Two-wheel wheelbarrow with clamping and auxiliary forward pushing functions

Abstract

The present invention relates to a two-wheeled handcart with tightening and auxiliary forward pushing functions, which are mainly used in transporting large goods. The two-wheeled handcart comprises a retractable frame, a wheel and a shovel plate are arranged at the bottom end of the frame, a tightening device is arranged in the middle of the frame, and an auxiliary forward pushing device is arranged below the tightening device, the two share a power system, and some parts of the transmission systems of the two are shared; the tightening device comprises: two strap reels with automatic winding function when unloaded, a power mechanism for driving the strap to tighten when loaded, an upper transmission mechanism connected to the power mechanism, and a clutch switching mechanism arranged between the power mechanism and the upper transmission mechanism for selecting and switching the power output target; the present invention can greatly improve labor efficiency, reduce labor intensity, and improve the safety of the transport process when transporting large goods, and the auxiliary forward pushing device can also be used as the third supporting wheel after appropriate adjustment, so that the cart only needs to pay thrust to move.

Description

Technical Field

[0001] The invention belongs to the technical field of wheelbarrows, in particular to a two-wheeled wheelbarrow with tightening and auxiliary forward pushing functions, which is particularly suitable for industrial production. Background Art

[0002] The applicant's prior utility model patent authorization announcement number: CN203306052U Two-wheeled trolleys are suitable for tourists, students, housewives, the elderly, etc. to carry luggage and heavy objects when traveling. In fact, two-wheeled trolleys are also widely used in industrial production. When used in industry, they are generally made of thicker materials to be able to bear larger volume and weight. They are often used in, for example, the loading and unloading of material warehouses;

[0003] Usually, when a two-wheeled cart is used to carry large and heavy goods, such as refrigerators, two people are needed to cooperate. First, one person pushes the goods on one side to create a gap between one side and the ground, and then the other person pushes the two-wheeled cart to make the shovel enter the gap. During transportation, since the center of gravity of the heavy goods is always on the wheels and the parts lifted by the arms, the operators' arms are prone to fatigue. In addition, in order to ensure that the goods do not slip sideways, the entire process of transportation also requires two people to share the work. Summary of the invention

[0004] In view of the above problems, the present invention provides a two-wheeled trolley with tightening and auxiliary forward pushing functions, which is particularly suitable for industrial production. The trolley can be used by a single person to move large goods and the work becomes easier than before.

[0005] The invention objective of the present invention is achieved through the following technical scheme: a two-wheeled handcart with clamping and auxiliary forward pushing functions, which are mainly used when carrying large goods, including a retractable frame, a wheel and a shovel plate are arranged at the bottom of the frame, a clamping device is arranged in the middle of the frame, and an auxiliary forward pushing device is arranged below the clamping device. The clamping device and the auxiliary forward pushing device share a power system, and some parts of the transmission system of the two are shared and switched through a clutch mechanism;

[0006] The clamping device includes: two clamping belt reels with automatic winding function when unloaded, a power mechanism for driving the clamping belt to be tightened when loaded, an upper transmission mechanism connected to the power mechanism, and a clutch switching mechanism arranged between the power mechanism and the upper transmission mechanism to select and switch the power output target;

[0007] The auxiliary forward push device includes: a lower transmission mechanism connected to the upper transmission mechanism, a slide seat that can be lifted up and down with the start of the power mechanism under the switching of the clutch switching mechanism, a support arm hinged to the slide seat, and a driven universal caster fixedly mounted at the end of the support arm;

[0008] When in use, the operator pushes the cart in front of the cargo, and then pushes the cargo to the rear or side to create a gap on the bottom. The remote control power system is started, and the corresponding auxiliary forward pushing device is started to push the cart under the cargo. The operator removes the thrust so that the cargo is completely pressed on the shovel plate. The operator pulls out the hoop of the tightening device and then horizontally surrounds the cargo and docks it. Then the control power system is started, the hoop is tightened, and the cargo is tied to the frame as a whole. The auxiliary forward pushing device is properly adjusted and used as the third support wheel, so that the cart only needs to exert thrust to move.

[0009] Preferably, the center of the band of the band roll has holes spaced equidistantly, and the ends of the band are fixedly connected to the quick connectors, which is very convenient to use.

[0010] Preferably, the upper transmission mechanism includes a horizontal beam fixed on the frame, a horizontal base plate installed on the horizontal beam and the two are fixedly connected, shafts and shaft matching assemblies for installing the shafts are fixedly arranged on the two side surfaces and near the ends of the horizontal base plate, both shafts are provided with pin wheels connected by pin keys, the two pin wheels are coaxially connected to a belt transmission assembly on the side close to the frame, the mounting shafts of the pulleys at the other ends of the two belt transmission assemblies are extended to install gears, and the two gears are meshed; the hoop roll is installed between the gear and the coaxial pulley in the belt transmission assembly.

[0011] Preferably, the structure of the needle wheel is composed of three ring layers when viewed inward from the side away from the frame. The three ring layers are a flat, integrated structure on one side of the frame. The needle holes of the outer ring layer and the middle layer have a circumferential array spacing that is consistent with the spacing of the hoop holes. A needle tooth is slidably installed in each needle hole, and both ends of the needle tooth are round heads. A spring assembly is provided in the gap between the outer ring layer and the middle layer.

[0012] Preferably, the power mechanism includes a drive motor drivingly connected to one of the shafts.

[0013] Preferably, the clutch switching mechanism includes two clutch plates which are movably mounted on two shafts and located on a side away from the frame, a switching rod with each end passing through one of the clutch plates from the side and hinged to the horizontal bottom plate, a handle which is fixedly connected to the middle part of the switching rod and extends downward, a buckling portion fixed to the handle for limiting the downward or upward stroke of the handle, and a joint portion fixed to the shaft matching component to cooperate with the buckling portion to complete the locking.

[0014] Preferably, the end of the clutch disc with the largest diameter is a conical surface, which abuts against the needle teeth, and the clutch disc has through holes on both sides of the axis for the switch rod to pass through.

[0015] Preferably, the lower transmission mechanism includes a transmission screw sleeved on one mounting shaft, a stabilizing rod sleeved on another mounting shaft, and a limit seat fixed on the frame for rotatably mounting the transmission screw and the stabilizing rod; the upward end of the transmission screw after installation is a first spline head, and a second spline head of the same specification is arranged on the corresponding mounting shaft, and the lower transmission mechanism also includes a spline sleeve sleeved outside the two spline heads, one end of which is fixed on the limit seat and the other end of which is pressed against a spring seat on the spline sleeve.

[0016] Preferably, one end of the spline sleeve away from the spring seat is arranged to be an arc surface, and a push block extending to one side of the arc surface is fixedly arranged on the handle, the push block has an inclined surface, and the inclined surface contacts the arc surface of the spline sleeve, and a positioning pin which can be adjusted in multiple gears is arranged on the outer side of the hinge between the support arm and the slide seat.

[0017] Preferably, the belt-driven universal caster is replaced with an ordinary universal caster, and a turbine energy storage assembly is added at the hinge of the support arm and the slide seat. The turbine energy storage assembly includes a one-way transmission turbine, which is coaxial with the turbine and hidden in the support arm. A synchronous belt output assembly is added to transmit the stored power, and the ordinary universal caster is arranged so that the wheel is on one side, the center of the wheel has teeth, and the wheel can be adjusted up and down in height. A gear is fixedly rotatably arranged to mesh with the gear on the wheel, and one synchronous wheel of the synchronous belt output assembly is coaxial with the gear and the other synchronous wheel is coaxial with the coil spring.

[0018] In summary, the present invention has the following advantages compared with the prior art:

[0019] The present invention can greatly improve labor efficiency, reduce labor intensity, and increase the safety of the transportation process when transporting large goods. First, the clamping device in the middle of the frame improves stability and is easy to use. It only needs to be pulled and buckled when in use. When loosening, there is no need to retract the rope, and there will be no slipping during transmission. Its power system is shared with the auxiliary forward pushing device, and some parts of the transmission systems of the clamping device and the auxiliary forward pushing device are shared. They can be used by simply switching the clutch mechanism. Therefore, the volume of the overall structure is very small, and the structure with mechanical parts as the main body makes it difficult for both functions to fail. The auxiliary forward pushing device can also be used as the third support wheel after proper adjustment, so that the movement of the cart only requires thrust. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a demonstration diagram of the present invention when in use;

[0021] Figure 2 It is a structural schematic diagram of the present invention;

[0022] Figure 3 It is a structural schematic diagram of another angle of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the clamping device;

[0024] Figure 5 It is a schematic diagram of the structure of the clamping device and the auxiliary forward pushing device;

[0025] Figure 6 is a structural schematic diagram of the upper transmission mechanism;

[0026] Figure 7 It is a schematic diagram of the structure of the clutch disc;

[0027] Figure 8 for Figure 6 A partial enlarged view of point A in the middle.

[0028] Markings in the figure: frame 01, wheel 02, shovel board 03, clamping device 10, clamping belt roll 11, power mechanism 12, drive motor 121, upper transmission mechanism 13, clutch switching mechanism 14, auxiliary forward pushing device 20, lower transmission mechanism 24, slide seat 21, support arm 22, universal caster 23 with drive, horizontal beam 04, horizontal bottom plate 05, shaft 131, pin wheel 132, pin tooth 1a, spring assembly 1b, belt transmission assembly 133, installation shaft 33a, gear 134, clutch The closing disc 141, the conical surface 1c, the through hole 1d, the switching rod 142, the handle 143, the buckling part 144, the joint part 145, the push block 44a, the transmission screw 241, the stabilizing light rod 242, the limit seat 243, the spline sleeve 244, the spring seat 245, the first spline head 41a, the second spline head 41b, the guide rail seat 07, the positioning pin 06, the ordinary universal caster 23a, the turbine energy storage assembly 40, the one-way transmission turbine 41, the coil spring 42, and the synchronous belt output assembly 50. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0030] Example 1

[0031] like Figure 1-2 As shown, an industrial two-wheeled trolley with tightening and auxiliary forward pushing functions, these two functions are mainly used when transporting large goods. Tightening refers to measures to stabilize the goods that need to be moved, and auxiliary forward pushing is to enable a single person to complete the transportation, that is, to overcome the situation mentioned in the background technology that requires two people to operate. The trolley mainly includes a retractable frame 01, the bottom end of the frame 01 is provided with wheels 02 and a shovel plate 03, a tightening device 10 is provided in the middle of the frame, and an auxiliary forward pushing device 20 is provided below the tightening device 10. The tightening device 10 and the auxiliary forward pushing device 20 share a power system, and some of the components of the transmission system of the two are shared and switched by a clutch mechanism. In this way, while the predetermined functions can be achieved, the overall volume and weight of the trolley do not increase significantly;

[0032] The clamping device 10 includes: two clamping belt reels 11 with an automatic winding function when unloaded, a power mechanism 12 for driving the clamping belt to be tightened when loaded, an upper transmission mechanism 13 connected to the power mechanism 12, and a clutch switching mechanism 14 arranged between the power mechanism 12 and the upper transmission mechanism 13 to select and switch the power output target;

[0033] The auxiliary forward pushing device 20 includes: a lower transmission mechanism 24 connected to the upper transmission mechanism 13, a slide 21 that can be lifted up and down with the start of the power mechanism 12 when the clutch switching mechanism 14 is switched, a support arm 22 hinged to the slide 21, and a driven universal caster 23 fixedly mounted at the end of the support arm 22;

[0034] With the help of the tightening device 10 and the auxiliary forward pushing device 20, this embodiment can transport goods by one person. When in use, the operator pushes the cart in front of the goods, and the operator pushes the goods to the rear or side to cause a gap on the bottom surface. The remote control power system is started, and the corresponding auxiliary forward pushing device 20 is started to push the cart under the goods. The operator unloads the thrust so that the goods are completely pressed on the shovel plate 03. The operator pulls out the strap of the tightening device 10 and then surrounds the goods horizontally and docks them. Then the control power system is started, the strap is tightened, and the goods are tied to the frame as a whole. The auxiliary forward pushing device 20 is properly adjusted and used as the third support wheel, so that the cart only needs to exert thrust to move.

[0035] like Figure 1-8 As shown, the center of the band of the band roll 11 has holes spaced equidistantly, and the function of the holes is to prevent the band from slipping when the band is tightened. The ends of the band are fixedly connected to the quick connectors for quick connection with each other;

[0036] The transmission mechanism 13 includes a horizontal beam 04 fixed on the frame 01, a horizontal base plate 05 installed on the horizontal beam and the two are fixedly connected, shafts 131 and shaft matching components are fixedly arranged on the two side surfaces and near the ends of the horizontal base plate 05, and the two shafts 131 are provided with pin wheels 132 connected by pin keys. The two pin wheels 132 are coaxially connected to a belt transmission component 133 on the side close to the frame. The mounting shafts 33a of the pulleys at the other ends of the two belt transmission components 133 are extended to install gears 134, and the two gears are meshed; the hoop roll 11 is installed between the gear 134 and the coaxial pulleys in the belt transmission component 133; the structure of the pin wheel 132 refers to Figure 6, viewed from the side away from the frame, it is composed of three circles. The three circles are a flat and integrated structure on one side of the frame. The circumferential array spacing of the outer circle layer and the middle layer is consistent with the spacing of the hoop holes. A needle tooth 1a is slidably installed in each needle hole. Both ends of the needle tooth 1a are round heads. A spring component 1b is provided in the gap between the outer circle layer and the middle layer. Under normal circumstances, the spring component 1b gathers the needle tooth 1a inward, and a thrust is applied to the needle tooth 1a at the gap between the inner circle layer and the middle layer, so that the needle tooth 1a is exposed from the outer circle layer and enters the hole of the hoop.

[0037] The power mechanism 12 includes a drive motor 121 drivingly connected to one of the shafts;

[0038] The clutch switching mechanism 14 includes two clutch plates 141 movably mounted on two shafts 131 and located on one side away from the frame, a switching rod 142 with each end passing through one of the clutch plates 141 from the side and hinged on the horizontal bottom plate 05, a handle 143 fixedly connected to the middle part of the switching rod 142 and extending downward, a buckle portion 144 fixed on the handle 143 for limiting the downward pressing or upward lifting stroke of the handle 143, and a joint portion 145 fixed on the shaft matching component to cooperate with the buckle portion 144 to complete the locking; the structure of the clutch plate 141 refers to Figure 7 The end with the largest diameter is a conical surface 1c, which contacts the needle tooth 1a. When the clutch disc 141 is pushed forward as a whole, the needle tooth 1a is pushed by the conical surface and extends into the hole of the hoop. After the clutch disc 141 loses the external force, it is pushed backward by the elastic force of the needle tooth 1a. The buckling part 144 and the engaging part 145 are provided to limit the position of the clutch disc 141. The clutch disc 141 has through holes 1d on both sides of the axis for the switching rod 142 to pass through;

[0039] The lower transmission mechanism 24 includes a transmission screw 241 sleeved on a mounting shaft 33a, a stabilizing light rod 242 sleeved on another mounting shaft 33a, and a limiting seat 243 fixed on the frame for rotatably mounting the transmission screw 241 and the stabilizing light rod 242; the transmission screw 241 has a first spline head 41a at one end facing upward after installation, and a second spline head 41b of the same specification is provided on the corresponding mounting shaft 33a. The lower transmission mechanism 24 also includes a spline sleeve 244 sleeved outside the two spline heads, one end of which is fixed on the limiting seat 243 and the other end of which is pressed against a spring seat 245 on the spline sleeve 244. Under normal conditions, the spring seat 245 pushes the spline sleeve 244 upward, and the spline sleeve 244 only engages with the second spline head 41b. When the spline sleeve 244 moves down a certain distance, it also engages with the first spline head 41a at the same time. At this time, the mounting shaft 33a can drive the transmission screw 241 to rotate together.

[0040] In order to facilitate the control of the downward movement and positioning of the spline sleeve 244, one end of the spline sleeve 244 away from the spring seat 245 is set to an arc surface, and a push block 44a extending to one side of the arc surface is fixedly set on the handle 143. The push block 44a has an inclined surface, and the inclined surface contacts the arc surface of the spline sleeve 244. After this design, the handle 143 can directly control whether the pin wheel 132 is effectively transmitted or invalidly transmitted by lifting or pulling down. When the pin wheel 132 is effectively transmitted, that is, the handle 143 is lifted to the buckling part 144 and the engaging part 145 to one of the preset connecting parts, at this time, the clutch disk 141 leans against the pin wheel 132, the conical surface 1c further contacts the root of the needle tooth 1a, the head of the needle tooth 1a enters the hoop, the rotation of the pin wheel 132 drives the hoop to move, and the spline sleeve 244 is lifted by the spring seat 245 , the transmission screw 241 will not be transmitted. When the handle 143 switches from the upward state to the downward pressure to the buckle part 144 and the joint part 145 to another preset connection part, at this time, the clutch disk 141 is away from the pin wheel 132, the conical surface 1c reduces the depth of the interference with the needle tooth 1a, the head of the needle tooth 1a retracts, and the hoop is withdrawn. The pin wheel 132 is idle, and the push block 44a presses the spline sleeve 244 to overcome the lifting force of the spring seat 245. The spline sleeve 244 meshes and connects the transmission screw 241 and the corresponding mounting shaft 33a at the same time. The transmission screw 241 obtains the transmission force to control the lifting and lowering of the slide 21, so that the auxiliary forward pushing device 20 can easily realize the forward pushing of the car. Here, a guide rail seat 07 needs to be fixed on the frame for the lifting and lowering of the slide 21 to ensure the stability of the movement of the slide 21. In addition, after the auxiliary forward pushing device 20 has completed the forward pushing action, it can be used as a third wheel for support by adjusting the angle, specifically, Figure 5 As shown, a multi-level adjustable positioning pin 06 is provided on the outer side of the hinge between the support arm 22 and the slide seat 21. When in use, the appropriate gear can be adjusted according to the needs. In this way, there is no need to exert arm strength to lift the goods when moving them, and they can be directly pushed. After unloading the goods, the two-wheel travel is faster and more flexible. Therefore, the support arm 22 needs to be folded up by the driving motor 121.

[0041] Example 2

[0042] The purpose of this embodiment is to replace the power of the caster with a set of transmission systems, so as to further reduce the power source. Specifically, on the basis of Embodiment 1, the belt-driven universal caster 23 is replaced with an ordinary universal caster 23a, and a turbine energy storage assembly 40 is added at the hinge between the support arm 22 and the slide seat 21. The turbine energy storage assembly 40 includes a one-way transmission turbine 41, a coil spring 42 coaxial with the turbine 41 and hidden in the support arm 22; a synchronous belt output assembly 50 is added to transmit the power after the energy is stored, and the ordinary universal caster 23a is set to have a wheel on one side, a circle of teeth in the center of the wheel, and the wheel can be adjusted up and down in height, and a fixed gear that can be rotatably set to mesh with the gear on the wheel, and the synchronous belt output assembly 50 is added to transmit the power after the energy is stored. One synchronous wheel of component 50 is coaxially arranged with the gear, and the other synchronous wheel is coaxially arranged with the coil spring 42. The working principle is that when the support arm 22 descends, the rotation of the transmission screw 241 drives the turbine 41 to rotate, and the coil spring 42 stores force. When the transmission screw 241 stops rotating, that is, the caster touches the ground, the coil spring 42 releases power at this time, drives the gear to rotate, and the gear drives the universal caster 23a to rotate, thereby making the car move forward. When used as a supporting wheel, the wheel of the universal caster 23a needs to be adjusted upward for a section to disengage it from the gear. In this way, when the wheel rotates, it will not interfere with the turbine energy storage assembly 40.

[0043] It should be pointed out that the present invention requires the use of lithium batteries to provide power support for the drive motor, and the lithium battery part is not shown in the figure.

[0044] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A two-wheeled handcart with tightening and auxiliary forward pushing functions, wherein the two functions are mainly used when transporting large goods, comprising a retractable frame (01), wherein the bottom end of the frame (01) is provided with wheels (02) and a shovel plate (03), Features A clamping device (10) is provided in the middle of the frame, and an auxiliary forward pushing device (20) is provided below the clamping device (10). The clamping device (10) and the auxiliary forward pushing device (20) share a power system, and some parts of the transmission systems of the two are shared and switched through a clutch mechanism. The clamping device (10) comprises: two clamping belt reels (11) having an automatic winding function when unloaded, a power mechanism (12) for driving the clamping belt to be tightened when loaded, an upper transmission mechanism (13) connected to the power mechanism (12), and a clutch switching mechanism (14) provided between the power mechanism (12) and the upper transmission mechanism (13) for selecting and switching a power output target; The auxiliary forward-pushing device (20) comprises: a lower transmission mechanism (24) transmission-connected to the upper transmission mechanism (13), a slide seat (21) which can be lifted up and down as the power mechanism (12) is activated when the clutch switching mechanism (14) is switched, a support arm (22) hingedly connected to the slide seat (21), and a driven universal caster (23) fixedly mounted on the end of the support arm (22); When in use, the operator pushes the cart in front of the cargo, and then pushes the cargo to the rear or side to create a gap on the bottom surface. The remote control power system is started, and the corresponding auxiliary forward pushing device (20) is started to push the cart under the cargo. The operator removes the thrust so that the cargo is completely pressed on the shovel plate (03). The operator pulls out the strap of the tightening device (10) and laterally surrounds the cargo and then docks the strap. The control power system is then started again, and the strap is tightened. The cargo is tied to the frame as a whole. The auxiliary forward pushing device (20) is appropriately adjusted and used as the third support wheel, so that the cart only needs to exert thrust to move forward.

2. The two-wheeled cart according to claim 1, It is characterized in that The center of the band of the band roll (11) has holes spaced at equal distances, and the ends of the band are fixedly connected to the quick connector.

3. The two-wheeled cart according to claim 1, It is characterized in that The upper transmission mechanism (13) comprises a horizontal crossbeam (04) fixed on the vehicle frame (01), a horizontal base plate (05) mounted on the horizontal crossbeam and the two are fixedly connected, shafts (131) and shaft matching components for mounting the shafts are respectively fixedly arranged on two side surfaces and near the ends of the horizontal base plate (05), the two shafts (131) are each provided with a pin wheel (132) connected by a pin key, the two pin wheels (132) are coaxially connected to a belt transmission component (133) on the side close to the vehicle frame, the mounting shafts (33a) of the pulleys at the other ends of the two belt transmission components (133) are each extended to mount a gear (134), and the two gears are meshed; the hoop roll (11) is mounted between the gear (134) and the coaxial pulley in the belt transmission component (133).

4. The two-wheeled cart according to claim 3, It is characterized in that The structure of the needle wheel (132) is composed of three ring layers when viewed from the side away from the frame. The three ring layers are a planar combined, integrated structure on the side of the frame. The outer ring layer and the middle layer have needle holes with a circumferential array spacing that is consistent with the spacing of the hoop holes. A needle tooth (1a) is slidably installed in each needle hole. Both ends of the needle tooth (1a) are rounded. A spring assembly (1b) is provided in the gap between the outer ring layer and the middle layer.

5. The two-wheeled cart according to claim 1, It is characterized in that The power mechanism (12) comprises a drive motor 121 drivingly connected to one of the shafts.

6. The two-wheeled cart according to claim 3, It is characterized in that The clutch switching mechanism (14) comprises two clutch plates (141) movably mounted on two shafts (131) and located on a side away from the vehicle frame, a switching rod (142) with each end passing through one of the clutch plates (141) from the side and hinged on the horizontal bottom plate (05), a handle (143) fixedly connected to the middle part of the switching rod (142) and extending downward, a buckling portion (144) fixed to the handle (143) and used to limit the downward pressing or upward lifting stroke of the handle (143), and a joint portion (145) fixed to the shaft matching component and cooperating with the buckling portion (144) to complete locking.

7. The two-wheeled cart according to claim 6, It is characterized in that The end of the clutch disc (141) with the largest diameter is a conical surface (1c), which contacts the needle teeth (1a). The clutch disc (141) has through holes 1d on both sides of the axis for the switch rod (142) to pass through.

8. The two-wheeled cart according to claim 3, It is characterized in that The lower transmission mechanism (24) comprises a transmission screw (241) sleeved on one mounting shaft (33a), a stabilizing light rod (242) sleeved on another mounting shaft (33a), and a limit seat (243) fixed on the frame for rotatably mounting the transmission screw (241) and the stabilizing light rod (242); the transmission screw (241) has a first spline head (41a) at one end facing upward after installation, and a second spline head (41b) of the same specification is arranged on the corresponding mounting shaft (33a); the lower transmission mechanism (24) further comprises a spline sleeve (244) sleeved outside the two spline heads, and a spring seat (245) having one end fixed on the limit seat (243) and the other end pressed against the spline sleeve (244).

9. The two-wheeled cart according to claim 8, It is characterized in that One end of the spline sleeve (244) away from the spring seat (245) is arranged to be an arc surface, and a push block (44a) extending toward one side of the arc surface is fixedly arranged on the handle (143), and the push block (44a) has an inclined surface, which contacts the arc surface of the spline sleeve (244), and a positioning pin (06) that can be adjusted in multiple stages is arranged on the outer side of the hinge between the support arm (22) and the slide seat (21).

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