Hard connecting rod type disconnecting link anti-misoperation locking mechanism

Abstract

A hard connecting rod type knife switch anti-misoperation locking mechanism is arranged between a knife switch and a grounding knife switch to enable the knife switch and the grounding knife switch not to be in a closing position at the same time and comprises two execution units, one execution unit is arranged on a main shaft of the knife switch, and the other execution unit is arranged on a main shaft of the grounding knife switch. An interlocking rod is fixedly connected between the two execution units, and linkage is achieved through the interlocking rod. When one execution unit rotates to a closing position along with the main shaft, the other execution unit is in a locking state under the action of the interlocking rod, so that the main shaft where the execution unit is located cannot rotate.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of knife switch locking device, especially relates to a hard connecting rod type combined knife switch anti -error mechanical locking device. BACKGROUND

[0002] The opening and closing equipment connected to the two sides of the circuit breaker in the power system for providing an obvious disconnection point for equipment maintenance is called a knife switch, also known as a disconnector; the equipment specially used for preventing the sudden power supply to the maintenance equipment and grounding the sides of the maintenance equipment is called a grounding knife switch. In actual application, the knife switch and the grounding knife switch are usually combined and installed to save the floor area. There are two combined forms: one, the operating mechanisms of the knife switch and the grounding knife switch are installed on the same structure; two, the operating mechanisms of the knife switch and the grounding knife switch are installed on different structures.

[0003] The mechanical locking between the knife switch and the grounding knife switch refers to the realization by using mechanical principles: the grounding knife switch is locked in the closing operation position of the knife switch; the knife switch is locked in the closing operation position of the grounding knife switch. That is, the two devices cannot be in the closing state at the same time.

[0004] Since the operating mechanisms of the two-thirds grounding knife switch and the main disconnector are in different structures, it is necessary to transmit the locking instructions for a long distance of at least 5 m, which brings great difficulties to the realization of mechanical locking.

[0005] A push rod type locking device has been used in the field, which relies on the rotation shafts of the knife switch and the grounding knife switch to drive the crescent-shaped turntable to push the connecting rod and insert it into the groove of the crescent-shaped turntable of the grounding knife switch or the knife switch, so as to hinder the rotation and form the locking. This locking device is heavy in structure and large in running resistance, and is easy to be stuck, causing damage to the motors of the knife switch and the grounding knife switch mechanisms.

[0006] Although the utility model patent with the name of "cable type combined knife switch anti-error mechanical locking device" with the number ZL 202023280594.6 solves the problem of long-distance transmission of locking instructions and does not appear to be stuck, the mechanical strength of the cable is far less than that of the hard connecting rod, so the reliability is poor.

[0007] Therefore, there is an urgent need for a new technical solution to solve this problem in the prior art. SUMMARY

[0008] In view of the deficiencies and defects of the prior art, the utility model adopts a more reliable hard connecting rod to transmit the locking instructions, the mechanical strength is guaranteed, the sticking phenomenon is not easy to appear, and the reliability is high.

[0009] The technical scheme of the utility model comprises the following steps:

[0010] The hard connecting rod type knife switch anti-misoperation locking mechanism is arranged between a knife switch and a grounding knife switch, so that the knife switch and the grounding knife switch cannot be in the closed position at the same time, and comprises two execution units, one of which is arranged on a main shaft of the knife switch, and the other of which is arranged on a main shaft of the grounding knife switch, and a locking rod is fixedly connected between the two execution units and realizes linkage through the locking rod; when one of the execution units is arranged to rotate to the closed position with the main shaft, the other execution unit is in a locked state under the action of the locking rod, so that the main shaft where the execution unit is located cannot rotate.

[0011] Further, the execution unit comprises a locking disc, a locking plate and a bottom support, the locking disc is fixedly connected with the main shaft, and an oval-shaped slide way with an opening is formed on one side of the locking disc; the locking plate is provided with an opening matched with the main shaft and a guide column matched with the oval-shaped slide way; the bottom support is fixedly connected with the main shaft and limits the locking plate, so that the oval-shaped slide way can drive the guide column to make the locking plate slide in the radial direction of the main shaft during the rotation of the locking disc with the main shaft.

[0012] Further, one end of the locking plate away from the opening is fixedly connected with the locking rod through a U-shaped screw rod.

[0013] Further, the locking rod is a hollow rod or a solid rod.

[0014] Further, the opening is a U-shaped opening, and the guide column is located on the extension line of the center line of the U-shaped opening.

[0015] The hard connecting rod type knife switch anti-misoperation locking mechanism has the following beneficial effects:

[0016] The hard connecting rod type knife switch anti-misoperation locking mechanism transmits the locking signal through a hard connecting rod, the mechanical strength is guaranteed, the phenomenon of jamming is not prone to occur, and the reliability is high. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic diagram of the utility model;

[0018] Figure 2 FIG. 2 is a structural schematic diagram of the locking disc of the utility model;

[0019] Figure 3 FIG. 3 is a structural schematic diagram of the locking plate of the utility model;

[0020] Figure 4 FIG. 4 is a position relationship schematic diagram between the locking disc and the guide column when the knife switch and the grounding knife switch are in the open state;

[0021] Figure 5 FIG. 5 is a position relationship schematic diagram between the locking disc and the guide column when the knife switch is in the closed state and the grounding knife switch is in the open state.

[0022] In the diagram, 1-interlocking disc, 2-interlocking plate, 3-interlocking rod, 4-U-shaped screw, 5-base support, 6-main shaft, 10-actuator unit, 11-elliptical slide, 21-guide column. Detailed Implementation

[0023] like Figure 1 As shown, a rigid linkage type anti-misoperation interlocking mechanism for a disconnect switch is installed between the disconnect switch and the grounding disconnect switch, preventing the disconnect switch and the grounding disconnect switch from being in the closed position simultaneously. The mechanism includes two execution units 10. One execution unit 10 is installed on the main shaft 6 of the disconnect switch, and the other execution unit 10 is installed on the main shaft 6 of the grounding disconnect switch. The two execution units 10 are fixedly connected by an interlocking rod 3, and are linked together through the interlocking rod 3. When one execution unit 10 is rotated with the main shaft 6 to the closed position of the disconnect switch / grounding disconnect switch, the other execution unit 10 is locked under the action of the interlocking rod 3, so that the main shaft 6 where the execution unit 10 is located cannot rotate, thereby achieving the purpose of preventing the disconnect switch and the grounding disconnect switch from being in the closed position simultaneously.

[0024] Specifically, such as Figure 2 and Figure 3 As shown, each execution unit 10 includes an interlocking disc 1, an interlocking plate 2, and a base 5. The interlocking disc 1 is fixedly connected to the main shaft 6, and one side of it forms an elliptical slide 11 with an opening. The opening has a certain length and a width slightly larger than the diameter of the guide post 21. The interlocking plate 2 has a notch adapted to the main shaft 6 and a guide post 21 that cooperates with the elliptical slide 11. The base 5 is fixedly connected to the main shaft 6 and serves to limit the position of the interlocking plate 2. It should be noted that the base 5 is a ring-shaped part, which is sleeved on the main shaft 6. The fixing and relative position adjustment between the base 5 and the main shaft 6 are achieved by a set screw threaded to the ring wall.

[0025] It is understood that the interlocking plate 2 is located between the interlocking disc 1 and the base 5. The guide post 21 on the interlocking plate 2 is connected to the elliptical slide 11 with an opening on the interlocking disc 1. The notch on the interlocking plate 2 accommodates the main shaft 6. The base 5 contacts the interlocking plate 2 and limits the position of the interlocking plate 2 in the axial direction. As the interlocking disc 1 rotates with the main shaft 6, the elliptical slide 11 can drive the guide post 21, thereby causing the interlocking plate 2 to slide in the radial direction of the main shaft 6.

[0026] As mentioned above, the two execution units 10 are linked by the interlocking rod 3. The more specific connection relationship is as follows: the two ends of the interlocking rod 3 are connected to the ends of the interlocking plates 2 of the two execution units 10 away from the notch by U-shaped screws 4 respectively. The two ends of the U-shaped screws 4 pass through the interlocking plates 2 and are fastened by nuts.

[0027] Preferably, the interlocking rod 3 is a hollow rod or a solid rod, and the material can be metal, hard plastic or carbon fiber.

[0028] Preferably, the notch is a U-shaped notch, and the guide post 21 is located on the extension line of the center line of the U-shaped notch.

[0029] Working principle:

[0030] like Figure 4 and Figure 5 As shown, when both the disconnect switch on the left and the grounding disconnect switch on the right are in the open state, the guide posts 21 of the interlocking plates 2 of the two execution units 10 are located on the opening side of the elliptical slide rail 11 of the interlocking disc 1 and are flush with it. At this time, both the disconnect switch and the grounding disconnect switch can be closed. In this embodiment, we take the closing of the disconnect switch as an example to illustrate the working principle of this utility model. When the main shaft 6 of the disconnect switch on the left rotates, the interlocking disc 1, which is fixedly connected to the main shaft, also rotates. The interlocking plate 2 on the disconnect switch side moves synchronously to the left under the action of the elliptical track. When the interlocking disc 1 rotates 180° with the main shaft 6, the disconnect switch completes the closing operation. At this time, the guide post 21 on the interlocking plate 2 on the grounding disconnect switch side slides exactly to the center of the opening of the elliptical slide 11 on the interlocking disc 1 on that side. The relative position of the interlocking plate 2 on the interlocking disc 1 on the grounding disconnect switch side is limited by the guide post 21, thereby preventing the main shaft 6 of the grounding disconnect switch from rotating, thus achieving the purpose that the disconnect switch and the grounding disconnect switch cannot be in the closed position at the same time.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any equivalent substitutions and modifications made by those skilled in the art without departing from the guidance of the present utility model shall be deemed to fall within the protection scope of the present utility model.

Claims

1. A hard link type knife switch misoperation prevention locking mechanism, which is provided between a knife switch and a grounding knife switch so that the knife switch and the grounding knife switch cannot be in the closed position at the same time, characterized in that: The device comprises two execution units (10), one execution unit (10) is arranged on the main shaft (6) of the knife switch, and the other execution unit (10) is arranged on the main shaft (6) of the grounding knife switch, the interlocking rod (3) is fixedly connected between the two execution units (10) and linkage is realized through the interlocking rod (3); when one of the execution units (10) is arranged to rotate with the main shaft (6) to the closed position, the other execution unit (10) is in the locked state under the action of the interlocking rod (3), so that the main shaft (6) where the execution unit (10) is arranged cannot rotate; ​ The execution unit (10) comprises an interlocking disc (1), an interlocking plate (2) and a bottom support (5), the interlocking disc (1) is fixedly connected with the main shaft (6), and an oval slide (11) with an opening is formed on one side of the interlocking disc (1); The interlocking plate (2) is provided with an opening matched with the main shaft (6) and a guide column (21) matched with the oval slide (11); the bottom support (5) is fixedly connected with the main shaft (6) and limits the interlocking plate (2), so that the oval slide (11) can drive the guide column (21) and the interlocking plate (2) slides in the radial direction of the main shaft (6) during the rotation of the main shaft (6).

2. The hard- wired knife gate anti- mislock mechanism of claim 1, wherein: One end of the interlocking plate (2) away from the opening is fixedly connected with the interlocking rod (3) through the U-shaped screw rod (4).

3. The hard- wired knife gate anti- mislock mechanism of claim 1, wherein: The interlocking rod (3) is a hollow rod or a solid rod.

4. The hard- wired knife gate anti- mislock mechanism of claim 1, wherein: The opening is a U-shaped opening, and the guide column (21) is located on the extension line of the center line of the U-shaped opening.

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