A thermal protector testing apparatus

Abstract

The present application relates to the technical field of thermal protector testing, and discloses a thermal protector testing device, which comprises a detection table and a protector to be tested, the protector to be tested having a protector main body and a protector lead wire led out from the protector main body, a heating box is arranged in the middle of the detection table, water baths are arranged on both sides of the heating box, the two water baths correspond to the upper limit and the lower limit of the nominal action temperature of the protector to be tested respectively, a transverse frame is slidably connected to the side surface of the detection table, a turnover shaft is arranged at the end of the transverse frame away from the ground, a turnover plate is rotatably connected to the middle of the turnover shaft, a fixed clamping head is arranged in the middle of the turnover plate, and movable clamping heads matched with the fixed clamping head are arranged on both sides of the fixed clamping head. The present application realizes the automatic opening and clamping of the movable clamping heads when the turnover plate moves to the storage mechanism through the pure mechanical linkage of the turnover plate and the unfolding mechanism, the whole feeding, testing and discharging process does not need manual intervention, and the testing efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of thermal protector testing technology, specifically a thermal protector testing device. Background Technology

[0002] A thermal protector is a temperature-controlled safety device. Its core typically uses a bimetallic strip structure connected in series in the electrical circuit. When the equipment temperature rises to a set threshold, the bimetallic strip deforms due to the difference in thermal expansion coefficients, driving the contacts to transiently switch and cut off the circuit (the mainstream product is normally closed), thereby preventing downstream components from burning out due to overheating. When the temperature drops back to the reset value, the contacts can automatically or manually return to the conducting state, closing the circuit again.

[0003] Thermal protectors typically have two leads for series connection to the circuit under test. During factory testing, the thermal protector's temperature triggering characteristics are a mandatory core safety requirement and cannot be omitted. However, existing testing equipment cannot automatically identify and clamp these leads; operators must manually place each lead into the clamping unit to complete the electrical connection. This manual operation results in low efficiency throughout the loading process, making it difficult to keep pace with the high-volume, continuous production of an assembly line. Therefore, it is necessary to improve existing testing equipment to enhance its automation level and production efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a thermal protector testing device to solve the technical problem of low efficiency of manual feeding in the prior art.

[0005] A thermal protector testing device includes a testing platform and a protector under test. The protector under test has a protector body and a protector lead wire extending from the protector body. A heating chamber is provided in the middle of the testing platform, and water baths are provided on both sides of the heating chamber. The two water baths correspond to the upper and lower limits of the nominal operating temperature of the protector under test, respectively. A transverse frame is slidably connected to the side of the testing platform. A flipping shaft is provided at the end of the transverse frame away from the ground. A flipping plate is rotatably connected to the middle of the flipping shaft. A fixed clamping head is provided in the middle of the flipping plate. Movable clamping heads are provided on both sides of the fixed clamping head to cooperate with it. The movable clamping heads abut against the fixed clamping heads to clamp the protector lead wire. The device also includes an unfolding mechanism and a material storage mechanism.

[0006] An unfolding mechanism is located at both ends of the testing platform and is used to drive the movable clamping head to move away from the fixed clamping head.

[0007] The storage mechanism is located at the end of the test bench near the water bath that meets the lower limit of the nominal operating temperature. It is used to store the vertically stacked protector bodies, with the protector leads pointing towards the center of the test bench.

[0008] As a preferred embodiment of the present invention, a conductive block electrically connected to the fixed clamping head and the movable clamping head is provided on the side of the transverse frame near the ground. A conductive seat corresponding to the two water baths is provided at the bottom of the testing platform. When the flip plate moves to the center position of the water bath, the conductive seat is electrically connected to the conductive block. A reciprocating drive assembly for driving the transverse frame to move back and forth is also provided at the bottom of the testing platform. The reciprocating drive assembly is electrically connected to the conductive block. When the on / off state of the protector under test in the water bath does not match the nominal operating temperature corresponding to the water bath, the reciprocating drive assembly stops working.

[0009] As a preferred embodiment of the present invention, the reciprocating drive assembly includes traction brackets disposed at both ends of the testing platform, each traction bracket having a traction wheel rotatably connected to it, a traction belt being wound between two traction wheels, the middle part of the traction belt being fixedly connected to the transverse frame, and a traction motor for driving the traction wheel to rotate being disposed on one of the traction brackets.

[0010] As a preferred embodiment of the present invention, the unfolding mechanism includes a positioning plate disposed on the side of the flip plate, a fixing block disposed in the middle of the flip plate, a guide post disposed between each side of the fixing block and the two positioning plates, a clamping plate slidably connected to the guide post, the clamping plate being fixedly connected to the movable clamping head, a clamping spring sleeved on the outer side of the guide post, the clamping spring applying an elastic force toward the fixing block to the clamping plate, and a ball head disposed at the end of the clamping plate away from the movable clamping head.

[0011] As a preferred embodiment of the present invention, the unfolding mechanism further includes a first support disposed at the end of the testing platform away from the storage mechanism. The end of the first support is provided with an L-shaped top plate. The end of the L-shaped top plate away from the testing platform is provided with a material release triangular top block that cooperates with the ball head. When the flipping plate moves with the transverse frame to abut against the L-shaped top plate, the flipping plate rotates in the direction away from the testing platform. The material release triangular top block is inserted between the two ball heads, driving the two movable clamping heads to move in the direction away from the fixed clamping head. The protector under test is released from the flipping plate under the action of gravity.

[0012] As a preferred embodiment of the present invention, the unfolding mechanism further includes a second bracket disposed at one end of the testing platform near the storage mechanism. Two L-shaped guide plates are disposed opposite each other on the side of the second bracket away from the testing platform. A clamping triangular top block is disposed between the two L-shaped guide plates. When the flipping plate moves toward the second bracket with the transverse frame, the side of the L-shaped guide plate abuts against the side of the positioning plate. When the side of the L-shaped guide plate is fully in contact with the side of the positioning plate, the flipping plate is in a horizontal state. The clamping triangular top block is inserted between the two ball heads, and the two movable clamping heads move toward the direction away from the fixed clamping head. The protector lead of the protector to be tested in the storage mechanism enters between the movable clamping head and the fixed clamping head.

[0013] As a preferred embodiment of the present invention, the material storage mechanism includes an extension seat fixedly connected to the testing table, a material feeding plate is provided at the end of the extension seat, a material feeding frame is provided on the side of the material feeding plate, and the main body of the protector is horizontally stacked inside the material feeding frame.

[0014] As a preferred embodiment of the present invention, the side of the feeding plate is provided with a limiting component to restrict the movement of the bottommost protector under test in the feeding frame toward the testing table. The side of the feeding frame is provided with a limiting frame, which is used to separate the protector leads of two adjacent protectors under test located at the bottom of the feeding frame.

[0015] As a preferred embodiment of the present invention, the limiting component includes a fixed plate fixedly connected to the feeding plate, a top rod slidably connected to the middle of the fixed plate, a limiting block provided at the end of the top rod, and a limiting spring provided between the limiting block and the fixed plate. In the free state, the limiting block is held at a position higher than the bottom surface of the bottom protector body of the feeding frame under the action of the limiting spring, so as to prevent the protector body from moving out towards the detection table.

[0016] By adopting the above technical solution, the present invention has the following beneficial effects:

[0017] 1. Through the left and right movement of the flip plate and the coordination of the unfolding mechanism, when the flip plate moves to the left end of the detection table and docks with the storage mechanism, the movable clamping head and the fixed clamping head can open and close adaptively, automatically completing the clamping operation of the protector lead wire. The entire feeding process relies entirely on mechanical transmission to achieve automatic positioning and clamping, without manual intervention, which significantly improves detection efficiency.

[0018] 2. Through the cooperation of the feeding frame and the limiting components and the limiting frame in the material storage mechanism, the batch stacking and orderly discharge of the protectors under test are realized. The operator only needs to replenish the material in stages to maintain the continuous operation of the equipment for a long time, which greatly reduces the frequency of manual operation and labor intensity.

[0019] 3. By linking the material release triangular top block and the clamping triangular top block in the unfolding mechanism with the purely mechanical wedge block of the ball head, the automatic opening of the feeding end clamping port and the automatic opening of the material release end clamping port can be realized simultaneously under the same moving power drive of the transverse frame. There is no need to configure an independent drive element and control circuit for the opening and closing of the clamping head. The structure is simple and compact, with low manufacturing cost and high reliability.

[0020] 4. By flipping the plate upwards during the feeding process, the protector lead wire, which naturally droops and bends under gravity, can be lifted and guided into the clamping mouth, improving the lead wire alignment accuracy and further reducing the risk of feeding jamming. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a thermal protector testing device.

[0023] Figure 2 This is a front view of a thermal protector testing device.

[0024] Figure 3 This is a schematic diagram of the structure at the bottom of the test bench in a thermal protector testing device.

[0025] Figure 4 This is a schematic diagram of the structure of a flip plate in a thermal protector testing device.

[0026] Figure 5 This is a schematic diagram of the unfolding mechanism on the right side of a thermal protector testing device.

[0027] Figure 6 This is a schematic diagram of the structure of a material removal triangular apex block and a ball head in a thermal protector testing device.

[0028] Figure 7 for Figure 6 The front view.

[0029] Figure 8 This is a schematic diagram of the material storage mechanism in a thermal protector testing device.

[0030] Figure 9 for Figure 8 A magnified view of part A in the diagram.

[0031] Figure 10This is a schematic diagram of the unfolding mechanism on the left side of a thermal protector testing device.

[0032] Figure 11 This is a schematic diagram of the structure of a thermal protector testing device that holds a triangular apex block in conjunction with a ball head.

[0033] Figure 12 for Figure 11 Top view.

[0034] In the diagram: 1. Testing platform; 2. Heating chamber; 3. Water bath; 4. Horizontal movement frame; 5. Tilting shaft; 6. Unfolding mechanism; 7. Material storage mechanism; 8. Conductive block; 9. Conductive base; 10. Traction belt; 11. Traction bracket; 12. Traction wheel; 13. Traction motor; 14. Reciprocating drive assembly; 15. Tilting plate; 16. Protector body; 17. Fixed clamping head; 18. Movable clamping head; 19. Fixing block; 20. Guide column; 21. 21. Clamping plate; 22. Clamping spring; 23. Ball head; 24. Positioning plate; 25. First bracket; 26. L-shaped top plate; 27. Unloading triangular top block; 28. Second bracket; 29. ​​L-shaped guide plate; 30. Clamping triangular top block; 31. Extending seat; 32. Discharge plate; 33. Discharge frame; 34. Limiting frame; 35. Fixing plate; 36. Top rod; 37. Limiting spring; 38. Limiting block; 39. Limiting assembly; 40. Protector lead wire. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In one embodiment, see Figure 1 and Figure 2 A thermal protector testing device is disclosed. The device's supporting base is a testing platform 1, which adopts an aluminum profile or sheet metal welded frame structure. A linear guide rail is installed on the top surface along the length direction to provide sliding guidance for the transverse frame 4. A heating chamber 2 is fixedly installed in the middle of the testing platform 1. The heating chamber 2 has a built-in electric heating tube and a PID temperature control module to provide a constant temperature heat source and temperature compensation for the water baths 3 on both sides. Independent water baths 3 are set on the left and right sides of the heating chamber 2, respectively. The water bath 3 on the left side corresponds to the lower limit of the nominal operating temperature of the protector under test, and the water bath 3 on the right side corresponds to the upper limit of the nominal operating temperature.

[0037] Two water baths 3 are filled with liquid media. Deionized water is used in the range of room temperature to 95℃, and dimethyl silicone oil is used in the high temperature range above 100℃. The temperature is kept constant by the zoned temperature control system of the heating box 2, and the temperature fluctuation is controlled within ±0.2℃. The temperature uniformity of the working area in the tank is ≤±0.5℃ to meet the accuracy requirements of the thermal protector sorting at the factory.

[0038] The transverse frame 4 is slidably mounted on the guide rail of the testing table 1 via a slider, and can move back and forth along the length of the testing table 1. A rotating shaft 5 with a front-to-back orientation is fixedly mounted on the upper end of the transverse frame 4. The rotating plate 15 is rotatably connected to the rotating shaft 5 via a wear-resistant bushing, and can swing freely around the rotating shaft 5. A clamping assembly is installed on the side of the rotating plate 15 facing the water bath 3, used to clamp the two protector leads 40 of the protector under test. When the rotating plate 15 swings downwards to a vertical position, the clamped protector body 16 hangs down into the water bath 3 below, completely immersed in the constant temperature medium, ensuring uniform heating and minimal temperature measurement lag.

[0039] In one instance of this embodiment, please refer to Figure 1 and Figure 4 A fixing block 19 is fixed to the middle of the flip plate 15 near the flip shaft 5. A fixing clamping head 17 is fixedly installed at one end of the fixing block 19 near the center of the flip plate 15. A movable clamping head 18 is provided on each of the front and rear sides of the fixing clamping head 17. The two movable clamping heads 18 correspond to and cooperate with the front and rear clamping surfaces of the fixing clamping head 17 to form two sets of independent clamping ports, which clamp the two protector leads 40 of the protector under test. The clamping surfaces of the fixing clamping head 17 and the movable clamping head 18 are made of brass with excellent conductivity and the surface is treated with anti-slip knurling to ensure reliable electrical contact and prevent the leads from slipping.

[0040] Positioning plates 24 are provided on the front and rear sides of the flip plate 15. A guide post 20 is fixedly connected to each of the front and rear sides of the fixing block 19 and the positioning plate 24. The guide post 20 is parallel to the axis of the flip shaft 5. A clamping plate 21 is slidably sleeved on each guide post 20. The movable clamping head 18 is fixedly installed on the end of the corresponding clamping plate 21 by screws. A clamping spring 22 is sleeved on the outside of the guide post 20. One end of the clamping spring 22 abuts against the inner side of the positioning plate 24, and the other end abuts against the outer end face of the clamping plate 21, always applying an elastic pushing force toward the fixing block 19 to the clamping plate 21. In the free state, the clamping spring 22 pushes the clamping plate 21 to drive the movable clamping head 18 to fit tightly against the fixed clamping head 17, maintaining a stable clamping force to ensure stable lead contact resistance and accurate detection data.

[0041] A spherical ball head 23 is fixedly installed on the outer end of the clamping plate 21 (the end away from the fixed clamping head 17). The ball head 23 protrudes from the end face of the flipping plate 15, with the spherical surface facing outward. The ball head 23 is used to cooperate with the triangular top blocks at both ends, converting the horizontal thrust of the top blocks into the outward sliding displacement of the clamping plate 21, thereby realizing the automatic opening of the clamping opening. The spherical structure can reduce the friction of the mating, making the opening and closing action smoother and reducing wear.

[0042] In one instance of this embodiment, please refer to Figure 1 and Figure 3 A reciprocating drive assembly 14 is installed at the bottom of the testing platform 1 to drive the transverse frame 4 to reciprocate along the guide rail. The reciprocating drive assembly 14 includes two traction brackets 11 fixed at the left and right ends of the bottom of the testing platform 1, respectively. Each traction bracket 11 has a traction wheel 12 rotatably mounted on it via bearings. A synchronous traction belt 10 is tensioned and wound between the two traction wheels 12. The upper surface of the traction belt 10 is fixedly connected to the bottom of the transverse frame 4 via a pressure block connector. A traction motor 13 is fixedly mounted on one end of the traction bracket 11. The output shaft of the traction motor 13 is connected to the corresponding traction wheel 12 via a coupling. The traction motor 13 is a reversible geared stepper motor. It drives the traction belt 10 through the traction wheel 12, thereby driving the transverse frame 4 to perform reciprocating linear motion on the testing platform 1. The movement position and speed can be precisely controlled.

[0043] A conductive block 8 is fixedly installed at the bottom of the transverse frame 4. The conductive block 8 adopts an elastic pin structure and is electrically connected to the fixed clamping head 17 and the movable clamping head 18 through shielded wires, leading out the circuit of the clamped protector lead 40. At the bottom of the test table 1, directly below the two water baths 3, a conductive seat 9 is fixedly installed in each position. The conductive seat 9 is connected to an external continuity detection circuit, which is supplied with a DC detection current of no more than 0.1A, which meets the small current requirements for pure temperature characteristic testing in the national standard, and avoids the protector's own heating affecting the temperature detection results.

[0044] When the transverse frame 4 moves the tilting plate 15 to directly above the water bath 3, the protector body 16 is immersed in the water bath medium to reach thermal equilibrium. At the same time, the conductive block 8 makes reliable contact with the corresponding conductive seat 9, and the protector under test is connected to the detection circuit. The system can then determine the on / off state of the contacts in real time. If the on / off state does not match the judgment rule corresponding to the water bath 3 (e.g., the lower limit slot should be on but is off, or the upper limit slot should be off but is on), the detection circuit immediately sends a stop signal to the traction motor 13, the reciprocating drive assembly 14 stops working, the equipment maintains its current position and triggers an audible and visual alarm, prompting the operator to remove defective products, effectively preventing defective products from flowing into the next process.

[0045] In one instance of this embodiment, please refer to Figures 5-12The unfolding mechanism 6 is divided into two parts: the unloading end unfolding mechanism 6 and the loading end unfolding mechanism 6, which are respectively set at the left and right ends of the inspection table 1. Utilizing the moving power of the transverse frame 4, the clamping head is automatically opened through pure mechanical linkage without the need for additional drive components and control circuits. The structure is simple and highly reliable.

[0046] The unfolding mechanism 6 of the unloading end is located at the right end of the testing table 1, including a first bracket 25 vertically fixed to the right end of the testing table 1. The first bracket 25 adopts a profile welded structure, with its bottom end firmly connected to the testing table 1 and an L-shaped top plate 26 fixed at its top. The horizontal section of the L-shaped top plate 26 extends horizontally toward the center of the testing table 1. A unloading triangular top block 27 is fixedly installed at the end of the vertical section of the L-shaped top plate 26. The unloading triangular top block 27 is a wedge structure, with a smooth guiding slope on the side facing the center of the testing table 1. Two ball heads 23 can slide in along the slope and be simultaneously opened to both sides.

[0047] When the transverse frame 4 moves the tilting plate 15 to the right to the unloading station, the right side of the tilting plate 15 first abuts against the left end of the L-shaped top plate 26. As the transverse frame 4 continues to move to the right, the tilting plate 15, under the limiting action of the L-shaped top plate 26, tilts upward around the tilting axis 5. At the same time, the unloading triangular top block 27 is inserted between the two ball heads 23, and the inclined plane pushes the two ball heads 23 to both sides, causing the clamping plate 21 to compress the clamping spring 22 and slide outward. The movable clamping head 18 separates from the fixed clamping head 17, and the clamping opening is fully opened. The clamped protector lead 40 loses its clamping force, and the protector under test falls off the tilting plate 15 under its own gravity and falls into the qualified product receiving box below, completing the automatic unloading.

[0048] The unfolding mechanism 6 at the feeding end is located at the left end of the inspection table 1. It includes a second bracket 28 vertically fixed to the left end of the inspection table 1. Two L-shaped guide plates 29 are fixedly installed on the front and rear sides of the top of the second bracket 28. The lower surfaces of the two L-shaped guide plates 29 are flat, and an opening for the ball head 23 to move is provided in the middle. They can cooperate with the positioning plates 24 on both sides of the flip plate 15 to guide and correct the swing angle of the flip plate 15. A clamping triangular top block 30 is fixedly installed in the middle position between the two L-shaped guide plates 29. The clamping triangular top block 30 is also a wedge structure. The side facing the center of the inspection table 1 is a guiding slope, and the slope angle is the same as that of the unloading triangular top block 27.

[0049] When the transverse frame 4 moves the tilting plate 15 to the left to the loading station, the left side of the positioning plates 24 on both sides of the tilting plate 15 first abuts against the right end of the L-shaped guide plate 29. At this time, the positioning plates 24 drive the tilting plate 15 to rotate clockwise, and the tilting plate 15 gradually rotates upward from the drooping state to correct the angle. When the positioning plates 24 are completely against the lower surface of the L-shaped guide plate 29, the tilting plate 15 is limited to a precise horizontal state. Then the transverse frame 4 continues to move, and the clamping triangular top block 30 is inserted between the two ball heads 23. The two ball heads 23 are opened by the inclined plane, which drives the movable clamping head 18 to move outward. The clamping mouth is fully opened, and the position of the clamping mouth is exactly aligned with the lead wire position of the bottom test protector in the storage mechanism 7. The protector lead wire 40 naturally enters the clamping mouth, preparing for clamping and loading. During this process, when the flip plate 15 flips upward, it can also lift the protector lead 40, which is bent downward by gravity, so that the protector lead 40 can enter more accurately between the fixed clamping head 17 and the movable clamping head 18.

[0050] In one instance of this embodiment, please refer to Figure 8 and Figure 9 The storage mechanism 7 is located at the left end (feeding end) of the testing table 1, corresponding to the left side of the water bath 3. It is used to store the protectors to be tested in batches, enabling continuous feeding and reducing the frequency of manual replenishment. The storage mechanism 7 includes an extension seat 31 fixedly connected to the left side of the testing table 1. The extension seat 31 extends horizontally outward, and a horizontal feeding plate 32 is fixedly installed at its outer end. A feeding frame 33 is fixedly installed on the side of the upper surface of the feeding plate 32. The feeding frame 33 is a vertical rectangular frame structure, forming a stacking compartment inside. Dozens of protector bodies 16 of the protectors to be tested are horizontally stacked in the stacking compartment, and the protector leads 40 of all the protectors to be tested extend horizontally towards the center of the testing table 1.

[0051] The feeding frame 33 has a discharge opening on the side facing the testing table 1. The height of the opening only allows the bottommost protector body 16 to move horizontally out. A limit component 39 is provided below the opening to prevent the protector under test from slipping off when it is not removed. A limit frame 34 is also fixedly installed on the protruding side of the protector lead 40 of the feeding frame 33. The limit frame 34 is used to separate the protector lead 40 of two adjacent protectors under test at the bottom of the feeding frame 33, so that when the fixed clamping head 17 and the movable clamping head 18 clamp the protector lead 40 of the bottom protector under test, the protector lead 40 of the adjacent protector under test above will not be pulled out. This ensures that only the bottom set of leads is aligned with the clamping opening each time, greatly reducing the failure of material jamming.

[0052] The limiting assembly 39 includes a fixing plate 35 fixed to the right end of the feeding plate 32. A top rod 36 is vertically slidably mounted on the fixing plate 35. A limiting block 38 is fixedly connected to the top of the top rod 36. The top surface of the limiting block 38 is an arc surface. A limiting spring 37 is sleeved on the outside of the top rod 36. The limiting spring 37 abuts between the fixing plate 35 and the limiting block 38. In the free state, the limiting spring 37 pushes the limiting block 38 upward, so that the top surface of the limiting block 38 is higher than the bottom surface of the bottom protector body 16 in the feeding frame 33, forming a block to prevent the protector under test from sliding out on its own.

[0053] When the fixed clamping head 17 and the movable clamping head 18 clamp the protector lead 40 of the bottom protector under test and pull it to the right, the edge of the protector body 16 presses against the arc surface of the limiting block 38, causing the limiting block 38 to compress the limiting spring 37 downwards. The bottom protector under test can then be pulled horizontally out of the discharge frame 33. After the protector under test is completely removed, the limiting block 38 springs back to its original position under the action of the limiting spring 37, blocking the next protector under test above, thus achieving piece-by-piece discharge and preventing multiple pieces from falling simultaneously.

[0054] The complete working cycle of this equipment is as follows, taking a normally closed thermal protector with the left slot as the lower limit of the operating temperature and the right slot as the upper limit of the operating temperature as an example:

[0055] Step 1, Initial Material Replenishment: With the equipment stopped, the operator stacks a batch of protectors to be tested into the feeding frame 33, with the protector leads 40 facing to the right, and inserts them into the limiting frames 34 respectively. After confirming that the leads are not tangled, the material replenishment is completed. A single material replenishment can support the continuous testing of dozens of pieces, and material replenishment can continue during the testing process.

[0056] Step 2, Loading and Clamping: The traction motor 13 starts, driving the transverse frame 4 to move to the left via the traction belt 10. The flipping plate 15 moves to the left with the transverse frame 4 and enters the unfolding mechanism 6 at the loading end. The positioning plate 24 slides along the lower surface of the L-shaped guide plate 29. The flipping plate 15 rotates clockwise to a horizontal state, and during the rotation, the flipping plate 15 lifts up the bottom protector lead wire 40. Then, the clamping triangular top block 30 is inserted between the two ball heads 23, opening the movable clamping head 18. The clamping opening is fully opened, and the two protector leads 40 of the bottom protector to be tested naturally enter the clamping opening.

[0057] Subsequently, the traction motor 13 reverses, and the transverse frame 4 drives the flipping plate 15 to move slightly to the right. The ball head 23 disengages from the clamping triangular top block 30, and the clamping spring 22 rebounds, pushing the movable clamping head 18 to clamp the protector lead wire 40 with the set clamping force. As the transverse frame 4 continues to move to the right, the flipping plate 15 loses the support of the L-shaped guide plate 29 and flips downward around the flipping axis 5 to a near-vertical state under the action of gravity. The protector body 16 is in a drooping state, ready to enter the water bath 3.

[0058] Step 3, Lower Limit Slot Detection: The transverse frame 4 continues to move to the right at a constant speed, bringing the protector under test directly above the left water bath 3 (when it encounters the side wall of the heating box 2, the flip plate 15 adaptively deflects), and the protector body 16 is completely immersed in the water bath medium at the lower limit temperature. The conductive block 8 makes stable contact with the left conductive base 9, the detection circuit is connected, and the system determines the on / off state of the protector contacts:

[0059] If the contacts are in the conducting state (which meets the normal state of a normally closed protector at low temperatures), the lower limit is deemed qualified, and the equipment continues to operate.

[0060] If the contact is in the open state, it is determined that the operating temperature is too low and the product is unqualified. The system will immediately control the traction motor 13 to stop and trigger an audible and visual alarm. After the unqualified product is manually removed, the system will restart by pressing the reset button.

[0061] Step 4, Upper Limit Slot Detection: After the lower limit slot detection is passed, the transverse frame 4 continues to move to the right, causing the protector under test to leave the left slot and enter directly above the right water bath 3. The protector body 16 is completely immersed in the water bath medium at the upper limit temperature. After thermal equilibrium is reached, the conductive block 8 contacts the right conductive seat 9, and the detection circuit determines the on / off state again.

[0062] If the contacts are in the open state (which is in line with the normal state of operation under high temperature), the overall operating temperature is considered to be qualified, and the equipment continues to operate;

[0063] If the contact is still in the conducting state, it is determined that the operating temperature is too high and unqualified. The system will immediately control the traction motor 13 to stop and alarm.

[0064] Step 5, Automatic Unloading: After the upper limit groove passes the inspection, the transverse frame 4 continues to move to the right to the unloading station. The right side of the flip plate 15 abuts against the L-shaped top plate 26, and gradually flips upward as the transverse frame 4 moves to the right. Then, the unloading triangular top block 27 is inserted between the two ball heads 23, opening the movable clamping head 18. The clamping opening opens, the test protector loses its clamping force, and falls downward under the action of gravity into the qualified product receiving box.

[0065] Step 6, Return Reset: After unloading is completed, the traction motor 13 reverses, the transverse frame 4 moves to the left and returns to the loading station, and at the same time, the next protector to be tested in the unloading frame 33 falls to the discharge position under gravity, and the equipment enters the next testing cycle. The equipment repeats this process continuously and automatically to complete the sorting and testing of batch protectors.

[0066] This invention provides a thermal protector testing device. Through the purely mechanical linkage between the flip plate 15 and the unfolding mechanism 6, the movable clamping head 18 automatically opens and clamps the protector lead wire 40 when the flip plate 15 moves to the storage mechanism 7, and automatically opens to unload the material when it moves to the unloading end. The entire feeding, testing, and unloading process requires no manual intervention, greatly improving testing efficiency. Through the cooperation of the feeding frame 33, the limiting component 39, and the limiting frame 34 in the storage mechanism 7, batch stacking and orderly unloading of individual items are achieved. Operators only need to replenish materials in stages, significantly reducing labor intensity. At the same time, the opening and closing actions of the clamping heads for feeding and unloading are driven by the same moving power of the transverse frame 4, eliminating the need for additional pneumatic or electric drive components. The structure is simple, the manufacturing cost is low, and the reliability is high.

[0067] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

Claims

1. A thermal protector testing device, comprising a testing platform and a protector under test, the protector under test having a protector body and protector leads extending from the protector body, a heating chamber disposed in the middle of the testing platform, and water baths disposed on both sides of the heating chamber, the two water baths corresponding to the upper and lower limits of the nominal operating temperature of the protector under test, respectively, characterized in that, The testing platform is slidably connected to a transverse frame on its side. A flipping shaft is provided at the end of the transverse frame away from the ground. A flipping plate is rotatably connected to the middle of the flipping shaft. A fixed clamping head is provided in the middle of the flipping plate. Movable clamping heads are provided on both sides of the fixed clamping head to cooperate with it. The movable clamping heads and the fixed clamping heads abut against each other to clamp the protector lead wire. The platform also includes an unfolding mechanism and a material storage mechanism. An unfolding mechanism is located at both ends of the testing platform and is used to drive the movable clamping head to move away from the fixed clamping head. The storage mechanism is located at the end of the test bench near the water bath that meets the lower limit of the nominal operating temperature. It is used to store the vertically stacked protector bodies, with the protector leads pointing towards the center of the test bench.

2. The thermal protector testing device according to claim 1, characterized in that, A conductive block electrically connected to the fixed clamping head and the movable clamping head is provided on the side of the transverse frame near the ground. A conductive seat corresponding to the two water baths is provided at the bottom of the testing platform. When the flip plate moves to the center position of the water bath, the conductive seat is electrically connected to the conductive block. A reciprocating drive assembly for driving the transverse frame to move back and forth is also provided at the bottom of the testing platform. The reciprocating drive assembly is electrically connected to the conductive block. When the on / off state of the protector under test in the water bath does not match the nominal operating temperature corresponding to the water bath, the reciprocating drive assembly stops working.

3. The thermal protector testing device according to claim 2, characterized in that, The reciprocating drive assembly includes traction brackets at both ends of the testing platform, each traction bracket is rotatably connected to a traction wheel, a traction belt is wound between two traction wheels, the middle part of the traction belt is fixedly connected to the transverse frame, and a traction motor for driving the traction wheel to rotate is provided on one of the traction brackets.

4. The thermal protector testing device according to claim 1, characterized in that, The unfolding mechanism includes a positioning plate disposed on the side of the flip plate, a fixing block disposed in the middle of the flip plate, a guide post disposed between each side of the fixing block and the two positioning plates, a clamping plate slidably connected to the guide post, the clamping plate being fixedly connected to the movable clamping head, a clamping spring being sleeved on the outer side of the guide post, the clamping spring applying an elastic force toward the fixing block to the clamping plate, and a ball head disposed at the end of the clamping plate away from the movable clamping head.

5. The thermal protector testing device according to claim 4, characterized in that, The unfolding mechanism also includes a first support set at the end of the testing platform away from the storage mechanism. The end of the first support is provided with an L-shaped top plate. The end of the L-shaped top plate away from the testing platform is provided with a material release triangular top block that cooperates with the ball head. When the flip plate moves with the transverse frame to abut against the L-shaped top plate, the flip plate rotates in the direction away from the testing platform. The material release triangular top block is inserted between the two ball heads, driving the two movable clamping heads to move in the direction away from the fixed clamping head. The protector under test is released from the flip plate under the action of gravity.

6. The thermal protector testing device according to claim 4, characterized in that, The unfolding mechanism also includes a second bracket disposed at one end of the testing platform near the storage mechanism. Two L-shaped guide plates are disposed opposite each other on the side of the second bracket away from the testing platform. A clamping triangular top block is disposed between the two L-shaped guide plates. When the flipping plate moves toward the second bracket with the transverse frame, the side of the L-shaped guide plate abuts against the side of the positioning plate. When the side of the L-shaped guide plate is fully in contact with the side of the positioning plate, the flipping plate is in a horizontal state. The clamping triangular top block is inserted between the two ball heads. The two movable clamping heads move toward the direction away from the fixed clamping head. The protector lead of the protector to be tested in the storage mechanism enters between the movable clamping head and the fixed clamping head.

7. The thermal protector testing device according to claim 1, characterized in that, The material storage mechanism includes an extension seat fixedly connected to the testing table, a material feeding plate at the end of the extension seat, a material feeding frame on the side of the material feeding plate, and the main body of the protector being horizontally stacked inside the material feeding frame.

8. The thermal protector testing device according to claim 7, characterized in that, The side of the feeding plate is provided with a limiting component to restrict the movement of the bottommost protector under test in the feeding frame toward the testing table. The side of the feeding frame is provided with a limiting frame, which is used to separate the protector leads of two adjacent protectors under test located at the bottom of the feeding frame.

9. A thermal protector testing device according to claim 8, characterized in that, The limiting component includes a fixed plate fixedly connected to the feeding plate, a top rod slidably connected to the middle of the fixed plate, a limiting block provided at the end of the top rod, and a limiting spring provided between the limiting block and the fixed plate. In the free state, the limiting block is held at a position higher than the bottom surface of the bottom protector body of the feeding frame under the action of the limiting spring, which is used to prevent the protector body from moving out towards the detection table.

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