Off-load regulating transformer semi-finished product tap changer switching tool

Abstract

The application provides a no-load voltage regulating transformer semi-finished product tapping switch switching tool, and belongs to the technical field of transformers. The tool comprises a reversing assembly, a driven assembly and a driving assembly. The reversing assembly is used for being fixed above a temporary transmission rod. The reversing assembly has a power output end extending downward in the vertical direction. The reversing assembly also has a power input end, and the extension direction of the power input end is arranged at an angle with the power output end. The upper end of the driven assembly is connected with the power output end. The lower end of the driven assembly is used for being connected with the temporary transmission rod. One end of the driving assembly is connected with the power input end, and the other end extends to a height suitable for ground personnel to operate. The driving assembly drives the driven assembly to rotate through the reversing assembly, and then drives the temporary transmission rod to rotate. The no-load voltage regulating transformer semi-finished product tapping switch switching tool provided by the application is convenient to operate and has high safety.

Description

Technical Field

[0001] This invention belongs to the field of transformer technology, and more specifically, relates to a tap changer switching tool for a semi-finished no-load tap-changing transformer. Background Technology

[0002] Large-capacity no-load tap changers typically use "drum-type" switches. The advantages of this type of tap changer are that it is easy to operate, and the moving contact can be automatically positioned during switching under the action of the spring, preventing accidents caused by loose connections.

[0003] In the existing technology, when conducting electrical tests on semi-finished no-load tap-changing transformers, some structures are not yet fully installed. Therefore, the switching operation can only be performed by rotating a temporary transmission rod located at a high position. Specifically, during operation, the operator needs to stand on the transformer body or use a ladder or other high-altitude work platform to raise the operator's height so that the operator's hands can reach the temporary transmission rod and rotate it. This switching method is not only inconvenient to operate, but also increases the risk of the operator falling from a height. Summary of the Invention

[0004] The purpose of this invention is to provide a tap changer switching tool for a semi-finished no-load tap-changing transformer, which aims to solve the technical problems of inconvenient operation and high operational risk of existing switch switching methods.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a tap changer switching tool for a no-load tap-changing transformer semi-finished product, comprising:

[0006] A reversing assembly is used to fix it above a temporary drive rod; the reversing assembly has a power output end extending downward in a vertical direction; the reversing assembly also has a power input end, the extension direction of the power input end being set at an angle to the power output end;

[0007] The driven component, with its upper end connected to the power output end; and its lower end used to connect to the temporary transmission rod; and

[0008] The active component is connected at one end to the power input end and extends to a height suitable for operation by ground personnel.

[0009] The active component drives the driven component to rotate through the reversing component, which in turn drives the temporary transmission rod to rotate.

[0010] In one possible implementation, the commutation component includes:

[0011] A mounting box is used to secure the temporary transmission rod to the top.

[0012] A first drive shaft extends vertically and is rotatably connected to the bottom wall of the fixed box. One end of the first drive shaft extends downward through the fixed box to form the power output end, and the other end of the first drive shaft is located inside the fixed box and connected to a first gear.

[0013] The second drive shaft is rotatably connected to the wall of the fixed box and is set at an angle to the first drive shaft; one end of the second drive shaft extends outward from the fixed box to form the power input end; the other end of the second drive shaft is located inside the fixed box and is connected to a second gear, which meshes with the first gear.

[0014] In one possible implementation, the active component includes:

[0015] The first universal joint has one end connected to the power input end and the other end extending downward to a height suitable for operation by ground personnel; the first universal joint has a first degree of freedom to extend and retract along its axial direction.

[0016] Turn the handle to connect to the extension end of the first universal joint.

[0017] In one possible implementation, the driven component includes:

[0018] The second universal joint is connected at its upper end to the power output end; the second universal joint has a second degree of freedom to extend and retract along its axial direction.

[0019] A first connector is used to snap onto the temporary transmission rod; the top of the first connector is connected to the lower end of the second universal joint.

[0020] In some embodiments, the first connector includes:

[0021] The locking block has a downward-facing locking groove for engaging with the temporary transmission rod;

[0022] A connecting shaft is fixed vertically to the top of the clamping block, and the upper end of the connecting shaft is connected to the lower end of the second universal joint.

[0023] In one possible implementation, the card block is provided with a limiting component; the limiting component has a limiting state that extends into the card slot, and the limiting component also has a yielding state that retracts out of the card slot;

[0024] When the limiting component is in the limiting state, the limiting component abuts against the temporary transmission rod.

[0025] In some embodiments, the limiting component includes:

[0026] Two limiting plates are symmetrically arranged on both sides of the slot; one end of each limiting plate is hinged to the card block, and the other end is a swing end. In the limiting state, the swing ends of the two limiting plates are engaged with each other.

[0027] Two sets of first limiting members are disposed within the card block and are respectively located on the outer side of the two limiting plates that are far apart from each other; the two sets of first limiting members are respectively used to elastically push the swing ends of the two limiting plates closer to each other to the limiting state.

[0028] For example, the first limiting member includes:

[0029] The first limiting block is slidably connected inside the card block along a direction perpendicular to the two opposite sides of the card slot;

[0030] The first elastic element has one end connected to the end of the first limiting block away from the slot, and the other end fixedly connected to the block.

[0031] A limiting rod is slidably connected to the locking block along a sliding direction perpendicular to the first limiting block; the limiting rod is used to slide down to separate the first limiting block and the limiting plate; the limiting rod is also used to slide up so that the first limiting block can slide to abut against the limiting plate under the pushing action of the first elastic member.

[0032] In some embodiments, the card block is further provided with a second limiting member, the second limiting member including a second limiting block slidably connected in the card block along a sliding direction perpendicular to the first limiting block, the second limiting block being connected to the limiting rod;

[0033] When the temporary transmission rod is inserted into the slot from bottom to top, the second limiting block is used to slide into the slot under the pressure of the temporary transmission rod, and drive the limiting rod to slide along the sliding direction perpendicular to the first limiting block to block or make way for the first limiting block.

[0034] For example, the second limiting member further includes a second elastic member, one end of which is connected to the end of the second limiting block away from the slot, and the other end of which is fixedly connected to the slot.

[0035] Compared with the prior art, the solution shown in this application rotates the active component, causing the rotating component to drive the power input end of the commutation component to rotate. The commutation component then transmits the rotation of the power input end to the power output end. The rotation of the power output end of the commutation component drives the rotation of the driven component, thereby driving the rotation of the temporary transmission rod to achieve switch switching. The solution provided in this application is simple to operate when switching, and only requires standing on the ground and rotating the lower end of the active component to complete the operation, which is highly safe. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A schematic diagram of the structure of the tap changer switching tool for the no-load tap-changing transformer semi-finished product provided in this embodiment of the invention. Figure 1 ;

[0038] Figure 2 A schematic diagram of the structure of the tap changer switching tool for the no-load tap-changing transformer semi-finished product provided in this embodiment of the invention. Figure 2 ;

[0039] Figure 3 This is a schematic diagram of the main structure of the tap changer switching tool for a no-load tap-changing transformer semi-finished product provided in an embodiment of the present invention. Figure 3 ;

[0040] Figure 4 This is a schematic diagram of the connection structure of the limiting component and the second limiting member used in the embodiments of the present invention. Figure 1 ;

[0041] Figure 5 This is a schematic diagram of the connection structure of the limiting component and the second limiting member used in the embodiments of the present invention. Figure 2 .

[0042] In the diagram: 1. Reversing assembly; 11. Fixed box; 12. First drive shaft; 13. Second drive shaft; 14. First gear; 15. Second gear; 2. Driven assembly; 21. Second universal joint; 22. First connecting member; 221. Connecting shaft; 222. Locking block; 2221. Locking groove; 3. Driving assembly; 31. First universal joint; 32. Rotating handle; 4. Temporary transmission rod; 5. Limiting assembly; 51. Limiting plate; 52. First limiting member; 521. First elastic member; 522. First limiting block; 523. Limiting rod; 6. Second limiting member; 61. Second limiting block; 62. Second elastic member; 7. Switch-type magnetic base. Detailed Implementation

[0043] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0044] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on that other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0045] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a number" means two or more, unless otherwise explicitly specified.

[0046] Please refer to the following: Figures 1 to 5 The tap changer switching tool for a semi-finished no-load tap-changing transformer provided by this invention will now be described. The tap changer switching tool for a semi-finished no-load tap-changing transformer includes a reversing assembly 1, a driven assembly 2, and an active assembly 3. The reversing assembly 1 is fixed above a temporary transmission rod 4. The reversing assembly 1 has a power output end extending downwards in a vertical direction. The reversing assembly 1 also has a power input end, the extension direction of which forms an angle with the power output end. The upper end of the driven assembly 2 is connected to the power output end. The lower end of the driven assembly 2 is used to connect to the temporary transmission rod 4. One end of the active assembly 3 is connected to the power input end, and the other end extends to a height suitable for operation by ground personnel. The active assembly 3 drives the driven assembly 2 to rotate through the reversing assembly 1, thereby driving the temporary transmission rod 4 to rotate.

[0047] For example, attached Figure 1 The middle section describes the implementation method where the power input end is perpendicular to the power output end, i.e., the extending directions of the power input end and the power output end form a 90-degree angle; Appendix Figure 3 The embodiment shown is where the power input end is parallel to the power output end, meaning the extending directions of the power input end and the power output end form a zero-degree angle. The commutation assembly 1 is used to transmit the rotation of the power input end to the power output end. Optionally, the extending directions of the power input end and the power output end can also form an angle of other degrees.

[0048] The tap changer switching tool for a semi-finished no-load tap-changing transformer provided by this invention, compared with the prior art, rotates the active component 3, causing the rotating component to drive the power input end of the commutation component 1 to rotate. The commutation component 1 transmits the rotation of the power input end to the power output end; and through the rotation of the power output end of the commutation component 1, it drives the rotation of the driven component 2, thereby driving the rotation of the temporary transmission rod 4 to realize the switch switching. The solution provided by this application is simple to operate when switching, and only requires standing on the ground to rotate the lower end of the active component 3 to complete the operation, which is highly safe.

[0049] Please see Figure 1 and Figure 3 In some possible embodiments, the reversing assembly 1 includes a fixed housing 11, a first drive shaft 12, and a second drive shaft 13. The fixed housing 11 is fixed above the temporary drive rod 4. The first drive shaft 12 extends vertically and is rotatably connected to the bottom wall of the fixed housing 11. One end of the first drive shaft 12 extends downward through the fixed housing 11 and forms a power output end. The other end of the first drive shaft 12 is located inside the fixed housing 11 and is connected to a first gear 14. The second drive shaft 13 is rotatably connected to the wall of the fixed housing 11 and is set at an angle to the first drive shaft 12. One end of the second drive shaft 13 extends outward through the fixed housing 11 and forms a power input end. The other end of the second drive shaft 13 is located inside the fixed housing 11 and is connected to a second gear 15, which meshes with the first gear 14.

[0050] The rotation of the power input end is transmitted to the power output end through the meshing of the first gear 14 and the second gear 15; specifically, the first drive shaft 12 and the second drive shaft 13 are respectively rotatably connected to the side wall of the fixed box 11.

[0051] Optionally, the fixing box 11 can be fixed by a switchable magnetic base 7; the working principle and specific structure of the switchable magnetic base 7 are existing technologies and will not be described in detail here. Specifically, the switchable magnetic base 7 is used to fix the commutation assembly 1 above the temporary transmission rod 4, and preferably, the switchable magnetic base 7 is attracted to the clamps on the transformer body.

[0052] As a specific embodiment of the commutation component 1 described above, please refer to Figure 1 The first drive shaft 12 and the second drive shaft 13 are arranged vertically, and the first gear 14 and the second gear 15 that mesh with each other adopt a bevel gear structure to achieve reversal.

[0053] As another specific embodiment of the aforementioned commutation component 1, please refer to... Figure 3 The first drive shaft 12 and the second drive shaft 13 are arranged in parallel, and the first gear 14 and the second gear 15 that mesh with each other adopt a spur gear structure to achieve reversal.

[0054] Optionally, the transmission method of the first gear 14 and the second gear 15 can also be a bevel gear transmission or a worm gear transmission, which can transmit the rotation of the power input end to the power output end.

[0055] Please see Figure 1 In some possible embodiments, the active component 3 includes a first universal joint 31 and a rotary handle 32; one end of the first universal joint 31 is connected to the power input end, and the other end extends downward to a height suitable for operation by ground personnel; the first universal joint 31 has a first degree of freedom to extend and retract along its axial direction; the rotary handle 32 is connected to the extended end of the first universal joint 31.

[0056] By setting a first universal joint 31, the rotation of the rotating shaft is transmitted to the power input end. It should be noted that the first universal joint 31 is a telescopic universal joint, which has the aforementioned first degree of freedom and can be easily adjusted in length to accommodate different operator heights.

[0057] It should be noted that the first universal joint 31 and the second universal joint 21 used in this application are telescopic universal joints, which can transmit rotation and tilt to adjacent connected parts. The specific structure and working principle are all prior art, and will not be described in detail here.

[0058] Please see Figure 1 In some possible embodiments, the driven component 2 includes a second universal joint 21 and a first connector 22. The upper end of the second universal joint 21 is connected to the power output end. The second universal joint 21 has a second degree of freedom that extends and retracts along its axial direction. The first connector 22 is used to engage with the temporary transmission rod 4. The top of the first connector 22 is connected to the lower end of the second universal joint 21.

[0059] The first connector 22 is used to fix itself to the temporary transmission rod 4 to facilitate the rotation of the temporary transmission rod 4. The second universal joint 21 is used to facilitate the transmission of the rotation of the power output end to the first connector 22.

[0060] Specifically, as one embodiment of the aforementioned driven component 2, when the power output end is located diagonally above the temporary transmission rod 4, an additional... Figure 1 In one embodiment, the driven component 2 includes a second universal joint 21 and a first connector 22. The top of the first connector 22 is connected to the lower end of the second universal joint 21, and rotation can be transmitted through the second universal joint 21.

[0061] Specifically, as another embodiment of the aforementioned driven component 2, when the power output end is located directly above the temporary transmission rod 4, an additional... Figure 2In the implementation of the above method, the driven component 2 includes a first connector 22, the top of which is connected to the power output end, so that rotation can be easily transmitted without the need for a second universal joint 21.

[0062] Please see Figure 1 In some embodiments, the first connector 22 includes a locking block 222 and a connecting shaft 221; the locking block 222 is provided with a downward-opening slot 2221, which is used to engage with the temporary transmission rod 4; the connecting shaft 221 is fixed vertically to the top of the locking block 222, and the upper end of the connecting shaft 221 is connected to the lower end of the second universal joint 21.

[0063] The aforementioned slot 2221 facilitates the engagement of the temporary transmission rod 4 within it, thereby securing the temporary transmission rod 4. Specifically, the width of the slot 2221 is slightly smaller than the diameter of the temporary transmission rod 4 to ensure its secure fixation.

[0064] Please see Figure 4 and Figure 5 In some possible embodiments, the card block 222 is provided with a limiting component 5; the limiting component 5 has a limiting state that extends into the card slot 2221, and the limiting component 5 also has a yielding state that retracts out of the card slot 2221; wherein, when the limiting component 5 is in the limiting state, the limiting component 5 abuts against the temporary transmission rod 4.

[0065] Specifically, when the aforementioned limiting component 5 is in the yielding state, it is convenient to engage the temporary transmission rod 4 in the slot 2221; by setting the limiting component 5, the temporary transmission rod 4 is limited after it is engaged in the slot 2221, thereby increasing the stability of the temporary transmission rod 4.

[0066] Please see Figure 4 For example, the limiting component 5 includes two limiting plates 51 and two sets of first limiting members 52; the two limiting plates 51 are symmetrically arranged on both sides of the slot 2221; one end of the limiting plate 51 is hinged to the block 222, and the other end is a swing end. In the limiting state, the swing ends of the two limiting plates 51 are engaged with each other; the two sets of first limiting members 52 are arranged in the block 222 and are respectively located on the outer side of the two limiting plates 51 that are far apart from each other; the two sets of first limiting members 52 are respectively used to elastically push the swing ends of the two limiting plates 51 closer to each other to the limiting state.

[0067] When the first limiting member 52 extends, the limiting plate 51 is used to swing into the slot 2221 to abut against the temporary transmission rod 4, forming a limiting state; when the first limiting member 52 retracts, the limiting plate 51 is used to swing away from the slot 2221, forming a yielding state.

[0068] Optionally, the limiting plate 51 can be an arc-shaped plate that matches the temporary transmission rod 4, so as to facilitate the limiting of the temporary transmission rod 4. The first limiting member 52 is used to abut against the corresponding limiting plate 51. When the first limiting member 52 extends, it can push the limiting plate 51 to swing to the above-mentioned limiting state.

[0069] Please see Figure 4 In some embodiments, the first limiting member 52 includes a first elastic member 521, a first limiting block 522, and a limiting rod 523; the first limiting block 522 is slidably connected to the locking block 222 along a direction perpendicular to the opposite side walls of the locking groove 2221; one end of the first elastic member 521 is connected to the end of the first limiting block 522 away from the locking groove 2221, and the other end is fixedly connected to the locking block 222; the limiting rod 523 is slidably connected to the locking block 222 along a sliding direction perpendicular to the first limiting block 522; the limiting rod 523 is used to slide down to separate the first limiting block 522 and the limiting plate 51; the limiting rod 523 is also used to slide up so that the first limiting block 522 can slide to abut against the limiting plate 51 under the pushing action of the first elastic member 521.

[0070] Specifically, the card block 222 has a first sliding groove along the direction perpendicular to the opposite side walls of the card slot 2221, the first limiting block 522 slides in the first sliding groove, and the first elastic member 521 is provided in the first sliding groove.

[0071] It should be understood that when the limiting rod 523 slides into the first sliding groove, the first limiting block 522 abuts against the limiting rod 523, so that the first limiting block 522 is in a retracted state; when the limiting rod 523 slides out of the first sliding groove, the first limiting block 522 abuts against the limiting plate 51, and the first elastic element 521 drives the first limiting block 522 to extend.

[0072] Specifically, when the limiting rod 523 slides into the first groove, the first limiting block 522 abuts against the limiting rod 523, and the first limiting block 522 is limited and in a retracted state. The limiting plate 51 swings to a position away from each other, that is, away from the slot 2221, in order to achieve the above-mentioned clearance state. When the limiting rod 523 slides out of the first groove, the first limiting block 522 extends outward and abuts against the limiting plate 51 when it extends outward, so as to push the limiting plate 51 to swing into the slot 2221. The limiting plate 51 swings to a position close to each other, that is, swings into the slot 2221 and abuts against the temporary transmission rod 4, in order to achieve the above-mentioned limiting state.

[0073] Please see Figure 4In some embodiments, the card block 222 is further provided with a second limiting member 6. The second limiting member 6 includes a second limiting block 61 that is slidably connected in the card block 222 along a sliding direction perpendicular to the first limiting block 522. The second limiting block 61 is connected to the limiting rod 523. When the temporary transmission rod 4 is inserted into the card slot 2221 from bottom to top, the second limiting block 61 is used to slide into the card block 222 under the compression of the temporary transmission rod 4, and drive the limiting rod 523 to slide along a sliding direction perpendicular to the first limiting block 522 to block or give way to the first limiting block 522.

[0074] Specifically, the card block 222 has a second sliding groove along the sliding direction perpendicular to the first limiting block 522, the second limiting block 61 slides in the second sliding groove, and the second elastic member 62 is provided in the second sliding groove.

[0075] By setting a second limiting block 61, the limiting rod 523 is driven to slide in a direction perpendicular to the first slide groove, thereby causing the limiting rod 523 to slide out of the first slide groove.

[0076] Please see Figure 4 and Figure 5 For example, the second limiting member 6 further includes a second elastic member 62, one end of which is connected to the end of the second limiting block 61 away from the slot 2221, and the other end of which is fixedly connected to the slot 222. The second elastic member 62 is used to reset the second limiting block 61 when the temporary transmission rod 4 is not installed.

[0077] Specifically, when the temporary transmission rod 4 is inserted into the bottom of the slot 2221 from bottom to top, the temporary transmission rod 4 presses the second limiting block 61, causing the second limiting block 61 to slide away from the slot 2221. The second limiting block 61 presses the second elastic member 62 and drives the limiting rod 523 to slide out of the first sliding groove.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tap changer switching tool for a semi-finished no-load tap-changing transformer, characterized in that, include: A reversing assembly is used to fix it above a temporary drive rod; the reversing assembly has a power output end extending downward in a vertical direction; the reversing assembly also has a power input end, the extension direction of the power input end being set at an angle to the power output end; The driven component has its upper end connected to the power output end; the lower end of the driven component is used to connect to the temporary transmission rod. as well as The active component is connected at one end to the power input end and extends to a height suitable for operation by ground personnel. The active component drives the driven component to rotate via the reversing component, which in turn drives the temporary transmission rod to rotate. The driven component includes a second universal joint and a first connecting member. The upper end of the second universal joint is connected to the power output end. The second universal joint has a second degree of freedom that extends and retracts along its axial direction. The first connecting member is used to engage with the temporary transmission rod. The top of the first connecting member is connected to the lower end of the second universal joint. The first connecting member includes a locking block and a connecting shaft. The locking block has a downward-opening slot for engaging with the temporary transmission rod. The connecting shaft is fixed vertically to the top of the locking block, and the upper end of the connecting shaft is connected to the lower end of the second universal joint.

2. The tap changer switching tool for a no-load tap-changing transformer semi-finished product as described in claim 1, characterized in that, The commutation component includes: A mounting box is used to secure the temporary transmission rod to the top. A first drive shaft extends vertically and is rotatably connected to the bottom wall of the fixed box. One end of the first drive shaft extends downward through the fixed box to form the power output end, and the other end of the first drive shaft is located inside the fixed box and connected to a first gear. The second drive shaft is rotatably connected to the wall of the fixed box and is set at an angle to the first drive shaft; one end of the second drive shaft extends outward from the fixed box to form the power input end; the other end of the second drive shaft is located inside the fixed box and is connected to a second gear, which meshes with the first gear.

3. The tap changer switching tool for a no-load tap-changing transformer semi-finished product as described in claim 1, characterized in that, The active component includes: The first universal joint has one end connected to the power input end and the other end extending downward to a height suitable for operation by ground personnel; the first universal joint has a first degree of freedom to extend and retract along its axial direction. Turn the handle to connect to the extension end of the first universal joint.

4. The tap changer switching tool for a no-load tap-changing transformer semi-finished product as described in claim 1, characterized in that, The card block is provided with a limiting component; the limiting component has a limiting state that extends into the card slot, and the limiting component also has a yielding state that retracts out of the card slot; When the limiting component is in the limiting state, the limiting component abuts against the temporary transmission rod.

5. The tap changer switching tool for a no-load tap-changing transformer semi-finished product as described in claim 4, characterized in that, The limiting component includes: Two limiting plates are symmetrically arranged on both sides of the slot; one end of each limiting plate is hinged to the card block, and the other end is a swing end. In the limiting state, the swing ends of the two limiting plates are engaged with each other. Two sets of first limiting members are disposed within the card block and are respectively located on the outer side of the two limiting plates that are far apart from each other; the two sets of first limiting members are respectively used to elastically push the swing ends of the two limiting plates closer to each other to the limiting state.

6. The tap changer switching tool for a no-load tap-changing transformer semi-finished product as described in claim 5, characterized in that, The first limiting member includes: The first limiting block is slidably connected inside the card block along a direction perpendicular to the two opposite sides of the card slot; The first elastic element has one end connected to the end of the first limiting block away from the slot, and the other end fixedly connected to the block. A limiting rod is slidably connected to the locking block along a sliding direction perpendicular to the first limiting block; the limiting rod is used to slide down to separate the first limiting block and the limiting plate; the limiting rod is also used to slide up so that the first limiting block can slide to abut against the limiting plate under the pushing action of the first elastic member.

7. The tap changer switching tool for a no-load tap-changing transformer semi-finished product as described in claim 6, characterized in that, The card block is also provided with a second limiting member, the second limiting member including a second limiting block slidably connected in the card block along a sliding direction perpendicular to the first limiting block, the second limiting block being connected to the limiting rod; When the temporary transmission rod is inserted into the slot from bottom to top, the second limiting block is used to slide into the slot under the pressure of the temporary transmission rod, and drive the limiting rod to slide along the sliding direction perpendicular to the first limiting block to block or make way for the first limiting block.

8. The tap changer switching tool for a no-load tap-changing transformer semi-finished product as described in claim 7, characterized in that, The second limiting member further includes a second elastic member, one end of which is connected to the end of the second limiting block away from the slot, and the other end of which is fixedly connected to the slot.

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