Three-station mechanism opening mechanical braking structure and braking method

Abstract

The invention relates to a three-station mechanism opening mechanical braking structure and method, and the structure comprises a mechanism frame, a main shaft which is in shaft connection with the mechanism frame, a drive plate which is fixedly connected with the main shaft, and an opening braking assembly. The opening brake assembly comprises a support fixedly connected to the mechanism frame, an umbrella-shaped brake block connected to the support in a sliding mode and an elastic assembly pushing the umbrella-shaped brake block towards the driving plate, a brake protrusion is arranged at the end, close to the driving plate, of the umbrella-shaped brake block, and a driving plate protrusion is arranged on the edge of the driving plate. The driving plate protrusion on the driving plate makes contact with the braking protrusion on the umbrella-shaped braking block, the driving plate extrudes the umbrella-shaped braking block, meanwhile, the elastic assembly is gradually compressed, at the moment, the driving plate receives the resistance effect from the umbrella-shaped braking block, the braking effect is achieved, and therefore the mechanism can be rapidly braked when opening is in place, the structure is simple and reliable, and operation is convenient. And the overshoot problem of the three-station mechanism is effectively solved.

Description

Technical Field

[0001] The invention relates to the field of gas-insulated metal-enclosed switchgear, and in particular to a three-position mechanism opening mechanical braking structure and a braking method. Background Art

[0002] In recent years, with the development of gas-insulated metal switchgear, especially in 126kV common box GIS, three-position isolating grounding switches are more and more widely used. In the transmission process of the three-position isolating grounding switch, a three-position operating mechanism is required to operate, and the mechanism drives the disconnection and connection of the contacts to realize the opening and closing operations. Compared with the closing operation, the load is small during the opening operation, and the mechanism cannot brake quickly after the opening operation is in place, which is prone to overshoot problems, causing the motor to be blocked and unable to start when closing again, and the stability is poor. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a three-station mechanism opening mechanical brake structure and a brake method, so as to improve the stability of the three-station overall structure and provide a guarantee for the stable operation of the high-voltage switch in the power equipment.

[0004] The present invention is achieved through the following technical scheme, which provides a three-station mechanism opening mechanical braking structure and braking method, including a mechanism frame, a main shaft axially connected to the mechanism frame, and a driving plate fixedly connected to the main shaft, and also includes an opening brake assembly and a driving assembly that drives the driving plate to reciprocate. The opening brake assembly includes a support fixedly connected to the mechanism frame, an umbrella-shaped brake block slidably connected to the support, and an elastic assembly that pushes the umbrella-shaped brake block toward the driving plate. A braking protrusion is provided at one end of the umbrella-shaped brake block close to the driving plate, and a driving plate protrusion is provided at the edge of the driving plate.

[0005] The driving assembly in this scheme drives the driving plate to rotate reciprocatingly to realize the rotation of the main shaft, thereby realizing the closing and opening operations. When opening the gate, the driving plate and other transmission components continue to rotate under the action of inertia, and the driving plate protrusion on the driving plate contacts the braking protrusion position on the umbrella-shaped brake block. The driving plate squeezes the umbrella-shaped brake block, and the elastic assembly is gradually compressed. At this time, the driving plate receives resistance from the umbrella-shaped brake block to achieve a braking effect.

[0006] As an optimization, the braking protrusion is long and strip-shaped, and the driving plate is provided with two and arranged along the length direction of the braking protrusion. In this solution, the driving plate protrusions of the two driving plates jointly squeeze the umbrella-shaped braking block, and when the umbrella-shaped braking block is slightly deflected, it can automatically return to the normal position under the squeezing of the two driving plates.

[0007] As an optimization, the umbrella-shaped brake block comprises an umbrella cover and an umbrella handle, the umbrella handle passes through the support, and the brake protrusion is arranged at an end of the umbrella cover away from the umbrella handle. The sliding guidance of the umbrella-shaped brake block is realized by the umbrella handle passing through the support.

[0008] As an optimization, the umbrella cover is rectangular, and the length dimension of the brake protrusion is 0.8-0.98 times the height of the cavity inside the mechanism frame. In this solution, the length dimension of the brake protrusion is 0.8-0.98 times the height of the cavity inside the mechanism frame, and the umbrella-shaped brake block can only rotate slightly after installation.

[0009] As an optimization, the disc springs are provided in plurality and are arranged in a superimposed manner, thereby increasing the compression stroke.

[0010] As an optimization, one end of the umbrella handle away from the umbrella cover is bolted with a baffle. The baffle prevents the umbrella handle from coming out, and the baffle can be removed by bolts to realize the disassembly of the umbrella-shaped brake block.

[0011] As an optimization, a support mounting hole is opened on the mechanism frame, and the support is mounted on the support mounting hole by bolts. The support in this solution is installed by bolts, which is easy to disassemble and assemble.

[0012] As an optimization, the drive assembly includes lead screws located on both sides of the main shaft, a shifting shaft is fixedly connected to the nut of the lead screw, and a shifting groove adapted to the shifting shaft is opened on the drive plate. The reciprocating rotation of the drive plate is realized by the two lead screws, and the two lead screws respectively realize the isolation opening and closing and the grounding opening and closing.

[0013] As an optimization, the braking protrusion is in the shape of a long strip, with a semicircular cross section and a smooth transition with the end face of the umbrella-shaped brake block, and the driving plate protrusion is in the shape of a semicircle and a smooth transition with the driving plate, so that the contact between the braking protrusion and the driving plate protrusion is an arc surface contact, making the contact smooth and preventing impact.

[0014] A three-position mechanism brake opening method using a mechanical brake structure comprises the following steps: a. After receiving the opening command, the drive assembly drives the drive plate to rotate around the main shaft. When the drive plate is about to turn to the opening position, the motor of the drive assembly is powered off, and the drive plate and other transmission parts continue to rotate under the action of inertia; b. After the driving plate continues to rotate, the protrusion of the driving plate contacts the brake protrusion on the umbrella-shaped brake block, and the driving plate squeezes the umbrella-shaped brake block. The umbrella-shaped brake block slides under the squeezing action of the driving plate and compresses the elastic component at the same time. At this time, the driving plate is subjected to the resistance from the umbrella-shaped brake block. Finally, when the driving plate stops, the brake protrusion, the driving plate protrusion and the main shaft are in a straight line; c. After receiving the closing command, the drive assembly drives the drive plate to rotate around the main shaft, the brake protrusion is disengaged from the drive plate protrusion, and the elastic assembly is released. The beneficial effects of the present invention are as follows: a three-station mechanism opening mechanical braking structure and braking method of the present invention, when opening the gate, the driving plate protrusion on the driving plate contacts the braking protrusion position on the umbrella-shaped brake block, the driving plate squeezes the umbrella-shaped brake block, and the elastic component is gradually compressed. At this time, the driving plate receives the resistance from the umbrella-shaped brake block to achieve a braking effect, thereby enabling the mechanism to quickly brake when the gate is in place. The structure is simple and reliable, and effectively solves the overshoot problem of the three-station mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a cross-sectional view in the main axis direction of the present invention; Figure 3 It is a partial enlarged view of the brake assembly of the present invention; Figure 4 It is a front view of the umbrella-shaped brake pad of the present invention; Figure 5 A top view of the umbrella-shaped brake pad of the present invention; Figure 6 It is a left side view of a partial cross section of an umbrella-shaped brake pad of the present invention; Figure 7 This is the front view of the practical driver board; As shown in the figure: 1. Mechanism frame, 2. Screw, 3. Drive plate, 4. Spindle, 5. Nut, 6. Baffle, 7. Umbrella-shaped brake block, 8. Support, 9. Disc spring. DETAILED DESCRIPTION

[0016] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0017] like Figures 1 to 7 As shown, a three-station mechanism brake-opening mechanical brake structure and a braking method of the present invention include a mechanism frame 1, a main shaft 4 axially connected to the mechanism frame 1, and a drive plate 3 fixedly connected to the main shaft 4, as shown in FIG. Figure 1 As shown, the driving plate 3 is symmetrically arranged with a horizontal axis passing through the center of the main shaft 4 as a symmetry axis.

[0018] It also includes a driving assembly for driving the driving plate 3 to reciprocate, and the driving assembly includes screws 2 located on both sides of the main shaft 4. Motors are installed at the right ends of the two screws 2 to drive the two screws 2 to rotate respectively.

[0019] A shifting shaft is fixedly connected to the nut 5 of the lead screw 2, and a shifting slot adapted to the shifting shaft is provided on the drive plate 3. The shifting shaft is inserted into the shifting slot to drive the drive plate 3 to rotate, the lead screw below drives the drive plate 3 to realize the opening and closing of the isolation, and the lead screw above drives the drive plate 3 to realize the opening and closing of the grounding side.

[0020] It also includes a brake assembly, which includes a support 8 fixed to the mechanism frame 1, an umbrella-shaped brake block 7 slidably connected to the support 8, and an elastic component that pushes the umbrella-shaped brake block 7 toward the driving plate 3. The mechanism frame 1 is provided with a support mounting hole, and the support 8 is mounted on the support mounting hole by bolts. The support 8 is provided with a central through hole, and the axis of the central through hole passes through the center of the main shaft 4. The umbrella-shaped brake block 7 slides in the central through hole.

[0021] The end of the umbrella-shaped brake block 7 close to the driving plate 3 is provided with a brake protrusion, such as Figure 3-5 As shown, the braking protrusion is in the shape of an elongated strip, has a semicircular cross section and smoothly transitions with the end surface of the umbrella-shaped braking block 7. In this embodiment, two driving plates 3 are provided and arranged along the length direction of the braking protrusion.

[0022] The edge of the driving plate 3 is provided with a driving plate protrusion which is also semicircular and smoothly transitions with the driving plate 3 .

[0023] The umbrella-shaped brake block 7 includes an umbrella cover and an umbrella handle. The umbrella handle is a circular axis perpendicular to the umbrella cover. The umbrella handle passes through the support 8. The brake protrusion is arranged at one end of the umbrella cover away from the umbrella handle and is integrally formed.

[0024] The umbrella cover is rectangular, and the length of the brake protrusion is 0.8-0.98 times the height of the internal cavity of the mechanism frame 1. Figure 2 As shown, the height of the internal cavity of the mechanism frame 1 refers to the cavity size corresponding to the length direction of the braking protrusion, so that the umbrella cover can only rotate slightly.

[0025] The elastic component comprises a disc spring 9 arranged between the umbrella cover and the support 8. The disc spring 9 is sleeved on the umbrella handle. In order to increase the compression stroke, a plurality of disc springs 9 can be provided.

[0026] The end of the umbrella handle away from the umbrella cover is bolted with a baffle 6. The baffle 6 is fixed to the end threaded hole of the umbrella handle by a bolt passing through the baffle 6.

[0027] The method of using the present invention: The two screws realize the opening and closing of isolation and the opening and closing of grounding respectively. Take the closing and opening of the isolation side as an example: When the isolation closing command is received, the motor on the lower isolation side rotates forward, driving the lower lead screw to rotate forward, and the lead screw drives the nut to move linearly along the guide groove on the mechanism frame. When the nut's shifting shaft moves into the shifting groove of the drive plate, the nut pushes the drive plate to rotate clockwise around the main shaft 4, and the main shaft is then output after the primary gear transmission. Figure 1 After reaching the middle position shown, the driving plate protrusion on the driving plate slowly disengages from the umbrella-shaped brake block, and the umbrella-shaped brake block 7 slides to the right under the action of the disc spring until the baffle 6 presses the support 8. When the switch is in place, the nut's shifting shaft disengages from the shifting groove of the driving plate, the motor is powered off, and the driving plate stops rotating.

[0028] When the isolation opening command is received, the lower isolation side motor rotates in the opposite direction, driving the lower lead screw to rotate in the opposite direction. The lead screw drives the nut to move linearly along the guide groove on the mechanism frame. When the nut's shifting shaft moves into the shifting groove of the drive plate, the nut pushes the drive plate to rotate counterclockwise around the main shaft, and the main shaft is then output after the primary gear transmission. Figure 1 When the brake is in the open position as shown, the motor is powered off, and the drive plate and other transmission parts continue to rotate under the action of inertia. The drive plate protrusion on the drive plate contacts the brake protrusion on the umbrella-shaped brake block, and the drive plate squeezes the umbrella-shaped brake block. The umbrella-shaped brake block slides to the left in the support hole under the squeezing action of the drive plate, and the disc spring is gradually compressed. At this time, the drive plate receives resistance from the umbrella-shaped brake block. As the drive plate rotates, the displacement of the umbrella-shaped brake block gradually increases, the compression of the disc spring also increases, the resistance to the drive plate also gradually increases, and the kinetic energy of the system gradually decreases. Since the final stop position of the drive plate is determined by the three-position mechanism and is a fixed position, the drive plate is rotated to Figure 1 The isolation is completed in the position shown.

[0029] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A three-position mechanism-disconnecting mechanical brake structure, comprising a mechanism frame (1), a main shaft (4) axially connected to the mechanism frame (1), and a drive plate (3) fixedly connected to the main shaft (4), characterized in that: It also comprises a brake assembly for opening the brake and a driving assembly for driving the driving plate (3) to reciprocate, the brake assembly for opening the brake comprising a support (8) fixedly connected to the mechanism frame (1), an umbrella-shaped brake block (7) slidably connected to the support (8), and an elastic assembly for pushing the umbrella-shaped brake block (7) in the direction of the driving plate (3), a brake protrusion being provided at one end of the umbrella-shaped brake block (7) close to the driving plate (3), and a driving plate protrusion being provided at the edge of the driving plate (3).

2. A three-position mechanism brake opening mechanical brake structure according to claim 1, characterized in that: The braking protrusion is in the shape of an elongated strip, and two driving plates (3) are provided and arranged along the length direction of the braking protrusion.

3. A three-position mechanism opening mechanical brake structure according to claim 1, characterized in that: The umbrella-shaped brake block (7) comprises an umbrella cover portion and an umbrella handle portion, the umbrella handle portion passes through a support (8), and the brake protrusion is arranged at an end of the umbrella cover portion away from the umbrella handle portion.

4. A three-position mechanism opening mechanical brake structure according to claim 3, characterized in that: The umbrella cover is rectangular, and the length dimension of the braking protrusion is 0.8-0.98 times the height of the internal cavity of the mechanism frame (1).

5. A three-position mechanism opening mechanical brake structure according to claim 3, characterized in that: The elastic component comprises a disc spring (9) arranged between the umbrella cover and the support (8).

6. A three-position mechanism opening mechanical brake structure according to claim 3, characterized in that: One end of the umbrella handle away from the umbrella cover is bolted to a baffle (6).

7. A three-position mechanism brake opening mechanical brake structure according to claim 1, characterized in that: A support mounting hole is provided on the mechanism frame (1), and the support (8) is mounted on the support mounting hole by means of bolts.

8. A three-position mechanism opening mechanical brake structure according to claim 1, characterized in that: The driving assembly comprises a lead screw (2) located on both sides of a main shaft (4), a shifting shaft is fixedly connected to a nut (5) of the lead screw (2), and a shifting groove adapted to the shifting shaft is formed on the driving plate (3).

9. A three-position mechanism opening mechanical brake structure according to claim 1, characterized in that: The braking protrusion is in the shape of an elongated strip, has a semicircular cross section and smoothly transitions to the end surface of the umbrella-shaped braking block (7), and the driving plate protrusion is in the shape of a semicircle and smoothly transitions to the driving plate (3).

10. A three-position mechanism brake opening method using the mechanical brake structure according to any one of claims 1 to 9, characterized in that: The steps include: a. After receiving the opening command, the drive assembly drives the drive plate (3) to rotate around the main shaft (4). When the drive plate (3) is about to rotate to the opening position, the motor of the drive assembly is powered off, and the drive plate and other transmission components continue to rotate under the action of inertia; b. After the driving plate continues to rotate, the protrusion of the driving plate contacts the braking protrusion on the umbrella-shaped braking block, and the driving plate squeezes the umbrella-shaped braking block. The umbrella-shaped braking block slides under the squeezing action of the driving plate and compresses the elastic component at the same time. At this time, the driving plate is subjected to the resistance from the umbrella-shaped braking block. Finally, when the driving plate stops, the braking protrusion, the driving plate protrusion and the main shaft (4) are in a straight line; c. After receiving the closing command, the drive assembly drives the drive plate (3) to rotate around the main shaft (4), the brake protrusion is disengaged from the drive plate protrusion, and the elastic assembly is released.

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