Auxiliary unlocking tool for Mueller NZM drawer type circuit breaker

Abstract

The utility model discloses an auxiliary unlocking tool for a Mueller NZM drawer type circuit breaker, which comprises a thumb pressing piece, a positioning piece and a sliding block fixing assembly, and is characterized in that the thumb pressing piece is positioned on an unlocking sliding block of a circuit breaker handle, extends towards the outside of the circuit breaker handle and is used for being pressed by a thumb during unlocking; the positioning piece is arranged at the bottom of the thumb pressing piece, a positioning hole is formed in an unlocking sliding block of the circuit breaker handle, and the positioning piece is inserted into the positioning hole during use; the sliding block fixing assembly is vertically arranged on the thumb pressing piece, the sliding block fixing assembly is configured to move in the vertical direction, a fixing hole is formed in the circuit breaker handle, and after the sliding block fixing assembly penetrates into the fixing hole, the unlocking sliding block is kept in an unlocking state. According to the tool, the thumb pressing piece serves as extension of the unlocking sliding block, the contact area of the thumb pressing position is increased, force application is facilitated, overlarge local stress is avoided, operation is easier, and meanwhile the operation comfort of operators is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to an auxiliary unlocking tool for a Mueller NZM drawer-type circuit breaker. Background Art

[0002] like Figure 1 As shown, Muller NZM drawer circuit breaker is a 400V low-voltage circuit breaker used to control and protect low-voltage circuits and their power distribution equipment. It consists of a circuit breaker body 1 and a drawer seat 2. The circuit breaker body 1 is placed on the left and right rails on both sides of the drawer seat 2. The busbar on the circuit breaker body 1 is inserted into the bridge contact on the drawer seat 2 to connect the main circuit. Muller NZM drawer circuit breaker has two working positions: "working" position and "isolation" position. When a circuit fails or the equipment needs to be repaired, the circuit breaker needs to be placed in the "isolation" position, that is, the circuit breaker body 1 can be pulled out of the drawer seat 2.

[0003] like Figure 2-3 As shown (to facilitate the demonstration of the unlocking principle, Figure 2 The figure is a state diagram when the front door of the circuit breaker body 1 is open. When actually unlocked, the front door of the circuit breaker body 1 is in a closed state. In order to ensure the reliability of the lock and prevent the circuit breaker from being pulled in error, the Muller NZM drawer-type circuit breaker is provided with a mechanical unlocking device 15. The unlocking slider 12 is installed on the upper end of the circuit breaker handle 11. The unlocking slider 12 moves along the slide rail 13. There is a sliding guide rod 14 in the slide rail 13. When unlocking, the four fingers hold the circuit breaker handle 11, and the thumb continuously presses the unlocking slider 12 to move the sliding guide rod 14 forward and push the baffle 16 of the mechanical unlocking device 15 in the circuit breaker forward, thereby releasing the lock pin 17 from the round hole on the drawer seat 2 to achieve the purpose of unlocking.

[0004] However, the front force bearing area of ​​the unlocking slider 12 is small, and it is difficult for the thumb to exert force. Moreover, when the thumb presses the unlocking slider 12, the circuit breaker handle 11 must be held to pull out the circuit breaker. The pressing force of the thumb and the pulling force of the palm are opposite, and it is difficult to exert force at the same time, which often leads to unlocking failures, a long unlocking time, and low efficiency. Utility Model Content

[0005] In view of the above problems, the utility model provides an auxiliary unlocking tool for a Mueller NZM drawer-type circuit breaker, which is used to assist in unlocking the circuit breaker to improve the unlocking convenience and operating comfort.

[0006] Specifically, the utility model provides an auxiliary unlocking tool for a Mueller NZM drawer-type circuit breaker, comprising:

[0007] A thumb pressing piece, located on the unlocking slide block of the circuit breaker handle, extending to the outside of the circuit breaker handle, and used for being pressed by the thumb when unlocking;

[0008] A positioning piece is arranged at the bottom of the thumb pressing piece, and a positioning hole is arranged on the unlocking slide block of the circuit breaker handle. When in use, the positioning piece is inserted into the positioning hole;

[0009] The slider fixing assembly is vertically arranged on the thumb pressing piece. The slider fixing assembly is configured to move in the vertical direction. A fixing hole is provided on the circuit breaker handle. After the slider fixing assembly is inserted into the fixing hole, the unlocking slider is kept in an unlocking state.

[0010] Furthermore, the thumb pressing piece is composed of a pressing portion and a connecting portion to form an L-shaped structure, the pressing portion is in an arc shape, and the positioning piece is located at the bottom of the connecting portion.

[0011] Furthermore, the auxiliary unlocking tool also includes:

[0012] A limit housing is provided on the thumb pressing member, and the slider fixing assembly vertically passes through the limit housing;

[0013] The locking component passes through the limiting shell in a horizontal shape. The locking component is provided with a through hole. The slider fixing component extends downward after passing through the through hole. The length of the through hole is greater than the width of the slider fixing component, so that the locking component can move in the horizontal direction.

[0014] Furthermore, the locking assembly comprises:

[0015] A locking pin is inserted into the limiting housing in a horizontal shape, the through hole is provided on the locking pin, and a locking plate is provided at one end of the locking pin that penetrates the limiting housing, and the locking plate is used to lock the slider fixing assembly;

[0016] The locking spring is arranged at one end of the locking pin away from the locking plate, one end of which is connected to the limit housing, and the other end is connected to the end baffle of the locking pin; in the unlocked state, the locking spring is in a compressed state.

[0017] Furthermore, the slider fixing assembly includes:

[0018] A fixing pin having a locking groove thereon, wherein in a locked state, the fixing pin penetrates into the fixing hole, and the locking plate extends into the locking groove;

[0019] A reset spring is located at the upper part of the fixing pin, one end of which is connected to the fixing pin end baffle, and the other end is connected to the limit housing. In the locked state, the reset spring is in a compressed state.

[0020] Furthermore, a slide groove is provided on the inner side of the limiting shell, and the locking plate is slidably connected in the slide groove.

[0021] Working principle:

[0022] The thumb pressing piece 3 is placed above the unlocking slider 12 of the circuit breaker handle 11, and the positioning piece 6 is inserted into the positioning hole 18 of the unlocking slider 12 at the top of the circuit breaker handle 11. The thumb pressing piece 3 is an extension of the unlocking slider 12, which increases the contact area of ​​the thumb pressing position, thereby reducing the pressure on the finger under the same pressure, so that when the palm of the hand tightly grasps the circuit breaker handle 11, the thumb can easily press the thumb pressing piece 3, and then the thumb pushes the thumb pressing piece 3, and the unlocking slider 12 is driven to move along the slide rail 13 through the positioning piece 6, so that the sliding guide rod 14 is pushed out, and the baffle 16 of the mechanical unlocking device 15 in the circuit breaker is pushed forward, so that the lock pin 17 is released from the round hole of the bottom plate. After that, the fixing pin 51 is pressed down to make it penetrate into the fixing hole 19 on the circuit breaker handle 11. When the locking groove 53 of the fixing pin 51 moves downward into the through hole 73, the locking plate 72 is freed from the restriction of the outer wall of the fixing pin 51, and the locking spring 74 rebounds, driving the locking pin 71 and the locking plate 72 to move into the locking groove 53, and finally enters and snaps into the locking groove 53, restricting the fixing pin 51, fixing the position of the unlocking slider 12, and keeping the sliding guide rod 14 in the pushed-out state. When the locking pin 71 is pressed, the locking plate 72 is pushed out of the locking groove 53, and under the elastic force of the reset spring 53, the fixing pin 51 moves up and exits the fixing hole 19, and the unlocking slider 12 can move out of the unlocking state.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] (1) The auxiliary unlocking tool provided by the utility model uses the thumb pressing piece as an extension of the unlocking slider, thereby increasing the contact area of ​​the thumb pressing position, thereby reducing the pressure on the fingers under the same pressure, allowing the palm to exert force effectively and avoiding excessive local force. It is easier to operate and also improves the operating comfort of the operator.

[0025] (2) When the unlocking slider reaches the unlocking position by pressing the thumb push piece, press the fixing pin to insert it into the fixing hole of the circuit breaker handle, so that the unlocking slider can always remain in the unlocked state, so that the circuit breaker body can be restored to the locked state later. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the existing Mueller NZM drawer type circuit breaker;

[0027] Figure 2 This is a schematic diagram of the unlocking action of the existing Mueller NZM drawer-type circuit breaker;

[0028] Figure 3 It is a structural schematic diagram of an existing circuit breaker handle;

[0029] Figure 4 This is a schematic diagram of the structure of the auxiliary unlocking tool in Example 1;

[0030] Figure 5 An exploded view of the auxiliary unlocking tool in Example 1;

[0031] Figure 6 This is a schematic diagram of the unlocking action of the auxiliary unlocking tool in Example 1;

[0032] Figure 7 This is a schematic diagram of the auxiliary unlocking tool in Example 1 in use;

[0033] Figure 8 This is a schematic diagram of the action of the auxiliary unlocking tool when resetting in Example 1.

[0034] Reference numerals:

[0035] 1-circuit breaker body; 11-circuit breaker handle; 12-unlocking slider; 13-slide rail; 14-slide guide rod; 15-mechanical unlocking device; 16-baffle; 17-locking pin; 18-positioning hole; 19-fixing hole; 2-drawer seat; 3-thumb press piece; 31-pressing part; 32-connecting part; 4-limiting shell; 41-slide groove; 5-slider fixing assembly; 51-fixing pin; 52-reset spring; 53-locking groove; 6-positioning piece; 7-locking assembly; 71-locking pin; 72-locking plate; 73-through hole; 74-locking spring. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0037] Example 1

[0038] like Figure 4-5 As shown, this embodiment provides an auxiliary unlocking tool for Mueller NZM drawer-type circuit breaker, including: a thumb pressing piece 3, a slider fixing assembly 5 and a locking assembly 7. The thumb pressing piece 3 includes: a pressing portion 31 and a connecting portion 32. The pressing portion 31 extends outward from the unlocking slider 12, and is concave in an arc shape as a whole to adapt to the arc shape of the thumb, which is convenient for thumb pressing. The connecting portion 32 is horizontal, and two positioning pieces 6 are provided at the bottom. The unlocking slider 12 is provided with two positioning holes 18. The positioning piece 6 extends into the positioning holes 18. The auxiliary unlocking tool is installed on the unlocking slider 12 to facilitate unlocking.

[0039] A limit housing 4 is provided on the connection portion 32, a slider fixing assembly 5 vertically passes through the limit housing 4, and a locking assembly 7 horizontally passes through the limit housing 4. The slider fixing assembly 5 includes a fixing pin 51 and a reset spring 52, the upper end of the fixing pin 51 is a baffle, the reset spring 52 is located between the baffle and the limit housing 4, and a locking groove 53 is provided on the fixing pin 51. When the fixing pin 51 is pressed down, it passes through the connection portion 32, the unlocking slider 12 and the fixing hole 19, and uses its lower end to limit the movement of the unlocking slider 12, so that the sliding guide rod 14 can always remain in an extended state (that is, the locking pin 17 always remains in a high position), so as to facilitate the quick connection of the circuit breaker body 1 after the maintenance is completed.

[0040] The locking assembly 7 includes: a locking pin 71, a locking spring 74 and a locking plate 72. The locking pin 71 is horizontally inserted into the limiting housing 4, and its left end is a baffle. The locking spring 74 is located between the baffle and the limiting housing 4. The locking plate 72 is located in the slide groove 41 inside the limiting housing 4, and can move horizontally along the slide groove 41, that is, when the locking pin 71 is pushed to the right, the locking plate 72 moves to the right along the slide groove 41. The locking plate 72 is provided with a through hole 73, which can be an oblong hole, an elliptical hole, etc., and its length is greater than the diameter of the slider fixing pin 51, so that the locking plate 72 and the locking pin 71 can move in the horizontal direction. When the fixing pin 51 is pressed down and the locking groove 53 enters the through hole 73, the locking plate 72 is freed from the restriction of the outer wall of the fixing pin 51, and the locking spring 74 rebounds instantly, driving the locking plate 72 to move leftward, so that the locking plate 72 part on the right side of the through hole 73 is stuck in the locking groove 53, thereby restricting the fixing pin 51 from moving up under the action of the return spring 52 and maintaining the unlocked state. When the locking pin 71 is pressed, the locking plate 72 is pushed out of the locking groove 53, and under the elastic force of the return spring 52, the fixing pin 51 moves up and exits the fixing hole 19, and the unlocking slider 12 can move and exit the unlocked state.

[0041] The above specific examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. For those skilled in the art of the present invention, some simple deductions, deformations or substitutions can be made based on the idea of ​​the present invention.

Claims

1. An auxiliary unlocking tool for Mueller NZM drawer type circuit breaker, characterized in that: include: A thumb pressing piece (3) is located on an unlocking slide block (12) of the circuit breaker handle (11), extends outside the circuit breaker handle (11), and is used for being pressed by a thumb when unlocking; A positioning member (6) is arranged at the bottom of the thumb pressing member (3), and a positioning hole (18) is arranged on the unlocking slider (12). When in use, the positioning member (6) is inserted into the positioning hole (18); A slider fixing assembly (5) is vertically arranged on the thumb pressing member (3), the slider fixing assembly (5) being configured to move in a vertical direction, a fixing hole (19) being provided on the circuit breaker handle (11), and after the slider fixing assembly (5) is inserted into the fixing hole (19), the unlocking slider (12) is kept in an unlocked state.

2. The auxiliary unlocking tool for Mueller NZM drawer-type circuit breaker according to claim 1, characterized in that: The thumb pressing piece (3) is composed of a pressing portion (31) and a connecting portion (32) to form an L-shaped structure, the pressing portion (31) is in an arc shape, and the positioning piece (6) is located at the bottom of the connecting portion (32).

3. The auxiliary unlocking tool for Mueller NZM drawer-type circuit breaker according to claim 1 or 2, characterized in that: Also includes: A limiting shell (4) is arranged on the thumb pressing member (3), and the slider fixing assembly (5) vertically passes through the limiting shell (4); The locking assembly (7) passes through the limiting housing (4) in a horizontal shape. The locking assembly (7) is provided with a through hole (73). The slider fixing assembly (5) passes through the through hole (73) and extends downward. The length of the through hole (73) is greater than the width of the slider fixing assembly (5), so that the locking assembly (7) can move in the horizontal direction.

4. The auxiliary unlocking tool for Mueller NZM drawer type circuit breaker according to claim 3, characterized in that: The locking assembly (7) comprises: A locking pin (71) is horizontally inserted into the limiting housing (4), the through hole (73) is provided on the locking pin (71), and a locking plate (72) is provided at one end of the locking pin (71) that penetrates into the limiting housing (4), and the locking plate (72) is used to lock the slider fixing assembly (5); A locking spring (74) is arranged at one end of the locking pin (71) away from the locking plate (72), one end of which is connected to the limiting housing (4) and the other end of which is connected to the end baffle of the locking pin (71); in the unlocked state, the locking spring (74) is in a compressed state.

5. The auxiliary unlocking tool for Mueller NZM drawer-type circuit breaker according to claim 4, characterized in that: The slider fixing assembly (5) comprises: A fixing pin (51) having a locking groove (53) thereon, wherein in a locked state, the fixing pin (51) penetrates into the fixing hole (19), and the locking plate (72) is inserted into the locking groove (53); A return spring (52) is located on the upper part of the fixing pin (51), one end of which is connected to the end baffle of the fixing pin (51) and the other end of which is connected to the limit housing (4). In the locked state, the return spring (52) is in a compressed state.

6. The auxiliary unlocking tool for Mueller NZM drawer type circuit breaker according to claim 4, characterized in that: A sliding groove (41) is provided on the inner side of the limiting housing (4), and the locking plate (72) is slidably connected in the sliding groove (41).

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