A buffer device for a lifting structure

Abstract

The utility model relates to the technical field of lift buffering, and disclose a kind of buffering device of lift structure, between the fixed plate of lift equipment and lift plate, including at least one lift buffering unit;The lift buffering unit includes: fixed sleeve, fixedly installed on the fixed plate;Guide pillar, with the inner hole sliding fit of the fixed sleeve, its upper end is equipped with descent limiting piece, and its lower end is connected with the lift plate;Rise buffering ring, setting in the bottom of the fixed sleeve inner hole;Descent buffering ring, setting in the top of the fixed sleeve inner hole;Wherein, annular limiting boss is equipped on the guide pillar.The utility model is through setting rise buffering ring and descent buffering ring in both ends of stroke, the rigid collision of lift terminal point is converted into the compression of elastomer, impact energy is effectively absorbed, smooth, soft brake is realized, impact force and noise are significantly reduced, and equipment structure is protected.

Description

Technical Field

[0001] This utility model relates to the field of lifting and buffering technology, specifically a buffer device with a lifting structure. Background Technology

[0002] Vertical lifting structures are widely used in industrial equipment, such as vertical lifting unloaders and elevators. The lifting parts of these devices need to operate smoothly and precisely, and effectively buffer at the end of their stroke to reduce impact, noise, and equipment wear.

[0003] Currently, most common lifting guides and buffers use a simple sliding sleeve and guide post combination structure, which has obvious defects: First, its buffering effect is poor. The lifting platform often collides rigidly with the mechanical limit at the end of its stroke, generating huge impact force and noise, which affects the life and stability of the equipment. Secondly, insufficient guiding accuracy makes the single-point supported guide column prone to skewness and jamming, resulting in unstable lifting and accelerating the wear of the guiding elements.

[0004] Therefore, there is an urgent need for a lifting and buffering device that can provide effective cushioning and ensure high-precision guidance. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a buffer device for a lifting structure. This device can achieve smooth guidance during the lifting process and provide flexible and effective buffering at both ends of the stroke to improve the reliability, stability and service life of the equipment.

[0006] This utility model proposes a buffer device for a lifting structure, disposed between a fixed plate and a lifting plate of a lifting device, including at least one lifting buffer unit; the lifting buffer unit includes: a fixed sleeve, fixedly installed on the fixed plate; a guide post, slidably engaged with the inner hole of the fixed sleeve, having a lowering limiting member at its upper end and its lower end connected to the lifting plate; an upward buffer ring disposed at the bottom of the inner hole of the fixed sleeve; and a downward buffer ring disposed at the top of the inner hole of the fixed sleeve; wherein, the guide post has an annular limiting boss; when the guide post rises with the lifting plate to the highest position, the annular limiting boss compresses the upward buffer ring; when the guide post descends to the lowest position, the lowering limiting member compresses the downward buffer ring; Addressing the issues of "high impact from rigid collisions and low guiding accuracy" in traditional lifting buffers, this device achieves flexible buffering and precise guidance through "double buffer rings + guide column limiting". The fixed sleeve provides a sliding base for the guide column, which rises and falls synchronously with the lifting plate. When it rises to the highest position, the annular limiting boss compresses the rising buffer ring; when it falls to the lowest position, the falling limiting component compresses the falling buffer ring, converting rigid collisions into elastic compression, absorbing impact energy, and reducing noise and equipment wear. The double buffer rings form two-point support within the sleeve, ensuring that the guide column and sleeve are coaxial and preventing the guide column from tilting and jamming. It is suitable for industrial equipment such as vertical lifting unloaders and elevators, solving the pain points of poor stability and short lifespan of traditional devices and improving the reliability of the lifting process.

[0007] As a further optimization of this utility model, the inner wall of the fixed sleeve is embedded or entirely made of a high-molecular wear-resistant material. High-molecular wear-resistant materials, such as ultra-high molecular weight polyethylene, have a low coefficient of friction and strong wear resistance, which can reduce the sliding friction between the guide post and the inner wall of the sleeve, reduce the wear rate, and extend the service life of the components. At the same time, the material has good self-lubricating properties, ensuring smooth lifting and lowering of the guide post without jamming, and is suitable for long-term high-frequency lifting operations. The inner wall is embedded or entirely made of this material, which can be selected according to the equipment cost and working conditions, taking into account both economy and practicality, and avoiding the problems of easy corrosion and high friction of traditional metal sleeves.

[0008] As a further optimization of this utility model, the lowering limiting component is annular, and its inner hole is connected to the upper end of the guide post by a thread, which facilitates installation and position adjustment. The height of the limiting component can be precisely adjusted according to the lifting stroke to ensure that the lowering buffer ring can be accurately compressed when it descends to the lowest position. The threaded connection is easy to disassemble, and the limiting component or buffer ring can be quickly replaced during later maintenance to adapt to the stroke requirements of different lifting equipment. At the same time, the annular structure is coaxial with the guide post to avoid eccentric impact during limiting and improve buffer stability.

[0009] As a further optimization of this utility model, a rising limiting member is provided at the lower end of the guide post, located below the annular limiting boss. When the guide post rises to the highest position, the rising limiting member contacts the lower surface of the fixing plate. The rising limit component contacts the fixed plate when the guide column rises to its highest position, forming a double protection. It achieves flexible buffering by compressing the rising buffer ring through the annular limiting boss, and also avoids damage to the buffer ring caused by excessive rise of the guide column. The large contact area between the rising limit component and the fixed plate disperses pressure and avoids local stress concentration, making it suitable for heavy load lifting conditions and ensuring the safe operation of the equipment under extreme conditions. At the same time, it assists in positioning the maximum stroke of the guide column and improves lifting accuracy.

[0010] As a further optimization of this utility model, both the rising buffer ring and the falling buffer ring are made of elastic polymers, such as rubber and polyurethane, which have excellent elastic deformation capabilities. When compressed, they can effectively absorb impact energy and convert it into elastic potential energy, resulting in a significant buffering effect. Compared with metal springs, polymer buffer rings have lower noise, are more impact-resistant, and fit tightly with the guide post, forming a slight seal to prevent dust from entering the sleeve. At the same time, polymer materials are wear-resistant and anti-aging, making them suitable for industrial dusty environments, extending the service life of the buffer rings and avoiding frequent replacements.

[0011] As a further optimization of this utility model, the elastic polymer material is modified polyurethane or nitrile rubber with a Shore hardness between 70° and 90°. Modified polyurethane and nitrile rubber have both elasticity and rigidity within this hardness range. They can absorb impact through deformation to meet cushioning requirements, and provide sufficient support to avoid cushioning failure caused by excessive compression. Both materials are oil-resistant and aging-resistant, making them suitable for complex working conditions of industrial equipment, such as oil stains and high temperatures. Moreover, their hardness is stable, ensuring consistent cushioning effect and solving the contradiction between the easy deformation of traditional soft materials and the poor cushioning of hard materials.

[0012] As a further optimization of this utility model, annular steps are provided at both ends of the opening of the inner hole of the fixed sleeve, and the rising buffer ring and the falling buffer ring are respectively housed in the annular steps; The annular step provides precise installation positioning for the buffer ring, preventing it from shifting within the sleeve, such as due to lifting vibrations. This ensures the buffer ring is always aligned with the guide post limiting structure. The step structure also limits the compression range of the buffer ring, preventing damage from excessive compression. Simultaneously, it forms a sealing groove to help block external dust from entering the sleeve, improving the device's dustproof performance and making it suitable for lifting equipment in dusty industries such as mining and building materials.

[0013] As a further optimization of this utility model, the device also includes an auxiliary guiding mechanism; the auxiliary guiding mechanism includes: multiple auxiliary sleeves, which are evenly distributed around the periphery of the fixed sleeve and fixed to the fixed plate; multiple auxiliary guide rods, whose lower ends are connected to the rising limiting member and whose upper ends slide through the corresponding auxiliary sleeves; The auxiliary guiding mechanism uses a combination of multiple sleeves and guide rods, which are evenly distributed around the periphery of the fixed sleeve to further constrain the horizontal freedom of the guide column, prevent twisting or lateral swaying during the lifting and lowering of the guide column, and improve the overall guiding accuracy. The auxiliary guide rod is connected to the rising limit component and rises and falls synchronously with the guide column. The sliding cooperation is smooth and without jamming, which is suitable for large span and high load lifting conditions. It solves the problem of easy deflection when guiding with a single guide column and ensures that the lifting plate always moves horizontally.

[0014] As a further optimization of this utility model, the upper end of the auxiliary guide rod is provided with a limiting ring, which can prevent the auxiliary guide rod from slipping out of the auxiliary sleeve. In case of excessive descent due to malfunction of the lifting mechanism, it forms a safety protection. When the limiting ring contacts the upper end face of the auxiliary sleeve, it can help limit the minimum stroke of the lifting plate and work together with the descent buffer ring to improve the stability of the descent process. At the same time, the limiting ring has a simple structure, low cost, does not affect the sliding of the guide rod, and is suitable for the safety requirements of the auxiliary guide mechanism.

[0015] As a further optimization of this utility model, the number of lifting buffer units is two, and they are symmetrically arranged on both sides of the lifting actuator to form balanced support, avoid the tilting of the lifting plate caused by uneven force on a single buffer unit, improve overall stability, and the symmetrical arrangement makes the impact force during lifting evenly distributed, reduce the wear of a single buffer ring, and extend the life of the device. At the same time, the dual-unit design provides redundancy, so even if one unit fails, the other can still provide temporary support, improve the reliability of equipment operation, and meet the safety requirements of critical lifting equipment.

[0016] The buffer device with lifting structure proposed in this utility model has the following beneficial effects: (i) By setting up rising and falling buffer rings at both ends of the stroke, the rigid collision at the end of the lifting and lowering is transformed into compression of the elastic body, effectively absorbing the impact energy, achieving smooth and gentle braking, significantly reducing impact force and noise, and protecting the equipment structure. (ii) The rising buffer ring and the falling buffer ring form a two-point support structure for the guide post inside the fixed sleeve, which ensures that the guide post remains highly coaxial with the axis of the fixed sleeve throughout the entire stroke, effectively preventing the guide post from tilting and wearing unevenly, and greatly improving the smoothness of movement and the service life of the components. (iii) The inner wall of the fixed sleeve is made of high polymer wear-resistant material with low friction coefficient and good wear resistance. The buffer ring and the guide post are made of micro gap or micro interference fit, which forms a basic sealing barrier, which can effectively prevent external dust and impurities from entering the sliding pair and extend the service life of the device. (iv) The lowering limit component adopts a threaded connection, which is convenient for installation and position adjustment. The auxiliary guide mechanism further enhances the stability of the lifting process and prevents possible torsion. The overall structure is modular and easy to maintain.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the assembly structure of the present invention and the vertical lifting unloader; Figure 2This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model; Figure 3 This is a front view of the lifting buffer unit in Embodiment 2 of this utility model. Figure 4 This is a cross-sectional structural diagram of the fixing sleeve in Embodiment 3 of this utility model; Figure 5 This is a front structural diagram of the lifting buffer unit in Embodiment 4 of this utility model.

[0019] Figure descriptions: 1. Fixed sleeve; 2. Guide post; 3. Fixed plate; 4. Lifting plate; 5. Connecting seat; 6. Rising limit component; 7. Falling limit component; 8. Polymer wear-resistant sleeve; 9. Falling buffer ring; 10. Rising buffer ring; 11. Annular limiting boss; 12. Auxiliary sleeve; 13. Auxiliary guide rod; 14. Limiting ring. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] Example 1 like Figure 1 and Figure 2 As shown, the buffer device of the lifting structure proposed in this utility model is installed on the vertical lifting unloader, including a fixed plate 3 and a lifting plate 4 and a lifting buffer unit located between the two. The fixed plate 3 is fixed to the frame of the vertical lifting unloader, the lifting structure is installed on the fixed plate 3, and the movable end of the lifting structure extends downward and is fixedly connected to the lifting plate 4, thereby driving the lifting plate 4 to lift. There are two lifting buffer units, which are symmetrically distributed on both sides of the lifting structure. Each lifting buffer unit includes a fixed sleeve 1 and a guide post 2. The fixed sleeve 1 is fixedly installed on the upper end face of the fixed plate 3. The guide post 2 is slidably assembled with the inner hole of the fixed sleeve 1. One end of the guide post 2 extends to the top of the fixed sleeve 1, and the other end of the guide post 2 passes through the fixed sleeve 1 and extends to the bottom of the fixed plate 3 and is equipped with a connecting seat 5. The connecting seat 5 is fixedly connected to the lifting plate 4 by bolts. The inner wall of the fixed sleeve 1 is made of a high-molecular wear-resistant material, such as ultra-high molecular weight polyethylene-UHMWPE, polyoxymethylene-POM, etc., or the entire sliding sleeve is made of this material. When the lifting structure drives the lifting plate 4 to rise and fall, the lifting plate 4 drives the guide column 2 to rise and fall synchronously and slide along the inner hole of the fixed sleeve 1, thereby playing a buffering and guiding role and ensuring the stable vertical rise and fall of the lifting plate 4.

[0023] Example 2 It illustrates yet another embodiment of the invention based on Embodiment 1; like Figure 3 As shown, the lower end of the guide post 2 is equipped with a rising limiter 6 located above the connecting seat 5. The rising limiter 6 is annular and its diameter is larger than the inner diameter of the fixed sleeve 1. When the lifting plate 4 drives the guide post 2 to move up to the highest position, the rising limiter 6 contacts the lower surface of the fixed plate 3, which plays a limiting role, avoids the collision between the connecting seat 5 and the fixed plate 3, and plays a collision protection role. In addition, a descending limiter 7 is installed at the upper end of the guide post 2 above the fixed sleeve 1. The descending limiter 7 is annular and its diameter is larger than the inner diameter of the fixed sleeve 1. When the lifting plate 4 drives the guide post 2 to move down to the lowest position, the descending limiter 7 contacts the upper end face of the fixed sleeve 1 and plays a limiting role to prevent the guide post 2 from slipping out of the fixed sleeve 1 and improve the overall operational stability. Furthermore, the inner hole of the lowering limit member 7 is a threaded hole, and the upper outer circumference of the guide post 2 is provided with an external thread. The lowering limit member 7 is threadedly connected to the upper end of the guide post 2, which facilitates actual disassembly, assembly and adjustment.

[0024] Example 3 It illustrates yet another embodiment of the present invention based on Embodiment 2; like Figure 4 As shown, the fixing plate 3 has a through mounting hole, the fixing sleeve 1 is placed in the mounting hole, and the outer periphery of the fixing sleeve 1 is fixed to the fixing plate 3 by a plurality of evenly distributed fixing ears, thereby fixing the fixing sleeve 1 to the fixing plate 3. A polymer wear-resistant sleeve 8 is fixedly installed in the inner hole of the fixed sleeve 1. The upper and lower ends of the polymer wear-resistant sleeve 8 are axially spaced from the upper and lower openings of the fixed sleeve 1 to form a buffer groove. A descending buffer ring 9 and a rising buffer ring 10 are installed in the upper and lower buffer grooves respectively. The upper end face of the descending buffer ring 9 is flush with the upper end face of the fixed sleeve 1, and the lower end face of the rising buffer ring 10 is flush with the lower end face of the fixed sleeve 1 and the lower end face of the fixed plate 3. The lower outer periphery of the guide post 2 has an annular limiting boss 11 that presses against the upper end face of the rising limiting member 6, and the diameter of the annular limiting boss 11 is the same as the diameter of the rising buffer ring 10, and the lower end diameter of the falling limiting member 7 is the same as the diameter of the falling buffer ring 9. When the guide post 2 rises to the highest position with the lifting plate 4, the annular limiting boss 11 contacts the rising buffer ring 10 and axially compresses the rising buffer ring 10; when the guide post 2 moves down to the lowest position with the lifting plate 4, the lower end of the descending limiting member 7 contacts the descending buffer ring 9 and axially compresses the descending buffer ring 9. When the descending limiting member 7 contacts the descending buffer ring 9 or the annular limiting boss 11 contacts the rising buffer ring 10, the relationship between the descending limiting member 7 and the descending buffer ring 9, and between the annular limiting boss 11 and the rising buffer ring 10, changes instantly from sliding friction to elastic compression. Under the huge compressive stress, the polymer molecular chains of the buffer ring curl and deform, converting the impact kinetic energy into elastic potential energy and thermal energy, thereby achieving gentle and smooth braking. After the impact ends, the elastic body returns to its original shape, thus achieving lifting and lowering buffering. Moreover, since the descending buffer ring 9 and the ascending buffer ring 10 provide two-point support for the guide post 2, they together form a double-support guide structure, ensuring that the guide post 2 maintains a high degree of coaxiality with the axis of the fixed sleeve 1 throughout the entire stroke, avoiding tilting and uneven wear caused by single-point support of the guide post 2, and greatly improving the smoothness of movement and the service life of the components. Furthermore, both the descending buffer ring 9 and the ascending buffer ring 10 are made of modified polyurethane or nitrile rubber with a Shore hardness between 70° and 90°, and their inner holes are slightly smaller than the diameter of the guide post 2, forming a small gap or a slight interference fit to form a basic seal, which can effectively prevent large external dust and impurities from entering the interior of the fixed sleeve 1 and causing wear on the inner wall.

[0025] Example 4 It illustrates yet another embodiment of the invention based on Embodiment 3; like Figure 5As shown, a plurality of auxiliary sleeves 12 are circumferentially distributed around the periphery of the fixed sleeve 1 on the fixed plate 3, and the auxiliary sleeves 12 extend axially and pass through vertically. The upper end face of the rising limit member 6 is equipped with a plurality of auxiliary guide rods 13 corresponding to the plurality of auxiliary sleeves 12. The upper end of the auxiliary guide rod 13 slides through the auxiliary sleeve 12 and extends to the top of the fixed plate 3 and is equipped with a limit ring 14. When the guide post 2 rises and falls synchronously with the lifting plate 4, the plurality of auxiliary guide rods 13 slide axially along the corresponding auxiliary sleeve 12, playing the role of auxiliary guidance and buffering.

[0026] The working principle of this invention is based on the principles of elastic body compression buffering and multi-point support and guidance, as detailed below: When the lifting plate 4 rises under the action of the driving mechanism, it drives the guide column 2 to slide upward in the fixed sleeve 1. When it approaches the end of the rising stroke, the annular limiting boss 11 on the guide column 2 first contacts the rising buffer ring 10. As the lifting continues, the annular limiting boss 11 begins to compress the rising buffer ring 10. As an elastic body, the molecular chain of the rising buffer ring 10 curls and deforms under pressure, effectively converting the kinetic energy of the lifting mechanism into elastic potential energy and a small amount of heat energy, thereby achieving smooth and gentle deceleration and stopping, and avoiding rigid collisions. Similarly, when the lifting plate 4 descends to the end point, the descending limit member 7 at the upper end of the guide column 2 contacts the descending buffer ring 9 and compresses it. The descending buffer ring 9 also absorbs the downward energy through elastic deformation to achieve buffering. The rising limit member 6 and the descending limit member 7 themselves act as hard limits, providing the final safety guarantee. The rising buffer ring 10 and the falling buffer ring 9 are not only used for buffering, but they are located at the bottom and top of the inner hole of the fixed sleeve 1, respectively, forming two support points for the guide post 2 that passes through it. This two-point support structure greatly improves the movement accuracy of the guide post 2, so that it can maintain good verticality throughout the entire stroke, effectively preventing the guide post from tilting, shaking and uneven wear with the inner wall of the sleeve that may be caused by single-point support. In the additional auxiliary guide mechanism, the cooperation of multiple auxiliary guide rods 13 and auxiliary sleeves 12 further constrains the horizontal degree of freedom of the rising limit member 6 and even the entire lifting buffer unit, preventing possible torsion and lateral swaying, and making the lifting process more stable. The wear-resistant polymer material on the inner wall of the fixed sleeve 1 has an extremely low coefficient of friction and self-lubricating properties, which ensures the smooth sliding of the guide post 2 and reduces wear. The rising buffer ring 10 and the falling buffer ring 9 are fitted with the guide post 2 with a small gap or a slight interference fit. While providing support, they also form a dust barrier, which can effectively prevent most external dust from entering the sliding pair.

[0027] In summary, this utility model, through its ingenious structural design, integrates buffering, guiding, limiting, and dustproof functions into one unit, significantly improving the operational quality and service life of the lifting equipment.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A buffer device for a lifting structure, disposed between a fixed plate (3) and a lifting plate (4) of a lifting device, characterized in that, Includes at least one lifting and lowering buffer unit; The lifting buffer unit includes: A fixed sleeve (1) is fixedly installed on the fixed plate (3); The guide post (2) is slidably fitted with the inner hole of the fixed sleeve (1), and its upper end is provided with a lowering limit member (7), and its lower end is connected to the lifting plate (4); A rising buffer ring (10) is provided at the bottom of the inner hole of the fixed sleeve (1); A descending buffer ring (9) is disposed at the top of the inner hole of the fixed sleeve (1); The guide post (2) is provided with an annular limiting boss (11). When the guide post (2) rises to the highest position with the lifting plate (4), the annular limiting boss (11) compresses the rising buffer ring (10); when the guide post (2) falls to the lowest position, the falling limiting member (7) compresses the falling buffer ring (9).

2. The buffer device with a lifting structure according to claim 1, characterized in that, The inner wall of the fixed sleeve (1) is embedded with or is entirely made of a polymer wear-resistant material.

3. The buffer device with a lifting structure according to claim 1, characterized in that, The descending limiting member (7) is annular, and its inner hole is connected to the upper end of the guide post (2) by a thread.

4. A buffer device with a lifting structure according to claim 1 or 3, characterized in that, The guide post (2) is provided with a rising limiting member (6) at its lower end, below the annular limiting boss (11). When the guide post (2) rises to its highest position, the rising limiting member (6) contacts the lower surface of the fixing plate (3).

5. The buffer device with a lifting structure according to claim 1, characterized in that, Both the rising buffer ring (10) and the falling buffer ring (9) are made of elastic polymer.

6. The buffer device with a lifting structure according to claim 5, characterized in that, The elastic polymer material is modified polyurethane or nitrile rubber, with a Shore hardness between 70° and 90°.

7. The buffer device with a lifting structure according to claim 1, characterized in that, The two ends of the inner hole of the fixed sleeve (1) are provided with annular steps, and the rising buffer ring (10) and the falling buffer ring (9) are respectively housed in the annular steps.

8. A buffer device with a lifting structure according to claim 4, characterized in that, It also includes auxiliary guidance mechanisms; The auxiliary guiding mechanism includes: Multiple auxiliary sleeves (12) are evenly distributed around the periphery of the fixed sleeve (1) and fixed to the fixed plate (3); Multiple auxiliary guide rods (13) have their lower ends connected to the rising limit member (6) and their upper ends sliding through the corresponding auxiliary sleeves (12).

9. A buffer device with a lifting structure according to claim 8, characterized in that, The upper end of the auxiliary guide rod (13) is provided with a limiting ring (14).

10. A buffer device with a lifting structure according to claim 1, characterized in that, The number of lifting buffer units is two, and they are symmetrically arranged on both sides of the lifting actuator.

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