Progressive safety tongs adopting ball structure
By adopting a ball bearing structure and a flat spring instead of a disc spring in the safety clamp design, the instability and maintenance difficulties of the disc spring structure are solved, achieving stable braking and low-cost maintenance.
Patent Information
- Application Number
- CN202520712652.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-15
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-04-15
AI Technical Summary
The disc spring structure in existing safety clamps has problems such as unstable force value, easy fatigue, high maintenance difficulty, easy accumulation of dirt, and unstable braking.
A flat spring is used instead of a disc spring, combined with a ball bearing structure. The balls are in close contact with the elevator guide rail to achieve braking. The deformation of the spring is limited by the ball bearing guide block and the positioning post, providing stable elastic support.
It achieves stable force value, good fatigue resistance, simple maintenance, adaptability to harsh environments, and smooth braking, thus reducing maintenance costs.
Smart Images
Figure CN223936029U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of elevator component technology, specifically a progressive safety clamp using a ball bearing structure. Background Technology
[0002] Safety clamps are an important safety device for elevators, used to clamp the guide rails and stop the elevator in an emergency. Currently, there are braking structures that use single-sided brake clamps, double-sided brake clamps, or brake rollers on one side and brake clamps on the other.
[0003] A current technology discloses a safety clamp, including a fixed base with a guide rail and rollers in contact with the guide rail surface. The roller axles are horizontally mounted on the elevator car or frame. The safety clamp has a movable wedge mechanism on each side of the guide rail, or a wedge mechanism on one side and a movable wedge mechanism on the other side. The movable wedge mechanism includes a reel, a lifting rope, a movable wedge, and an inclined block. The reel is perpendicular to the guide rail, with one end located above the inclined block and the other end connected to the roller. The movable wedge is located below the inclined block and is connected to the reel via the lifting rope. The fixed wedge mechanism includes a fixed wedge, which is fixed to the fixed base by multiple sets of disc spring fixing mechanisms. Multiple anti-slip grooves are evenly distributed on the side of the movable and fixed wedges opposite the guide rail, and these anti-slip grooves are perpendicular to the guide rail. The safety clamp with the above structure has the following disadvantages: 1. Since the fixed wedge is driven by multiple sets of disc springs, and disc springs are elastic elements, multiple disc springs need to be stacked for use, resulting in a large number of springs and unstable force. 2. Disc springs are prone to fatigue under repeated compression and release cyclic loads, especially in safety clamps with frequent operations (such as elevator emergency braking), which may lead to elastic decay or breakage, reducing reliability. 3. Disc springs require precise preload adjustment, relying on professional tools and techniques, making maintenance difficult. 4. Dust and oil contamination between the layers will increase friction, leading to jamming or delayed action. 5. The disc springs have high stiffness, and sudden impacts may cause fluctuations in braking force, affecting braking smoothness. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a progressive safety clamp with a ball bearing structure that modifies the disc spring into a flat spring, resulting in a simple structure, stable force value, high fatigue strength and reliability, simple maintenance, and good braking smoothness.
[0005] The technical solution of this utility model is to provide a progressive safety clamp with a ball bearing structure, comprising a safety clamp body, one side of which is a first mounting end and the other side is a second mounting end, with a channel for installing elevator guide rails between the first and second mounting ends; the first mounting end is equipped with balls and a cover plate, and the second mounting end is equipped with a movable clamp block, a guide pressure plate, and a needle roller array; the second mounting end has a first inclined surface, and the movable clamp block has a second inclined surface, the second inclined surface being attached to the first inclined surface by the needle roller array; the first mounting end is equipped with a flat spring, the flat spring being connected to the first mounting end and undergoing elastic deformation due to abutment; the balls are equipped with ball guide blocks, the ball guide blocks being connected to the flat spring; the flat spring pushes the balls toward the elevator guide rail; in the normal state, there is a gap between the balls and the side wall of the elevator guide rail; in the braking state, the balls are tightly attached to the side wall of the elevator guide rail and stop.
[0006] The safety clamp body is provided with a first positioning block and a second positioning block. The first positioning block is located at the top of the ball guide block, and the second positioning block is located at the bottom of the ball guide block. The ball guide block is vertically limited between the first positioning block and the second positioning block.
[0007] 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.
[0008] 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.
[0009] A gasket is provided between the ball guide block and the flat spring. The gasket has a protruding end and is located in the elongated hole of the cover plate.
[0010] The outer wall of the middle part of the ball is provided with an annular groove, and the arc-shaped opening of the ball guide block is provided with an arc-shaped limiting block. The arc-shaped limiting block is embedded in the annular groove for axial positioning.
[0011] The ball guide block moves linearly along the cavity between the first positioning block and the second positioning block, and the direction of movement is perpendicular to the elevator guide rail.
[0012] With the above structure, this utility model has the following advantages: 1. Modifying the disc spring into a flat spring simplifies the structure and stabilizes the force. 2. The flat spring exhibits excellent fatigue resistance and high reliability under cyclic loads of repeated compression and release. 3. The flat spring eliminates the need for preload adjustment; a fixed preload is achieved according to the design, reducing maintenance difficulty. 4. The surface is smooth, preventing the accumulation of dirt or rust, and its performance is more stable in harsh environments such as humid and dusty conditions. Damaged individual pieces can be replaced separately, reducing maintenance costs. 5. It is suitable for applications with medium to low stiffness and large deformation, such as the progressive braking of elevator safety clamps.
[0013] As an improvement, the safety clamp body is provided with a first positioning block and a second positioning block. The first positioning block is located at the top of the ball guide block, and the second positioning block is located at the bottom of the ball guide block. The ball guide block is vertically limited between the first positioning block and the second positioning block, thereby increasing the sliding guidance of the ball guide block.
[0014] 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. This makes the two ends of the plate spring in line contact, providing support for generating elastic force. At the same time, the extension direction of the line contact can limit the lateral movement of the spring leaf to prevent instability, while not affecting the elastic deformation in the main bending direction.
[0015] As an improvement, a gap is provided between the top inner sidewall of the flat spring and the first positioning block, and between the flat spring and the second positioning block, to provide space for the elastic deformation of the flat spring.
[0016] As an improvement, a shim is provided between the ball guide block and the plate spring. The shim has a protruding end and is located in the elongated hole of the cover plate. The shim limits the sliding direction through the elongated hole of the cover plate and can adjust the gap between the ball guide block and the plate spring.
[0017] As an improvement, the outer wall of the middle part of the ball is provided with an annular groove, and the arc-shaped opening of the ball guide block is provided with an arc-shaped limiting block. The arc-shaped limiting block is engaged with the annular groove for axial positioning. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of a progressive safety clamp using a ball bearing structure according to the present invention.
[0019] Figure 2 This is a schematic diagram of the split structure of a progressive safety clamp using a ball bearing structure according to the present invention.
[0020] Figure 3This is a schematic diagram of the internal structure of a progressive safety clamp using a ball bearing structure according to this utility model.
[0021] Figure 4 This is a schematic diagram of the connection between the ball bearing and the flat spring of this utility model.
[0022] Figure 5 for Figure 4 A schematic diagram of the components.
[0023] Figure 6 This is a schematic diagram of the installation of the ball bearings and ball bearing guide blocks.
[0024] The figure shows: 1. Safety clamp body, 2. First mounting end, 3. Second mounting end, 4. Ball bearing, 5. Cover plate, 6. Movable clamp block, 7. Guide pressure plate, 8. Needle roller row, 9. First inclined surface, 10. Second inclined surface, 11. Flat spring, 12. Ball bearing guide block, 13. First positioning block, 14. Second positioning block, 15. First positioning post, 16. Second positioning post, 17. Gasket, 18. Arc-shaped limiting block, 19. Annular groove. Detailed Implementation
[0025] The present invention will be further described below with reference to the accompanying drawings.
[0026] like Figure 1-6 As shown, this utility model discloses a progressive safety clamp with a ball bearing structure, comprising a clamp body 1. One side of the clamp body 1 is a first mounting end 2, and the other side is a second mounting end 3. A channel for installing elevator guide rails is formed between the first mounting end 2 and the second mounting end 3. The first mounting end 2 is equipped with ball bearings 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 via the needle roller array 8.
[0027] The first mounting end 2 is provided with a flat spring 11, which is connected to the first mounting end 2 and undergoes elastic deformation due to abutment. The ball bearing 4 is provided with a ball bearing guide block 12, and the flat spring 11 pushes the ball bearing 4 toward the elevator guide rail. In the normal state, there is a gap between the ball bearing 4 and the side wall of the elevator guide rail. In the braking state, the ball bearing 4 is in close contact with the side wall of the elevator guide rail and stops.
[0028] like Figure 3As shown, the safety clamp body 1 is provided with a first positioning block 13 and a second positioning block 14. The first positioning block 13 and the second positioning block 14 are part of the safety clamp body 1 and have a cuboid structure. The bottom surface of the first positioning block 13 and the top surface of the second positioning block 14 are parallel planes, allowing the ball guide block 12 to move laterally. The left side of the first positioning block 13 and the second positioning block 14 are located in the same plane, and the right side has an arc-shaped notch for the bolts fixing the cover plate 5 to pass through.
[0029] The first positioning block 13 is located at the top of the ball guide block 12, and the second positioning block 14 is located at the bottom of the ball guide block 12. The ball guide block 12 is vertically limited between the first positioning block 13 and the second positioning block 14. The top and bottom surfaces of the ball guide block 12 are parallel planes. The ball guide block 12 moves linearly along the cavity between the first positioning block 13 and the second positioning block 14, and the direction of movement is perpendicular to the elevator guide rail.
[0030] 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.
[0031] 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, which provides space for the flat spring 11 to deform.
[0032] like Figure 1 As shown, a gasket 17 is provided between the ball guide block 12 and the flat spring 11. The gasket 17 has a protruding end and is located in the elongated hole of the cover plate 5. The elongated hole serves as a guide for the lateral sliding of the gasket 17.
[0033] like Figure 6 As shown, the outer wall of the middle part of the ball 4 is provided with an annular groove 19, and the arc-shaped opening of the ball guide block 12 is provided with an arc-shaped limiting block 18. The arc-shaped limiting block 18 is embedded with the annular groove 19 for axial positioning, so that the ball 4 provides axial positioning when it rotates.
Claims
1. A progressive safety clamp with a ball bearing structure, comprising a safety clamp body (1), wherein one side of the safety 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 ball bearing (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), which is connected to the first mounting end (2) and undergoes elastic deformation due to abutment. The ball (4) is provided with a ball guide block (12), which is connected to the flat spring (11). The flat spring (11) pushes the ball (4) toward the elevator guide rail. In the normal state, the ball (4) is spaced from the side wall of the elevator guide rail. In the braking state, the ball (4) is in close contact with the side wall of the elevator guide rail and stops.
2. The progressive safety clamp with a ball bearing structure 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). The first positioning block (13) is located at the top of the ball guide block (12), and the second positioning block (14) is located at the bottom of the ball guide block (12). The ball guide block (12) is vertically limited between the first positioning block (13) and the second positioning block (14).
3. A progressive safety clamp employing a ball bearing structure 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. A progressive safety clamp employing a ball bearing structure 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. A progressive safety clamp employing a ball bearing structure according to claim 2, characterized in that: A gasket (17) is provided between the ball guide block (12) and the flat spring (11). The gasket (17) has a protruding end and is located in the elongated hole of the cover plate (5).
6. A progressive safety clamp employing a ball bearing structure according to claim 1, characterized in that: The outer wall of the middle part of the ball (4) is provided with an annular groove (19), and the arc-shaped opening of the ball guide block (12) is provided with an arc-shaped limiting block (18). The arc-shaped limiting block (18) is embedded in the annular groove (19) for axial positioning.
7. A progressive safety clamp employing a ball bearing structure according to claim 2, characterized in that: The ball guide block (12) moves linearly along the cavity between the first positioning block (13) and the second positioning block (14), and the direction of movement is perpendicular to the elevator guide rail.