A PTC thermistor testing device applied to thermistor testing

Abstract

This invention provides a PTC thermistor testing device for thermistor testing, belonging to the field of PTC thermistor testing technology. It includes a test base, a running structure, a testing structure, and a control module. The running structure uses a chain conveyor belt to drive multiple sets of feeding plates and test seats to rotate intermittently. The feeding plates can automatically open and close by gravity according to the workstation position, sequentially completing the feeding at the receiving position, clamping of the workpiece at the clamping position, and then transferring it to the testing position. The testing structure includes liftable conductive columns and testing fixtures. A sliding block switches the connection object of the test seat. After receiving the test seat, it descends and is immersed in a constant-temperature silicone oil bath to conduct the test circuit. This achieves mechanical connection before electrical connection and electrical disconnection before mechanical separation, avoiding live plugging and unplugging at the contact ends, reducing electrolytic wear, and enabling fully automated operation, improving testing stability and batch testing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of PTC thermistor testing technology, and more specifically, relates to a PTC thermistor testing device for thermistor testing. Background Technology

[0002] With the development of the electronic component manufacturing industry, PTC thermistors, as sensitive elements with positive temperature coefficient characteristics, have seen their application scope expand in the fields of home appliance temperature control, new energy vehicles, and industrial overcurrent protection, and their market output has increased year by year. In the production process of PTC thermistors, it is necessary to test the resistance temperature characteristics.

[0003] Currently, the industry mostly uses a silicone oil constant temperature oil bath method to complete parameter calibration at multiple temperature points. The resistance value changes with temperature through external testing instruments to determine whether the component meets the usage requirements. However, existing PTC thermistor testing equipment mostly adopts a fixed station single batch testing mode. The workpiece loading and unloading and oil bath testing are in separate stations, requiring an additional transfer mechanism to complete the tooling transfer. The workpiece clamping and test connector insertion operations are completed sequentially. The timing of the actions and the clamping action of the fixture are easily out of sync, resulting in live plugging and unplugging between the contact end and the lead wire, which aggravates the electrolytic erosion and wear of the contact surface. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a PTC thermistor testing device for thermistor testing. This addresses the issue in existing PTC thermistor testing equipment where the timing of actions during tooling transfer is often out of sync with the clamping action of the fixture, leading to live insertion and removal between the contact end and the lead wire, thus exacerbating electrolytic erosion and wear on the contact surface.

[0005] The purpose and effectiveness of the PTC thermistor testing device of the present invention for thermistor testing are achieved by the following specific technical means: A PTC thermistor testing device for thermistor testing, comprising: The test base has a test structure and an operating structure on its top. The operating structure includes multiple sets of feeding plates and test seats located at receiving positions, fastening positions, or testing positions. A conveyor belt is installed above the test base to drive the feeding plates and test seats to rotate intermittently between the receiving, fastening, and testing positions. Multiple test seats are arranged around the conveyor belt. The feeding plates and test seats are rotatably connected. Test slots for supporting PTC thermistors are correspondingly opened on adjacent sides of the feeding plates and test seats. When the feeding plates and test seats are in the receiving position, both are located at one end of the conveyor belt, perpendicular to each other, opening the test slots to receive the PTC thermistors. When the feeding plates and test seats are in the fastening position, they are parallel, closing the test slots to clamp and fix the PTC thermistors. When the feeding plates and test seats are in the testing position, both are located in an oil tank at the top of the test base, allowing the PTC thermistors to be immersed in constant-temperature silicone oil for heating. The test structure includes multiple sets of test connection terminals and conduction connection terminals located at connection positions or test positions. When the test connection terminal and conduction connection terminal are in the connection position, the test connection terminal is connected to the test base, the feeding plate is clamped between the test connection terminal and the test base, and the test connection terminal is in contact with the lead wire of one end of the PTC thermistor. When the test connection terminal and conduction connection terminal are in the test position, the conduction connection terminal is connected to the test connection terminal, and the conduction connection terminal is connected to the tester in the test base for detecting the resistance value of the PTC thermistor. The control module is electrically connected to the operating structure and the test structure.

[0006] In a preferred embodiment, the test structure further includes multiple sets of conductive posts located at connection positions or test positions. The tops of the multiple sets of conductive posts are connected to the test fixture. The top of the test base is provided with an oil tank for holding silicone oil. Multiple sets of sliding holes are opened at the bottom of the oil tank. Sealing sliding sleeves are installed in the multiple sets of sliding holes. The multiple sets of conductive posts are slidably inserted into the multiple sets of sealing sliding sleeves. The bottom of the oil tank is provided with a lifting electric cylinder for driving the conductive posts to move up and down between the connection position and the test position. The lifting electric cylinder is connected to one of the sets of conductive posts. The top of the test fixture is provided with multiple sets of receiving seats. Multiple sets of test connection ends are respectively installed on the multiple sets of receiving seats. The lifting electric cylinder is electrically connected to the control module.

[0007] In a preferred embodiment, the conveyor belt is a chain conveyor belt, and multiple sets of feeding brackets are arranged on the periphery of both sides of the chain conveyor belt. Multiple sets of mounting plates are respectively arranged between the multiple sets of feeding brackets on both sides. Two sets of first connecting blocks are arranged on one side of the mounting plate. A first connecting groove is opened on the side of the two sets of first connecting blocks near the test seat. A sliding block is slidably arranged in the test seat corresponding to the first connecting groove. A second connecting groove is opened on the inner wall of both sides of the receiving seat corresponding to the two sets of sliding blocks. One end of the sliding block passes through the first connecting groove or the second connecting groove, which is used to realize the selective connection and fixation between the test seat and the mounting plate or the receiving seat.

[0008] In a preferred embodiment, when the conductive post is in the connection position, the receiving seat is in contact with the test seat, the first connecting groove and the second connecting groove are on the same axis, and one end of the sliding block passes through the first connecting groove or the second connecting groove. When the conductive post is in the test position, the receiving seat and the test seat are located in the oil tank. One end of the sliding block is inserted into the second connecting groove to fix the test seat on the receiving seat and move up and down synchronously with the conductive post, detaching from the conveyor belt to complete the immersion test.

[0009] In a preferred embodiment, one side of the test base is connected to the mounting plate via two sets of second connecting blocks. A sliding groove is provided on the side of the test base adjacent to the two sets of second connecting blocks. The two sets of sliding blocks slide through the two sets of sliding grooves respectively. The second connecting blocks and the top of the mounting plate are respectively provided with mounting grooves. A switching motor for driving one end of the sliding block to pass through the first or second connecting groove is provided in the mounting groove. The main shaft of the switching motor is provided with a moving wheel. A friction sleeve is provided on the outside of the moving wheel. A moving block is provided on the sliding block. The friction sleeve contacts the moving block.

[0010] In a preferred embodiment, the top of the mounting plate has two sets of mounting holes, each set of mounting holes is provided with a first connection end, and the two sets of first connection ends are electrically connected to two sets of switching motors respectively. Two sets of second connection ends are provided on both sides of the receiving seat. The conductive post has a hollow structure, and a power supply path and a test path are arranged inside it for transmitting drive power and test signals respectively. A connection terminal is provided at the bottom of the conductive post, and the two sets of second connection ends are electrically connected to the power supply path of the conductive post.

[0011] In a preferred embodiment, when the conductive post is in the connection position, the connection terminal is connected to the power supply terminal of the control module, the first connection terminal and the second connection terminal are connected and conductive, the control module controls the switching motor to rotate the moving wheel, driving the sliding block to move along the sliding groove between the first connection groove and the second connection groove, and the test connection terminal is connected to the conductive connection terminal; When the conductive post is in the test position, the connection terminal is connected to the tester, enabling the tester to form a test circuit with the PTC thermistor through the test path, the conductive connection terminal, and the test connection terminal, which is used to detect the resistance data of the PTC thermistor as the temperature changes.

[0012] In a preferred embodiment, the operating structure further includes a stepper motor for driving the conveyor belt, a mounting bracket is provided on the top of the test base, the conveyor belt is mounted on the mounting bracket, the stepper motor is mounted on one side of the mounting bracket, the shaft end of the stepper motor is connected to the drive shaft of the conveyor belt, the indexing rotation of the stepper motor spindle is used to drive multiple sets of test bases on the conveyor belt to pass through the receiving position in sequence, and an infrared sensor is provided on one side of the mounting bracket for detecting the test bases passing through the receiving position.

[0013] In a preferred embodiment, a fixed bracket is provided on the top of the mounting bracket, and a linear module is vertically arranged inside the fixed bracket. A T-shaped moving plate is provided on the slider of the linear module, and two sets of clamping cylinders are provided at the bottom of the T-shaped moving plate. Two sets of pneumatic clamping blocks at the bottom of the two sets of clamping cylinders are respectively connected to the two sets of clamping plates. Multiple sets of fixed frames are provided between the two sets of clamping plates. The clamping cylinders are used to drive the two sets of clamping plates to open and close to clamp or release the fixed frames. Test connection ends are provided at both ends of the multiple sets of fixed frames. A fixed post is provided on one side of the test connection end. Fixed holes are opened on the top of the feeding plate and the test seat corresponding to the fixed post. The stepper motor, infrared sensor, linear module and clamping cylinder are all electrically connected to the control module. When the T-shaped moving plate is at the upper stop of the linear module, the clamping plate and the fixed frame are lifted and disengaged from the feeding plate and the test seat to avoid the workpiece flow of the conveyor belt. When the T-shaped moving plate is at the lower stop point of the linear module, the fixing post is inserted into the corresponding fixing hole to complete the positioning, and the test connection end is attached to the lead wire of the PTC thermistor.

[0014] In a preferred embodiment, a feeding arm is provided on one side of the operating structure. The feeding arm is used to transport the PTC thermistor to be tested at the feeding end to the receiving position of the operating structure. A discharging arm is provided on the other side of the operating structure. The discharging arm is used to transport the PTC thermistor that has been tested on the operating structure to the discharging end. The oil tank is equipped with a heater and a temperature sensor. The heater is used to heat the silicone oil in the oil tank, and the temperature sensor is used to detect the temperature data of the silicone oil in the oil tank.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. By coordinating the lifting of the conductive column with the translation of the sliding block, a fixed action sequence is established: mechanical connection first, electrical connection second, electrical disconnection first, and mechanical separation last. During station transition, the receiving seat first completes mechanical alignment with the test seat. After they are aligned, the sliding block translates to switch the connection state, gradually completing the electrical connection between the test connection end and the conductive connection end. When the station is turned out, the sliding block first translates to disconnect the electrical path, and then releases the mechanical fixation to complete the tooling separation. The entire action sequence is directly constrained by the structural stroke, eliminating the need for complex timing coordination of multiple drive mechanisms. This fundamentally avoids the contact end from completing the insertion and removal action under load, reducing electrolytic wear on the contact end surface caused by energization and disconnection, extending the service life of the contact components, and maintaining stable contact resistance to ensure the consistency and stability of resistance test data.

[0016] 2. Utilizing the gravity of the unloading plate in conjunction with the intermittent rotation of the conveyor belt, the workpiece-bearing fixture automatically opens and closes. When the unloading plate and the test seat move to the receiving position with the conveyor belt, the unloading plate naturally rotates under gravity to a position perpendicular to the test seat, opening the test slot to receive the workpiece. When they move to the locking position at the top of the conveyor belt, the unloading plate naturally closes onto the test seat under gravity, closing the test slot to clamp and fix the workpiece. The entire process requires no additional flipping drive mechanism to complete the opening and closing of the fixture, simplifying the structure of the transfer fixture, reducing the number of moving parts, lowering the probability of equipment failure during operation, and ensuring that the fixture's opening and closing actions are naturally synchronized with the conveyor belt's station rotation, eliminating additional waiting time and improving the efficiency of the loading and unloading processes.

[0017] 3. The layout separates the transfer tooling from the testing module. The workpiece-bearing plate and testing seat rotate continuously with the conveyor belt. The testing connection end and conductive connection end are fixedly mounted on the receiving seat at the testing station, eliminating the need for repeated transfer with the workpiece and reducing the number of insertions and removals at the testing contact ends. During testing, the electrical path is opened and closed by the translational movement of the sliding block. The contact process is a smooth surface-to-surface fit, eliminating the impact wear caused by vertical insertion and removal. This also avoids dielectric adhesion and surface oxidation caused by frequent entry and exit of the contact end from the silicone oil environment, maintaining the conductivity of the contact end surface. Furthermore, a single lifting electric cylinder can sequentially complete multiple steps of tooling transfer, electrical connection, and oil bath immersion, reducing the number of independent drive mechanisms, lowering the complexity of multi-mechanism collaborative control, and improving the overall operational reliability of the equipment. It can also coordinate with the intermittent rotation of the conveyor belt to achieve orderly connection of multiple stations, ensuring continuous operation of the testing work. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the assembled structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention after it has been unfolded; Figure 3 This is a schematic diagram of the assembled operating structure in this invention; Figure 4 This is a schematic diagram of the disassembled operating structure in this invention; Figure 5 This is a schematic diagram of the structure when the feeding plate and the test seat are located at the receiving position in this invention; Figure 6 yes Figure 5 A schematic diagram of the disassembled structure; Figure 7 This is a schematic diagram of the structure when the feeding plate and the test seat are in the engagement position in this invention; Figure 8 yes Figure 7 A schematic diagram of the disassembled structure; Figure 9 This is a schematic diagram of the structure when the test connection end and the conductive connection end are in the connection position in this invention; Figure 10 yes Figure 9 A schematic diagram of the disassembled structure; Figure 11 This is a schematic diagram of the structure when the conductive post is located at the connection position in this invention; Figure 12 This is a schematic diagram of the structure of the feeding plate, test seat and conductive post in the test position in this invention; Figure 13 This is a schematic diagram of the structure when the T-shaped moving plate is located at the upper stop point of the linear module in this invention; Figure 14 This is a schematic diagram of the structure when the T-shaped moving plate is located at the lower stop point of the linear module in this invention; Figure 15 yes Figure 13 A schematic diagram of the disassembled structure.

[0019] In the diagram, the correspondence between component names and drawing numbers is as follows: 101. Test base; 102. Control module; 103. Feeding arm; 104. Discharge arm; 201. Discharge plate; 202. Test base; 203. Conveyor belt; 204. Test slot; 205. Discharge bracket; 206. Mounting plate; 207. First connecting block; 208. First connecting slot; 209. Sliding block; 210. Second connecting slot; 211. Second connecting block; 212. Sliding slot; 213. Mounting slot; 214. Switching motor; 215. Moving wheel; 216. Friction sleeve; 217. Moving block; 218. Stepper motor; 219. Mounting bracket ; 220, Infrared sensor; 221, Fixed bracket; 222, Linear module; 223, T-shaped moving plate; 224, Clamping cylinder; 225, Clamping plate; 226, Fixed frame; 227, Fixed column; 228, Fixed hole; 301, Test connection end; 302, Conductive connection end; 303, Tester; 304, Conductive column; 305, Test fixture; 306, Oil tank; 308, Sealing sliding sleeve; 309, Lifting electric cylinder; 310, Receiver; 311, Mounting hole; 312, First connection end; 313, Second connection end; 314, Connection terminal. Detailed Implementation

[0020] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the technical solutions of the present invention, but should not be used to limit the scope of protection of the present invention.

[0021] Example:

[0022] As attached Figures 1 to 15 As shown: This invention provides a PTC thermistor testing device for thermistor testing, including a test base 101. The test base 101 has a testing structure and a running structure on its top. The running structure includes multiple sets of feeding plates 201 and test seats 202 located at receiving positions, fastening positions, or testing positions respectively. A conveyor belt 203 is arranged above the test base 101, driving the feeding plates 201 and test seats 202 to rotate intermittently between the receiving positions, fastening positions, and testing positions. Multiple sets of test seats 202 are evenly spaced along the periphery of the conveyor belt 203. The side of each test seat 202 is rotatably connected to one end of the corresponding feeding plate 201 via a rotating seat and a rotating shaft. The feeding plates 201 and test seats 202... 02. A recessed test groove 204 is correspondingly formed on the adjacent side of the plate. The inner contour of the test groove 204 matches the external dimensions of the PTC thermistor, used to support and limit the PTC thermistor. When the feeding plate 201 and the test base 202 are in the receiving position, both are located on the side of one end of the conveyor belt 203. The feeding plate 201 rotates downwards around its end axis until it is perpendicular to the test base 202, fully opening the slot of the test groove 204 to receive the PTC thermistor being tested. When the feeding plate 201 and the test base 202 are in the engaging position, they move with the conveyor belt 203 to the top horizontal section of the conveyor belt 203. The feeding plate 201 rotates around its end pivot until it is parallel to the test base 202, causing the corresponding test slots 204 on both sides to engage with each other, thus clamping and fixing the PTC thermistor and limiting the workpiece's positional displacement during transfer and testing. When the feeding plate 201 and the test base 202 are in the test position, they are located inside the oil tank 306 at the top of the test base 101, completely submerged below the surface of the constant-temperature silicone oil, allowing the PTC thermistor to be immersed in the constant-temperature silicone oil for uniform heating, simulating test environments at different temperatures. The test structure includes multiple sets of test connection terminals 301 and conductive connection terminals 302 located at connection positions or test positions. When the test connection terminal 301 and the conductive connection terminal 302 are connected... When terminal 302 is in the connection position, test connection terminal 301 is connected to the mating end at the bottom of test base 202, and the feeding plate 201 is clamped between test connection terminal 301 and test base 202. Test connection terminal 301 is in contact with the lead wire at one end of PTC thermistor, forming a stable electrical connection path. When test connection terminal 301 and conductive connection terminal 302 are in the test position, conductive connection terminal 302 is connected to test connection terminal 301, and conductive connection terminal 302 is connected to the test instrument 303 in test base 101 for detecting the resistance value of PTC thermistor. Control module 102 is assembled in the receiving cavity in test base 101, and control module 102 is electrically connected to the operating structure and test structure.

[0023] In this embodiment, when the test seat 202 and the feeding plate 201 are located at the bottom of the conveyor belt 203, the feeding plate 201 rotates under its own weight to be perpendicular to the test seat 202, thereby opening the test slot 204; when the test seat 202 and the feeding plate 201 move to the receiving position on one side of the conveyor belt 203, the feeding arm 103 places the PTC thermistor in the test slot 204 of the feeding plate 201; when the test seat 202 and the feeding plate 201 move to the fastening position at the top of the conveyor belt 203, the feeding plate 201 rotates under its own weight to cover the test seat 202 and close the test slot 204.

[0024] The test structure also includes multiple sets of conductive posts 304 located at connection or test positions. All sets of conductive posts 304 are arranged vertically, and the top end face of all conductive posts 304 is fixedly connected to the bottom end face of the test fixture 305. The test fixture 305 is a horizontally positioned support plate structure used to synchronously transmit lifting power, driving all conductive posts 304 to maintain the same stroke of lifting. The top of the test base 101 has a recessed oil tank 306, which holds the silicone oil used in the test, providing a constant-temperature oil bath testing environment for the PTC thermistor. The bottom of the oil tank 306 has multiple sets of through sliding holes corresponding to the positions of each set of conductive posts 304. Sealing sliding sleeves 308 are fixedly installed on the inner walls of each set of sliding holes. The inner ring wall of the sealing sliding sleeve 308 slides against the outer peripheral wall of the conductive post 304, maintaining a dynamic seal at the bottom of the oil tank 306 during the reciprocating lifting and lowering of the conductive post 304, preventing silicone oil from leaking outwards along the gaps in the sliding holes. The lifting action of the conductive column 304 is provided with radial guidance constraint to limit the lateral displacement of the conductive column 304 during movement. Multiple sets of conductive columns 304 are slidably inserted into the interior of multiple sets of sealing sliding sleeves 308. A lifting electric cylinder 309 is provided on the outer side of the bottom of the oil tank 306. The lifting electric cylinder 309 is used to drive the conductive column 304 to switch between the connection position and the test position. The lifting electric cylinder 309 is connected to one of the sets of conductive columns 304. A receiving seat 310 is fixedly provided on the top of the test fixture 305 corresponding to the position of each test station. Multiple sets of test connection ends 301 are fixedly installed on the top of multiple sets of receiving seats 310. The receiving seats 310 are used to receive and position the test seat 202 transferred to the test station, ensuring that the test connection end 301 corresponds to the docking end of the bottom of the test seat 202. The lifting electric cylinder 309 is electrically connected to the control module 102, which controls the start / stop, extension / retraction direction and stroke control commands.

[0025] In this embodiment, after the test seat 202 and the feeding plate 201 move along the conveyor belt 203 to the top of the test station and the conveyor belt 203 stops, the lifting electric cylinder 309 starts, driving the corresponding conductive post 304 to slide upward along the inner ring of the sealing sliding sleeve 308. The conductive post 304 drives all other conductive posts 304 to move upward synchronously through the test fixture 305, so that each set of receiving seats 310 rises synchronously to the connection position that is in contact with the bottom of the corresponding test seat 202. After the test seat 202 and the receiving seat 310 are fixedly connected and the test connection end 301 is docked with the corresponding conductive connection end 302, the control module 102 controls the lifting electric cylinder 309 to retract, driving the conductive post 304 and the test fixture 305 to retract. The fixture 305 moves downwards synchronously, and the receiving seat 310 drives the test seat 202 and the discharge plate 201 to descend synchronously to the test position inside the oil tank 306, so that the PTC thermistor is completely immersed below the surface of the silicone oil for constant temperature heating test; the structure in which the top of multiple sets of lifting electric cylinders 309 are all connected to the test fixture 305 allows a single conductive column 304 driven by the lifting electric cylinder 309 to drive multiple conductive columns 304 to move together through the test fixture 305, without the need to configure an independent drive mechanism for each set of conductive columns 304, reducing the number of drive components, while ensuring that the lifting action of all test positions is completely synchronized, avoiding misalignment or differences in silicone oil immersion depth caused by inconsistent lifting strokes at different positions.

[0026] The conveyor belt 203 is a chain conveyor belt, which is composed of chain links on both sides and a middle bearing connector. It has strong load-bearing capacity and stable intermittent conveying characteristics. Multiple sets of material feeding brackets 205 are fixedly installed at equal intervals on both sides of the chain conveyor belt. Multiple sets of mounting plates 206 are horizontally fixed between the multiple sets of material feeding brackets 205 on both sides. Each set of mounting plates 206 supports a set of test seats 202, which is used to drive the test seats 202 to complete the flow and conveying of each station synchronously with the conveyor belt 203. Two sets of first connecting blocks 207 are fixedly installed on the side of the mounting plate 206 near the test seat 202. A first connecting groove 208 is opened on the adjacent side of the two sets of first connecting blocks 207. A sliding groove 212 is opened inside the test seat 202 corresponding to the position of the two sets of first connecting grooves 208. A sliding block 209 is slidably disposed in the sliding groove 212. The sliding block 209 can reciprocate along the axis of the sliding groove 212. Second connecting grooves 210 are provided on the inner walls on both sides of the receiving seat 310, corresponding to the positions of the two sets of sliding blocks 209. One end of the sliding block 209 can be selectively inserted into the first connecting groove 208 or the second connecting groove 210 to achieve selective connection and fixation between the test seat 202 and the mounting plate 206 or the receiving seat 310. When the end of the sliding block 209 is inserted into the first connecting groove 208, the test seat 202 and the mounting plate 206 remain relatively fixed and complete the station flow synchronously with the conveyor belt 203. When the end of the sliding block 209 is inserted into the second connecting groove 210, the test seat 202 and the receiving seat 310 remain relatively fixed and complete the lifting action synchronously with the conductive column 304.

[0027] In this embodiment, when the conductive post 304 is in the connection position, the top surface of the receiving seat 310 contacts the bottom surface of the test seat 202, the first connecting groove 208 and the second connecting groove 210 are located on the same horizontal axis, and one end of the sliding block 209 passes through the first connecting groove 208 or the second connecting groove 210; when the conductive post 304 is in the test position, the receiving seat 310 drives the test seat 202 to descend with the conductive post 304 to the set depth inside the oil tank 306, one end of the sliding block 209 passes through the second connecting groove 210, and the other end remains in the sliding groove 212 of the test seat 202, which is used to fix the test seat 202 on the receiving seat 310 and move up and down synchronously with the conductive post 304 to complete the silicone oil immersion test. In this state, the position of the test seat 202 is completely constrained by the receiving seat 310 and is not affected by the operation of the conveyor belt 203, which can ensure that the position of the workpiece is stable during the test and there will be no shaking or displacement.

[0028] One side of the test base 202 is connected to the side end face of the mounting plate 206 via two sets of second connecting blocks 211. Two sets of horizontally extending sliding grooves 212 are provided on the side end face of the test base 202 adjacent to the two sets of second connecting blocks 211. The axes of the two sets of sliding grooves 212 are parallel to each other. Two sets of sliding blocks 209 are slidably inserted into the interiors of the two sets of sliding grooves 212, ensuring that the ends of the sliding blocks 209 can be accurately aligned with the corresponding first connecting groove 208 and second connecting groove 210. A mounting groove 213 is provided on the top of the mounting plate 206. A switching motor 214 is fixedly installed in the mounting groove 213. The switching motor 214 outputs rotational power to drive the sliding blocks 209 to reciprocate along the sliding grooves 212, allowing one end of the sliding block 209 to selectively pass through either the first connecting groove 208 or the second connecting groove 210. The main shaft end of the switching motor 214... The fixed assembly is fitted with a movable wheel 215, and a friction sleeve 216 is fixedly wrapped around the outer peripheral wall of the movable wheel 215. The friction sleeve 216 is made of wear-resistant and insulating material to increase the friction of the transmission contact surface. A protruding movable block 217 is provided on the side of the sliding block 209. A through slot is opened on the second connecting block 211 and the mounting plate 206 at the position corresponding to the movable block 217. The movable block 217 extends through the through slot into the mounting groove 213. The side end face of the movable block 217 is in close contact with the outer peripheral wall of the friction sleeve 216. Power is transmitted through friction. The through slot is used to provide clearance for the translational movement of the movable block 217, and at the same time limit the translational stroke of the movable block 217 to prevent the sliding block 209 from moving out of the range. The switching motor 214 is connected to the first connecting end 312 on the top of the mounting plate 206 through a wiring.

[0029] The top of the mounting plate 206 has two sets of mounting holes 311, each containing a first connecting end 312. The upper and lower ends of the first connecting ends 312 extend to the outer sides of the top and bottom surfaces of the mounting plate 206, respectively. The upper ends of the two sets of first connecting ends 312 are electrically connected to two sets of switching motors 214 via wiring to transmit drive power and motion control signals to the switching motors 214. Two sets of second connecting ends 313 are fixedly installed on the top surfaces of both sides of the receiving base 310, corresponding to the positions of the two sets of first connecting ends 312. The positions of the second connecting ends 313 are vertically aligned with the first connecting ends 312, allowing them to contact the lower surfaces of the first connecting ends 312 when the receiving base 310 rises to the docking height. To achieve electrical conduction, the conductive post 304 is a hollow cylindrical structure with mutually insulated power supply and test paths arranged in its internal cavity. The power supply path is used to independently transmit drive power and control signals, while the test path is used to independently transmit resistance detection signals. The two types of paths are isolated from each other to avoid signal interference. A connection terminal 314 is fixedly installed at the bottom of the conductive post 304. The connection terminal 314 includes independently arranged power supply terminal groups and test terminal groups. The lower ends of the two sets of second connection terminals 313 are electrically connected to the power supply path inside the conductive post 304 through internal wiring that passes through the receiving base 310 and the test fixture 305, respectively. The lower end of the test connection terminal 301 is electrically connected to the test path inside the conductive post 304 through internal wiring.

[0030] In this embodiment, when the conductive post 304 is in the connection position, the top surface of the receiving seat 310 is in contact with the bottom surface of the test seat 202, and the first connection end 312 and the second connection end 313 are correspondingly connected and conductive. At the same time, the power supply terminal group in the connection terminal 314 at the bottom of the conductive post 304 is correspondingly connected to the power supply output terminal of the control module 102. The test terminal group is in a suspended state without being connected to the test instrument 303. The control module 102 can transmit power and control commands to the switching motor 214 through the power supply path, the second connection end 313, and the first connection end 312, controlling the switching motor 214 to rotate the moving wheel 215. Through friction transmission, the sliding block 209 is driven to move and switch along the sliding groove 212 between the first connection groove 208 and the second connection groove 210. At the same time, the conductive connection end 302 at the bottom of the test seat 202 and the... The test connection end 301, located on the top of the receiving seat 310, is correspondingly attached to complete the electrical connection at the front end of the test circuit. When the conductive post 304 is in the test position, the conductive post 304 drives the receiving seat 310 and the test seat 202 to descend synchronously and immerse themselves in the silicone oil in the oil tank 306. The test terminal group in the connection terminal 314 is correspondingly connected to the detection interface of the tester 303. The power supply terminal group can maintain the conducting state to maintain the locking force of the switching motor 214, so that the tester 303 can form a complete closed test circuit through the test path, the conducting connection end 302, the test connection end 301 and the lead wires at both ends of the PTC thermistor in the test tank 204. This circuit is used to continuously detect the real-time resistance data of the PTC thermistor as the silicone oil temperature changes. The detected resistance data can be transmitted back to the control module 102 for storage and judgment.

[0031] Specifically, the power supply terminal of the control module 102 is connected to the switching motor 214 through the power supply terminal group of the connection terminal 314, the power supply path inside the conductive post 304, the second connection terminal 313, and the first connection terminal 312, to control the start of the switching motor 214 and the rotation direction of the spindle, thereby controlling the translation direction and stroke of the sliding block 209. When the control module 102 outputs a forward rotation command, the switching motor 214 drives the sliding block 209 to move towards the receiving seat 310, so that the sliding block 209 gradually disengages from the first connecting groove 208 and its end passes through the second connecting groove 210, completing the disconnection between the test seat 202 and the mounting plate 206, and simultaneously realizing the test. The base 202 is fixedly connected to the receiving base 310; after the sliding block 209 moves to the set stroke, the switching motor 214 stops running and remains locked to maintain the stability of the connection structure. Then, the control module 102 outputs a command to start the lifting electric cylinder 309, driving the conductive column 304 to descend from the connection position to the test position at a uniform speed. At the same time, it drives the feeding plate 201 and the test base 202 to move down to the test position in sync, so that the PTC thermistor is completely immersed in the silicone oil for constant temperature heating. After descending to the position, the test terminal group of the connecting terminal 314 is connected to the detection interface of the tester 303, so that the tester 303 can continuously detect the resistance data of the PTC thermistor through the complete test circuit.

[0032] The operating structure also includes a stepper motor 218 for driving the conveyor belt 203. A mounting bracket 219 is vertically mounted on the top of the test base 101. The drive shaft and driven shaft of the conveyor belt 203 are rotatably mounted on the inner sides of both ends of the mounting bracket 219 via bearing assemblies, so that the conveyor belt 203 is entirely supported above the oil tank 306. The body of the stepper motor 218 is fixedly mounted on the outer wall of one side of the mounting bracket 219. The output shaft end of the stepper motor 218 is coaxially connected to the end of the drive shaft of the conveyor belt 203. The stepper motor 218 can receive pulse control signals. The system completes a fixed-angle indexing rotation, with each rotation corresponding to a fixed angular displacement, which drives the conveyor belt 203 to move a set distance, so that multiple test seats 202 on the conveyor belt 203 pass through the receiving position in sequence, realizing intermittent rotary conveying; an infrared sensor 220 is fixedly installed on one side of the mounting bracket 219 at the position corresponding to the receiving position. The detection end of the infrared sensor 220 faces the side of the conveyor belt 203 and is used to detect the test seats 202 or mounting plates 206 passing through the receiving position and collect the arrival detection signal. Both the stepper motor 218 and the infrared sensor 220 are electrically connected to the control module 102.

[0033] In this embodiment, the control module 102 outputs a pulse drive signal to the stepper motor 218. After receiving the signal, the stepper motor 218 drives the drive shaft of the conveyor belt 203 to rotate, causing the conveyor belt 203 to start driving the flow of each set of feeding plates 201 and test seats 202. When the infrared sensor 220 detects that a set of test seats 202 has moved to the corresponding position of the receiving position, it sends a positioning signal back to the control module 102. After receiving the positioning signal, the control module 102 stops outputting pulses to the stepper motor 218, the stepper motor 218 stops running and remains locked, and the conveyor belt 203 remains stationary, causing the set of feeding plates 201 and test seats 202 to move. The device remains at the receiving position, waiting for the PTC thermistor to be placed. After the material is placed, the control module 102 outputs a pulse signal to the stepper motor 218 again. The stepper motor 218 drives the conveyor belt 203 to continue rotating for the corresponding distance, so that the next set of test seats 202 moves to the receiving position. At the same time, the test seats 202 that have completed the material placement move towards the fastening position with the conveyor belt 203. This cycle is repeated to achieve continuous flow testing of multiple sets of workpieces. The real-time detection of the infrared sensor 220 can verify the operating position of the stepper motor 218, avoiding positional deviations caused by long-term operation that lead to misalignment of workstations, and ensuring that the process actions of each workstation can be properly connected and executed.

[0034] A fixed bracket 221 is fixedly installed on the top of the mounting bracket 219. The fixed bracket 221 spans above the fastening position on the top of the conveyor belt 203. A linear module 222 is vertically fixedly installed on the inner side of the fixed bracket 221. The linear module 222 adopts an electrically driven linear transmission structure and can output stable vertical reciprocating power. A T-shaped moving plate 223 is fixedly installed on the sliding slider of the linear module 222. The vertical section of the T-shaped moving plate 223 is connected and fixed to the slider. Two sets of clamping cylinders 224 are fixedly installed on the horizontal plate surface at the bottom of the T-shaped moving plate 223. The movable pneumatic clamping blocks at the bottom of the two sets of clamping cylinders 224 are respectively connected to two sets of clamping plates 225. The two sets of clamping plates 225 are arranged in parallel and opposite directions. Multiple sets of fixed frames 226 are arranged side by side along the conveyor belt 203. The clamping cylinder 224 is used to drive two sets of clamping plates 225 to open and close in the horizontal direction, so as to clamp or release the multiple sets of fixed frames 226 between the two sets of clamping plates 225, so as to realize the rapid installation of the test component. Test connection ends 301 are fixedly provided at the bottom of both ends of the multiple sets of fixed frames 226. A fixed post 227 is vertically provided on one side of each set of test connection ends 301. Fixed holes 228 are opened at the corresponding positions of the top of the feeding plate 201 and the test seat 202. The stepper motor 218, infrared sensor 220, linear module 222 and clamping cylinder 224 are all electrically connected to the control module 102.

[0035] In this embodiment, when the conveyor belt 203 drives the test seat 202 and the feeding plate 201 to pass through the engagement position normally, the T-shaped moving plate 223 is located at the upper stop position of the linear module 222. The two sets of clamping cylinders 224 remain in a clamping state, driving the two sets of clamping plates 225 to clamp the fixing frame 226 together with the T-shaped moving plate 223 to a high position, so that the test connection end 301 and the fixing column 227 are completely separated from the top surface of the feeding plate 201 and the test seat 202, in order to avoid the workpiece rotation of the conveyor belt 203. To avoid interference from the upper structure with the transfer tooling, and to ensure that the conveyor belt 203 can continuously drive multiple sets of tooling to complete the station rotation; when the set test seat 202 is in the fastening position, the control module 102 controls the stepper motor 218 to stop running, so that the conveyor belt 203 remains stationary, and the test seat 202 and the feeding plate 201 remain directly below the fastening position. The control module 102 controls the linear module 222 to drive the T-shaped moving plate 223 to move vertically downward. When the T-shaped moving plate 223 moves to the linear module 22... When the bottom stop position of 2 is reached, the fixing post 227 is inserted into the fixing hole 228 at the top of the feeding plate 201 and the test seat 202 to complete the positioning calibration, limiting the horizontal relative displacement of the feeding plate 201 and the test seat 202. At the same time, the conductive part at the bottom of the test connection end 301 is attached to the surface of the lead wires at both ends of the PTC thermistor to form a stable electrical contact. The control module 102 controls the two sets of clamping cylinders 224 to drive the two sets of pneumatic clamping blocks to drive the two sets of clamping plates 225 to open outward, so that the two sets of clamping plates 225 open outward. 25 separates from the fixed frame 226 and no longer applies clamping force to the fixed frame 226. Then, the control module 102 controls the linear module 222 to drive the clamping plate 225 and the T-shaped moving plate 223 back to the upper stop point. The fixed frame 226 and the test connection end 301 remain on the top of the test seat 202. The pressure and conduction state is maintained by the limit of the fixed column 227. The plate flows along the conveyor belt 203 with the test seat 202 to the test station, and completes the connection of the resistance detection circuit with the test structure at the bottom.

[0036] A feeding arm 103 is provided on one side of the operating structure, corresponding to the receiving position of the conveyor belt 203. The feeding arm 103 is electrically connected to the control module 102, and transports the PTC thermistor to be tested in the feeding channel to the receiving position of the operating structure, placing it into the test slot 204 of the discharge plate 201 which is in the open state. A discharging arm 104 is provided on the other side of the operating structure, corresponding to the discharging position of the conveyor belt 203. The discharging arm 104 is electrically connected to the control module 102, and removes the PTC thermistor that has been tested from the test slot 204 on the operating structure and transports it to the receiving position of the conveyor belt 203. The corresponding collection area at the discharge end; a heater and a temperature sensor are installed in the oil tank 306. Both the heater and the temperature sensor are electrically connected to the control module 102. The heater is used to heat the silicone oil in the oil tank 306 to increase the overall temperature of the silicone oil. The temperature sensor is used to detect the temperature data of the silicone oil in the oil tank 306 in real time and transmit it back to the control module 102. The control module 102 can adjust the output power of the heater according to the preset test temperature threshold to form a closed-loop temperature control circuit, maintain the silicone oil temperature in a stable test range, and provide a consistent temperature environment for the resistance characteristic detection of PTC thermistors.

[0037] After the test is completed, the control module 102 activates the lifting electric cylinder 309 to drive the conductive column 304 to rise from the test position to the connection position. After rising to the position, the top surface of the receiving seat 310 is in contact with the bottom surface of the test seat 202, so that the second connecting groove 210, the sliding groove 212, and the first connecting groove 208 are on the same horizontal axis. At the same time, the first connecting end 312 and the second connecting end 313 are in a connected state. The control module 102 outputs a reverse rotation command to the switching motor 214 through the power supply path inside the conductive column 304, and starts the switching motor 214 to rotate the moving wheel 215 in the reverse direction. The friction sleeve 216 on the outside of the moving wheel 215 drives the sliding block 209 along the sliding groove 212 towards the mounting plate 20 through friction transmission with the moving block 217. 6. The sliding block 209 moves to one side, causing its end to gradually detach from the second connecting groove 210 and completely pass through the first connecting groove 208. This releases the connection between the test seat 202 and the receiving seat 310, allowing the test seat 202 to re-establish a stable connection with the mounting plate 206. After the sliding block 209 moves to the set stroke, the switching motor 214 stops operating and remains locked, maintaining the current connection state. Then, the control module 102 outputs a descent command to the lifting electric cylinder 309, driving the conductive column 304 to descend from the connection position to the initial low position. The receiving seat 310 descends synchronously and separates from the bottom of the test seat 202. The first connecting end 312 and the second connecting end 313 are electrically disconnected. At this time, the test seat 202 and the feeding plate 201 are completely separated by the mounting plate 206. Plate 206 carries the load and can continue to flow with conveyor belt 203; then control module 102 controls stepper motor 218 to drive conveyor belt 203 to move the test seat 202 and the unloading plate 201 to the top engagement position. Stepper motor 218 stops running, conveyor belt 203 remains stationary, control module 102 controls linear module 222 to vertically lower T-shaped moving plate 223 to the set height, two sets of pneumatic clamping blocks drive two sets of clamping plates 225 to close inward, clamping the two end faces of multiple sets of fixed frames 226, completing the positioning and clamping of fixed frames 226. Afterwards, linear module 222 drives T-shaped moving plate 223 and fixed frames 226 to rise synchronously, so that fixed column 227 completely disengages from fixed hole 228, test connection end 30 1. The PTC thermistor leads are simultaneously disconnected, releasing the top fixing constraint on the feeding plate 201 and the test holder 202. The stepper motor 218 is restarted to drive the conveyor belt 203 to continue running, moving the test holder 202 and the feeding plate 201 towards the end of the discharge arm 104. When the fixture moves to the discharge position at the end of the conveyor belt 203, the PTC thermistor in the test slot 204 of the discharge arm 104 is taken out and transported to the corresponding collection area at the discharge end, completing the full process test of a single workpiece. After the discharge is completed, the discharge arm 104 is reset, and the unloaded feeding plate 201 and the test holder 202 continue to rotate with the conveyor belt 203, moving to the receiving position to wait for the next feeding operation. This cycle is used to realize the continuous automated testing of multiple PTC thermistors.

[0038] The specific usage and function of this embodiment: The stepper motor 218 rotates in an indexing manner to drive the conveyor belt 203 to operate, so that each set of test seats 202 passes through each station in sequence; when the test seat 202 and the feeding plate 201 move to the bottom section with the conveyor belt 203, the feeding plate 201 rotates downward around the axis under its own gravity to a state perpendicular to the test seat 202, so that the test slot 204 is fully opened. When the two move to the receiving position on one side of the conveyor belt 203, an infrared sensor 220 is set on one side of the mounting bracket 219 corresponding to the receiving position to detect the position status of the test seat 202. The feeding arm 103 transports the PTC thermistor to be tested at the feeding end to the receiving position and puts it into the open test slot 204. The test seat 202 and the feeding plate 201, which have completed the feeding, continue to flow with the conveyor belt 203 to the fastening position of the top horizontal section. The feeding plate 201 rotates back to a state parallel to the test seat 202 under its own gravity. The test slots 204 on the sides interlock to clamp and fix the PTC thermistor inside. When the test seat 202 carrying the workpiece stops directly below the interlocking position, the control module 102 controls the linear module 222 to drive the T-shaped moving plate 223 to descend vertically. During the descent, the fixing post 227 is inserted into the fixing hole 228 to restrict the horizontal displacement of the feeding plate 201 and the test seat 202 from the top. At the same time, the bottom conductive part of the test connection end 301 is in contact with the lead wires at both ends of the PTC thermistor to form electrical contact. The control module 102 controls the two sets of clamping cylinders 224 to drive the clamping plate 225 to open outward, releasing the clamping constraint on the fixing frame 226. The linear module 222 drives the clamping plate 225 and the T-shaped moving plate 223 to rise back to the upper stop point. The fixing frame 226 and the test connection end 301 remain on the top of the test seat 202 by the limitation of the fixing post 227, maintaining the pressed and conductive state and flowing to the test station together with the test seat 202.

[0039] After the test stand 202 is conveyed by the conveyor belt 203 to the test station, the conveyor belt 203 stops running. The lifting electric cylinder 309 drives the conductive column 304 to rise along the sealing sliding sleeve 308 to the connection position. The top surface of the receiving seat 310 is in contact with the bottom surface of the test stand 202. The first connection end 312 and the second connection end 313 are connected and connected. The power supply terminal group at the bottom of the conductive column 304 is connected to the power supply output terminal of the control module 102. The control module 102 outputs a forward rotation command to the switching motor 214. The switching motor 214 drives the moving wheel 215 to rotate. Through the friction transmission between the friction sleeve 216 and the moving block 217, the sliding block 209 is pushed to move along the sliding groove 212, so that the end of the sliding block 209 gradually disengages from the first connection end 212. The connecting groove 208 is inserted into the second connecting groove 210, completing the fixed connection between the test seat 202 and the receiving seat 310. At the same time, the connection constraint between the test seat 202 and the mounting plate 206 is released. The switching motor 214 stops running and remains locked. The lifting electric cylinder 309 drives the conductive column 304, the test fixture 305 and the receiving seat 310 to descend to the test position simultaneously. The test seat 202 and the discharge plate 201 are immersed in the constant temperature silicone oil in the oil tank 306. The test terminal group of the connecting terminal 314 is connected to the tester 303. The tester 303 forms a complete closed test circuit with the PTC thermistor through the test path, the conductive connecting terminal 302, the test connecting terminal 301, and continuously collects real-time resistance data at different oil temperatures.

[0040] After the test is completed, the control module 102 controls the lifting electric cylinder 309 to drive the conductive column 304 back to the connection position. The connection terminal 314 reconnects with the power supply terminal of the control module 102. The control module 102 outputs a reverse rotation command to drive the switching motor 214 to rotate in the reverse direction, causing the sliding block 209 to move in the reverse direction, disengage from the second connection slot 210, and re-enter the first connection slot 208, so that the test seat 202 is fixedly connected to the mounting plate 206. Subsequently, the lifting electric cylinder 309 drives the conductive column 304 to descend to the initial low position, the receiving seat 310 separates from the bottom of the test seat 202, and the first connection end 312 and the second connection end 313 are electrically disconnected. In this process, the electrical disconnection is completed before the mechanical separation, further reducing the risk of electrolytic corrosion of the contact surface. The conveyor belt 203 continues to operate, driving the tested test base 202 and the unloading plate 201 back to the engagement position. The linear module 222 drives the T-shaped moving plate 223 to descend to the corresponding height. The clamping cylinder 224 drives the two sets of clamping plates 225 to close inward, clamping multiple sets of fixed frames 226. Then, the linear module 222 drives the T-shaped moving plate 223 and the fixed frames 226 to rise synchronously, causing the fixed column 227 to disengage from the fixed hole 228. The test connection end 301 simultaneously disengages from the lead wire of the PTC thermistor, releasing the top constraint on the unloading plate 201 and the test base 202. Subsequently, the conveyor belt 203 drives the tooling to continue to the discharge position. The discharge arm 104 removes the tested PTC thermistor from the test tank 204 and transports it to the corresponding collection area at the discharge end. This cycle realizes continuous automated testing of multiple sets of PTC thermistors, improving the efficiency and stability of batch testing.

[0041] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A PTC thermistor testing device for thermistor testing, characterized in that, include: The test base has a test structure and an operating structure on its top. The operating structure includes multiple sets of feeding plates and test seats located at receiving positions, fastening positions, or testing positions. A conveyor belt is installed above the test base to drive the feeding plates and test seats to rotate intermittently between the receiving, fastening, and testing positions. Multiple test seats are arranged around the conveyor belt. The feeding plates and test seats are rotatably connected. Test slots for supporting PTC thermistors are correspondingly opened on adjacent sides of the feeding plates and test seats. When the feeding plates and test seats are in the receiving position, both are located at one end of the conveyor belt, perpendicular to each other, opening the test slots to receive the PTC thermistors. When the feeding plates and test seats are in the fastening position, they are parallel, closing the test slots to clamp and fix the PTC thermistors. When the feeding plates and test seats are in the testing position, both are located in an oil tank at the top of the test base, allowing the PTC thermistors to be immersed in constant-temperature silicone oil for heating. The test structure includes multiple sets of test connection terminals and conduction connection terminals located at connection positions or test positions. When the test connection terminal and conduction connection terminal are in the connection position, the test connection terminal is connected to the test base, the feeding plate is clamped between the test connection terminal and the test base, and the test connection terminal is in contact with the lead wire of one end of the PTC thermistor. When the test connection terminal and conduction connection terminal are in the test position, the conduction connection terminal is connected to the test connection terminal, and the conduction connection terminal is connected to the tester in the test base for detecting the resistance value of the PTC thermistor. The control module is electrically connected to the operating structure and the test structure.

2. The PTC thermistor testing device for thermistor testing according to claim 1, characterized in that: The test structure also includes multiple sets of conductive posts located at connection positions or test positions. The tops of the conductive posts are all connected to the test fixture. The top of the test base is provided with an oil tank for holding silicone oil. Multiple sets of sliding holes are opened at the bottom of the oil tank. Each set of sliding holes is equipped with a sealing sliding sleeve. The conductive posts slide through the sealing sliding sleeves. The bottom of the oil tank is provided with a lifting electric cylinder for driving the conductive posts to move up and down between the connection position and the test position. The lifting electric cylinder is connected to one of the conductive posts. The top of the test fixture is provided with multiple sets of receiving seats. Multiple test connection ends are respectively installed on the multiple sets of receiving seats. The lifting electric cylinder is electrically connected to the control module.

3. The PTC thermistor testing device for thermistor testing according to claim 2, characterized in that: The conveyor belt is a chain conveyor belt. Multiple sets of feeding brackets are arranged on the periphery of both sides of the chain conveyor belt. Multiple sets of mounting plates are arranged between the multiple sets of feeding brackets on both sides. Two sets of first connecting blocks are arranged on one side of the mounting plate. A first connecting groove is opened on the side of the two sets of first connecting blocks near the test seat. A sliding block is slidably arranged in the test seat corresponding to the first connecting groove. A second connecting groove is opened on the inner wall of both sides of the receiving seat corresponding to the two sets of sliding blocks. One end of the sliding block passes through the first connecting groove or the second connecting groove, which is used to achieve selective connection and fixation between the test seat and the mounting plate or the receiving seat.

4. A PTC thermistor testing device for thermistor testing according to claim 3, characterized in that: When the conductive post is in the connection position, the receiving seat is in contact with the test seat, the first connection groove and the second connection groove are on the same axis, and one end of the sliding block passes through the first connection groove or the second connection groove. When the conductive post is in the test position, the receiving seat and the test seat are located in the oil tank. One end of the sliding block is inserted into the second connecting groove to fix the test seat on the receiving seat and move up and down synchronously with the conductive post, detaching from the conveyor belt to complete the immersion test.

5. A PTC thermistor testing device for thermistor testing according to claim 3, characterized in that: One side of the test stand is connected to the mounting plate via two sets of second connecting blocks. A sliding groove is provided on the side of the test stand adjacent to the two sets of second connecting blocks. The two sets of sliding blocks slide through the two sets of sliding grooves respectively. The second connecting blocks and the top of the mounting plate are respectively provided with mounting grooves. A switching motor for driving one end of the sliding block to pass through the first or second connecting groove is provided in the mounting groove. The main shaft of the switching motor is provided with a moving wheel. A friction sleeve is provided on the outside of the moving wheel. A moving block is provided on the sliding block. The friction sleeve contacts the moving block.

6. A PTC thermistor testing device for thermistor testing according to claim 5, characterized in that: The mounting plate has two sets of mounting holes on the top, each with a first connection end. The two sets of first connection ends are electrically connected to the two sets of switching motors respectively. The receiving base has two sets of second connection ends on each side. The conductive post has a hollow structure with power supply and test paths arranged inside, used to transmit drive power and test signals respectively. The bottom of the conductive post has a connection terminal, and the two sets of second connection ends are electrically connected to the power supply path of the conductive post.

7. A PTC thermistor testing device for thermistor testing according to claim 6, characterized in that: When the conductive post is in the connection position, the connection terminal is connected to the power supply terminal of the control module, the first connection terminal and the second connection terminal are connected and conductive. The control module controls the switching motor to rotate the moving wheel, which drives the sliding block to move between the first connection groove and the second connection groove along the sliding groove. The test connection terminal is connected to the conductive connection terminal. When the conductive post is in the test position, the connection terminal is connected to the tester, enabling the tester to form a test circuit with the PTC thermistor through the test path, the conductive connection terminal, and the test connection terminal, which is used to detect the resistance data of the PTC thermistor as the temperature changes.

8. A PTC thermistor testing device for thermistor testing according to claim 1, characterized in that: The operating structure also includes a stepper motor for driving the conveyor belt. A mounting bracket is provided on the top of the test base. The conveyor belt is mounted on the mounting bracket. The stepper motor is mounted on one side of the mounting bracket. The shaft end of the stepper motor is connected to the drive shaft of the conveyor belt. The indexing rotation of the main shaft of the stepper motor is used to drive multiple sets of test bases on the conveyor belt to pass through the receiving position in sequence. An infrared sensor is provided on one side of the mounting bracket for detecting the test base passing through the receiving position.

9. A PTC thermistor testing device for thermistor testing according to claim 1, characterized in that: The mounting bracket has a fixed bracket at the top, and a linear module is vertically installed inside the fixed bracket. A T-shaped moving plate is installed on the slider of the linear module. Two sets of clamping cylinders are installed at the bottom of the T-shaped moving plate. Two sets of pneumatic clamping blocks at the bottom of the two sets of clamping cylinders are connected to the two sets of clamping plates respectively. Multiple sets of fixed frames are installed between the two sets of clamping plates. The clamping cylinders are used to drive the two sets of clamping plates to open and close to clamp or release the fixed frames. Test connection ends are provided at both ends of the multiple sets of fixed frames. A fixed post is provided on one side of the test connection end. The top of the feeding plate and the test seat are provided with fixed holes corresponding to the fixed posts. The stepper motor, infrared sensor, linear module and clamping cylinder are all electrically connected to the control module. When the T-shaped moving plate is at the upper stop of the linear module, the clamping plate and the fixed frame are lifted and disengaged from the feeding plate and the test seat to avoid the workpiece flow of the conveyor belt. When the T-shaped moving plate is at the lower stop point of the linear module, the fixing post is inserted into the corresponding fixing hole to complete the positioning, and the test connection end is attached to the lead wire of the PTC thermistor.

10. A PTC thermistor testing device for thermistor testing according to claim 1, characterized in that: A feeding arm is provided on one side of the operating structure. The feeding arm is used to transport the PTC thermistor to be tested from the feeding end to the receiving position of the operating structure. A discharging arm is provided on the other side of the operating structure. The discharging arm is used to transport the PTC thermistor that has been tested on the operating structure to the discharging end. The oil tank is equipped with a heater and a temperature sensor. The heater is used to heat the silicone oil in the oil tank, and the temperature sensor is used to detect the temperature data of the silicone oil in the oil tank.

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