Wheel transport vehicle

Abstract

The utility model discloses a wheeled transport vehicle, comprising a chassis, front wheels, rear wheels, a bucket, an engine, a transmission device, a left handlebar, a right handlebar and a control unit. The chassis is a rectangular box, and there are two front wheels, which are symmetrically arranged on the left and right sides of the front end of the chassis. There are two rear wheels, both of which are universal wheels, which are symmetrically arranged on the left and right sides of the rear end of the chassis, and the bucket is rotatably connected to the front end of the chassis. The engine drives the two front wheels forward or backward through the transmission device. The left handlebar and the right handlebar are respectively arranged on the left and right sides of the rear of the bucket, the front end of the left handlebar is fixedly connected to the rear end of the bucket, and the front end of the right handlebar is fixedly connected to the chassis. The control unit includes a throttle handle assembly, a control handle 1, a control handle 2 and a safety handle assembly. The utility model replaces the existing transport vehicle that relies on human power driving, saves time and labor, carries a large amount of cargo, bears a large load, has a simple transmission device structure, low manufacturing cost, is easy to control the bucket to flip and unload, is easy to operate, and has high transportation efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of transport equipment, in particular to a wheeled transport vehicle. Background Art

[0002] Transport trucks are widely used in production and life. They are small-sized transport tools for bulk materials, industrial semi-finished products and industrial finished products. They are low-cost, simple to maintain, easy to operate and light in weight. They are widely used in warehouses, manufacturing plants, department stores, logistics centers and freight stations. They are very convenient and flexible when transporting items over short distances. The production site of a manufacturing plant often uses transport trucks to transport bulk materials and industrial semi-finished products between different workstations, or to transport industrial finished products to a warehouse for storage. Existing transport trucks have a simple structure and are usually not equipped with a power mechanism. They rely on manpower to push the transport truck forward or manpower to pull the transport truck backward. The operation is time-consuming and labor-intensive, with high labor costs and low efficiency. In addition, after arriving at the destination, the goods need to be unloaded manually. Existing transport trucks have the defects of small single-load capacity, small load-bearing capacity, complex operation, high cost and low work efficiency. Therefore, the existing technology urgently needs to be further improved and improved. Utility Model Content

[0003] In view of the deficiencies of the above-mentioned prior art, the purpose of the utility model is to propose a wheeled transport vehicle to solve the problems that the existing transport vehicles rely on human power to move, manual operation is time-consuming and labor-intensive, the single cargo capacity is small, the load-bearing capacity is small, manual unloading of cargo is required, the operation is complicated, the cost is high and the work efficiency is low.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A wheeled transporter comprises a chassis, front wheels, rear wheels, a bucket, an engine, a transmission device, a left handlebar, a right handlebar and a control unit. The chassis is a rectangular box arranged longitudinally and horizontally. The two front wheels are symmetrically arranged on the left and right sides of the front end of the chassis through a worm gear reducer equipped with a clutch.

[0006] There are two rear wheels and both are universal wheels. The two rear wheels are symmetrically arranged on the left and right sides of the rear end of the chassis through a rear cross beam. The truck bed is located above the chassis. The truck bed is rotatably connected to the front end of the chassis through a tipping frame located at the bottom thereof, and the rear end of the tipping frame is plugged and fixedly connected to the chassis through a locking mechanism.

[0007] The transmission device is arranged inside the chassis, the engine is located at the rear side of the truck and fixedly mounted on the top of the chassis, and its output shaft extends into the chassis and is connected to the input end of the worm gear reducer through the transmission device.

[0008] The left handlebar and the right handlebar are respectively arranged on the left and right sides of the rear of the vehicle bucket, the front end of the left handlebar is fixedly connected to the left side of the overturning frame, and the front end of the right handlebar is fixedly connected to the chassis.

[0009] The control unit includes a throttle handle assembly, a control handle 1, a control handle 2 and a safety handle assembly. The throttle handle assembly and the control handle are respectively installed on the left and right sides of the upper part of the right handlebar. The throttle handle assembly is used to control the throttle of the engine. The control handle 1 is connected to the clutch arranged on the worm gear reducer. The control handle 2 and the safety handle assembly are respectively connected to the transmission device.

[0010] Furthermore, the middle portion of the rear cross beam is fixed to the rear end of the chassis, and its two ends protrude outward relative to the left and right sides of the chassis, and two universal wheels are respectively installed at the bottom of the two ends of the rear cross beam.

[0011] The worm gear reducer is installed at the bottom of the chassis through a sealed housing, and both ends of its output shaft pass through the sealed housing and are fixedly connected to the wheel hubs of the front wheels to drive the two front wheels forward or backward respectively.

[0012] Furthermore, the middle part of the left handlebar is fixedly connected to the right rear end of the flip frame through an L-shaped reinforcing rod, a fastener is fixed to the side of the L-shaped reinforcing rod close to the right handlebar, and the L-shaped reinforcing rod is hung on the right handlebar through the fastener.

[0013] The control handle 2 is installed on the horizontal section of the L-shaped reinforcement rod.

[0014] Furthermore, the transmission device includes a driving pulley, a transition pulley, a driven pulley, a first tensioning mechanism and a second tensioning mechanism. The driving pulley is installed on the output shaft of the engine, and the driven pulley is installed on the input end of the worm gear reducer.

[0015] The transition pulley is located between the driving pulley and the driven pulley. The driving pulley is connected to the transition pulley through a first transmission belt, and the transition pulley is connected to the driven pulley through a second transmission belt. In addition, the transition pulley is also connected to the driven pulley through a third transmission belt.

[0016] The first tensioning mechanism is arranged on the outside of the second transmission belt, and the second transmission belt realizes the transmission of rotation between the transition pulley and the driven pulley through the first tensioning mechanism. The second tensioning mechanism is arranged on the rear side of the transition pulley, and the third transmission belt realizes the transmission of rotation between the transition pulley and the driven pulley through the second tensioning mechanism.

[0017] Furthermore, the driving pulley is a single-groove pulley, the transition pulley is a three-groove pulley, the upper and lower ends of the wheel shaft are rotatably matched with the chassis, the driven pulley is a three-groove pulley, and the first transmission belt, the second transmission belt and the third transmission belt are all V-belts.

[0018] The first transmission belt is located in the annular groove at the top of the transition pulley, the second transmission belt is located in the annular groove at the bottom of the transition pulley, and the third transmission belt is located in the annular groove in the middle of the transition pulley.

[0019] Furthermore, the first tensioning mechanism includes a rocker arm, a first tensioning wheel and a tension spring, one end of the rocker arm is rotatably connected to the chassis, the first tensioning wheel is rotatably arranged at the other end of the rocker arm, one end of the tension spring is connected to the middle part of the rocker arm, and the other end is connected to the side wall of the chassis, and in addition, the side of the middle part of the rocker arm opposite to the tension spring is connected to the steel wire of the safety handle assembly.

[0020] Furthermore, the second tensioning mechanism includes a guide seat, an adjustment frame, a guide rod, a spring and two second tensioning wheels. The guide seat is installed at the bottom of the chassis. The guide rod is longitudinally and horizontally slidably penetrated in the guide seat. The front end of the guide rod is fixedly connected to the middle part of the adjustment frame, and the rear end of the guide rod is connected to two steel wires of the control handle.

[0021] The spring sleeve is arranged on the guide rod and is located between the guide seat and the adjustment frame. The two second tensioners are located on the rear side of the transition pulley and are symmetrically arranged on the top of the adjustment frame. The two sides of the rear end of the third transmission belt respectively pass around the two second tensioners and cooperate with the front side of the second tensioners. A retaining cover is arranged on the rear side of each second tensioner.

[0022] Furthermore, two first upright poles are symmetrically arranged on the left and right sides of the rear portion of the second transmission belt, and two second upright poles are symmetrically arranged on the left and right sides of the front portion of the third transmission belt.

[0023] Two first cross bars are symmetrically arranged on the left and right sides of the front of the third transmission belt, and two second cross bars are symmetrically arranged on the left and right sides of the rear of the third transmission belt. Both the first cross bar and the second cross bar are located at the lower side of the third transmission belt, and their ends are fixedly connected to the side wall of the chassis.

[0024] By adopting the above technical scheme, the beneficial technical effect of the utility model is as follows: the wheeled transporter of the utility model is equipped with a power mechanism, which replaces the existing transporter relying on human drive, saves time and effort, carries a large amount of cargo, bears a large load, has a simple transmission device structure and low manufacturing cost, is easy to control the flipping of the vehicle bucket to achieve self-unloading, is easy to operate, and has high transportation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The utility model is a three-dimensional structural schematic diagram of a wheeled transport vehicle.

[0026] Figure 2 yes Figure 1 A schematic diagram of a structure of a part of the vehicle, showing the chassis, right handlebar and related parts.

[0027] Figure 3 yes Figure 1The structural schematic diagram of another part in the figure shows the truck bed, the left handlebar and the turning frame.

[0028] Figure 4 It is a structural schematic diagram of the chassis and transmission device of the utility model.

[0029] Figure 5 It is a schematic diagram of the structural principle of the transmission device of the utility model.

[0030] Figure 6 It is a structural schematic diagram of the second tensioning mechanism of the utility model. DETAILED DESCRIPTION

[0031] The utility model is described in detail below with reference to the accompanying drawings:

[0032] Combination Figures 1 to 6 A wheeled transporter includes a chassis 1, front wheels 11, rear wheels 12, a bucket 2, an engine 3, a transmission device, a left handlebar 81, a right handlebar 82 and a control unit. The chassis 1 is a rectangular box arranged longitudinally and horizontally, and a steel frame is installed inside the rectangular box. The chassis 1 has a high load-bearing capacity.

[0033] Specifically, there are two front wheels 11, and the two front wheels 11 are symmetrically arranged on the left and right sides of the front end of the chassis 1 through a worm gear reducer 4 equipped with a clutch. The worm gear reducer 4 is fixedly installed on the front bottom side of the chassis 1, and the worm gear reducer 4 is encapsulated at the bottom of the chassis 1 through a sealed housing 14. Both ends of the turbine shaft of the worm gear reducer 4 pass through the side wall of the sealed housing 14 and are fixedly connected to the wheel hubs of the two front wheels 11 respectively. The two output ends of the worm gear reducer 4 drive the two front wheels 11 to rotate forward or backward, so as to realize the forward or backward movement of the wheeled transport vehicle.

[0034] There are two rear wheels 12 and both are universal wheels. The two rear wheels 12 are symmetrically arranged on the left and right sides of the rear end of the chassis 1 through the rear cross beam 13. Specifically, the rear cross beam 13 is horizontally arranged on the rear side of the chassis 1, and the middle part of the rear cross beam 13 is fixedly welded to the rear end of the chassis 1 as a whole. The two ends of the rear cross beam 13 protrude outward relative to the left and right sides of the chassis 1. The two universal wheels are respectively installed at the bottom of the two ends of the rear cross beam 13. The universal wheels can rotate horizontally relative to the rear cross beam 13, and the steering of the wheeled transporter is achieved by controlling the left handlebar 81 and the right handlebar 82.

[0035] The truck bed 2 is located above the chassis 1. The truck bed 2 is rotatably connected to the front end of the chassis 1 through the flip frame 21 located at the bottom thereof. The rear end of the flip frame 21 is plugged and fixedly connected to the chassis 1 through a locking mechanism. The front bottom of the flip frame 21 is rotatably connected to two bearing seats fixed to the top of the front side of the chassis 1 through a rotating shaft. The bottom of the truck bed 2 is bolted and fixedly connected to the flip frame 21. Four rubber pads 19 are regularly arranged on the top of the chassis 1. The rubber pads 19 support the bottom of the flip frame 21 and have a buffering effect. The locking mechanism adopts the existing technology and can detachably and fixedly connect the rear end of the flip frame 21 to the chassis 1. After unlocking, the truck bed 2 and the flip frame 21 will flip upward and forward around the rotating shaft to unload the goods in the truck bed 2. After that, the truck bed 2 and the flip frame 21 are reset, and the locking mechanism fixes the rear end of the flip frame 21 to the chassis 1.

[0036] The left handlebar 81 and the right handlebar 82 are respectively arranged on the left and right sides of the rear of the truck bed 2. The front end of the left handlebar 81 is fixedly connected to the left side of the flip frame 21, and the front end of the right handlebar 82 is fixedly connected to the chassis 1. The middle part of the left handlebar 81 is fixedly connected to the right rear end of the flip frame 21 through an L-shaped reinforcing rod 83. A fastener is fixed on the side of the L-shaped reinforcing rod 83 close to the right handlebar 82. The L-shaped reinforcing rod 83 is hung on the right handlebar 82 through a fastener 84. The fastener is a hook-shaped structure. After the truck bed 2 is reset, the fastener can be hung on the rod body part of the right handlebar 82 through elastic deformation. After the locking mechanism contacts the flip frame 21, the fastener can be separated from the rod body part of the right handlebar 82 by pushing the left handlebar 81 upward, and the truck bed 2 and the flip frame 21 will flip upward and forward around the rotating axis to unload the goods in the truck bed 2.

[0037] The control unit includes a throttle handle assembly 91, a control handle 1 92, a control handle 2 93 and a safety handle assembly 94. The throttle handle assembly 91 and the control handle are respectively mounted on the left and right sides of the upper part of the right handlebar 82. The throttle handle assembly 91 is used to control the throttle of the engine 3. The control handle 1 92 is connected to the clutch arranged on the worm gear reducer 4. The control handle 2 93 is mounted on the horizontal section of the L-shaped reinforcing rod 83. The safety handle assembly 94 is mounted on the upper side of the rear end of the left handlebar 81. The control handle 2 93 and the safety handle assembly 94 are respectively connected to the transmission device. When the control handle 1 92 is tightened, the worm gear reducer 4 will not transmit power to the two front wheels 11; when the control handle 1 92 is loosened, the worm gear reducer 4 transmits power to the two front wheels 11, driving the two front wheels 11 to rotate, so as to realize the forward or backward movement of the wheeled transport vehicle.

[0038] The transmission device is arranged inside the chassis 1, the engine 3 is located at the rear side of the truck bed 2 and is fixedly mounted on the top of the chassis 1, and its output shaft extends into the chassis 1 and is connected to the input end of the worm gear reducer 4 through the transmission device. The output end of the engine 3 can drive the worm shaft of the worm gear reducer 4 to rotate through the transmission device, thereby realizing the forward or backward rotation of the two front wheels 11.

[0039] Specifically, the transmission device includes a driving pulley 51, a transition pulley 52, a driven pulley 53, a first tensioning mechanism and a second tensioning mechanism. The driving pulley 51 is installed on the output shaft of the engine 3, and the output shaft of the engine 3 drives the driving pulley 51 to rotate at a constant speed. The driven pulley 53 is installed on the upper end of the worm shaft of the worm gear reducer 4.

[0040] The transition pulley 52 is located between the driving pulley 51 and the driven pulley 53. The driving pulley 51 is connected to the transition pulley 52 through a first transmission belt 54. The transition pulley 52 is connected to the driven pulley 53 through a second transmission belt 55. In addition, the transition pulley 52 is also connected to the driven pulley 53 through a third transmission belt 56.

[0041] Specifically, the driving pulley 51 is a single-groove pulley, the transition pulley 52 is a three-groove pulley, the upper and lower ends of the wheel shaft are both rotatably matched with the chassis 1, the driven pulley 53 is a three-groove pulley, and the first transmission belt 54, the second transmission belt 55 and the third transmission belt 56 are all V-belts. The first transmission belt 54 is located in the annular groove at the top of the transition pulley 52, the second transmission belt 55 is located in the annular groove at the bottom of the transition pulley 52, and the third transmission belt 56 is located in the annular groove in the middle of the transition pulley 52.

[0042] The first tensioning mechanism is arranged on the outer side of the second transmission belt 55, and the second transmission belt 55 transmits rotation between the transition pulley 52 and the driven pulley 53 through the first tensioning mechanism. The second tensioning mechanism is arranged on the rear side of the transition pulley 52, and the third transmission belt 56 transmits rotation between the transition pulley 52 and the driven pulley 53 through the second tensioning mechanism.

[0043] The first tensioning mechanism includes a rocker arm 61, a first tensioning wheel 62 and a tension spring 63. One end of the rocker arm 61 is rotatably connected to the chassis 1, and the first tensioning wheel 62 is rotatably set at the other end of the rocker arm 61. One end of the tension spring 63 is connected to the middle part of the rocker arm 61, and the other end is connected to the side wall of the chassis 1. In addition, the side of the middle part of the rocker arm 61 opposite to the tension spring 63 is connected to the steel wire of the safety handle assembly 94.

[0044] The second tensioning mechanism includes a guide seat 71, an adjustment frame 72, a guide rod 73, a spring 74 and two second tensioning wheels 75. The guide seat 71 is installed at the bottom of the chassis 1. The guide rod 73 is longitudinally and horizontally slidably penetrated in the guide seat 71. The front end of the guide rod 73 is fixedly connected to the middle part of the adjustment frame 72, and the rear end of the guide rod 73 is connected to the control handle 2 93 steel wire.

[0045] The spring 74 is sleeved on the guide rod 73 and is located between the guide seat 71 and the adjustment frame 72. The two second tensioners 75 are located on the rear side of the transition pulley 52 and are symmetrically arranged on the top of the adjustment frame 72. The rear end of the third transmission belt 56 passes around the two second tensioners 75 on both sides and cooperates with the front side of the second tensioners 75. A retaining cover 76 is arranged on the rear side of each second tensioner 75, and a retaining cover 76 is also arranged on the front side of the driven pulley 53. The function of the retaining cover 76 is to prevent the V-belt from separating from the corresponding pulley in a relaxed state, thereby solving the problem of difficulty in resetting when tightening again.

[0046] When the wheeled transport vehicle moves forward, the safety handle assembly 94 pulls the rocker arm 61 through the steel wire, so that the first tensioner 62 is pressed against the outer side of the second transmission belt 55, so that the second transmission belt 55 is in a tensioned state, and the transition pulley 52 transmits power to the driven pulley 53 through the second transmission belt 55, and the driven pulley 53 drives the two front wheels 11 to rotate forward through the worm gear reducer 4, so that the wheeled transport vehicle moves forward. At this time, the third transmission belt 56 is in a loose state, and the transition pulley 52 does not transmit power to the driven pulley 53 through the third transmission belt 56.

[0047] When the wheeled transport vehicle moves backward, the safety handle assembly 94 releases the tension on the rocker arm 61 through the steel wire, and the tension spring 63 pulls the rocker arm 61 to move to the side away from the second transmission belt 55, and the first tensioner 62 is separated from the second transmission belt 55. At the same time, the control handle 2 93 pulls the guide rod 73 through the steel wire, so that the adjustment frame 72 and the two second tensioners 75 move backward, so that the third transmission belt 56 is in a tensioned state, and the transition pulley 52 transmits power to the driven pulley 53 through the third transmission belt 56. The driven pulley 53 drives the two front wheels 11 to rotate backward through the worm gear reducer 4, so that the wheeled transport vehicle moves backward. At this time, the second transmission belt 55 is in a relaxed state, and the transition pulley 52 will not transmit power to the driven pulley 53 through the second transmission belt 55. In addition, after the control handle 2 93 releases the pulling on the guide rod 73 , the adjustment frame 72 is reset under the action of the spring 74 , the third transmission belt 56 is in a relaxed state, and the transition pulley 52 will not transmit power to the driven pulley 53 through the third transmission belt 56 .

[0048] Two first vertical rods 15 are symmetrically arranged on the left and right sides of the rear part of the second transmission belt 55, and two second vertical rods 16 are symmetrically arranged on the left and right sides of the front part of the third transmission belt 56. The two first vertical rods 15 and the two second vertical rods 16 constrain the second transmission belt 55 in a relaxed state, so that the second transmission belt 55 can transmit power after being tightened again, so that the wheeled transport vehicle can move forward. Two first cross bars 17 are symmetrically arranged on the left and right sides of the front part of the third transmission belt 56, and two second cross bars 18 are symmetrically arranged on the left and right sides of the rear part of the third transmission belt 56. The first cross bar 17 and the second cross bar 18 are both located at the lower side of the third transmission belt 56, and their ends are fixedly connected to the side wall of the chassis 1. The two first cross bars 17 and the two second cross bars 18 constrain the third transmission belt 56 in a relaxed state, so as to prevent it from falling too far and being difficult to reset when tightened again.

[0049] The parts not described in the present invention can be realized by adopting or drawing on the existing technology.

[0050] Furthermore, the terms “first” and “second” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0051] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0052] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A wheeled transport vehicle, characterized in that: The vehicle comprises a chassis, front wheels, rear wheels, a bucket, an engine, a transmission device, a left handlebar, a right handlebar and a control unit. The chassis is a rectangular box arranged longitudinally and horizontally. There are two front wheels. The two front wheels are symmetrically arranged on the left and right sides of the front end of the chassis through a worm gear reducer equipped with a clutch. There are two rear wheels, both of which are universal wheels. The two rear wheels are symmetrically arranged on the left and right sides of the rear end of the chassis through the rear cross beam. The truck bucket is located above the chassis. The truck bucket is rotatably connected to the front end of the chassis through a turning frame located at the bottom of the truck bucket. The rear end of the turning frame is plugged and fixedly connected to the chassis through a locking mechanism. The transmission device is arranged inside the chassis, the engine is located at the rear side of the truck and fixedly mounted on the top of the chassis, and its output shaft extends into the chassis and is connected to the input end of the worm gear reducer through the transmission device; The left handlebar and the right handlebar are respectively arranged on the left and right sides of the rear of the truck bed, the front end of the left handlebar is fixedly connected to the left side of the flip frame, and the front end of the right handlebar is fixedly connected to the chassis; The control unit includes a throttle handle assembly, a control handle 1, a control handle 2 and a safety handle assembly. The throttle handle assembly and the control handle are respectively installed on the left and right sides of the upper part of the right handlebar. The throttle handle assembly is used to control the throttle of the engine. The control handle 1 is connected to the clutch arranged on the worm gear reducer. The control handle 2 and the safety handle assembly are respectively connected to the transmission device.

2. A wheeled transport vehicle according to claim 1, characterized in that: The middle part of the rear cross beam is fixed to the rear end of the chassis, and its two ends protrude outward relative to the left and right sides of the chassis. Two universal wheels are respectively installed at the bottom of the two ends of the rear cross beam; The worm gear reducer is installed at the bottom of the chassis through a sealed housing, and both ends of its output shaft pass through the sealed housing and are fixedly connected to the wheel hubs of the front wheels to drive the two front wheels forward or backward respectively.

3. A wheeled transport vehicle according to claim 1, characterized in that: The middle part of the left handlebar is fixedly connected to the right rear end of the flip frame through an L-shaped reinforcement rod, a fastener is fixed on the side of the L-shaped reinforcement rod close to the right handlebar, and the L-shaped reinforcement rod is hung on the right handlebar through the fastener; The control handle 2 is installed on the horizontal section of the L-shaped reinforcement rod.

4. A wheeled transport vehicle according to claim 1, characterized in that: The transmission device comprises a driving pulley, a transition pulley, a driven pulley, a first tensioning mechanism and a second tensioning mechanism, wherein the driving pulley is mounted on the output shaft of the engine, and the driven pulley is mounted on the input end of the worm gear reducer; The transition pulley is located between the driving pulley and the driven pulley, the driving pulley is connected to the transition pulley through the first transmission belt, the transition pulley is connected to the driven pulley through the second transmission belt, and in addition, the transition pulley is also connected to the driven pulley through the third transmission belt; The first tensioning mechanism is arranged on the outside of the second transmission belt, and the second transmission belt realizes the transmission of rotation between the transition pulley and the driven pulley through the first tensioning mechanism. The second tensioning mechanism is arranged on the rear side of the transition pulley, and the third transmission belt realizes the transmission of rotation between the transition pulley and the driven pulley through the second tensioning mechanism.

5. A wheeled transport vehicle according to claim 4, characterized in that: The driving pulley is a single-groove pulley, the transition pulley is a three-groove pulley, the upper and lower ends of the wheel shaft are both rotatably matched with the chassis, the driven pulley is a three-groove pulley, and the first transmission belt, the second transmission belt and the third transmission belt are all V-belts; The first transmission belt is located in the annular groove at the top of the transition pulley, the second transmission belt is located in the annular groove at the bottom of the transition pulley, and the third transmission belt is located in the annular groove in the middle of the transition pulley.

6. A wheeled transport vehicle according to claim 4, characterized in that: The first tensioning mechanism includes a rocker arm, a first tensioning wheel and a tension spring. One end of the rocker arm is rotatably connected to the chassis, and the first tensioning wheel is rotatably arranged at the other end of the rocker arm. One end of the tension spring is connected to the middle part of the rocker arm, and the other end is connected to the side wall of the chassis. In addition, the side of the middle part of the rocker arm opposite to the tension spring is connected to the steel wire of the safety handle assembly.

7. A wheeled transport vehicle according to claim 4, characterized in that: The second tensioning mechanism comprises a guide seat, an adjustment frame, a guide rod, a spring and two second tensioning wheels. The guide seat is installed at the bottom of the chassis. The guide rod is longitudinally and horizontally slidably inserted into the guide seat. The front end of the guide rod is fixedly connected to the middle of the adjustment frame. The rear end of the guide rod is connected to two steel wires of the control handle. The spring sleeve is arranged on the guide rod and is located between the guide seat and the adjustment frame. The two second tensioners are located on the rear side of the transition pulley and are symmetrically arranged on the top of the adjustment frame. The two sides of the rear end of the third transmission belt respectively pass around the two second tensioners and cooperate with the front side of the second tensioners. A retaining cover is arranged on the rear side of each second tensioner.

8. A wheeled transport vehicle according to claim 4, characterized in that: Two first upright poles are symmetrically arranged on the left and right sides of the rear part of the second transmission belt, and two second upright poles are symmetrically arranged on the left and right sides of the front part of the third transmission belt; Two first cross bars are symmetrically arranged on the left and right sides of the front of the third transmission belt, and two second cross bars are symmetrically arranged on the left and right sides of the rear of the third transmission belt. Both the first cross bar and the second cross bar are located at the lower side of the third transmission belt, and their ends are fixedly connected to the side wall of the chassis.

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