A contact assembly fastening structure and assembly method for an on-load tap changer.

Abstract

This invention provides a contact assembly fastening structure and assembly method for an on-load tap changer. The fastening structure includes an insulating spindle, a contact assembly, and a clamp. The contact assembly and the clamp are connected by multiple clamping screws to form an assembly that surrounds the insulating spindle. A clamping plate is provided inside the insulating spindle, and each clamping plate has a threaded hole. Through holes and countersunk holes are pre-set on the side wall of the insulating spindle, and each through hole and countersunk hole communicates one-to-one with the threaded hole. A connecting screw is fitted into each countersunk hole, passing through the countersunk hole and then threaded into the threaded hole. Each assembly has multiple mounting holes that communicate one-to-one with the through holes on the insulating spindle. A fastening screw is fitted into each mounting hole, passing through the mounting hole and through hole in sequence and then threaded into the threaded hole. This invention improves the working environment, ensures the health of workers, and increases work efficiency. At the same time, the contact assembly fixing method is more reliable, ensuring the quality of the tap changer.

Description

Technical Field

[0001] This invention belongs to the field of on-load tap changer technology, specifically relating to the fastening structure of contact groups for on-load tap changers and its assembly method. Background Technology

[0002] In existing on-load tap changers, the contact assembly and spindle need to be pre-assembled before drilling. This involves machining threads on the insulated spindle, which generates a large amount of dust during drilling. Inhaling this dust can cause significant harm to humans and causes substantial environmental pollution. Cleaning this dust is difficult, resulting in a poor working environment. Furthermore, due to the poor rigidity and toughness of the insulated spindle, excessive force during threading and screw fixing of the contact assembly to the spindle, or increased tap changer operation, can damage the threads, leading to loosening of the contact assembly and potential safety hazards. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide a fastening structure for the contact assembly of an on-load tap changer and its assembly method. By employing this fastening structure, the drilling process is eliminated during the fixing of the on-load tap changer contact assembly to the spindle, improving the working environment, ensuring the health of workers, and increasing work efficiency. Furthermore, the need to machine threads on the insulated spindle is eliminated, making the contact assembly fixing method more reliable, ensuring the quality of the tap changer, and enhancing market competitiveness.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A contact assembly fastening structure for an on-load tap changer includes a hollow cylindrical insulating spindle, a contact assembly, and a clamp. The contact assembly and the clamp are connected by multiple clamping screws to form an assembly that surrounds the insulating spindle. Inside the insulating spindle, corresponding to each assembly, at least one clamping plate is provided, and each clamping plate has multiple threaded holes. On the side wall of the insulating spindle, opposite each clamping plate's threaded hole, multiple through holes and multiple countersunk holes are pre-set, each through hole and countersunk hole communicating one-to-one with the threaded hole. Each countersunk hole is equipped with a connecting screw. After passing through the countersunk hole, the connecting screw is threaded into the corresponding threaded hole on the clamping plate, eliminating the need to machine threads on the insulated spindle and locking the insulated spindle to the clamping plate. Each assembly has multiple mounting holes that are connected one-to-one with the through holes on the insulated spindle. Each mounting hole is equipped with a fastening screw. The fastening screw passes through the mounting hole and the through hole connected to it in sequence and is threaded into the corresponding threaded hole on the clamping plate, locking the clamp, the insulated spindle, and the clamping plate.

[0006] Furthermore, the contact group includes an upper contact group and a lower contact group, and there are two clamps. One clamp is connected to the upper contact group by a set of clamping screws to form a ring body and then surrounds the outside of the insulating main shaft. The other clamp is connected to the lower contact group by another set of clamping screws to form a ring body and then surrounds the outside of the insulating main shaft.

[0007] Furthermore, the mounting holes are respectively located at both ends of the upper contact group and both ends of the lower contact group.

[0008] Furthermore, the clamping plates are two in number and are respectively positioned on the inner side of the insulating spindle, directly opposite the upper contact group and the lower contact group.

[0009] Furthermore, each clamping plate on the insulated spindle has two through holes and two countersunk holes, and each clamping plate has four threaded holes.

[0010] Furthermore, two countersunk holes are positioned between two through holes.

[0011] Furthermore, the clamping plate is arc-shaped and fits against the inner wall of the insulated spindle.

[0012] Furthermore, the clamping plate is a metal plate with high strength, and the threads of the threaded holes on it are not easily damaged, so the contact assembly is not easily loosened.

[0013] The assembly method of the contact group fastening structure for the on-load tap changer includes the following steps:

[0014] S1. Fix the clamping plate to the inside of the insulated spindle to form a combined assembly.

[0015] S2. Fix the upper contact assembly and clamp with clamping screws and surround the outside of the insulating spindle. Then, use fastening screws to pass through the mounting holes on the upper contact assembly and the through holes of the insulating spindle in sequence, and then thread them into the corresponding threaded holes in the clamping plate.

[0016] S3. Fix the lower contact assembly and the clamp with another set of clamping screws and surround the outside of the insulating spindle. Then, use fastening screws to pass through the mounting holes on the lower contact assembly and the through holes of the insulating spindle 1 in sequence, and then thread them into the corresponding threaded holes in the clamping plate.

[0017] This invention overcomes the shortcomings of existing technologies by pre-drilling holes in the insulating spindle and adding a metal clamp plate inside the insulating spindle. The clamp plate is threaded, and screws pass through the contact assembly and the insulating spindle, fastening them to the metal clamp plate. This avoids fixing the contact assembly on the insulating spindle using a drill bit. The entire assembly process of this invention eliminates the drilling process, improves the working environment, ensures the health of workers, and increases work efficiency. It also eliminates the need to machine threads on the insulating spindle, making the contact assembly fixing method more reliable, ensuring the quality of the tap changer, and enhancing market competitiveness. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the overall installation of the contact fastening structure for the on-load tap changer described in this invention.

[0020] Figure 2 This is a schematic diagram of the structure of the clamping plate described in this invention;

[0021] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0022] Figure 4 This is a schematic diagram of the structure of the insulated spindle described in this invention;

[0023] Figure 5 for Figure 4 A cross-sectional view along the BB direction;

[0024] Figure 6 This is a schematic diagram of the pre-assembly of the insulated spindle and the metal clamping plate according to the present invention;

[0025] As shown in the figure: 1-Insulated spindle, 2-Upper contact group, 3-Clamping plate, 4-Fasting screw, 5-Lower contact group, 6-Clamping clamp, 7-Through hole, 8-Counterhead hole, 9-Connecting screw, 10-Assembly, 11-Clamping screw, 12-Threaded hole. Detailed Implementation

[0026] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example

[0029] like Figure 1-6 As shown, this embodiment provides a contact assembly fastening structure for an on-load tap changer, including an insulating spindle 1, a contact assembly, a clamp 6, and a clamping plate 3.

[0030] The insulated spindle 1 is a component of an on-load tap changer. It is a hollow cylindrical shape and made of insulating material.

[0031] The contact assembly and the clamp 6 are connected by multiple clamping screws 11 to form an assembly that surrounds the insulated spindle 1.

[0032] Specifically, the contact group includes an upper contact group 2 and a lower contact group 5. There are two clamps 6. One clamp 6 is connected to the upper contact group 2 by a set of clamping screws 11 (each set includes at least four clamping screws 11) to form an annular body and then surrounds the insulating main shaft 1. The other clamp 6 is connected to the lower contact group 5 by another set of clamping screws 11 (each set includes at least four clamping screws 11) to form an annular body and then surrounds the insulating main shaft 1.

[0033] Two clamping plates 3 are provided inside the insulating spindle 1 for each assembly. The two clamping plates 3 are respectively positioned on the inner side of the insulating spindle 1, directly opposite the upper contact group 2 and the lower contact group 5 (that is, one clamping plate 3 is directly opposite the upper contact group 2 and attached to the inner side of the insulating spindle 1, and the other clamping plate 3 is directly opposite the lower contact group 5 and attached to the inner side of the insulating spindle 1). Each clamping plate 3 has multiple threaded holes 12. Each clamping plate 3 is an arc-shaped metal plate and is attached to the inner wall of the insulating spindle 1. The metal clamping plates 3 have high strength, and the threads of the threaded holes on them are not easily damaged, so the contact group is not easy to loosen.

[0034] On the side wall of the insulating spindle 1, opposite each clamping plate 3, there is a layer of assembly holes. Each layer of assembly holes includes two through holes 7 and two countersunk holes 8 (the through holes 7 and countersunk holes 8 are pre-made before leaving the factory, so there is no need to drill on site). The two countersunk holes 8 are set between the two through holes 7. The through holes 7 and countersunk holes 8 of each layer of assembly holes are connected one-to-one with the threaded holes 12 on the clamping plate 3 opposite to the layer of assembly holes. A connecting screw 9 is installed in each countersunk hole 8. The connecting screw 9 passes through the countersunk hole 8 and is threaded into the corresponding threaded hole 12 on the clamping plate 3 to lock the insulating spindle 1 and the clamping plate 3.

[0035] Two layers of mounting holes are provided on the insulating spindle 1, one layer facing the upper contact group 2 and the other layer facing the lower contact group 5. Each assembly has multiple mounting holes that connect one-to-one with the through holes 7 on the insulating spindle 1. Specifically, each end of the upper contact group 2 has mounting holes that connect one-to-one with the through holes 7 in the corresponding layer of mounting holes, and each end of the lower contact group 5 also has mounting holes that connect one-to-one with the through holes 7 in the corresponding layer of mounting holes. A fastening screw 4 is installed in each mounting hole. The fastening screw 4 passes through the mounting hole and the through hole 7 connected to it, and is then threaded into the corresponding threaded hole 12 on the clamping plate 3, locking the clamp 6, the insulating spindle 1, and the clamping plate 3. The assembly and the clamping plate 3 cooperate and clamp each other inside and outside the insulating spindle 1, thereby locking the contact group onto the insulating spindle 1.

[0036] The assembly steps are as follows:

[0037] S1. Before assembly, the clamping plate 3 needs to be fixed on the insulating spindle 1. The clamping plate 3 is sent into the insulating spindle 1 through a special tooling. Then, the connecting screw 9 passes through the countersunk hole 8 on the insulating spindle 1 and is threaded into the corresponding threaded hole 12 of the clamping plate 3 on the outside of the insulating spindle 1. The clamping plate 3 is fixed inside the insulating spindle 1 to form the assembly 10.

[0038] S2. During assembly, the upper contact assembly 2 and the clamp 6 are fixed and wrapped around the outside of the insulating spindle 1 by the clamping screw 11 (clamped around the outside of the insulating spindle 1). Then, the fastening screw 4 passes through the mounting hole on the upper contact assembly 2 and the through hole 7 of the insulating spindle 1 in sequence and is threaded into the corresponding threaded hole 12 of the clamping plate 3 to fix the upper contact assembly 2 outside the insulating spindle 1. The fastening screw 4 has a positioning function and restricts the upper contact assembly 2 from rotating along the tangential direction of the outer diameter of the insulating spindle 1 during the tap changer switching process.

[0039] S3. The lower contact assembly 5 and the clamp 6 are fixed and wrapped around the outside of the insulating spindle 1 by another set of clamping screws 11 (clamped around the outside of the insulating spindle 1). Then, the fastening screws 4 are threaded through the mounting holes on the lower contact assembly 5 and the through holes 7 of the insulating spindle 1, and then threaded into the corresponding threaded holes of the clamping plate 3 to fix the lower contact assembly 5 outside the insulating spindle 1. Here, the fastening screws 4 also play a positioning role, restricting the lower contact assembly 5 from rotating along the tangential direction of the outer diameter of the insulating spindle 1 during the tap changer switching process.

[0040] The above steps complete the assembly of contact group 5 and insulating spindle 1. The entire assembly process eliminates the need for drilling, improves the working environment, ensures the health of workers, and increases work efficiency. It also eliminates the need to machine threads on the insulating spindle, making the contact group fixing method more reliable, ensuring the quality of the tap changer, and enhancing market competitiveness.

[0041] Other aspects of this invention that are not detailed herein are all conventional techniques known to those skilled in the art.

[0042] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] The scope of protection of this invention is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this invention shall fall within the scope of protection of this invention.

Claims

1. A contact assembly fastening structure for an on-load tap changer, comprising a hollow cylindrical insulating spindle, a contact assembly, and a clamp; the contact assembly and the clamp are connected by multiple clamping screws to form an assembly surrounding the insulating spindle; characterized in that: Each assembly has at least one clamping plate inside the insulated spindle, and each clamping plate has multiple threaded holes. On the side wall of the insulated spindle, opposite each clamping plate's threaded hole, there are multiple through holes and multiple countersunk holes, each communicating one-to-one with a threaded hole. A connecting screw is installed in each countersunk hole, passing through the countersunk hole and threaded into the corresponding threaded hole on the clamping plate, eliminating the need for machining threads on the insulated spindle. Each assembly has multiple mounting holes that communicate one-to-one with the through holes on the insulated spindle, and a fastening screw is installed in each mounting hole. The fastening screw passes through the mounting hole and the through hole connected to it, then threaded into the corresponding threaded hole on the clamping plate.

2. The contact assembly fastening structure for an on-load tap changer according to claim 1, characterized in that: The contact group includes an upper contact group and a lower contact group. There are two clamps. One clamp is connected to the upper contact group by a set of clamping screws to form a ring and then surrounds the outside of the insulating main shaft. The other clamp is connected to the lower contact group by another set of clamping screws to form a ring and then surrounds the outside of the insulating main shaft.

3. The contact assembly fastening structure for an on-load tap changer according to claim 2, characterized in that: The mounting holes are respectively located at both ends of the upper contact group and both ends of the lower contact group.

4. The contact assembly fastening structure for an on-load tap changer according to claim 3, characterized in that: The clamping plates consist of two pieces, one of which is attached to the inner side of the insulating spindle, facing the upper contact group, and the other is attached to the inner side of the insulating spindle, facing the lower contact group.

5. The contact assembly fastening structure for an on-load tap changer according to claim 4, characterized in that: Each clamping plate on the insulated spindle has two through holes and two countersunk holes, and correspondingly, each clamping plate has four threaded holes.

6. The contact assembly fastening structure for an on-load tap changer according to claim 5, characterized in that: Two countersunk holes are placed between two through holes.

7. The contact assembly fastening structure for an on-load tap changer according to claim 1, characterized in that: The clamping plate is arc-shaped and fits against the inner wall of the insulated spindle.

8. The contact assembly fastening structure for an on-load tap changer according to claim 7, characterized in that: The clamping plate is a metal plate.

9. The assembly method of the contact group fastening structure for an on-load tap changer as described in any one of claims 1-8, comprising the following steps: S1. Fix the clamping plate to the inside of the insulated spindle to form an assembly; wherein... The connecting screw passes through the countersunk hole on the insulating spindle and is threaded into the corresponding threaded hole in the clamping plate, thus fixing the clamping plate inside the insulating spindle and eliminating the need to machine threads on the insulating spindle. S2. Fix the upper contact assembly and clamp with clamping screws and wrap them around the outside of the insulating spindle. Then, use fastening screws to pass through the mounting holes on the upper contact assembly and the through holes of the insulating spindle in sequence, and then thread them into the corresponding threaded holes in the clamping plate. S3. Fix the lower contact assembly and clamp to the outside of the insulating spindle with another set of clamping screws, and then use fastening screws to pass through the mounting holes on the lower contact assembly and the through holes of the insulating spindle in sequence, and then thread them into the corresponding threaded holes in the clamping plate.

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