Progressive safety tongs

Abstract

The utility model discloses a pair of progressive safety tongs, which comprises a safety tongs body (1), a first mounting end (2) is provided with a fixed tongs block (4) and a cover plate (5), a second mounting end (3) is provided with a movable tongs block (6), a guide pressing plate (7) and a roller pin row (8), and the first mounting end (2) is provided with a flat spring (11). The flat plate spring (11) is connected to the first installation end (2) and elastically deforms due to abutting, the fixed clamp block (4) is connected with the flat plate spring (11), the flat plate spring (11) pushes the fixed clamp block (4) to face the elevator guide rail, and in the braking state, the fixed clamp block (4) and the movable clamp block (6) are tightly attached to the side wall of the elevator guide rail for braking. According to the safety tongs, an elastic clamping ring in the prior art is omitted, the two ends of the plate spring directly abut against the safety tongs body, therefore, elastic force is transmitted more directly and completely, the structure is simpler, and reliability is better.

Description

Technical Field

[0001] This utility model relates to the field of elevator component technology, specifically a progressive safety clamp. Background Technology

[0002] Currently, a progressive safety clamp has been disclosed, including a clamp body with a brake groove. The clamp body is precision cast. A left cover plate and a right cover plate are fixed to the clamp body by bolts. In the brake groove of the clamp body, under the left cover plate, two leaf springs and a movable wedge are installed side by side from left to right. In the brake groove of the clamp body, under the right cover plate, a fixed wedge and a slider that can slide along the inclined surface of the fixed wedge are installed from right to left, with the inclined surface of the fixed wedge facing the movable wedge. The leaf springs can be one, three, or four, and are fixed vertically to the clamp body by elastic clamps. The movable wedge can move left and right within the clamp body's braking groove, guided by the upper and lower groove walls. A cylindrical pin is located at the transverse central axis of the movable wedge, with its protruding end extending out of a transverse elongated hole in the left cover plate. The length of this transverse elongated hole is less than mm. After the progressive safety clamp of this invention is assembled and tested, the cylindrical pin is located at the right end of the transverse elongated hole, and the surface of the movable wedge in contact with the leaf spring is an arc surface. The fixed wedge is fixed in the clamp body's braking groove by bolts. Two cylindrical pins are provided on the slider, and the line connecting these two cylindrical pins is parallel to the inclined surface of the fixed wedge. The distance from any point on this line to the inclined surface of the fixed wedge is equal, and the protruding end of the cylindrical pin extends out of a guide elongated hole in the right cover plate. Between the movable wedge and the slider is a guide rail for the elevator car to move up and down, with a gap between the guide rail and the movable wedge and slider. The safety clamp with the above structure has the following shortcomings: the leaf springs are arranged side by side and fixed to the clamp body vertically by elastic clamps. Although the spring force can be adjusted by the number of leaf springs, the spring force is transmitted to the movable block through the elastic clamps, which will offset the spring force of a portion of the leaf springs. This results in the need for better leaf springs or even better leaf springs, which increases the design difficulty because it is necessary to calculate the rebound force offset by the elastic clamps. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a progressive safety clamp that eliminates the elastic clamping device in the prior art, so that the two ends of the leaf spring directly abut against the safety clamp body, thereby transmitting the elastic force more directly and completely, with a simpler structure and better reliability.

[0004] The technical solution of this utility model is to provide a progressive safety clamp with the following structure: a safety clamp body, one side of which is a first mounting end and the other side is a second mounting end, and a channel for installing an elevator guide rail is formed between the first mounting end and the second mounting end; a fixed clamp block and a cover plate are installed on the first mounting end, and a movable clamp block, a guide pressure plate, and a needle roller array are installed on the second mounting end; the second mounting end has a first inclined surface, and the movable clamp block has a second inclined surface, which is attached to the first inclined surface by the needle roller array; the first mounting end is provided with a flat spring, which is connected to the first mounting end and undergoes elastic deformation due to abutment; the fixed clamp block is connected to the flat spring, and the flat spring pushes the fixed clamp block toward the elevator guide rail; in the normal state, there is a gap between the fixed clamp block and the side wall of the elevator guide rail; in the braking state, the fixed clamp block and the movable clamp block are tightly attached to the side wall of the elevator guide rail and stop.

[0005] The safety clamp body is provided with a first positioning block and a second positioning block. A pressure plate is provided between the flat spring and the fixed clamp block. The pressure plate is located in the channel between the first positioning block and the second positioning block and moves along the direction of the vertical elevator guide rail.

[0006] The safety clamp body is provided with a first positioning post and a second positioning post. The first positioning post is embedded in the first groove of the safety clamp body and protrudes into the first groove to abut against the top outer sidewall of the plate spring. The second positioning post is embedded in the second groove of the safety clamp body and protrudes into the second groove to abut against the bottom outer sidewall of the plate spring.

[0007] The top inner sidewall of the flat spring has a gap between it and the first positioning block, and between it and the second positioning block.

[0008] A gasket is provided between the pressure plate and the flat spring. The gasket has a protruding end and is located in the first long groove of the cover plate.

[0009] The bottom of the safety clamp body is equipped with an adjustment structure for adjusting the distance between the fixed clamp block and the elevator guide rail. The adjustment structure includes a bracket, a screw, and a spring. One end of the bracket is fixed to the bottom of the fixed clamp block, and the other end is located at the bottom of the safety clamp body. The bracket has an elongated hole. The spring is fitted onto the screw, and the screw passes through the elongated hole and is tightened onto the fixed clamp block, thereby pressing the bracket tightly against the bottom of the safety clamp body. After the screw is released, the bracket moves along the direction perpendicular to the elevator guide rail. After the movement is completed, the screw is tightened again to fix the bracket, thereby adjusting the distance between the fixed clamp block and the elevator guide rail.

[0010] The cover plate is provided with two second long slots, and the fixing clamp is provided with a first guide rod and a second guide rod, which are respectively embedded in the corresponding second long slot.

[0011] With the above structure, this utility model has the following advantages: 1. It eliminates the elastic clamping device in the prior art, allowing the two ends of the leaf spring to directly abut against the safety clamp body, thus transmitting the elastic force more directly and completely, resulting in a simpler structure and better reliability. 2. The leaf spring exhibits excellent fatigue resistance and high reliability under cyclic loads of repeated compression and release. 3. The leaf spring does not require preload adjustment; a fixed preload is achieved according to the design, reducing maintenance difficulty.

[0012] As an improvement, the safety clamp body is provided with a first positioning block and a second positioning block, and a pressure plate is provided between the flat spring and the fixed clamp block. The pressure plate is located in the channel between the first positioning block and the second positioning block and moves along the direction of the vertical elevator guide rail. The pressure plate plays the role of elastic force transmission, so that the middle elastic force of the flat spring is transmitted to the fixed clamp block.

[0013] As an improvement, the safety clamp body is provided with a first positioning post and a second positioning post. The first positioning post is embedded in the first groove of the safety clamp body and protrudes into the first groove to abut against the top outer sidewall of the plate spring. The second positioning post is embedded in the second groove of the safety clamp body and protrudes into the second groove to abut against the bottom outer sidewall of the plate spring. The diameter of the first positioning post and the second positioning post can be changed to adjust the spacing.

[0014] As an improvement, the bottom of the safety clamp body is provided with an adjustment structure for adjusting the distance between the fixed clamp block and the elevator guide rail. The adjustment structure includes a bracket, a screw, and a spring. One end of the bracket is fixed to the bottom of the fixed clamp block, and the other end is located at the bottom of the safety clamp body. The bracket has an elongated hole. The spring is fitted onto the screw, and the screw passes through the elongated hole and is tightened onto the fixed clamp block, thereby pressing the bracket tightly against the bottom of the safety clamp body. After the screw is released, the bracket moves along the direction perpendicular to the elevator guide rail. After the movement is completed, the screw is tightened again to fix the bracket, thereby adjusting the distance between the fixed clamp block and the elevator guide rail. When the safety clamp is reset, the fixed clamp block can be moved first, thereby moving away from the guide rail by one distance, and then positioned and fixed by the screw, making the reset operation easier. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the safety clamp of this utility model.

[0016] Figure 2 This is a schematic diagram of the split structure of the safety clamp of this utility model.

[0017] Figure 3 This is a schematic diagram of the exploded structure of the safety clamp of this utility model.

[0018] Figure 4 This is a schematic diagram showing the separation of the flat spring and the fixing clamp block of this utility model.

[0019] Figure 5 This is a schematic diagram of the structure of the flat spring and fixing clamp block of this utility model.

[0020] Figure 6 This is a schematic diagram of the installation of the adjustment structure of this utility model from one angle.

[0021] Figure 7 This is a schematic diagram of the installation of the adjustment structure of this utility model from the second perspective.

[0022] The figure shows: 1. Safety clamp body, 2. First mounting end, 3. Second mounting end, 4. Fixed clamp block, 5. Cover plate, 6. Movable clamp block, 7. Guide pressure plate, 8. Needle roller array, 9. First inclined surface, 10. Second inclined surface, 11. Flat spring, 12. Pressure plate, 13. First positioning block, 14. Second positioning block, 15. First positioning post, 16. Second positioning post, 17. Washer, 18. Bracket, 19. Screw, 20. Spring, 21. Long hole, 22. First long groove, 23. Second long groove, 24. First guide rod, 25. Second guide rod. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] like Figure 1-7 As shown, the progressive safety clamp of this utility model includes a safety clamp body 1. One side of the safety clamp body 1 is a first mounting end 2, and the other side is a second mounting end 3. The space between the first mounting end 2 and the second mounting end 3 is a channel for installing elevator guide rails. The first mounting end 2 is equipped with a fixed clamp block 4 and a cover plate 5. The second mounting end 3 is equipped with a movable clamp block 6, a guide pressure plate 7, and a needle roller array 8. The second mounting end 3 has a first inclined surface 9, and the movable clamp block 6 has a second inclined surface 10. The second inclined surface 10 is attached to the first inclined surface 9 through the needle roller array 8. When braking, the lifting plate moves the movable clamp block 6 upward, and at the same time, the second inclined surface 10 is attached to the needle roller array 8 on the first inclined surface 9 and moves upward.

[0025] The first mounting end 2 is provided with a flat spring 11. The flat spring 11 is connected to the first mounting end 2 and undergoes elastic deformation due to abutment. The fixing clamp 4 is connected to the flat spring 11. The flat spring 11 pushes the fixing clamp 4 toward the direction of the elevator guide rail. In the normal state, the fixing clamp 4 is spaced from the side wall of the elevator guide rail. In the braking state, the fixing clamp 4 and the movable clamp 6 are tightly attached to the side wall of the elevator guide rail and stop.

[0026] like Figure 2As shown, the safety clamp body 1 is provided with a first positioning block 13 and a second positioning block 14. A pressure plate 12 is provided between the flat spring 11 and the fixed clamp block 4. The pressure plate 12 is located in the channel between the first positioning block 13 and the second positioning block 14 and moves along the direction of the vertical elevator guide rail. The first positioning block 13 and the second positioning block 14 guide the pressure plate. The left side wall on the same side can also position the right side wall of the flat spring 11, positioning the flat spring 11 in a cavity.

[0027] The safety clamp body 1 is provided with a first positioning post 15 and a second positioning post 16. The first positioning post 15 is embedded in the first groove of the safety clamp body 1 and protrudes into the first groove to abut against the top outer sidewall of the plate spring 11. The second positioning post 16 is embedded in the second groove of the safety clamp body 1 and protrudes into the second groove to abut against the bottom outer sidewall of the plate spring 11. The two ends of the plate spring 11 make line contact with the first positioning post 15 and the second positioning post 16, which can better support the ends of the plate spring 11.

[0028] The inner top sidewall of the flat spring 11 is provided with a gap between itself and the first positioning block 13 and the second positioning block 14, providing space for the flat spring 11 to deform.

[0029] like Figure 1 and Figure 4 As shown, a gasket 17 is provided between the pressure plate 12 and the flat spring 11. The gasket 17 has a protruding end and is located in the first elongated groove 22 of the cover plate 5. The first elongated groove 22 guides the protruding end of the gasket 17 when it moves laterally.

[0030] like Figure 3 and Figure 5 As shown, the bottom of the safety clamp body 1 is equipped with an adjustment structure for adjusting the distance between the fixed clamp block 4 and the elevator guide rail. The adjustment structure includes a bracket 18, a screw 19, and a spring 20. One end of the bracket 18 is fixed to the bottom of the fixed clamp block 4, and the other end is located at the bottom of the safety clamp body 1. The bracket 18 has an elongated hole 21. The spring 20 is sleeved on the screw 19, and the screw 19 passes through the elongated hole 21 and is tightened onto the fixed clamp block 4, thereby pressing the bracket 18 tightly against the bottom of the safety clamp body 1. After the screw 19 is loosened, the bracket 18 moves along the direction perpendicular to the elevator guide rail. After the movement is completed, the screw 19 is tightened again to fix the bracket 18, thereby adjusting the distance between the fixed clamp block 4 and the elevator guide rail. When the safety clamp is reset after stopping, the fixed clamp block 4 can be moved away from the elevator guide rail by the adjustment structure for easy reset.

[0031] like Figure 3As shown, the cover plate 5 has two second long slots 23, and the fixing clamp block 4 has a first guide rod 24 and a second guide rod 25, which are respectively embedded in the corresponding second long slot 23. Lateral positioning is achieved when the fixing clamp block 4 moves up and down in the stopped state.

Claims

1. A progressive safety clamp, comprising a clamp body (1), wherein one side of the clamp body (1) is a first mounting end (2) and the other side is a second mounting end (3), and the space between the first mounting end (2) and the second mounting end (3) is a channel for installing elevator guide rails; the first mounting end (2) is equipped with a fixed clamp block (4) and a cover plate (5), the second mounting end (3) is equipped with a movable clamp block (6), a guide pressure plate (7) and a needle roller array (8), the second mounting end (3) is provided with a first inclined surface (9), the movable clamp block (6) is provided with a second inclined surface (10), and the second inclined surface (10) is attached to the first inclined surface (9) by the needle roller array (8), characterized in that: The first mounting end (2) is provided with a flat spring (11). The flat spring (11) is connected to the first mounting end (2) and undergoes elastic deformation due to abutment. The fixed clamp (4) is connected to the flat spring (11). The flat spring (11) pushes the fixed clamp (4) toward the direction of the elevator guide rail. In the normal state, the fixed clamp (4) is spaced from the side wall of the elevator guide rail. In the braking state, the fixed clamp (4) and the movable clamp (6) are pressed tightly against the side wall of the elevator guide rail and stop.

2. The progressive safety clamp according to claim 1, characterized in that: The safety clamp body (1) is provided with a first positioning block (13) and a second positioning block (14). A pressure plate (12) is provided between the flat spring (11) and the fixed clamp block (4). The pressure plate (12) is located in the channel between the first positioning block (13) and the second positioning block (14) and moves along the direction of the vertical elevator guide rail.

3. The progressive safety clamp according to claim 1, characterized in that: The safety clamp body (1) is provided with a first positioning post (15) and a second positioning post (16). The first positioning post (15) is embedded in the first groove of the safety clamp body (1) and protrudes into the first groove to abut against the top outer sidewall of the plate spring (11). The second positioning post (16) is embedded in the second groove of the safety clamp body (1) and protrudes into the second groove to abut against the bottom outer sidewall of the plate spring (11).

4. The progressive safety clamp according to claim 2, characterized in that: The inner top wall of the flat spring (11) has a gap between it and the first positioning block (13) and between it and the second positioning block (14).

5. The progressive safety clamp according to claim 2, characterized in that: A gasket (17) is provided between the pressure plate (12) and the flat spring (11). The gasket (17) has a protruding end and is located in the first long groove (22) of the cover plate (5).

6. The progressive safety clamp according to claim 1, characterized in that: The bottom of the safety clamp body (1) is provided with an adjustment structure for adjusting the distance between the fixed clamp block (4) and the elevator guide rail. The adjustment structure includes a bracket (18), a screw (19) and a spring (20). One end of the bracket (18) is fixed to the bottom of the fixed clamp block (4), and the other end is located at the bottom of the safety clamp body (1). The bracket (18) is provided with an elongated hole (21). The spring (20) is sleeved on the screw (19), and the screw (19) passes through the elongated hole (21) and is screwed onto the fixed clamp block (4), thereby pressing the bracket (18) against the bottom of the safety clamp body (1). After the screw (19) is released, the bracket (18) moves along the direction perpendicular to the elevator guide rail. After the movement is completed, the screw (19) is locked to fix the bracket (18), thereby adjusting the distance between the fixed clamp block (4) and the elevator guide rail.

7. The progressive safety clamp according to claim 1, characterized in that: The cover plate (5) is provided with two second long grooves (23), and the fixing clamp block (4) is provided with a first guide rod (24) and a second guide rod (25), which are respectively embedded in the corresponding second long groove (23).

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