Heavy duty polyurethane wheel set

Abstract

The application discloses a heavy-load polyurethane wheel set, which comprises a supporting plate and a fixed frame below the supporting plate, the fixed frame comprises two fixed vertical plates arranged in parallel, a connecting plate is fixed between the two fixed vertical plates, a driving motor is mounted on one side of the connecting plate, and a polyurethane wheel driven by the driving motor is mounted on the other side of the connecting plate; the surface of the supporting plate is provided with a rotatable assembly gear, the surface of the supporting plate is provided with a steering gear matched with the assembly gear, and a steering motor in transmission connection with the steering gear is arranged below the supporting plate; a braking mechanism is arranged above the polyurethane wheel on one side of the connecting plate, a bearing platform is arranged above the supporting plate, and the bearing platform is elastically connected with the supporting plate; the heavy-load polyurethane wheel set has the advantages of high strength, difficulty in collapsing and deforming, power assistance during starting or stopping, good buffering effect during object bearing, and suitability for popularization and use.

Description

Technical Field

[0001] This invention relates to the field of polyurethane wheel technology, and more particularly to a heavy-duty polyurethane wheel set. Background Technology

[0002] Polyurethane wheels are made primarily of polyurethane elastomer, available in two main categories: polyether and polyester. They combine the high elasticity of rubber with the high strength of engineering plastics, and their hardness and special properties can be customized as needed. Molded using casting injection molding or overmolding processes, they can operate stably in a wide temperature range from -40℃ to 80℃. Polyurethane wheels operate based on a dual principle of rolling transmission and elastic deformation buffering. They achieve smooth movement through low-resistance rolling, absorb vibrations and reduce noise through the material's elastic structure, and are not prone to permanent deformation. This product is suitable for a wide range of applications, including logistics warehousing, industrial equipment, medical devices, commercial and residential applications, special working conditions, and intelligent transmission systems.

[0003] Compared to traditional rollers, it has superior wear resistance, strong load-bearing capacity, quiet and stable operation, and can protect various types of surfaces from scratches. It has now become a core component in various industries to replace traditional rollers.

[0004] However, current heavy-duty polyurethane wheels are prone to overall or partial collapse and deformation under prolonged heavy loads, which not only affects walking accuracy but also shortens the lifespan of the wheel set. Furthermore, most existing heavy-duty wheel sets have poor cushioning; when traveling on uneven surfaces or starting and stopping, the impact force is directly transmitted to the load, easily damaging the cargo and the internal structure of the wheel set. Additionally, due to the heavy-duty environment, the wheel set cannot achieve the expected performance in a short time when starting or stopping. To address these problems, this invention proposes a new heavy-duty polyurethane wheel set that effectively solves the aforementioned issues. Summary of the Invention

[0005] The purpose of this invention is to solve the above problems by providing a heavy-duty polyurethane wheel set that is strong, not easily collapsed or deformed, can assist during start-up or shutdown, and can also provide good cushioning when used for carrying loads.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a heavy-duty polyurethane wheel set, comprising a support plate and a fixed frame below the support plate, the fixed frame comprising two parallel fixed upright plates, a connecting plate fixed between the two fixed upright plates, a drive motor mounted on one side of the connecting plate, and a polyurethane wheel driven and connected to the drive motor mounted on the other side of the connecting plate; the surface of the support plate is provided with a rotatable assembly gear, the surface of the support plate is provided with a steering gear adapted to the assembly gear, and a steering motor driven and connected to the steering gear is provided below the support plate; a braking mechanism is provided above the polyurethane wheel on one side of the connecting plate, and a bearing platform is provided above the support plate, the bearing platform being elastically connected to the support plate.

[0007] Preferably, the polyurethane wheel includes an internal iron core and a reinforcing mechanism around the iron core. The reinforcing mechanism includes ribs evenly distributed around the iron core. A fixing ring is provided outside the ribs, and the fixing ring passes through the ribs. A polyurethane layer is cast on the outside of the ribs and the fixing ring.

[0008] Preferably, the cross-section of the rib is semi-circular, wherein the rib is welded to the outer circumference of the iron core.

[0009] Preferably, the braking mechanism includes two symmetrically arranged brake rollers, which are located above the polyurethane wheel and below the support plate. An auxiliary motor is provided on the outer side of the connecting plate, and the auxiliary motor is connected to the brake rollers in a transmission manner.

[0010] Preferably, the brake roller has an elliptical cross-section, and under normal conditions, the outer circumference of the brake roller does not contact the circumference of the polyurethane wheel.

[0011] Preferably, the braking mechanism further includes a movable sliding plate vertically arranged below the support plate, the movable sliding plate being slidably connected to the support plate, an electric push rod being provided on one side of the movable sliding plate, the electric push rod being fixed to the bottom surface of the support plate, a limiting boss being provided on the other side of the movable sliding plate, and an auxiliary motor being provided on the movable sliding plate and drivenly connected to the limiting boss.

[0012] Preferably, the polyurethane wheel has a recessed cavity on the side near the movable slide plate, and the recessed cavity is adapted to the limiting boss.

[0013] Preferably, the assembly gear has an integral connecting shaft at its center, and a flexible floating lifting cylinder is provided above the connecting shaft, the lifting cylinder being fixedly connected to the support platform.

[0014] Preferably, the lifting cylinder is sleeved on the outer circumference of the connecting shaft, and multiple waist holes are provided around the lifting cylinder. Multiple extension rods are provided around the connecting shaft. The extension rods pass through the lifting cylinder at the waist holes and extend outward. A damping rod is fixed to the surface of the extension rod at the extension end. A spring is provided around the damping rod. The surfaces of the damping rod and the spring are connected to the bearing platform.

[0015] Preferably, the surface of the support plate is provided with limiting rods at the four corners, and under normal conditions, the top of the limiting rods does not contact the bearing platform.

[0016] This invention discloses a heavy-duty polyurethane wheel set, which has the following advantages compared with the prior art: 1. The invention improves the overall structural strength of the polyurethane wheel by adding a reinforcing mechanism consisting of ribs and a fixing ring to the outside of the iron core. This makes the polyurethane wheel less prone to deformation and delamination during long-term heavy-duty use, improving the load-bearing capacity and service life of the wheel set and ensuring its stability in heavy-duty scenarios. 2. The invention features a double-layer braking mechanism. In emergency braking, the elliptical brake roller rotates first, causing its long-diameter side to contact and press against the polyurethane wheel. Friction initially decelerates the polyurethane wheel. Subsequently, the moving slide plate is pushed to lock the limiting boss into the cavity on the side of the polyurethane wheel. This double braking ensures braking stability, prevents accidental slippage, and improves safety in heavy-duty scenarios. 3. The bearing platform and support plate use an elastic connection structure. The vibrations generated during transport can be buffered and absorbed by springs and damping rods, preventing the load from shaking due to vibration and further improving the stability of the wheel set during operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a heavy-duty polyurethane wheel assembly according to the present invention.

[0018] Figure 2 This is a schematic diagram of the internal structure of a heavy-duty polyurethane wheel assembly according to the present invention. Figure 1 .

[0019] Figure 3 This is a schematic diagram of the internal structure of a heavy-duty polyurethane wheel assembly according to the present invention. Figure 2 .

[0020] Figure 4 This is a schematic diagram of the internal structure of a heavy-duty polyurethane wheel assembly according to the present invention. Figure 3 .

[0021] Figure 5 This is a schematic diagram of the internal structure of a heavy-duty polyurethane wheel assembly according to the present invention. Figure 4 .

[0022] Figure 6 For the present invention Figure 4Sectional view along the AA direction.

[0023] Figure 7 For the present invention Figure 6 Sectional view along the middle BB direction.

[0024] Figure 8 For the present invention Figure 3 A magnified structural diagram of point A in the middle.

[0025] Figure 9 This is a schematic diagram of the internal structure of the polyurethane wheel in a heavy-duty polyurethane wheel assembly according to the present invention. Figure 1 .

[0026] Figure 10 This is a schematic diagram of the internal structure of the polyurethane wheel in a heavy-duty polyurethane wheel assembly according to the present invention. Figure 2 .

[0027] Figure 11 This is a cross-sectional schematic diagram of a heavy-duty polyurethane wheel assembly according to the present invention.

[0028] In the diagram: 1. Support plate; 11. Moving slide plate; 12. Auxiliary motor one; 13. Electric push rod; 14. Limiting boss; 2. Limiting rod; 3. Polyurethane wheel; 31. Iron core; 32. Rib; 33. Fixing ring; 34. Cavity; 35. Polyurethane layer; 4. Fixed upright plate; 5. Connecting plate; 51. Auxiliary motor two; 52. Brake roller; 6. Drive motor; 7. Steering motor; 71. Steering gear; 8. Assembly gear; 81. Connecting shaft; 82. Extension rod; 83. Spring; 84. Damping rod; 9. Bearing platform; 91. Lifting cylinder; 92. Waist hole. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0030] Please refer to Figure 1-11 A heavy-duty polyurethane wheel set includes a support plate 1 and a fixed frame below the support plate 1. The fixed frame includes two parallel fixed upright plates 4, and a connecting plate 5 is fixed between the two fixed upright plates 4. A drive motor 6 is installed on one side of the connecting plate 5, and a polyurethane wheel 3 driven and connected to the drive motor 6 is installed on the other side of the connecting plate 5. The fixed upright plates 4 and the connecting plate 5 are both made of hard metal, such as steel alloy, to provide stable support for the polyurethane wheel 3 below, so as to meet the requirements of heavy-duty use.

[0031] When in use, the drive motor 6 drives the polyurethane wheel 3 to rotate, enabling movement under heavy loads and increasing overall load-bearing capacity. The surface of the support plate 1 is provided with a rotatable assembly gear 8 (the assembly gear 8 rotates based on the support plate 1 and its top is fixed to the bearing platform 9), the surface of the support plate 1 is provided with a steering gear 71 adapted to the assembly gear 8, and a steering motor 7 that is connected to the steering gear 71 is located below the support plate 1. Since the steering gear 71 is engaged with the assembly gear 8, and the assembly gear 8 can be rotatably connected to the support plate 1, when the steering motor 7 is started and the steering gear 71 rotates, the support plate 1 and the polyurethane wheel 3 below can rotate with the drive, thereby adjusting the driving angle, thus meeting the need for flexible steering in heavy-load scenarios, and the steering process is stable and controllable.

[0032] A braking mechanism is provided on one side of the connecting plate 5 above the polyurethane wheel 3, and a bearing platform is provided above the support plate 1. The bearing platform 9 is elastically connected to the support plate 1. The bearing platform 9 is used to carry heavy-duty goods to be transported. The elastic connection can buffer the impact force during the bearing process, protect the goods and wheel structure from damage, and improve the stability of heavy-duty use.

[0033] Furthermore, the polyurethane wheel 3 includes an internal iron core 31 and a reinforcing mechanism around the iron core 31. The reinforcing mechanism includes ribs 32 evenly distributed around the iron core 31. A fixing ring 33 is provided on the outside of the ribs 32. The fixing ring 33 passes through the ribs 32. A polyurethane layer 34 is cast on the outside of the ribs 32 and the fixing ring 33.

[0034] With this configuration, the iron core 31 can ensure the overall structural strength of the wheel body and meet the load-bearing requirements of heavy-duty use. The reinforcing mechanism formed by the ribs 32 and the fixing ring 22 can increase the bonding area between the polyurethane layer 34 and the internal structure, preventing the polyurethane layer 34 from separating from the iron core 31 during long-term heavy-duty use, thereby improving the overall structural stability of the wheelset and extending its service life.

[0035] Furthermore, the cross-section of the rib 32 is semi-circular, and the rib 32 is welded to the outer circumference of the iron core 1, which makes processing more convenient. Moreover, the semi-circular rib 32 can better fit with the polyurethane layer 34, avoiding stress concentration that could cause the polyurethane layer to crack.

[0036] In this embodiment, the polyurethane wheel 3 is used for heavy loads. When the cargo is heavy, the polyurethane wheel 3 will move a short distance due to inertia, which will increase the stopping position error. The braking mechanism can provide double braking for the polyurethane wheel, improving the accuracy and reliability of braking.

[0037] Specifically, the braking mechanism includes two symmetrically arranged brake rollers 52, which are located above the polyurethane wheel 3 and below the support plate 1. An auxiliary motor 51 is provided on the outer side of the connecting plate 5, and the auxiliary motor 51 is connected to the brake rollers 52 in a transmission manner.

[0038] The brake roller 52 has an elliptical cross-section, and under normal conditions, the outer circumference of the brake roller 52 does not contact the circumference of the polyurethane wheel 3.

[0039] Therefore, when the polyurethane wheel 3 needs to stop running, the auxiliary motor 51 drives the brake roller 52 to rotate. As the brake roller 52 rotates, the side with the larger diameter of the elliptical cross-section brake roller 52 gradually comes into contact with the rotating polyurethane wheel 3, and the polyurethane wheel 3 is initially decelerated by friction. To improve braking reliability, the braking mechanism also includes a vertically mounted movable slide plate 11 below the support plate 1. The movable slide plate 11 is slidably connected to the support plate 1, and the connection method can be a slide rail or other existing structure, which will not be described in detail here. One side of the movable slide plate 11 is provided with an electric push rod 13, which is fixed to the bottom surface of the support plate 1. The other side of the movable slide plate 11 is provided with a limiting boss 14, and the movable slide plate 11 is provided with an auxiliary motor 12 that is drivenly connected to the limiting boss 14.

[0040] In addition, the polyurethane wheel 3 has a recess 34 on the side near the movable slide plate 11, and the recess 34 is adapted to the limiting boss 14.

[0041] During use, after the polyurethane wheel 3 initially decelerates, the electric push rod 13 pushes the moving slide plate 11 to move towards one side of the polyurethane wheel 3, so that the limiting boss 14 is aligned with the cavity 34 on the side of the polyurethane wheel 3. Then the electric push rod 13 stops pushing, and the auxiliary motor 12 drives the limiting boss 14 to extend, so that the limiting boss 14 is engaged in the cavity 34, thereby locking and fixing the polyurethane wheel 3 and completing the final stop. The dual braking structure greatly improves the reliability and accuracy of braking under heavy load conditions and avoids the impact of inertial slippage on use.

[0042] In this embodiment, the auxiliary motor 12, the auxiliary motor 51, and the drive motor 6 are all stepper motors, which facilitates precise control of the operation of each component, adapts to the control requirements of wheel set start-stop and steering, and improves the overall control accuracy.

[0043] Furthermore, the arrangement of the mobile skateboard 11, auxiliary motor 12, boss 14, and cavity 34 not only improves the reliability and accuracy of braking under heavy loads, but also prevents the polyurethane wheels from rolling accidentally when parking on slopes, further enhancing the safety of heavy-load parking and reducing safety hazards.

[0044] During braking, the auxiliary motor 12 rotates in the opposite direction to the polyurethane wheel 3.

[0045] Due to the heavy-duty operating environment, when the vehicle needs to continue driving after stopping, the single drive motor 6 will be under a large load and it will be difficult to maintain stable driving quickly. At this time, the electric push rod 13 pushes the moving slide plate 11 closer to the polyurethane wheel 3, which also causes the limiting boss 14 to insert into the cavity 34. Then, the auxiliary motor 12 is driven so that the direction of the auxiliary motor 12 is consistent with the direction of the polyurethane wheel 3. In this way, the limiting boss 14 can assist in driving the polyurethane wheel 3 to rotate initially, assisting the drive motor 6 to start, reducing the load on the drive motor 6 when starting, enabling the drive motor 6 to start smoothly, and reducing the impact damage to the structure of the drive motor 6 and polyurethane wheel 3 during startup, further extending the overall service life of the wheel set.

[0046] In other words, by driving the limiting boss 14 to rotate slowly through the auxiliary motor 12, it can cooperate with the drive motor 6 to pre-start the polyurethane wheel 3, reduce the starting load of the drive motor 6, avoid excessive current during startup that could burn out the circuit, improve the reliability of startup under heavy load, and protect the drive motor 6 from damage.

[0047] In this embodiment, the drive motor 6, polyurethane wheel 3, limiting boss 14 and auxiliary motor 12 are located on the same axis to ensure coaxiality during the drive transmission process, avoid additional wear caused by transmission misalignment, and improve transmission accuracy.

[0048] Furthermore, the assembly gear 8 has an integral connecting shaft 81 at its shaft center, and a flexible floating lifting cylinder 91 is provided above the connecting shaft 81. The lifting cylinder 91 is fixedly connected to the bearing platform 9.

[0049] The lifting cylinder 91 is sleeved on the outer circumference of the connecting shaft 81. Multiple waist holes 92 are provided around the lifting cylinder 91, and multiple extension rods 82 are provided around the connecting shaft 81. The extension rods 82 pass through the lifting cylinder 91 at the waist holes 92 and extend outwards. A damping rod 84 is fixed to the surface of the extension rod 82 at its extended end. A spring 83 is provided around the damping rod 84. The surfaces of the damping rod 84 and the spring 83 are connected to the bearing platform 9. When the bearing platform 9 is subjected to a heavy impact force, the bearing platform 9 compresses the spring 83 and simultaneously floats downwards relative to the extension rods 82 along the direction of the waist holes 92. The damping rod 84 provides damping buffering, absorbs impact energy, avoids rigid impact damage to the wheel assembly structure, and improves load-bearing stability.

[0050] The surface of the support plate 1 is also provided with limiting rods 2 at the four corners. Under normal conditions, the top of the limiting rods 2 does not contact the bearing platform 9. When the load is too large and the floating amount exceeds the preset range, the limiting rods 2 can limit and support the bearing platform 9 to prevent the spring 83 from being compressed too much and causing plastic deformation, thereby further improving the structural safety.

[0051] In this embodiment, the auxiliary motor 12, the auxiliary motor 2 51, the drive motor 6, the steering motor 7, and the electric push rod 13 are all linked and controlled by a control unit. The control logic can be preset according to actual usage requirements. When steering is required, the control unit drives the steering motor to work, and drives the assembly gear to rotate through the steering gear, thereby adjusting the overall driving direction of the wheel set. The control process is simple and stable.

[0052] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A heavy-duty polyurethane wheel set, characterized in that, The system includes a support plate and a fixed frame below the support plate. The fixed frame includes two parallel fixed uprights, with a connecting plate fixed between the two uprights. A drive motor is mounted on one side of the connecting plate, and a polyurethane wheel connected to the drive motor is mounted on the other side of the connecting plate. The surface of the support plate is provided with a rotatable assembly gear, and the surface of the support plate is provided with a steering gear adapted to the assembly gear. A steering motor connected to the steering gear is located below the support plate. A braking mechanism is provided above the polyurethane wheel on one side of the connecting plate, and a bearing platform is provided above the support plate, with the bearing platform elastically connected to the support plate.

2. The heavy-duty polyurethane wheel set according to claim 1, characterized in that, The polyurethane wheel includes an internal iron core and a reinforcing mechanism around the iron core. The reinforcing mechanism includes ribs evenly distributed around the iron core. A fixing ring is provided on the outside of the ribs, and the fixing ring passes through the ribs. A polyurethane layer is cast on the outside of the ribs and the fixing ring.

3. The heavy-duty polyurethane wheel set according to claim 2, characterized in that, The rib has a semi-circular cross-section, and the rib is welded to the outer circumference of the iron core.

4. The heavy-duty polyurethane wheel set according to any one of claims 1-3, characterized in that, The braking mechanism includes two symmetrically arranged brake rollers, which are located above the polyurethane wheel and below the support plate. An auxiliary motor is provided on the outer side of the connecting plate, and the auxiliary motor is connected to the brake rollers in a transmission manner.

5. The heavy-duty polyurethane wheel set according to claim 4, characterized in that, The brake roller has an elliptical cross-section, and under normal conditions, the outer circumference of the brake roller does not contact the circumference of the polyurethane wheel.

6. The heavy-duty polyurethane wheel set according to claim 4, characterized in that, The braking mechanism also includes a movable sliding plate vertically arranged below the support plate. The movable sliding plate is slidably connected to the support plate. An electric push rod is provided on one side of the movable sliding plate and is fixed to the bottom surface of the support plate. A limiting boss is provided on the other side of the movable sliding plate, and an auxiliary motor is provided on the movable sliding plate that is drivenly connected to the limiting boss.

7. The heavy-duty polyurethane wheel set according to claim 6, characterized in that, The polyurethane wheel has a recessed cavity on the side near the moving slide plate, and the recessed cavity is adapted to the limiting boss.

8. The heavy-duty polyurethane wheel set according to claim 1, characterized in that, The assembly gear has an integral connecting shaft at its center, and a flexible floating lifting cylinder is provided above the connecting shaft. The lifting cylinder is fixedly connected to the support platform.

9. The heavy-duty polyurethane wheel set according to claim 8, characterized in that, The lifting cylinder is sleeved on the outer circumference of the connecting shaft. Multiple waist holes are provided around the lifting cylinder, and multiple extension rods are provided around the connecting shaft. The extension rods pass through the lifting cylinder at the waist holes and extend outward. A damping rod is fixed to the surface of the extension rod at the extension end. A spring is provided around the damping rod. The surfaces of the damping rod and the spring are connected to the bearing platform.

10. The heavy-duty polyurethane wheel set according to claim 9, characterized in that, The surface of the support plate is also provided with limiting rods at the four corners. Under normal circumstances, the top of the limiting rods does not contact the bearing platform.

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