Transformer with contact anti-sticking insulating oil mechanism

Abstract

This invention provides a transformer with a contact anti-sticking insulating oil mechanism, belonging to the technical field of on-load tap-changing transformers. The transformer with this contact anti-sticking insulating oil mechanism includes a transformer body, a contact cylinder, and a drive cylinder. An insulating flange is provided between the contact cylinder and the drive cylinder. The transformer body is equipped with a bubble-puncturing mechanism, which includes an annular bubble interception frame and an insulating frame. By setting up the bubble-puncturing mechanism, bubbles generated in the insulating oil due to disturbance float upwards until they are intercepted by the interception net. At this point, the lever is reset, causing the bubble-puncturing actuator plate to drive the spikes back to their original position, thereby breaking the bubbles. This avoids the problem of a large number of bubbles accumulating in the insulating oil, leading to an increase in bubbles as the moving contact rotates, and the bubbles easily adhering to the moving and stationary contacts. Compared with existing technologies, this reduces the possibility of arcing due to bubble influence.

Description

Technical Field

[0001] This invention relates to the field of on-load tap-changing transformer technology, and more specifically, to a transformer with a contact anti-sticking insulating oil mechanism. Background Technology

[0002] Amorphous alloy transformers are widely used in power distribution systems due to their low core loss and significant energy-saving effect. On-load tap changers, as their core voltage regulating components, can switch tap positions when the transformer is under load, ensuring stable output voltage. In existing technologies, on-load tap changers generally adopt a vertical structure of contact cylinder, drive cylinder, and insulating flange. Moving and stationary contacts are arranged inside the contact cylinder. The drive cylinder drives the drive shaft to rotate through a reduction gear transmission assembly, which in turn drives the moving contact to rotate and achieve tap position switching.

[0003] However, when on-load tap changers switch contacts in insulating oil, the rapid rotation of the moving contact will violently disturb the insulating oil, causing dissolved gases in the oil to be released and generating a large number of bubbles. These bubbles float upwards due to buoyancy and easily accumulate in the upper space of the switch. If the bubbles are not eliminated in time, they will adhere to the surfaces of the moving and stationary contacts. When the contacts are energized and separated or closed, the presence of bubbles will significantly reduce the insulation strength and easily cause partial discharge or even arcing, seriously threatening the electrical life and operational safety of the switch. Summary of the Invention

[0004] To overcome the above deficiencies, the present invention provides a transformer with a contact anti-sticking insulating oil mechanism that overcomes or at least partially solves the above technical problems.

[0005] This invention is implemented as follows:

[0006] This invention provides a transformer with a contact anti-sticking insulating oil mechanism, comprising a transformer body, a contact cylinder, and a drive cylinder, wherein an insulating flange is provided between the contact cylinder and the drive cylinder, and a bubble puncture mechanism is provided on the transformer body, the bubble puncture mechanism comprising: An annular bubble interception frame is fixed to the inner wall of the contact cylinder. A bubble puncture execution plate is slidably arranged above the annular bubble interception frame. A spike is provided on the side of the bubble puncture execution plate near the annular bubble interception frame. Both the annular bubble interception frame and the bubble puncture execution plate are arranged in a circumferential array with a number of filter holes. An insulating frame is fixed to the bottom of an insulating flange, and the top of the insulating frame is open. A first connecting rod is provided inside the insulating frame. A first hinge frame is fixed to the top of the bubble puncture actuator plate, and the first hinge frame and the first connecting rod are hinged together.

[0007] In a preferred embodiment, a support frame is fixed to the bottom of the insulating flange, and a lever is hinged to the support frame. The other end of the first connecting rod is hinged to the lever.

[0008] In a preferred embodiment, a guide sleeve is fixed inside the insulating flange, a slide rod is slidably arranged inside the guide sleeve, a second hinge frame is fixed at the bottom of the slide rod, a second connecting rod is arranged between the second hinge frame and the lever, one end of the second connecting rod is hinged to the second hinge frame, and the other end of the second connecting rod is hinged to the lever.

[0009] In a preferred embodiment, a cam abutment block is integrally formed at one end of the slide rod that extends through the drive cylinder, a reset plate is coaxially fixed to the surface of the slide rod, and a first spring is provided between the reset plate and the insulating flange.

[0010] In a preferred embodiment, a drive shaft is rotatably mounted inside the drive cylinder, a reset ring is fixedly mounted on the top of the insulating flange, the drive shaft is sleeved inside the reset ring, and a gradient cam is rotatably mounted on the reset ring.

[0011] In a preferred embodiment, a protective shell is fixed to the top of the insulating flange, and a hydraulic rod is provided inside the protective shell, with a pull ring provided at the output end of the hydraulic rod.

[0012] In a preferred embodiment, the pull ring is internally rotatably provided with a first toothed clutch, a second spring is provided between the first toothed clutch and the gradient cam, and a second toothed clutch is coaxially fixed on the surface of the drive shaft, wherein the first toothed clutch and the second toothed clutch are engaged.

[0013] In a preferred embodiment, the insulating frame is provided with an air bubble elimination auxiliary mechanism, which includes a piston cylinder fixed to the inner wall of the support frame. A piston bolt is slidably disposed inside the piston cylinder, and a piston rod is fixed on the piston bolt.

[0014] In a preferred embodiment, a rotating rod is rotatably mounted on the inner wall of the support frame, a third connecting rod is fixed on the rotating rod, a fourth connecting rod is hinged to the third connecting rod, and the other end of the fourth connecting rod is hinged to the piston rod.

[0015] In a preferred embodiment, a gear is fixedly mounted on the surface of the rotating rod, a rack is slidably mounted on the inner wall of the support frame, the rack and the gear mesh with each other, a third spring is provided between the rack and the inner wall of the support frame, and a stroke trigger rod is fixedly mounted on the lever.

[0016] The transformer with a contact anti-sticking insulating oil mechanism provided by the present invention has the following beneficial effects: 1. By setting up a bubble-puncturing mechanism, bubbles generated in the insulating oil due to disturbance float upwards until they are intercepted by the interception net. At this time, the lever is reset, causing the bubble-puncturing actuator plate to drive the spikes back to their original positions, thereby breaking the bubbles. This avoids the problem of a large number of bubbles accumulating in the insulating oil, causing more and more bubbles to accumulate as the moving contact rotates, and bubbles easily adhering to the moving and stationary contacts. Compared with the existing technology, this reduces the possibility of arcing due to the influence of bubbles.

[0017] 2. By setting up an auxiliary bubble elimination mechanism, when the on-load tap changer is adjusting the voltage under on-load conditions, if the difference between the current setting and the preset adjustment setting is large, the rotation angle of the drive shaft will be larger, and the rotation angle of the moving contact will be larger, which will generate more foam. At this time, the piston bolt will move continuously inside the piston cylinder. When the piston bolt moves upward, the bubble will puncture the opening of the actuator plate through the connecting pipe and generate suction simultaneously, thereby pre-treating some of the foam, reducing the pressure of the subsequent spikes, and further improving the defoaming effect. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure provided by an embodiment of the present invention; Figure 2 A top-view schematic diagram of the overall structure is provided for embodiments of the present invention; Figure 3 A schematic diagram of the contact cylinder and the drive cylinder is provided for embodiments of the present invention; Figure 4 A partial cross-sectional view of the contact cylinder and the drive cylinder is provided for embodiments of the present invention; Figure 5 A schematic diagram of the structure of the gradient cam is provided for embodiments of the present invention; Figure 6 An exploded view of the pull ring and the first toothed clutch is provided for embodiments of the present invention; Figure 7 A schematic diagram of the structure of the annular bubble interception frame and the bubble puncture execution plate is provided for embodiments of the present invention; Figure 8 A partial cross-sectional view of the insulating frame is provided for embodiments of the present invention; Figure 9 Provided for embodiments of the present invention Figure 8 A magnified view of a portion of point A in the middle.

[0020] In the diagram: 1. Transformer body; 2. Contact cylinder; 3. Drive cylinder; 4. Insulating flange; 501. Annular bubble interception frame; 502. Bubble puncture actuator plate; 503. Spike; 504. Insulating frame; 505. First connecting rod; 506. First hinge frame; 507. Support frame; 508. Lever; 509. Guide sleeve; 510. Slide rod; 511. Second hinge frame; 512. Second connecting rod; 513. Cam abutment block; 514. Reset plate; 515. First spring 516. Drive shaft; 517. Reset ring; 518. Gradient cam; 519. Protective housing; 520. Hydraulic rod; 521. Pull ring; 522. First jaw clutch; 523. Second spring; 524. Second jaw clutch; 601. Piston cylinder; 602. Piston bolt; 603. Piston rod; 604. Rotating rod; 605. Third connecting rod; 606. Fourth connecting rod; 607. Gear; 608. Rack; 609. Third spring; 610. Stroke trigger rod. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Reference Figures 1-9This invention provides a technical solution: a transformer with a contact anti-sticking insulating oil mechanism, comprising a transformer body 1, a contact cylinder 2, and a drive cylinder 3, wherein an insulating flange 4 is provided between the contact cylinder 2 and the drive cylinder 3, and a bubble puncture mechanism is provided on the transformer body 1, the bubble puncture mechanism comprising an annular bubble interception frame 501 and an insulating frame 504, the annular bubble interception frame 501 being detachably fixed to the inner wall of the contact cylinder 2, the annular bubble interception frame 501 being located above the moving contact, and a bubble puncture actuating plate 502 being slidably disposed above the annular bubble interception frame 501, the bubble puncture actuating plate 502 being close to the annular bubble interception frame. A spike 503 is provided on one side of the 501. Both the annular bubble interception frame 501 and the bubble puncture execution plate 502 have several filter holes arranged in a circumferential array. The filter holes on the annular bubble interception frame 501 are mesh-shaped, and the filter holes on the bubble puncture execution plate 502 are circular. An insulating frame 504 is fixed to the bottom of the insulating flange 4. The top of the insulating frame 504 is open. A first connecting rod 505 is provided inside the insulating frame 504. A first hinge frame 506 is fixed to the top of the bubble puncture execution plate 502. The first hinge frame 506 and the first connecting rod 505 are hinged together. The bottom of the insulating flange 4... The unit is bolted to a support frame 507, on which a lever 508 is hinged. The other end of the first connecting rod 505 is hinged to the lever 508. A bubble-puncturing mechanism is included. When on-load tap changer is needed, the on-load tap changer activates. Driven by an external motor, and in conjunction with a reducer and transmission assembly, the drive shaft 516 rotates, causing the moving contact to rotate until it reaches the desired gear position at a preset angle. During this process, the rotation of the drive shaft 516 causes the lever 508 to swing, which in turn rotates the first connecting rod 505. This causes the bubble-piercing actuator plate 502 to move upward, causing the spike 503 to detach from the filter hole on the interceptor plate. At this time, due to the rotation of the moving contact in the insulating oil, the bubbles generated by the disturbance in the insulating oil float upward until they are intercepted by the interceptor net. Then, the lever 508 is reset, causing the bubble-piercing actuator plate 502 to move the spike 503 back to its original position, thereby breaking the bubbles and avoiding a large number of bubbles accumulating in the insulating oil. As the moving contact rotates, more and more bubbles are generated, and the bubbles easily adhere to the moving and stationary contacts. Compared with the existing technology, this reduces the possibility of arcing due to the influence of bubbles. Reference Figures 1-9An insulating flange 4 has a guide sleeve 509 fixed inside, and a slide rod 510 is slidably arranged inside the guide sleeve 509. A second hinge frame 511 is fixed at the bottom of the slide rod 510. A second connecting rod 512 is arranged between the second hinge frame 511 and the lever 508. One end of the second connecting rod 512 is hinged to the second hinge frame 511, and the other end of the second connecting rod 512 is hinged to the lever 508. By setting the second connecting rod 512, when the slide rod 510 moves downward, it drives the second hinge frame 511 to move downward, thereby driving the second connecting rod 512 to rotate. Through the hinge between the second connecting rod 512 and the lever 508, the lever 508 is driven to swing. Reference Figures 1-9A cam abutment block 513 is integrally formed at one end of the slide rod 510 extending into the drive cylinder 3. A reset plate 514 is coaxially fixed to the surface of the slide rod 510. A first spring 515 is provided between the reset plate 514 and the insulating flange 4. A drive shaft 516 is rotatably mounted inside the drive cylinder 3. A reset ring 517 is fixed to the top of the insulating flange 4. The drive shaft 516 is sleeved inside the reset ring 517, but the two do not contact each other. A gradient cam 518 is rotatably mounted on the reset ring 517. A torsion spring is provided between the reset ring 517 and the gradient cam 518. A protective cover is fixed to the top of the insulating flange 4. The housing 519 contains a hydraulic rod 520. A pull ring 521 is located at the output end of the hydraulic rod 520. A first jaw clutch 522 is rotatably mounted inside the pull ring 521. A second spring 523 and a telescopic rod are positioned between the first jaw clutch 522 and the transition cam 518. A second jaw clutch 524 is coaxially fixed to the surface of the drive shaft 516. The first jaw clutch 522 and the second jaw clutch 524 engage. By configuring the first jaw clutch 522 and the second jaw clutch 524, the on-load tap changer operates. At this time, the rotation of the drive shaft 516 drives the second jaw clutch 524 to rotate. Through the meshing between the spur teeth of the first jaw clutch 522 and the second jaw clutch 524, the first jaw clutch 522 drives the gradual cam 518 to rotate. Its gradual arc surface presses against the cam abutment block 513, causing the slide rod 510 to move downward, thereby causing the air bubble to puncture the actuator plate 502 and move upward. When the gear adjustment is completed, the drive shaft 516 stops rotating. At this time, the air bubble generated by the rotation and movement of the moving contact has been intercepted by the interception net. The hydraulic rod 520 is activated, driving... The pull ring 521 moves downward, thereby driving the first toothed clutch 522 to move downward, causing the spur teeth of the first toothed clutch 522 and the second toothed clutch 524 to disengage. Under the action of the torsion spring's rebound force, the gradual cam 518 and the first toothed clutch 522 quickly return to their initial positions. At this time, after losing the compression of the gradual cam 518, under the rebound force of the first spring 515, the slide bar 510 returns to its original position, and the lever 508 reaches the horizontal state again, thereby causing the bubble to puncture the actuator plate 502 and drive the spike 503 back to its original position, thus defoaming the intercepted bubble. Reference Figures 1-9An auxiliary bubble elimination mechanism is provided inside the insulating frame 504. This mechanism includes a piston cylinder 601, which is fixed to the inner wall of the support frame 507. A piston bolt 602 is slidably disposed inside the piston cylinder 601, and a piston rod 603 is fixed to the piston bolt 602. The piston cylinder 601 has an inlet and an outlet, each equipped with a one-way valve with opposite valve disc directions. A connecting pipe is provided between the inlet and the bubble puncture actuator plate 502. Several openings are provided below the bubble puncture actuator plate 502 to generate suction through negative pressure, thereby eliminating foam. By providing this auxiliary bubble elimination mechanism, when the on-load tap changer is performing on-load voltage regulation, if the difference between the current setting and the preset adjustment setting is large... The larger rotation angle of the drive shaft 516 and the larger rotation angle of the moving contact will generate more foam. At this time, the slide bar 510 moves downward a greater distance, and the lever 508 swings a greater amplitude. After the lever 508 swings to the preset angle, the piston rod 603 drives the piston bolt 602 to move vertically back and forth, so that the piston bolt 602 moves continuously inside the piston cylinder 601. When the piston bolt 602 moves upward, it causes the bubbles to puncture the opening of the actuator plate 502 through the connecting pipe and generate suction at the same time, thereby pre-treating some of the foam, reducing the pressure of the subsequent spikes 503, and further improving the defoaming effect. When the piston bolt 602 moves downward, the insulating oil is discharged out of the piston cylinder 601 through the outlet. Reference Figures 1-9 A rotating rod 604 is rotatably mounted on the inner wall of the support frame 507. A third connecting rod 605 is fixed on the rotating rod 604, and a fourth connecting rod 606 is hinged to the third connecting rod 605. The other end of the fourth connecting rod 606 is hinged to the piston rod 603 via a third hinge frame. A gear 607 is fixed on the surface of the rotating rod 604. A rack 608 is slidably mounted on the inner wall of the support frame 507, and the rack 608 meshes with the gear 607. A third spring 609 is provided between the rack 608 and the inner wall of the support frame 507. A stroke trigger rod 610 is fixed on the lever 508. By setting the stroke trigger rod 610, when the lever 508 rotates, it synchronously drives the stroke trigger rod 610 to rotate. After rotating to the preset angle, the stroke trigger rod 610 presses against the rack 608, causing the rack 608 to move downwards. Through the meshing connection between the rack 608 and the gear 607, the gear 607 starts to drive the rotating rod 604 to rotate. The rotating rod 604 drives the third connecting rod 605 to rotate. Since the two ends of the fourth connecting rod 606 are hinged to the third connecting rod 605 and the piston rod 603 respectively, the fourth connecting rod 606 swings while driving the piston rod 603 to move back and forth in the vertical direction. When the lever 508 returns to its original position, it loses the pressure of the stroke trigger rod 610. Under the action of the rebound force of the third spring 609, the rack 608 and the piston bolt 602 return to their original positions.

[0023] Specifically, the working process or principle of the transformer with the contact anti-stick insulating oil mechanism is as follows: During use, when on-load tap changing is required, the on-load tap changer starts working. Driven by an external motor, and in conjunction with a reducer and transmission components, it ultimately drives the drive shaft 516 to rotate, causing the moving contact to rotate until it reaches a preset angle according to the required gear. During this process, the rotation of the drive shaft 516 drives the second jaw clutch 524 to rotate. Through the meshing between the spur teeth of the first jaw clutch 522 and the second jaw clutch 524, the first jaw clutch 522 drives the gradual cam 518 to rotate. Its gradual arc-shaped surface presses against the cam abutment block 513, causing the slide rod 51... The 0 moves downward, causing the second hinge frame 511 to move downward, thereby causing the second connecting rod 512 to rotate. Through the hinge between the second connecting rod 512 and the lever 508, the lever 508 is driven to swing. When the lever 508 swings, it causes the first connecting rod 505 to rotate, thereby causing the bubble to puncture the actuator plate 502 to move upward, so that the spike 503 disengages from the filter hole on the interceptor plate. At this time, due to the rotation and movement of the moving contact in the insulating oil, the bubbles generated by the disturbance in the insulating oil float upward until they are intercepted by the interceptor net. The hydraulic rod 520 is activated, causing the pull ring 521 to move downward, thereby causing the first jaw clutch 522 to move downward, so that the spur teeth of the first jaw clutch 522 and the second jaw clutch 524 disengage from each other. Under the restoring force of the torsion spring, the gradient cam 518 and the first toothed clutch 522 quickly return to their initial positions. At this point, after losing the compression of the gradient cam 518, the slide rod 510 returns to its original position under the restoring force of the first spring 515, and the lever 508 returns to a horizontal state. This causes the bubble to puncture the actuator plate 502, driving the spike 503 back to its original position, thus defoaming the intercepted bubbles. When the difference between the current gear and the preset adjustment gear is large, the rotation angle of the drive shaft 516 is greater, and the rotation angle of the moving contact is also greater, which will generate more foam. At this time, the slide rod 510 moves downward a greater distance, and the lever 508 swings more. When the lever 508 rotates to the preset angle, the stroke trigger rod 610 engages the rack 608. The compression causes the rack 608 to move downwards. Through the meshing connection between the rack 608 and the gear 607, the gear 607 starts to drive the rotating rod 604 to rotate. The rotating rod 604 drives the third connecting rod 605 to rotate. Since the two ends of the fourth connecting rod 606 are hinged to the third connecting rod 605 and the piston rod 603 respectively, the fourth connecting rod 606 swings and drives the piston rod 603 to move back and forth in the vertical direction. This causes the piston bolt 602 to move continuously inside the piston cylinder 601. When the piston bolt 602 moves upwards, it causes the air bubble to puncture the opening of the actuator plate 502 through the connecting pipe, generating suction simultaneously. This pre-treats some of the foam, reduces the pressure of the subsequent spikes 503, and further improves the defoaming effect.

Claims

1. A transformer with a contact anti-sticking insulating oil mechanism, comprising a transformer body (1), a contact cylinder (2) and a drive cylinder (3), wherein an insulating flange (4) is provided between the contact cylinder (2) and the drive cylinder (3), characterized in that: The transformer body (1) is provided with a bubble puncturing mechanism, which includes: An annular bubble interception frame (501) is fixed to the inner wall of the contact cylinder (2). A bubble puncture execution plate (502) is slidably arranged above the annular bubble interception frame (501). A spike (503) is arranged on the side of the bubble puncture execution plate (502) near the annular bubble interception frame (501). Both the annular bubble interception frame (501) and the bubble puncture execution plate (502) are arranged with a number of filter holes in a circumferential array. An insulating frame (504) is fixed to the bottom of the insulating flange (4). The top of the insulating frame (504) is open. A first connecting rod (505) is provided inside the insulating frame (504). A first hinge frame (506) is fixed to the top of the bubble puncture actuator plate (502). The first hinge frame (506) and the first connecting rod (505) are hinged together.

2. The transformer with a contact anti-sticking insulating oil mechanism according to claim 1, characterized in that, The bottom of the insulating flange (4) is fixed with a support frame (507), and a lever (508) is hinged on the support frame (507). The other end of the first connecting rod (505) is hinged to the lever (508).

3. The transformer with a contact anti-sticking insulating oil mechanism according to claim 2, characterized in that, The insulating flange (4) is fixedly provided with a guide sleeve (509), and a slide rod (510) is slidably provided inside the guide sleeve (509). A second hinge frame (511) is fixedly provided at the bottom of the slide rod (510). A second connecting rod (512) is provided between the second hinge frame (511) and the lever (508). One end of the second connecting rod (512) is hinged to the second hinge frame (511), and the other end of the second connecting rod (512) is hinged to the lever (508).

4. The transformer with a contact anti-sticking insulating oil mechanism according to claim 3, characterized in that, The slide rod (510) extends through the drive cylinder (3) and is integrally formed with a cam abutment block (513). A reset plate (514) is coaxially fixed on the surface of the slide rod (510). A first spring (515) is provided between the reset plate (514) and the insulating flange (4).

5. The transformer with a contact anti-sticking insulating oil mechanism according to claim 1, characterized in that, The drive cylinder (3) is rotatably provided with a drive shaft (516), and the top of the insulating flange (4) is fixedly provided with a reset ring (517). The drive shaft (516) is sleeved inside the reset ring (517), and a gradient cam (518) is rotatably provided on the reset ring (517).

6. The transformer with a contact anti-sticking insulating oil mechanism according to claim 5, characterized in that, The top of the insulating flange (4) is fixed with a protective shell (519), and a hydraulic rod (520) is provided inside the protective shell (519). A pull ring (521) is provided at the output end of the hydraulic rod (520).

7. The transformer with a contact anti-sticking insulating oil mechanism according to claim 6, characterized in that, The pull ring (521) is internally rotatably equipped with a first toothed clutch (522), and a second spring (523) is provided between the first toothed clutch (522) and the gradient cam (518). A second toothed clutch (524) is coaxially fixed on the surface of the drive shaft (516), and the first toothed clutch (522) and the second toothed clutch (524) mesh with each other.

8. The transformer with a contact anti-sticking insulating oil mechanism according to claim 2, characterized in that, The insulating frame (504) is provided with an air bubble elimination auxiliary mechanism, which includes a piston cylinder (601). The piston cylinder (601) is fixed to the inner wall of the support frame (507). A piston bolt (602) is slidably provided inside the piston cylinder (601), and a piston rod (603) is fixed on the piston bolt (602).

9. The transformer with a contact anti-sticking insulating oil mechanism according to claim 8, characterized in that, A rotating rod (604) is rotatably mounted on the inner wall of the support frame (507). A third connecting rod (605) is fixed on the rotating rod (604). A fourth connecting rod (606) is hinged on the third connecting rod (605). The other end of the fourth connecting rod (606) is hinged to the piston rod (603).

10. The transformer with a contact anti-sticking insulating oil mechanism according to claim 9, characterized in that, A gear (607) is fixedly mounted on the surface of the rotating rod (604), and a rack (608) is slidably mounted on the inner wall of the support frame (507). The rack (608) and the gear (607) mesh with each other. A third spring (609) is provided between the rack (608) and the inner wall of the support frame (507). A stroke trigger rod (610) is fixedly mounted on the lever (508).

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