Transportation trolley

Abstract

The utility model provides a transport trolley. The transport trolley comprises a frame and at least two multi-wheel devices. Wherein each multi-wheel device comprises a hub, supporting rods and rollers, the hub is rotatably mounted on the frame, at least three supporting rods extending in the radial direction of the hub are mounted on the hub, all the supporting rods are circumferentially and uniformly distributed around the center of the hub, and the rollers are mounted at the tail ends of the supporting rods. The supporting rods can move in the radial direction of the hub where the supporting rods are located so that the rollers can be close to or away from the center of the hub. In the using process, an operator can control stretching and retracting of the supporting rods to achieve ascending and descending of the trolley frame so as to smoothly cross obstacles of various sizes, and therefore the technical scheme is beneficial for enabling the conveying trolley to adapt to different terrains and obstacles, and the trafficability and flexibility of the conveying trolley in the complex environment are improved.

Description

Technical Field

[0001] This application relates to the technical field of transportation devices, and more particularly, to a transportation trolley. Background Art

[0002] In various production activities, it is often necessary to use a trolley to assist in transporting some heavy objects, such as raw materials, parts, and tool equipment. The trolley has a simple, lightweight, and durable structure, which is convenient for operation and maintenance. It plays a good supplementary role for large transportation equipment, can effectively improve production efficiency and reduce production costs, and plays an irreplaceable role in the production process.

[0003] However, limited by its overall size and wheel size, the trolley is mainly suitable for working on flat roads. When the on-site road conditions are complex, such as there are obstacles like gullies, stairs, and thresholds, the progress of the trolley will be greatly hindered. In these cases, it is usually necessary to lift or raise the trolley to cross the obstacle and then continue to move forward. This method is time-consuming and laborious, and is likely to cause accidental damage to the transported items. Therefore, if there are too many obstacles during transportation, the production efficiency will be greatly reduced. In addition, when the load weight is large or when encountering large obstacles, it may be impossible to lift the trolley by manpower. At this time, tools and equipment such as hoists and lifting codes can only be used to lift the heavy object, and then place it back on the trolley after crossing the obstacle. Due to poor obstacle-crossing ability, the application scenario of the trolley is greatly limited, and the load capacity is difficult to be effectively improved, thus having a certain negative impact on production efficiency. Summary of the Utility Model

[0004] The purpose of the embodiments of this application is to provide a transportation trolley, which can more conveniently cross various obstacles encountered during transportation, and can adaptively adjust the height of the frame according to different obstacles, so that the operator can directly cross the obstacle by pushing and pulling the transportation trolley without lifting the transportation trolley or unloading the load.

[0005] This application provides a transportation trolley, including a frame and at least two multi-wheel devices. Each multi-wheel device includes a hub, a support rod, and a roller. The hub is rotatably installed on the frame. At least three support rods extending radially along the hub are installed on the hub. All the support rods are evenly distributed in a circle around the center of the hub. The end of the support rod is installed with a roller. The support rod can move radially along the hub where it is located, so that the roller can approach or move away from the center of the hub.

[0006] In an implementable solution, a medium groove and at least three cylindrical hydraulic cylinders evenly distributed along the circumference around the hub center are arranged inside the hub. The first end of the medium groove communicates with all the cylindrical hydraulic cylinders, the second end of the medium groove is a medium port for the inflow and outflow of hydraulic medium, and the medium port is arranged at the rotation center position of the hub. The first end of the support rod is located inside the cylindrical hydraulic cylinder and is driven to move hydraulically, and the second end of the support rod extends out of the cylindrical hydraulic cylinder and is connected to the roller, and the moving direction of the support rod is along the radial direction of the hub. The transport trolley further includes a hydraulic supply system fixedly arranged on the vehicle frame, and the hydraulic supply system is rotationally and sealingly communicated with the medium port.

[0007] In an implementable solution, the hydraulic supply system includes a hydraulic pump and a fixedly arranged hydraulic transmission pipe. The hydraulic transmission pipe is a hollow tubular structure with openings at both ends. The hydraulic pump is provided with a pump outlet and a pump inlet for hydraulic medium. The surface of the hydraulic transmission pipe is provided with an inflow port and a return port for hydraulic medium. The pump outlet and the pump inlet of the hydraulic pump are respectively communicated with the inflow port and the return port of the hydraulic transmission pipe. Both ends of the hydraulic transmission pipe are rotationally and sealingly communicated with the medium port of the hub.

[0008] In an implementable solution, the outer diameter at both ends of the hydraulic transmission pipe is narrowed to form end connection parts, and the outer diameter of the end connection parts is dimensionally matched with the inner diameter of the medium port, and the end connection parts extend into the inside of the medium port.

[0009] In an implementable solution, oppositely arranged fixed ear plates are installed on the vehicle frame, and mounting holes are provided on the fixed ear plates. In addition, a limiter is further included. Both ends of the hydraulic transmission pipe are respectively inserted into the mounting holes of the two fixed ear plates, and the limiter is fixedly connected to the vehicle frame and the hydraulic transmission pipe respectively.

[0010] In an implementable solution, a bracket is fixedly arranged on the hydraulic transmission pipe, and the hydraulic pump is fixedly arranged on the bracket.

[0011] In an implementable solution, the transport trolley includes an adapter. One end of the adapter is rotatably connected to the hydraulic transmission pipe, and the other end is fixedly connected to the outer wall at the medium port of the hub. The rotation axis of the adapter is the same as the rotation axis of the hub.

[0012] In an implementable solution, the adapter includes an annular connecting piece, a retaining ring and a bearing. The first end of the annular connecting piece is threadedly connected to the outer wall at the medium port of the hub, the second end is sleeved on the end of the hydraulic transmission pipe, and a bearing is arranged between the second end of the annular connecting piece and the hydraulic transmission pipe in a tight fit manner. The inner side of the retaining ring is threadedly connected to the outer side of the hydraulic transmission pipe. The outer diameter of the retaining ring is larger than the inner diameter of the bearing and the inner diameter of the medium port of the hub, and the retaining ring is located between the bearing and the medium port.

[0013] In an implementable solution, the adapter further includes a stop piece, and the stop piece is sleeved on the outer side of the hydraulic transmission pipe and is located between the retaining ring and the hub.

[0014] Compared with the prior art, the beneficial effects of the present application at least include:

[0015] The present application provides a transport trolley, and a retractable support rod is arranged on the wheel hub. During use, an operator can control the retraction and extension of the support rod to lift and lower the vehicle frame, so as to smoothly cross obstacles of various sizes. This design helps the transport trolley to adapt to different terrains and obstacles, and improves its passability and flexibility in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 FIG. is a perspective schematic diagram of a transport trolley shown according to an embodiment of the present application;

[0018] Figure 2 FIG. is the front view of the transport trolley;

[0019] Figure 3 FIG. is the side view of the transport trolley;

[0020] Figure 4 FIG. is a schematic diagram of a hydraulic pump;

[0021] Figure 5 FIG. is the first partial sectional view of the transport trolley;

[0022] Figure 6 FIG. is the second partial sectional view of the transport trolley.

[0023] In the figures: 1, vehicle frame; 2, multi-wheel device; 3, hydraulic supply system; 4, adapter; 101, fixed ear plate; 102, limiter; 111, limit baffle; 112, limit bolt; 113, fixing bolt; 201, wheel hub; 202, support rod; 203, roller; 211, hydraulic cylinder; 212, medium port; 213, medium tank; 214, wheel hub piston; 221, hydraulic piston; 222, roller bracket; 301, hydraulic pump; 302, hydraulic conduit; 303, bracket; 311, pressure relief valve; 321, incoming flow port; 322, return port; 323, end connection part; 331, pump outlet; 332, pump inlet; 401, annular connecting piece; 402, retaining ring; 403, bearing; 404, stop piece; 405, large nut. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0026] As Figures 1 - 3 shown, the present application provides a transport trolley, which includes a vehicle frame 1 and at least two multi-wheel devices 2. Among them, the vehicle frame 1 is used to carry the load and install other components. Each multi-wheel device 2 includes a hub 201, a support rod 202 and a roller 203. The hub 201 is rotatably installed on the vehicle frame 1. At least three support rods 202 extending radially along the hub 201 are installed on the hub 201. All the support rods 202 are evenly distributed in a circle around the center of the hub 201. The end of the support rod 202 is installed with the roller 203. Among them, the support rod 202 can move radially along the hub 201 where it is located, so that the roller 203 approaches or moves away from the center of the hub 201. The transport trolley can adopt a hydraulic rod, an electric push rod or an electric / manual lead screw module, etc. to realize the function of the support rod 202 moving radially along the hub 201 where it is located. The specific power method and mechanical structure are not limited here.

[0027] When in use, if the road condition is relatively flat, at least two rollers 203 in each multi-wheel device 2 are in contact with the ground and roll freely, and at the same time, the hub 201 and the hydraulic transmission pipe 302 remain relatively stationary. When the transport trolley encounters an obstacle, the roller 203 that is in contact with the ground and close to the obstacle in each multi-wheel device 2 is blocked by the obstacle. At this time, when the transport trolley is continuously pushed or pulled, the hub 201 will rotate around the hydraulic transmission pipe 302, driving all the support rods 202 and the rollers 203 to rotate around the center of the hub 201, so as to climb over the obstacle.

[0028] During use, if encountering a large obstacle such as a staircase, the support rod 202 can be controlled to extend radially outward from the hub 201 where it is located, thereby driving the roller 203 away from the center of the hub 201 to achieve the lifting of the vehicle frame 1. At this time, when pushing and pulling the transport trolley, the hub 201 can rotate around its own central axis, driving the support rod 202 and the roller 203 to flip around the central axis of the hub 201. Since the vehicle frame 1 has been lifted, it can be ensured that the bottom of the vehicle frame 1 is higher than the top of the obstacle during the obstacle-crossing process, so as to smoothly cross the obstacle. If it is not necessary to cross a large obstacle, the support rod 202 can be controlled to extend radially inward from the hub 201 where it is located, driving the roller 203 closer to the center of the hub 201 to achieve the lowering of the vehicle frame 1. Such an operation can make the overall occupied space of the transport trolley smaller, reduce the load on the support rod 202, and extend the service life of the entire transport trolley.

[0029] In summary, the operator can achieve the lifting and lowering of the vehicle frame 1 by controlling the telescoping of the support rod 202. This design helps the transport trolley to adapt to different terrains and obstacles, and improves its passability and flexibility in complex environments.

[0030] In one embodiment, as Figure 5 shown, a medium tank 213 and at least three cylindrical hydraulic cylinders 211 evenly distributed along the circumference around the center of the hub 201 are provided inside the hub 201. The first end of the medium tank 213 is connected to all the cylindrical hydraulic cylinders 211, the second end of the medium tank 213 is a medium port 212 for the inflow and outflow of the hydraulic medium, and the medium port 212 is arranged at the rotation center position of the hub 201. The first end of the support rod 202 is located inside the cylindrical hydraulic cylinder 211 and is driven to move hydraulically. The second end of the support rod 202 extends out of the cylindrical hydraulic cylinder 211 and is connected to the roller 203. The moving direction of the support rod 202 is along the radial direction of the hub 201. As Figure 1 shown, the transport trolley further includes a hydraulic supply system 3, which is fixedly arranged on the vehicle frame 1, and the hydraulic supply system 3 is rotationally and sealingly connected to the medium port 212.

[0031] In one embodiment, as Figure 1 shown, the hydraulic supply system 3 includes a hydraulic pump 301 and a fixedly arranged hydraulic transmission pipe 302. The hydraulic transmission pipe 302 is a hollow tubular structure with openings at both ends. As Figure 2 and Figure 4 shown, the hydraulic pump 301 is provided with a pump outlet 331 and a pump inlet 332 for the hydraulic medium. The surface of the hydraulic transmission pipe 302 is provided with an inflow port 321 and a return port 322 for the hydraulic medium. The pump outlet 331 and the pump inlet 332 of the hydraulic pump 301 are respectively connected to the inflow port 321 and the return port 322 of the hydraulic transmission pipe 302. The two ends of the hydraulic transmission pipe 302 are rotationally and sealingly connected to the medium port 212 of the hub 201.

[0032] In one embodiment, as Figure 5 shown, the outer diameter at both ends of the hydraulic transmission pipe 302 can be narrowed to form a terminal portion 323. The outer diameter of the terminal portion 323 is dimensionally matched with the inner diameter of the medium port 212. The terminal portion 323 extends into the interior of the medium port 212, thereby forming a complete hydraulic medium passage between the hydraulic pump 301 and the hydraulic cylinder 211. In addition, a hub piston 214 can be provided inside the medium port 212. After the terminal portion 323 extends into the medium port 212, the hub piston 214 extends into the interior of the terminal portion 323. One or more sealing rings can be provided on the outer side of the hub piston 214 to prevent leakage of the hydraulic medium.

[0033] In one embodiment, as Figure 2 shown, a bracket 303 can be fixedly provided on the hydraulic transmission pipe 302, and the hydraulic pump 301 can be fixedly provided on the bracket 303. In addition, the bracket 303 can be fixedly provided on the vehicle frame 1, or the hydraulic pump 301 can be directly fixedly provided on the vehicle frame 1 (not shown in the figure), and there is no limitation here.

[0034] As Figure 4 shown, a pressure relief valve 311 can be provided near the pump inlet 332 of the hydraulic pump 301. When encountering a relatively high obstacle and it is necessary to lift the vehicle frame 1, first, the hydraulic pump 301 can be used to pump the hydraulic medium into the hydraulic transmission pipe 302 while keeping the pressure relief valve 311 in the closed state. At this time, the hydraulic medium cannot return to the hydraulic pump 301 through the hydraulic transmission pipe 302. Therefore, the hydraulic medium will be pressed into the hub 201, thereby driving the support rod 202 to extend outward from the hub 201 and driving the roller 203 away from the center of the hub 201 to achieve the lifting of the vehicle frame 1. When there is no need to cross an obstacle or the obstacle is relatively low, the pressure relief valve 311 can be opened. At this time, under the action of gravity, the support rod 202 will extend into the hub 201, the volume of the hydraulic cylinder 211 becomes smaller, pushing the hydraulic medium to return from the hub 201 to the hydraulic pump 301 through the hydraulic transmission pipe 302, and at the same time driving the roller 203 to approach the center of the hub 201 to achieve the lowering of the vehicle frame 1.

[0035] Optionally, a detachable pressurizing handle can be provided for the hydraulic pump 301 to do work on the hydraulic pump 301 to drive the hydraulic medium, and a placement position for storing the pressurizing handle (not shown in the figure) can also be provided on the vehicle frame 1 so as to be able to take out the handle for pressurization at any time when encountering various unexpected road conditions, and store the handle after pressurization to reduce space occupation, thereby improving the adaptability and reliability of the transport trolley. In addition, a motor drive method can also be used to complete the pressurization operation of the hydraulic pump 301, and there is no limitation here.

[0036] As Figure 5As shown, a hydraulic piston 221 can be fixedly arranged at the first end of the support rod 202 to better transmit hydraulic pressure and achieve better buffering and sealing effects. In addition, a roller bracket 222 can be fixedly arranged at the second end of the support rod 202. A roller shaft is arranged at one end of the roller bracket 222 away from the support rod 202. The axial direction of the roller shaft is parallel to the axial direction of the hydraulic transmission pipe 302. The roller 203 is sleeved on the roller shaft and can rotate freely around the roller shaft. The roller bracket 222 can form an enclosing effect on the outside of the roller 203, thereby playing a certain protective role for the roller 203.

[0037] In one embodiment, as Figure 1 shown, fixed ear plates 101 arranged oppositely are installed on the vehicle frame 1, and mounting holes are arranged on the fixed ear plates 101. As Figure 6 shown, the transport trolley further includes a stopper 102. Two ends of the hydraulic transmission pipe 302 are respectively inserted into the mounting holes of the two fixed ear plates 101, and the stopper 102 is fixedly connected to the vehicle frame 1 and the hydraulic transmission pipe 302 respectively.

[0038] As Figure 6 shown, the stopper 102 may include a limit baffle 111, a limit bolt 112, and a fixing bolt 113. A hole structure is arranged at the center of the limit baffle 111 and is sleeved on the outside of the hydraulic transmission pipe 302, and the limit baffle 111 can be fixedly connected to the vehicle frame 1 through the fixing bolt 113. Two ends of the limit bolt 112 are respectively threadedly connected to the stopper 102 and the pipe wall of the hydraulic transmission pipe 302, preventing the hydraulic transmission pipe 302 from rotating around its own axis or slipping along its own axis, thereby realizing the fixed connection between the hydraulic transmission pipe 302 and the vehicle frame 1. Since there is an exchange of hydraulic medium between the hydraulic transmission pipe 302 and the hydraulic pump 301, it is necessary to fix and limit the hydraulic transmission pipe 302 to ensure the stable connection between the hydraulic transmission pipe 302 and the hydraulic pump 301.

[0039] In one embodiment, as Figure 5 shown, the transport trolley includes an adapter 4. One end of the adapter 4 is rotatably connected to the hydraulic transmission pipe 302, and the other end is fixedly connected to the outer wall at the medium port 212 of the hub 201. The rotation axis of the adapter 4 is the same as the rotation axis of the hub 201. The adapter 4 includes an annular connector 401, a retaining ring 402, and a bearing 403. The first end of the annular connector 401 is threadedly connected to the outer wall at the medium port 212 of the hub 201, the second end is sleeved on the end of the hydraulic transmission pipe 302, and a bearing 403 is arranged between the second end of the annular connector 401 and the hydraulic transmission pipe 302 in a tight fit manner. The inner side of the retaining ring 402 is threadedly connected to the outer side of the hydraulic transmission pipe 302. The outer diameter of the retaining ring 402 is larger than the inner diameter of the bearing 403 and the inner diameter of the medium port 212 of the hub 201, and the retaining ring 402 is located between the bearing 403 and the medium port 212.

[0040] Since the retaining ring 402 limits the overall assembly formed by other components of the adapter 4 and the hub 201, preventing it from sliding axially along the hydraulic transfer pipe 302, under the combined action of the bearing 403 and the retaining ring 402, on the one hand, the hub 201 can freely rotate relative to the hydraulic transfer pipe 302 around the axis of the hydraulic transfer pipe 302, and on the other hand, it will not slide axially along the hydraulic transfer pipe 302 and fall off, thus ensuring the stable operation of the transport trolley. A stop piece 404 can also be provided in the adapter 4. The stop piece 404 is sleeved outside the hydraulic transfer pipe 302 and is located between the retaining ring 402 and the hub 201, and is used to prevent the leakage of hydraulic medium. In addition, a large nut 405 can be provided. The large nut 405 is threadedly connected to the outer wall surface of the medium port 212, and one side of the large nut 405 is in contact with the adapter 4, and is used to make the connection between the hub 201 and the adapter 4 more firm.

[0041] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A transport trolley, characterized in that: include: Frame (1); At least two multi-wheel devices (2), each of the multi-wheel devices (2) comprising a wheel hub (201), a support rod (202) and a roller (203), the wheel hub (201) being rotatably mounted on the frame (1), at least three support rods (202) extending radially along the wheel hub (201) being mounted on the wheel hub (201), all the support rods (202) being evenly distributed in a circumference around the center of the wheel hub (201), and the roller (203) being mounted at the end of the support rod (202); The support rod (202) is movable in the radial direction of the wheel hub (201) on which it is located, so that the roller (203) moves closer to or farther away from the center of the wheel hub (201).

2. The transport trolley according to claim 1, characterized in that: The hub (201) is provided with a medium tank (213) and at least three cylindrical hydraulic cylinders (211) evenly distributed along the circumference around the center of the hub (201); The first end of the medium groove (213) is connected to all the cylindrical hydraulic cylinders (211), and the second end of the medium groove (213) is a medium port (212) for hydraulic medium to flow in and out, and the medium port (212) is arranged at the rotation center of the wheel hub (201); The first end of the support rod (202) is located in the cylindrical hydraulic cylinder (211) and is driven to move by hydraulic pressure, the second end of the support rod (202) extends out of the cylindrical hydraulic cylinder (211) and is connected to the roller (203), and the moving direction of the support rod (202) is along the radial direction of the wheel hub (201); The transport trolley also includes a hydraulic supply system (3) fixedly arranged on the frame (1), and the hydraulic supply system (3) is connected to the medium port (212) in a rotationally sealed manner.

3. The transport trolley according to claim 2, characterized in that: The hydraulic supply system (3) comprises a hydraulic pump (301) and a fixedly arranged hydraulic transmission pipe (302), wherein the hydraulic transmission pipe (302) is a hollow tubular structure with openings at both ends. The hydraulic pump (301) is provided with a pump outlet (331) and a pump inlet (332) of the hydraulic medium, and the surface of the hydraulic transmission pipe (302) is provided with an inflow port (321) and a return port (322) of the hydraulic medium, and the pump outlet (331) and the pump inlet (332) of the hydraulic pump (301) are respectively connected with the inflow port (321) and the return port (322) of the hydraulic transmission pipe (302); Both ends of the hydraulic transmission pipe (302) are respectively connected to the medium port (212) of the hub (201) in a rotatable sealed manner.

4. The transport trolley according to claim 3, characterized in that: The outer diameters of the two ends of the hydraulic transmission pipe (302) are narrowed to form terminal portions (323), the outer diameter of the terminal portions (323) matches the inner diameter of the medium port (212), and the terminal portions (323) extend into the interior of the medium port (212).

5. The transport trolley according to claim 3, characterized in that: A bracket (303) is fixedly arranged on the hydraulic transmission pipe (302), and the hydraulic pump (301) is fixedly arranged on the bracket (303).

6. The transport trolley according to claim 3, characterized in that: The frame (1) is provided with oppositely arranged fixing ear plates (101), and the fixing ear plates (101) are provided with mounting holes; and also includes a stopper (102); The two ends of the hydraulic transmission pipe (302) are respectively inserted into the mounting holes of the two fixed ear plates (101), and the limiter (102) is respectively fixedly connected to the vehicle frame (1) and the hydraulic transmission pipe (302).

7. The transport trolley according to claim 3, characterized in that: It comprises an adapter (4), one end of which is rotatably connected to the hydraulic transmission pipe (302), and the other end of which is fixedly connected to the outer wall of the medium port (212) of the hub (201), and the rotation axis of the adapter (4) is the same as the rotation axis of the hub (201).

8. The transport trolley according to claim 7, characterized in that: The adapter (4) comprises an annular connecting member (401), a retaining ring (402) and a bearing (403); The first end of the annular connecting member (401) is threadedly connected to the outer wall of the medium port (212) of the hub (201), and the second end is sleeved on the end of the hydraulic transmission pipe (302). The bearing (403) is arranged between the second end of the annular connecting member (401) and the hydraulic transmission pipe (302) in a tight fit manner; The inner side of the retaining ring (402) is threadedly connected to the outer side of the hydraulic transmission pipe (302); the outer diameter of the retaining ring (402) is larger than the inner diameter of the bearing (403) and the inner diameter of the medium port (212) of the wheel hub (201); and the retaining ring (402) is located between the bearing (403) and the medium port (212).

9. The transport trolley according to claim 8, characterized in that: The adapter (4) further comprises a stopper (404), wherein the stopper (404) is sleeved on the outside of the hydraulic transmission pipe (302) and is located between the retaining ring (402) and the wheel hub (201).

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