Buffering device of lifting platform

Abstract

The utility model relates to a lifting platform buffering device which comprises a bottom plate, a top plate, an elastic damping part and a supporting unit. The elastic damping part is arranged between the top plate and the bottom plate and can generate telescopic deformation. The supporting unit comprises two connecting rod parts and two sliding block parts which are distributed into two sets, and the two sets of connecting rod parts and the two sets of sliding block parts are arranged on the two sides of the elastic damping part in a left-right opposite mode. Length extension lines of the two connecting rod parts can intersect, the lower ends of the connecting rod parts are pivotally matched with the bottom plate, and the upper ends of the connecting rod parts are pivotally matched with the sliding block parts. The sliding block part is matched with the top plate through a sliding rail structure, the sliding rail structure comprises a guide column, and the guide column is sleeved with a spring. The sliding block part is matched with the guide column, and the spring can stretch out and draw back to deform in the process that the sliding block part slides relative to the guide column. According to the lifting hydraulic cylinder assembly, the buffering condition can be improved when the lifting platform is within the bearing range and the bearing capacity is large, and the energy consumption of the lifting hydraulic cylinder assembly in the process of driving the lifting platform to decelerate is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting devices, in particular to a lifting platform buffer device. Background Art

[0002] A lifting platform generally consists of a base, a pair of clamping arms or a gantry fixed to the base, a lifting hydraulic cylinder assembly mounted on the gantry (which may include a chain mechanism and an associated transmission system for the lifting hydraulic cylinder), and a lifting platform mounted above the base that matches the lifting cylinder assembly. During operation, cargo is placed on the lifting platform, and the lifting cylinder assembly then drives the lifting platform to move vertically, delivering the cargo to the appropriate height. As the lifting platform moves downward and nears the end of its stroke, it needs to be decelerated to reduce the inertial impact it causes on the base plate. In the prior art, columnar springs (or damping cylinders) are often installed on the base plate to create a buffer distance, gradually slowing the platform's downward movement. For lifting platforms with relatively small support areas, a columnar spring (or damping cylinder, the same below) is often placed in the center of the base plate. For lifting platforms with relatively large support areas, columnar springs are often placed at the corners of the base plate corresponding to the lifting platform. Therefore, the main problem with the buffer mechanism arranged below the existing lifting platform is that when the lifting platform falls to the end of its stroke, the lower end surface of the lifting platform contacts the upper end of the column spring. The contact area is small and the impact force is large. After long-term operation, it is easy to cause the lifting platform to deform and sag, which has an adverse effect on the stability of the lifting platform. In addition, the lifting platform with a relatively large supporting area, because it is in contact with the upper ends of multiple column springs, is in a relatively large load-bearing operation condition for a long time. After a long period of operation, it is easy for the deformation degree of each corner position to gradually increase, which causes the lifting platform to shake obviously or tilt or overturn during the buffering deceleration process, resulting in the problem of poor stability of the buffering process, causing safety hazards. Utility Model Content

[0003] The lifting platform buffer device provided by the utility model increases the contact area between the lifting platform and the buffer device, can reduce the impact force on the lifting platform, and can effectively prevent the lifting platform from being excessively deformed under a relatively large load-bearing state for a long time; at the same time, when it is suitable for a lifting platform with a relatively large supporting area, it can also ensure that the lifting platform can maintain a stable deceleration operating state after long-term operation, suppress the occurrence of obvious shaking, tilting, etc., and help reduce repair and maintenance costs.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a lifting platform buffer device, including a bottom plate fixed on the machine base and located below the lifting platform, a top plate arranged between the bottom plate and the lifting platform, an elastic damping part and a supporting unit.

[0005] The upper portion of the elastic damping portion is fixedly connected to the top plate, and the lower portion is fixedly connected to the bottom plate, and can generate telescopic deformation when the top plate moves relative to the bottom plate in a vertical direction.

[0006] The elastic damping unit includes two connecting rods and two sliders, with the connecting rods and sliders arranged in two sets, one for each pair. The two sets of connecting rods and sliders are symmetrically positioned on the left and right sides of the elastic damping unit. The length extensions of the two connecting rods can intersect. The two connecting rods are then arranged relative to each other in a figure-eight configuration, either a straight figure-eight or an inverted figure-eight.

[0007] The lower end of the link portion is pivotally matched with the base plate, and the upper end is pivotally matched with the slider portion, so that the link portion can rotate clockwise and counterclockwise in a vertical plane.

[0008] The slider portion and the top plate are matched by a slide rail structure, allowing the slider portion to slide left and right relative to the top plate. The slide rail structure provided on the top plate and matching the slider portion includes a guide post, and a spring is mounted on the guide post. The slider body of the slider portion matches the guide post, and the spring can expand and contract as the slider body slides relative to the guide post.

[0009] Optionally, the elastic damping part is a damping cylinder or a cylindrical spring.

[0010] When the elastic damping part is a cylindrical spring, a first protrusion is provided on the upper end surface of the bottom plate and a second protrusion is provided on the lower end surface of the top plate. The two ends of the cylindrical spring are respectively plug-connected with the first and second protrusions.

[0011] Optionally, two pairs of vertical arms are fixedly mounted on the lower end surface of the top plate, and are arranged in a left-right opposed relationship. Two horizontal arms are fixedly mounted between the two pairs of vertical arms, spaced apart in a front-to-back manner. The guide posts are correspondingly mounted between the two horizontal arms, with their ends fixed to the two pairs of vertical arms. The horizontal arms are formed with elongated slots extending in the left-right direction.

[0012] Edge plates extending in the front-to-back direction are formed on the front and rear end surfaces of the slider body. The slider body is arranged between two opposing front and rear cross arms, and the edge plates at the front and rear ends respectively pass through the long slots on the two cross arms and are detachably fixed with end plates.

[0013] The upper portion of the end plate is formed with a raised rail extending in the front-to-back direction, and the lower portion is formed with an edge arm extending downward. The upper end of the connecting rod portion is pivotally mated with the edge arm. The cross arm is formed with a grooved track structure corresponding to the raised rail, allowing the slider portion to be suspended from the cross arm and slide in the left-right direction relative to the cross arm.

[0014] Optionally, the upper end surface of the end plate is formed as an upwardly arched surface, which can be in tangential contact with the lower end surface of the top plate.

[0015] Optionally, an elastic pad is fixedly provided on the upper end surface of the top plate and is made to protrude upward relative to the upper end surface of the top plate.

[0016] The beneficial effects of the present invention are as follows: the present invention increases the contact area between the lifting platform and the buffer device, can reduce the impact force on the lifting platform, and can effectively prevent the lifting platform from being excessively deformed under a relatively large load-bearing state for a long time; at the same time, when it is suitable for a lifting platform with a relatively large supporting area, it can also ensure that the lifting platform can maintain a stable deceleration operating state after long-term operation, prevent obvious shaking, tilting, etc., and help reduce repair and maintenance costs.

[0017] Therefore, the present invention significantly improves the cushioning performance of the lift platform when operating within its load-bearing range and under heavy loads. This reduces the impact intensity generated when the lift platform contacts the cushioning device. It also ensures that the lift platform remains stable and horizontal during deceleration, making it less prone to tilting. Furthermore, it helps reduce energy consumption by the lift hydraulic cylinder assembly during deceleration. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the first embodiment of the present invention.

[0019] Figure 2 This is a structural diagram of the second embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the slider (after removing the end plate on the front end side).

[0021] In the figure: 100 lifting platform; 10 bottom plate, 11 boss one; 20 top plate, 21 vertical arm, 22 horizontal arm, 23 guide column, 24 spring, 25 boss two, 26 elastic pad; 30 elastic damping part; 40 supporting unit, 41 connecting rod part, 42 slider part, 421 end plate, 4211 convex rail, 4212 edge arm, 4213 arch surface, 422 slider body. DETAILED DESCRIPTION

[0022] The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for the understanding and reading of those familiar with this technology. They are not used to limit the conditions for the implementation of the utility model and therefore have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in the utility model without affecting the efficacy and purpose of the utility model. At the same time, terms such as "upper", "lower", "front", "back", and "middle" quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the utility model. Changes or adjustments in their relative relationships should also be considered as the scope of the implementation of the utility model without substantially changing the technical content.

[0023] like Figures 1 to 3 The lifting platform buffer device shown includes a bottom plate 10 fixed on a machine base and relatively located below a lifting platform 100 , a top plate 20 correspondingly arranged between the bottom plate 10 and the lifting platform 100 , an elastic damping part 30 and a support unit 40 .

[0024] The lift platform buffer device of the present invention is located relative to the inner side of the clamp arm or gantry equipped with the lifting hydraulic cylinder assembly. This ensures that the lift platform buffer device remains directly below the lift platform 100 during the ascent and descent of the lift platform 100 by the lifting hydraulic cylinder assembly, ensuring a large and sufficient contact area between the lower end surface of the lift platform 100 and the upper end surface of the top plate 20.

[0025] The elastic damping portion 30 is fixedly connected to the top plate 20 at its upper portion and to the bottom plate 10 at its lower portion. It is capable of undergoing expansion and contraction deformation during vertical movement of the top plate 20 relative to the bottom plate 10. The elastic damping portion 30 can be a damping cylinder or a cylindrical spring. If a cylindrical spring is used, a first boss 11 can be provided on the bottom plate 10, while a second boss 25 can be provided on the lower end surface of the top plate 20. The ends of the cylindrical spring are respectively fitted over the first boss 11 and the second boss 25.

[0026] The elastic damping part 30 can support the top plate 20 to form a vertical distance relative to the bottom plate 10. When the elastic damping part 30 is deformed by expansion and contraction, the vertical distance between the top plate 20 and the bottom plate 10 can be increased or decreased synchronously.

[0027] The elastic damping part 30 includes two connecting rods 41 and two sliding blocks 42, and the two connecting rods 41 and the two sliding blocks 42 are matched one by one to form two sets of connecting rods 41 and sliding blocks 42. The two sets of connecting rods 41 and sliding blocks 42 are symmetrically arranged on the left and right sides of the elastic damping part 30. The length extension lines of the two connecting rods 41 on both sides can extend upward and intersect or extend downward and intersect. In this way, the two connecting rods 41 can be arranged relative to each other in an eight-shaped distribution state, or as Figure 1 The correct eight-character arrangement shown, or Figure 2 Therefore, the main difference between the two embodiments lies in the difference in the relative arrangement of the two connecting rod portions 41 on the left and right sides.

[0028] The lower end of the connecting rod 41 is pivotally coupled to the bottom plate 10, and the upper end is pivotally coupled to the slider 42, allowing the connecting rod 41 to rotate in a vertical plane. The slider 42 is coupled to the top plate 20 via a slide rail structure, allowing the slider 42 to slide left and right relative to the top plate 20.

[0029] The slide rail structure provided on the top plate 20 and matching the slider portion 42 includes a guide post 23, and a spring 24 is mounted on the guide post 23. The slider body 422 of the slider portion 42 matches the guide post 23, allowing the spring 24 to expand and contract as the slider body 422 slides relative to the guide post 23.

[0030] like Figure 1 As shown, when the lifting platform 100 moves downward and contacts the top plate 20, it pushes the top plate 20 downward, decelerating the movement toward the bottom plate 10. During this movement, the two sliders 42 move relatively close to each other, gradually compressing the springs 24 on both sides. Throughout this process, the compression of the elastic damping portion 30 and the spring 24 absorbs the impact energy, ensuring a relatively gentle contact impact when the lifting platform 100 reaches the end of its travel, and achieving a smooth, buffered deceleration process.

[0031] like Figure 2 As shown, when the lifting platform 100 moves downward and contacts the top plate 20, it pushes the top plate 20 downward, decelerating the movement toward the bottom plate 10. During this movement, the two sliders 42 move away from each other, gradually compressing the left and right springs 24. Throughout this process, the compression of the elastic damping portion 30 and the spring 24 absorbs the impact energy, ensuring a relatively gentle contact impact when the lifting platform 100 reaches the end of its travel, and achieving a smooth, buffered deceleration process.

[0032] Figure 1 In the lifting platform buffer device shown, during the buffering and deceleration process, the support distance between the two connecting rod parts 41 in the support unit 40 will gradually become smaller. Figure 2 In the lifting platform buffer device shown, during the buffering and deceleration process, the support distance between the two connecting rod parts 41 in the support unit 40 will gradually increase. Figure 2 The embodiment shown can achieve a better smooth and buffered deceleration process, that is, Figure 2 The embodiment shown can provide stable support for the base plate 20 and the lifting platform 100 in the width direction. If the lifting platform 100 is provided with a large length (the dimension perpendicular to the drawing), a plurality of lifting platform buffer devices can be distributed alternately along the length direction.

[0033] The lifting platform buffer device involved in the present invention can make the top plate 20 move downward smoothly by providing an elastic damping part 30 and a support unit 40, ensuring that the upper end surface of the top plate 20 can maintain a horizontal state and can stably contact the lifting platform 100, so that the lifting platform 100 can maintain a good levelness during the descent and deceleration process, is not prone to deflection, and the smoothness of the descent and deceleration process is improved; at the same time, because the top plate 20 and the lifting platform have a large contact surface, and the kinetic energy of the descent of the lifting platform 100 can be absorbed in multiple directions and fully attenuated, the impact force borne by the lifting platform 100 can be reduced, and the occurrence of large deformation of the lifting platform 100 during the deceleration process can be effectively suppressed. Therefore, the present invention can be well applied to lifting platforms 100 with relatively large supporting areas, and can ensure that the lifting platform 100 can still maintain a stable buffered deceleration operation state after long-term operation, which helps to reduce repair and maintenance costs.

[0034] like Figures 1 to 3 As shown, two pairs of vertical arms 21 are fixedly mounted on the lower end surface of the top plate 20, and the two pairs of vertical arms 21 are arranged symmetrically. Two horizontal arms 22 are fixedly mounted between the two pairs of vertical arms 21, and are spaced apart from each other. The guide posts 23 are correspondingly mounted between the two opposing horizontal arms 22, and the ends of the guide posts 23 are respectively fixed to the two pairs of vertical arms 21.

[0035] The cross arms 22 are formed with long slots extending in the left-right direction. The long slots formed on the two paired cross arms 22 face each other front to back. The length of the long slots is sufficient to accommodate the required left-right sliding travel of the slider 42 relative to the top plate 20 without causing interference.

[0036] Edge plates extending in the front-to-back direction are respectively formed on the front and rear end surfaces of the slider body 422. Figure 3In the scheme shown, two edge plates are provided on the front and rear ends of the slider body 422 (the two rows of threaded holes in the figure correspond to the positions of the two edge plates). After the slider body 422 is provided between the two front and rear opposing cross arms 22, the edge plates on the front and rear ends of the slider body 422 can respectively pass through the long slot holes on the two paired cross arms 22. End plates 421 are respectively fixed on the front and rear ends of the slider body 422 in a detachable manner, and the two end plates 421 are respectively connected to the edge plates on the front and rear ends of the slider body 422. Figure 3 As shown, the upper portion of the end plate 421 corresponds to the front end face or the rear end face of the edge plate and is fixed to the front end face or the rear end face of the edge plate by bolts. The bolts correspond to the two rows of threaded holes distributed on the front end face or the rear end face of the edge plate. The guide column 23 passes through the through hole provided on the slider body 422, as shown in FIG. Figure 3 The through hole is arranged between two rows of threaded holes alternately located above and below.

[0037] The upper portion of the end plate 421 is formed with a raised rail 4211 extending in the front-to-back direction, and the lower portion is formed with a downwardly extending edge arm 4212. The upper end of the connecting rod portion 41 extends between two opposing edge arms 4212 and pivotally mates with the two edge arms 4212. Straight grooves are formed on the left and right ends of the slider body 422. Correspondingly, ridges are formed on the end surface of the end plate 421 facing the slider body 422. The ridges on the end plate 421 can pass through the elongated through-holes in the cross arm 22 and plug into the straight grooves on the slider body 422.

[0038] A groove rail structure corresponding to the convex rail 4211 is formed on the cross arm 22, so that the slider portion 42 can be suspended on the two cross arms 22 facing each other and can slide relative to the cross arms 22 in the left and right directions.

[0039] The upper end surface of the end plate 421 is formed as an upwardly arched arch surface 4213. The arch surface 4213 can be in tangential contact with the lower end surface of the top plate 20.

[0040] An elastic pad 26 is fixedly provided on the upper end surface of the top plate 20 and is made to protrude upward relative to the upper end surface of the top plate 20. During the downward movement of the lifting platform 100, it will first contact the elastic pad 26 to form a primary buffer; then the top plate 20 is pushed downward to cause the elastic damping part 30 and the spring 24 driven by the support unit 40 to be gradually compressed to form a secondary buffer. The above embodiment only illustrates the principle and efficacy of the present invention and is not intended to limit the present invention. There are many aspects of the present invention that can be improved without violating the overall idea. People familiar with this technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A lifting platform buffer device, characterized in that: It includes a bottom plate fixed on the machine base and located below the lifting platform, a top plate arranged between the bottom plate and the lifting platform, an elastic damping part and a supporting unit; The upper portion of the elastic damping part is fixedly connected to the top plate, and the lower portion is fixedly connected to the bottom plate, and can produce telescopic deformation when the top plate moves relative to the bottom plate in the vertical direction; The support unit includes two connecting rods and two sliding blocks, with the connecting rods and the sliding blocks corresponding to each other in two groups. The two groups of connecting rods and the sliding blocks are arranged on both sides of the elastic damping portion in a left-right opposite relationship. The length extension lines of the two connecting rods can intersect, and the lower ends of the connecting rods are pivotally matched with the base plate, and the upper ends are pivotally matched with the sliding blocks, so that the connecting rods can rotate in a vertical plane. The slider part and the top plate are matched through a slide rail structure, so that the slider part can slide in the left and right directions relative to the top plate, and the slide rail structure includes a guide column; a spring is mounted on the guide column; the slider body of the slider part is matched with the guide column, so that the spring can produce telescopic deformation during the sliding process of the slider body relative to the guide column.

2. The lifting platform buffer device according to claim 1, characterized in that: The elastic damping part is a damping cylinder or a cylindrical spring.

3. The lifting platform buffer device according to claim 2, characterized in that: The elastic damping part is a cylindrical spring, and a convex column 1 is provided on the upper end surface of the bottom plate, and a convex column 2 is provided on the lower end surface of the top plate; the two ends of the cylindrical spring are respectively plug-connected with the convex column 1 and the convex column 2.

4. The lifting platform buffer device according to claim 1, characterized in that: Two pairs of vertical arms are fixedly provided on the lower end surface of the top plate, and the two pairs of vertical arms are arranged opposite to each other on the left and right sides; two horizontal arms are fixedly provided between the two pairs of vertical arms, and are arranged alternately in front and back directions; the guide column is correspondingly provided between the two horizontal arms, and its two ends are respectively fixed to the two pairs of vertical arms; a long slot through hole extending in the left-right direction is formed on the horizontal arm; Edge plates extending in the front-to-back direction are respectively formed on the front and rear end surfaces of the slider body; after the slider body is arranged between the two front and rear opposite transverse arms, the two front and rear opposite edge plates can respectively pass through the long slot through holes on the two paired transverse arms and are respectively fixed with end plates in a detachable manner; A convex rail extending in the front-to-back direction is formed on the upper part of the end plate, and an edge arm extending downward is formed on the lower part; the upper end of the connecting rod part is pivotally matched with the edge arm; a groove rail structure corresponding to the convex rail is formed on the cross arm, so that the slider part can be suspended on the cross arm and can slide in the left and right directions relative to the cross arm.

5. The lifting platform buffer device according to claim 4, characterized in that: The upper end surface of the end plate is formed as an upwardly arched arch surface, and the arch surface can be in tangential contact with the lower end surface of the top plate.

6. The lifting platform buffer device according to any one of claims 1 to 5, characterized in that: An elastic pad is fixedly provided on the upper end surface of the top plate and is made to protrude upward relative to the upper end surface of the top plate.

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