Bidirectional safety tongs for elevator

Abstract

The invention discloses a pair of bidirectional safety tongs for an elevator. The bidirectional safety tongs comprise a safety tongs frame, a bolt assembly, a tongs body assembly and a lifting 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 on 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 an upper wedge block and a lower wedge block; an upper inclined surface and a lower inclined surface are arranged on one side of a ball of the ball back plate, an upper clamping groove consistent with the inclined direction of the upper inclined surface is formed in the upper part of the mounting plate, and a first lower clamping groove consistent with the inclined direction of the lower inclined surface and a second lower clamping groove consistent with the inclined direction of the upper inclined surface are formed in the lower part of the mounting plate; 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 inclination angle of the upper clamping groove enables the two opposite upper wedge blocks to get close to each other when moving upwards and get away from each other when moving downwards.

Description

Technical Field

[0001] The invention relates to the technical field of elevators, and in particular to a bidirectional safety clamp for elevators. Background Art

[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 limiter is triggered, the pulling mechanism will pull the safety clamp wedge to clamp the elevator guide rail to brake the car or counterweight.

[0003] The safety clamps of most elevators are only triggered when the elevator is overspeeding when going down or the car falls accidentally, which cannot meet the requirements of braking when the elevator is overspeeding when going up. In addition, the braking force required for the counterweight to pull the car when going up is smaller than when the car falls accidentally. The existing safety clamps cannot simultaneously meet the requirements of braking when going down and overspeeding when going up, as well as the requirements of different braking forces up and down. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a bidirectional elevator safety clamp, comprising 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 through the bolt assembly;

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

[0006] The ball side of the ball back plate has an upper inclined surface and a lower inclined surface, the upper part of the mounting plate has an upper groove in the same direction as the upper inclined surface, and the lower part of the mounting plate has a first lower groove in the same direction as the lower inclined surface and a second lower groove in the same direction as the upper inclined surface;

[0007] 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 inclination angle of the upper clamping groove makes the two upper wedge blocks move closer to each other when moving upward and move away from each other when moving downward;

[0008] The lower wedge block can move up and down along the upper slot, the first lower slot or the second lower slot; when the lower wedge block moves up and down along the first lower slot, the back of the lower wedge block leans against the lower inclined surface, and the inclination angle of the first lower slot makes the two lower wedge blocks move away from each other when moving upward and move closer to each other when moving downward; when the lower wedge block moves up and down along the upper slot and the second lower slot, the back of the lower wedge block does not lean against the lower inclined surface, and the inclination angles of the second lower slot and the upper slot are the same, so that the two lower wedge blocks move closer to each other when moving upward and move away from each other when moving downward;

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

[0010] Preferably, the upper wedge block has first protrusions on both sides, and the first protrusions are accommodated in the upper grooves; the lower wedge block has second protrusions on both sides, and the second protrusions are accommodated in the first lower groove or the second lower groove.

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

[0012] Preferably, the upper clamping slot has a limiting portion, and the limiting portion prevents the first protrusion from entering the first lower clamping slot.

[0013] Preferably, the contact portion between the upper wedge block and the lower wedge block has a mortise and tenon structure, the upper wedge block has a mortise groove, and the lower wedge block has a tenon.

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

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

[0016] Preferably, the lifting rod has a spring, one end of the spring abuts against the connection between the lifting rod and the lower wedge block, and the other end of the spring abuts against the safety clamp frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

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

[0019] Figure 3 Schematic diagram of the angles between the upper inclined surface, the lower inclined surface and the vertical direction in Example 1. DETAILED DESCRIPTION

[0020] The following describes the implementation methods of the present invention through specific specific embodiments, and those skilled in the art can fully understand other advantages and technical effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through different specific implementation methods, and the details in this specification can also be applied based on different viewpoints, and various modifications or changes can be made without deviating from the overall design concept of the invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other in the absence of conflict. The following exemplary embodiments of the present invention can be implemented in a variety of different forms and should not be interpreted as being limited to the specific embodiments described 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 specific embodiments to those skilled in the art.

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

[0022] The caliper body assembly 2 is connected to the safety caliper frame 1 through a bolt assembly 23. The caliper body assembly includes a U-shaped spring 21, a ball assembly 22, a ball backing 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 on the ball backing plate 27, and the ball backing plate 27 is pressed against the U-shaped spring 21 through the bolt assembly 23;

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

[0024] The back of the upper wedge block 24 leans against the upper inclined surface and can move up and down along the upper slot 281; the inclination angle of the upper slot 281 makes the two upper wedge blocks 24 move closer to each other when moving upward and move away from each other when moving downward;

[0025] The lower wedge block 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 block 25 moves up and down along the first lower slot 282, the back of the lower wedge block 25 leans against the lower inclined surface, and the inclination angle of the first lower slot 282 makes the two lower wedge blocks 25 move away from each other when moving upward and move closer to each other when moving downward; when the lower wedge block 25 moves up and down along the upper slot 281 and the second lower slot 283, the back of the lower wedge block 25 does not lean against the lower inclined surface, and the inclination angle of the second lower slot 283 and the upper slot 281 is the same, so that the two lower wedge blocks 25 move closer to each other when moving upward and 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 and the first lower slot 282 have the same inclination angle; the lifting rod 3 is fixedly connected to the lower wedge 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 block 24 has first protrusions on both sides, which are accommodated in the upper clamping groove 281; the lower wedge block 25 has second protrusions on both sides, which are accommodated in the first lower clamping groove 282 or the second lower clamping groove 283. The upper clamping groove 281 has a limiting portion, which prevents the first protrusion from entering the first lower clamping groove 282.

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

[0029] The contact portion between the upper wedge block 24 and the lower wedge block 25 has a mortise and tenon structure, the upper wedge block 24 has a mortise groove, and the lower wedge block 25 has 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 gear frame 1 .

[0031] When the elevator is operating normally, the upper wedge block 24 and the lower wedge block 25 can maintain their initial positions and prevent malfunctions through the spring 31 in the lifting rod; when the elevator is overspeeding when going downward, the lifting rod 3 lifts up the lower wedge block 25, and the tenon of the lower wedge block 25 is inserted into the tenon groove of the upper wedge block 24, driving the upper wedge block 24 to move together and clamp the guide rail, thereby achieving the effect of braking the car; when the elevator is overspeeding when going upward, the lifting rod 3 pulls the lower wedge block 25, and the upper wedge block 24 cannot move due to the limiting part of the card slot 281 on the mounting plate 28, and only the lower wedge block 25 clamps the guide rail, thereby achieving the effect of braking the car.

[0032] The braking force adjustment method of this embodiment is to change the contact area between the wedge block and the guide rail when the upward overspeed and the downward overspeed occur, thereby realizing the adjustment of the braking force when the upward overspeed and the downward overspeed occur, and finally realizing the safety caliper braking.

[0033] The inclined angles of the upper and lower parts of the ball back plate and the wedge block can be changed. For example, the angle A1 between the upper inclined surface and the vertical direction and the angle A2 between the lower inclined surface and the vertical direction can be set to be different, thereby changing the positive pressure on the wedge block and achieving the purpose of adjusting the braking force during upward and downward overspeeding.

[0034] The present invention has been described in detail above through specific implementation modes and embodiments, but these do not constitute limitations of the present invention. Without departing from the principles of the present invention, those skilled in the art may also make many variations and improvements, which should also be regarded as the protection scope of the present invention.

Claims

1. An elevator bidirectional safety clamp, 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 through the bolt assembly; The caliper assembly includes a U-shaped spring, a ball assembly, a ball backing plate, a wedge assembly and a mounting plate; the mounting plate is fixed to the ball backing plate, and the ball backing plate is pressed on the U-shaped spring by a bolt assembly; the wedge assembly includes an upper wedge and a lower wedge; The ball side of the ball back plate has an upper inclined surface and a lower inclined surface, the upper part of the mounting plate has an upper groove in the same direction as the upper inclined surface, and the lower part of the mounting plate has a first lower groove in the same direction as the lower inclined surface and a second lower groove in the same direction as 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 inclination angle of the upper clamping groove makes the two upper wedge blocks move closer to each other when moving upward and move away from each other when moving downward; The lower wedge block can move up and down along the upper slot, the first lower slot or the second lower slot; when the lower wedge block moves up and down along the first lower slot, the back of the lower wedge block leans against the lower inclined surface, and the inclination angle of the first lower slot makes the two lower wedge blocks move away from each other when moving upward and move closer to each other when moving downward; when the lower wedge block moves up and down along the upper slot and the second lower slot, the back of the lower wedge block does not lean against the lower inclined surface, and the inclination angles of the second lower slot and the upper slot are the same, so that the two lower wedge blocks move closer to each other when moving upward and move away from each other when moving downward; The upper inclined surface and the upper clamping groove have the same inclination angle, and the lower inclined surface and the first lower clamping groove have the same inclination angle; 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 block has first protrusions on both sides, and the first protrusions are accommodated in the upper clamping grooves; the lower wedge block has second protrusions on both sides, and the second protrusions are accommodated in the first lower clamping groove or the second lower clamping groove.

3. The elevator bidirectional safety clamp according to claim 2, characterized in that: The upper wedge block and the lower wedge block have a wedge block back plate, and the first protrusion and the second protrusion are located on both sides of the wedge block back plate.

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

5. The elevator bidirectional safety clamp according to claim 1, characterized in that: The contact parts of the upper wedge block and the lower wedge block have a mortise and tenon structure, the upper wedge block has a mortise groove, and the lower wedge block has a tenon.

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

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

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

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