Special tool for assembling rear plug of mutual inductor

Abstract

The utility model discloses a special tool for assembling a rear plug of a mutual inductor, which relates to the technical field of power equipment assembly and comprises a workbench base, a positioning plate, a supporting plate, a pressing rod, a guide rod, a spring and an ejector rod. The tool is hinged to the top end of the supporting plate through the pressing rod to form a lever structure, downward pressure is transmitted to the ejector rod through the guide rod and the spring, and the tail end arc-shaped face evenly presses the fixed check ring. The positioning plate and the supporting plate are adjustably connected through a bolt to adapt to rear plugs of different specifications. During assembly, the rear plug base and the silica gel head assembly are fixed to a workbench, the pressing rod presses downwards and rotates the base, and accurate embedding of the fixed check ring is achieved. According to the utility model, the labor intensity is reduced, the problems of poor consistency, poor sealing and the like of manual assembly are solved, and the device is suitable for large-scale production of gas insulated switchgear mutual inductors.

Description

Technical Field

[0001] This utility model relates to the field of voltage transformer rear plug installation and manufacturing, specifically to a special tool for assembling transformer rear plugs. Background Technology

[0002] With the development of the smart grid industry, smart grid construction has placed new demands on the miniaturization, high reliability, automation, and intelligence of switches. Currently, voltage transformers for gas-insulated switchgear are compact in structure and small in size, with a fully shielded metal surface. During operation, the outer surface is grounded to zero potential, unaffected by altitude pollution or any electric field interference, resulting in high operational stability. Furthermore, the products exhibit low partial discharge, meeting or exceeding national and IEC standards, and their technology is internationally leading. These transformers are widely used in key projects both domestically and internationally, including rail transit, oil and petrochemicals, steel smelting, offshore platforms, clean energy, and urban underground power stations. Their usage accounts for over 70% of the domestic market for this type. Due to technical requirements, voltage transformers for gas-insulated switchgear require an internal fuse followed by sealing with an insulating plug. The insulating plug is a core component of voltage transformers for gas-insulated switchgear. During production and assembly, the plug's special structure makes assembly complex, and traditional manual assembly is inefficient and inconsistent, easily leading to problems such as poor sealing or partial discharge. Existing technology lacks an efficient and reliable dedicated tool for this purpose, necessitating improvement. Summary of the Invention

[0003] This utility model provides a special tool for assembling the rear plug of a current transformer, aiming to solve the problems of low efficiency and poor consistency in manual assembly. This tool integrates components such as a pressure rod, a push rod, and a guide rod, combined with the lever principle and a positioning device, to achieve fast and precise assembly.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A special tool for assembling a rear plug of a current transformer includes: a workbench base for fixing assembly components; a positioning plate vertically installed on one side of the workbench base surface; a pressure rod hinged to the top of the support plate, applying downward pressure through a lever structure; a guide rod with an outer spring; one end of the guide rod connected to the pressure rod near the hinge point between the pressure rod and the positioning plate; the other end passing through the U-shaped opening in the middle of the positioning plate; the positioning plate holding the other end of the spring; the guide rod passing through the positioning plate vertically; the positioning plate connected to the support plate; a top rod connected to the pressure rod at its upper end; the end of the top rod having an arc-shaped contact surface for pressing and fixing a retaining ring; a rear plug base placed on the workbench base; a silicone head installed on the rear plug base; and a retaining ring installed in the positioning groove formed by the rear plug base and the silicone head.

[0005] Preferably, the cross-section of the support plate is U-shaped with an opening in the middle, the opening of the U-shape facing the positioning plate, and it is detachably connected by bolts.

[0006] Preferably, the guide rod is fitted with a U-shaped opening in the positioning plate to ensure that the guide rod can move freely in the vertical direction.

[0007] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) the manual operation intensity is reduced by lever structure and positioning device; (2) the guide rod and top rod work together to ensure assembly accuracy and consistency; (3) the adjustable design can be adapted to various specifications of components, improving tool versatility; (4) the assembly efficiency and product qualification rate are improved. Attached Figure Description

[0008] Figure 1 This is a front view of the special tool of this utility model;

[0009] Figure 2 This is a top view of the special tool of this utility model;

[0010] Figure 3 This is a schematic diagram of the rear plug base and silicone head assembly;

[0011] Figure 4 This is a diagram showing the process of assembling the plug onto the special workbench of this utility model.

[0012] The markings in the diagram are: 1-workbench base, 2-pressure rod, 3-spring, 4-positioning plate, 5-support plate, 6-top rod, 7-guide rod, 8-silicone head, 9-rear plug base, 10-fixing retaining ring. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0014] like Figure 1 and 2As shown: A special workbench for assembling the retaining ring of the rear plug of a current transformer. This special workbench is composed of a workbench base 1, a pressure rod 2, a spring 3, a positioning plate 4, a support plate 5, a top rod 6, a guide rod 7, a silicone head 8, a rear plug base 9, and a retaining ring 10. The workbench base 1 is used to fix the assembly components. The positioning plate 4 is vertically installed on one side of the workbench base 1. The pressure rod 2 is hinged to the top of the support plate 5 and applies downward pressure through a lever structure. The guide rod 7 is fitted with a spring 3, and one end of the guide rod 7 is connected to the pressure rod. The spring 3 is hinged near the pressure rod 2 and the positioning plate 4. The other end of the spring 3 passes through the U-shaped opening in the middle of the positioning plate 4. The positioning plate 4 holds the other end of the spring 3. The guide rod 7 can pass through the positioning plate 4 vertically. The positioning plate 4 is connected to the support plate 5. The upper end of the push rod 6 is connected to the pressure rod 2. The end of the push rod 6 has an arc-shaped contact surface for pressing the fixing retaining ring 10. The rear plug base 9 is placed on the workbench base 1. The silicone head is installed on the rear plug base 9. The fixing retaining ring 10 is installed in the positioning groove formed by the rear plug base 9 and the silicone head. The support plate 5 has a U-shaped cross-section with a central opening. The U-shaped opening faces the positioning plate 4 and is detachably connected by bolts. The guide rod 7 is clearance-fitted with the U-shaped opening of the positioning plate 4 to ensure free vertical movement of the guide rod 7.

[0015] like Figure 3 As shown: the rear plug base 9 and silicone head 8 are assembled into a combination piece in the early stage;

[0016] like Figure 4 As shown, during implementation: 1. Clean the rear plug base 9 and silicone head 8 and place them flat on a dust-free workbench, ensuring the surfaces are free of oil or impurities to avoid affecting the sealing performance. Align the protruding part of the silicone head 8 with the groove of the rear plug base 9, and gently press or tap evenly with a rubber mallet to make the silicone head 8 fully embedded in the positioning groove of the base 9. Pre-assemble the rear plug base 9 and silicone head 8 into a combined assembly. Figure 3 );

[0017] 2. Place the assembly on the workbench base 1, and place the retaining ring 10 in the positioning groove;

[0018] 3. The operator holds the end of the pressure rod 2 and applies downward pressure. The force is amplified by the lever fulcrum hinged to the top of the support plate 5, causing the push rod 6 to move downward. The push rod 6 contacts the fixed retaining ring 10 through its arc surface. At the same time, the operator manually rotates the rear plug base 9 to press the fixed retaining ring 10 evenly into the groove.

[0019] 4. Slowly release the pressure rod 2, the spring 3 pushes the guide rod 7 to return to its original position, and the top rod 6 disengages from the fixed retaining ring 10, thus completing the assembly.

[0020] The advantages of this utility model's special tool are: (1) it reduces the intensity of manual operation through the lever structure and positioning device; (2) the guide rod and top rod work together to ensure assembly accuracy and consistency; (3) the adjustable design adapts to various specifications of components, improving the tool's versatility; and (4) it improves assembly efficiency and product qualification rate.

[0021] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A special tool for assembling the rear plug of a current transformer, characterized in that, include: A workbench base (1) is used to fix assembly components; a positioning plate (4) is vertically installed on one side of the workbench base (1); a pressure rod (2) is hinged to the top of a support plate (5) and applies downward pressure through a lever structure; a guide rod (7) is fitted with a spring (3); one end of the guide rod (7) is connected to the hinge point of the pressure rod (2) near the pressure rod (2) and the positioning plate (4), and the other end passes through the U-shaped opening in the middle of the positioning plate (4); the positioning plate (4) holds the spring (3). At the other end, the guide rod (7) can pass through the positioning plate (4) from top to bottom. The positioning plate (4) is connected to the support plate (5). The upper end of the top rod (6) is connected to the pressure rod (2). The end of the top rod (6) is provided with an arc-shaped contact surface for pressing the fixing ring (10). The rear plug base (9) is placed on the workbench base (1). The silicone head is installed on the rear plug base (9). The fixing ring (10) is installed in the positioning groove formed by the rear plug base (9) and the silicone head.

2. The special tool according to claim 1, characterized in that, The cross-section of the support plate (5) is U-shaped with an opening in the middle, the opening of the U-shape facing the positioning plate (4), and is detachably connected by bolts.

3. The special tool according to claim 1, characterized in that, The guide rod (7) and the positioning plate (4) are fitted with a U-shaped opening to ensure that the guide rod (7) can move freely in the vertical direction.

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