Shockproof double wheel

Abstract

The utility model relates to a shockproof double wheel, it includes upper board, still includes support assembly, wheel group and shock absorbing mechanism, the support assembly includes first support and second support, the second support is nested in first support with first support detachable fixed connection, the wheel group includes two with second support rotatory connection's wheel, shock absorbing mechanism sets up in second support back to wheel group one side with second support detachable fixed connection, the utility model has the effect that shock absorbing effect is good, stable durable structure, strong carrying capacity, maintenance convenient.

Description

Technical Field

[0001] This utility model relates to the field of caster technology, and in particular to a shockproof double wheel. Background Technology

[0002] In the fields of industrial equipment, warehousing and logistics, and automated machinery, casters, as core moving components, directly affect the reliability and service life of equipment due to their load-bearing capacity, shock resistance, and ease of maintenance. When medium- and heavy-duty equipment (such as industrial robots, heavy-duty shelving, and large instruments) moves in complex ground environments, casters must be able to withstand high-frequency vibrations and impact loads while also enabling convenient component replacement and maintenance. However, existing casters have significant structural design flaws that make it difficult to meet these requirements.

[0003] Existing medium and heavy-duty casters have three main drawbacks: First, they are inefficient at preventing shocks, relying mainly on the elasticity of the wheel material or a single-stage spring, which is insufficient to handle complex vibrations. Second, they are inconvenient to maintain, as the brackets are mostly welded as a single structure, with the wheel assembly and shock absorption mechanism fixedly connected, requiring complete disassembly for replacement. Third, the connections are unreliable, with the wheel assembly and bracket connected by ordinary bolts, lacking axial positioning and anti-loosening design, and the bearings lack wear-resistant sleeves, making them prone to loosening, wear, and short lifespan. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a shockproof double wheel with good shock absorption effect, stable and durable structure, strong load-bearing capacity and convenient maintenance.

[0005] The above-mentioned utility model objective is achieved through the following technical solution:

[0006] A shock-absorbing dual-wheel design includes an upper plate, a support assembly, a wheel set, and a shock-absorbing mechanism.

[0007] The bracket assembly includes a first bracket and a second bracket, wherein the second bracket is nested within the first bracket and is detachably and fixedly connected to the first bracket.

[0008] The wheel assembly includes two wheels that are rotatably connected to the second bracket;

[0009] The shock absorption mechanism is located on the side of the second bracket facing away from the wheel assembly and is detachably and fixedly connected to the second bracket.

[0010] Through the above technical solutions, the fixed connection between the square plate and the bracket assembly, the nested and detachable first / second bracket structure, and the connection design between the wheel set and the shock absorption mechanism and the second bracket, modular assembly of the casters is achieved, which facilitates quick disassembly and maintenance; the back-to-back layout of the shock absorption mechanism and the wheel set forms an impact buffer path of "wheel set → bracket → shock absorption", which effectively absorbs ground vibration; the detachable connection method is compatible with different types of shock absorption components, improving the product's versatility and adaptability to medium and heavy-duty equipment and scenarios.

[0011] As a further technical solution of this utility model: the first support is an integrally formed U-shaped frame, which is composed of a first horizontal plate and first side plates extending from both sides thereon;

[0012] The second support is a one-piece molded U-shaped frame, consisting of a second horizontal plate and second side plates extending from both sides thereon;

[0013] The first side plate and the second side plate are connected by a cylindrical rod, and limit nuts are installed at both ends of the cylindrical rod.

[0014] Through the above technical solution, the first and second supports adopt an integrated U-shaped frame design. By inserting cylindrical rods and locking with limiting nuts, the integrated structure not only improves the bending and torsional strength of the supports to meet heavy load requirements, but also limits the lateral displacement of the supports through the precise positioning of the cylindrical rods, and prevents components from falling off with the help of limiting nuts. The modular U-shaped frame structure simplifies the processing flow, reduces manufacturing costs, and ensures the stability and reliability of the connection between the two supports.

[0015] As a further technical solution of this utility model: a bearing seat is fixedly connected below the upper plate, and a bearing is embedded inside the bearing seat. The bearing is locked to the first bracket by tightening a nut.

[0016] Through the above technical solution, the bearing is embedded in the bearing housing under the upper plate and is axially locked by tightening the nut, so that the bracket assembly can rotate flexibly relative to the upper plate (while eliminating the axial clearance of the bearing, reducing steering resistance and noise; the sealing design of the bearing housing, combined with the high load-bearing capacity of the bearing (such as the combination of deep groove ball bearing and thrust ball bearing), ensures the stability and long service life of the caster during steering.

[0017] As a further technical solution of this utility model: the shock absorption mechanism includes an elastic rod, a spring sleeved on the outer periphery of the elastic rod, and an elastic sleeve sleeved on the outer periphery of the spring.

[0018] Through the above technical solution, the vibration damping mechanism forms a multi-stage vibration damping system by using a concentric nested design of elastic rods, springs, and elastic sleeves. The elastic rods limit the radial deformation of the springs to avoid instability, while the elastic sleeves protect the springs and reduce wear. The concentric structure ensures that the damping force is transmitted evenly, improving the absorption capacity of the entire frequency band of vibrations on complex road surfaces and reducing equipment bumps.

[0019] As a further technical solution of this utility model: an upper pressure plate is provided between the two first side plates, a lower pressure plate is provided below the elastic sleeve, the elastic rod passes through the upper pressure plate, the second horizontal plate and the lower pressure plate in sequence, and limit nuts are installed at both ends of the elastic rod.

[0020] Through the above technical solution, the upper and lower pressure plates constrain the displacement direction of the shock absorption components to avoid eccentric loading; the elastic rod passes through the upper pressure plate and the second horizontal plate, and works with the lower pressure plate below the elastic sleeve to realize the axial limit and preload adjustment of the shock absorption mechanism (such as by compressing the spring with a nut), adapting to different load requirements.

[0021] As a further technical solution of this utility model: the wheel is an aluminum core polyurethane wheel, the wheel is rotatably connected to the second side plate through a shrink rod bolt, the shrink rod bolt is embedded in the bearing sleeve, and limit nuts are installed at both ends of the shrink rod bolt.

[0022] Through the above technical solutions, the aluminum core polyurethane wheel, combined with the design of the shrinking rod bolt and bearing sleeve, not only provides rigid support through the aluminum core and achieves wear resistance and shock absorption through the polyurethane outer layer, but also uses the bearing sleeve to reduce the direct friction between the wheel set and the bolt, thereby improving the smoothness of rotation; the shrinking rod bolt's diameter reduction design reduces stress concentration, and the limit nuts at both ends prevent it from falling off, ensuring the fatigue strength and installation stability of the wheel set under heavy loads.

[0023] In summary, this utility model has at least one of the following beneficial technical effects:

[0024] 1. This utility model discloses a shockproof double wheel, which achieves modular disassembly and maintenance of casters, multi-level buffering of ground vibration, and universality of equipment connection through the fixed connection of the upper plate and the nested detachable bracket assembly, and the back-to-back layout of the shock absorption mechanism and the second bracket.

[0025] 2. This utility model discloses a shock-absorbing double wheel, which uses an elastic sleeve to suppress spring resonance noise, an elastic rod to provide initial rigid support, and a spring to absorb large-amplitude impacts, thereby achieving adaptive buffering from small vibrations to severe impacts, while extending the life of the shock-absorbing components.

[0026] 3. This utility model discloses a shockproof double wheel, which reduces wheel inertia through an aluminum core, improves wear resistance and quietness through a polyurethane outer layer, and reduces friction loss by combining bearing sleeves, thereby achieving efficient rotation of the wheel set and long-term maintenance-free operation. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a shockproof double-wheel embodiment of the present invention.

[0028] Figure 2 This is a right view of a first embodiment of the shockproof double-wheel design of this utility model.

[0029] Figure 3 This is a cross-sectional view of the shock-absorbing mechanism of a shock-absorbing double-wheel embodiment of the present invention.

[0030] Figure 4 This is a cross-sectional view of a first embodiment of the shockproof double-wheel design of this utility model.

[0031] Reference numerals: 1. Top plate; 2. Support assembly; 21. First support; 211. First horizontal plate; 212. First side plate; 22. Second support; 221. Second horizontal plate; 222. Second side plate; 3. Wheel set; 31. Wheel; 4. Shock absorption mechanism; 41. Elastic rod; 42. Spring; 43. Elastic sleeve; 5. Bearing seat; 6. Bearing; 7. Tightening nut; 8. Upper pressure plate; 9. Lower pressure plate; 10. Retraction bolt. Detailed Implementation

[0032] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0033] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] Example 1:

[0036] Reference Figure 1 and Figure 2 This utility model discloses a shockproof double wheel, which is composed of an upper plate 1, a support assembly 2, a wheel set 3 and a shock absorption mechanism 4. Each module is detachably or rigidly connected to form a functional integration, realizing a complete functional chain of equipment installation, load transmission, vibration buffering and flexible steering.

[0037] The upper plate 1, which serves as the central connection point for the equipment, can be made of steel plate with a thickness of 5-6mm. It is fixed to the bottom of the equipment by welding or M8-M12 bolts. There are four φ8.7mm mounting holes (hole spacing 85×75mm) pre-set below it, which serve as the only connection interface between the casters and the equipment.

[0038] Reference Figure 1 The support assembly 2 is the core load-bearing structure, consisting of an integrally formed first support 21 and second support 22. Both are U-shaped frames with the same opening direction. The second support 22 is nested within the U-shaped groove of the first support 21 to form an adjustable rigid frame. The first support 21 is formed by bending a first horizontal plate 211 and two first side plates 212 on both sides. The second support 22 is correspondingly provided with a second horizontal plate 221 and a second side plate 222. The first side plates 212 and the second side plates 222 are horizontally connected by a φ10-φ12mm cylindrical rod. The two ends of the cylindrical rod are locked with M10-M12 limiting nuts, which not only restricts the lateral displacement of the second support 22, but also allows it to be finely adjusted by 5-10mm along the axial direction of the cylindrical rod to adapt to different vibration damping requirements.

[0039] Reference Figure 2 and Figure 4The wheelset 3 comprises two aluminum-core polyurethane wheels 31, using a combination of 6061 aluminum alloy hubs and 95 ShoreA polyurethane treads. The former provides rigid support, while the latter achieves wear resistance, shock absorption, and low-noise operation. The wheels are rotatably connected to the second side plate 222 via reduced-length bolts 10. The diameter of the reduced-length section in the middle of the bolt is smaller than that of the threaded sections at both ends, such as the reduced-length section of an M10 bolt (φ8mm), and is embedded in a self-lubricating copper alloy bearing sleeve. The outer ring of the sleeve is interference-fitted to the mounting hole of the side plate. The reduced-length section and the sleeve are clearance-fitted to reduce friction. The bolt ends are protected by limit nuts and spring washers to prevent axial detachment. The single wheel has a load-bearing capacity of 175-300KG.

[0040] Reference Figure 3 The shock absorption mechanism 4 is located on the side of the second bracket facing away from the wheel assembly, forming a three-stage composite buffer system: the elastic rod 41 vertically penetrates the bracket assembly 2, with its upper end connected to the upper pressure plate 8 and its lower end passing through the second horizontal plate 221 and limited by the lower pressure plate 9; the spring 42 is sleeved on the outer periphery of the elastic rod to absorb high-frequency vibrations (such as road bumps); the elastic sleeve 43 (made of rubber or polyurethane) is sleeved on the outside of the spring 42 to absorb low-frequency impacts (such as impacts from overpasses). The upper pressure plate is fixed to the top of the first side plate with M8 bolts. During installation, the spring can be pre-compressed by 5-10mm with a nut to form a linkage buffering effect of "spring compression - sleeve deformation", achieving a vibration absorption efficiency of 60%-80% across the entire frequency band.

[0041] In addition, a bearing housing 5 is welded below the upper plate, and a deep groove ball bearing or thrust ball bearing 6 is embedded inside. The inner ring of the bearing 6 is welded to the first horizontal plate 211, and the outer ring is locked to the bearing housing 5 by M35-M40 tightened nuts 7, allowing the bracket assembly 2 to rotate freely 360°, achieving omnidirectional function. The steering resistance torque is ≤5N·m, adapting to the flexible reversing needs in narrow spaces. The entire structure adopts a modular design, allowing vulnerable parts such as wheel sets and shock absorption mechanisms to be disassembled and replaced independently, improving maintenance efficiency by more than 50% compared to traditional casters. At the same time, the synergistic effect of double wheel load distribution, nested bracket rigidity enhancement, and composite shock absorption system significantly improves the caster's load-bearing capacity and adaptability to complex working conditions.

[0042] The working process of this shockproof double wheel:

[0043] The upper plate 1 is fixed to the equipment chassis with four bolts. When the equipment moves, ground vibration is transmitted to the second support 22 through the wheel 31. The second support 22 presses the elastic rod 41 upward, and the spring 42 and elastic sleeve 43 are compressed synchronously to absorb high-frequency bumps such as rough roads and low-frequency impacts such as crossing thresholds. The dual-wheel structure distributes the robot load, with each wheel bearing ≤200kg. The aluminum core polyurethane wheel reduces tread wear. When maintenance is required, only the limit nut needs to be removed to replace the wheel 31 or the shock absorption mechanism 4 independently, without the need to disassemble the wheel 31 as a whole.

[0044] This utility model discloses a load transfer path for a shock-resistant double wheel:

[0045] Static load transfer path when the equipment is stationary or moving at a constant speed: The equipment load is transferred to the support assembly 2 through the bearing seat 5 and bearing 6 below the upper plate 1, and then distributed to the ground by the nested frame of the first support 21 and the second support 22. The load is evenly distributed to the ground by the double wheel group 3, with a single wheel bearing capacity of 175-300KG.

[0046] Vibration load transmission path during equipment movement: Ground vibration triggers the second support 22 to move upward through wheel set 3, compressing the elastic rod 41 and spring 42 of the shock absorption mechanism 4, and the elastic sleeve 43 absorbs the impact energy synchronously; vibration energy is transmitted to the first support 21 through the upper pressure plate 8, and then transmitted to the upper plate 1 through the axial locking structure of bearing seat 5 and bearing 6. During the process, high-frequency vibration is attenuated by the spring, and low-frequency impact is absorbed by the elastic sleeve 43, ultimately achieving a vibration amplitude of ≤0.5mm for the main body of the equipment.

[0047] This utility model can also achieve modular maintenance. When the wheel 31 is worn or the shock-absorbing spring 42 fails, only the corresponding limit nut and connecting bolt need to be removed to replace the wheel set 3 or the shock-absorbing mechanism 4 independently, without having to disassemble the caster as a whole, thus improving maintenance efficiency.

[0048] The implementation principle of this utility model is as follows: the double-support nested rigid frame bears the equipment load and distributes it to the ground through double wheels; the three-stage shock absorption of different frequencies is achieved by using elastic rod 41 + spring 42 + elastic sleeve 43; universal steering is achieved by using bearing seat and bearing; each component is detachably connected, supporting independent maintenance and replacement, and achieving comprehensive performance of high load-bearing capacity, excellent shock absorption and easy maintenance.

[0049] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A shock-absorbing double wheel, comprising an upper plate (1), characterized in that, It also includes a support assembly (2), a wheel set (3), and a shock absorption mechanism (4); The bracket assembly (2) includes a first bracket (21) and a second bracket (22), wherein the second bracket (22) is nested inside the first bracket (21) and is detachably and fixedly connected to it; The wheel assembly (3) includes two wheels (31) that are rotatably connected to the second bracket (22); The shock absorption mechanism (4) is located on the side of the second bracket (22) away from the wheel set (3) and is detachably and fixedly connected to the second bracket (22).

2. The shock-absorbing dual-wheel according to claim 1, characterized in that, The first support (21) is an integrally formed U-shaped frame, consisting of a first horizontal plate (211) and first side plates (212) extending from both sides thereon; The second support (22) is an integrally formed U-shaped frame, consisting of a second horizontal plate (221) and second side plates (222) extending from both sides thereon; The first side plate (212) and the second side plate (222) are connected by a cylindrical rod, and both ends of the cylindrical rod are equipped with limit nuts.

3. The shock-absorbing dual-wheel according to claim 1, characterized in that, A bearing seat (5) is fixedly connected to the lower part of the upper plate (1). A bearing (6) is embedded inside the bearing seat (5). The bearing (6) is locked to the first bracket (21) by tightening the nut (7).

4. The shock-absorbing dual-wheel according to claim 2, characterized in that, The shock absorption mechanism (4) includes an elastic rod (41), a spring (42) sleeved on the outer periphery of the elastic rod (41), and an elastic sleeve (43) sleeved on the outer periphery of the spring (42).

5. The shock-absorbing dual-wheel according to claim 4, characterized in that, An upper pressure plate (8) is provided between the two first side plates (212) above, and a lower pressure plate (9) is provided below the elastic sleeve (43). The elastic rod (41) passes through the upper pressure plate (8), the second horizontal plate (221) and the lower pressure plate (9) in sequence. Limiting nuts are installed at both ends of the elastic rod (41).

6. The shock-absorbing dual-wheel according to claim 2, characterized in that, The wheel is an aluminum core polyurethane wheel. The wheel (31) is rotatably connected to the second side plate (222) through a shrink bolt (10). The shrink bolt (10) is embedded in the bearing sleeve. Limit nuts are installed at both ends of the shrink bolt (10).

Images