Mechanical interlocking device and circuit breaker interlocking system with same

Abstract

The utility model discloses a mechanical interlocking device and a circuit breaker interlocking system with the mechanical interlocking device, and belongs to the technical field of low-voltage electric appliances. The mechanical interlocking device comprises a support and a sliding block arranged on the support. The bracket is provided with a sliding block sliding guide device, the sliding block is provided with a handle limiting part for limiting a handle of the circuit breaker to move towards the switching-on direction, and the sliding block is arranged in the sliding block sliding guide device and slides along the direction vertical to the switching-on and switching-off direction of the circuit breaker. The transmission piece is rotationally installed on the support and connected with the sliding block so as to be in linkage with the sliding block. The circuit breaker interlocking system comprises three circuit breakers, a first cable, a second cable, a third cable and a mechanical interlocking device. The circuit breaker interlocking device has the advantages that the interlocking requirement of circuit breakers with different shell frame grades can be met, and two or more circuit breakers can be installed at any position and simultaneously interlocked.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and particularly relates to a mechanical interlock device, and also relates to a breaker interlock system with the mechanical interlock device. Background Art

[0002] The mechanical interlock of a breaker is an interlock measure to prevent two or more breakers from being in the closed position at the same time, and is usually used in occasions where only one power supply can be reliably powered in a multi-power supply system. The multi-power supply occasion is essentially an occasion with extremely high requirements for power supply reliability.

[0003] With the rapid development of the modernization process, there are more and more occasions requiring emergency standby power supplies, and at the same time, the requirements for emergency standby power supplies are becoming more and more stringent. In the design of an automatic control system, although the electrical interlock between breakers of different power supplies can be realized by means of auxiliary switches of breakers or other electrical components, in order to meet relevant standards, the main switch of the automatic generator control panel is required by the power supply department to have a mechanical interlock function, so as to ensure absolute safety in any case, that is, to fully ensure the safety of equipment, power supply and personnel, and prevent safety problems caused by operation errors or equipment failures. More specifically, the main switch has a mechanical interlock, which can ensure that only one main switch is in the working state during operation, and prevent the problem of losing safety due to operating two main switches at the same time. In addition, in the case where the power supply must be switched manually, such as switching from the normal power supply to the standby power supply or from the standby power supply to the normal power supply, the mechanical interlock of the breaker is also crucial. However, the installation requirements of the mechanical interlock in the existing technology are relatively harsh and cannot be applied to all situations and occasions. This is mainly because although the traditional mechanical interlock method is effective, it is powerless for pure mechanical operations (such as directly using the mechanical closing mechanism of the breaker). This means that in some specific operating environments, relying solely on the mechanical interlock cannot provide sufficient protection, and it is necessary to add a mechanical interlock on the basis of the electrical interlock to ensure absolute reliability.

[0004] The structural forms of the devices involved in the above mechanical interlock, that is, the mechanical interlock devices, are mainly of two types: one is the bolt-type mechanical interlock; the other is the steel cable-type mechanical interlock. In the existing technology, the CM series mechanical interlock is generally a bolt-type (i.e., "gate-type") mechanical interlock, and its working mechanism is: when the breaker is closed, the deflector deflects with the closing half shaft, and the stopper is driven by the drive shaft of another breaker to unfold. In this way, when one breaker is in the closed state, the operation of another breaker is restricted, thus reflecting the aforementioned bolt-type mechanical interlock function. Since the installation of the bolt-type mechanical interlock method is relatively troublesome, and due to the limitation of the slider size, it is necessary to require two breakers of the same frame to be close to a certain fixed distance for installation, so it is limited by both the frame and the distance, lacking the flexibility of installation. Summary of the Utility Model

[0005] The object of the present utility model is to provide a mechanical interlock device that can not only meet the interlock requirements between circuit breakers of different frame ratings, but also embody the installation of more than two circuit breakers at any position and simultaneous interlock, and a circuit breaker interlock system with such a mechanical interlock device.

[0006] The object of the present utility model is achieved as follows. A mechanical interlock device includes a bracket and a slider placed on the bracket. A slider sliding guiding device is provided on the bracket, and a handle limiting part for restricting the movement of the circuit breaker handle in the closing direction is provided on the slider. The slider is placed in the slider sliding guiding device and slides perpendicular to the opening and closing direction of the circuit breaker. The feature is that the mechanical interlock device further includes a transmission member, a cable traction plate connected to the cable is provided on the transmission member, and the transmission member is rotatably installed on the bracket and connected to the slider to be linked with the slider.

[0007] In a specific embodiment of the present utility model, the slider sliding guiding device includes an upper guiding and limiting claw and a lower guiding and limiting claw. The upper and lower guiding and limiting claws correspond to each other, and the space between the facing sides of the upper and lower guiding and limiting claws constitutes a guiding space. The slider is slidably arranged in the guiding space, and the upper side surface of the slider and the lower side surface of the upper guiding and limiting claw form a sliding pair, while the lower side surface of the slider and the upper side surface of the lower guiding and limiting claw form a sliding pair. Among them, the upper guiding and limiting claw is a whole part with a cross-sectional shape of ┐ or a plurality of parts with the same ┐-shaped cross-sectional shape spaced apart from each other, and the lower guiding and limiting claw is a whole part with a cross-sectional shape of ┌ or a plurality of parts with the same ┌-shaped cross-sectional shape spaced apart from each other.

[0008] In another specific embodiment of the present utility model, a kidney-shaped hole is formed in the transmission member, and a riveting hole is formed in the slider at a position corresponding to the kidney-shaped hole. After a short shaft passes through the kidney-shaped hole and the riveting hole in sequence, the transmission member and the slider are riveted and connected, and the transmission member and the slider are linked at a position corresponding to the kidney-shaped hole through the short shaft.

[0009] In yet another specific embodiment of the present utility model, a slider through hole is formed in the transmission member, a bracket riveting hole is formed in the bracket at a position corresponding to the slider through hole, and a bushing is placed on the bracket as a carrier at a position above the bracket riveting hole. After a pin shaft passes through the slider through hole, the bushing, and the bracket riveting hole in sequence, the transmission member, the bushing, and the bracket are riveted and connected, and the transmission member rotates concentrically around the bracket riveting hole formed in the bracket.

[0010] In another specific embodiment of the present invention, the interlocking system includes two circuit breakers, a first cable and a mechanical interlocking device, wherein the mechanical interlocking devices are respectively installed on the two circuit breakers, one end of the first cable is connected to a cable traction plate on a transmission member on the mechanical interlocking device of the first circuit breaker, and the other end of the first cable is connected to a cable traction plate on a transmission member on the mechanical interlocking device of the second circuit breaker.

[0011] In another specific embodiment of the utility model, the interlocking system includes three circuit breakers, a first cable, a second cable and a mechanical interlocking device, and the mechanical interlocking devices are respectively installed on the three circuit breakers, one end of the first cable is connected to the cable traction plate on the transmission member on the mechanical interlocking device of the first circuit breaker, and the other end is connected to the cable traction plate on the transmission member on the mechanical interlocking device of the second circuit breaker; one end of the second cable is connected to the cable traction plate on the transmission member on the mechanical interlocking device of the second circuit breaker, and the other end is connected to the cable traction plate on the transmission member on the mechanical interlocking device of the third circuit breaker.

[0012] In a more specific embodiment of the present utility model, the interlocking system includes three circuit breakers, a first cable, a second cable, a third cable and a mechanical interlocking device, wherein the mechanical interlocking devices are respectively installed on the three circuit breakers, one end of the first cable is connected to the cable traction plate on the transmission member on the mechanical interlocking device of the first circuit breaker, and the other end is connected to the cable traction plate on the transmission member on the mechanical interlocking device of the second circuit breaker; one end of the second cable is connected to the cable traction plate on the transmission member on the mechanical interlocking device of the second circuit breaker, and the other end is connected to the cable traction plate on the transmission member on the mechanical interlocking device of the third circuit breaker; one end of the third cable is connected to the cable traction plate on the transmission member on the mechanical interlocking device of the first circuit breaker, and the other end is connected to the cable traction plate on the transmission member on the mechanical interlocking device of the third circuit breaker.

[0013] The technical effect of the technical solution provided by the utility model is that: since an integrally fixed fixed slider in the prior art is designed into separate and linked transmission members and sliders, and the corresponding bracket structure can be designed separately for different shell frames, it can not only meet the interlocking requirements between circuit breakers of different shell frame levels, but also realize that two or more circuit breakers can be installed at any position and interlocked at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional organizational structure diagram of the mechanical interlocking device of the utility model;

[0015] Figure 2 for Figure 1 A schematic diagram of a cable traction plate of the transmission member shown;

[0016] Figure 3 Schematic diagram of the first application example of the present utility model;

[0017] Figure 4 Schematic diagram of the second application example of the present utility model;

[0018] Figure 5 Schematic diagram of the third application example of the present utility model. Detailed implementation manners

[0019] The following will describe in detail the specific implementation manners of the present utility model in conjunction with the accompanying drawings. However, the description of the embodiments does not limit the technical solutions. Any change in form rather than in essence based on the inventive concept of the present invention should be regarded as within the protection scope of the present invention.

[0020] In the following description, the directional (or positional) concepts of up, down, left, right, front, and back are based on the Figure 1 position state shown, for the convenience of public understanding. Therefore, it should not be construed as a special limitation on the technical solutions provided by the present utility model.

[0021] Please refer to Figure 1 , Figure 1 which shows an interlocking device, including a bracket 7 and a slider 5 placed on the bracket 7; a slider sliding guiding device 71 is provided on the bracket 7, a handle limiting portion 52 for restricting the movement of the circuit breaker handle in the closing direction is provided on the slider 5, and the slider 5 is placed in the slider sliding guiding device 71 and slides perpendicular to the opening and closing direction of the circuit breaker.

[0022] As the technical key points of the technical solutions provided by the present utility model: the mechanical interlocking device further includes a transmission member 4, on which a cable traction plate 43 connected to a cable is provided. The transmission member 4 is rotatably installed on the bracket 7 and is connected to the slider 5 so as to be linked with the slider 5.

[0023] Continue to refer to Figure 1, the aforementioned slider sliding guiding device 71 includes an upper guiding and limiting claw 711 and a lower guiding and limiting claw 712. The upper and lower guiding and limiting claws 711, 712 correspond to each other, and the space between the facing sides of the upper and lower guiding and limiting claws 711, 712 constitutes a guiding space 713. The aforementioned slider 5 is slidably disposed within the guiding space 713, and the upper side surface of the slider 5 and the lower side surface of the upper guiding and limiting claw 711 form a sliding pair, while the lower side surface of the slider 5 and the upper side surface of the lower guiding and limiting claw 712 form a sliding pair. Among them, the upper guiding and limiting claw 711 is an integral component with a cross-sectional shape in the form of a ┐ character or a plurality of components spaced apart from each other with the same cross-sectional shape in the form of a ┐ character, and the lower guiding and limiting claw 712 is an integral component with a cross-sectional shape in the form of a ┌ character or a plurality of components spaced apart from each other with the same cross-sectional shape in the form of a ┌ character.

[0024] In this embodiment, there is a pair of the aforementioned lower and upper guiding and limiting claws 711, 712 corresponding to each other vertically. Of course, from the above settings, it can be seen that the lower and upper guiding and limiting claws 711, 712 can also be a single elongated one corresponding to each other.

[0025] Still referring to Figure 1 , a kidney-shaped hole 41 (also referred to as an "elliptical hole") is formed in the aforementioned transmission member 4, and a riveting hole 51 is formed in the aforementioned slider 5 at a position corresponding to the kidney-shaped hole 41. The transmission member 4 and the slider 5 are riveted and connected by the short shaft 2 passing through the kidney-shaped hole 41 and the riveting hole 51 in sequence, and the rotation of the transmission member 4 is driven by the sliding of the slider 5 through the short shaft 2 at a position corresponding to the kidney-shaped hole 41, or the sliding of the slider 5 is driven by the rotation of the transmission member 4 through the short shaft 2 at a position corresponding to the kidney-shaped hole 41. Of course, the positions of the kidney-shaped hole on the transmission member 4 and the riveting hole on the slider 5 can be interchanged.

[0026] A slider through-hole 42 is formed in the aforementioned transmission member 4, a bracket riveting hole 72 is formed in the aforementioned bracket 7 at a position corresponding to the slider through-hole 42, and a bushing 6 is placed on the carrier of the bracket 71 at a position above the bracket riveting hole 72. The transmission member 4, the bushing 6, and the bracket 7 are riveted and connected by the pin shaft 3 passing through the slider through-hole 42, the bushing 6, and the bracket riveting hole 72 in sequence, and the transmission member 4 rotates concentrically around the aforementioned bracket riveting hole 72 formed in the bracket 7.

[0027] Please refer to Figure 2 And in combination with Figure 1 , the aforementioned transmission member 4 has a cable traction plate 43, and a cable traction ball head introduction hole 431 and a pair of cable traction holes 432 are formed in the cable traction plate 43 (see Figure 2As shown), the cable traction ball head inlet hole 431 and the cable traction hole 432 communicate with each other through the traction hole transition channel 433. Figure 1 As shown, a ball head 11 is formed on the cable 1 and at the end of the cable 1. The ball head 11 passes through the cable traction ball head inlet hole 431 and then slides into the cable traction hole 432 through the aforementioned traction transition channel 433.

[0028] According to Figure 2 As can be seen from the schematic diagram, the inner diameter of the above-mentioned cable traction ball head inlet hole 431 must be slightly larger than the outer diameter of the ball head 11 of the cable 1 structure system shown by Figure 1 and Figure 2 so as to ensure that after the ball head 11 passes through the cable traction ball head inlet hole 431, the narrow neck behind the ball head 11, that is, the cable core smaller than the diameter of the ball head 11, enters the cable traction hole 432 through the traction hole transition channel 433. In addition, in this embodiment, there are a pair of the aforementioned cable traction holes 432, but it can also be one. When it is one, it is located at the right end of the horizontal traction hole transition channel 433 in the position state shown by Figure 2 and corresponds to the cable traction ball head inlet hole 431. Therefore, in this embodiment, since there are a pair of cable traction holes 432, the shape of the aforementioned traction hole transition channel 433 is T-shaped. On the contrary, when there is one cable traction hole 432, the shape of the traction hole transition channel 433 is a horizontal straight line (taking the position state where Figure 2 is located as an example).

[0029] Still referring to Figure 1 , on the aforementioned bracket 7 and at a position corresponding to the connection of the end of the aforementioned cable 1, a connection frame 73 perpendicular to the bracket 1 is formed. On the connection frame 73, one or, as in this embodiment, a plurality of, that is, two, threaded stud mating holes 731 spaced apart from top to bottom are provided. A threaded stud 12 is provided at the end of the cable 1, and the threaded stud 12 is connected to the connection frame 73 at a position corresponding to the threaded stud mating hole 731.

[0030] As shown by Figure 1 , a threaded stud control nut 121 for locking or unlocking the threaded stud 12 with the threaded stud mating hole 731 of the connection frame 73 is provided on the aforementioned threaded stud 12.

[0031] On the right side of the aforementioned slider 5, a handle limiting portion 52 is folded upwards, and a sheath 521 for preventing injury, such as cutting the operator's hand, is sleeved on the handle limiting portion 52. The sheath 521 is a plastic sleeve, but it can also be a sheath 521 made of other equivalent materials.

[0032] The height and width of the foregoing guide sliding space 713 are adapted to the thickness and width of the foregoing slider 5; when the foregoing upper guide sliding limit claws 711 and lower guide sliding limit claws 712 are each a plurality of spaced-apart components, the shapes of the upper guide sliding limit claws 711 and lower guide sliding limit claws 712 are in the shape of bent fingers (i.e., in the shape of the end joint of a thumb bent at 90° like one finger).

[0033] Application Example 1:

[0034] Taking the interlock of two circuit breakers as an example, the interlock system includes two circuit breakers, a first cable 1, and two identical mechanical interlock devices. The mechanical interlock devices are respectively installed on the two circuit breakers. One end of the first cable 1 is connected to the cable traction plate 43 on the transmission member 4 of the mechanical interlock device on the first circuit breaker, and the other end is connected to the cable traction plate 43 on the transmission member 4 of the mechanical interlock device on the second circuit breaker.

[0035] Please refer to Figure 3 And in combination with Figure 1 , the two mechanical interlock devices are respectively installed on the two circuit breakers. One end of the first cable 1 is connected to the cable traction plate 43 on the transmission member 4 of the mechanical interlock device on the first circuit breaker 8a, and the other end is connected to the cable traction plate 43 on the transmission member 4 of the mechanical interlock device on the second circuit breaker 8b. Since the length of the steel wire in the cable 1 is fixed, and the lengths of the steel wires at both ends of the ball head 11 in the cable 1 extending out of the threaded post 12 are also fixed, when one end of the steel wire elongates, the other end must shorten. When the second circuit breaker 8b (which can be considered as the normal power supply) is in the closed state, the handle limiting part 52 on the slider 5 of the mechanical interlock device installed on the second circuit breaker 8b is toggled, and the slider 5 of the mechanical interlock device on the second circuit breaker 8b slides to the left, driving the transmission member 4 to rotate counterclockwise and driving the steel wire in the cable 1 to elongate towards the second circuit breaker 8b side through the ball head 11, and at the same time driving Figure 4 the movement of the steel wire in the cable 1 on the side of the first circuit breaker 8a (which can also be considered as the standby power supply) in the position state shown, specifically: the ball head 11 at the left end of the cable 1 drives the transmission member 4 on the mechanical interlock device on the first circuit breaker 8a to rotate clockwise, and at the same time the transmission member 4 drives the slider 5 on the side of the first circuit breaker 8a to move towards the closing position of the first circuit breaker 8a handle and stay at the closing position of the first circuit breaker 8a handle, restricting the rotation movement of the circuit breaker handle 81a of the first circuit breaker 8a to the closing position, and the first circuit breaker 8a cannot be closed, preventing Figure 4 the first circuit breaker 8a in the position state shown from being closed and connected simultaneously with the second circuit breaker 8b in the closed state shown. When it is necessary to close the first circuit breaker 8a shown in Figure 3 the position state shown, first Figure 3 the first circuit breaker 8a shown, first Figure 3The circuit breaker handle 81b of the second circuit breaker 8b in the shown position state is turned to the circuit breaker tripping position, and the handle limiting part 52 on the slider 5 of the mechanical interlock device on the first circuit breaker 8a is toggled. The slider 5 of the first circuit breaker 8a slides to Figure 3 the left side of the first circuit breaker 8a in the shown position state, driving the transmission part 4 to rotate counterclockwise and driving the steel wire in the cable 1 to extend towards the first circuit breaker 8a through the ball head 11. At the same time, it drives the steel wire in the cable 1 on the side of the second circuit breaker 8b. The right ball head 11 on the cable 1 drives the transmission part 4 on the mechanical interlock device on the second circuit breaker 8b to rotate clockwise. At the same time, the transmission part 4 drives Figure 4 the slider 5 on the mechanical interlock device on the second circuit breaker 8b shown to move towards the closing position of the second circuit breaker 8b and stay at the closing position of the circuit breaker handle 81b of the second circuit breaker 8b, restricting the rotational movement of the circuit breaker handle 81b to the closing position, and the second circuit breaker 8b cannot be closed. This prevents the first circuit breaker 8a from closing and connecting the second circuit breaker 8b simultaneously when the first circuit breaker 8a is in the closed state.

[0036] Application Example 2:

[0037] An embodiment of the interlock of three circuit breakers. The interlock system includes three circuit breakers, a first cable 1, a second cable 1a, and three identical mechanical interlock devices. The mechanical interlock devices are respectively installed on the three circuit breakers. One end of the first cable 1 is connected to the cable traction plate 43 on the transmission part 4 of the mechanical interlock device of the first circuit breaker 8a, and the other end is connected to the cable traction plate 43 on the transmission part 4 of the mechanical interlock device of the second circuit breaker 8b; one end of the second cable 1a is connected to the cable traction plate 43 on the transmission part 4 of the mechanical interlock device of the second circuit breaker 8b, and the other end is connected to the cable traction plate 43 on the transmission part 4 of the mechanical interlock device of the third circuit breaker 8c.

[0038] Please refer to Figure 4 , the first circuit breaker 8a and the third circuit breaker 8c are the main power supplies, and the second circuit breaker 8b in the middle is the standby power supply. The three circuit breakers on the left, in the middle, and on the right are allowed to be in the tripped and disconnected state simultaneously, or when the second circuit breaker 8b in the middle is closed and connected, the first circuit breaker 8a and the third circuit breaker 8c cannot be closed and connected. When the circuit breaker handles 81c of the first circuit breaker 8a and the third circuit breaker 8c are in the closed and connected state, then the second circuit breaker 8b in the middle cannot be closed and connected. The operation method of the above mechanical interlock is the same as above.

[0039] Application Example 3:

[0040] Another embodiment of the interlock for three circuit breakers. The interlock system includes three circuit breakers, a first cable 1, a second cable 1a, a third cable 1b, and three identical mechanical interlock devices. The mechanical interlock devices are respectively installed on the three circuit breakers. One end of the first cable 1 is connected to the cable traction plate 43 on the transmission member 4 of the mechanical interlock device of the first circuit breaker 8a, and the other end is connected to the cable traction plate 43 on the transmission member 4 of the mechanical interlock device of the second circuit breaker 8b. One end of the second cable 1a is connected to the cable traction plate 43 on the transmission member 4 of the mechanical interlock device of the second circuit breaker 8b, and the other end is connected to the cable traction plate 43 on the transmission member 4 of the mechanical interlock device of the third circuit breaker 8c. One end of the third cable 1b is connected to the cable traction plate 43 on the transmission member 4 of the mechanical interlock device of the first circuit breaker 8a, and the other end is connected to the cable traction plate 43 on the transmission member 4 of the mechanical interlock device of the third circuit breaker 8c.

[0041] Please refer to Figure 5 , the first circuit breaker 8a, the second circuit breaker 8b, and the third circuit breaker 8c are all common power sources. The three circuit breakers are allowed to be in the open and disconnected state at the same time. When any one of the three circuit breakers is closed and connected, the other two circuit breakers cannot be closed and connected.

[0042] The cable ball heads 11 described in the above embodiment are respectively installed corresponding to the cable traction holes 432 on the cable traction plate 43.

[0043] In summary, the mechanical interlock device for circuit breakers provided by the present invention can realize the installation of two or three circuit breakers with the same or different frame sizes at any position, and the installation is convenient, greatly improving the flexibility.

[0044] In summary, the present invention designs the fixed slider in the prior art into a linkage scheme of the slider and the transmission member. Different brackets 7 can be separately designed for different frame sizes of the circuit breaker, which can not only realize the interlock of circuit breakers with different frame levels, but also realize the installation of two or more circuit breakers at any position and interlock them at the same time. It is an excellent solution.

Claims

1. A mechanical interlock device, comprising a bracket (7) and a slider (5) placed on the bracket (7); a slider sliding guide device (71) is provided on the bracket (7), a handle limit part (52) for restricting the movement of the circuit breaker handle in the closing direction is provided on the slider (5), the slider (5) is placed in the slider sliding guide device (71) and slides perpendicular to the opening and closing direction of the circuit breaker, and it is characterized in that: The mechanical interlocking device further includes a transmission member (4). A cable traction plate (43) connected to the cable is provided on the transmission member (4). The transmission member (4) is rotatably installed on a bracket (7) and connected to the slider (5) so as to be interlocked with the slider (5).

2. The mechanical interlock device according to claim 1, characterized in that: The slider sliding guide device (71) includes an upper guide and limit claw (711) and a lower guide and limit claw (712). The upper and lower guide and limit claws (711, 712) correspond to each other, and the space between the facing sides of the upper and lower guide and limit claws (711, 712) constitutes a guide space (713). The slider (5) is slidably disposed in the guide space (713), and the upper side surface of the slider (5) and the lower side surface of the upper guide and limit claw (711) form a sliding pair, while the lower side surface of the slider (5) and the upper side surface of the lower guide and limit claw (712) form a sliding pair. Among them, the upper guide and limit claw (711) is a whole member with a cross-sectional shape in the shape of ┐ or a plurality of members spaced apart from each other with the same cross-sectional shape in the shape of ┐, and the lower guide and limit claw (712) is a whole member with a cross-sectional shape in the shape of ┌ or a plurality of members spaced apart from each other with the same cross-sectional shape in the shape of ┌.

3. A mechanical interlocking device according to claim 1, characterized in that: A kidney-shaped hole (41) is formed in the transmission member (4), and a riveting hole (51) is formed in the slider (5) at a position corresponding to the kidney-shaped hole (41). The transmission member (4) and the slider (5) are riveted and connected by a short shaft (2) passing through the kidney-shaped hole (41) and the riveting hole (51) in sequence, and the transmission member (4) and the slider (5) are interlocked at a position corresponding to the kidney-shaped hole (41) through the short shaft (2).

4. A mechanical interlocking device according to claim 1, wherein: A slider through hole (42) is formed in the transmission member (4), and a bracket riveting hole (72) is formed in the bracket (7) at a position corresponding to the slider through hole (42). A bushing (6) is placed on the bracket (7) as a carrier at a position above the bracket riveting hole (72). The transmission member (4), the bushing (6) and the bracket (7) are riveted and connected by a pin shaft (3) passing through the slider through hole (42), the bushing (6) and the bracket riveting hole (72) in sequence, and the transmission member (4) rotates concentrically around the bracket riveting hole (72) formed in the bracket (7).

5. A circuit breaker interlock system having the mechanical interlock device as described in claim 1, characterized in that: The interlocking system includes two circuit breakers, a first cable (1) and a mechanical interlocking device. The mechanical interlocking device is respectively installed on the two circuit breakers. One end of the first cable (1) is connected to the cable traction plate (43) on the transmission member (4) of the mechanical interlocking device of the first circuit breaker, and the other end is connected to the cable traction plate (43) on the transmission member (4) of the mechanical interlocking device of the second circuit breaker.

6. A circuit breaker interlock system having the mechanical interlock device as claimed in claim 1, characterized in that: The interlocking system includes three circuit breakers, a first cable (1), a second cable (1a), and a mechanical interlocking device. The mechanical interlocking device is respectively installed on the three circuit breakers. One end of the first cable (1) is connected to a cable traction plate (43) on a transmission member (4) of the mechanical interlocking device of the first circuit breaker, and the other end is connected to a cable traction plate (43) on a transmission member (4) of the mechanical interlocking device of the second circuit breaker; One end of the second cable (1a) is connected to a cable traction plate (43) on a transmission member (4) of the mechanical interlocking device of the second circuit breaker, and the other end is connected to a cable traction plate (43) on a transmission member (4) of the mechanical interlocking device of the third circuit breaker.

7. A circuit breaker interlock system having the mechanical interlock device as claimed in claim 1, characterized in that: The interlocking system includes three circuit breakers, a first cable (1), a second cable (1a), a third cable (1b), and a mechanical interlocking device. The mechanical interlocking device is respectively installed on the three circuit breakers. One end of the first cable (1) is connected to a cable traction plate (43) on a transmission member (4) of the mechanical interlocking device of the first circuit breaker, and the other end is connected to a cable traction plate (43) on a transmission member (4) of the mechanical interlocking device of the second circuit breaker; One end of the second cable (1a) is connected to a cable traction plate (43) on a transmission member (4) of the mechanical interlocking device of the second circuit breaker, and the other end is connected to a cable traction plate (43) on a transmission member (4) of the mechanical interlocking device of the third circuit breaker. One end of the third cable (1b) is connected to a cable traction plate (43) on a transmission member (4) of the mechanical interlocking device of the first circuit breaker, and the other end is connected to a cable traction plate (43) on a transmission member (4) of the mechanical interlocking device of the third circuit breaker.

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