Adjusting method for variable length and wheel tread of tractor

Abstract

The invention relates to a method for adjusting variable length and wheel track of a tractor, belongs to the field of individual load transportation, and solves the problem of poor overall stability of an existing tractor. The method comprises the following steps that S1, the wheel track of the tractor is adjusted; s2, the folding angle of the folding bearing unit is adjusted; and S3, the overall length of the tractor is adjusted. The tractor is suitable for different terrains and different heights of operators, the whole vehicle stability and the man-machine comfort level of the tractor are improved, meanwhile, the universality of the tractor is improved, and the application range and scene of the tractor are widened.

Description

Technical Field

[0001] The invention relates to the field of individual load transportation, and in particular to a method for adjusting the variable length and wheelbase of a tractor. Background Art

[0002] At present, in the field of forest fire fighting and related logistics support, the individual equipment carried by individual operators when performing field tasks is becoming increasingly complex, diverse and heavy. At present, manual handling, individual exoskeletons, power-assisted tractors and all-terrain unmanned vehicles are mainly used. Power-assisted tractors have been proposed and gradually applied in recent years. At present, most power-assisted tractors are two-wheeled. The two-wheeled power-assisted tractor is hung on the waist of the personnel, carrying certain individual equipment (such as fire rescue equipment, rescue materials, etc.), and adopts automatic or manual control methods to provide assistance to individual personnel and reduce the workload of personnel.

[0003] However, the current two-wheeled single-soldier assisted tractors have poor adaptability to the height of the wearer because the length of the whole machine cannot be adjusted. If the length of the whole vehicle is too small, it will cause excessive force on the shoulders of the wearer or the whole vehicle will overturn longitudinally. If the length of the whole vehicle is too large, the volume of the tractor will be too large, and the transportation and portability will be poor. On the other hand, the wheelbase of the tractor cannot be adjusted at this stage, resulting in poor terrain adaptability and passability of the tractor. If the wheelbase is too large, the tractor cannot pass through narrow space terrain, such as mountain forests and narrow passages. If the wheelbase is too small, the lateral stability of the whole vehicle is poor, and it is more likely to roll over. The above two defects have caused the stability of the tractor to deteriorate. Summary of the invention

[0004] In view of the above analysis, the present invention aims to provide a method for adjusting the variable length and wheelbase of a tractor, so as to solve the problem of poor overall stability of the existing tractor.

[0005] The purpose of the present invention is mainly achieved through the following technical solutions:

[0006] A method for adjusting the variable length and wheelbase of a tractor comprises the following steps:

[0007] Step S1: adjusting the wheelbase of the tractor;

[0008] Step S2: adjusting the folding angle of the folding carrying unit;

[0009] Step S3: adjusting the overall length of the tractor.

[0010] Furthermore, the method further includes: step S4: connecting the tractor to the operator; and step S5: powering on the tractor and assisting the operator.

[0011] Furthermore, the step S1 further comprises: adjusting the distance between two wheels in the adjustable wheelbase chassis unit according to the weight and volume of the load and the terrain, so that the wheelbase of the tractor is adjusted to a desired distance.

[0012] Furthermore, the step S3 also includes: adjusting the effective load-bearing length of the upper load-bearing mechanism in the folding load-bearing unit according to the weight and volume of the load and the height of the operator, thereby adjusting the overall length of the tractor.

[0013] Furthermore, the step S3 further includes: releasing the clamping of the upper load-bearing connecting pipe by means of a locking device, and adjusting the length of the upper load-bearing connecting pipe inserted into the locking sleeve.

[0014] Furthermore, the step S3 further comprises: after adjusting the effective load-bearing length of the upper load-bearing connecting pipe to a desired position, the upper load-bearing connecting pipe is clamped and fixed by a locking device.

[0015] Furthermore, the step S4 also includes: connecting or disconnecting the tractor to or from the wearable backboard on the waist of the operator through a plug-in / plug-out mechanism in the connecting / unplugging unit.

[0016] Furthermore, the step S5 also includes: after the tractor is connected to the operator, the operator powers on the tractor through a handheld control terminal, and controls the tractor's power assistance and accompanying protection for the operator.

[0017] Furthermore, the step S5 also includes: the force sensor in the sensing assembly obtains the magnitude of the traction force between the operator and the tractor, and feeds it back to the controller in the electronic control cabin, and the controller drives and controls the drive motor according to the received data.

[0018] Furthermore, the step S5 also includes: the angle sensor in the sensor assembly acquires the relative angle between the operator and the tractor, and feeds it back to the controller in the control cabin, and the controller implements differential steering control on the tractor according to the received data.

[0019] The technical solution of the present invention can achieve at least one of the following effects:

[0020] (1) The present invention provides a method for adjusting the variable length and wheelbase of a tractor, comprising the following steps: step S1: adjusting the wheelbase of the tractor; step S2: adjusting the folding angle of a folding load-bearing unit; step S3: adjusting the overall length of the tractor; the present invention enables the tractor to be suitable for different terrains and different heights of operators, improves the overall stability of the tractor and the comfort of the operator, and also improves the versatility of the tractor, thereby broadening the application scope and scenarios of the tractor.

[0021] (2) The present invention provides a method for adjusting the variable length and wheelbase of a tractor. According to the weight and volume of the load and the terrain on which the tractor is to be transported, the distance between the two wheels in the adjustable wheelbase chassis unit is adjusted so that the wheelbase of the tractor is adjusted to a desired distance, thereby improving the stability of the movement of the tractor and the terrain adaptability, and improving the versatility of the tractor, broadening the application scope and scenarios of the tractor, and also improving the load capacity of the tractor.

[0022] (3) The present invention provides a method for adjusting the variable length and wheelbase of a tractor. The rotating shaft in the folding mechanism is rotated to synchronously unlock or lock the angle adjustment mechanism and the cable retracting mechanism, so that the folding mechanism can be folded and locked at any position within a limited angle. The folding mechanism retracts and releases the cables while adjusting the angle, so that the cables are always at the required length, avoiding the clutter of cables of excess length in the folding mechanism, preventing the cables of excess length from getting stuck in the rotating shaft and affecting the rotation, or preventing the cables from being cut by the rotating shaft when folding or unfolding, thereby avoiding affecting the folding or unfolding movement of the tractor.

[0023] (4) The present invention provides a method for adjusting the variable length and wheelbase of a tractor. According to the weight and volume of the load and the height of the operator, the effective load-bearing length of the upper load-bearing mechanism in the folding load-bearing unit is adjusted, thereby adjusting the overall length of the tractor, so that the tractor is suitable for operators of different heights, improving the overall stability of the tractor and the comfort of the operator, and also improving the versatility of the tractor.

[0024] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0026] Figure 1 This is a flow chart of the adjustment method of the tractor in Embodiment 1 of the present invention;

[0027] Figure 2 The structure of the tractor in the second embodiment of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 3 The structure of the tractor in the second embodiment of the present invention is shown in FIG. Figure 2;

[0029] Figure 4 This is a schematic structural diagram of an adjustable wheelbase chassis unit in Embodiment 2 of the present invention;

[0030] Figure 5 for Figure 4 Sectional view along the midline BB;

[0031] Figure 6 for Figure 5 Middle C is a partial enlarged view;

[0032] Figure 7 The structure of the folding mechanism in Example 2 of the present invention is shown in FIG. Figure 1 ;

[0033] Figure 8 The structure of the folding mechanism in Example 2 of the present invention is shown in FIG. Figure 2 ;

[0034] Fig. 9 This is a schematic diagram of the structure of the rotating shaft in Embodiment 2 of the present invention;

[0035] Fig.10 The structure of the angle adjustment mechanism in Example 2 of the present invention is shown in FIG. Figure 1 ;

[0036] Fig.11 The structure of the angle adjustment mechanism in Example 2 of the present invention is shown in FIG. Figure 2 ;

[0037] Fig.12 for Fig.11 Mid-DD line section view;

[0038] Fig.13 An exploded view of the angle adjustment mechanism in Embodiment 2 of the present invention;

[0039] Fig.14 It is a schematic diagram of the structure of the fixed cylinder in Example 2 of the present invention;

[0040] Fig.15 Schematic diagram of the structure of the angle adjustment plate in Embodiment 2 of the present invention;

[0041] Fig.16 Schematic diagram of the structure of the locking plate in Embodiment 2 of the present invention;

[0042] Fig.17 The structure of the cable retracting mechanism in Embodiment 2 of the present invention is shown in FIG. Figure 1 ;

[0043] Fig.18 The structure of the cable retracting mechanism in Embodiment 2 of the present invention is shown in FIG. Figure 2 ;

[0044] Fig.19 The structure of the cable retracting mechanism in Embodiment 2 of the present invention is shown in FIG. Figure 3 ;

[0045] Fig. 20 It is a structural schematic diagram of the lower bearing mechanism in Embodiment 2 of the present invention;

[0046] Fig.21 for Figure 3 Middle A is a partial enlarged view;

[0047] Fig. 22 This is a schematic diagram of the structure of the locking sleeve in Example 2 of the present invention.

[0048] Reference numerals:

[0049] 1-Adjustable wheelbase chassis unit;

[0050] 11-beam; 111-beam body; 1111-cavity; 112-adjustment button; 1121-cylindrical protrusion; 113-fixing pin; 114-compression spring; 115-cover;

[0051] 12- shock absorbing mechanism; 121- adjusting beam; 1211- cylindrical cavity; 1212- locking hole; 122- bearing; 123- connecting shaft; 124- leaf spring; 125- bearing retaining ring;

[0052] 13-walking mechanism; 131-wheel; 132-drive motor; 133-connecting arm;

[0053] 14-Electronic control cabin;

[0054] 2-Folding carrying unit;

[0055] 21-folding mechanism; 211-housing; 2111-lower plate; 2112-housing; 21121-long slot hole; 212-handle; 213-rotating shaft; 2131-pushing column; 214-angle adjustment mechanism; 2141-fixing cylinder; 21411-first shaft hole; 21412-guide groove; 2142-angle adjustment disk; 21421-first gear tooth; 21422-second shaft hole; 2143-first return spring; 214 4-locking plate; 21441-locking plate body; 21442-second gear teeth; 21443-third shaft hole; 21444-guide block; 21445-spiral slide groove; 2145-rotating sleeve; 2146-compression spring; 215-cable retracting and releasing mechanism; 2151-turntable; 2152-swing rod; 2153-connecting rod; 2154-chuck; 2155-ratchet; 2156-retracting column; 2157-second return spring;

[0056] 22-lower bearing mechanism; 221-lower bearing connecting pipe;

[0057] 23-upper bearing mechanism; 231-fixed seat; 232-upper bearing connecting pipe; 233-U-shaped plate; 234-locking sleeve; 2341-strip notch; 235-locking device;

[0058] 3- plug and unplug connection unit;

[0059] 31-plug-in and plug-out mechanism; 311-plug; 312-connection socket;

[0060] 32-Sensor component. DETAILED DESCRIPTION

[0061] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0062] Example 1

[0063] A specific embodiment of the present invention discloses a method for adjusting the variable length and wheelbase of a tractor, such as Figure 1 As shown, the following steps are included:

[0064] Step S1: adjusting the wheelbase of the tractor;

[0065] Specifically, according to the weight and volume of the load and the terrain adjustment that the tractor is going to transport, the distance between the two wheels 131 in the adjustable wheelbase chassis unit 1 is adjusted, so that the wheelbase of the tractor is adjusted to the required distance, thereby improving the stability and terrain adaptability of the tractor, improving the versatility of the tractor, broadening the application scope and scenarios of the tractor, and also improving the load capacity of the tractor;

[0066] Further, the adjustment buttons 112 installed at both ends of the beam body 111 are respectively pressed to adjust the relative position of the adjustment beams 121 provided at both ends of the beam body 111 and the beam body 111, thereby adjusting the wheelbase of the wheels 131 on both sides of the tractor;

[0067] Further, the pressing end of the adjusting button 112 in the crossbeam 11 is pressed, so that the cylindrical protrusion 1121 on the pressing end of the adjusting button 112 is disengaged from the locking hole 1212 on the adjusting beam 121 in the shock absorbing mechanism 12, thereby releasing the locking of the adjusting beam 121 and the crossbeam body 111; then, the relative position of the adjusting beam 121 in the crossbeam body 111 is adjusted, so that the adjusting beam 121 extends out or retracts into the end of the crossbeam body 111 to a proper position; then, the pressing end of the adjusting button 112 in the crossbeam 11 is released, so that the cylindrical protrusion 1121 on the pressing end of the adjusting button 112 is pressed tightly into another locking hole 1212 on the adjusting beam 121 in the shock absorbing mechanism 12 under the elastic action of the compression spring 144, thereby locking the adjusting beam 121 and the crossbeam body 111, so that the adjusting beam 121 is fixed at different positions of the crossbeam body 111, thereby realizing the adjustment of the wheelbase of the wheels 131 on both sides of the tractor;

[0068] Step S2: adjusting the folding angle of the folding carrying unit 2;

[0069] Specifically, the rotating shaft 213 in the folding mechanism 21 is rotated to synchronously unlock or lock the angle adjustment mechanism 214 and the cable retracting mechanism 215, so that the folding mechanism 21 is folded and locked at any position within a limited angle; while adjusting the angle, the folding mechanism 21 retracts and releases the cables, so that the cables are always at the required length, avoiding the messy accumulation of cables of excess length in the folding mechanism 21, preventing the cables of excess length from getting stuck in the rotating shaft and affecting the rotation or being broken by the rotating shaft during folding or unfolding, thereby avoiding affecting the folding or unfolding movement of the tractor; specifically, the following steps are included:

[0070] Step S201: unlocking the folding mechanism 21;

[0071] The handle 212 is moved to drive the rotating shaft 213 to rotate, so that the angle adjustment mechanism 214 and the cable retracting mechanism 215 are unlocked at the same time, thereby unlocking the folding mechanism 21;

[0072] Furthermore, the handle 212 is moved to rotate the shaft 213, so that the push column 2131 on the shaft 213 slides in the spiral groove 21445 of the locking plate 2144, thereby driving the locking plate 2144 to slide in the direction away from the angle adjustment plate 2142, so that the second gear teeth 21442 on the locking plate 2144 are separated from the first gear teeth 21421 on the angle adjustment plate 2142; when the shaft 213 is rotated 90°, the second gear teeth 21442 on the locking plate 2144 are completely separated from the first gear teeth 21421 on the angle adjustment plate 2142, that is, the locking plate 2144 releases the lock on the angle adjustment plate 2142. , realizing unlocking of the angle adjustment mechanism 214; at the same time, the rotating shaft 2123 rotates to drive the rotating disk 2151 to rotate, and drives the swing rod 2152 to move, so that the swing rod 2152 drives the connecting rod 2153 to rotate with the pin shaft set in the middle of the connecting rod 2153 as the fulcrum, and then drives the chuck 2154 to rotate with the pin shaft connected to the fixed cylinder 2141 as the fulcrum, so that the ratchet set on the chuck 2154 is separated from the ratchet 2155; when the rotating shaft 213 rotates 90°, the ratchet on the chuck 2154 is completely separated from the ratchet 2155, that is, the chuck 2154 releases the lock on the ratchet 2155, realizing unlocking of the cable retracting mechanism 215;

[0073] Step S202: adjusting the folding angle of the folding mechanism 21 and retracting and releasing the cables at the same time;

[0074] After the locking state is released, the folding angle of the folding mechanism 21 is adjusted within a limited angle, that is, the angle between the lower bearing mechanism 22 and the upper bearing mechanism 23 in the tractor is adjusted, thereby adjusting the center position of the tractor, reducing the pressure of the tractor on the shoulders of the human body, and improving the stability of the movement of the tractor; at the same time, the folding mechanism 21 is used to adjust the angle while retracting and releasing the cables of the tractor, so that the cables are always at the required length, avoiding the messy accumulation of cables of excess length in the folding mechanism 21, and preventing the cables of excess length from getting stuck on the rotating shaft when the angle between the lower bearing mechanism 22 and the upper bearing mechanism 23 of the tractor is adjusted, thereby avoiding affecting the folding or unfolding movement of the tractor;

[0075] Furthermore, when the folding mechanism 21 is unfolded, the tractor is adjusted to the desired unfolding angle; at the same time, during the unfolding process, the cable wound and stored on the take-up column 2156 is stretched, thereby driving the take-up column 2156 disposed on the ratchet 2155 to rotate, releasing the cable, and adjusting the cable to the desired length without causing the excess length of the cable to hinder the unfolding movement of the folding mechanism; in addition, the rotation of the take-up column 2156 simultaneously drives the ratchet 2155 to rotate, causing the second return spring 2157 to deform and store the return elastic potential energy, that is, the second return spring 2157 will continue to apply a return elastic force to the ratchet 2155 after deformation;

[0076] Furthermore, when the folding mechanism 21 is folded, the tractor is adjusted to a desired folding angle; at the same time, the cable will be loosened during the folding process, and the ratchet 2155 will rotate in the opposite direction under the action of the resetting elastic force of the second resetting spring 2157, thereby driving the take-up post 2156 disposed on the ratchet 2155 to rotate in the opposite direction, and then the loosened cable is wound and stored on the take-up post 2156, which can prevent the excess length of the cable from being randomly accumulated in the housing 211 and affecting the folding movement of the folding mechanism;

[0077] Compared with the prior art, when the folding mechanism 21 is folded or unfolded, the wire wheel take-up mechanism 215 can retract and release the wires, so that the wires are always at the required length, and the wires with excess lengths are prevented from being piled up in the folding mechanism, and the wires with excess lengths are prevented from being stuck on the shaft and affecting the rotation or being broken by the shaft when folding or unfolding, thereby avoiding affecting the folding or unfolding movement of the equipment;

[0078] Step S203: locking the folding mechanism 21;

[0079] After the folding mechanism 21 is unfolded or folded into place, the torsion of the handle 212 is released, and the handle 212 drives the rotating shaft 213 to rotate in the opposite direction under the action of the return elastic force of the first return spring 2143 in the angle adjustment mechanism 214, so that the angle adjustment mechanism 214 and the cable retracting mechanism 215 are locked at the same time, thereby realizing the locking of the folding mechanism;

[0080] Further, after the handle 212 is released, the handle 212 drives the rotating shaft 213 to rotate in the opposite direction under the action of the return elastic force of the first return spring 2143 in the angle adjustment mechanism 214, so that the pushing column 2131 on the rotating shaft 213 slides in the spiral groove 21445 of the locking plate 2144, and then drives the locking plate 2144 to slide in the direction close to the angle adjustment plate 2142, so that the second gear teeth 21442 on the locking plate 2144 mesh with the first gear teeth 21421 on the angle adjustment plate 2142; when the rotating shaft 213 rotates in the opposite direction by 90°, the second gear teeth 21442 on the locking plate 2144 are fully meshed with the first gear teeth 21421 on the angle adjustment plate 2142, that is, the locking plate 2144 locks the angle adjustment plate 2142, and the angle adjustment mechanism 214 is locked;

[0081] At the same time, the shaft 2123 rotates in the opposite direction and drives the turntable 2151 to rotate in the opposite direction, and drives the swing rod 2152 to move, so that the swing rod 2152 drives the connecting rod 2153 to rotate in the opposite direction with the pin shaft set in the middle of the connecting rod 2153 as the fulcrum, and then drives the chuck 2154 to rotate in the opposite direction with the pin shaft connected to the fixed cylinder 2141 as the fulcrum, so that the ratchet set on the chuck 2154 is engaged with the ratchet 2155; when the shaft 213 rotates in the opposite direction by 90°, the ratchet on the chuck 2154 is fully engaged with the ratchet 2155, that is, the chuck 2154 locks the ratchet 2155, so that the cable retracting mechanism 215 is locked;

[0082] Furthermore, when the angle adjustment mechanism 214 is locked, the second gear teeth 21442 and the first gear teeth 21421 are further pressed against each other by the elastic force of the pressing spring 2145, so that the second gear teeth 21442 and the first gear teeth 21421 are prevented from loosening when in meshing state, making the locking of the angle adjustment mechanism 214 more reliable.

[0083] Step S3: adjusting the overall length of the tractor;

[0084] Specifically, according to the weight and volume of the load and the height of the operator, the effective load-bearing length of the upper load-bearing mechanism 23 in the folding load-bearing unit 2 is adjusted, and then the overall length of the tractor is adjusted, so that the tractor is suitable for operators of different heights, the vehicle stability and human-machine comfort of the tractor are improved, and the versatility of the tractor vehicle is also improved;

[0085] Furthermore, the clamping of the upper load-bearing connecting tube 232 is released by the locking device 235, and the length of the upper load-bearing connecting tube 232 inserted into the locking sleeve 234 is adjusted. After the effective load-bearing length of the upper load-bearing connecting tube 232 is adjusted to an appropriate position, the upper load-bearing connecting tube 232 is clamped and fixed by the locking device 235, so that the effective load-bearing length of the upper load-bearing connecting tube 232 can be adjusted according to the height of the operator, thereby achieving the overall length of the tractor being adjustable, so that the tractor can be used by operators of different heights, and the overall stability of the tractor is improved;

[0086] Step S4: connecting the tractor to the operator;

[0087] Specifically, the tractor is quickly connected or disconnected with the wearable backboard on the waist of the operator by connecting and disconnecting the plug-in and plug-out mechanism 31 in the plug-in and plug-out unit 3, so that the operator and the tractor can be quickly connected and disconnected conveniently and quickly;

[0088] Furthermore, the plug 31 of the plug-in / disconnection mechanism 31 is plugged in and out of the wearable back plate on the waist of the operator, thereby realizing the quick plug-in / disconnection locking between the tractor and the wearable back plate on the waist of the operator, which facilitates the operator to quickly connect and disconnect with the tractor;

[0089] Step S5: the tractor is powered on and assists the operator;

[0090] Specifically, after the tractor is connected to the operator, the operator powers on the tractor through a handheld control terminal and drives the load to move;

[0091] Furthermore, during the walking process, the traction force of the tractor applied by the operator is used as the system control input, and the force sensor in the sensor assembly 32 obtains the magnitude of the traction force between the operator and the tractor, and feeds it back to the controller in the electronic control cabin 14, and the controller drives and controls the drive motor 132 according to the received data; at the same time, the angle sensor in the sensor assembly 32 obtains the relative turning angle between the operator and the tractor, and feeds it back to the controller in the control cabin 14, and the controller implements differential steering control of the tractor according to the received data, thereby achieving the tractor assist and accompanying protection for the operator.

[0092] Example 2

[0093] In another specific embodiment of the present invention, a tractor for use in embodiment 1 is disclosed, such as Figure 2 As shown, it includes an adjustable wheelbase chassis unit 1, a folding carrying unit 2 and a plug-and-disconnect connection unit 3, wherein the adjustable wheelbase chassis unit 1 is connected to the folding carrying unit 2, the folding carrying unit 2 is connected to the plug-and-disconnect connection unit 3, and the plug-and-disconnect connection unit 3 is connected to the operator, thereby realizing the assistance of the tractor and the accompanying protection of the operator; compared with the existing tractors, the wheelbase of the tractor is adjusted according to the terrain through the adjustable wheelbase chassis unit 1, and the whole vehicle length of the tractor can be adjusted according to the height of the operator through the folding carrying unit 2, thereby realizing the tractor is suitable for different terrains and different heights of operators, thereby improving the whole vehicle stability and human-machine comfort of the tractor, and improving the versatility of the tractor, broadening the application scope and scenarios of the tractor.

[0094] Preferably, if Figure 3As shown, the plug-in / disconnection connection unit 3 includes a plug-in / disconnection mechanism 31 and a sensor component 32. The sensor component 32 is arranged on the plug-in / disconnection mechanism 31, and the sensor component 32 is used to detect the traction force of the operator on the tractor and detect the relative turning angle between the operator and the tractor; one end of the plug-in / disconnection mechanism 31 is connected to the wearable backboard on the operator's waist, and the other end is connected to the folding carrying unit 2, so that the tractor is connected to the operator, realizing the assistance of the tractor and the accompanying protection of the operator.

[0095] Preferably, the plug-in / disconnection mechanism 31 includes a plug 311 and a connecting seat 312, the plug 311 is arranged on the connecting seat 312, and the connecting seat 312 is fixedly connected to the folding carrying unit 2; the plug 311 is plugged and unplugged with the wearable back panel on the waist of the operator, so as to realize the quick plug-in / unplug-locking of the wearable back panel on the waist of the operator, which is convenient for the operator to quickly connect and disconnect with the tractor; the sensor component 32 is arranged on the connecting seat 312, and the sensor component 32 includes a force sensor and an angle sensor, and the force sensor and the angle sensor are any one of the sensors in the prior art.

[0096] Preferably, the adjustable wheelbase chassis unit 1 includes a crossbeam 11, a shock absorbing mechanism 12, a traveling mechanism 13 and an electric control cabin 14. The electric control cabin 14 is fixedly mounted on the crossbeam 11 and can be used as a load-bearing tray for carrying loads. Two sets of the shock absorbing mechanism 12 and the traveling mechanism 13 are respectively arranged. The two sets of the traveling mechanisms 13 are respectively mounted on the two sets of the shock absorbing mechanisms 12. The two sets of the shock absorbing mechanisms 12 are symmetrically mounted at both ends of the crossbeam 11. The shock absorbing mechanism 12 can also move along the length direction of the crossbeam 11, so that the wheelbase of the wheels on both sides of the tractor can be adjusted according to the terrain conditions, thereby improving the stability and terrain adaptability of the tractor, and at the same time improving the versatility of the tractor, expanding the scope and scenarios of application.

[0097] Preferably, if Figure 4 As shown, the crossbeam 11 includes a crossbeam body 111 and an adjustment component. Two sets of the adjustment components are provided and are symmetrically installed at both ends of the crossbeam body 111. The adjustment components are used to adjust the length of the shock absorbing mechanism 12 extending out of the crossbeam body 111, thereby adjusting the wheelbase of the tractor.

[0098] Preferably, if Figure 5 and Figure 6As shown, the crossbeam body 111 has a top plate and two side plates arranged on both sides of the top plate, and the top plate and the two side plates enclose a square groove with one side open, and the square groove is used to install the shock absorbing mechanism 12; two cavities are provided at both ends of the top plate of the crossbeam body 111, and the two cavities are respectively used to install two sets of adjustment components; this embodiment takes one set of adjustment components as an example for specific description, and the adjustment component includes an adjustment button 112, a fixed pin shaft 113, and a compression spring 114, and the adjustment button 112 is mounted on the two side plates of the crossbeam body 111 through the fixed pin shaft 113. Thereby, the adjustment button 112 is hinged to the beam body 111, and the adjustment button 112 can rotate at the fulcrum of the fixed pin shaft 113; the adjustment button 112 has a pressing end and a locking end, and the pressing end is arranged in the cavity 1111 of the beam body 111; one side of the locking end is fixedly connected to one end of the compression spring 114, and the other end of the compression spring 144 is fixedly connected to the top plate of the beam body 111, and the compression spring 114 is in a compressed state, and always applies a downward elastic force to the locking end of the adjustment button 112; the other side of the locking end is provided with a cylindrical protrusion 1121.

[0099] Preferably, the crossbeam 11 further comprises a cover 115 , which is fixedly mounted on the opening of the square groove of the crossbeam body 111 and can be used to prevent external foreign matter from entering the square groove, thereby protecting the structure installed in the square groove.

[0100] Preferably, the shock absorbing mechanism 12 is provided with two sets, which are symmetrically installed in the square groove of the beam body 111 and can move along the length direction of the square groove; this embodiment is specifically described by taking one of the shock absorbing mechanisms 12 as an example, and the shock absorbing mechanism 12 includes an adjusting beam 121, a bearing 122, a connecting shaft 123 and a leaf spring 124, the adjusting beam 121 is square, and the adjusting beam 121 is installed in the square groove of the beam body 111, and the cross-sectional dimension of the adjusting beam 121 is smaller than the cross-sectional dimension of the square groove of the beam body 111, so that the adjusting beam 121 and the square groove of the beam body 111 are clearance-matched, so that the adjusting beam 121 can move in the square groove along its length direction; the adjusting beam 121 is provided with a cylindrical cavity 1211 along its axis, one end of the cylindrical cavity 1211 is open, and the other end is closed, The bearing 122 is fixedly mounted on the open end of the cylindrical cavity 1211, and the connecting shaft 123 is passed through the bearing 122, so that the connecting shaft 123 and the adjusting beam 121 can rotate relative to each other; one end of the connecting shaft 123 is connected to the walking mechanism 13, and the other end is fixedly connected to one end of the leaf spring 124, and the other end of the leaf spring 124 is fixedly connected to the closed end of the cylindrical cavity 1211. When the connecting shaft 123 and the adjusting beam 121 rotate relative to each other, the leaf spring 124 can be used to provide a rotation damping force; when the tractor encounters a convex or concave obstacle on the road surface, the shock absorbing mechanism 12 is used for shock absorption to improve the stability of the tractor's movement; compared with the existing air suspension shock absorption or hydraulic shock absorption structure, the shock absorption mechanism 12 in this embodiment has the advantages of simple and reliable structure, easy use and low cost.

[0101] Preferably, the adjusting beam 121 is further provided with a locking hole 1212, and a plurality of the locking holes 1212 are provided and are arranged at equal intervals on the upper wall surface of the adjusting beam 121, and are arranged corresponding to the adjusting components in the crossbeam 11; the locking hole 1212 is used to insert the cylindrical protrusion 1121 on the adjusting button 112 in the crossbeam 11, and the cylindrical protrusion 1121 forms a positioning match with the locking hole 1212, and the cylindrical protrusion 1121 is pressed tightly into the locking hole 1212 under the elastic action of the compression spring 114, so that the relative position of the adjusting beam 121 and the crossbeam body 111 is locked; by pressing the pressing end in the adjusting button 112, the cylindrical protrusion 1121 at the locking end in the pressing adjusting button 112 can be disengaged from the locking hole 1212, thereby releasing the adjusting beam 1 21 is locked with the beam body 111, and after adjusting the length of the adjusting beam 121 extending out of the beam body 111, the pressing end is released to press the cylindrical protrusion 1121 into different locking holes 1212, so that the adjusting beam 121 is fixed at different positions of the beam body 111, thereby adjusting the wheelbase of the wheels on both sides; compared with the prior art, this embodiment cooperates with the locking holes 1212 equidistantly arranged on the adjusting beam 121 through the adjusting component, so that the adjusting beam 121 and the beam body 111 can be quickly locked or released, and the structure is simple, and the operation is convenient and fast, and the different positions of the adjusting beam 121 on the beam body 111 can be quickly adjusted, thereby adjusting the wheelbase of the wheels on both sides of the tractor according to the terrain conditions, so as to improve the stability and terrain adaptability of the tractor.

[0102] Preferably, the buffer shock absorbing mechanism 12 further includes a bearing retaining ring 125 , which is fixedly mounted in the cylindrical cavity 1211 and connected to the inner side of the bearing 122 for limiting the axial movement of the bearing 122 , thereby limiting the axial movement of the connecting shaft 123 .

[0103] Preferably, the bearing 122 is an angular contact ball bearing.

[0104] Preferably, two sets of the walking mechanism 13 are provided, and the two sets of the walking mechanism 13 are respectively installed on two sets of shock absorbing mechanisms 12, and the walking mechanism 13 provides power assistance for the tractor; this embodiment takes one of the walking mechanisms 13 as an example for specific description, and the walking mechanism 13 includes a wheel 131, a drive motor 132 and a connecting arm 133, one end of the connecting arm 133 is fixedly connected to the connecting shaft 123 in the shock absorbing mechanism 12, and the other end is connected to the drive motor 132, and the wheel 131 is installed on the drive motor 132, and the drive motor 132 is used to drive the wheel 131 to rotate, thereby realizing the power assistance of the tractor and the accompanying protection of the operating personnel.

[0105] Preferably, the electric control cabin 14 includes a power supply and a controller, the power supply is used to provide power for the drive motor 132; the controller is used to receive the change of force between the operator and the tractor sensed by the sensor component 32, and control the rotation of the drive motor 132 according to the information fed back by the sensor component 32, that is, the controller receives the data of the magnitude of the traction force read by the force sensor in the sensor component 32, and the controller drives and controls the drive motor 132 according to the received data; at the same time, the controller receives the data of the relative angle between the operator and the tractor read by the angle sensor in the sensor component 32, and the controller implements differential steering control of the tractor according to the received data, thereby realizing the power assistance of the tractor and the accompanying protection of the operator.

[0106] Preferably, the folding carrying unit 2 includes a folding mechanism 21, a lower carrying mechanism 22 and an upper carrying mechanism 23, one end of the lower carrying mechanism 22 is fixedly connected to the beam body 111 in the beam 11, and the other end is fixedly connected to the folding mechanism 21; one end of the upper carrying mechanism 23 is rotatably connected to the folding mechanism 21, and the other end is fixedly connected to the connecting seat 312 in the plug-in and unplugging mechanism 31; the folding mechanism 21 can be folded and locked at any position within a limited angle, so as to adjust the angle between the lower carrying mechanism 22 and the upper carrying mechanism 23, so as to adjust the center of gravity position of the tractor, and then adjust the pressure of the tractor on the shoulders of the human body, thereby improving the human-machine comfort; the upper carrying mechanism 23 can also adjust its effective carrying length, so as to adjust the length of the tractor as a whole, so that the tractor is suitable for operators of different heights, and at the same time improves the stability of the tractor as a whole, and further improves the versatility of the tractor.

[0107] Preferably, the folding mechanism 21 is rotatably mounted on the U-shaped plate 233 in the upper bearing mechanism 23, and the folding mechanism 21 can be folded and locked at any position within a limited angle; by adjusting the folding angle of the folding mechanism 21, the angle between the lower bearing mechanism 22 and the upper bearing mechanism 23 is adjusted, thereby adjusting the center position of the tractor, reducing the pressure of the tractor on the shoulders of the human body, and improving the stability of the movement of the tractor; in addition, the folding mechanism 21 can also retract and release the cables of the tractor while adjusting the angle, so that the cables are always at the required length, avoiding the messy accumulation of cables of excess length in the folding mechanism 21, preventing the cables of excess length from getting stuck in the rotating shaft when the tractor adjusts the angle between the lower bearing mechanism 22 and the upper bearing mechanism 23, affecting the rotation, or preventing the cables from being broken by the rotating shaft, thereby avoiding affecting the folding or unfolding movement of the tractor.

[0108] Preferably, if Figure 7 and Figure 8As shown, the folding mechanism 21 includes a shell 211, a rotating shaft 213, an angle adjustment mechanism 214 and a cable retracting mechanism 215. The shell 211 is fixedly connected to the lower bearing mechanism 22, and the upper bearing mechanism 23 is fixedly connected to the angle adjustment mechanism 214. The shell 211 is cylindrical, and the angle adjustment mechanism 214 is provided with two groups, which are symmetrically fixedly installed at both ends of the shell 211. The rotating shaft 213 is passed through the two groups of angle adjustment mechanisms 214 and is rotatably connected to the angle adjustment mechanisms 214. The cable retracting mechanism 215 is provided on the shell 211. 211, and is connected to the rotating shaft 213 at the same time; rotating the rotating shaft 213 can synchronously unlock or lock the angle adjustment mechanism 214 and the cable retracting mechanism 215, so that the folding mechanism 21 can be folded and locked at any position within a limited angle; while adjusting the angle, the folding mechanism 21 can also retract and release the cables, so that the cables are always at the required length, avoiding the messy accumulation of cables of excess length in the folding mechanism 21, preventing the cables of excess length from getting stuck in the rotating shaft and affecting the rotation or the cables from being cut by the rotating shaft when folding or unfolding, thereby avoiding affecting the folding or unfolding movement of the tractor.

[0109] Preferably, the folding mechanism also includes a handle 212, and two wrenches 212 are provided, which are respectively fixedly connected to the two ends of the rotating shaft 213. Turning the handle 212 drives the rotating shaft 213 to rotate, thereby driving the angle adjustment mechanism 214 and the cable retracting mechanism 215 to be unlocked or locked at the same time, thereby achieving the adjustment of the folding angle while retracting and releasing the cable.

[0110] Preferably, the shell 1 includes a lower plate 2111 and an outer shell 2112 fixedly mounted on the lower plate, and the lower plate 2111 is fixedly connected to an external lower supporting device; the outer shell 2112 is cylindrical and is used to protect other mechanisms and cables arranged in the outer shell 2112; the outer shell 2112 is provided with a long slot hole 21121, and the long slot hole 21121 extends along the circumferential direction of the outer shell 2112, and is used to introduce the excess length of the external cable into the shell 211.

[0111] Preferably, if Fig. 9 As shown, push columns 2131 are respectively provided at both ends of the rotating shaft 213; the rotating shaft 213 is preferably square. Compared with a cylindrical shaft, a square shaft can be better connected to other components to prevent slipping when the rotating shaft 213 drives its components to rotate, and can better transmit motion.

[0112] Preferably, if Fig.10 , Fig.11 , Fig.12 and Fig.13As shown, the angle adjustment mechanism 214 includes a fixed cylinder 2141, an angle adjustment disk 2142, a first return spring 2143, a locking disk 2144 and a rotating sleeve 2145. The locking disk 2144 and the angle adjustment disk 2142 are sequentially installed in the fixed cylinder 2141 and are both connected to the rotating shaft 213. The locking disk 214 can lock or unlock the angle adjustment disk 2142 according to the rotation of the rotating shaft 213; one end of the first return spring 2143 is fixedly connected to the rotating shaft 213, and the other end is fixedly connected to the closed end of the fixed cylinder 2141. The first return spring 2143 is used to When torque is added, the driving shaft 213 rotates and returns to its initial state, and at the same time pushes the locking plate 2144 to slide in the direction close to the angle adjustment plate 2142, so that the locking plate 2144 automatically locks the angle adjustment plate 2142; compared with the prior art, the angle adjustment mechanism 214 has a simple structure, and the locking plate 2144 can unlock the angle adjustment plate 2142 by rotating the shaft 213, and the locking plate 2144 can automatically lock the angle adjustment plate 2142 by the first return spring 2143. The operation is convenient, and the folding mechanism 21 can be folded and locked at any position within a limited angle.

[0113] Preferably, the fixing cylinder 2141 is fixedly mounted at the end of the shell 2112 in the housing 211; Fig.14 As shown, one end of the fixed cylinder 2141 is open and the other end is closed, forming an open end and a closed end; a first axial hole 21411 is provided on the closed end, and a rotating sleeve 2145 is installed in the first axial hole 21411, and the rotating sleeve 2145 is fixedly installed on the rotating shaft 213, so that the fixed cylinder 2141 is rotatably connected to the rotating shaft 213 through the rotating sleeve 2145; a guide groove 21412 is also provided on the inner wall of the fixed cylinder 2141 on one side close to the closed end, and the guide groove 21412 extends along the axial direction of the fixed cylinder 2141; in this embodiment, four guide grooves 21412 are preferably arranged, and the four guide grooves 21412 are evenly distributed along the circumference of the cylinder wall of the fixed cylinder 2141.

[0114] Preferably, the angle adjustment disk 2142 is rotatably mounted on the open end of the fixed cylinder 2141, and one end surface is fixedly connected to the upper bearing mechanism 23; Fig.15 As shown, a first gear tooth 21421 is provided on the other end face of the angle adjustment disk 2142; a second shaft hole 21422 is also provided on the angle adjustment disk 2142, and a rotating sleeve 2145 is installed in the second shaft hole 21422. The rotating sleeve 2145 is fixedly installed on the rotating shaft 213, so that the angle adjustment disk 2142 is rotatably connected to the rotating shaft 213 through the rotating sleeve 2145.

[0115] Preferably, the locking plate 2144 is slidably connected to the fixed cylinder 2141, and the locking plate 2144 can only slide along the axial direction of the fixed cylinder 2141; the locking plate 2144 is mounted on the rotating shaft 213 and is slidably connected to the rotating shaft 213. By rotating the rotating shaft 213, the locking plate 2144 can be pushed to slide along its axial direction in the fixed cylinder 2141, so that the locking plate 2144 can lock or unlock the angle adjustment plate 2142.

[0116] Preferably, if Fig.16 As shown, the locking plate 2144 includes a locking plate body 21441, a second gear tooth 21442, a third shaft hole 21443, a guide block 21444 and a spiral groove 21445. The second gear tooth 21442 is arranged on the end surface of the locking plate body 21441 and is correspondingly arranged with the first gear tooth 21421 in the angle adjustment plate 2142, and can be meshed with the first gear tooth 21421. Through the meshing and separation of the second gear tooth 21442 and the first gear tooth 21421, the locking plate 2144 can lock or unlock the angle adjustment plate 2142; the guide block 21444 is arranged at the edge of the locking plate body 21441 and extends outwardly along the diameter direction of the locking plate body 21441; the guide block 21444 is arranged corresponding to the guide groove 412 on the inner wall of the fixed cylinder 2141, and the guide block 21444 is arranged 1444 can slide in the guide groove 21412, and can be used to limit the circular rotation of the locking plate 2144, so that the locking plate 2144 can only slide in the axial direction of the fixed cylinder 2141; in this embodiment, four guide blocks 21444 are preferably provided, and the four guide blocks 21444 are evenly arranged in the circumferential direction of the edge of the locking plate body 21441, so that the four guide blocks 21444 correspond to the four guide grooves 21412 on the inner wall of the fixed cylinder 2141, so that the guide blocks 21444 can be inserted into the guide grooves 21412 and can slide in the guide grooves 21412; the four guide blocks 21444 cooperate with the four guide grooves 21412, so that the locking plate 2144 can be subjected to uniform force when sliding along the axial direction of the fixed cylinder 2141, thereby improving the smoothness of the sliding of the locking plate 2144 in the fixed cylinder 2141.

[0117] Preferably, the spiral groove 21445 is arranged on the inner wall of the third shaft hole 21443, and the spiral groove 21445 cooperates with the pushing column 2131 on the rotating shaft 213. The rotating shaft 213 is rotated to make the pushing column 2131 slide in the spiral groove 21445, thereby pushing the locking plate 2144 to slide along its axis in the fixed cylinder 2141, so that the second gear 21442 can engage or disengage with the first gear 21421, thereby realizing that the locking plate 2144 locks or unlocks the angle adjustment plate 2142; retaining rings are provided at both ends of the spiral groove 21445, and the retaining rings are used to limit the sliding stroke of the pushing column 2131 in the spiral groove 21445; the preferred rotation angle of the rotating shaft 213 in this embodiment is 90°, that is, when the rotating shaft 213 rotates 90°, the second gear teeth 21442 in the locking plate 2144 can be pushed to fully engage or disengage with the first gear teeth 21421; compared with the prior art, this embodiment cooperates with the pushing column 2131 on the rotating shaft 213 through the spiral groove 21445, and rotates the rotating shaft 213 to make the pushing column 2131 slide in the spiral groove 21445, thereby pushing the locking plate 2144 to slide along its axis in the fixed cylinder 2141, so that the second gear teeth 21442 can engage or disengage with the first gear teeth 21421, thereby realizing that the locking plate 2144 locks or unlocks the angle adjustment plate 2142. Its structure is simple and easy to operate, and the folding mechanism 21 can be quickly folded or unfolded.

[0118] Preferably, the angle adjustment mechanism 214 also includes a compression spring 2146, one end of the compression spring 2146 is fixedly connected to the closed end of the fixed cylinder 2141, and the other end is fixedly connected to the other end surface of the locking disk 2144. The compression spring 2146 is always in a compressed state, that is, the compression spring 2146 always applies an elastic force to the locking disk 2144, so that the second gear teeth 21442 in the locking disk 2144 and the first gear teeth 21421 in the angle adjustment disk 2142 are more tightly engaged, thereby preventing the second gear teeth 21442 from loosening when engaging with the first gear teeth 21421.

[0119] Preferably, the cross-sectional shape of the spiral groove 21445 is preferably semicircular; the end of the push column 2131 is preferably set to a hemispherical shape, so that the end of the push column 2131 can better fit with the spiral groove 21445, so that the push column 2131 can slide more smoothly in the spiral groove 445, and then the locking plate 2144 can be pushed more smoothly to slide along the axial direction of the fixed cylinder 2141 when the rotating shaft 213 rotates; in this embodiment, the spiral grooves 21445 are preferably provided with four, and the four spiral grooves 21445 are arranged along The inner wall of the third shaft hole 21443 is evenly distributed around the circumference; four pushing columns 2131 are provided on each end of the rotating shaft 213, and the four pushing columns 2131 are symmetrically arranged on the four faces of the rotating shaft 213, and are correspondingly arranged with the four spiral grooves 21445. The four pushing columns 2131 cooperate with the four spiral grooves 21445, so that the rotating shaft 213 can be subjected to uniform force when pushing the locking plate 2144 to slide along the axial direction of the fixed cylinder 2141, thereby improving the smoothness of the rotating shaft 213 pushing the locking plate 2144 to slide.

[0120] Preferably, if Fig.17 , Fig.18 and Fig.19 As shown, the cable retracting mechanism 215 includes a locking assembly, a ratchet 2155, a take-up post 2156 and a second return spring 2157. The locking assembly is used to lock or unlock the ratchet 2155 according to the rotation of the rotating shaft 213; the ratchet 2155 is rotatably mounted on the closed end of the fixed cylinder 2141 in the angle adjustment mechanism 214; the take-up post 2156 is fixedly mounted at the center of the end face of the ratchet 2155, and the take-up post 2156 is used to store or release the cable according to the rotation of the ratchet 2155; the second return spring 2157 is fixedly mounted on the other end face of the ratchet 2155, and one end of the second return spring 2157 is fixedly connected to the ratchet 2155 , and the other end is fixedly connected to the closed end of the fixed cylinder 2141. The second return spring 2157 is used to drive the ratchet 2155 to rotate, thereby driving the take-up column 2156 to rotate to realize automatic cable storage. Compared with the prior art, this embodiment is used to store and retract the excess length of the cable in the folding mechanism 21 by setting the cable retracting mechanism 215, so that the folding mechanism 21 can adjust the length of the cable while folding or unfolding, so that the cable is always at the required length, which can avoid the excess length of the cable from being piled up in the folding mechanism, and prevent the excess length of the cable from getting stuck in the rotating shaft and affecting the rotation or the cable from being broken by the rotating shaft when the tractor is folded or unfolded, thereby avoiding affecting the folding or unfolding movement of the tractor.

[0121] Preferably, the locking assembly includes a rotating disk 2151, a rocker arm 2152, a connecting rod 2153 and a chuck 2154. The rotating disk 2151 is sleeved on the rotating shaft 213 and is fixedly connected to the rotating shaft 213, and can rotate with the rotation of the rotating shaft 213; one end of the rocker arm 2152 is hinged to the edge of the rotating disk 2151, and the other end is hinged to one end of the connecting rod 2153; the middle part of the connecting rod 2153 is hinged to the closed end of the fixed cylinder 2141 through a pin, and the other end is hinged to one end of the chuck 2154; the other end of the chuck 2154 is installed on the closed end of the fixed cylinder 2141 and is hinged to the fixed cylinder 2141 through a pin. The pin shaft is hingedly connected to the fixed cylinder 2141; the chuck 2154 is provided with a ratchet, and the ratchet cooperates with the ratchet wheel 2155. By turning the handle 212, the rotating shaft 213 is driven to rotate, thereby driving the turntable 2151 to rotate. The rotation of the turntable 2151 drives the rocker rod 2152 to rotate, and then drives the connecting rod 2153 to rotate with the pin shaft set in the middle of the connecting rod 2153 as a fulcrum, thereby further driving the chuck 2154 to rotate with the pin shaft connected to the fixed cylinder 2141 as a fulcrum, so that the ratchet set on the chuck 2154 engages or disengages with the ratchet wheel 2155, thereby realizing that the chuck 2154 locks or unlocks the ratchet wheel 2155.

[0122] Preferably, the take-up post 2156 is used to wind and store cables; the cable entering the housing 211 is folded in half, the folded end of the cable is fixed on the take-up post 2156 , and then the excess cable is wound and stored on the take-up post 2156 .

[0123] Preferably, the first return spring 2143 and the second return spring 2157 are both coil springs.

[0124] Preferably, if Fig. 20 As shown, the lower bearing mechanism 22 includes a plurality of lower bearing connecting tubes 221, one end of the lower bearing connecting tube 221 is fixedly connected to the folding mechanism 21, and the other end is fixedly connected to the crossbeam body 111 in the crossbeam 11, and the lower bearing connecting tube 221 is used to bear the load; the lower bearing connecting tube 221 adopts at least two hollow tubes; in this embodiment, the lower bearing connecting tube 221 preferably adopts three hollow tubes, and the hollow tubes can not only be used for routing wires in the middle, but also used to enhance the bearing strength of the entire folding bearing unit 2; in addition, each hollow tube has a certain curvature, which can further enhance the bearing strength of the folding bearing unit 2 and improve the load capacity of the tractor.

[0125] Preferably, if Fig.21 and Fig. 22As shown, the upper bearing mechanism 23 includes a fixed seat 231, a plurality of upper bearing connecting tubes 232, a U-shaped plate 233, a locking sleeve 234 and a locking device 235. The fixed seat 231 is fixedly connected to the connecting seat 312 in the plug-in / drop-out mechanism 31; the locking sleeve 234 is fixedly installed on the U-shaped plate 233, one end of which is provided with a plurality of strip-shaped notches 2341 along its axial circumference, thereby forming a reducing end; the locking device 235 is sleeved on the reducing end of the locking sleeve 234; one end of the upper bearing connecting tube 232 is fixedly connected to the fixed seat 231, and the other end is passed through the locking sleeve 234, and can be inserted along the locking sleeve 234. The axis of the sleeve 234 moves; the diameter change of the reducing end of the locking sleeve 234 is adjusted by the locking device 235, so that the end of the upper load-bearing connecting tube 232 inserted into the locking sleeve 234 can be clamped or loosened. When clamped, the upper load-bearing connecting tube 232 can be fixed on the U-shaped plate 233; when loosened, the length of the upper load-bearing connecting tube 232 inserted into the locking sleeve 233 can be adjusted, so as to adjust the effective load-bearing length of the upper load-bearing connecting tube 232 according to the height of the operator, thereby realizing the overall length of the tractor being adjustable, making the tractor suitable for operators of different heights, and improving the versatility of the tractor.

[0126] Preferably, the locking device 235 is a clamp structure; the upper load-bearing connecting tube 232 adopts at least two hollow tubes; in this embodiment, the upper load-bearing connecting tube 232 preferably adopts two hollow tubes, and the hollow tube not only can be used for routing wires in the middle, but also is used to enhance the bearing strength of the entire folding load-bearing unit 2.

[0127] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for adjusting the variable length and wheelbase of a tractor, characterized in that: The following steps are involved: Step S1: adjusting the wheelbase of the tractor; Step S2: adjusting the folding angle of the folding carrying unit (2); Step S3: adjusting the overall length of the tractor.

2. A method for adjusting the variable length and wheelbase of a tractor according to claim 1, characterized in that: The method also includes: step S4: connecting the tractor to the operator; and step S5: powering on the tractor and assisting the operator.

3. A method for adjusting the variable length and wheelbase of a tractor according to claim 1, characterized in that: The step S1 also includes: adjusting the distance between two wheels (131) in the adjustable wheelbase chassis unit (1) according to the weight and volume of the load and the terrain, so that the wheelbase of the tractor is adjusted to a required distance.

4. A method for adjusting the variable length and wheelbase of a tractor according to claim 1, characterized in that: The step S3 also includes: adjusting the effective load-bearing length of the upper load-bearing mechanism (23) in the folding load-bearing unit (2) according to the weight and volume of the load and the height of the operator, thereby adjusting the overall length of the tractor.

5. A method for adjusting the variable length and wheelbase of a tractor according to claim 4, characterized in that: The step S3 also includes: releasing the clamping of the upper load-bearing connecting tube (232) by means of the locking device (235), and adjusting the length of the upper load-bearing connecting tube (232) inserted into the locking sleeve (234).

6. A method for adjusting the variable length and wheelbase of a tractor according to claim 5, characterized in that: The step S3 further comprises: after adjusting the effective load-bearing length of the upper load-bearing connecting tube (232) to a desired position, clamping and fixing the upper load-bearing connecting tube (232) by means of a locking device (235).

7. A method for adjusting the variable length and wheelbase of a tractor according to claim 2, characterized in that: The step S4 also includes: connecting or disconnecting the tractor with the wearable backboard on the waist of the operator through a disconnecting mechanism (31) in the connecting and disconnecting unit (3).

8. A method for adjusting the variable length and wheelbase of a tractor according to claim 2, characterized in that: The step S5 also includes: after the tractor is connected to the operator, the operator powers on the tractor through a handheld control terminal, and controls the tractor power assistance and accompanying protection for the operator.

9. A method for adjusting the variable length and wheelbase of a tractor according to claim 8, characterized in that: The step S5 also includes: the force sensor in the sensing assembly (32) obtains the magnitude of the traction force between the operator and the tractor, and feeds it back to the controller in the electric control cabin (14), and the controller drives and controls the drive motor (132) according to the received data.

10. A method for adjusting the variable length and wheelbase of a tractor according to claim 9, characterized in that: The step S5 also includes: obtaining the relative turning angle between the operator and the tractor by the angle sensor in the sensor assembly (32), and feeding it back to the controller in the control cabin (14), and the controller implements differential steering control on the tractor according to the received data.

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