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 thrust seat, a positioning piece and a support plate, the thrust seat is arranged at one end of the thrust seat close to a circuit breaker handle, and an unlocking slide block of the circuit breaker handle is provided with a positioning hole; the supporting plate is arranged on the thrust seat close to the outer side of the circuit breaker handle, and a spring is arranged between the supporting plate and the thrust seat; during use, the thrust seat is arranged on the outer side of the circuit breaker handle, the supporting plate is attached to the outer side of the circuit breaker handle, and the positioning piece is inserted into the positioning hole. According to the auxiliary tool, force application points do not need to be increased, the unlocking sliding block is pushed out through effective force application of the palm tightly holding the handle when the circuit breaker is pulled out, so that the unlocking purpose is achieved, the unlocking process is more labor-saving and easy to operate, and the problem that an existing unlocking mode is inconvenient to operate is effectively solved.

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 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 convenience and reliability of unlocking.

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

[0007] Thrust seat;

[0008] The positioning member is provided at one end of the thrust seat close to the circuit breaker handle. A positioning hole is provided on the unlocking slider of the circuit breaker handle. During use, the positioning member is inserted into the positioning hole.

[0009] The support plate is provided outside the thrust seat near the circuit breaker handle. A spring is provided between the support plate and the thrust seat.

[0010] During use, the thrust seat is placed outside the circuit breaker handle, and the support plate is in contact with the outside of the circuit breaker handle.

[0011] Further, the thrust seat is in a "C" shape adapted to the circuit breaker handle, and the length of the upper end is greater than that of the lower end. The positioning member is located at the upper end of the thrust seat, and the support plate is slidably arranged within the frame of the thrust seat.

[0012] Further, a guide block is provided at the upper end of the thrust seat, and a chute is provided at the lower end. A groove adapted to the guide block is provided at the upper end of the support plate, and a slider adapted to the chute is provided at the lower end.

[0013] Further, the positioning member is a screw.

[0014] Working principle:

[0015] Place the thrust seat 3 at the circuit breaker handle 11, insert the positioning member 6 into the positioning hole of the unlocking slider at the top of the circuit breaker handle 11. When firmly gripping the grip part of the circuit breaker handle 11 with the palm, when the palm exerts force, the palm presses the thrust seat 3. Blocked by the circuit breaker handle 11 and the support plate 4, the thrust seat 3 compresses the spring 5 and moves forward, driving the unlocking slider 12 to move along the slide rail 13 through the positioning member 6, thereby pushing out the sliding guide rod 14, pushing the baffle 16 of the mechanical unlocking device 15 inside the circuit breaker forward, and thus releasing the locking pin 17 from the round hole in the bottom plate to achieve the purpose of unlocking.

[0016] Compared with the prior art, the beneficial effects of the present utility model are:

[0017] (1) The auxiliary unlocking tool provided by the present utility model does not require adding a force application point. By effectively exerting force with the palm that tightly holds the handle when pulling out the circuit breaker, the unlocking slider is pushed out, thereby achieving the unlocking purpose. The unlocking process is more labor-saving and easy to operate, effectively solving the problem of inconvenient operation of the existing unlocking method.

[0018] (2) This tool is installed and used on-site and does not need to be installed on each Moller NZM drawer-type circuit breaker, which can reduce the transformation cost, avoid the problem that others may misoperate the circuit breaker when it is fixed to the circuit breaker handle, and ensure the safety and reliability of the locking. Description of the drawings

[0019] Figure 1It is a schematic structural diagram of an existing Moller NZM draw-out circuit breaker;

[0020] Figure 2 It is a schematic diagram of the unlocking action of an existing Moller NZM draw-out circuit breaker;

[0021] Figure 3 It is a schematic structural diagram of an existing circuit breaker handle;

[0022] Figure 4 It is a schematic structural diagram of the auxiliary unlocking tool in Embodiment 1;

[0023] Figure 5 It is an exploded view of the auxiliary unlocking tool in Embodiment 1;

[0024] Figure 6 It is a schematic diagram of the action of the auxiliary unlocking tool in Embodiment 1;

[0025] Figure 7 It is a schematic diagram of the usage state of the auxiliary unlocking tool in Embodiment 1.

[0026] Reference numerals:

[0027] 1 - Circuit breaker body; 11 - Circuit breaker handle; 12 - Unlocking slider; 13 - Slide rail; 14 - Sliding guide rod; 15 - Mechanical unlocking device; 16 - Baffle; 17 - Lock pin; 18 - Positioning hole; 2 - Drawer base; 3 - Thrust seat; 31 - Guide block; 32 - Chute; 4 - Support plate; 41 - Groove; 42 - Slider; 5 - Spring; 6 - Positioning member. Detailed implementation manners

[0028] The following further elaborates on the present utility model in detail through specific implementation manners in conjunction with the drawings.

[0029] Embodiment 1

[0030] As Figure 4-5 shown, this embodiment provides an auxiliary unlocking tool for a Moller NZM draw-out circuit breaker, including: a thrust seat 3, a support plate 4, and a positioning member 6. The thrust seat 3 is an integrated structure composed of a vertical plate and two horizontal plates. The connection between the vertical plate and the horizontal plates is a right angle, thus forming a "C" shape, and the length of the upper horizontal plate is greater than that of the lower horizontal plate. The positioning member 6 is located on the upper horizontal plate. A positioning hole 18 is provided on the unlocking slider 12. The positioning member 6 is a screw rod and is threadedly connected to the upper horizontal plate. By rotating the positioning member 6, the length of the positioning member 6 extending into the frame of the thrust seat 3 can be adjusted so as to install the auxiliary unlocking tool onto the circuit breaker handle 11. Specifically: first move the positioning member 6 upward, then align the thrust seat 3 with the circuit breaker handle 11. When the positioning member 6 is opposite to the positioning hole 18, then move the positioning member 6 downward and extend it into the positioning hole 18 to complete the installation of the auxiliary unlocking tool.

[0031] The support plate 4 is installed parallel to the inner side of the thrust seat 3. Two springs 5 ​​are arranged between the support plate 4 and the thrust seat 3. The two springs 5 ​​are respectively placed at the 1 / 4 and 3 / 4 positions between the upper and lower transverse plates of the thrust seat 3. A guide block 31 is arranged at the bottom of the upper transverse plate of the thrust seat 3, and a T-shaped slide groove 32 is arranged on the lower transverse plate. The upper end of the support plate 4 is a groove 41, and the lower end is a T-shaped slide block 42. Figure 6-7 As shown, the gripping force of the vertical plate of the thrust seat 3 by the palm will compress the spring 5, so that the thrust seat 3 extends forward along the guide rail 31 and the slide groove 32. Under the action of the positioning member 6, the unlocking slider 12 on the circuit breaker handle 11 moves forward, drives the sliding guide rod 14 to extend forward, pushes the baffle 16 of the mechanical unlocking device 15, and makes the lock pin 17 of the mechanical unlocking device 15 rise and release from the round hole on the drawer seat 2. At the same time, the circuit breaker is pulled outward with both hands to complete the unlocking. When the hands are released, under the action of the rebound force of the spring 5, the thrust seat 3 moves outward, driving the unlocking slider 12 and the sliding guide rod 14 to return to the initial state.

[0032] 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: Comprising: Thrust seat (3); Positioning member (6), provided at one end of the thrust seat (3) close to the circuit breaker handle (11), a positioning hole (18) is provided on the unlocking slider (12) of the circuit breaker handle (11), and during use, the positioning member (6) is inserted into the positioning hole (18); Support plate (4), provided outside the thrust seat (3) near the circuit breaker handle (11), a spring (5) is provided between the support plate (4) and the thrust seat (3); During use, the thrust seat (3) is placed outside the circuit breaker handle (11), and the support plate (4) is in contact with the outside of the circuit breaker handle (11).

2. The auxiliary unlocking tool for Mueller NZM drawer-type circuit breaker according to claim 1, characterized in that: The thrust seat (3) is in a "C" shape adapted to the circuit breaker handle (11), and the length of the upper end is greater than that of the lower end. The positioning member (6) is located at the upper end of the thrust seat (3), and the support plate (4) is slidably arranged within the frame of the thrust seat (3).

3. The auxiliary unlocking tool for Mueller NZM drawer-type circuit breaker according to claim 2, characterized in that: A guide block (31) is provided at the upper end of the thrust seat (3), and a chute (32) is provided at the lower end. A groove (41) adapted to the guide block (31) is provided at the upper end of the support plate (4), and a slider (42) adapted to the chute (32) is provided at the lower end.

4. The auxiliary unlocking tool for Mueller NZM drawer type circuit breaker according to claim 1, characterized in that: The positioning member (6) is a screw.

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