Anti-pinch structure of hydraulic elevator

Abstract

The utility model discloses a kind of anti-pinch structures of hydraulic elevator, mainly related to elevator protection field. Including the multiple anti-pinch rods of being arranged in the bottom of lifting platform, the bottom of lifting platform is equipped with base, the hydraulic assembly of being equipped with in base is driven lifting platform to move up and down, the bottom of lifting platform is equipped with annular groove, the sidewall of annular groove is equipped with multiple vertical guide slots, the sidewall of anti-pinch rod is equipped with the sliding block of being slidably connected with guide slot, the bottom of lifting platform is equipped with multiple limit switches with hydraulic assembly electrical connection, limit switch is located on the sliding path of sliding block, multiple compression springs are equipped between the bottom of anti-pinch rod and lifting platform. The utility model has the beneficial effect that it can solve the situation that the protection of existing hydraulic elevator bottom anti-pinch device is not comprehensive and is prone to jamming, improve the smoothness of anti-pinch rod and the bottom of lifting platform relative sliding, to guarantee the comprehensiveness and smoothness of anti-pinch protection, improve the security of hydraulic elevator use.

Description

Technical Field

[0001] This utility model relates to the field of anti-pinch technology for lifting platforms, specifically an anti-pinch structure for a hydraulic lifting platform. Background Technology

[0002] When using existing hydraulic lifts, the bottom of the lift is in a position that cannot be observed, which can easily cause pinching injuries to objects or people that are placed under the lift. There are various anti-pinch structures in the existing technology, but these structures cannot cover all positions under the lift when in use, and the anti-pinch structures are prone to jamming during operation, resulting in poor anti-pinch effect. Therefore, the safety of hydraulic lifts needs to be further improved. Utility Model Content

[0003] The purpose of this utility model is to provide an anti-pinch structure for a hydraulic lift, which can solve the problems of incomplete protection and easy jamming of the existing anti-pinch devices at the bottom of the hydraulic lift, improve the smoothness of the relative sliding between the anti-pinch rod and the bottom of the lifting platform, thereby ensuring the comprehensiveness and smoothness of the anti-pinch protection and improving the safety of the hydraulic lift.

[0004] To achieve the above objectives, this utility model employs the following technical solution: An anti-pinch structure for a hydraulic lift includes multiple anti-pinch rods disposed at the bottom of a lifting platform. A base is provided below the lifting platform, and a hydraulic assembly for driving the lifting platform to move up and down is provided on the base. An annular groove is provided at the bottom of the lifting platform, and the multiple anti-pinch rods are slidably connected vertically within the annular groove. Multiple vertical guide grooves are provided on the sidewall of the annular groove, and sliders that are slidably connected to the guide grooves are provided on the sidewall of each anti-pinch rod. Multiple limit switches electrically connected to the hydraulic assembly are provided at the bottom of the lifting platform, and the limit switches are located on the sliding path of the sliders. Multiple compression springs are provided between the anti-pinch rods and the bottom of the lifting platform.

[0005] Furthermore, the anti-pinch rod has a U-shaped longitudinal section, the sliders are symmetrically arranged on both sides of the U-shape, and the compression spring is located between the bottom of the inner side of the U-shape and the bottom of the lifting platform.

[0006] Furthermore, the guide grooves are symmetrically arranged on the opposite side walls of the annular groove, the limit switches are located at the top of the guide grooves, and the limit switches in the two guide grooves are distributed at intervals.

[0007] Furthermore, the annular groove is located on the outer side of the base at the projection position of the bottom of the lifting platform.

[0008] Furthermore, the base is provided with multiple limiting posts that work in conjunction with the bottom of the lifting platform.

[0009] Furthermore, the hydraulic assembly includes symmetrically arranged scissor lifts and hydraulic cylinders that drive the scissor lifts. The scissor lifts are rotatably connected between the bottom of the lifting platform and the base. The limit switch is electrically connected to the hydraulic cylinder.

[0010] Furthermore, the limit switch is a travel switch.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The structure of this utility model features an annular groove at the bottom of the lifting platform, with multiple anti-pinch rods slidably connected vertically within the groove. A hydraulic assembly on the base drives the lifting platform up and down. Multiple limit switches at the bottom of the lifting platform, used in conjunction with the anti-pinch rods, are electrically connected to the hydraulic assembly. This structure allows multiple anti-pinch rods to slide vertically within the annular groove at the bottom of the lifting platform. When an object is inserted under the lifting platform, as the platform descends, an anti-pinch rod at a certain position will inevitably contact the object, causing it to slide towards the inside of the annular groove. This causes the anti-pinch rod to contact the limit switch, thereby stopping the hydraulic assembly connected to it. This promptly stops the lifting platform's vertical movement, providing timely anti-pinch protection for objects or personnel. The protection is more comprehensive, providing good anti-pinch protection at various locations under the lifting platform, further ensuring the safety of the hydraulic lifting machine. 2. Multiple guide grooves are provided on the side wall of the annular groove, and a slider that slides in slidably with the guide grooves is provided on the side wall of the anti-pinch rod. The limit switch is located on the sliding path of the slider. Multiple compression springs are provided between the anti-pinch rod and the bottom of the lifting platform. This structure, with the cooperation of the slider and the guide grooves, makes the vertical sliding of the anti-pinch rod relative to the annular groove smoother and more stable, so that the anti-pinch rod will not shake or deviate when it is obstructed, thereby avoiding the anti-pinch rod from jamming. This makes the operation of the anti-pinch function smoother. The compression springs allow the anti-pinch rod to remain in a downward and away from the limit switch when it is not squeezed, thereby avoiding the limit switch from being accidentally touched and further improving the accuracy of the anti-pinch effect. Attached Figure Description

[0012] Appendix Figure 1 This is a three-dimensional structural diagram of the present invention.

[0013] Appendix Figure 2 This is the right view of this utility model.

[0014] Appendix Figure 3 This is an appendix to this utility model. Figure 2 A cross-sectional view along the AA direction.

[0015] Appendix Figure 4 This is an appendix to this utility model. Figure 3 Cross-sectional view along the BB direction.

[0016] Appendix Figure 5 This is an appendix to this utility model. Figure 4 A magnified view of part C in the middle.

[0017] Appendix Figure 6 This is an appendix to this utility model. Figure 3 A cross-sectional view along the DD direction.

[0018] The labels shown in the attached diagram: 1. Lifting platform; 2. Anti-pinch rod; 3. Base; 4. Annular groove; 5. Guide groove; 6. Slider; 7. Limit switch; 8. Compression spring; 9. Limit post; 10. Scissor lift; 11. Hydraulic cylinder. Detailed Implementation

[0019] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined in this application.

[0020] Reference Figure 1 and Figure 2This utility model describes an anti-pinch structure for a hydraulic lift. The main structure includes multiple anti-pinch rods 2 installed at the bottom of a lifting platform 1. The lifting platform 1 is the main component of the lift, and objects or personnel are located on the lifting platform 1. The anti-pinch rods 2 are located at various positions at the bottom of the lifting platform 1, thereby providing anti-pinch protection against obstacles at various positions below the lifting platform 1. A base 3 is provided below the lifting platform 1, and the base 3 is fixed to the ground or in a foundation pit by welding or bolts. The base 3 is equipped with a hydraulic assembly that drives the lifting platform 1 to move up and down. The hydraulic assembly is generally a hydraulic scissor lift structure as used in the prior art, used to drive the lifting platform 1 to move vertically up and down. The bottom of the lifting platform 1 is provided with an annular groove 4, preferably installed at the bottom of the lifting platform 1 by welding or... Two annular plates of different sizes are fixed to the bolt. The annular groove 4 is formed by the area between the two annular plates. Multiple anti-pinch rods 2 are slidably connected vertically in the annular groove 4. The sidewalls of the anti-pinch rods 2 are in sliding contact with the sidewalls of the annular groove 4. Multiple vertical guide grooves 5 are provided on the sidewalls of the annular groove 4. The guide grooves 5 are recessed inward from the sidewalls of the annular groove 4. Sliding blocks 6 are fixed to the sidewalls of the anti-pinch rods 2 by welding or bolts and are slidably connected to the guide grooves 5. The bottom of the lifting platform 1 is provided with multiple limit switches 7 electrically connected to the hydraulic components. The limit switches 7 can be micro switches or limit switches in the prior art. Specifically, the normally open detection switch of model K5-1676DA-01 produced by Hanrong Electronics (Beijing) Co., Ltd. can be used. The hydraulic components are electrically connected to the PLC controller. When the limit switch 7 is triggered, the hydraulic components connected to it stop operating, thus effectively preventing pinching. The limit switch 7 is located on the sliding path of the slider 6. When the lifting platform 1 descends, if there is an obstacle below the lifting platform 1, the anti-pinch rod 2 will first contact the obstacle. As the lifting platform 1 continues to descend, it will squeeze the anti-pinch rod 2, causing it to slide towards the inside of the annular groove 4. This will then drive the slider 6 to slide within the guide groove 5, causing the slider 6 to contact the limit switch 7. Consequently, the hydraulic components electrically connected to the limit switch 7 will stop operating, preventing the lifting platform 1 from continuing to descend and causing pinching. The anti-pinch rod 2 is vertically slidably connected to various positions in the annular groove 4 at the bottom of the lifting platform 1, ensuring that each... The anti-pinch function is effective even when there are obstacles at any position, greatly improving its comprehensiveness. The cooperation between the slider 6 and the guide groove 5 allows the anti-pinch rod 2 to slide smoothly vertically within the annular groove 4, preventing wobbling or tilting, thus ensuring smooth operation and preventing jamming, guaranteeing the accuracy of the anti-pinch effect. Multiple compression springs 8 are installed between the anti-pinch rod 2 and the bottom of the lifting platform 1. Under the action of these springs, the anti-pinch rod 2 remains away from the limit switch 7, preventing accidental activation of the limit switch 7. When the anti-pinch rod 2 is squeezed by an obstacle, the compression springs 8 are compressed, preventing obstruction of contact between the anti-pinch rod 2 and the limit switch 7. After the lifting platform 1 rises and separates the anti-pinch rod 2 from the obstacle...Under the action of the compression spring 8, the anti-pinch rod 2 slides downward to reset, preparing for subsequent anti-pinch protection and further ensuring the accuracy of the anti-pinch function.

[0021] Preferably, the longitudinal section of the anti-pinch rod 2 is U-shaped. The U-shaped structure can greatly reduce its weight and material cost while ensuring the anti-pinch function. The hollow structure has a certain buffer space to avoid squeezing damage to obstacles. The slider 6 is symmetrically fixed to both sides of the U-shape by welding or bolts. The compression spring 8 is located between the bottom of the inner side of the U-shape and the bottom of the lifting platform 1. The U-shaped structure leaves space for the compression spring 8, so that when the anti-pinch rod 2 slides upward, the slider 6 on the side wall can contact the limit switch 7 in time, while not hindering the compression of the compression spring 8. This makes the structure of the anti-pinch rod 2 more reasonable and ensures the accuracy of the anti-pinch function.

[0022] Preferred, refer to Figure 5 and Figure 6 The guide grooves 5 are symmetrically arranged on the opposite side walls of the annular groove 4. This structure allows the sliders 6 on both sides to slide and connect within the guide grooves 5 on both sides, further improving the stability of the vertical sliding movement of the anti-pinch rod 2. The limit switches 7 are fixed to the top of the guide grooves 5 by adhesive or bolts. The limit switches 7 in the guide grooves 5 on both sides are spaced apart. This structure ensures that limit switches 7 are provided on both sides of the anti-pinch rod 2, so that when the anti-pinch rod 2 slides upward, a limit switch 7 at some position on both sides will always be triggered, further improving the accuracy of the anti-pinch function. The spaced arrangement of the limit switches 7 can ensure the accuracy of triggering while reducing the number of limit switches 7.

[0023] Preferred, refer to Figure 4 The annular groove 4 is located outside the projection position of the base 3 on the bottom of the lifting platform 1. This structure ensures that the anti-pinch rod 2 in the bottom annular groove 4 will not contact the base 3 when the lifting platform 1 descends, thus preventing the anti-pinch rod 2 from being accidentally touched by the base 3. This ensures that the anti-pinch rod 2 will not be accidentally touched when the lifting platform 1 descends to a lower position, further guaranteeing the accuracy of the anti-pinch function in actual use.

[0024] Preferred, refer to Figure 3 The base 3 is fixed with multiple limiting posts 9 for use with the bottom of the lifting platform 1 by welding or bolting. The limiting posts 9 can limit the maximum distance of the lifting platform 1 when it descends. When the lifting platform 1 descends to the lowest point, it contacts the multiple limiting posts 9 and uses the multiple limiting posts 9 to support the lifting platform 1, thereby improving the stability of the lifting platform 1 when it is at the lowest point.

[0025] Preferably, the hydraulic assembly includes symmetrically arranged scissor lift rods 10 and hydraulic cylinders 11 that drive the scissor lift rods 10. The scissor lift rods 10 are rotatably connected between the bottom of the lifting platform 1 and the base 3. Specifically, the scissor lift rods 10 include two symmetrically arranged connecting rods, with the middle of the connecting rods hinged by a pin. The two ends of one connecting rod are rotatably connected to the bottom of the lifting platform 1 and the base 3 respectively by a pin. Slide seats are slidably arranged on the bottom of the lifting platform 1 and the base 3. The two ends of the other connecting rod are rotatably connected to the two slide seats respectively. The main body of the hydraulic rod is rotatably connected to the base 3 or one of the connecting rods by a pin. The movable end of the hydraulic rod is rotatably connected to the other connecting rod by a pin. The limit switch 7 is electrically connected to the hydraulic cylinder 11. This structure can drive the scissor lift rods 10 to perform scissor lifting motion when the hydraulic rod extends or retracts, thereby driving the lifting platform 1 to rise and fall vertically, making the lifting drive of the lifting platform 1 more accurate and stable.

[0026] Preferably, the limit switch 7 is a travel switch. Travel switches have higher precision and lower cost, and can accurately control the opening and closing of the hydraulic components electrically connected to them.

[0027] Working Principle: This invention features an annular groove 4 at the bottom of the lifting platform 1. Multiple anti-pinch rods 2 are vertically slidably connected within the annular groove 4. A hydraulic assembly on the base 3 drives the lifting platform 1 up and down. Multiple limit switches 7, used in conjunction with the anti-pinch rods 2, are electrically connected to the hydraulic assembly at the bottom of the lifting platform 1. This structure allows the multiple anti-pinch rods 2 to slide vertically within the annular groove 4 at the bottom of the lifting platform 1. When an object is inserted under the lifting platform 1, as the platform descends, an anti-pinch rod 2 at a certain position will inevitably come into contact with the object, causing it to slide inwards towards the annular groove 4. This forces the anti-pinch rod 2 to contact the limit switch 7, thereby stopping the hydraulic assembly connected to it. This promptly stops the lifting platform 1's vertical movement, providing timely anti-pinch protection for objects or personnel. More comprehensive, providing excellent anti-pinch protection for all positions below the lifting platform 1, further ensuring the safety of the hydraulic lift. Multiple guide grooves 5 are provided on the side wall of the annular groove 4, and a slider 6 slidably connected to the guide grooves 5 is provided on the side wall of the anti-pinch rod 2. The limit switch 7 is located on the sliding path of the slider 6. Multiple compression springs 8 are provided between the anti-pinch rod 2 and the bottom of the lifting platform 1. This structure, with the cooperation of the slider 6 and the guide grooves 5, makes the vertical sliding of the anti-pinch rod 2 relative to the annular groove 4 smoother and more stable, preventing the anti-pinch rod 2 from shaking or shifting when obstructed, thus avoiding jamming and making the anti-pinch function operate more smoothly. The compression springs 8 ensure that the anti-pinch rod 2 remains downward and away from the limit switch 7 when not being squeezed, thus preventing accidental activation of the limit switch 7 and further improving the accuracy of the anti-pinch effect.

Claims

1. An anti-pinch structure for a hydraulic lift, comprising a plurality of anti-pinch rods (2) disposed at the bottom of a lifting platform (1), a base (3) disposed below the lifting platform (1), and a hydraulic assembly for driving the lifting platform (1) to move up and down disposed on the base (3), characterized in that: The bottom of the lifting platform (1) is provided with an annular groove (4), and multiple anti-pinch rods (2) are slidably connected in the annular groove (4) along the vertical direction. Multiple vertical guide grooves (5) are provided on the side wall of the annular groove (4), and sliders (6) that are slidably connected to the guide grooves (5) are provided on the side wall of the anti-pinch rods (2). Multiple limit switches (7) that are electrically connected to the hydraulic components are provided at the bottom of the lifting platform (1). The limit switches (7) are located on the sliding path of the sliders (6). Multiple compression springs (8) are provided between the anti-pinch rods (2) and the bottom of the lifting platform (1).

2. The anti-pinch structure of a hydraulic lift according to claim 1, characterized in that: The anti-pinch rod (2) has a U-shaped longitudinal section, the slider (6) is symmetrically arranged on both sides of the U-shape, and the compression spring (8) is located between the bottom of the inner side of the U-shape and the bottom of the lifting platform (1).

3. The anti-pinch structure of a hydraulic lift according to claim 1, characterized in that: The guide grooves (5) are symmetrically arranged on the opposite side walls of the annular groove (4), and the limit switches (7) are located at the top of the guide grooves (5). The limit switches (7) in the guide grooves (5) on both sides are distributed at intervals.

4. The anti-pinch structure of a hydraulic lift according to claim 1, characterized in that: The annular groove (4) is located on the outside of the projection position of the base (3) at the bottom of the lifting platform (1).

5. The anti-pinch structure of a hydraulic lift according to claim 4, characterized in that: The base (3) is provided with multiple limiting posts (9) that work in conjunction with the bottom of the lifting platform (1).

6. The anti-pinch structure of a hydraulic lift according to claim 1, characterized in that: The hydraulic assembly includes symmetrically arranged scissor lifts (10) and hydraulic cylinders (11) that drive the scissor lifts (10) to move. The scissor lifts (10) are rotatably connected between the bottom of the lifting platform (1) and the base (3). The limit switch (7) is electrically connected to the hydraulic cylinder (11).

7. The anti-pinch structure of a hydraulic lift according to claim 1, characterized in that: The limit switch (7) is a travel switch.

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