Calibration device for combined mutual inductor
By designing a combined transformer verification device including lifting plate and dustproof door, the problems of dust accumulation and external damage are solved, and higher detection accuracy and service life are achieved.
Patent Information
- Application Number
- CN202422153819.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-09-03
AI Technical Summary
The existing combined transformer verification device is prone to accumulation of dust after use, affecting the accuracy of the detection results, and is susceptible to damage to external forces, shortening its service life.
A verification device including a workbench, control panel, lifting plate and dustproof door is designed. The internal storage of transformers and other equipment is realized through lifting components and switching mechanisms. The dustproof door reduces the possibility of dust accumulation and external force damage when closed, and opens for verification when needed.
It improves the accuracy of the test results, extends the service life of the equipment, and reduces the possibility of economic losses.
Smart Images
Figure CN223092125U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of calibration devices, and in particular to a calibration device for a combined transformer. Background Art
[0002] A combined transformer is a special transformer, also known as an instrument transformer, which is a general term for current transformers and voltage transformers. It converts the high voltage or large current in the primary circuit into a low voltage (usually 100V) or additional secondary current (usually 5A or 1A) in the secondary circuit. This conversion enables devices such as secondary instruments and protection relays to be effectively isolated from high-voltage devices, thus ensuring the safety of operators.
[0003] During the production process of transformers, calibration devices are required to calibrate the operating parameters of the transformers. When the calibration devices are not in use, they are usually placed on the workbench in an external manner. This not only easily accumulates a large amount of dust, affecting the accuracy of the detection results, but also is easily damaged by external forces, thus affecting the service life and causing economic losses. Summary of the Utility Model
[0004] In order to improve the accuracy of detection results and service life, this application provides a calibration device for a combined transformer.
[0005] The calibration device for a combined transformer provided by this application adopts the following technical solutions:
[0006] A calibration device for a combined transformer includes a workbench and a control panel. The control panel is installed on the workbench. A storage cavity is opened in the workbench. A lifting plate slides in the storage cavity. A transformer, an ammeter, a voltmeter, and a transformer are installed on the lifting plate. A lifting assembly for controlling the lifting of the lifting plate is arranged in the storage cavity. Sliding grooves are opened on the opposite inner walls of the storage cavity. Dust-proof doors slide in the sliding grooves. Two groups of switching mechanisms for driving the opening and closing of the dust-proof doors are arranged in the workbench.
[0007] By adopting the above technical solution, the connection points of the current transformer, ammeter, transformer, and voltmeter are first connected correspondingly using special connecting wires. Before calibration, the lifting plate with devices such as the current transformer installed thereon is in the storage cavity inside the workbench, and the dust-proof door at the top of the storage cavity is in a closed state. This not only reduces the possibility of the equipment being damaged by external forces but also reduces the accumulation of dust on the workbench, which affects the accuracy of the detection results, further affects the service life, and causes economic losses. When preparing for calibration, the staff adjusts the height of the lifting plate through the lifting component. At the same time, the dust-proof door on the workbench is opened under the action of the switching mechanism. The lifting plate drives the equipment such as the current transformer thereon to move to the surface of the workbench. Then, the calibration device is connected to an external power source through the corresponding buttons on the control panel, and the voltage in the calibration device is adjusted through the transformer. Then, the relevant parameters of the current transformer can be calibrated and displayed through the ammeter and voltmeter.
[0008] Preferably, the lifting component includes a motor and a lead screw. An installation groove is formed in the workbench. The motor is installed in the installation groove. The lead screw is fixedly connected to the rotating shaft of the motor. The lead screw passes through the installation groove and rotates in the storage cavity. The lifting plate is threadedly connected to the lead screw. The control panel controls the state of the motor.
[0009] By adopting the above technical solution, when the staff needs to calibrate, the staff starts the motor to rotate through the corresponding button on the control panel. The rotation of the motor drives the rotation of the lead screw, and the rotation of the lead screw drives the movement of the lifting plate.
[0010] Preferably, insertion blocks and slots for inserting the insertion blocks are respectively fixedly connected to the opposite side walls of the two dust-proof doors.
[0011] By adopting the above technical solution, when the two dust-proof doors move relative to each other and abut, the insertion blocks are inserted into the slots, thereby preventing dust from entering the storage cavity through the gap between the two dust-proof doors and further improving the dust-proof effect.
[0012] Preferably, the switching mechanism includes two first racks, two first gears, a first worm, and a first worm gear. The two first racks are respectively fixedly connected to both ends of the dust-proof door. A placement groove is formed in the workbench. A first rotating rod is rotatably arranged in the placement groove. The two first gears are fixedly sleeved at both ends of the first rotating rod. The two first gears are meshed with the two first racks. The first worm gear is fixedly sleeved on the first rotating rod. The first worm is meshed with the first worm gear. A switching component for driving the first worm to rotate is further arranged on the workbench.
[0013] By adopting the above technical solution, driven by the switch assembly, the first worm rotates, the rotation of the first worm drives the rotation of the first worm gear, the first worm gear drives the rotation of the first rotating rod, the rotation of the first rotating rod drives the rotation of the first gears at both ends thereof, and the rotation of the first gears drives the movement of the first rack, thereby driving the movement of the dust-proof door.
[0014] Preferably, the switch assembly includes a second gear, a second rack, a second worm, and a second worm gear. A driving groove is formed in the inner wall of the storage cavity. The second rack slides in the driving groove. A second rotating rod is rotatably arranged in the driving groove. One end of the second rotating rod is fixedly sleeved with the second gear and meshes with the second rack. The second worm gear is fixedly sleeved at the end of the second rotating rod away from the second gear. The second worm is fixedly connected to the first worm, and the second worm meshes with the second worm gear. The lifting plate is fixedly connected to the second rack. A limiting component for limiting the second gear is arranged in the driving groove.
[0015] By adopting the above technical solution, before the lifting plate moves, the second gear is fixed under the action of the limiting component. When the lifting plate moves upward, the limiting effect on the second gear is released. The movement of the lifting plate drives the movement of the second rack, the movement of the second rack drives the rotation of the second gear, the rotation of the second gear drives the rotation of the second rotating rod, the rotation of the second rotating rod drives the rotation of the second worm gear, and the rotation of the second worm gear drives the rotation of the second worm, thereby driving the rotation of the first worm and opening the dust-proof door.
[0016] Preferably, load-bearing grooves are formed in the opposite inner walls of the storage cavity. The load-bearing grooves communicate with the sliding grooves. A load-bearing rod is fixedly connected to the side wall of the dust-proof door. The load-bearing rod is slidably connected to the inner wall of the load-bearing groove.
[0017] By adopting the above technical solution, when the dust-proof door is closed, the load-bearing rod slides in the load-bearing groove, increasing the support for the dust-proof door, thereby increasing the stability of the dust-proof door.
[0018] Preferably, fixing grooves are formed in the opposite side walls of the lifting plate. Fixing blocks slide in the fixing grooves. A first spring is arranged in the fixing grooves. Two ends of the first spring are respectively fixedly connected to the fixing block and the inner wall of the fixing groove. Insertion grooves for inserting the fixing grooves are formed in the inner wall of the storage cavity; a first inclined surface is arranged on the fixing block. A push rod is inserted into the lifting plate. The push rod abuts against the first inclined surface. One end of the push rod away from the first inclined surface is fixedly connected to a push block.
[0019] By adopting the above technical solution, during the movement of the lifting plate, the fixed block is slidably connected to the inner wall of the storage cavity. When the lifting plate moves to the maximum range, the fixed block aligns with the fixing groove, and under the push of the first spring, the fixed block is inserted into the fixing groove to fix the lifting plate, increasing the stability of the lifting plate when the staff conducts calibration operations. When the staff has completed the calibration and needs to move the lifting plate into the storage cavity, the staff first moves the push block downward. The movement of the push block pushes the push rod downward. The push rod abuts against the first inclined surface to push the fixed block to compress the first spring and move, so that the fixed block moves away from the fixing groove.
[0020] Preferably, the limiting component includes a limiting block and a second spring. A limiting groove is formed in the inner wall of the driving groove. The limiting block slides in the limiting groove. Two ends of the second spring are respectively fixedly connected to the limiting block and the limiting groove. The limiting block is inserted into the tooth groove of the second gear. A second inclined surface is arranged on the limiting block. A blocking plate is fixedly connected to the second rack. The blocking plate abuts against the second inclined surface.
[0021] By adopting the above technical solution, when the lifting plate is in the storage cavity and abuts against the inner wall of the storage cavity, the limiting block is inserted into the tooth groove of the second gear under the push of the second spring, reducing the possibility of the second gear rotating, and further reducing the possibility of the dust-proof door opening. When the lifting plate moves upward, it drives the second rack to move. The movement of the second rack drives the blocking plate thereon to move. The blocking plate abuts against the second inclined surface and pushes the limiting block to compress the second spring and move. When the dust-proof door is completely opened and the second rack moves away from the second gear, the limiting block is inserted into the tooth groove of the second gear under the elastic force of the second spring, thus fixing the second gear and maintaining the opened state of the dust-proof door.
[0022] In summary, the present application includes at least one of the following beneficial technical effects:
[0023] 1. First, the respective connection points of the mutual inductor, ammeter, transformer, and voltmeter are connected correspondingly using special connecting wires. Before calibration, the lifting plate with the devices such as the mutual inductor installed thereon is in the storage cavity inside the workbench, and the dust-proof door at the top of the storage cavity is in the closed state, which not only reduces the possibility of the equipment being damaged due to external forces, but also reduces the accumulation of dust on the workbench, affecting the accuracy of the detection results, and further affecting the service life and causing economic losses. When preparing for calibration, the staff adjusts the height of the lifting plate through the lifting component. At the same time, the dust-proof door on the workbench is opened under the action of the switching mechanism. The lifting plate drives the devices such as the mutual inductor thereon to move to the surface of the workbench. Then, the calibration device is connected to an external power source through the corresponding buttons on the control panel, and the voltage in the calibration device is adjusted through the transformer. Then, the relevant parameters of the mutual inductor can be calibrated and displayed through the ammeter and voltmeter;
[0024] 2. When the two dust-proof doors move relative to each other and abut, the insertion block is inserted into the insertion slot, thereby preventing dust from entering the storage cavity through the gap between the two dust-proof doors and further improving the dust-proof effect;
[0025] 3. When the dust-proof door is closed, the load-bearing rod slides in the load-bearing groove, increasing the support for the dust-proof door and thus enhancing the stability of the dust-proof door. Description of the Drawings
[0026] Figure 1 is a schematic diagram of the overall structure of a calibration device for a combined mutual inductor.
[0027] Figure 2 is a front sectional view of a calibration device for a combined mutual inductor.
[0028] Figure 3 is a side sectional view of a calibration device for a combined mutual inductor.
[0029] Description of the Reference Numerals:
[0030] 1, workbench; 2, control panel; 3, storage cavity; 4, lifting plate; 5, transformer; 6, ammeter; 7, voltmeter; 8, mutual inductor; 9, lifting assembly; 10, chute; 11, dust-proof door; 12, switching mechanism; 13, motor; 14, lead screw; 15, installation groove; 16, insertion slot; 17, insertion block; 18, first rack; 19, first gear; 20, first worm; 21, first worm gear; 22, placement groove; 23, first rotating rod; 24, switching assembly; 25, second gear; 26, second rack; 27, second worm; 28, second worm gear; 29, driving groove; 30, second rotating rod; 31, limiting assembly; 32, load-bearing groove; 33, load-bearing rod; 34, fixing groove; 35, fixing block; 36, first spring; 37, insertion slot; 38, push rod; 39, first inclined surface; 40, second inclined surface; 41, limiting block; 42, second spring; 43, blocking plate; 44, pushing block. Detailed Embodiments
[0031] The following further elaborates on this application in conjunction with the attached Figures 1-3 drawings.
[0032] An embodiment of this application discloses a calibration device for a combined mutual inductor 8, as shown in Figure 1 and Figure 2As shown in the figure, it includes a workbench 1 and a control panel 2. The control panel 2 is installed on the workbench 1. A storage cavity 3 is formed inside the workbench 1. A lifting plate 4 slides vertically inside the storage cavity 3. The lifting plate 4 is cuboid-shaped. A transformer 5, an ammeter 6, a voltmeter 7, and a mutual inductor 8 are fixedly installed on the upper end surface of the lifting plate 4. Each connection point of the mutual inductor 8, ammeter 6, transformer 5, and voltmeter 7 is connected correspondingly using special connecting wires. A lifting assembly 9 for controlling the lifting of the lifting plate 4 is arranged inside the storage cavity 3. Opposite inner walls at the top of the storage cavity 3 are each provided with a sliding groove 10 in the horizontal direction. A dust-proof door 11 slides in each of the two sliding grooves 10. The dust-proof door 11 is cuboid-shaped. On one of the opposite side walls of the two dust-proof doors 11, a plug 17 is fixedly welded, and on the other, a slot 16 for the plug 17 to be inserted is provided. Two switch mechanisms 12 for driving the opening and closing of the dust-proof doors 11 are arranged inside the workbench 1. The two switch mechanisms 12 respectively control the opening and closing of the two dust-proof doors 11. When sealing the storage cavity, the switch mechanisms 12 drive the two dust-proof doors 11 to move relative to each other until the plug 17 is inserted into the slot 16, and the two dust-proof doors 11 abut and close. The dust-proof doors 11 reduce the possibility of dust entering the storage cavity 3, and the cooperation of the plug 17 and the slot 16 prevents dust from entering the storage cavity 3 through the gap between the two dust-proof doors 11, further improving the dust-proof effect.
[0033] As Figure 2 and Figure 3 shown in the figure, load-bearing grooves 32 are provided on the opposite inner walls of the sliding groove 10. The load-bearing grooves 32 communicate with the sliding grooves 10 on both sides of the storage cavity 3. A load-bearing rod 33 is fixedly welded on the side wall of the dust-proof door 11. The load-bearing rod 33 is slidably connected to the inner wall of the load-bearing groove 32. When the dust-proof door 11 is closed, the load-bearing rod 33 slides in the load-bearing groove 32, increasing the support for the dust-proof door 11, thereby increasing the stability of the dust-proof door 11.
[0034] As Figure 2As shown, the lifting assembly 9 includes a motor 13 and a lead screw 14. An installation groove 15 is formed in the workbench 1. The motor 13 is fixedly installed in the installation groove 15. The bottom end of the lead screw 14 is fixedly welded to the rotating shaft of the motor 13. The lead screw 14 passes through the inner wall of the installation groove 15 and rotates in the storage cavity 3. The lifting plate 4 is threadedly connected to the lead screw 14. The control panel 2 controls the state of the motor 13. When the lifting plate 4 is in the storage cavity 3, its bottom end abuts against the bottom inner wall of the storage cavity 3, bearing the weight of the lifting plate 4 and reducing the possibility of the lifting plate 4 shaking during the movement of the workbench 1. Fixed grooves 34 are formed in the opposite side walls of the lifting plate 4 along the horizontal direction. Fixed blocks 35 slide horizontally in the fixed grooves 34. A first spring 36 is arranged horizontally in the fixed grooves 34. The two ends of the first spring 36 are respectively fixedly welded to the fixed block 35 and the opposite side walls of the fixed grooves 34. A plugging groove 37 for plugging the fixed groove 34 is formed in the top inner wall of the storage cavity 3. A first inclined surface 39 is arranged on the fixed block 35. A push rod 38 is inserted vertically into the upper end surface of the lifting plate 4. The bottom end of the push rod 38 abuts against the first inclined surface 39. The top end of the push rod 38 is fixedly welded with a push block 44.
[0035] As Figure 1 and Figure 2 shown, before calibration, the lifting plate 4 with devices such as current transformers 8 installed thereon is in the storage cavity 3 inside the workbench 1 and abuts against the bottom inner wall of the storage cavity 3. The dust-proof door 11 at the top of the storage cavity 3 is in the closed state, which can not only reduce the possibility of the equipment being damaged by external forces, but also reduce the accumulation of dust on the workbench 1, affecting the accuracy of the detection results, and further affecting the service life and causing economic losses. When preparing for calibration, the staff starts the motor 13 to rotate through the corresponding button on the control panel 2. The rotation of the motor 13 drives the lead screw 14 to rotate. The rotation of the lead screw 14 drives the lifting plate 4 to move. At the same time, the dust-proof door 11 on the workbench 1 is opened under the action of the switching mechanism 12.
[0036] As Figure 2As shown, during the movement of the lifting plate 4, the fixed block 35 is slidably connected to the inner wall of the storage cavity 3. When the lifting plate 4 moves to the top of the storage cavity 3 and the fixed block 35 aligns with the fixing groove 34, the fixed block 35 is inserted into the fixing groove 34 under the push of the first spring 36 to fix the lifting plate 4 and increase the stability of the lifting plate 4. At this time, the lifting plate 4 moves the equipment such as the mutual inductor 8 thereon to the surface of the workbench 1, and then the calibration device is connected to an external power supply through the corresponding button on the control panel 2, and the voltage in the calibration device is adjusted through the transformer 5. Then, the relevant parameters of the mutual inductor 8 can be calibrated and displayed through the ammeter 6 and the voltmeter 7. When the staff has completed the calibration and needs to move the lifting plate 4 into the storage cavity 3, the staff first moves downward through the push block 44, and the push block 44 pushes the push rod 38 downward. The push rod 38 abuts against the first inclined surface 39 to push the fixed block 35 to compress the first spring 36 and move, so that the fixed block 35 moves away from the fixing groove 34.
[0037] As Figure 2 and Figure 3 shown, the switch mechanism 12 includes two first racks 18, two first gears 19, a first worm 20 and a first worm wheel 21. The two first racks 18 are respectively fixedly welded to both ends of the lower end surface of the dust-proof door 11. A placement groove 22 is formed in the workbench 1, and a first rotating rod 23 is rotatably arranged in the placement groove 22. The two first gears 19 are respectively fixedly sleeved on both ends of the first rotating rod 23, and the two first gears 19 and the two first racks 18 are respectively meshed with each other in a one-to-one correspondence. The first worm wheel 21 is fixedly sleeved on the middle of the first rotating rod 23. The first worm 20 is arranged in the vertical direction and meshes with the first worm wheel 21. A switch assembly 24 for driving the first worm 20 to rotate is further arranged on the workbench 1.
[0038] As Figure 2 and Figure 3As shown in the figure, the switch assembly 24 includes a second gear 25, a second rack 26, a second worm 27, and a second worm gear 28. Driving grooves 29 are formed on the inner walls of both sides of the storage cavity 3. The second rack 26 slides vertically in the driving groove 29. One side of the second rack 26 is fixedly welded to the side wall of the lifting plate 4. A second rotating rod 30 is horizontally rotatably arranged in the driving groove 29. The second gear 25 is fixedly sleeved at one end of the second rotating rod 30 and meshes with the second rack 26. The second worm gear 28 is fixedly sleeved at the end of the second rotating rod 30 away from the second gear 25. The second worm 27 rotates vertically and is fixedly welded to the first worm 20. The end of the second worm 27 away from the first worm 20 meshes with the second worm gear 28. A limiting component 31 for limiting the second gear 25 is arranged in the driving groove 29. The limiting component 31 includes a limiting block 41 and a second spring 42. A limiting groove is formed on the inner wall of the driving groove 29. The limiting block 41 slides horizontally in the limiting groove. The second spring 42 is horizontally arranged in the limiting groove. The two ends of the second spring 42 are respectively fixedly welded to the limiting block 41 and the inner wall of the limiting groove. Second inclined surfaces 40 are arranged on the opposite side walls of the end of the limiting block 41 away from the second spring 42. The limiting block 41 is inserted into the tooth groove of the second gear 25. A partition plate 43 is fixedly welded on the side wall of the second rack 26. The partition plate 43 abuts against the second inclined surface 40.
[0039] As Figure 2 and Figure 3 shown in the figure, when the lifting plate 4 is in the storage cavity 3 and abuts against the inner wall of the storage cavity 3, the limiting block 41 is inserted into the tooth groove of the second gear 25 under the push of the second spring 42, reducing the possibility of the second gear 25 rotating, and further reducing the possibility of the dust-proof door 11 being opened. When the lifting plate 4 moves upward driven by the motor 13, it drives the second rack 26 to move upward. The movement of the second rack 26 drives the partition plate 43 thereon to move upward. The partition plate 43 abuts against the second inclined surface 40 and pushes the limiting block 41 to compress the second spring 42 and move, so that the limiting block 41 is away from the second gear 25 and the partition plate 43 is located between the second gear 25 and the limiting block 41, thereby reducing the influence of the limiting block 41 on the rotation of the second gear 25. The movement of the second rack 26 drives the second gear 25 to rotate. The rotation of the second gear 25 drives the second rotating rod 30 to rotate. The rotation of the second rotating rod 30 drives the second worm gear 28 to rotate. The rotation of the second worm gear 28 drives the second worm 27 to rotate. The rotation of the second worm 27 drives the first worm 20 to rotate. The rotation of the first worm 20 drives the first worm gear 21 to rotate. The first worm gear 21 drives the first rotating rod 23 to rotate. The first rotation drives the first gears 19 at both ends thereof to rotate. The rotation of the first gears 19 drives the first rack 18 to move, thereby driving the dust-proof door 11 to move and further opening the dust-proof door 11.
[0040] As Figure 2 and Figure 3As shown, when the dust-proof door 11 is fully opened and the second rack 26 moves away from the second gear 25, the baffle 43 also moves away from the second gear 25 accordingly. The limiting block 41 is inserted into the tooth groove of the second gear 25 under the elastic force of the second spring 42, thereby fixing the second gear 25 and maintaining the dust-proof door 11 in the open state.
[0041] The implementation principle of the embodiment of the present application is as follows: First, the respective connection points of the mutual inductor 8, ammeter 6, transformer 5, and voltmeter 7 are connected correspondingly using special connecting wires. Before calibration, the lifting plate 4 with the devices such as the mutual inductor 8 installed thereon is in the storage cavity 3 inside the workbench 1, and the dust-proof door 11 at the top of the storage cavity 3 is in the closed state, which not only reduces the possibility of the equipment being damaged by external forces but also can reduce the accumulation of dust on the workbench 1, affecting the accuracy of the detection results, further affecting the service life, and causing economic losses. When preparing for calibration, the staff adjusts the height of the lifting plate 4 through the lifting assembly 9. At the same time, the dust-proof door 11 on the workbench 1 is opened under the action of the switching mechanism 12. The lifting plate 4 moves the devices such as the mutual inductor 8 thereon to the surface of the workbench 1. Then, the calibration device is connected to an external power supply through the corresponding buttons on the control panel 2, and the voltage in the calibration device is adjusted through the transformer 5. Then, the relevant parameters of the mutual inductor 8 can be calibrated and displayed through the ammeter 6 and voltmeter 7.
[0042] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited hereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.
Claims
1. A calibration device for a combined instrument transformer (8), characterized in that: It includes a workbench (1) and a control panel (2). The control panel (2) is installed on the workbench (1). A storage cavity (3) is formed inside the workbench (1). A lifting plate (4) is slidably arranged inside the storage cavity (3). A transformer (5), an ammeter (6), a voltmeter (7) and a mutual inductor (8) are installed on the lifting plate (4). A lifting component (9) for controlling the lifting of the lifting plate (4) is arranged inside the storage cavity (3). Slide grooves (10) are formed in the opposite inner walls of the storage cavity (3). A dust-proof door (11) is slidably arranged inside the slide grooves (10). Two switch mechanisms (12) for driving the opening and closing of the dust-proof door (11) are arranged inside the workbench (1).
2. The calibration device for a combined current and voltage transformer (8) according to claim 1, characterized in that: The lifting component (9) includes a motor (13) and a lead screw (14). An installation groove (15) is formed inside the workbench (1). The motor (13) is installed in the installation groove (15). The lead screw (14) is fixedly connected to the rotating shaft of the motor (13). The lead screw (14) passes through the installation groove and rotates inside the storage cavity (3). The lifting plate (4) is threadedly connected to the lead screw (14). The control panel (2) controls the state of the motor (13).
3. A calibration device for a combined mutual inductor (8) according to claim 1, characterized in that: Insert blocks (17) are respectively and fixedly connected to the opposite side walls of the two dust-proof doors (11), and slots (16) for inserting the insert blocks (17) are provided.
4. A calibration device for a combined mutual inductor (8) according to claim 1, characterized in that: The switch mechanism (12) includes two first racks (18), two first gears (19), a first worm (20) and a first worm wheel (21). The two first racks (18) are respectively and fixedly connected to the two ends of the dust-proof door (11). A placement groove (22) is formed inside the workbench (1). A first rotating rod (23) is rotatably arranged inside the placement groove (22). The two first gears (19) are fixedly sleeved at the two ends of the first rotating rod (23). The two first gears (19) are meshed with the two first racks (18). The first worm wheel (21) is fixedly sleeved on the first rotating rod (23). The first worm (20) is meshed with the first worm wheel (21). A switch component (24) for driving the rotation of the first worm (20) is further arranged on the workbench (1).
5. A calibration device for a combined transformer (8) according to claim 4, characterized in that: The switch assembly (24) includes a second gear (25), a second rack (26), a second worm (27), and a second worm gear (28). A driving groove (29) is formed in the inner wall of the storage cavity (3). The second rack (26) slides in the driving groove (29). A second rotating rod (30) is rotatably arranged in the driving groove (29). One end of the second rotating rod (30) is fixedly sleeved with the second gear (25) which meshes with the second rack (26). The second worm gear (28) is fixedly sleeved on the end of the second rotating rod (30) away from the second gear (25). The second worm (27) is fixedly connected to the first worm (20) and meshes with the second worm gear (28). The lifting plate (4) is fixedly connected to the second rack (26). A limiting component (31) for limiting the second gear (25) is arranged in the driving groove (29).
6. The calibration device for a combined instrument transformer (8) according to claim 1, characterized in that: Load-bearing grooves (32) are formed in the opposite inner walls of the storage cavity (3). The load-bearing grooves (32) communicate with the sliding grooves (10). A load-bearing rod (33) is fixedly connected to the side wall of the dust-proof door (11). The load-bearing rod (33) is slidably connected to the inner wall of the load-bearing groove (32).
7. A calibration device for a combined mutual inductor (8) according to claim 1, characterized in that: Fixing grooves (34) are formed in the opposite side walls of the lifting plate (4). Fixing blocks (35) slide in the fixing grooves (34). A first spring (36) is arranged in the fixing grooves (34). Two ends of the first spring (36) are respectively fixedly connected to the fixing block (35) and the inner wall of the fixing groove (34). Insertion grooves (37) for inserting the fixing grooves (34) are formed in the inner wall of the storage cavity (3). A first inclined surface (39) is arranged on the fixing block (35). A push rod (38) is inserted into the lifting plate (4). The push rod (38) abuts against the first inclined surface (39). One end of the push rod (38) away from the first inclined surface (39) is fixedly connected to a push block (44).
8. A calibration device for a combined transformer (8) according to claim 5, characterized in that: The limiting component (31) includes a limiting block (41) and a second spring (42). A limiting groove is formed in the inner wall of the driving groove (29). The limiting block (41) slides in the limiting groove. Two ends of the second spring (42) are respectively fixedly connected to the limiting block (41) and the limiting groove. The limiting block (41) is inserted into the tooth groove of the second gear (25). A second inclined surface (40) is arranged on the limiting block (41). A blocking plate (43) is fixedly connected to the second rack (26). The blocking plate (43) abuts against the second inclined surface (40).