Interlocking mechanism of an electric earthing switch and electric earthing switch

Abstract

The present invention discloses an interlocking mechanism for an electric earthing switch, which includes a first connecting rod, a second connecting rod, a crank arm, a rotating shaft, an interlocking stop block, an elastic member, a small flap and a switching element; one end of the first connecting rod is provided with a first strip-shaped groove, one end of the second connecting rod is provided with a second strip-shaped groove, one end of the crank arm is slidably disposed in the first strip-shaped groove and the second strip-shaped groove, the other end of the crank arm is connected to one end of the rotating shaft, the other end of the rotating shaft is connected to the interlocking stop block through a transmission mechanism, the other end of the first connecting rod is hinged to the operating shaft of the electric earthing switch, the other end of the second connecting rod is connected to the top end of the small flap, one end of the elastic member is connected to the top end of the small flap for pulling the small flap upward to block the operating hole of the operating shaft; the switching element is located below the small flap and is used for acting by being pressed by the small flap when the small flap is pulled downward to cut off the electric circuit of the electric earthing switch. The present invention has the advantages of simple structure, reliable interlocking safety, etc.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of earthing switches, and particularly relates to an interlocking mechanism for an electric earthing switch and an electric earthing switch. Background Art

[0002] With the rapid development of social economy, the requirement for automated operation is getting higher and higher, and electric earthing switches are more and more widely used. It is extremely necessary to solve the interlocking problem of electric earthing switches. However, the current interlocking mechanism has a complex structure and weak functionality. The current interlocking mechanism is that after the earthing switch is closed, the sector piece on the main shaft presses the small flap so that it is not pulled upward by the torsion spring on the interlocking shaft, so as to achieve the purpose of the interlocking block extending into the cabinet to achieve interlocking. However, the small flap needs to be manually pressed down to the bottom before the earthing switch can be closed to press the small flap. In addition, no corresponding priority is set for electric and manual operations. Therefore, the current interlocking mechanism has certain defects when applied to electric earthing switches. Summary of the Invention

[0003] The technical problem to be solved by the present invention lies in: aiming at the problems existing in the prior art, the present invention provides an interlocking mechanism for an electric earthing switch and an electric earthing switch with a simple structure, reliable interlocking and safety.

[0004] To solve the above technical problems, the technical solution proposed by the present invention is:

[0005] An interlocking mechanism for an electric earthing switch, comprising a first connecting rod, a second connecting rod, a crank arm, a rotating shaft, an interlocking block, an elastic member, a small flap and a switch element; one end of the first connecting rod is provided with a first strip-shaped groove, one end of the second connecting rod is provided with a second strip-shaped groove, one end of the crank arm is slidably arranged in the first strip-shaped groove and the second strip-shaped groove, the other end of the crank arm is connected to one end of the rotating shaft, the other end of the rotating shaft is connected to the interlocking block through a transmission mechanism, the other end of the first connecting rod is hinged to the operating shaft of the electric earthing switch, the other end of the second connecting rod is connected to the top end of the small flap, and one end of the elastic member is connected to the top end of the small flap for pulling the small flap upward to block the operating hole of the operating shaft; the switch element is located below the small flap and is used for acting by being pressed by the small flap when the small flap is pulled downward to cut off the electric circuit of the electric earthing switch.

[0006] As a further improvement of the above technical solution:

[0007] A torsion member is provided between the transmission mechanism and the rotating shaft for driving the rotating shaft to rotate and then driving the crank arm to be in a natural position.

[0008] The torsion member is a torsion spring.

[0009] An actuating ram is provided between the small valve and the switch element. One end of the ram abuts against the bottom end of the small valve, and the other end abuts against the switch element.

[0010] The elastic member is a spring.

[0011] The switch element is a travel switch.

[0012] The transmission mechanism is a gear-rack transmission mechanism, a ball screw assembly, a crank-slider assembly, etc.

[0013] The present invention also discloses an electric earthing switch, which includes an operating shaft and the interlocking mechanism of the electric earthing switch as described above.

[0014] Compared with the prior art, the advantages of the present invention are as follows:

[0015] For the interlocking mechanism of the electric earthing switch and the electric earthing switch of the present invention, after the electric earthing switch is electrically closed, through the transmission of the first connecting rod, the toggle arm, the rotating shaft and the transmission mechanism, the interlocking baffle extends into the cabinet body and abuts against the baffle of the trolley, so as to prevent the circuit breaker from entering the working position; during electric operation and manual operation, the travel switch can be triggered through the small valve and then the ram, so as to avoid simultaneous electric operation and prevent safety accidents; the overall structure is simple and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the interlocking mechanism of the present invention in an embodiment.

[0017] Figure 2 It is a schematic structural diagram of the first connecting rod of the present invention in an embodiment.

[0018] Figure 3 It is a schematic structural diagram of the second connecting rod of the present invention in an embodiment.

[0019] Legend: 1, first connecting rod; 101, first strip-shaped groove; 2, second connecting rod; 201, second strip-shaped groove 201; 3, toggle arm; 4, rotating shaft; 5, torsion spring; 6, transmission mechanism; 7, interlocking block; 8, elastic member; 9, switch element; 10, ram; 11, small valve; 12, operating shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present invention will be further described below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0021] As Figure 1As shown in the figure, the interlocking mechanism of the electric earthing switch according to the embodiment of the present invention includes a first connecting rod 1, a second connecting rod 2, a crank arm 3, a rotating shaft 4, an interlocking stopper 7, an elastic member 8 (such as a spring) and a switch element 9 (such as a travel switch); one end of the first connecting rod 1 is provided with a first strip-shaped groove 101, one end of the second connecting rod 2 is provided with a second strip-shaped groove 201, one end of the crank arm 3 is slidably disposed in the first strip-shaped groove 101 and the second strip-shaped groove 201, and the other end of the crank arm 3 is connected to one end of the rotating shaft 4. The other end of the rotating shaft 4 is connected to the interlocking stopper 7 through a transmission mechanism 6 (such as a gear-rack transmission mechanism, a ball screw assembly or a crank-slider assembly, etc., which converts rotational motion into linear motion). The other end of the first connecting rod 1 is hinged to the operating shaft 12 of the electric earthing switch, and the other end of the second connecting rod 2 is connected to the top end of the small shutter 11. One end of the elastic member 8 is connected to the top end of the small shutter 11 for pulling the small shutter 11 upward to block the operating hole of the operating shaft 12. The travel switch is located below the small shutter 11 and its switch is connected in series in the electric circuit of the earthing switch. When the small shutter 11 is pulled downward, it acts by pressing against the travel switch to cut off the electric circuit of the electric earthing switch.

[0022] In a specific embodiment, a torsion member (such as a torsion spring 5) is provided between the transmission mechanism 6 and the rotating shaft 4 for driving the rotating shaft 4 to rotate and then driving the crank arm 3 to be in a natural position (such as the upper position). In addition, a movable striker 10 is provided between the small shutter 11 and the travel switch. One end of the striker 10 abuts against the bottom end of the small shutter 11, and the other end abuts against the travel switch.

[0023] Specifically, when the trolley is in the working position, the interlocking stopper 7 abuts against the stopper on the trolley, and the rotating shaft 4 cannot rotate. At this time, the crank arm 3 is in the upper position (the crank arm 3 moves between the upper position and the lower position). The crank arm 3 pulls the small shutter 11 through the second connecting rod 2, so that it cannot be pressed down, thereby blocking the operating hole of the operating shaft 12, and thus the operating shaft 12 cannot be manually operated through the operating hole; at the same time, the crank arm 3 also pulls the operating shaft 12 through the first connecting rod 1 so that it cannot rotate and cannot be electrically operated, and of course, cannot be manually operated either.

[0024] When the trolley is in the test position, the stopper on the trolley gives way, and at this time the interlocking baffle can extend into the cabinet; when electrically closing, the earthing switch motor rotates forward to drive the earthing operating shaft 12 to rotate clockwise, drives the crank arm 3 to rotate through the first connecting rod 1, and the crank arm 3 drives the interlocking stopper 7 to extend into the cabinet through the rotating shaft 4 and the transmission mechanism 6 in sequence, so that the interlocking stopper 7 blocks the trolley from being shaken to the working position, meeting the anti-misoperation requirement;

[0025] During manual operation, the small valve 11 is pulled down to the bottom, and the handle operating hole is not blocked by the small valve 11. The handle is inserted to operate the grounding switch; when the small valve 11 is pressed down, the travel switch is triggered by the striker 10, and the travel switch switches the state from normally closed to normally open, disconnecting the electric operation circuit; after the manual operation is completed, the handle is taken out, and because the second connecting rod 2 has a second strip groove empty stroke, the small valve 11 is pulled upward by the spring, the striker 10 moves upward synchronously, and the travel switch is reset, so that the electric circuit is in the power circuit connected state.

[0026] In the test position, after the grounding switch is closed, the operating shaft 12 pulls the crank arm 3 (in the lower position) through the first connecting rod 1, so that the interlocking block 7 is always extended into the cabinet, blocking the trolley from swinging into the working position. At this time, the small valve 11 can be pulled down to perform manual opening operation;

[0027] When the grounding switch is in the electrically opened state, the rotating shaft 4 is in a natural state due to the action of the torsion spring 5, so that the crank arm 3 is in the upper position (the first connecting rod 1 does not support the crank arm 3 at this time). Since the first connecting rod 1 is in an idle stroke, the first connecting rod 1 will not have any interference with the crank arm 3, so the small valve 11 can be pressed down into place, so that the grounding switch can be manually operated to close the switch; if the first connecting rod 1 does not have an idle stroke, the crank arm 3 is supported by the grounding operating shaft 12 and the first connecting rod 1, so that the second connecting rod 2 cannot move downward, that is, the small valve 11 cannot move downward, and the manual operation function cannot be achieved.

[0028] The function of the first connecting rod 1 and the second connecting rod 2 is that when the grounding switch is in the closed state, it can be opened manually or electrically; but in the open state, if the trolley in the cabinet is in the working position, the trolley blocks the interlocking baffle and cannot be extended into the cabinet, and manual and electric operations are impossible; when the electrically operated grounding switch is closed, the first connecting rod 1 pulls the interlocking baffle into the cabinet, blocking the trolley from entering the working position, thereby achieving the function of preventing the grounding switch from being opened or closed by mistake.

[0029] The spring makes the small valve 11 always block the manual operation hole of the grounding switch in the natural state, and the manual operating handle cannot be inserted into the cabinet, and manual operation cannot be performed. The small valve 11 does not press the travel switch striker 10, so that the travel switch does not operate, and the motor circuit is connected to the normally closed auxiliary contact of the travel switch. The electric circuit is connected and can be operated normally by electricity. When the grounding switch needs to be manually operated, the small valve 11 needs to be pressed down manually so that the operating handle can be inserted into the cabinet to operate the grounding shaft to open and close the grounding switch. When the small valve 11 is pressed down, the small valve 11 presses the striker 10 to move downward, so that the travel switch operates, the normally closed auxiliary switch contacts are separated, and the electric operation circuit is cut off, so that manual and electric operations are not performed at the same time, and manual operation is given priority.

[0030] The interlocking mechanism of the electric earthing switch and the electric earthing switch of the present invention, after the electric earthing switch is electrically closed, through the transmission of the first connecting rod 1, the crank arm 3, the rotating shaft 4 and the transmission mechanism 6, the interlocking baffle 7 extends into the cabinet body and abuts against the baffle of the handcart, so as to prevent the circuit breaker from entering the working position; during electric operation, during manual operation, the travel switch 9 can be touched through the small flap 11 and then through the striker 10, so as to avoid performing electric operation at the same time, thus avoiding safety accidents; the overall structure is simple and easy to implement.

[0031] An embodiment of the present invention also discloses an electric earthing switch, which includes an operating shaft and the interlocking mechanism of the electric earthing switch as described above, and also has the advantages as described in the above interlocking mechanism.

[0032] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements and modifications made without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. An interlocking mechanism for an electric earthing switch, characterized in that, it includes a first connecting rod (1), a second connecting rod (2), a crank arm (3), a rotating shaft (4), an interlocking stop block (7), an elastic member (8), a small flap (11) and a switch element (9); one end of the first connecting rod (1) is provided with a first strip-shaped groove (101), one end of the second connecting rod (2) is provided with a second strip-shaped groove (201), one end of the crank arm (3) is slidably arranged in the first strip-shaped groove (101) and the second strip-shaped groove (201), the other end of the crank arm (3) is connected to one end of the rotating shaft (4), the other end of the rotating shaft (4) is connected to the interlocking stop block (7) through a transmission mechanism (6), the other end of the first connecting rod (1) is hinged to the operating shaft (12) of the electric earthing switch, the other end of the second connecting rod (2) is connected to the top end of the small flap (11), one end of the elastic member (8) is connected to the top end of the small flap (11) for pulling the small flap (11) upward to block the operating hole of the operating shaft (12); the switch element (9) is located below the small flap (11) and is used to act by being pressed by the small flap (11) when the small flap (11) is pulled downward to cut off the electric circuit of the electric earthing switch.

2. The interlocking mechanism for an electric earthing switch according to claim 1, characterized in that, a torsion member is provided between the transmission mechanism (6) and the rotating shaft (4) for driving the rotating shaft (4) to rotate and then driving the crank arm (3) to be in a natural position.

3. The interlocking mechanism for an electric earthing switch according to claim 2, characterized in that, the torsion member is a torsion spring (5).

4. The interlocking mechanism for an electric earthing switch according to claim 1 or 2 or 3, characterized in that, a movable striker (10) is arranged between the small flap (11) and the switch element (9), one end of the striker (10) abuts against the bottom end of the small flap (11), and the other end abuts against the switch element (9).

5. The interlocking mechanism for an electric earthing switch according to claim 1 or 2 or 3, characterized in that, the elastic member (8) is a spring.

6. The interlocking mechanism for an electric earthing switch according to claim 1 or 2 or 3, characterized in that, the switch element (9) is a travel switch.

7. The interlocking mechanism for an electric earthing switch according to claim 1 or 2 or 3, characterized in that, the transmission mechanism (6) is a gear and rack transmission mechanism (6).

8. The interlocking mechanism for an electric earthing switch according to claim 1 or 2 or 3, characterized in that, the transmission mechanism (6) is a ball screw assembly.

9. The interlocking mechanism for an electric earthing switch according to claim 1 or 2 or 3, characterized in that, the transmission mechanism (6) is a crank and slider assembly.

10. An electric earthing switch includes an operating shaft (12), characterized in that, it further includes the interlocking mechanism for an electric earthing switch according to any one of claims 1 to 9.

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