Vacuum circuit breaker plum blossom contact assembling and disassembling tool

Abstract

The utility model discloses a vacuum circuit breaker plum blossom contact dismounting tool which comprises a sleeve, an ejector rod axially arranged in the sleeve in a sliding mode and an annular expansion piece fixedly connected to one end of the sleeve, the two ends of the ejector rod are located on the outer side of the sleeve, and the expansion piece comprises an arc-shaped splicing piece and an elastic structure surrounding the splicing piece into a ring shape. One end of the ejector rod is connected with a hand wheel, the other end of the ejector rod is coaxially and fixedly provided with an expansion end, the outer diameter of the expansion end is larger than that of the ejector rod, a conical transition section is arranged between the expansion end and the outer wall of the ejector rod and located in the expansion piece, and the outer diameter of the expansion end is larger than the inner diameter of the expansion piece. According to the utility model, the hand of a maintainer can be effectively prevented from being pinched in the process of disassembling and assembling the plum blossom contact, and the working efficiency of disassembling and assembling the plum blossom contact of the vacuum circuit breaker is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power maintenance tools, in particular to a disassembly and assembly tool for the plum blossom contact of a vacuum circuit breaker. Background Art

[0002] The plum blossom contacts commonly used in the vacuum circuit breakers of high-voltage switch cabinets are consumables and need to be maintained regularly. The plum blossom contacts are tightened by 4 groups of springs with a wire diameter of 1.1 - 1.4 mm according to the rated current of the supporting vacuum circuit breaker. During the process of disassembling and assembling the plum blossom contacts, maintenance personnel are often clamped by the contact springs or scratched by the springs that are pushed off because there is no suitable special tool, resulting in low disassembly and assembly efficiency and long maintenance time. Especially in the case of emergency power repair, the long maintenance time will cause certain economic losses. Summary of the Invention

[0003] Aiming at the deficiencies in the prior art, the utility model provides a disassembly and assembly tool for the plum blossom contact of a vacuum circuit breaker, which solves the problems of contact spring clamping hands, spring pushing off and injuring people during the disassembly and assembly of the plum blossom contact and improves the maintenance efficiency.

[0004] To solve the above technical problems, the technical solution adopted by the utility model is: a disassembly and assembly tool for the plum blossom contact of a vacuum circuit breaker, including a sleeve, a ejector rod axially slidably arranged in the sleeve, and an annular expansion piece fixedly connected to one end of the sleeve. Both ends of the ejector rod are located outside the sleeve. The expansion piece includes an arc-shaped splicing piece and an elastic structure that encloses the splicing piece into a ring. One end of the ejector rod is connected with a hand wheel, and the other end of the ejector rod is coaxially and fixedly provided with an expansion end. The outer diameter of the expansion end is larger than the outer diameter of the ejector rod. A conical transition section is arranged between the outer wall of the expansion end and the ejector rod. The transition section is located inside the expansion piece, and the outer diameter of the expansion end is larger than the inner diameter of the expansion piece.

[0005] Preferably, a ring-shaped protrusion is coaxially and fixedly arranged on the end wall of the expansion piece. A connecting ring is coaxially and fixedly arranged at the end of the sleeve. The outer side wall of the connecting ring is provided with ear plates arranged at equal angles along the axis of the sleeve, and the ear plates are arranged in pairs. A plug board adapted to the ear plates is fixedly arranged on the end wall of the movable end of the ring-shaped protrusion, and the width of the plug board is equal to the distance between the ear plates arranged in pairs. Connecting holes for the locking pins to pass through are correspondingly arranged on the ear plates and the plug board.

[0006] Preferably, an annular groove is formed on the outer side wall of the expansion piece, and the elastic structure is an arc-shaped constant force spring installed in the annular groove.

[0007] Preferably, the hand wheel is threadedly connected to the ejector rod.

[0008] Preferably, a thrust bearing is coaxially arranged at the end of the sleeve, and the hand wheel is in contact with the end wall of the thrust bearing.

[0009] The utility model provides a plum blossom contact disassembly and assembly tool for a vacuum circuit breaker. When disassembling or assembling the plum blossom contact, a maintenance worker inserts the tool into the inner hole of the plum blossom contact, holds a push rod so that it cannot rotate, and rotates a hand wheel clockwise to drive the push rod to move. The conical platform of the push rod spreads an expansion piece to enlarge the inner hole of the plum blossom contact, which is convenient for disassembling or installing the plum blossom contact from the contact arm of the vacuum circuit breaker. There is no need to disassemble four groups of tightening springs of the plum blossom contact, so that the maintenance worker is prevented from being pinched or scratched by the tightening springs, thereby shortening the maintenance time. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0011] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0012] Figure 2 It is a schematic diagram of the structure of the push rod and the hand wheel in the embodiment of the utility model.

[0013] Figure 3 It is a schematic diagram of the expansion piece structure in the embodiment of the utility model.

[0014] Figure 4 It is a schematic diagram of the sleeve structure in the embodiment of the utility model.

[0015] In the above drawings: 1. push rod; 2. expansion plate; 3. constant force spring; 4. sleeve; 5. locking pin; 6. thrust bearing; 7. hand wheel. DETAILED DESCRIPTION

[0016] like Figures 1-4 As shown, the utility model provides a vacuum circuit breaker plum blossom contact disassembly and assembly tool, including a sleeve 4, a push rod 1 axially slidably arranged in the sleeve 4 and an annular expansion piece 2 fixedly connected to one end of the sleeve 4, both ends of the push rod 1 are located on the outside of the sleeve 4, the expansion piece 2 includes an arc-shaped splicing piece and an elastic structure that surrounds the splicing piece into a ring, one end of the push rod 1 is connected to a hand wheel 7, the other end of the push rod 1 is coaxially fixed with an expansion end, the outer diameter of the expansion end is larger than the outer diameter of the push rod 1, a conical transition section is arranged between the expansion end and the outer wall of the push rod 1, the transition section is located in the expansion piece 2, and the outer diameter of the expansion end is larger than the inner diameter of the expansion piece 2.

[0017] To facilitate the removal and installation of the plum blossom contact, insert the expansion piece 2 into the inner hole of the plum blossom contact, turn the hand wheel 7, and hold the push rod 1 so that the push rod 1 cannot rotate freely in the sleeve 4. During the process of turning the hand wheel 7, the hand wheel 7 is used to press against the sleeve 4, so that the push rod 1 moves axially in the sleeve 4. During the movement of the push rod 1, the transition section presses against the inner circle of the expansion piece 2, so that the push rod 1 opens the expansion piece 2, and the expansion piece 2 expands the inner hole of the plum blossom contact. The maintenance personnel can easily remove or install the plum blossom contact on the contact arm of the vacuum circuit breaker.

[0018] As shown in Figure 1 , Figure 3 and Figure 4 . An annular protrusion is coaxially and fixedly arranged on the end wall of the expansion piece 2, and a connecting ring is coaxially and fixedly arranged at the end of the sleeve 4. The outer side wall of the connecting ring is provided with ear plates arranged at equal angles along the axis of the sleeve 4, and the ear plates are arranged in pairs. An insertion plate adapted to the ear plates is fixedly arranged on the movable end wall of the annular protrusion, and the width of the insertion plate is equal to the distance between the ear plates arranged in pairs. Connecting holes for the locking pin 5 to pass through are correspondingly arranged on the ear plates and the insertion plate.

[0019] The expansion piece 2 includes three splicing pieces, and the three splicing pieces enclose a ring shape. An insertion plate is arranged on each splicing piece, and there are three pairs of ear plates. The insertion plates correspond to the ear plates. After the expansion piece 2 forms a ring shape, by inserting the insertion plates into the ear plates and passing the locking pin 5 through the ear plates and the insertion plates at the same time, the expansion piece 2 is fixed to the end of the sleeve 4.

[0020] When the ejector rod 1 moves axially along the sleeve 4, the ejector rod 1 pushes the movable end of the expansion piece 2 outwards, causing the expansion piece 2 to open, and the splicing piece rotates around the locking pin 5.

[0021] As shown in Figure 3 . An annular groove is formed on the outer side wall of the expansion piece 2, and the elastic structure is an arc-shaped constant force spring 3 installed in the annular groove. An annular groove is provided on the expansion piece 2, the constant force spring 3 is arc-shaped, and the central angle of the constant force spring 3 is greater than 180°, so that the constant force spring 3 can be easily installed in the annular groove of the expansion piece 2. The constant force spring 3 is used for the reset of the expansion piece 2 after it is opened, so as to facilitate the removal of the disassembly and assembly tool from the plum blossom contact.

[0022] As shown in Figure 1 and Figure 2 . The handwheel 7 is threadedly connected to the ejector rod 1. By rotating the handwheel 7 and holding the ejector rod 1 so that it cannot rotate, during the rotation of the handwheel 7, the handwheel 7 abuts against the sleeve 4, pulling the ejector rod 1 outwards, realizing the axial sliding of the ejector rod 1, and then pushing open the expansion piece 2.

[0023] As shown in Figure 1 . A thrust bearing 6 is coaxially arranged at the end of the sleeve 4, and the handwheel 7 is in contact with the end wall of the thrust bearing 6. An annular groove is provided at the end of the sleeve 4 for installing the thrust bearing 6, and the thrust bearing 6 is used to reduce the friction force of the rotation of the handwheel 7.

Claims

1. A vacuum circuit breaker plum blossom contact disassembly and assembly tool, characterized by: The invention comprises a sleeve (4), a push rod (1) axially slidably arranged in the sleeve (4), and an annular expansion piece (2) fixedly connected to one end of the sleeve (4), wherein both ends of the push rod (1) are located outside the sleeve (4), the expansion piece (2) comprises an arc-shaped splicing piece and an elastic structure that surrounds the splicing piece into a ring, one end of the push rod (1) is connected to a hand wheel (7), and the other end of the push rod (1) is coaxially fixedly provided with an expansion end, the outer diameter of the expansion end is larger than the outer diameter of the push rod (1), a conical transition section is provided between the expansion end and the outer wall of the push rod (1), the transition section is located inside the expansion piece (2), and the outer diameter of the expansion end is larger than the inner diameter of the expansion piece (2).

2. A vacuum circuit breaker plum blossom contact disassembly and assembly tool as claimed in claim 1, characterized in that: An annular protrusion is coaxially fixedly provided on the end wall of the expansion piece (2), a connecting ring is coaxially fixedly provided on the end of the sleeve (4), ear plates are arranged at equal angles on the outer wall of the connecting ring along the axis of the sleeve (4), and the ear plates are arranged in pairs, and a plug plate adapted to the ear plate is fixedly provided on the end wall of the movable end of the annular protrusion, and the width of the plug plate is equal to the spacing between the ear plates arranged in pairs, and the ear plate and the plug plate are both provided with corresponding connecting holes for the locking pin (5) to pass through.

3. A vacuum circuit breaker plum blossom contact disassembly and assembly tool as claimed in claim 1, characterized in that: An annular groove is provided on the outer side wall of the expansion piece (2), and the elastic structure is an arc-shaped constant force spring (3) installed in the annular groove.

4. A vacuum circuit breaker plum blossom contact disassembly and assembly tool as claimed in claim 1, characterized in that: The hand wheel (7) is threadedly connected to the push rod (1).

5. A vacuum circuit breaker plum blossom contact disassembly and assembly tool as claimed in claim 4, characterized in that: A thrust bearing (6) is coaxially arranged at the end of the sleeve (4), and the hand wheel (7) is in contact with the end wall of the thrust bearing (6).

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