Current transformer primary terminal welding tool

Abstract

The utility model discloses a current transformer primary terminal welding frock for fixing the first and second connecting terminals of the upper and lower ends of the electrically conductive rod when welding, which comprises a base, an upper fixing seat, a lower fixing seat, a first fixing member and a second fixing member; the base is provided with a positioning table and a support, and the support is arranged on the side edge of the positioning table; the upper fixing seat is detachably installed on the side of the support, and the height of the upper fixing seat is adjustable; the side of the upper fixing seat is provided with an upper positioning groove for the cooperation of the end of the second connecting terminal; the upper positioning groove extends along the vertical direction, and the lower end is provided with a limiting flange; the lower fixing seat is detachably installed on the upper surface of the positioning table and is located below the upper fixing seat; the upper surface of the lower fixing seat is provided with a lower positioning groove for the cooperation of the end of the second connecting terminal, and the lower positioning groove extends along the horizontal direction, and both ends are open; a plurality of first and second fixing members are respectively arranged in the upper positioning groove and the lower positioning groove, and are respectively used for fixing the end of the first and second connecting terminals.

Description

Technical Field

[0001] This utility model belongs to the field of current transformer technology, and specifically refers to a welding fixture for the primary terminals of a current transformer. Background Technology

[0002] A current transformer (CT) is an electrical device used for measurement and protection, widely applied in power systems. It enables the monitoring, control, and protection of power systems by proportionally converting high current into low current. Compared to the primary terminals of traditional current transformers, the irregularly shaped and large-volume current terminals undergo shrinkage and deformation during welding, resulting in mismatches between the terminals and the mold. During mold assembly, workers must force the terminals into the mold's positioning slots by hammering them, which generates significant stress and may cause the epoxy resin to crack, posing a substantial quality risk.

[0003] Specifically, refer to Figure 1 As shown, the target product includes a conductive rod 10 and its two ends, a first connecting terminal 20 and a second connecting terminal 30. In actual production, the first connecting terminal 20 and the second connecting terminal 30 are usually welded together with the two ends of the conductive rod 10. Since the connecting terminals are made of copper, they shrink after welding, resulting in the terminal spacing after welding not necessarily meeting production requirements. Therefore, the existing method cannot accurately position the relative position between the two connecting terminals of the current transformer, causing the connecting terminals to not be precisely matched with the mold during mold assembly. Employees need to painstakingly tap the connecting terminals to align them with the grooves in the mold before they can be installed in place. If they are not installed correctly, there is a risk of scrapping the product. Furthermore, even after forcibly tapping and placing them into the grooves, there will always be stress being released, affecting product performance and potentially causing problems such as cracking and partial discharge of the current transformer. Utility Model Content

[0004] The main purpose of this utility model is to provide a welding fixture for the primary terminals of a current transformer, which solves the problems existing in the prior art. It is used to assist in the positioning of the terminal ends when welding the conductive rod and the connecting terminal, and to ensure that the spacing between the terminal ends after welding meets the production requirements.

[0005] To achieve the above objectives, the solution of this utility model is:

[0006] A welding fixture for primary terminals of a current transformer is used to fix the first and second connecting terminals at the upper and lower ends of a conductive rod during welding. It includes a base, an upper fixing seat, a lower fixing seat, first fixing members, and second fixing members. The base is provided with a positioning platform and a bracket, the bracket being disposed on the side of the positioning platform. The upper fixing seat is detachably mounted on the side of the bracket, and its height is adjustable. The side of the upper fixing seat has an upper positioning groove for the end of the second connecting terminal to mate with. The upper positioning groove extends vertically and has a limiting flange at its lower end. The lower fixing seat is detachably mounted on the upper surface of the positioning platform and located below the upper fixing seat. The upper surface of the lower fixing seat has a lower positioning groove for the end of the second connecting terminal to mate with, the lower positioning groove extending horizontally and having open ends. The upper and lower positioning grooves each contain a plurality of first and second fixing members, respectively used to fix the ends of the first and second connecting terminals.

[0007] A first bend and a second bend are respectively provided between the two ends of the first connecting terminal and the second connecting terminal.

[0008] Preferably, the first turning portion and the second turning portion are bent in opposite directions.

[0009] The positioning platform is located at one end of the base, and the other end of the base is used to place the end of the second connecting terminal that is welded to the conductive rod.

[0010] Preferably, the lower positioning groove extends along the length direction of the base.

[0011] Preferably, the left and right sides of the end of the first connecting terminal are respectively clearance-fitted with the left and right sidewalls of the upper positioning groove, and the lower surface of its end is fitted onto the limiting flange by its own weight; the left and right sides of the end of the second connecting terminal are respectively clearance-fitted with the left and right sidewalls of the lower positioning groove.

[0012] The positioning platform and the bracket are respectively provided with a first mounting hole and a second mounting hole; the first mounting hole is a round hole; the second mounting hole is a waist hole extending along the vertical direction; the upper fixed seat and the lower fixed seat are respectively assembled with the second mounting hole and the first mounting hole by a number of screws.

[0013] The first fixing member passes through the upper fixing seat from the side of the upper fixing seat facing away from the conductive rod and locks into the end of the first connecting terminal; the second fixing member passes through the upper surface of the end of the second connecting terminal from the end of the second connecting terminal and locks into the lower fixing seat.

[0014] The first fastener is a common bolt; the second fastener is a special bolt, which includes a nut, a cylindrical part and a stud part integrally connected from top to bottom. The end of the second connecting terminal is provided with a through hole for the second fastener to pass through. The cylindrical part is clearance-fitted with the through hole, and the stud part is threadedly locked into the bottom wall of the lower positioning groove of the lower fixing seat.

[0015] After adopting the above technical solution, the present invention has the following technical effects:

[0016] Before welding, the non-welded ends of the first and second connecting terminals can be fixed in the upper and lower positioning grooves of the upper and lower fixing seats respectively using the first and second fixing components. This ensures that the distance between the two connecting terminals remains constant before and after welding, thereby achieving precise positioning of the relative position between the two connecting terminals using tooling. The overall product structure after welding can precisely fit with the mold, facilitating mold installation by employees, preventing stress and cracking of the transformer, and improving product qualification rate. Both the upper and lower fixing seats are detachable, and the height of the upper fixing seat is adjustable. It can replace fixing seats with different positioning groove widths and adjust the height of the upper fixing seat, thus adapting to connecting terminals of different ratios and conductive rods of different lengths, providing greater flexibility. Attached Figure Description

[0017] Figure 1 This is a product illustration.

[0018] Figure 2 Three-dimensional representation of a specific embodiment of this utility model Figure 1 .

[0019] Figure 3 Three-dimensional representation of a specific embodiment of this utility model Figure 2 .

[0020] Figure 4 This is an exploded view of a specific embodiment of the present utility model.

[0021] Figure 5 This is a schematic diagram illustrating the use of a specific embodiment of the present utility model.

[0022] Explanation of icon numbers:

[0023] 1-Base; 11-Positioning platform; 111-First mounting hole; 12-Bracket; 121-Second mounting hole;

[0024] 2-Upper fixed seat; 21-Upper positioning groove; 22-Limiting flange;

[0025] 3-Lower fixed seat; 31-Lower positioning groove;

[0026] 4-First fastener;

[0027] 5-Second fastener; 51-Nut; 52-Cylindrical portion; 53-Stud portion;

[0028] 10 - Conductive rod;

[0029] 20 - First connecting terminal; 201 - First bend;

[0030] 30 - Second connecting terminal; 301 - Second bend; 302 - Through hole. Detailed Implementation

[0031] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0032] refer to Figures 2-4 As shown, this utility model discloses a welding fixture for the primary terminals of a current transformer, used to fix the first connecting terminal 20 and the second connecting terminal 30 at the upper and lower ends of the conductive rod 10 during welding. It includes a base 1, an upper fixing seat 2, a lower fixing seat 3, a first fixing member 4, and a second fixing member 5.

[0033] The base 1 is provided with a positioning platform 11 and a bracket 12, with the bracket 12 located on the side of the positioning platform 11;

[0034] The upper fixing seat 2 is detachably mounted on the side of the bracket 12, and the height of the upper fixing seat 2 is adjustable; the side of the upper fixing seat 2 is provided with an upper positioning groove 21 for the end of the second connecting terminal 30 to engage; the upper positioning groove 21 extends along the vertical direction (i.e., the up and down direction), and its lower end is provided with a limiting flange 22.

[0035] The lower fixing seat 3 is detachably mounted on the upper surface of the positioning platform 11 and located below the upper fixing seat 2; the upper surface of the lower fixing seat 3 is provided with a lower positioning groove 31 for the end of the second connecting terminal 30 to engage, the lower positioning groove 31 extends in the horizontal direction and both ends are open.

[0036] Several first fixing members 4 and second fixing members 5 are respectively provided in the upper positioning groove 21 and the lower positioning groove 31, which are used to fix the ends of the first connecting terminal 20 and the second connecting terminal 30 respectively.

[0037] refer to Figure 5As shown, through the above scheme, before welding, the non-welded ends of the first connecting terminal 20 and the second connecting terminal 30 can be fixed in the upper positioning groove 21 and lower positioning groove 31 of the upper fixing seat 2 and the lower fixing seat 3, respectively, by the first fixing member 4 and the second fixing member 5. This ensures that the distance between the two connecting terminals remains unchanged before and after welding, thereby achieving precise positioning of the relative position relationship between the two connecting terminals using tooling. The overall product structure after welding can be precisely matched with the mold, facilitating mold installation by employees, preventing stress, and preventing the transformer from cracking, thus improving the product qualification rate. Both the upper fixing seat 2 and the lower fixing seat 3 are detachable and can be installed. The height of the upper fixing seat 2 is adjustable, allowing for replacement with fixing seats of different positioning groove widths and adjustment of the height of the upper fixing seat 2. This makes it suitable for connecting terminals of different ratios and conductive rods 10 of different lengths, providing greater flexibility.

[0038] The following are specific embodiments of the present invention.

[0039] A first bend 201 and a second bend 301 are respectively provided between the two ends of the first connecting terminal 20 and the second connecting terminal 30 to accommodate the deformation of the copper parts during the welding process, avoid stress accumulation, and ensure that the terminal spacing remains unchanged after the product is removed from the tooling.

[0040] Furthermore, the first turning part 201 and the second turning part 301 are bent in opposite directions.

[0041] The aforementioned positioning platform 11 is located at one end of the base 1, and the other end of the base 1 is used to lay the end of the second connecting terminal 30 that is welded to the conductive rod 10.

[0042] Furthermore, the aforementioned lower positioning groove 31 extends along the length direction of the base 1.

[0043] Secondly, the left and right sides of the ends of the first connecting terminal 20 respectively have clearance fits with the left and right sidewalls of the upper positioning groove 21, and its lower end surface is secured to the limiting flange 22 by its own weight; the left and right sides of the ends of the second connecting terminal 30 respectively have clearance fits with the left and right sidewalls of the lower positioning groove 31. This ensures that the ends of the first connecting terminal 20 and the second connecting terminal 30 will not wobble left and right after being placed in their respective positioning grooves. Therefore, when changing different mounting bases, a positioning groove matching the width of the end of the target connecting terminal can be selected.

[0044] The positioning platform 11 and the bracket 12 are respectively provided with a first mounting hole 111 and a second mounting hole 121; the first mounting hole 111 is a round hole; the second mounting hole 121 is a waist hole extending along the vertical direction; the upper fixed seat 2 and the lower fixed seat 3 are respectively assembled with the second mounting hole 121 and the first mounting hole 111 by a number of screws, so as to realize the detachable installation of the upper fixed seat 2 and the detachable installation of the lower fixed seat 3 and the height adjustment.

[0045] The first fixing member 4 is inserted into the upper fixing seat 2 from the side of the upper fixing seat 2 facing away from the conductive rod 10 and locked into the end of the first connecting terminal 20. The second fixing member 5 is inserted into the end of the second connecting terminal 30 from the upper surface of the end of the second connecting terminal 30 and locked into the lower fixing seat 3.

[0046] Furthermore, the first fixing member 4 is a common bolt; the second fixing member 5 is a special bolt, which includes a nut 51, a cylindrical part 52, and a stud part 53 integrally connected from top to bottom. The end of the second connecting terminal 30 is provided with a through hole 302 for the second fixing member 5 to pass through. The cylindrical part 52 is clearance-fitted with the through hole 302, and the stud part 53 is threadedly locked into the bottom wall of the lower positioning groove 31 of the lower fixing seat 3. Since the cylindrical part 52 and the through hole 302 are the same size, a clearance fit is achieved, which can prevent the second connecting terminal 30 from shaking in the extension direction of the lower positioning groove 31. Compared with locking with a common bolt, its positioning effect is more accurate (the end of the first connecting terminal 20 is limited by the limiting flange 22 in the downward direction, so a common bolt can be used).

[0047] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A welding fixture for primary terminals of a current transformer, used to fix the first connecting terminals and the second connecting terminals at the upper and lower ends of a conductive rod during welding, characterized in that: Includes a base, an upper fixing seat, a lower fixing seat, a first fixing component, and a second fixing component; The base is provided with a positioning platform and a bracket, and the bracket is located on the side of the positioning platform. The upper fixing seat is detachably mounted on the side of the bracket, and the height of the upper fixing seat is adjustable; the side of the upper fixing seat is provided with an upper positioning groove for the end of the second connecting terminal to engage; the upper positioning groove extends in the vertical direction, and its lower end is provided with a limiting flange; The lower fixing seat is detachably mounted on the upper surface of the positioning platform and located below the upper fixing seat; the upper surface of the lower fixing seat is provided with a lower positioning groove for the end of the second connecting terminal to engage, the lower positioning groove extends horizontally and has openings at both ends; The upper positioning groove and the lower positioning groove are respectively provided with a plurality of first fixing members and second fixing members, which are used to fix the ends of the first connecting terminal and the second connecting terminal respectively.

2. The welding fixture for the primary terminals of a current transformer as described in claim 1, characterized in that: A first bend and a second bend are respectively provided between the two ends of the first connecting terminal and the second connecting terminal.

3. The welding fixture for the primary terminals of a current transformer as described in claim 2, characterized in that: The first and second turning parts are bent in opposite directions.

4. The welding fixture for the primary terminals of a current transformer as described in claim 1, characterized in that: The positioning platform is located at one end of the base, and the other end of the base is used to place the end of the second connecting terminal that is welded to the conductive rod.

5. The welding fixture for the primary terminals of a current transformer as described in claim 4, characterized in that: The lower positioning groove extends along the length of the base.

6. The welding fixture for the primary terminals of a current transformer as described in claim 5, characterized in that: The left and right sides of the end of the first connecting terminal are respectively clearance-fitted with the left and right sidewalls of the upper positioning groove, and the lower surface of its end is fitted onto the limiting flange by its own weight; the left and right sides of the end of the second connecting terminal are respectively clearance-fitted with the left and right sidewalls of the lower positioning groove.

7. The welding fixture for the primary terminals of a current transformer as described in claim 1, characterized in that: The positioning platform and the bracket are respectively provided with a first mounting hole and a second mounting hole; the first mounting hole is a round hole; the second mounting hole is a waist hole extending along the vertical direction; the upper fixed seat and the lower fixed seat are respectively assembled with the second mounting hole and the first mounting hole by a number of screws.

8. The welding fixture for the primary terminals of a current transformer as described in claim 1, characterized in that: The first fixing member passes through the upper fixing seat from the side of the upper fixing seat facing away from the conductive rod and locks into the end of the first connecting terminal; the second fixing member passes through the upper surface of the end of the second connecting terminal from the end of the second connecting terminal and locks into the lower fixing seat.

9. The welding fixture for the primary terminals of a current transformer as described in claim 1, characterized in that: The first fastener is a common bolt; the second fastener is a special bolt, which includes a nut, a cylindrical part and a stud part integrally connected from top to bottom. The end of the second connecting terminal is provided with a through hole for the second fastener to pass through. The cylindrical part is clearance-fitted with the through hole, and the stud part is threadedly locked into the bottom wall of the lower positioning groove of the lower fixing seat.

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