CN104999417A - Crank arm box seal ring assembly clamp - Google Patents

Abstract

The invention relates to a jig for assembling the sealing ring of a crank box, which includes a screw rod and a flange. The flange is arranged in the middle of a connecting sleeve. The diameter of the tapered through hole is large at the top and small at the bottom. A threaded sleeve is connected with the external thread on the upper part of the connecting sleeve. The upper end of the threaded sleeve is provided with a screw connecting sleeve. The threaded through hole, the screw rod is threadedly connected in the screw rod connecting sleeve, and the lower end of the screw rod passes through the threaded sleeve, and the lower end of the screw rod is connected with a pressure plate capable of passing through the smallest diameter end of the tapered through hole through a bearing. The purpose of the present invention is to provide a jig for assembling the sealing ring of the crank box, which has a simple structure and is easy to assemble. It can prevent the skeleton sealing ring from being worn or skewed during assembly, and ensure the assembly accuracy of the skeleton sealing ring; effectively improve the assembly qualification rate , to meet the dynamic sealing requirements.

Description

A jig for assembling the sealing ring of the crank box

technical field

The invention belongs to the field of assembling tools for a crank box, and in particular relates to a jig for assembling a sealing ring of a crank box.

Background technique

SF6 circuit breakers have been widely used in power systems, such as the common LW36-126 self-energy SF6 circuit breakers. Now many of them have reached the maintenance period. During the maintenance, it is necessary to disassemble the SF6 circuit breaker and replace the phase column. Arc extinguishing parts, the function of the crank box under the phase column of the circuit breaker is to transmit the output action of the operating mechanism from the outside to the insulating pull rod inside the phase column, and finally to the moving part unit of the arc extinguishing chamber to complete the circuit breaker. Opening and closing action. The crank box is fitted with a self-sealing valve for connection to the inflation line in the base. When the inflatable tube is not connected, the entire pole is in a sealed state. A positioning hole is designed on it, which can conveniently fix the pole in the opening position. The original seals of the disassembled crank box cannot continue to be used, and new seals must be replaced. The rotating shaft of the crank box meets the dynamic sealing requirements through a set of V-shaped seal rings and a set of skeleton seal rings, one of which is A set of V-rings is an auxiliary seal, and a set of skeleton seals is the main seal. Therefore, it is often necessary to replace the skeleton sealing ring with a new one during the maintenance process, but the assembly of the skeleton sealing ring has always been a difficult problem in the assembly of the crank box, because the outer ring of the skeleton sealing ring has a steel skeleton, and the outer surface is only a very thin layer Rubber has a large assembly interference, and it cannot be pressed in by hand, and the sealing ring will be damaged if it is knocked, and the glue on the steel frame will be damaged if it is slightly skewed. If there is no tooling in the assembly of the skeleton sealing ring, it is difficult to achieve a 10% assembly pass rate. In the prior art, there is also a tool for installing the gasket of the crank box, such as the patent No. CN201120488956.2, which discloses a tool for installing the gasket of the combined isolating switch crank box, which includes a flange with a threaded hole, and the outer surface is The externally threaded transmission rod passes through the threaded hole and is threadedly connected with the flange, and the upper part of the transmission rod is provided with a handle; the tool also includes a convex pressing block matched with the installation hole of the combined isolating switch crank box sealing gasket. But there are following defects in this utility model: the one, when assembling, sealing gasket is placed on the step of the bottom of pressing block, pushes pressing block downwards by transmission rod, and pressing block moves downward under force, and sealing gasket is pressed into In the installation hole of the gasket of the isolation switch crank box, since the gasket is set on the pressing block, only the middle part of the gasket is stressed, resulting in uneven stress on the gasket as a whole, and it is easy to make the edge of the gasket upturned, causing Deformation affects the sealing effect; second, because the compression block and the transmission rod are two separate parts, during the movement of the transmission rod, the contact point between the transmission rod and the compression block is prone to shift, which affects the sealing effect of the compression block. The third is that when the compression block is put into the gasket installation hole of the crank arm box, the compression block is prone to problems such as skewing in the hole, and the movement of the compression block needs to be adjusted to reduce the work efficiency. There is a large difference in the structure and sealing performance of the combined isolating switch arm box of the disclosed patent and the arm box in the SF6 circuit breaker. The structures of the rings are different. If the sealing ring installation tool in the disclosed patent is used to install the sealing ring of the crank box in the SF6 circuit breaker, the sealing ring of the crank box in the SF6 circuit breaker will not be installed in place or cannot be installed. , and even damage the sealing ring.

Contents of the invention

The purpose of the present invention is to provide a jig for assembling the sealing ring of the crank box, which has a simple structure and is easy to assemble. It can prevent the skeleton sealing ring from being worn or skewed during assembly, ensure the assembly accuracy of the skeleton sealing ring, and effectively improve the assembly pass rate , to meet the dynamic sealing requirements.

The object of the present invention is achieved by adopting the following technical scheme. The present invention provides a jig for assembling the sealing ring of the crank box, which includes a screw rod and a flange. The flange is arranged in the middle of the connecting sleeve, and the outer surface of the upper part of the connecting sleeve is provided with The external thread is provided with a tapered through hole in the connecting sleeve. The diameter of the tapered through hole is large at the top and small at the bottom. A threaded sleeve is connected to the external thread on the upper part of the connecting sleeve. The upper end of the threaded sleeve is provided with a screw connecting sleeve. The connecting sleeve is provided with an internally threaded through hole that is threadedly connected with the screw rod. The screw rod is threaded in the screw connecting sleeve, and the lower end of the screw rod passes through the threaded sleeve. platen.

The present invention is used in this way: when installing the skeleton sealing ring of the crank box in the SF6 circuit breaker, put the skeleton sealing ring into the through hole with a diameter of up to large and down small, and then connect the screw rod and the screw rod connecting sleeve. , by turning the screw to make the pressure plate move downward to compress the skeleton sealing ring toward the small end of the tapered through hole, because the diameter of the small end of the tapered through hole is slightly smaller than the diameter of the sealing hole of the crank box, so under the action of the screw, it can be easily Gently push the frame sealing ring into the sealing hole of the crankcase. Since the screw and the pressure plate are connected by rolling bearings, the contact between the pressure plate and the skeleton seal ring is always in a static state, avoiding rotational friction between the pressure plate and the skeleton seal ring, preventing the skeleton seal ring from being worn or skewed, and ensuring the assembly accuracy of the skeleton seal ring; because The pressure plate and the screw rod are connected together through bearings, just put the skeleton sealing ring into the big end of the tapered through hole, even if the skeleton sealing ring is skewed in the tapered through hole, the pressure plate will also press the skeleton in the process of pressing down. The sealing ring is guided to ensure the installation accuracy of the sealing ring.

Due to the adoption of the above technical solution, the present invention has the following advantages: simple structure, convenient assembly, it can prevent the skeleton sealing ring from being worn or skewed during assembly, and ensure the assembly accuracy of the skeleton sealing ring; effectively improve the assembly qualification rate and meet the requirements of dynamic sealing Require.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

FIG. 2 is a cross-sectional view of FIG. 1 .

Fig. 3 is a schematic diagram of the assembly of the present invention and the crank box.

Among them, 1-screw, 2-flange, 3-connection sleeve, 4-thread sleeve, 41-screw connection sleeve, 5-bearing, 6-pressure plate, 7-knob box installation hole, 8-knob box seal Hole, 9-handle, 10-arm box, 11-skeleton sealing ring.

Detailed ways

In order to make the technical means, creative features, goals and functions achieved by the present invention clearer and easier to understand, the present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments:

Refer to Figure 1-3 for a jig box sealing ring assembly fixture, including a screw 1 and a flange 2, the flange 2 is set in the middle of the connecting sleeve 3, and the outer surface of the upper part of the connecting sleeve 3 is provided with external threads , a tapered through hole is provided in the connecting sleeve 3, the diameter of the tapered through hole is large at the top and small at the bottom, a threaded sleeve 4 is connected to the upper part of the connecting sleeve 3, and the upper end of the threaded sleeve 4 is provided with a screw connecting sleeve 41. The screw connecting sleeve 41 is provided with an internally threaded through hole threaded with the screw 1, the screw 1 is threaded in the screw connecting sleeve 41, and the lower end of the screw 1 passes through the threaded sleeve 4, and the lower end of the screw 1 passes through the bearing 5 A pressing plate 6 capable of passing through the smallest diameter end of the tapered through hole is connected.

Fit the lower part of the connecting sleeve 3 in the present invention into the crank box installation hole 7, and fix it with the crank box 10 through the flange plate 2, and put the skeleton sealing ring 11 in the diameter of the upper, lower, and lower tapered channel. In the hole, the screw 1 is assembled and connected with the screw connecting sleeve 41, and the pressure plate 6 moves downward by rotating the screw 1 to compress the skeleton sealing ring 11 toward the small end of the tapered through hole. The diameter of the small end of the tapered through hole is slightly smaller than the crank arm The diameter of the box sealing hole 8, so under the action of the screw rod 1, the skeleton sealing ring 11 can be easily pushed into the crank box sealing hole 8. Since the screw 1 and the pressing plate 6 are connected by the bearing 5, the contact between the pressing plate 6 and the skeleton sealing ring 11 is always kept in a static state, avoiding rotational friction between the pressing plate 6 and the skeleton sealing ring 11, and preventing the skeleton sealing ring 11 from being worn or skewed. Ensure the assembly accuracy of the skeleton sealing ring 11; because the pressure plate 6 is connected with the screw 1 as a whole, when the pressure block 6 is put into the sealing hole 8 of the crank box, the pressure block 6 will not be skewed in the hole due to the guiding effect of the screw 1 , can realize the effective extrusion of the skeleton sealing ring 11. The invention is simple and convenient to assemble, effectively improves the qualified rate of assembly, and meets the requirements of dynamic sealing.

Further, the bearing 5 is a ball bearing, and the screw 1 and the pressing plate 6 are connected by a ball bearing, so that the screw 1 idles on the pressing plate 6, and the pressing plate will not rotate with the rotation of the screw, so the pressing plate 6 and the skeleton sealing ring The contact of 11 is always static, avoiding the wear of the end face of the skeleton sealing ring 11 caused by the rotating friction between the pressing plate and the skeleton sealing ring.

Further, the diameter of the lower part of the connecting sleeve 3 is smaller than the diameter of the crank box installation hole 7, which makes the assembly of the present invention and the crank box 10 efficient and convenient.

Further, the diameter of the small end of the tapered through hole is smaller than the diameter of the crank box sealing hole 8, and the skeleton sealing ring 11 placed in the tapered through hole can easily enter the crank box sealing hole 8, ensuring the assembly quality.

Further, the pressing plate 6 is circular, and the shape of the pressing plate 6 corresponds to the skeleton sealing ring 11, so as to avoid the deformation of the skeleton sealing ring 11 due to uneven force during the pushing process and ensure the sealing effect.

Further, a handle 9 is provided on the upper end of the screw 1 , and the up and down movement of the screw 1 is realized by rotating the handle 9 .

Claims (6)

1. An assembly fixture for the sealing ring of the crank box, comprising a screw rod (1) and a flange (2), characterized in that: the flange (2) is arranged in the middle of the connecting sleeve (3), and the connecting sleeve (3) The outer surface of the upper part is provided with an external thread, and a tapered through hole is provided in the connecting sleeve (3). The diameter of the tapered through hole is large at the top and small at the bottom. (4), the upper end of the threaded sleeve (4) is provided with a screw connecting sleeve (41), and the screw connecting sleeve (41) is provided with an internally threaded through hole that is threaded with the screw (1), and the screw (1) is threaded on In the screw rod connection sleeve (41), and the lower end of the screw rod (1) passes through the threaded sleeve (4), the lower end of the screw rod (1) is connected with the pressing plate (6) that can pass through the smallest diameter end of the tapered through hole by the bearing (5). 2. The jig for assembling the sealing ring of the crank box according to claim 1, characterized in that: the bearing (5) is a ball bearing. 3. The jig for assembling the crank box sealing ring according to claim 2, characterized in that the diameter of the lower part of the connection sleeve (3) is smaller than the diameter of the crank box installation hole (7). 4. A jig for assembling the crank box sealing ring according to claim 1, 2 or 3, characterized in that the diameter of the small end of the tapered through hole is smaller than the diameter of the crank box sealing hole (8). 5. The jig for assembling the sealing ring of the crank box according to claim 4, characterized in that the pressing plate (6) is circular. 6 . The jig for assembling the sealing ring of the crank box according to claim 5 , wherein a handle ( 9 ) is provided on the upper end of the screw rod ( 1 ).