Separated test equipment and test method

Abstract

The invention relates to the technical field of product test equipment, and discloses separated test equipment and a test method. According to the test equipment, when the movable test fixture in the separated test fixture moves along with the transfer platform, the transformer to be tested is driven to move to the position above the station of the fixed test fixture corresponding to each test process and is combined with the fixed test fixture corresponding to each test process, so that the test operation of different test processes is realized; according to the utility model, the situation of large-batch misjudgment caused by the fact that products are not in complete contact with a test circuit sometimes due to positioning errors caused by the fact that the products are transferred from one test station to another test station by traditional test equipment can be effectively avoided; meanwhile, the situation that the product is broken and damaged in the repeated moving and taking process is effectively avoided, the testing precision is greatly improved, and the loss of the product is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of product testing equipment, and in particular to a separate testing equipment and a testing method. Background Art

[0002] In recent years, with the rapid development of the electronic transformer industry, the electronic transformer production line has gradually developed from the traditional pure manual production line to the semi-automatic production line, and then to the current fully automated production line, making the electronic transformer manufacturing company develop from a labor-intensive enterprise to a fully automated heavy asset enterprise.

[0003] The testing process of electronic transformers is a key process to ensure their quality and is of great significance to the safety of transformer use. The testing process of electronic transformers generally includes multiple testing processes such as high voltage resistance test, interlayer test, resistance test, and comprehensive test. Due to the large number of testing processes, the traditional transformer testing process is completed by manual operation, and each process requires repeated loading and unloading, which wastes a lot of time and is inefficient.

[0004] A Chinese invention patent with authorization announcement number CN107600591B discloses a production line process for automatic inspection of finished transformers. The production line mainly uses multiple transfer robots to transfer transformers to various inspection stations for separate inspections of different test processes. Although the production line can reduce the errors of manual operations and accidental injuries to operators during the process and improve the production efficiency of the entire production line, the transformer needs to contact the probes on different test fixtures many times during the process of multiple grabbing and transferring the transformer to various test stations by different transfer robots. Since absolute consistency cannot be guaranteed during the grabbing and transfer process by different robots, errors are inevitable. Therefore, it cannot be guaranteed that the pins of the transformer can always be in good contact with the probes on the test fixtures of each inspection station, resulting in misjudgment of some inspection processes due to poor contact between the pins of the transformer and the probes on the test fixture. In addition, in the process of repeated grabbing, the robot is prone to cause certain damage to the transformer, which greatly increases the scrap rate and needs to be improved urgently. Summary of the invention

[0005] The purpose of the present invention is to provide a separate testing device and testing method, which can effectively avoid the situation where traditional testing equipment transfers a product from one testing station to another, and the positioning error caused by the product being moved back and forth and plugged in causes the product to sometimes not fully contact the test circuit and cause a large number of misjudgments. At the same time, it can also effectively avoid the situation where the product is broken or damaged during multiple removal processes, which not only greatly improves the test accuracy, but also greatly reduces the loss of the product.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A separate test device comprises a fixture platform, on which a plurality of separate test fixtures respectively used for different test processes and a transfer platform used to drive each separate test fixture to implement a corresponding test process on a transformer are arranged, each separate test fixture comprises a mobile test fixture and a fixed test fixture, the mobile test fixture is fixed on the transfer platform, the fixed test fixture is fixed on the fixture platform through a lifting and adjusting mechanism and connected to a test cable on the fixture platform, and a contact for connecting or disconnecting with a probe on the top of the fixed test fixture is arranged at the bottom of the mobile test fixture.

[0008] By adopting the above technical solution, the mobile test fixture in the separate test fixture moves with the transfer platform and moves with the transformer to be tested to the top of the station of the fixed test fixture corresponding to each test process and is respectively combined with the fixed test fixture corresponding to each test process, so as to realize the test operation of different test processes, that is, when the transformer to be tested is respectively moved to the top of the station of the fixed test fixture corresponding to each test process, the fixed test fixture corresponding to each test process is respectively driven by the lifting and adjusting mechanism to move upward, so that the probes on the top of the fixed test fixture corresponding to each test process are respectively in contact with the contacts at the bottom of the mobile test fixture loaded with the transformer to be tested. The mobile test fixture can be connected to the mobile test fixture to complete the test operations corresponding to each test process. The transformer to be tested always maintains good contact with the mobile test fixture during the process of moving from one test process to another. There is no need to move and plug back and forth, which effectively avoids the situation in which traditional test equipment transfers the product from one test station to another, and the positioning error caused by the back and forth movement and plugging of the product causes the product sometimes not fully contacting the test circuit and causing a large number of misjudgments. At the same time, it also effectively avoids the situation in which the product is broken or damaged during multiple removal processes, which not only greatly improves the test accuracy, but also greatly reduces the loss of the product.

[0009] The present invention is further configured as follows: each mobile test fixture includes a test board and a conversion board, the contacts are arranged at the bottom of the conversion board, the test board is provided with a slot for plugging with the pins of the transformer, the slot is opposite to the plug position at the upper end of the conversion board, and the plug is connected to the contacts at the bottom of the conversion board through a circuit.

[0010] By adopting the above technical solution, the test board is used to clamp and position the transformer to be tested. After clamping, the pins of the transformer to be tested are plugged into the plug on the upper end of the conversion board through the slots on the test board. Since the plug and the contacts at the bottom of the conversion board are connected through a circuit, when the pins of the transformer to be tested are connected to the plug on the upper end of the conversion board, they are connected to the contacts at the bottom of the conversion board, so that when the contacts at the bottom of the conversion board contact the probes on the fixed test fixture, the transformer to be tested can be connected to the fixed test fixture, so that the fixed test fixture can test the transformer to be tested without the need for the transformer to be tested to directly contact the probes, effectively reducing the probability of test errors caused by poor contact of the pins of the transformer to be tested.

[0011] The present invention is further configured as follows: each of the mobile test fixtures further comprises a mobile mounting seat for mounting the test board and the conversion board, and the mobile mounting seat is fixedly connected to the transfer platform.

[0012] By adopting the above technical scheme, the test plate and the conversion plate are fixedly connected to the transfer platform through the movable mounting seat, so that the test plate and the conversion plate can synchronously reach the test position of each test process with the transfer platform, so that the transformer to be tested can realize the test operation of different test processes, and the transformer to be tested does not need to be frequently moved and positioned in the process of reaching the test position of another test process from the test position of one test process, which not only has high test efficiency, but also has small test error and high test accuracy.

[0013] The present invention is further configured as follows: the test board is plugged into the mounting groove at the upper end of the mobile mounting seat, and the conversion plate is fixedly connected to the lower end of the mobile mounting seat.

[0014] By adopting the above technical solution, the test board is plugged into the mounting groove on the upper end of the mobile mounting seat, so that the test board is easy to disassemble and install. When the test board is damaged or needs to be matched with a different type of transformer to be tested, it can be immediately replaced and disassembled by plugging and unplugging, without the need to disassemble the fixture as a whole, with low maintenance cost, convenient operation and high operating efficiency.

[0015] The present invention is further configured as follows: it also includes positioning cylinders matching the number of fixed test fixtures, the positioning cylinders being fixedly connected to the fixture platform via a cylinder support platform, the telescopic axes of each positioning cylinder being respectively opposite to the test plates in the mobile test fixtures moved above the fixed test fixtures of each process to be tested.

[0016] By adopting the above technical solution, the positioning cylinder is used to position the test plate in the mobile test fixture that is moved above the fixed test fixture of the test process, so that during the continuous testing operation, the position of the test plate on each mobile test fixture is fixed, thereby effectively avoiding the occurrence of test errors caused by inaccurate positioning or movement of the test plate during the test.

[0017] The present invention is further configured as follows: the fixed test fixture includes a fixed test board, the probe is arranged at the upper end of the fixed test board, the number and position of the probe match the contact, and the bottom of the fixed test board is provided with an interface for connecting to different test cables, and each of the interfaces is connected to different probes through a test circuit on the fixed test board.

[0018] By adopting the above technical solution, when the mobile test fixture is connected to the fixed test fixture, the probes in the fixed test fixture and the contacts in the mobile test fixture correspond to each other and are in full contact. Since each interface is connected only to different probes through the test circuit on the fixed test board, the contacts in the mobile test fixture are connected only to the interfaces corresponding to the test process, thereby ensuring that the transformer to be tested can implement test operations of different test processes when the mobile test fixture structure is the same. Therefore, when the mobile test fixture of a single project is damaged, the test board on the mobile test fixture can be immediately plugged into the damaged project. The test can be carried out on the target fixture, and the number of mobile test fixtures can be increased or decreased according to the test efficiency. The installation position of the mobile test fixture on the transfer platform can also be arbitrarily combined front and back. It is only necessary to move the mobile test fixture until the contact at its bottom reaches the position above the fixed test fixture of the desired test process and contacts with the probe on the fixed test fixture. This ensures that the test stations in the equipment can be expanded infinitely. During the expansion process, there is no need to replace and debug the test fixture as a whole, which greatly saves the time for line change and gives full play to the efficiency of the automation equipment. It has a simple structure, strong versatility and convenient testing.

[0019] The present invention is further configured as follows: the lifting and adjusting mechanism comprises a lifting cylinder fixedly connected to the fixture platform, and the fixed test plate is connected to the telescopic shaft of the lifting cylinder via a fixed mounting seat.

[0020] By adopting the above technical solution, the telescopic shaft of the lifting cylinder drives the fixed mounting base connected to it to rise or fall when it is extended or retracted, and the fixed mounting base drives the fixed test plate to rise or fall when it rises or falls, so that the probe on the top of the fixed test plate contacts or separates with the contact at the bottom of the conversion plate in the mobile test fixture moved above it, with a simple structure and easy operation.

[0021] The present invention is further configured as follows: a loading robot is provided on one side of the jig platform, and a unloading robot is provided on the other side of the jig platform.

[0022] By adopting the above technical solution, the loading robot and the unloading robot are used to realize automatic loading and automatic unloading operations respectively, making the equipment more automated, thereby effectively reducing manual labor intensity and improving production efficiency.

[0023] A testing method using the above-mentioned separate testing device comprises the following steps:

[0024] S1: Use a loading robot to move the transformer to be tested to the fixture platform and insert the pins of the transformer to be tested into the slots of the test board in the mobile test fixture;

[0025] S2: Control the transfer platform to drive the mobile test fixture to circulate, so that the transformer to be tested moves synchronously with the mobile test fixture to combine with the fixed test fixture of each test process and complete the test operation of the corresponding test process;

[0026] S3: When the mobile test fixture reaches the top of the fixed test fixture of the first test process, the contacts at the bottom of the conversion plate in the mobile test fixture correspond one by one with the probes at the top of the fixed test plate in the fixed test fixture below it, and the transfer platform is controlled to lock at this time;

[0027] S4: Start the lifting cylinder in the lifting adjustment mechanism, and drive the fixed test plate to rise with the fixed mounting seat through the lifting cylinder, so that the probe on the top of the fixed test plate contacts the corresponding contacts on the conversion plate above it, thereby realizing the connection between the mobile test fixture and the fixed test fixture. After the connection, the first test process can be performed on the transformer to be tested on the mobile test fixture;

[0028] S5: After the first test process is completed, the lifting cylinder in the lifting adjustment mechanism is started in reverse, and the fixed test plate is driven by the lifting cylinder to descend to the initial position along with the fixed mounting seat. At this time, the probe on the fixed test plate is separated from the contact on the conversion plate above it;

[0029] S6: Repeat steps S2 to S4 to complete the other test processes following the first test process in sequence;

[0030] S7: When the last test process is completed, the unloading robot is used to remove the transformer on the mobile test fixture above the fixed test fixture of the last test process and put it into the corresponding receiving tray to realize the unloading operation.

[0031] The beneficial effects of the present invention are:

[0032] 1. The present invention realizes the test operation of different test procedures by moving the mobile test fixture in the separate test fixture with the transfer platform to move the transformer to the top of the station of the fixed test fixture corresponding to each test process and respectively combining with the fixed test fixture corresponding to each test process, that is, when the transformer to be tested is respectively moved to the top of the station of the fixed test fixture corresponding to each test process, the fixed test fixture corresponding to each test process is respectively driven by the lifting and adjusting mechanism to move upward, so that the probes on the top of the fixed test fixture corresponding to each test process are respectively connected with the contacts at the bottom of the mobile test fixture loaded with the transformer to be tested. Thereby, the test operations corresponding to each test process are completed respectively. The transformer to be tested always maintains good contact with the mobile test fixture during the process of moving with the mobile test fixture from one test process to another. There is no need to move and plug back and forth, which effectively avoids the situation in which traditional test equipment transfers the product from one test station to another, and the positioning error caused by the product moving back and forth and plugging causes the product sometimes not fully contacting the test circuit and causing a large number of misjudgments. At the same time, it also effectively avoids the situation in which the product is broken or damaged during multiple removal processes, which not only greatly improves the test accuracy, but also greatly reduces the loss of the product.

[0033] 2. The test board in the separate test fixture of the present invention is plugged into the mounting groove on the upper end of the movable mounting seat, so that the test board is easy to disassemble and install. When the test board is damaged or needs to be matched with a different type of transformer to be tested, it can be immediately replaced and disassembled by plugging and unplugging, without the need to disassemble the fixture as a whole, with low maintenance cost, convenient operation and high operating efficiency.

[0034] 3. When the present invention tests the transformer, when the mobile test fixture is connected to the fixed test fixture, the probes in the fixed test fixture and the contacts in the mobile test fixture correspond to each other and are in full contact. Since each interface is connected only to different probes through the test circuit on the fixed test board, the contacts in the mobile test fixture are connected only to the interfaces corresponding to the test process, thereby ensuring that the transformer to be tested can realize the test operations of different test processes when the mobile test fixture structure is the same, ensuring the unification of the test fixtures, avoiding the problem of high production cost caused by the original process of making different fixtures for various test stations, and when the mobile test fixture of a single project is damaged , the test board on the mobile test fixture can be immediately inserted into the fixture of the damaged item for testing. The number of mobile test fixtures can also be increased or decreased according to the test efficiency, and the installation position of the mobile test fixture on the transfer platform can be arbitrarily combined front and back. As long as the mobile test fixture is moved until the contact at the bottom reaches the position above the fixed test fixture of the test process to be tested and contacts with the probe on the fixed test fixture, the test stations in the equipment can be expanded infinitely. During the expansion process, there is no need to replace and debug the test fixture as a whole, which greatly saves the time for line change and gives full play to the efficiency of the automation equipment. It has a simple structure and strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 It is a schematic diagram of the overall structure of a separate testing device of the present invention.

[0037] Figure 2 It is a partial cross-sectional schematic diagram of a separate test fixture in a separate test device of the present invention.

[0038] In the figure, 1. fixture platform; 2. separate test fixture; 21. mobile test fixture; 211. contact; 212. test board; 213. conversion board; 214. slot; 215. plug; 216. mobile mounting seat; 217. mounting slot; 22. fixed test fixture; 221. probe; 222. fixed test board; 23. positioning cylinder; 24. cylinder support platform; 3. lifting adjustment mechanism; 31. lifting cylinder; 32. fixed mounting seat; 4. loading robot; 5. unloading robot; 6. transfer platform. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] like Figure 1 and Figure 2 As shown, a separate test device includes a fixture platform 1, on which are provided a plurality of separate test fixtures 2 respectively used for different test processes and a transfer platform 6 for driving each separate test fixture 2 to implement a corresponding test process on a transformer, wherein the transfer platform 6 may be, but is not limited to, a mechanism used by those skilled in the art such as a turntable and a conveyor belt, each of the separate test fixtures 2 includes a mobile test fixture 21 and a fixed test fixture 22, the mobile test fixture 21 is fixed on the transfer platform 6, the fixed test fixture 22 is fixed on the fixture platform 1 through a lifting and adjusting mechanism 3 and connected to a test cable on the fixture platform 1, and a contact 211 is provided at the bottom of the mobile test fixture 21 for connecting or disconnecting with a probe 221 at the top of the fixed test fixture 22.

[0041] Furthermore, each mobile test fixture 21 includes a test board 212 and a conversion board 213, the contact 211 is arranged at the bottom of the conversion board 213, and the test board 212 is provided with a slot 214 for plugging with the pin of the transformer, and the slot 214 is opposite to the plug 215 at the upper end of the conversion board 213, and the plug 215 is connected to the contact 211 at the bottom of the conversion board 213 through a circuit.

[0042] Furthermore, each of the mobile test fixtures 21 also includes a mobile mounting base 216 for mounting the test board 212 and the conversion board 213 , and the mobile mounting base 216 is fixedly connected to the transfer platform 6 .

[0043] Furthermore, the test board 212 is plugged into the mounting groove 217 at the upper end of the movable mounting seat 216 , and the conversion board 213 is fixedly connected to the lower end of the movable mounting seat 216 .

[0044] Furthermore, it also includes positioning cylinders 23 whose number matches the fixed test fixtures 22. The positioning cylinders 23 are fixedly connected to the fixture platform 1 through the cylinder support platform 24. The telescopic axes of the positioning cylinders 23 are respectively opposite to the test plates 212 in the mobile test fixture 21 moved above the fixed test fixture 22 of each process to be tested.

[0045] Furthermore, the fixed test fixture 22 includes a fixed test board 222, the probe 221 is arranged at the upper end of the fixed test board 222, the number and position of the probe 221 match the contact 211, and the bottom of the fixed test board 222 is provided with an interface for connecting to different test cables, and each of the interfaces is connected to different probes 221 through the test circuit on the fixed test board 222.

[0046] Furthermore, the lifting and adjusting mechanism 3 includes a lifting cylinder 31 fixedly connected to the fixture platform 1 , and the fixed test plate 222 is connected to the telescopic shaft of the lifting cylinder 31 via a fixed mounting seat 32 .

[0047] Furthermore, a loading robot 4 is provided on one side of the jig platform 1 , and a unloading robot 5 is provided on the other side of the jig platform 1 .

[0048] A testing method using the above-mentioned separate testing device comprises the following steps:

[0049] S1: Use the loading robot 4 to move the transformer to be tested to the fixture platform 1 and insert the pins of the transformer to be tested into the slots 214 of the test board 212 in the mobile test fixture 21;

[0050] S2: Control the transfer platform 6 to drive the mobile test fixture 21 to circulate, so that the transformer to be tested moves synchronously with the mobile test fixture 21 to combine with the fixed test fixture 22 of each test process and complete the test operation of the corresponding test process;

[0051] S3: When the mobile test fixture 21 reaches the top of the fixed test fixture 22 of the first test process, the contact 211 at the bottom of the conversion plate 213 in the mobile test fixture 21 corresponds to the probe 221 at the top of the fixed test plate 222 in the fixed test fixture 22 below it, and the transfer platform 6 is controlled to lock;

[0052] S4: Start the lifting cylinder 31 in the lifting adjustment mechanism 3, and drive the fixed test plate 222 to rise with the fixed mounting seat through the lifting cylinder 31, so that the probe 221 on the top of the fixed test plate 222 contacts the corresponding contact 211 on the conversion plate 213 above it, thereby realizing the connection between the mobile test fixture 21 and the fixed test fixture 22. After the connection, the first test process can be performed on the transformer to be tested on the mobile test fixture 21;

[0053] S5: After the first test process is completed, the lifting cylinder 31 in the lifting adjustment mechanism 3 is reversely started, and the fixed test plate 222 is driven by the lifting cylinder 31 to descend to the initial position along with the fixed mounting seat. At this time, the probe 221 on the fixed test plate 222 is separated from the contact 211 on the conversion plate 213 above it;

[0054] S6: Repeat steps S2 to S4 to complete the other test processes following the first test process in sequence;

[0055] S7: After the last test process is completed, the unloading robot 5 is used to remove the transformer on the mobile test fixture 21 above the fixed test fixture 22 of the last test process and put it into the corresponding receiving tray 7 to implement the unloading operation.

Claims

1. A separate testing device, comprising a fixture platform (1), characterized in that: The fixture platform (1) is provided with a plurality of separate test fixtures (2) respectively used for different test processes and a transfer platform (6) used to drive each separate test fixture (2) to implement a corresponding test process on the transformer. Each separate test fixture (2) comprises a mobile test fixture (21) and a fixed test fixture (22). The mobile test fixture (21) is fixed on the transfer platform (6). The fixed test fixture (22) is fixed on the fixture platform (1) through a lifting and adjusting mechanism (3) and connected to a test cable on the fixture platform (1). The bottom of the mobile test fixture (21) is provided with a contact (211) used to connect or disconnect with a probe (221) on the top of the fixed test fixture (22).

2. A separate testing device according to claim 1, characterized in that: Each mobile test fixture (21) comprises a test board (212) and a conversion board (213), wherein the contact (211) is arranged at the bottom of the conversion board (213), and the test board (212) is provided with a slot (214) for plugging with the pins of the transformer, wherein the slot (214) is opposite to a plug (215) at the upper end of the conversion board (213), and the plug (215) is connected to the contact (211) at the bottom of the conversion board (213) via a circuit.

3. A separate testing device according to claim 2, characterized in that: Each of the mobile test fixtures (21) further comprises a mobile mounting seat (216) for mounting the test board (212) and the conversion board (213), and the mobile mounting seat (216) is fixedly connected to the transfer platform (6).

4. A separate testing device according to claim 3, characterized in that: The test board (212) is plugged into a mounting groove (217) at the upper end of the movable mounting seat (216), and the conversion board (213) is fixedly connected to the lower end of the movable mounting seat (216).

5. A separate testing device according to claim 4, characterized in that: It also includes positioning cylinders (23) whose number matches the number of fixed test jigs (22), wherein the positioning cylinders (23) are fixedly connected to the jig platform (1) via a cylinder support platform (24), and the telescopic axes of each positioning cylinder (23) are respectively opposite to the test plates (212) in the mobile test jig (21) moved above the fixed test jig (22) of each process to be tested.

6. A separate testing device according to any one of claims 1 to 5, characterized in that: The fixed test fixture (22) comprises a fixed test board (222), the probes (221) are arranged at the upper end of the fixed test board (222), the number and position of the probes (221) match those of the contacts (211), and the bottom of the fixed test board (222) is provided with interfaces for connecting to different test cables, and each of the interfaces is connected to different probes (221) through a test circuit on the fixed test board (222).

7. A separate testing device according to claim 6, characterized in that: The lifting and adjusting mechanism (3) comprises a lifting cylinder (31) fixedly connected to the fixture platform (1), and the fixed test plate (222) is connected to the telescopic shaft of the lifting cylinder (31) via a fixed mounting seat (32).

8. A separate testing device according to claim 7, characterized in that: A loading robot (4) is provided on one side of the jig platform (1), and a unloading robot (5) is provided on the other side of the jig platform (1).

9. A testing method using the above-mentioned separate testing device, characterized in that: The following steps are involved: S1: using a loading robot (4) to transfer the transformer to be tested to the fixture platform (1) and inserting the pins of the transformer to be tested into the slots (214) of the test board (212) in the mobile test fixture (21); S2: Controlling the transfer platform (6) to drive the mobile test fixture (21) to cyclically move, so that the transformer to be tested moves synchronously with the mobile test fixture (21) to be combined with the fixed test fixture (22) of each test process and completes the test operation of the corresponding test process; S3: When the mobile test fixture (21) reaches directly above the fixed test fixture (22) of the first test process, the contact (211) at the bottom of the conversion plate (213) in the mobile test fixture (21) corresponds one-to-one with the probe (221) at the top of the fixed test plate (222) in the fixed test fixture (22) below it, and the transfer platform (6) is controlled to lock at this time; S4: starting the lifting cylinder (31) in the lifting adjustment mechanism (3), and driving the fixed test plate (222) to rise with the fixed mounting seat through the lifting cylinder (31) to the point where the probe (221) on the top thereof contacts the corresponding contact (211) on the conversion plate (213) above it, thereby achieving the connection between the mobile test fixture (21) and the fixed test fixture (22). After the connection, the first test process can be performed on the transformer to be tested on the mobile test fixture (21); S5: After the first test process is completed, the lifting cylinder (31) in the lifting adjustment mechanism (3) is started in reverse, and the fixed test plate (222) is driven by the lifting cylinder (31) to descend to the initial position along with the fixed mounting seat, and at this time, the probe (221) on the fixed test plate (222) is separated from the contact (211) on the conversion plate (213) above it; S6: Repeat steps S2 to S4 to complete the other test processes following the first test process in sequence; S7: When the last test process is completed, the unloading robot (5) is used to remove the transformer on the mobile test fixture (21) above the fixed test fixture (22) of the last test process and place it in the corresponding receiving tray (7) to implement the unloading operation.

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