On-load tap-changer detection device and detection method thereof

Abstract

The invention discloses an on-load tap-changer detection device and a detection method thereof, and belongs to the technical field of on-load tap-changer detection. The device comprises a conveying mechanism, a controller, a gantry supporting frame and a detection mechanism, the detection mechanism comprises a rotary lifting unit and a detection unit, the rotary lifting unit comprises a ball spline arranged on a mounting plate, the ball spline is connected with a rotary driving motor through a belt, and the ball spline is connected with a lifting assembly. The bottom end of the ball spline is provided with at least one installation arm used for installing a detection unit, and the installation plate is connected to the gantry supporting frame. Meanwhile, the invention discloses a detection method based on the device. By adopting the on-load tap-changer detection device and the detection method thereof, the fixing and positioning of the cylindrical switch seat are realized, the detection unit is carried by the rotary lifting unit to detect the static contact, the detection precision and efficiency are improved, and meanwhile, the detection of the extension length, width, diameter and flatness can be carried out.

Description

Technical Field

[0001] The present invention relates to the technical field of on-load tap changer detection, and in particular to an on-load tap changer detection device and a detection method thereof. Background Art

[0002] On-Load Tap Changer (OLTC) is a device used on high-voltage transformers in power systems. It can adjust the voltage ratio of the transformer without shutting down the transformer, thereby regulating the output voltage and ensuring the stability of the grid voltage.

[0003] During the production process, it is necessary to detect the protruding distance of multiple static contacts on the switch seat to ensure the contact reliability of the moving contact and the static contact of the vacuum on-load tap changer. The prior art only has a detection device for the meshing depth of the moving contact and the static contact in the switch cabinet. For example, the patent with announcement number CN212567236U discloses a measuring device for measuring the meshing depth of the static contact and the moving contact. Each static contact position in the switch cabinet has a detection unit for measuring the meshing depth of each moving contact and the static contact. However, for the vacuum on-load tap changer, the switch seat is cylindrical and there are many static contacts. The existing detection unit cannot complete the detection of the vacuum on-load tap changer. The prior art requires manual detection, and the detection accuracy is low and the function is single. Summary of the invention

[0004] The purpose of the present invention is to provide an on-load tap changer detection device and a detection method thereof to solve the above technical problems.

[0005] To achieve the above-mentioned purpose, the present invention provides an on-load tap changer detection device, including a conveying mechanism, a controller and a gantry support frame arranged in the middle of the conveying mechanism, the gantry support frame is provided with a detection mechanism, the detection mechanism includes a rotating lifting unit and a detection unit, the rotating lifting unit includes a ball spline arranged on a mounting plate, the ball spline is connected to a rotating drive motor through a belt, the ball spline is connected to a lifting assembly, at least one mounting arm for mounting the detection unit is provided at the bottom end of the ball spline, and the mounting plate is connected to the gantry support frame.

[0006] Preferably, the lifting assembly is a rotary lifting synchronous assembly, which includes a heightening shaft connected to the output shaft of the driving motor, a first synchronous bevel gear is arranged on the heightening shaft, the first synchronous bevel gear is meshed with a second synchronous bevel gear, the second synchronous bevel gear is arranged on the driving shaft, the driving shaft is meshed with a lifting rack through a gear set, the lifting rack is connected to the top of the ball spline through a rotary joint, and a stroke protection switch is arranged on the rotary joint; The rotary drive motor and the stroke protection switch are both electrically connected to the controller.

[0007] Preferably, the lifting component is a detection lifting module, the lifting end of the detection lifting module is connected to the top of the ball spline through a rotary joint, and a travel protection switch is provided on the rotary joint; The detection lifting module and the travel protection switch are both electrically connected to the controller.

[0008] Preferably, an upper support mechanism is provided on the mounting plate, and the upper support mechanism includes a support lifting module, and the support lifting module is connected to a fixed support ring, a synchronous drive gear ring is provided inside the fixed support ring, a plane spiral protrusion is provided at the bottom of the synchronous drive gear ring, and a side surface of the synchronous drive gear ring is meshed with a support drive motor through a gear, and the support drive motor is installed on the fixed support ring, and a radial slide groove is provided on the fixed support ring, and a support seat is provided in the radial slide groove, and an arc groove meshing with the plane spiral protrusion is provided at the bottom of the support seat, and a pressure sensor is provided at the top of the support seat; The support drive motor and the pressure sensor are both electrically connected to the controller.

[0009] Preferably, the detection unit comprises a length adjustment telescopic module, a U-shaped mounting frame is provided at the telescopic end of the length adjustment telescopic module, a spacing adjustment member and a length adjustment member are provided on the U-shaped mounting frame, a first detection sensor for detecting the extension length of the static contact is installed on the spacing adjustment member, and a second detection sensor for detecting the width and flatness of the static contact is installed on the length adjustment member; The length adjustment telescopic module is electrically connected to the controller.

[0010] Preferably, the spacing adjustment member includes a mounting ring, a plurality of arc-shaped detection plates are distributed on the circumference of the mounting ring, a plurality of first detection sensors are linearly distributed on the arc-shaped detection plates, the first detection sensor is a first distance sensor, the arc-shaped detection plates are hinged on the mounting ring through synchronous gears, an adjustment toothed ring meshing with the synchronous gear is provided on the mounting ring, and the adjustment toothed ring is connected to the adjustment motor through gears; The first distance sensor and the adjustment motor are both electrically connected to the controller.

[0011] Preferably, the length adjustment member comprises two telescopic arms slidably arranged on the U-shaped mounting frame, the two telescopic arms are arranged up and down, the bottom of the telescopic arm is connected to the U-shaped mounting frame through an adjustment spring, and a roller is arranged on the top of the telescopic arm, and the second detection sensor is a second distance sensor, and the second distance sensor is linearly distributed on the telescopic arm and the inner side of the U-shaped mounting frame; The second distance sensor is electrically connected to the controller.

[0012] Preferably, the conveying mechanism comprises a chain conveyor, a fixed tool is arranged on the chain conveyor, the fixed tool comprises a tool plate, three clamping telescopic modules are arranged on the tool plate, and positioning blocks are arranged at the telescopic ends of the three clamping telescopic modules, and a pressure sensor is arranged on the positioning block; The chain conveyor, the pressure sensor and the clamping and telescopic module are all electrically connected to the controller.

[0013] Based on the above detection method of an on-load tap changer detection device, the specific steps are as follows: Step S1: placing the cylindrical switch seat on the tooling plate of the conveying mechanism, and extending the telescopic module outward by clamping so that the positioning block contacts the inner wall of the cylindrical switch seat, and the pressure sensor on the positioning block reaches the set value, thereby completing the positioning of the cylindrical switch seat; Step S2: When the cylindrical switch seat moves to the bottom of the gantry support frame under the conveying of the conveying mechanism, the conveying mechanism stops conveying, the upper support mechanism is started, and the support drive motor drives the synchronous drive gear ring to rotate, so that the support seat moves outward along the radial slide groove until the support seat contacts the inner wall of the cylindrical switch seat and the pressure sensor reaches the set value; Step S3: starting the rotary lifting unit, so that the rotary lifting unit drives the detection unit to rotate and descend at the same time to detect the static contact on the cylindrical switch seat; Step S4: After the detection is completed, the next cylindrical switch seat is detected.

[0014] Preferably, the angle of the arc detection plate is adjusted according to the type of the static contact to be tested; when the static contact is a columnar structure, the spacing adjustment member is in a closed state; when the static contact is a two-piece structure, the spacing adjustment member is in an open state.

[0015] Therefore, the present invention adopts the above-mentioned on-load tap changer detection device and detection method, which has the following beneficial effects: (1) The cylindrical switch seat is fixed and positioned by the fixing fixture and the upper supporting mechanism on the conveying mechanism.

[0016] (2) The rotating lifting unit carries the detection unit to detect the static contact, which improves the detection accuracy and efficiency. At the same time, it can also detect the extended length, width, diameter and flatness.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of an on-load tap changer detection device of the present invention; Figure 2 This is a schematic diagram of the fixed tooling structure of the present invention; Figure 3 This is a schematic diagram of the structure of the detection mechanism of Example 1 of the present invention; Figure 4 It is a schematic diagram of the structure of the upper support mechanism of the present invention; Figure 5 An exploded view of the upper support mechanism of the present invention; Figure 6 It is a schematic diagram of the partial structure of the synchronous drive gear ring of the present invention; Figure 7 This is a schematic diagram of the structure of the lifting assembly of Example 1 of the present invention; Figure 8 This is a schematic diagram of the structure of the spacing adjustment member of the present invention; Fig. 9 It is a schematic diagram of the structure of the length adjusting member of the present invention; Fig.10 This is a schematic diagram of the structure of the detection mechanism of Example 2 of the present invention.

[0019] Reference numerals 1. Conveying mechanism; 11. Chain conveyor; 12. Fixing tooling; 13. Clamping telescopic module; 14. Positioning block; 15. Pressure sensor; 2. Gantry support frame; 3. Rotating lifting unit; 31. Mounting plate; 32. Ball spline; 33. Rotating drive motor; 34. Lifting assembly; 341. Heightening shaft; 342. First synchronous bevel gear; 343. Second synchronous bevel gear; 344. Gear set; 345. Lifting rack; 346. Rotating joint; 347. Travel protection switch; 348. Detection lifting module; 35. Mounting arm; 4. Detection unit; 41. Length adjustment Section telescopic module; 42, U-shaped mounting frame; 43, spacing adjustment member; 431, mounting ring; 432, arc detection plate; 433, first distance sensor; 434, synchronous gear; 435, adjustment gear ring; 436, adjustment motor; 44, length adjustment member; 441, telescopic arm; 442, adjustment spring; 443, roller; 444, second distance sensor; 5, upper support mechanism; 51, support lifting module; 52, fixed support ring; 521, radial slide groove; 53, synchronous drive gear ring; 531, flat spiral protrusion; 54, support drive motor; 55, support seat. DETAILED DESCRIPTION

[0020] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0022] Example 1 like Figure 1 As shown, an on-load tap changer detection device comprises a conveying mechanism 1, a controller, a gantry support frame 2 arranged in the middle of the conveying mechanism 1, and a detection mechanism.

[0023] The conveying mechanism 1 includes a chain conveyor 11, on which a fixed tool 12 is provided. Figure 2 As shown, the fixed tooling 12 includes a tooling plate, on which three clamping and telescopic modules 13 are arranged circumferentially, and positioning blocks 14 are arranged at the telescopic ends of the three clamping and telescopic modules 13, and pressure sensors 15 are arranged on the positioning blocks 14, and the chain conveyor 11, the pressure sensor 15 and the clamping and telescopic modules 13 are all electrically connected to the controller. It is used for positioning and conveying the cylindrical switch seat.

[0024] like Figure 3 As shown, the detection mechanism is arranged on the gantry support frame 2, and the detection mechanism includes a rotating lifting unit 3 and a detection unit 4. The rotating lifting unit 3 includes a ball spline 32 arranged on a mounting plate 31, and the ball spline 32 can synchronously realize rotation and lifting. The ball spline 32 is connected to a rotating drive motor 33 through a belt for driving the ball spline 32 to rotate. A mounting arm 35 for mounting the detection unit 4 is arranged at the bottom end of the ball spline 32, and the mounting plate 31 is connected to the gantry support frame 2.

[0025] The mounting plate 31 is provided with an upper support mechanism 5 for fixing and positioning the upper part of the top of the cylindrical switch seat. Figure 4 and Figure 5As shown, the upper support mechanism 5 includes a support lifting module 51 (which can be equipped with an electric push rod, a hydraulic cylinder or a pneumatic cylinder according to actual conditions), the support lifting module 51 is connected to a fixed support ring 52, and a synchronous drive gear ring 53 is arranged in the fixed support ring 52, as shown in FIG. Figure 6 As shown, a plane spiral protrusion 531 is provided at the bottom of the synchronous drive gear ring 53, and the side of the synchronous drive gear ring 53 is meshed with the support drive motor 54 through gears. The support drive motor 54 is installed on the fixed support ring 52, and a radial slide groove 521 is provided on the fixed support ring 52. A support seat 55 is provided in the radial slide groove 521. An arc groove meshing with the plane spiral protrusion 531 is provided at the bottom of the support seat 55. A pressure sensor 15 is provided at the top of the support seat 55. The support drive motor 54 and the pressure sensor 15 are both electrically connected to the controller. After the cylindrical switch seat reaches the bottom of the detection mechanism, the support lifting module 51 extends out, and the support drive motor 54 is started to rotate the synchronous drive gear ring 53 to drive the support seat 55 to move outward along the radial slide groove 521. When the pressure sensor 15 on the support seat 55 reaches the set value, the support drive motor 54 is turned off to achieve the positioning of the upper part of the cylindrical switch seat.

[0026] The lifting assembly 34 of this embodiment is a rotating lifting synchronous assembly, such as Figure 7 As shown, the rotary lifting synchronous assembly includes a heightening shaft 341 connected to the output shaft of the driving motor, a first synchronous bevel gear 342 is arranged on the heightening shaft 341, the first synchronous bevel gear 342 is meshed with a second synchronous bevel gear 343, the second synchronous bevel gear 343 is arranged on the driving shaft, the driving shaft is meshed with a lifting rack 345 through a gear set 344, the lifting rack 345 is connected to the top of the ball spline 32 through a rotary joint 346, and a stroke protection switch 347 is arranged on the rotary joint 346 to ensure that the ball spline 32 stops descending when it descends to the set position to prevent the ball spline 32 from colliding with the fixed tooling 12, and the rotary driving motor 33 and the stroke protection switch 347 are both electrically connected to the controller. The rotary lifting synchronous assembly realizes synchronous rotation during the lifting process, which is suitable for the detection of relatively dense static switches.

[0027] The detection unit 4 includes a length adjustment telescopic module 41 (electric telescopic rod, hydraulic cylinder or air cylinder), and a U-shaped mounting frame 42 is provided at the telescopic end of the length adjustment telescopic module 41. A spacing adjustment member 43 and a length adjustment member 44 are provided on the U-shaped mounting frame 42. A first detection sensor for detecting the extension length of the static contact is installed on the spacing adjustment member 43, and a second detection sensor for detecting the width and flatness of the static contact is installed on the length adjustment member 44. The length adjustment telescopic module 41 is electrically connected to the controller.

[0028] like Figure 8As shown, the spacing adjustment member 43 includes a mounting ring 431, and a plurality of arc detection plates 432 are distributed circumferentially on the mounting ring 431. A plurality of first detection sensors are linearly distributed on the arc detection plate 432. The first detection sensor is a first distance sensor 433. The arc detection plate 432 is hinged on the mounting ring 431 through a synchronous gear 434. An adjustment toothed ring 435 meshing with the synchronous gear 434 is provided on the mounting ring 431. The adjustment toothed ring 435 is connected to the adjustment motor 436 through a gear. The first distance sensor 433 and the adjustment motor 436 are both electrically connected to the controller. The opening and closing degree of each arc detection plate 432 is adjusted according to the type of the static contact to improve the detection accuracy and applicability.

[0029] like Fig. 9 As shown, the length adjustment member 44 is used to detect the width and flatness of the static contact. The length adjustment member 44 includes two telescopic arms 441 slidably arranged on the U-shaped mounting frame 42. The two telescopic arms 441 are arranged up and down. The bottom of the telescopic arm 441 is connected to the U-shaped mounting frame 42 through an adjustment spring 442. A roller 443 is arranged on the top of the telescopic arm 441. The second detection sensor is a second distance sensor 444. The second distance sensor 444 is linearly distributed on the telescopic arm 441 and the inner side of the U-shaped mounting frame 42. The second distance sensor 444 is electrically connected to the controller. The sum of the two second distance sensors 444 arranged relatively up and down is calculated, and the width of the static contact is obtained by subtracting the distance between the two telescopic arms 441 or the distance between the two arms of the U-shaped mounting frame 42 from the above-calculated sum. The flatness (lamellar static contact) or inclination (cylindrical static contact) of the static contact is obtained according to the difference of the second distance sensors 444 arranged in parallel.

[0030] Based on the above detection method of an on-load tap changer detection device, the specific steps are as follows: Step S1: Place the cylindrical switch seat on the tooling plate of the conveying mechanism 1, and extend the positioning block 14 outward by clamping the telescopic module 13 so that the positioning block 14 contacts the inner wall of the cylindrical switch seat, and the pressure sensor 15 on the positioning block 14 reaches the set value, completing the positioning of the cylindrical switch seat.

[0031] Step S2: When the cylindrical switch seat moves to the bottom of the gantry support frame 2 under the conveyance of the conveying mechanism 1, the conveying mechanism 1 stops conveying, starts the upper support mechanism 5, and the support drive motor 54 drives the synchronous drive gear ring 53 to rotate, so that the support seat 55 moves outward along the radial slide groove 521 until the support seat 55 contacts the inner wall of the cylindrical switch seat and the pressure sensor 15 reaches the set value.

[0032] Step S3: Start the rotary lifting unit 3, so that the rotary lifting unit 3 drives the detection unit 4 to rotate and descend at the same time to detect the static contact on the cylindrical switch seat. Adjust the angle of the arc detection plate 432 according to the type of the static contact to be tested; when the static contact is a columnar structure, the spacing adjustment member 43 is in a closed state; when the static contact is a two-piece structure, the spacing adjustment member 43 is in an open state.

[0033] Step S4: After the detection is completed, the next cylindrical switch seat is detected.

[0034] Example 2 The difference between this embodiment and embodiment 1 is that: Fig.10 As shown, the lifting assembly 34 is a detection lifting module 348 (which can be an electric push rod, hydraulic cylinder or air cylinder according to actual conditions), and the lifting end of the detection lifting module 348 is connected to the top of the ball spline 32 through a rotary joint 346. A stroke protection switch 347 is provided on the rotary joint 346. The detection lifting module 348 and the stroke protection switch 347 are both electrically connected to the controller. The lifting assembly 34 is separately provided from the rotary drive motor 33 to realize separate control of lifting and rotating, which is convenient for detection when the static contacts are relatively sparse and improves the detection speed.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An on-load tap changer detection device, comprising a conveying mechanism and a controller, characterized in that: It also includes a gantry support frame arranged in the middle of the conveying mechanism, the gantry support frame is provided with a detection mechanism, the detection mechanism includes a rotating lifting unit and a detection unit, the rotating lifting unit includes a ball spline arranged on a mounting plate, the ball spline is connected to a rotating drive motor through a belt, the ball spline is connected to a lifting assembly, at least one mounting arm for mounting the detection unit is provided at the bottom end of the ball spline, and the mounting plate is connected to the gantry support frame.

2. The on-load tap changer detection device according to claim 1, characterized in that: The lifting assembly is a rotary lifting synchronous assembly, which includes a heightening shaft connected to the output shaft of the driving motor, a first synchronous bevel gear is arranged on the heightening shaft, the first synchronous bevel gear is meshed with a second synchronous bevel gear, the second synchronous bevel gear is arranged on the driving shaft, the driving shaft is meshed with a lifting rack through a gear set, the lifting rack is connected to the top of the ball spline through a rotary joint, and a stroke protection switch is arranged on the rotary joint; The rotary drive motor and the stroke protection switch are both electrically connected to the controller.

3. The on-load tap changer detection device according to claim 1, characterized in that: The lifting component is a detection lifting module, the lifting end of the detection lifting module is connected to the top of the ball spline through a rotary joint, and a travel protection switch is provided on the rotary joint; The detection lifting module and the travel protection switch are both electrically connected to the controller.

4. An on-load tap changer detection device according to claim 2 or 3, characterized in that: An upper support mechanism is arranged on the mounting plate, and the upper support mechanism includes a support lifting module, and the support lifting module is connected to a fixed support ring, a synchronous drive gear ring is arranged inside the fixed support ring, a plane spiral protrusion is arranged at the bottom of the synchronous drive gear ring, and a side surface of the synchronous drive gear ring is meshed with a support drive motor through a gear, and the support drive motor is installed on the fixed support ring, and a radial slide groove is opened on the fixed support ring, and a support seat is arranged in the radial slide groove, and an arc groove meshed with the plane spiral protrusion is arranged at the bottom of the support seat, and a pressure sensor is arranged at the top of the support seat; The support drive motor and the pressure sensor are both electrically connected to the controller.

5. The on-load tap changer detection device according to claim 4, characterized in that: The detection unit comprises a length adjustment telescopic module, a U-shaped mounting frame is provided at the telescopic end of the length adjustment telescopic module, a spacing adjustment member and a length adjustment member are provided on the U-shaped mounting frame, a first detection sensor for detecting the extension length of the static contact is installed on the spacing adjustment member, and a second detection sensor for detecting the width and flatness of the static contact is installed on the length adjustment member; The length adjustment telescopic module is electrically connected to the controller.

6. The on-load tap changer detection device according to claim 5, characterized in that: The spacing adjustment member includes a mounting ring, a plurality of arc detection plates are distributed on the circumference of the mounting ring, a plurality of first detection sensors are distributed linearly on the arc detection plates, the first detection sensor is a first distance sensor, the arc detection plates are hinged on the mounting ring through synchronous gears, an adjustment tooth ring meshing with the synchronous gear is provided on the mounting ring, and the adjustment tooth ring is connected to the adjustment motor through gears; The first distance sensor and the adjustment motor are both electrically connected to the controller.

7. The on-load tap changer detection device according to claim 6, characterized in that: The length adjustment member includes two telescopic arms slidably arranged on the U-shaped mounting frame, the two telescopic arms are arranged up and down, the bottom of the telescopic arm is connected to the U-shaped mounting frame through an adjustment spring, and a roller is arranged on the top of the telescopic arm. The second detection sensor is a second distance sensor, and the second distance sensor is linearly distributed on the telescopic arm and the inner side of the U-shaped mounting frame; The second distance sensor is electrically connected to the controller.

8. The on-load tap changer detection device according to claim 7, characterized in that: The conveying mechanism includes a chain conveyor, on which a fixed tool is arranged, the fixed tool includes a tool plate, on which three clamping and telescopic modules are arranged distributed circumferentially, and the telescopic ends of the three clamping and telescopic modules are arranged with positioning blocks, and the positioning blocks are arranged with pressure sensors; The chain conveyor, the pressure sensor and the clamping and telescopic module are all electrically connected to the controller.

9. A detection method for an on-load tap changer detection device according to claim 8, characterized in that: The specific steps are as follows: Step S1: placing the cylindrical switch seat on the tooling plate of the conveying mechanism, and extending the telescopic module outward by clamping so that the positioning block contacts the inner wall of the cylindrical switch seat, and the pressure sensor on the positioning block reaches the set value, thereby completing the positioning of the cylindrical switch seat; Step S2: When the cylindrical switch seat moves to the bottom of the gantry support frame under the conveying of the conveying mechanism, the conveying mechanism stops conveying, the upper support mechanism is started, and the support drive motor drives the synchronous drive gear ring to rotate, so that the support seat moves outward along the radial slide groove until the support seat contacts the inner wall of the cylindrical switch seat and the pressure sensor reaches the set value; Step S3: starting the rotary lifting unit, so that the rotary lifting unit drives the detection unit to rotate and descend at the same time to detect the static contact on the cylindrical switch seat; Step S4: After the detection is completed, the next cylindrical switch seat is detected.

10. A detection method for an on-load tap changer detection device according to claim 9, characterized in that: The angle of the arc detection plate is adjusted according to the type of the static contact to be tested; when the static contact is a columnar structure, the spacing adjustment piece is in a closed state; when the static contact is a two-piece structure, the spacing adjustment piece is in an open state.

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