Detect whether the gripper C2 has moved in place, that is, the product is grasped.

[0095] Function of the sixth sensor SQ6: Detect whether the vertical test cylinder D11 has reset in place, that is, the vertical test needle D13 is disconnected.

[0096] Function of the seventh sensor SQ7: Detect whether the vertical test cylinder D11 has moved in place, that is, the vertical test needle D13 is connected.

[0097] Function of the sixth sensor SQ8: Detect whether the horizontal test cylinder D21 has reset in place, that is, the horizontal test needle D23 is disconnected.

[0098] Function of the seventh sensor SQ9: Detect whether the horizontal test cylinder D21 has moved in place, that is, the horizontal test needle D23 is connected.

[0099] Figures 7-11 The dashed line in it indicates the motion state of the manipulator C1.

[0100] In addition, it should be noted that for the specific embodiments described in this specification, the shapes and names of the components can be different. The above content described in this specification is only an example of the structure of the present invention. Any equivalent changes or simple changes made according to the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Those skilled in the technical field to which the present invention belongs can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, as long as they do not deviate from the structure of the present invention or exceed the scope defined by this claim book, they should all fall within the protection scope of the present invention.

Claims

1. A thermal protector, comprising pins (1), a cover plate (2), a moving reed (3), a bimetal strip (4), a first static pin (5), a second static pin (6), a heating element (7), a third static pin (8) and a base (9). Both ends of the heating element (7) are welded to the first static pin (5) and the second static pin (6) respectively. One end of the moving reed (3) is electrically connected to the first static pin (5), and the other end of the moving reed (3) cooperates with the third static pin (8). The pin (1) is electrically connected to the third static pin (8). When the other end of the moving reed (3) contacts the third static pin (8), an electrical circuit is formed in sequence by the second static pin (6), the heating element (7), the first static pin (5), the moving reed (3), the third static pin (8), and the pin (1). It is characterized in that: A platform (9-1) is provided on the base (9), a cavity (9-2) is provided on the platform (9-1), and limit posts are provided on the cover plate (2).

2. The thermal protector according to claim 1, characterized in that: The number of the limit posts is two, which are respectively a first limit post (2-1) and a second limit post (2-2). The center distance between the first limit post (2-1) and the second limit post (2-2) is L1, and the value range of L1 is 12.8 - 13.2 mm.

3. The thermal protector according to claim 1, characterized in that: The two limit posts have the same height, both being H1, and the value range of H1 is 2.2 - 2.3 mm.

4. The thermal protector according to claim 1, wherein: A chamfer α is provided at the end of the limit post, and the value range of α is 45 - 50°.

5. The thermal protector according to claim 1, wherein: The pin (1) is provided on the cover plate (2), and the moving reed (3), the bimetal sheet (4), the first static pin (5), the second static pin (6), the heating element (7), and the third static pin (8) are all provided in the cavity formed by the cover plate (2) and the base (9).

6. The thermal protector according to claim 1, wherein: The heating element (7), the bimetal sheet (4), and the moving reed (3) are arranged in sequence from bottom to top.

7. A thermal protector ST parameter testing device for the thermal protector described in any one of claims 1-6, comprising a conveyor belt (A), characterized in that: It further includes a clamping and flipping mechanism (B), a manipulator feeding mechanism (C), and a testing mechanism (D). The clamping and flipping mechanism (B) is located at the output end of the conveyor belt (A), and the clamping and flipping mechanism (B) cooperates with the manipulator feeding mechanism (C). The manipulator feeding mechanism (C) cooperates with the testing mechanism (D). The testing mechanism (D) includes a vertical testing mechanism (D1) and a horizontal testing mechanism (D2).

8. The thermal protector ST parameter testing device according to claim 7, characterized in that: The clamping and flipping mechanism (B) includes a fixed seat (B1), a flipping seat (B2), clamping feet (B3), a flipping motor (B4), and a clamping cylinder (B5). The flipping seat (B2) is arranged on the fixed seat (B1) and is driven by the flipping motor (B4). The clamping cylinder (B5) is arranged on the flipping seat (B2), and the clamping feet (B3) are driven by the clamping cylinder (B5).

9. The thermal protector ST parameter testing device according to claim 7, wherein: The manipulator feeding mechanism (C) includes a manipulator (C1) and a gripper (C2), and the gripper (C2) is arranged at the end of the manipulator (C1).

10. The thermal protector ST parameter testing device according to claim 7, characterized in that: The vertical testing mechanism (D1) includes a vertical testing cylinder (D11), a vertical testing pin base (D12), vertical testing pins (D13), and a vertical testing fixture (D14). The vertical testing pins (D13) are arranged on the vertical testing pin base (D12), the vertical testing pin base (D12) is driven by the vertical testing cylinder (D11), and the vertical testing fixture (D14) is used to place the vertically placed product to be tested. The horizontal testing mechanism (D2) includes a horizontal testing cylinder (D21), a horizontal testing pin base (D22), horizontal testing pins (D23), and a horizontal testing fixture (D24). The horizontal testing pins (D23) are arranged on the horizontal testing pin base (D22), the horizontal testing pin base (D22) is driven by the horizontal testing cylinder (D21), and the horizontal testing fixture (D24) is used to place the horizontally placed product to be tested.

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