A moving contact assembly tool

Abstract

This invention relates to a moving contact assembly fixture, comprising a positioning block with positioning holes for accommodating two pairs of contact pieces of the moving contact during assembly. The positioning holes have two parallel, opposing front and rear positioning hole walls, with a distance between them adapted to the thickness of the paired contact pieces of the moving contact. During assembly, the paired contact pieces are limited in the thickness direction, ensuring proper contact and reliably constraining their front-to-back position, facilitating subsequent installation. The positioning block also has an upper positioning surface, which is at a predetermined distance from the bottom of the positioning hole. This ensures that when the bracket is installed onto the two pairs of contact pieces from top to bottom, the lower side of the bracket is stopped by the upper positioning surface, placing the bracket precisely in the designed position, facilitating the insertion of the locking pin and simplifying the assembly of the moving contact.

Description

Technical Field

[0001] This invention relates to a moving contact assembly fixture. Background Technology

[0002] Currently, a common moving contact structure used in low-voltage withdrawable switchgear and control equipment is as follows: Figure 1 and Figure 2 The movable contact includes a first pair of contact pieces 3 and a second pair of contact pieces 4. At least one contact piece in each pair has a recess 9 punched into one side to form a protrusion 8 on the other side. The two contact pieces in each pair make contact through the protrusion 8, simultaneously forming a heat dissipation gap. Each pair of contact pieces is provided with a spring piece 5, with both ends of the spring piece 5 resting against the shoulders at the upper and lower ends of each pair of contact pieces. This movable contact also includes a bracket 6 sleeved around the two pairs of contact pieces. The bracket 6 also sleeves around the spring piece 5, causing the spring piece 5 to deform to ensure the contact pressure during use. After the bracket 6 is sleeved around the spring piece, the pin hole on the bracket 6 needs to correspond to the through hole formed by the two pairs of contact pieces, and then the pin 7 needs to be pressed into the pin hole of the bracket 6. Currently, the assembly method for this type of movable contact in the prior art is purely manual assembly. Due to the large number and small size of the parts in this movable contact, manual assembly is very difficult. Summary of the Invention

[0003] The purpose of this invention is to provide a moving contact assembly fixture to solve the problem of difficult moving contact assembly in the prior art.

[0004] To achieve the above objectives, the technical solution of the moving contact assembly fixture of the present invention is as follows:

[0005] A moving contact assembly fixture, comprising:

[0006] Positioning block;

[0007] The positioning holes, formed on the positioning block, are used to accommodate two pairs of contact pieces of the moving contact. They have two parallel and opposite front and rear positioning hole walls, and the distance between the two front and rear positioning hole walls is adapted to the thickness of the pair of contact pieces of the moving contact, so as to limit the pair of contact pieces in the thickness direction.

[0008] The positioning hole is a through hole, and the positioning block also has an upper positioning surface. The upper positioning surface is at a set distance from the bottom of the positioning hole so that when the bracket is installed on the two pairs of contact pieces from top to bottom, the bracket is positioned in the vertical direction by the upper positioning surface.

[0009] Alternatively, the positioning hole is a blind hole, and the positioning block has an upper positioning surface. The upper positioning surface is a set distance from the bottom of the blind hole so that when the bracket is installed on the two pairs of contact pieces from top to bottom, the bracket is positioned in the vertical direction by the upper positioning surface.

[0010] The beneficial effects of this invention are: in use, the front and rear positioning hole walls limit the two pairs of contact pieces of the moving contact in the front and rear directions, ensuring that the pairs of contact pieces are in contact and reliably constraining the front and rear positions of the contact pieces, which facilitates subsequent installation; by setting the distance between the upper positioning surface and the lowest end of the positioning hole, when the bracket is installed on the two pairs of contact pieces from top to bottom, the lower side of the bracket is blocked by the upper positioning surface, and the bracket is exactly in the designed position, which facilitates the insertion of the locking pin.

[0011] Furthermore, the left and right ends of the front and rear positioning hole walls are respectively provided with left and right positioning surfaces perpendicular to the front and rear positioning hole walls. The left and right positioning surfaces are used to position the spring in the left and right directions. Setting the left and right positioning surfaces can limit the range of motion of the spring in the left and right directions, which facilitates the subsequent installation of the bracket.

[0012] Furthermore, the positioning hole includes a rectangular central hole and rectangular end holes at both ends of the central hole. The central and end holes are perpendicular in their length directions to form a dumbbell-shaped positioning hole. The hole walls corresponding to the two long sides of the central hole constitute the front and rear positioning hole walls, and the hole walls of the end holes that are perpendicular to the front and rear positioning hole walls constitute the left and right positioning surfaces. The dumbbell-shaped elongated hole is designed because the front-to-back dimensions of the spring are generally larger than those of the paired contact pieces. This design provides sufficient space for the spring to be inserted into the rectangular end holes at both ends. By using the hole walls of the end holes that are perpendicular to the front and rear positioning hole walls as the left and right positioning surfaces, the left-to-right movement of the spring is restricted to the smaller width range of the rectangular end holes, facilitating the mounting of the bracket.

[0013] Furthermore, the positioning block has a recessed groove at the upper end of the positioning hole that communicates with the positioning hole. The left and right ends of the recessed groove extend beyond the rectangular end hole in the left and right directions to accommodate the bracket. The bottom of the recessed groove forms the upper positioning surface. This design not only allows the upper positioning surface formed by the bottom of the recessed groove to position the bracket in the vertical direction, but also uses the groove wall to constrain the movement of the bracket in the front-back and left-right directions, facilitating the insertion of the locking pin.

[0014] Furthermore, the recess is rectangular, and its dimensions in the front-to-back direction are equal to the length of the rectangular end hole. The rectangular recess is easy to manufacture, and the fact that its dimensions in the front-to-back direction are equal to the length of the rectangular end hole ensures that the upper ends of the positioning hole walls have end faces that support and position the bracket, thereby increasing the support and positioning range of the upper positioning surface. Once the bracket is installed, its position is stable.

[0015] For positioning holes that are not dumbbell-shaped, but rectangular, the positioning block has a groove at the upper end of the positioning hole that communicates with the positioning hole. The left and right ends of the groove extend beyond the two ends of the positioning hole in the left and right directions to accommodate the bracket. The bottom of the groove forms the upper positioning surface. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a moving contact in the prior art;

[0017] Figure 2 yes Figure 1 The left view;

[0018] Figure 3 This is a top view of the moving contact assembly fixture of Embodiment 1 of the present invention;

[0019] Figure 4 yes Figure 1 Schematic diagram of the positioning hole in the middle;

[0020] Figure 5 yes Figure 3 Sectional view of AA;

[0021] Figure 6 This is a schematic diagram of two pairs of contact plates being inserted into the fixture;

[0022] Figure 7 This is a schematic diagram of the reed being installed on two pairs of contact plates;

[0023] Figure 8 This is a schematic diagram of the bracket being fitted onto two pairs of contact plates;

[0024] In the diagram: 1-sink, 11-upper positioning surface, 2-positioning hole, 21-rectangular middle hole, 22-rectangular end hole, 3-first pair of contact pieces, 4-second pair of contact pieces, 5-spring, 6-bracket, 7-pin, 8-protrusion, 9-recess. Detailed Implementation

[0025] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0026] A specific embodiment of the moving contact assembly fixture of the present invention is as follows: Figures 3 to 5 As shown, the moving contact assembly fixture includes a positioning block with positioning holes 2. The distance between the front and rear walls of the positioning hole 2 is adapted to the thickness of each pair of contacts in the front-rear direction to form the front and rear positioning hole walls, so as to ensure that the first pair of contacts 3 and the second pair of contacts 4 can be limited in the front-rear direction by the front and rear positioning hole walls after being inserted into the positioning hole 2, which facilitates the installation of other parts of the moving contact.

[0027] In this embodiment, the specific structure of the positioning hole 2 is shown in the following figure. Figure 4The positioning hole 2 includes a rectangular central hole 21 and rectangular end holes 22 at both ends of the central hole. The length directions of the rectangular central hole 21 and the rectangular end holes 22 are perpendicular to each other, forming a dumbbell-shaped positioning hole 2. This design takes into account that the front-to-back dimension of the spring 5 is generally larger than the front-to-back thickness of the paired contact pieces. The length direction of the rectangular end holes 22 being perpendicular to the length direction of the rectangular central hole 21 easily accommodates the insertion of the spring, facilitating the installation of the spring. Furthermore, with this design, after the spring 5 is installed, the range of motion of the spring 5 in the left-to-right direction is restricted to the relatively small width range of the rectangular end holes 22. The left and right walls of the rectangular end holes 22 constitute the left and right positioning surfaces that restrict the left-to-right movement range of the spring 5. With the left-to-right movement of the spring 5 restricted to a small range, it is convenient to install the bracket 6.

[0028] In this embodiment, the positioning block also has an upper positioning surface 11, as detailed below. Figure 3 and Figure 5 The upper end of the positioning hole 2 is provided with a recess 1 that communicates with the positioning hole 2. The recess 1 is rectangular, and its front-to-back dimension is equal to the length of the rectangular end hole. This ensures that the installation of the spring 5 is not affected and that the machining work is not increased excessively. The two ends of the recess 1 extend beyond the rectangular end hole 22 in the left-to-right direction to accommodate the bracket 6. The bottom of the recess 1 forms the upper positioning surface 11, which consists of four parts, including two parts that extend beyond the length of the middle hole in the front-to-back direction and two parts that extend beyond the rectangular end hole in the left-to-right direction. This provides support and positioning for the bracket 6 in the front-to-back, left-to-right, and right-to-right directions. After the bracket 6 is installed, its position is stable. Furthermore, the structure of the recess 1 can constrain the movement of the bracket 6 in the front-to-back, left-to-right, and right-to-right directions with the help of the recess wall, making it convenient to press in the locking pin.

[0029] In this embodiment, the distance from the upper positioning surface 11 to the lower side of the positioning block is set so that when the lower end of the bracket 6 is engaged with the upper positioning surface 11, the buckle hole on the bracket 6 can be aligned with the through hole formed by the two pairs of contact pieces, which facilitates the insertion of the buckle.

[0030] When using the moving contact assembly fixture in this embodiment, such as Figure 6 As shown, after the two contact pieces of each pair are joined together, they are inserted into the positioning hole 2. The lower ends of the two pairs of contact pieces directly stop on the workbench surface and are flush with the bottom of the positioning block. The front and rear positioning hole walls of the positioning hole 2 limit the two pairs of contact pieces in the front-back direction, ensuring that the two contact pieces in each pair of contacts will not separate from each other, facilitating subsequent assembly; after the two pairs of contact pieces are inserted into the positioning hole 2, as... Figure 7As shown, the spring 5 is inserted into the rectangular end hole 22. The two ends of the spring 5 rest against the upper and lower shoulders of each pair of contacts. At this time, the range of motion of the spring 5 is limited by the left and right positioning surfaces, preventing it from completely disengaging from the upper and lower shoulders of each pair of contacts, thus facilitating the mounting of the bracket. Then, the bracket 6 is mounted around the two pairs of contacts, as shown in the reference diagram. Figure 8 The spring 5 is also fitted into the bracket 6. After being fitted, the bracket 6 forces the spring 5 to deform, thus increasing the contact pressure when the moving contact is used. After the bracket 6 is installed in place, the two pairs of contact pieces and the retaining spring 5 with the bracket 6 attached are removed from the fixture. Since the spring 5 has been deformed, the locking pin hole on the bracket 6 can be aligned with the through hole formed by the two pairs of contact pieces. After removal, the locking pin is pressed in to obtain a complete moving contact. This method of removing and then installing the locking pin avoids interference from the fixture when pressing in the locking pin, making the operation convenient. Of course, the locking pin can also be pressed in directly after the bracket is installed in place, and then the complete moving contact can be removed.

[0031] The difference between Embodiment 2 and Embodiment 1 of the moving contact assembly fixture of the present invention is that the positioning hole can be a blind hole. In this case, the distance from the upper positioning surface 11 to the bottom of the positioning hole is set so that when the lower end of the bracket is engaged with the upper positioning surface, the locking pin hole on the bracket 6 can be precisely aligned with the through hole formed by the two pairs of contact pieces, facilitating the insertion of the locking pin. This setting enables accurate positioning and assembly without the need for a worktable, which is very convenient.

[0032] The difference between Embodiment 3 and Embodiment 1 of the moving contact assembly fixture of the present invention is that no countersink is provided, and the upper side of the positioning block is directly used as the upper positioning surface, which can reduce the amount of processing and facilitate manufacturing.

[0033] The fourth embodiment of the moving contact assembly fixture of the present invention differs from the first embodiment in that the rectangular end hole 22 is replaced with an elliptical end hole. The major axis of the elliptical end hole is perpendicular to the length direction of the central hole 21 of the rectangle. This ensures that the major axis of the elliptical hole provides sufficient space for the installation of the spring, while the minor axis limits the lateral movement of the spring to a small range. Of course, in other embodiments, the end hole in the long direction can also be set to a circular, rhomboid, or other shapes.

[0034] In other embodiments, the positioning hole may also consist of only a rectangular hole, in which case the left and right ends of the sink extend beyond the ends of the rectangular hole in the left and right directions to accommodate the bracket, and the bottom of the sink forms the upper positioning surface.

Claims

1. A moving contact assembly fixture, characterized in that, include: Positioning block; The positioning holes, formed on the positioning block, are used to accommodate two pairs of contact pieces of the moving contact. They have two parallel and opposite front and rear positioning hole walls, and the distance between the two front and rear positioning hole walls is adapted to the thickness of the pair of contact pieces of the moving contact, so as to limit the pair of contact pieces in the thickness direction. The positioning hole is a through hole, and the positioning block also has an upper positioning surface. The upper positioning surface is at a set distance from the bottom of the positioning hole so that when the bracket is installed on the two pairs of contact pieces from top to bottom, the bracket is positioned in the vertical direction by the upper positioning surface. Alternatively, the positioning hole is a blind hole, and the positioning block has an upper positioning surface. The upper positioning surface is a set distance from the bottom of the blind hole so that when the bracket is installed on the two pairs of contact pieces from top to bottom, the bracket is positioned in the vertical direction by the upper positioning surface.

2. The moving contact assembly fixture according to claim 1, characterized in that, The left and right ends of the front and rear positioning hole walls are respectively provided with left and right positioning surfaces perpendicular to the front and rear positioning hole walls. The left and right positioning surfaces are used to position the spring in the left and right directions.

3. The moving contact assembly fixture according to claim 2, characterized in that, The positioning hole includes a rectangular central hole and rectangular end holes at both ends of the rectangular central hole. The rectangular central hole and the rectangular end holes are perpendicular in length direction to form a dumbbell-shaped positioning hole. The hole walls corresponding to the two long sides of the rectangular central hole constitute the front and rear positioning hole walls. The hole walls of the rectangular end holes that are perpendicular to the front and rear positioning hole walls constitute the left and right positioning surfaces.

4. The moving contact assembly fixture according to claim 3, characterized in that, The positioning block has a groove at the upper end of the positioning hole that communicates with the positioning hole. The left and right ends of the groove extend beyond the rectangular end hole in the left and right directions to accommodate the bracket. The bottom of the groove forms the upper positioning surface.

5. The moving contact assembly fixture according to claim 4, characterized in that, The settling tank is a rectangular tank, and the dimensions of the settling tank in the front-to-back direction are equal to the length of the rectangular end hole.

6. The moving contact assembly fixture according to claim 1 or 2, wherein the positioning block has a recessed groove communicating with the positioning hole at the upper end of the positioning hole, the left and right ends of the recessed groove extend beyond the two ends of the positioning hole in the left and right directions to accommodate the bracket, and the bottom of the recessed groove constitutes the upper positioning surface.

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