Disconnecting link locking mechanism

Abstract

The utility model discloses a disconnecting link locking mechanism in the technical field of circuit breakers, which comprises a locking structure, the locking structure is connected with a swing arm structure through a connecting structure, the locking structure is arranged on the inner side surface of the front part of a moving contact and is matched with a static contact, and the static contact is arranged at the top of a column type insulator. And the swing arm structure is arranged on the inner side surface of the rear part of the moving contact and is connected with the pin insulator. After switching on, the static contact and the moving contact are pressed and contacted, and the fixing and locking structure firmly abuts against the rear end of the static contact, so that the static contact and the moving contact are locked and fixed, displacement between the moving contact and the static contact can be ensured not to occur when shaking occurs, the moving contact and the static contact are prevented from being burnt, and when switching off, the connecting structure is pulled through the swing arm structure, so that the moving contact and the static contact are prevented from being damaged. Therefore, the locking structure is separated from the static contact, thereby realizing opening.

Description

Technical Field

[0001] The utility model relates to a knife-switch locking mechanism in the technical field of circuit breakers. Background Art

[0002] In the prior art, when the knife-switch of the circuit breaker is in the closed state, two moving contacts are kept pressed against the static contact by a compression spring. When the circuit breaker is in the closed state, the interlocking shaft is pushed out to interlock the knife-switch. At this time, the knife-switch cannot be manually switched on or off. However, when the circuit breaker passes through a short-time ultra-high voltage and large current, it vibrates under the action of a large magnetic field force. Only relying on the action of the compression spring cannot ensure the stability between the moving contact and the static contact of the knife-switch. Therefore, the contact part between the moving contact and the static contact of the knife-switch will be displaced due to vibration, resulting in poor contact between the two, and the local heat will increase instantaneously, ultimately leading to the burning of the contact. Content of the Utility Model

[0003] The purpose of the utility model is to provide a knife-switch locking mechanism, so that the moving contact is firmly connected to the static contact, avoiding the burning of the contact due to the displacement of the two caused by vibration.

[0004] To achieve the above purpose, the utility model provides a knife-switch locking mechanism, including a locking structure. The locking structure is connected to a swing arm structure through a connecting structure. The locking structure is arranged on the front inner side of the moving contact and cooperates with the static contact. The static contact is installed on the top of a columnar insulator. The swing arm structure is arranged on the rear inner side of the moving contact and is connected to a pin-type insulator.

[0005] Compared with the prior art, the beneficial effect of the utility model is that after closing, the static contact and the moving contact are pressed and contacted, and the locking structure firmly resists the rear end of the static contact, so that the static contact and the moving contact are locked and fixed. Therefore, even when vibration occurs, it can be ensured that there is no displacement between the moving contact and the static contact, avoiding the burning of the moving contact and the static contact. When opening, the connecting structure is pulled by the swing arm structure, so that the locking structure is separated from the static contact, thereby realizing opening.

[0006] As a further improvement of the utility model, the locking structure includes a locking arm. A buckle is arranged at the lower end of the locking arm. An installation groove is opened at the upper part of the locking arm. A torsion spring is arranged in the installation groove. A pin hole is opened at the upper part of the locking arm. The locking arm is connected to the moving contact through a pin inserted through the pin hole. The torsion spring is sleeved on the pin. The rear surface of the locking arm is connected to the connecting structure.

[0007] In this way, when closing, the buckle at the lower end of the locking arm abuts against the rear end of the static contact, and the lower end of the torsion spring presses against the lower edge of the installation groove, so that the whole buckle generates a force obliquely downward to firmly press the rear end of the static contact. In this way, once the circuit breaker passes through a short-time ultra-high voltage and large current, the moving contact and the static contact will not vibrate greatly due to the magnetic field force, thereby avoiding displacement between the two.

[0008] As a further improvement of the utility model, the swing arm structure includes a crank arm, the lower end of the crank arm is connected to the connecting structure, the bent portion of the crank arm is connected to the moving contact through a pin shaft, a clamping groove is provided at the rear of the crank arm, the clamping groove is connected to the upper part of the adjusting rod, the lower end of the adjusting rod is connected to the top of the pin insulator, a screw hole is provided at the rear of the crank arm, a waist-shaped hole is provided at the rear of the moving contact, and the rear of the crank arm is connected to the moving contact by a bolt passing through the screw hole, the adjusting rod and the waist-shaped hole.

[0009] In this way, when the switch is opened, the moving contact rotates upward clockwise, causing the adjusting rod to move upward along the waist-shaped hole, thereby driving the lower end of the crank arm to rotate backward counterclockwise around the pin shaft, and then the crank arm pulls the buckle of the locking arm to rotate backward through the connecting structure, so that the buckle disengages from the rear end of the static contact, thereby unlocking the moving contact and the static contact.

[0010] As a further improvement of the utility model, the connecting structure includes a connecting rod, and a front bent screw head and a rear bent screw head are provided at both ends of the connecting rod. The front bent screw head is inserted into the waist-shaped groove on the connecting block and fixed by a nut. The connecting block is arranged behind the locking arm, and the rear bent screw head is inserted into the mounting hole provided at the lower end of the crank arm and fixed by a nut.

[0011] In this way, the front end of the connecting rod is inserted into the waist-shaped groove, and the nut is screwed so that the front end of the connecting rod will not be separated from the waist-shaped groove, and the front end of the connecting rod can also move forward and backward along the waist-shaped groove. The rear end of the connecting rod is inserted into the mounting hole and fixed by the nut. At the moment of closing the circuit, the buckle will hit the static contact, so the static contact will apply a backward force to the buckle in the reverse direction, causing the locking arm as a whole to instantly produce a backward displacement, and the overall width of the waist-shaped groove is greater than this displacement, so that the locking arm will not collide hard with the front end of the connecting rod, thereby avoiding damage to the entire mechanism due to the impact force generated by closing the circuit.

[0012] As a further improvement of the utility model, the upper part of the adjusting rod is processed into a flat shape.

[0013] This makes it easy to insert the upper part of the adjusting rod into the clamping groove, and will not scratch the inner wall of the clamping groove when moving up and down along the waist-shaped hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model.

[0015] Figure 2 It is a schematic diagram of the gate-breaking structure of the utility model.

[0016] Figure 3 It is a schematic diagram of the closing structure of the utility model.

[0017] Figure 4 for Figure 2Partial enlarged view at location A in [the figure].

[0018] Figure 5 is Figure 3 Partial enlarged view at location B in [the figure].

[0019] Figure 6 is Figure 3 Partial enlarged view at location C in [the figure].

[0020] Figure 7 Schematic structural view of the adjusting rod in the present utility model.

[0021] Wherein, 1 is a pin hole, 2 is a torsion spring, 3 is a connecting block, 4 is a moving contact, 5 is a pin shaft, 6 is a clamping groove, 7 is a mounting groove, 8 is a locking arm, 9 is a buckle, 10 is a waist-shaped groove, 11 is a connecting rod, 12 is a crank arm, 13 is a screw hole, 14 is a static contact, 15 is a post insulator, 16 is a pin insulator, 17 is a bolt, 18 is an adjusting rod, 19 is a waist-shaped hole. Detailed implementation manners

[0022] The present utility model will be further described below in conjunction with the accompanying drawings:

[0023] As Figures 1-7 shown, a knife switch locking mechanism includes a locking structure. The locking structure is connected to a swing arm structure through a connecting structure. The locking structure is arranged on the front inner side of the moving contact 4 and cooperates with the static contact 14. The static contact 14 is installed on the top of the post insulator 15. The swing arm structure is arranged on the rear inner side of the moving contact 4 and is connected to the pin insulator 16.

[0024] The locking structure includes a locking arm 8. A buckle 9 is arranged at the lower end of the locking arm 8. A mounting groove 7 is formed in the upper part of the locking arm 8. A torsion spring 2 is arranged in the mounting groove 7. A pin hole 1 is formed in the upper part of the locking arm 8. The locking arm 8 is connected to the moving contact 4 through a pin inserted through the pin hole 1. The torsion spring 2 is sleeved on the pin. The rear surface of the locking arm 8 is connected to the connecting structure.

[0025] The swing arm structure includes a crank arm 12. The lower end of the crank arm 12 is connected to the connecting structure. The bent part of the crank arm 12 is connected to the moving contact 4 through a pin shaft 5. A clamping groove 6 is formed in the rear part of the crank arm 12. The clamping groove 6 is connected to the upper part of the adjusting rod 18. The lower end of the adjusting rod 18 is connected to the top of the pin insulator 16. A screw hole 13 is formed in the rear part of the crank arm 12. A waist-shaped hole 19 is formed in the rear part of the moving contact 4. The rear part of the crank arm 12 is connected to the moving contact 4 through a bolt 17 passing through the screw hole 13, the adjusting rod 18 and the waist-shaped hole 19.

[0026] The connection structure includes a connecting rod 11, and the two ends of the connecting rod 11 are provided with a front bending screw head and a rear bending screw head. The front bending screw head is plugged into the waist groove 10 provided on the connecting block 3 and fixed by a nut. The connecting block 3 is arranged behind the locking arm 8, and the rear bending screw head is plugged into the mounting hole provided at the lower end of the crank arm and fixed by a nut. The upper part of the adjusting rod 18 is processed into a flat shape.

[0027] In the utility model, when closing the circuit, the moving contact 4 rotates downward counterclockwise, so that the adjusting rod 18 moves downward along the waist-shaped hole 19, thereby driving the lower end of the crank arm 12 to rotate upward clockwise with the pin shaft 5 as the center, and then pushing the connecting rod 11 to move forward along the waist-shaped groove 10, and the buckle 9 at the lower end of the locking arm 8 contacts the rear end of the static contact 14 at the moment of closing the circuit, and presses the lower end edge of the mounting groove 7 through the lower end of the torsion spring 2, so that the entire buckle 9 generates an oblique downward force to firmly press the rear end of the static contact 14, so that once the circuit breaker passes a short-term ultra-high voltage and large current, the moving contact 4 and the static contact 14 will not produce a large shake due to the magnetic field force, thereby avoiding displacement between the two. When the buckle 9 presses the static contact 14 under the action of the torsion spring 2, there will be an action of hitting the static contact 14, so the static contact 14 will reversely apply a backward force to the buckle 9, so that the locking arm 8 as a whole will instantly produce a backward displacement, and the overall groove width of the waist-shaped groove 10 is greater than this displacement, so that the locking arm 8 will not have a hard collision with the front end of the connecting rod 11, thereby avoiding the entire mechanism from being damaged by the impact force generated by closing the switch.

[0028] When opening the switch, the moving contact 4 rotates upward clockwise, causing the adjusting rod 18 to move upward along the waist-shaped hole 19, thereby driving the lower end of the crank arm 12 to rotate backward counterclockwise around the pin shaft 5, and then the crank arm 12 pulls the rear end of the waist-shaped groove 10 through the front end of the connecting rod 11, and then pulls the locking arm 8 to rotate backward, so that the buckle 9 disengages from the rear end of the static contact 14, thereby realizing the unlocking of the moving contact 4 and the static contact 14.

[0029] The utility model ensures that the moving contact 4 is firmly connected to the stationary contact 14 when the switch is closed, thereby preventing the moving contact 4 and the stationary contact 14 from being displaced and burned due to jitter caused by a large magnetic force when a large current passes through.

[0030] The present utility model is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed herein, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. A knife-switch locking mechanism, characterized in that: It includes a locking structure. The locking structure is connected to the swing arm structure through a connecting structure. The locking structure is arranged on the inner side of the front part of the moving contact and cooperates with the static contact. The static contact is installed on the top of the post insulator, and the swing arm structure is arranged on the inner side of the rear part of the moving contact and is connected to the pin insulator.

2. The knife-switch locking mechanism according to claim 1, characterized in that: The locking structure includes a locking arm. A buckle is arranged at the lower end of the locking arm. An installation groove is formed in the upper part of the locking arm. A torsion spring is arranged in the installation groove. A pin hole is formed in the upper part of the locking arm. The locking arm is connected to the moving contact through a pin inserted through the pin hole. The torsion spring is sleeved on the pin. The rear surface of the locking arm is connected to the connecting structure.

3. The knife switch locking mechanism according to claim 2, characterized in that: The swing arm structure includes a crank arm. The lower end of the crank arm is connected to the connecting structure. The bent part of the crank arm is connected to the moving contact through a pin shaft. A clamping groove is formed in the rear part of the crank arm. The clamping groove is connected to the upper part of the adjusting rod. The lower end of the adjusting rod is connected to the top of the pin insulator. A threaded hole is formed in the rear part of the crank arm. A kidney-shaped hole is formed in the rear part of the moving contact. The rear part of the crank arm is connected to the moving contact through a bolt passing through the threaded hole, the adjusting rod and the kidney-shaped hole.

4. The knife switch locking mechanism according to claim 3, wherein: The connecting structure includes a connecting rod. Front and rear bent screw heads are arranged at both ends of the connecting rod. The front bent screw head is inserted into a kidney-shaped groove formed in the connecting block and fixed by a nut. The connecting block is arranged on the rear surface of the locking arm. The rear bent screw head is inserted into an installation hole formed in the lower end of the crank arm and fixed by a nut.

5. The knife switch locking mechanism according to claim 3, characterized in that: The upper part of the adjusting rod is processed into a flat shape.

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