CN203831354U - Spiral spring replacing tool - Google Patents

Abstract

The utility model discloses a helical spring replacement tool, which comprises: two clamping plates, four bolts and four nuts; a U-shaped cutout is opened on the clamping plate, one side of which has a U-shaped concave part, and the other side It has a half U-shaped depression, and the half U-shaped depression is located in the middle of the U-shaped cutout, and one end has a stop surface; the U-shaped cutout is embedded in the gap between the spring wires at both ends of the coil spring, and the U-shaped depression and the half U-shaped depression The bottom surface is against the spring wire, and the stop surface is against the end surface of the spring wire. The free ends of the four bolts respectively pass through the four through holes of the two clamping plates, and pass through the nuts on the free ends of each bolt. Screwing in forces the coil spring to compress. The two clamping plates of the helical spring replacement tool of the utility model are continuously approached by screwing in the nut, forcing the helical spring in the shrinking state to continue shrinking until the two ends of the helical spring break away from the blocking structure. At this time, the helical spring replacement tool and The coil spring can be safely and easily removed from the installation structure together.

Description

A coil spring replacement tool

technical field

The utility model relates to a spring replacement tool, in particular to a coil spring replacement tool.

Background technique

As a kind of elastic connector, spring is widely used in industry and daily life. Some springs with a large elastic coefficient (the larger the elastic coefficient, the smaller the compression or elongation per unit force, that is, the greater the elastic force) is inconvenient to disassemble and replace. For example, the main gate of the GW7 type disconnector is usually installed at a high place. Figure 1 shows the internal structure of the main gate of the GW7 type disconnector. A static contact 2 is installed inside the rectangular box, and the static contact passes through the piston rod 4 in the cylinder. The axial movement of the body 3 is connected with the side wall of the box body, the fixed contact 2 is connected with the free end of the cylinder body 3 with the pin shaft 5, and the free end of the box body and the piston rod 4 is connected with the pin shaft 5 with rotation. A helical spring 1 with a large elastic coefficient is installed on the cylinder body 3, so as to press the static contact 2 tightly through the helical spring 1, and the helical spring 1 is in a compressed state at this time. There are usually two ways to replace the coil spring 1. One is to directly remove the pin shaft 5 connecting the static contact 2 and the cylinder body 3. The other is to use a crowbar, insert the crowbar into the gap between the spring wires of the coil spring 1, and then forcefully pry the coil spring 1 to shrink it. The defect of this method is that the box Due to the limitations of the body structure, it is impossible to find a stable fulcrum, and the space for operation is small. Since it belongs to high-altitude operations, if the crowbar is used to pry the air, the staff will be in danger of falling from a high altitude. Therefore, how to safely and quickly replace the coil spring similar to the main gate structure of the GW7 type disconnector is an urgent problem to be solved by those skilled in the art.

Utility model content

Aiming at the defects existing in the prior art in the process of replacing a coil spring with a large elastic coefficient, the utility model provides a coil spring replacement tool with a simple structure, which can safely and quickly replace a coil spring with a large elastic coefficient. coil spring.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a coil spring replacement tool, comprising: two oppositely arranged clamping plates, four bolts and four nuts; There is a U-shaped cutout, and the opposite side of the two clamping plates has a U-shaped recess formed along the outer edge of the U-shaped cutout, and the other side has a U-shaped recess formed along the outer edge of the U-shaped cutout. The half U-shaped recess formed from one end of the U-shaped notch on the opening side to the middle of the U-shaped notch, and a stop surface is formed at one end of the half U-shaped recess located in the middle of the U-shaped notch; The U-shaped cutouts of the clamping plate are respectively embedded in the gaps between the spring wires at both ends of the coil spring, the U-shaped recessed part and the half U-shaped recessed part are against the spring wires, and The end face of the end of the spring wire abuts against the stop surface, and the two clamping plates are respectively provided with four through holes on the outside of the U-shaped cutout, and the free ends of the four bolts correspond to The helical springs are forced to compress by screwing in the four through holes of the two clamping plates and by the nuts provided on the free ends of each bolt.

Preferably, the bolts are hexagonal bolts, and the four through holes of the clamping plate are located on the penetration side of the bolts, and are provided with hexagonal stopper holes for preventing the rotation of the hexagonal bolts.

Preferably, the U-shaped cutout is provided with a chamfer on one side of the U-shaped recessed part.

Compared with the prior art, the beneficial effects of the coil spring replacement tool of the present utility model are:

The U-shaped cutouts of the two clamping plates are respectively embedded in the spring wire gaps at both ends of the coil spring. Four bolts and four nuts connect the two clamping plates. By continuously screwing in the nuts, the two clamping plates are forced to approach each other continuously. The bottom surfaces of the U-shaped recesses of the two clamping plates are tightly pressed against the spring wire, which drives the contracted coil spring to continue to contract until the two ends of the coil spring are separated from the blocking structure that makes it contracted. At this time, the coil spring can be replaced with a tool Together with the coil spring, it can be safely and conveniently removed from the installation structure; in order to prevent the coil spring from rotating when the two clamping plates drive the coil spring to shrink, the stop surface formed at the end of the half U-shaped recess and the end of the spring wire The end faces of the springs are tightly abutted, and the stop faces can effectively prevent the rotation of the coil spring itself, increasing the stability of the operation. Therefore, compared with the method of directly disassembling and replacing or replacing by crowbars in the prior art, using the coil spring replacement tool can safely and quickly replace the coil spring with a large elastic coefficient.

Description of drawings

Figure 1 is a schematic diagram of the internal structure of the main gate of the existing GW7 type disconnector;

Fig. 2 is a structural schematic diagram of one side of the clamping plate of the coil spring replacement tool of the present invention;

Fig. 3 is a schematic structural view of the other side of the clamping plate of the coil spring replacement tool of the present invention;

Fig. 4 is a schematic diagram of the use state of the coil spring replacement tool of the present invention for replacing the coil spring.

Detailed ways

In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 2-3, an embodiment of the present utility model discloses a coil spring replacement tool, including: two opposite clamping plates 6, four bolts 7 and four nuts 8; Plates 6 are provided with U-shaped cutouts 67, and the opposite sides of the two clamping plates 6 have U-shaped recesses 61 formed along the outer edges of the U-shaped cutouts 67, and the other side has U-shaped recesses 61 formed along the U-shaped cutouts. The outer edge of 67 forms a half U-shaped recess 64 from one end of the U-shaped notch 67 on the opening side to the middle of the U-shaped notch 67, and the half U-shaped recess 64 is formed with a stop at one end of the U-shaped notch 67 middle. surface 66; the U-shaped cutouts 67 of the two clamping plates 6 are respectively embedded in the gaps between the spring wires at both ends of the coil spring 1, and the U-shaped recessed part 61 and half of the U-shaped recessed part 64 respectively abut against the spring wires, and the springs The end surface of the end of the wire abuts against the stop surface 66, and the two clamping plates 6 are respectively provided with four through holes 62 on the outer sides of the U-shaped cutout 67, and the free ends of the four bolts 7 are respectively passed through. The four through holes 62 of the two clamping plates 6 force the coil spring 1 to compress by screwing in the nut 8 arranged on the free end of each bolt 7 . The two clamping plates 6 are all made of steel plates, and the thickness of the steel plate, the depth of the U-shaped recess 61 and half of the U-shaped recess 64 are determined by the radius and helix angle of the spring wire of the clamped coil spring 1, The depth of U-shaped recessed portion 61 and half U-shaped recessed portion 64 is preferably greater than the radius of spring wire, so that spring wire can be better embedded in U-shaped recessed portion 61 and half U-shaped recessed portion 64, and half The stop surface 66 at the end of the U-shaped recess 64 can abut against most of the round surface of the end surface of the spring wire end. In the case of a certain spring wire diameter, the larger the helical spring 1 with the larger lift angle, the larger the gap between the spring wires. In order to prevent the clamping plate 6 from shaking during clamping, the clamping plate 6 needs to adopt a thicker steel plate.

Referring to Fig. 4 and continuing to refer to Fig. 2-3, when using the helical spring replacement tool of the present utility model to replace the helical spring 1, the U-shaped cutouts 67 of the two clamping plates 6 are first inserted into the spring wire gaps at both ends of the helical spring 1 respectively In the middle, the spring wires on both sides of the gap are respectively abutted against the U-shaped recessed part 61 and half of the U-shaped recessed part 64, and the two clamping plates 6 are connected by four bolts 7 and four nuts 8. By continuously screwing in the nuts 8 , the two clamping plates 6 are forced to keep approaching, and the U-shaped recesses 61 of the two clamping plates 6 are pressed against the spring wire, which drives the contracted coil spring 1 to continue to contract until both ends of the coil spring 1 are detached so that it is contracted At this time, the coil spring replacement tool and the coil spring 1 can be safely and conveniently taken out from the installation structure; in order to prevent the two clamping plates 6 from driving the coil spring 1 to shrink, the coil spring 1 itself rotates The stop surface 66 formed at the end of the half U-shaped recess 64 is in close contact with the end surface of the end of the spring wire. The stop surface 66 can effectively prevent the rotation of the coil spring 1 itself, increasing the stability of the operation. Therefore, compared with the methods of direct disassembly and replacement or replacement by crowbar in the prior art, the coil spring 1 with a larger elastic coefficient can be safely and quickly replaced by using the coil spring replacement tool.

It should be understood that the scope of use of the helical spring replacement tool of the present invention is limited by its structural features and principles, and it cannot be considered only suitable for replacing the helical spring in the main gate of the GW7 type isolating switch.

In order to prevent the bolt 7 from rotating together with the nut 8 during the nut tightening process, the bolt 7 is selected from a hexagonal bolt, and a hexagonal stop sink is provided on the four through holes 62 on the insertion side of the bolt 7 of one of the clamping plates 6. The hole 65 prevents the bolt 7 from rotating together with the nut 8 by restricting the rotation of the bolt cap of the hexagon bolt.

In order to smoothly insert the U-shaped notch 67 into the gap between the spring wires at both ends of the coil spring 1 and increase the operability of the coil spring 1 for tool replacement, a chamfer 63 is provided on one side of the U-shaped recess 61 of the U-shaped notch 67 .

Claims (3)

1. A helical spring replacement tool is characterized in that, comprising: two oppositely arranged clamping plates, four bolts and four nuts; each said clamping plate is provided with a U-shaped cut, and the two clamping plates The opposite side of the clamping plate has a U-shaped recess formed along the outer edge of the U-shaped cutout, and the other side has an end located on the opening side from the U-shaped cutout along the outer edge of the U-shaped cutout. To the half U-shaped recess formed in the middle of the U-shaped incision, one end of the half U-shaped recess located in the middle of the U-shaped incision forms a stop surface; the two clamping plates The U-shaped cutouts are respectively embedded in the gaps between the spring wires at both ends of the coil spring, the U-shaped recessed part and the half U-shaped recessed part are against the spring wire, and the end faces of the ends of the spring wire are in contact with the spring wire. The stop surface is abutted against, and the two clamping plates are respectively provided with four through holes on the outside of the U-shaped cutout, and the free ends of the four bolts respectively pass through the two clamping plates The four through-holes of the bolts, and the coil springs are forced to compress by screwing in the nuts arranged on the free ends of each bolt. 2. The coil spring replacement tool according to claim 1, wherein the bolts are hexagonal bolts, and the four through holes of the clamping plate are located on the penetration side of the bolts to prevent the hexagonal bolts from Turning hexagon stop counterbore. 3 . The coil spring replacement tool according to claim 1 , wherein the U-shaped cutout is provided with a chamfer on one side of the U-shaped recessed part. 4 .