Elevator two-way safety gear

Abstract

The application discloses a bidirectional safety clamp for an elevator, which comprises a safety clamp frame, a bolt assembly, a clamp body assembly and a pull rod; the clamp body assembly is connected to the safety clamp frame through the bolt assembly; the clamp body assembly comprises a U-shaped spring, a ball assembly, a ball back plate, a wedge block assembly and a mounting plate; the mounting plate is fixed to the ball back plate, and the ball back plate is pressed on the U-shaped spring through the bolt assembly; the wedge block assembly comprises upper wedge blocks and lower wedge blocks; the ball side of the ball back plate is provided with an upper inclined surface and a lower inclined surface; the upper part of the mounting plate is provided with an upper clamping groove which is consistent with the inclined direction of the upper inclined surface; the lower part of the mounting plate is provided with a first lower clamping groove which is consistent with the inclined direction of the lower inclined surface and a second lower clamping groove which is consistent with the inclined direction of the upper inclined surface; the back of the upper wedge block leans against the upper inclined surface and can move up and down along the upper clamping groove; the inclined angle of the upper clamping groove makes the relative two upper wedge blocks move close to each other when moving upwards and move away from each other when moving downwards.

Description

Technical Field

[0001] This invention relates to the field of elevator technology, and more specifically to a two-way safety clamp for elevators. Background Technology

[0002] As one of the key components of the elevator safety protection system, the elevator safety clamp is generally installed on the car frame or counterweight frame. When the elevator running speed is abnormal and the speed governor is triggered, the lifting mechanism will pull the safety clamp wedge to clamp the elevator guide rail and brake the car or counterweight.

[0003] Most elevator safety brakes only activate when the elevator is descending at excessive speed or when the car unexpectedly falls, failing to meet the requirements for braking during upward speed increases. Furthermore, the counterweight traction of the car during upward speed increases requires less braking force than during an unexpected car fall. Existing safety brakes cannot simultaneously meet the needs of braking during both downward and upward speed increases, as well as the different braking forces required for each direction. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a two-way safety clamp for elevators, including a safety clamp frame, a bolt assembly, a clamp body assembly, and a lifting rod; the clamp body assembly is connected to the safety clamp frame by the bolt assembly.

[0005] The clamp assembly includes a U-shaped spring, a ball bearing assembly, a ball bearing back plate, a wedge assembly, and a mounting plate; the mounting plate is fixed to the ball bearing back plate, and the ball bearing back plate is pressed onto the U-shaped spring by a bolt assembly; the wedge assembly includes an upper wedge and a lower wedge;

[0006] The ball back plate has an upper inclined surface and a lower inclined surface on one side of the ball. The upper part of the mounting plate has an upper groove that is in the same direction as the upper inclined surface. The lower part of the mounting plate has a first lower groove that is in the same direction as the lower inclined surface and a second lower groove that is in the same direction as the upper inclined surface.

[0007] The upper wedge block rests against the upper inclined surface and can move up and down along the upper slot; the inclination angle of the upper slot causes the two opposing upper wedge blocks to move closer to each other when moving upward and further apart when moving downward.

[0008] The lower wedge can move up and down along the upper slot, the first lower slot, or the second lower slot. When the lower wedge moves up and down along the first lower slot, its back rests against the lower inclined surface. The inclination angle of the first lower slot causes the two opposing lower wedges to move away from each other when moving upward and to move closer to each other when moving downward. When the lower wedge moves up and down along the upper slot and the second lower slot, its back does not rest against the lower inclined surface. The inclination angles of the second lower slot and the upper slot are the same, causing the two opposing lower wedges to move closer to each other when moving upward and to move away from each other when moving downward.

[0009] The upper inclined surface and the upper slot have the same inclination angle, and the lower inclined surface has the same inclination angle as the first lower slot; the lifting rod is fixedly connected to the lower wedge block.

[0010] Preferably, the upper wedge has a first protrusion on both sides, which is accommodated in the upper slot; the lower wedge has a second protrusion on both sides, which is accommodated in the first lower slot or the second lower slot.

[0011] Preferably, the upper wedge and the lower wedge have a wedge back plate, and the first protrusion and the second protrusion are located on both sides of the wedge back plate.

[0012] Preferably, the upper slot has a limiting part that prevents the first protrusion from entering the first lower slot.

[0013] Preferably, the contact portion of the upper wedge and the lower wedge has a mortise and tenon structure, with the upper wedge having a mortise groove and the lower wedge having a tenon.

[0014] Preferably, the angle A1 between the upper inclined plane and the vertical direction is the same as the angle A2 between the lower inclined plane and the vertical direction.

[0015] Preferably, the angle A1 between the upper inclined plane and the vertical direction is different from the angle A2 between the lower inclined plane and the vertical direction.

[0016] Preferably, the lifting rod has a spring, one end of which abuts against the connection between the lifting rod and the lower wedge block, and the other end of which abuts against the safety clamp frame. Attached Figure Description

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0018] Figure 1 and Figure 2 This is a schematic diagram of the elevator bidirectional safety clamp structure in Example 1;

[0019] Figure 3 This is a schematic diagram showing the angles between the upper and lower inclined planes and the vertical direction in Example 1. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can fully understand other advantages and technical effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific embodiments, and the details in this specification can also be applied based on different viewpoints, with various modifications or changes made without departing from the overall design concept of the invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. The following exemplary embodiments of the present invention can be implemented in many different forms and should not be construed as being limited to the specific embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the technical solutions of these exemplary embodiments to those skilled in the art.

[0021] like Figures 1 to 3 As shown, this embodiment provides a two-way safety clamp for elevators, including a safety clamp frame 1, a bolt assembly 23, a clamp body assembly 2, and a lifting rod 3.

[0022] The clamp body assembly 2 is connected to the safety clamp frame 1 via bolt assembly 23. The clamp body assembly includes a U-shaped spring 21, a ball bearing assembly 22, a ball bearing back plate 27, a wedge assembly, and a mounting plate 28; the wedge assembly includes an upper wedge 24 and a lower wedge 25. The mounting plate 28 is fixed to the ball bearing back plate 27, and the ball bearing back plate 27 is pressed against the U-shaped spring 21 via bolt assembly 23.

[0023] The ball back plate 27 has an upper inclined surface and a lower inclined surface on one side of the ball. The upper part of the mounting plate 28 has an upper groove 281 corresponding to the inclination direction of the upper inclined surface. The lower part of the mounting plate 28 has a first lower groove 282 consistent with the inclination direction of the lower inclined surface and a second lower groove 283 consistent with the inclination direction of the upper inclined surface.

[0024] The upper wedge 24 rests against the upper inclined surface and can move up and down along the upper slot 281; the inclination angle of the upper slot 281 causes the two relative upper wedges 24 to move closer to each other when moving upward and move further apart when moving downward.

[0025] The lower wedge 25 can move up and down along the upper slot 281, the first lower slot 282, or the second lower slot 283. When the lower wedge 25 moves up and down along the first lower slot 282, its back rests against the lower inclined surface. The inclination angle of the first lower slot 282 causes the two lower wedges 25 to move away from each other when moving upward and to move closer to each other when moving downward. When the lower wedge 25 moves up and down along the upper slot 281 and the second lower slot 283, its back does not rest against the lower inclined surface. The inclination angles of the second lower slot 283 and the upper slot 281 are the same, causing the two lower wedges 25 to move closer to each other when moving upward and to move away from each other when moving downward.

[0026] The upper inclined surface and the upper slot 281 have the same inclination angle, and the lower inclined surface has the same inclination angle as the first lower slot 282; the lifting rod 3 is fixedly connected to the lower wedge block 25. The angle A1 between the upper inclined surface and the vertical direction is the same as the angle A2 between the lower inclined surface and the vertical direction.

[0027] The upper wedge 24 has first protrusions on both sides, which are accommodated in the upper slot 281; the lower wedge 25 has second protrusions on both sides, which are accommodated in the first lower slot 282 or the second lower slot 283. The upper slot 281 has a limiting part that prevents the first protrusions from entering the first lower slot 282.

[0028] The upper wedge 24 and the lower wedge 25 have a wedge back plate 26, and the first protrusion and the second protrusion are located on both sides of the wedge back plate 26.

[0029] The contact portion of the upper wedge 24 and the lower wedge 25 has a mortise and tenon structure, with the upper wedge 24 having a mortise groove and the lower wedge 25 having a tenon.

[0030] The lifting rod 3 has a spring 31. One end of the spring 31 abuts against the connection between the lifting rod 3 and the lower wedge block 25, and the other end of the spring 31 abuts against the safety clamp frame 1.

[0031] When the elevator is running normally, the upper wedge 24 and the lower wedge 25 can maintain their initial positions and prevent malfunctions through the spring 31 in the lifting rod. When the elevator is going down at excessive speed, the lifting rod 3 lifts the lower wedge 25, and the tenon of the lower wedge 25 inserts into the tenon groove of the upper wedge 24, causing the upper wedge 24 to move together to clamp the guide rail, thereby achieving the result of braking the car. When the elevator is going up at excessive speed, the lifting rod 3 pulls the lower wedge 25, and the upper wedge 24 cannot move due to the limiting part of the slot 281 on the mounting plate 28. Only the lower wedge 25 clamps the guide rail, thereby achieving the result of braking the car.

[0032] The braking force adjustment method in this embodiment is to change the contact area between the wedge and the guide rail when the vehicle is overspeeding upwards and downwards, thereby adjusting the braking force when the vehicle is overspeeding upwards and downwards, and finally achieving safety brake braking.

[0033] The angles of the upper and lower parts of the ball back plate and the inclined plane of the wedge can be changed. For example, the angle A1 between the upper inclined plane and the vertical direction and the angle A2 between the lower inclined plane and the vertical direction can be set differently, thereby changing the normal pressure on the wedge and adjusting the braking force when overspeeding upwards and downwards.

[0034] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A bidirectional safety clamp for elevators, characterized in that, It includes a safety clamp frame, a bolt assembly, a clamp body assembly, and a lifting rod; the clamp body assembly is connected to the safety clamp frame via the bolt assembly. The clamp assembly includes a U-shaped spring, a ball bearing assembly, a ball bearing back plate, a wedge assembly, and a mounting plate; the mounting plate is fixed to the ball bearing back plate, and the ball bearing back plate is pressed onto the U-shaped spring by a bolt assembly; the wedge assembly includes an upper wedge and a lower wedge; The ball back plate has an upper inclined surface and a lower inclined surface on one side of the ball. The upper part of the mounting plate has an upper groove that is in the same direction as the upper inclined surface. The lower part of the mounting plate has a first lower groove that is in the same direction as the lower inclined surface and a second lower groove that is in the same direction as the upper inclined surface. The upper wedge block rests against the upper inclined surface and can move up and down along the upper slot; the inclination angle of the upper slot causes the two opposing upper wedge blocks to move closer to each other when moving upward and further apart when moving downward. The lower wedge can move up and down along the upper slot, the first lower slot, or the second lower slot. When the lower wedge moves up and down along the first lower slot, its back rests against the lower inclined surface. The inclination angle of the first lower slot causes the two opposing lower wedges to move away from each other when moving upward and to move closer to each other when moving downward. When the lower wedge moves up and down along the upper slot and the second lower slot, its back does not rest against the lower inclined surface. The inclination angles of the second lower slot and the upper slot are the same, causing the two opposing lower wedges to move closer to each other when moving upward and to move away from each other when moving downward. The upper inclined surface and the upper slot have the same inclination angle, and the lower inclined surface has the same inclination angle as the first lower slot; the lifting rod is fixedly connected to the lower wedge block.

2. The elevator bidirectional safety clamp according to claim 1, characterized in that, The upper wedge has a first protrusion on both sides, which is accommodated in the upper slot; the lower wedge has a second protrusion on both sides, which is accommodated in the first lower slot or the second lower slot.

3. The elevator bidirectional safety clamp according to claim 2, characterized in that, The upper and lower wedges have wedge back plates, and the first and second protrusions are located on both sides of the wedge back plates.

4. The elevator bidirectional safety clamp according to claim 1, characterized in that, The upper slot has a limiting part that prevents the first protrusion from entering the first lower slot.

5. The elevator bidirectional safety clamp according to claim 1, characterized in that, The contact portion of the upper and lower wedges has a mortise and tenon structure, with the upper wedge having a mortise groove and the lower wedge having a tenon.

6. The elevator bidirectional safety clamp according to claim 1, characterized in that, The angle A1 between the upper inclined plane and the vertical direction is the same as the angle A2 between the lower inclined plane and the vertical direction.

7. The elevator bidirectional safety clamp according to claim 1, characterized in that, The angle A1 between the upper inclined plane and the vertical direction is different from the angle A2 between the lower inclined plane and the vertical direction.

8. The elevator bidirectional safety clamp according to claim 1, characterized in that, The lifting rod has a spring, with one end of the spring abutting against the connection between the lifting rod and the lower wedge block, and the other end of the spring abutting against the safety clamp frame.

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