Obstacle-avoidance cantilever three-axis lawn mower

Abstract

The present invention relates to the technical field of lawn mowers, and in particular to an obstacle-avoiding cantilever three-axis lawn mower. In order to overcome the shortcoming that conventional lawn mowers easily damage trees when mowing lawns between trees. The technical solution of the present invention is: an obstacle-avoiding cantilever three-axis lawn mower, comprising a fixed frame, the fixed frame is provided with a support frame group, the support frame group is provided with a rotating motor, the support frame group is provided with a square frame, the square frame is fixed with a fixed cylinder, the fixed cylinder is fixed with a support plate, the support plate is rotatably connected to a rotating shell, the rotating shell is rotatably connected to a transmission column, and the transmission column is fixed with a saw blade. The present invention uses a rotatable rotating shell and circumferentially evenly distributed saw blades to mow the grass between trees and on the front and rear sides of trees without damaging the trees, thereby improving the efficiency of mowing work.

Description

Technical Field

[0001] The present invention relates to the technical field of lawn mowers, and in particular to an obstacle-avoiding cantilever three-axis lawn mower. Background Art

[0002] In the standardized management of water conservancy projects, the turf ecological protection system needs to be trimmed several times a year. In order to maintain the good appearance of the water conservancy projects, the commonly used equipment at present mainly includes backpack mowers, hand-push mowers, large tractor mowers, etc., which play an important role in daily lawn maintenance.

[0003] However, lawns that need to be mowed and maintained often have obstacles such as trees. Large tractor mowers and push mowers are difficult to use effectively. Using a backpack mower consumes a lot of manpower and has low work efficiency. If operated improperly, the saw blade may damage the trees, affecting the normal mowing process. Summary of the Invention

[0004] In order to overcome the shortcoming that conventional lawn mowers easily damage trees when mowing lawns between trees, the present invention provides an obstacle-avoiding cantilever three-axis lawn mower.

[0005] The technical solution is: an obstacle-avoiding cantilever three-axis lawn mower, including a fixed frame, the fixed frame is connected to the rear of the vehicle, the fixed frame is provided with a support frame group, the support frame group is provided with a rotating motor, the support frame group is provided with a square frame, the square frame is rotatably connected to a first transmission cylinder, the first transmission cylinder is provided with a second transmission cylinder, the second transmission cylinder and the output shaft of the rotating motor are driven by a pulley and a belt, the first transmission cylinder is fixedly connected to a multi-layer transmission wheel, the square frame is fixedly connected to a fixed cylinder, the fixed cylinder passes through the first transmission cylinder and the second transmission cylinder, the fixed cylinder is fixedly connected to a support plate, the support plate is rotatably connected to a rotating shell, the rotating shell is rotatably connected to a circumferentially distributed transmission column, the transmission column and the multi-layer transmission wheel are driven by a pulley and a belt, the transmission column is fixed to a saw blade, and the square frame is provided with a trigger unlocking mechanism.

[0006] A further improvement of the present invention is that the support plate is slidably connected to a sliding block, and a first spring is provided between the sliding block and the support plate.

[0007] A further improvement of the present invention is that the top surface of the rotating shell is provided with inclined surfaces evenly distributed circumferentially, each inclined surface section is composed of a long inclined surface and a short inclined surface of equal height, and each inclined surface section is distributed corresponding to an adjacent saw blade.

[0008] A further improvement of the present invention is that the trigger unlocking mechanism includes a rotating cylinder, the rotating cylinder is rotatably connected to the square frame, a torsion spring is provided between the rotating cylinder and the square frame, the rotating cylinder is fixedly connected to a touch rod, the square frame is rotatably connected to a top wheel, the top wheel and the rotating cylinder are driven by a pulley and a belt, the top wheel is provided with a top block, the square frame is rotatably connected to an annular limit block, the lower side of the annular limit block is provided with a unidirectional inclined surface evenly distributed in the circumference, the top wheel cooperates with the annular limit block, the annular limit block is fixedly connected to a three-column limit block, the three-column The limit block is splinedly connected to a ratchet, and the square frame is rotatably connected to a pawl, and the pawl cooperates with the ratchet, and a torsion spring is provided between the pawl and the square frame, and the square frame is slidably connected to a sliding frame, and the sliding frame is rotatably connected to the three-column limit block, and the support plate is slidably connected to a wedge-shaped limit block, and the sliding frame cooperates with the wedge limit block, and a second spring is provided between the support plate and the wedge limit block, and the support plate is rotatably connected to a supporting foot, and a torsion spring is provided between the support plate and the supporting foot, and the supporting foot is limited and cooperated with the wedge limit block.

[0009] A further improvement of the present invention is that the torsion force of the torsion spring between the support plate and the support leg is smaller than the torsion force of the torsion spring between the rotating cylinder and the square frame.

[0010] A further improvement of the present invention is that the sliding frame is rotatably connected to a rotating wheel, the rotating wheel is spline-connected to the rotating cylinder, the rotating wheel is connected to a connecting rope, and the connecting rope passes through the fixed cylinder and is connected to the supporting foot.

[0011] A further improvement of the present invention is that the maximum rotation angle of the rotating drum is equal to the maximum rotation angle of the rotating wheel driven by the supporting feet through the connecting rope.

[0012] A further improvement of the present invention is that it also includes the support frame group for adapting to the height and slope of different terrains. The support frame group is arranged on the fixed frame and includes a column block. The column block is arranged on the fixed frame. The column block is fixed with a first connecting frame. The first connecting frame is hinged with a second connecting frame and a third connecting frame. The second connecting frame is fixed with the rotating motor. The second connecting frame is hinged with a fourth connecting frame. The rotating shell is provided with support wheels evenly distributed in the circumference. The third connecting frame and the fourth connecting frame are hinged with the square frame together. The first transmission cylinder is splined with the second transmission cylinder.

[0013] A further improvement of the present invention is that it also includes a buffer mechanism for buffering and slowly resetting the square frame when it is squeezed, the buffer mechanism is arranged on the fixed frame, the buffer mechanism includes a fixed block, the fixed block is fixedly connected to the fixed frame, the column block is rotatably connected to the fixed frame, a torsion spring is arranged between the column block and the fixed frame, the third connecting frame and the fourth connecting frame are jointly hinged with a fifth connecting frame, the fixed block is fixedly connected to a receiving seat, the receiving seat is ball-connected with a connecting block, the connecting block is fixedly connected to an air-tight cylinder, the air-tight cylinder is slidably connected to an air-tight column, the air-tight cylinder cooperates with the air-tight column to form a cavity, the air-tight column is hinged with a connecting ring, the connecting ring is rotatably connected to the fifth connecting frame, the air-tight cylinder is slidably connected to an air-tight valve, the inner wall of the air-tight cylinder is fixedly connected to a limiting frame, the air-tight valve is provided with a protruding column and it passes through the limiting frame and is slidably connected to it, and a third spring is arranged between the air-tight column and the limiting frame.

[0014] A further improvement of the present invention is that the side wall of the airtight valve is an inclined surface obliquely facing the airtight cylinder, and the airtight valve is provided with a small-diameter through hole.

[0015] Beneficial effects: The present invention uses a rotatable rotating shell and circumferentially evenly distributed saw blades to trim the grass between trees and on both sides of the trees without damaging the trees, thereby improving the trimming efficiency.

[0016] By rotating the top side slope of the shell, the rotating shell is always rotated in the same direction and stopped at a position suitable for trimming the grass between the trees, so that the grass between the trees can be trimmed efficiently while avoiding the occurrence of hard squeezing between the trees and the rotating shell.

[0017] By triggering the unlocking mechanism, the support feet are quickly ejected before the rotating shell is subjected to unavoidable pressure, thereby preventing excessive pressure from damaging the device.

[0018] The support legs are automatically retracted through the rotating wheels to avoid damage to the lawn.

[0019] The support frame group enables the device to adapt to lawns of different heights and slopes.

[0020] The buffer mechanism reduces the deviation angle of the pruning vehicle caused by continuous collision or squeezing of trees, making operation easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the three-dimensional structure of the square frame, the first transmission cylinder, the second transmission cylinder and other parts of the present invention;

[0023] Figure 3It is a three-dimensional structural diagram of the rotating housing, transmission column, saw blade and other parts of the present invention;

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the supporting plate, sliding block, first spring and other parts of the present invention;

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure of the rotating drum, top wheel, annular limit block and other parts of the present invention;

[0026] Figure 6 It is a schematic diagram of the three-column structure of the components such as the three-column limit block, the ratchet wheel and the pawl of the present invention;

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the sliding frame, rotating wheel, connecting rope and other parts of the present invention;

[0028] Figure 8 It is a schematic diagram of the three-dimensional structure of the wedge-shaped limit block, the second spring and the supporting foot and other parts of the present invention;

[0029] Figure 9 It is a schematic diagram of the three-dimensional structure of the column block, the first connecting frame, the second connecting frame and other parts of the present invention;

[0030] Figure 10 It is a schematic diagram of the three-dimensional structure of the first transmission cylinder, the second transmission cylinder, the fixed cylinder and other parts of the present invention;

[0031] Figure 11 It is a schematic diagram of the three-dimensional structure of the fixing block, the fifth connecting frame and the receiving seat of the present invention;

[0032] Figure 12 It is a schematic diagram of the three-dimensional structure of the airtight cylinder, airtight column, connecting ring and other parts of the present invention.

[0033] In the figure: 1-fixed frame, 2-support frame group, 201-column block, 202-first connecting frame, 203-second connecting frame, 204-third connecting frame, 205-fourth connecting frame, 3-rotating motor, 4-square frame, 5-first transmission cylinder, 6-second transmission cylinder, 7-multi-layer transmission wheel, 8-fixed cylinder, 9-support plate, 10-rotating shell, 11-transmission column, 12-saw blade, 13-sliding block, 14-first spring, 15-rotating cylinder , 16-top wheel, 17-annular limit block, 18-three-column limit block, 19-ratchet, 20-pawl, 21-sliding frame, 22-wedge limit block, 23-second spring, 24-support foot, 25-rotor, 26-connecting rope, 27-fixed block, 28-fifth connecting frame, 29-receiving seat, 30-connecting block, 31-airtight cylinder, 32-airtight column, 33-connecting ring, 34-airtight valve, 35-limiting frame, 36-third spring. DETAILED DESCRIPTION

[0034] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0035] It should be noted that terms such as "up," "down," "left," and "right" used herein to indicate directions refer only to the position of the structure depicted in the corresponding drawings. Serial numbers assigned to components herein, such as "first," "second," and so on, are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" in this application, unless otherwise specified, include both direct and indirect connections (couplings). Similar elements or parts are generally identified by similar reference numerals throughout the drawings; elements or parts in the drawings are not necessarily drawn to scale.

[0036] Example 1: An obstacle avoidance cantilever three-axis lawn mower, such as Figure 1-Figure 3 As shown, it includes a fixing frame 1, the rear side of the fixing frame 1 is connected to the rear of the vehicle, a support frame group 2 is provided on the right side of the top surface of the fixing frame 1, a rotating motor 3 is provided on the left side of the support frame group 2, a square frame 4 is provided on the right side of the support frame group 2, the inner wall of the square frame 4 is rotatably connected to the first transmission cylinder 5, the upper part of the inner wall of the first transmission cylinder 5 is provided with a second transmission cylinder 6, the upper part of the outer wall of the second transmission cylinder 6 and the output shaft of the rotating motor 3 are driven by a pulley and a belt, the lower side of the first transmission cylinder 5 is fixed with a multi-layer transmission wheel 7, the outer side wall of the multi-layer transmission wheel 7 is provided with three layers of grooves for belt winding, the square frame 4 is fixed with a fixed cylinder 8, which passes through the first transmission cylinder 5 and the second transmission cylinder 6. The lower end of the fixed cylinder 8 is fixed with a support plate 9. The upper part of the support plate 9 is disc-shaped and the lower side is rotatably connected to a rotating shell 10. The rotating shell 10 is rotatably connected to three circumferentially distributed transmission columns 11. The circumferentially distributed transmission columns 11 all pass through adjacent rotating shells 10. The three circumferentially distributed transmission columns 11 are respectively connected to the three layers of grooves on the multi-layer transmission wheel 7 through pulleys and belts. The three circumferentially distributed transmission columns 11 are all fixed with saw blades 12. The square frame 4 is provided with a trigger unlocking mechanism.

[0037] like Figure 4 As shown, the right side of the disc-shaped part of the support plate 9 is slidably connected to a sliding block 13, and a first spring 14 is arranged between the sliding block 13 and the support plate 9. The top surface of the rotating shell 10 is close to the support plate 9 and three sections of connected lifting inclined planes are evenly arranged circumferentially. Each section of the inclined plane is divided into a long inclined plane and a short inclined plane of equal height, and each section of the inclined plane is respectively distributed corresponding to the adjacent saw blade 12. The connection between the above-mentioned adjacent long and short inclined planes is concave, and the connection between each section of the reciprocating lifting inclined plane is convex, and the connection between each long and short inclined plane is located near the adjacent saw blade 12.

[0038] like Figure 5-Figure 8As shown, the trigger unlocking mechanism includes a rotating cylinder 15, which is rotatably connected to the right side of the square frame 4, a torsion spring is provided between the rotating cylinder 15 and the square frame 4, and a touch rod is fixed to the outer wall of the rotating cylinder 15. The right side of the square frame 4 is rotatably connected to the top wheel 16, and the top wheel 16 and the rotating cylinder 15 are driven by a pulley and a belt. The outer diameter of the top wheel 16 is equal to that of the rotating cylinder 15. A top block is provided on the top surface of the top wheel 16, and the square frame 4 is rotatably connected to the annular limit block 17. The lower side of the annular limit block 17 is provided with three unidirectional inclined surfaces evenly distributed in the circumferential direction. The top block of the above-mentioned top wheel 16 cooperates with the inclined surface of the above-mentioned annular limit block 17. The upper side of the annular limit block 17 is fixed with a three-column limit block 18, and the middle part of the three-column limit block 18 is splined with the ratchet 1 9. The square frame 4 is rotatably connected to a pawl 20, which cooperates with the ratchet 19. A torsion spring is provided between the pawl 20 and the square frame 4. The right side of the square frame 4 is slidably connected to a sliding frame 21, which is rotatably connected to the three-column limit block 18. The inside of the support plate 9 is slidably connected to a wedge-shaped limit block 22, which cooperates with the wedge-shaped limit block 22. A second spring 23 is provided between the support plate 9 and the wedge-shaped limit block 22. The inner wall of the support plate 9 is rotatably connected to a support foot 24, and a torsion spring is provided between the support plate 9 and the support foot 24. The torsion of the torsion spring between the support plate 9 and the support foot 24 is less than the torsion of the torsion spring between the rotating cylinder 15 and the square frame 4. The support foot 24 cooperates with the wedge-shaped limit block 22 and is restricted in rotation by the wedge-shaped limit block 22.

[0039] like Figure 5-Figure 8 As shown, the sliding frame 21 is rotatably connected to the rotating wheel 25, the rotating wheel 25 is spline-connected to the rotating cylinder 15, the rotating wheel 25 is connected to the connecting rope 26, the connecting rope 26 passes through the fixed cylinder 8 and is connected to the supporting foot 24, and the maximum rotation angle of the rotating cylinder 15 is equal to the maximum angle of rotation of the rotating wheel 25 driven by the supporting foot 24 through the connecting rope 26.

[0040] When the staff wants to trim the grass between rows of trees, they first fix the fixed frame 1 to the rear of the trimming vehicle, then start the rotating motor 3 to drive the three saw blades 12 evenly distributed in the circumference to rotate through the first transmission cylinder 5, the second transmission cylinder 6, the multi-layer transmission wheel 7 and the pulley belt, and then the staff drives the trimming vehicle to the left side of the tree so that the saw blade 12 can trim the grass between the trees, and ensure that the concave arc surface of the outer wall of the rotating shell 10 will not be squeezed by the tree, and then the staff drives the trimming vehicle forward along the tree planting route to trim the grass.

[0041] During this process, when the mowing vehicle is between two trees, the saw blade 12 trims the grass normally. When the mowing vehicle continues to move until it passes the tree, the side of the rotating shell 10 close to the tree contacts the tree. As the mowing vehicle continues to move, the rotating shell 10 is squeezed by the tree and rotates, thereby driving the transmission column 11 and the saw blade 12 to rotate together. Therefore, as the mowing vehicle moves, the tree passes by the concave side wall of the rotating shell 10 close to the tree, and the rotating shell 10 drives the other saw blade 12 to rotate in front of the tree during the above rotation process, trimming the grass in front of the tree. As the mowing vehicle continues to move, the device repeats the above process, thereby trimming the grass between the trees and on the front and back sides of the trees without damaging the trees, thereby improving the efficiency of the mowing work.

[0042] During the above process, the rotating shell 10 is squeezed by the tree and generates inertial rotation until the side of the rotating shell 10 corresponding to the other saw blade 12 contacts the front side of the above tree. However, the inertial collision is uncontrollable, and the rotating shell 10 may also bounce off quickly after colliding with the front side of the above tree, thereby affecting the trimming effect of the grass on the front side of the tree. In addition, the rotating shell 10 may rotate freely so that the side of the convex arc surface of its side wall just points to the tree that is about to be contacted, making it difficult for the rotating shell 10 to avoid obstacles by rotating, resulting in direct squeezing of the device by the tree, damaging the device and the tree.

[0043] In the initial state of the device, the sliding block 13 is acted upon by the first spring 14 to press the rotating shell 10 downward. One of the adjacent long and short inclined surfaces on the rotating shell 10 is recessed at the connection point below the sliding block 13 and is limited by it. When the rotating shell 10 is squeezed and rotated by the tree, the sliding block 13 passes through the above-mentioned short inclined surface and is squeezed and moved upward by the above-mentioned short inclined surface. The first spring 14 accumulates force until the sliding block 13 completely passes through the above-mentioned short inclined surface. At this time, the tree no longer squeezes the rotating shell 10, and the side of the rotating shell 10 corresponding to the other saw blade 12 contacts the front side of the tree. The first spring 14 releases its elastic force to move the sliding block 13 upward. When the rotating shell 10 moves downward, the sliding block 13 squeezes the long inclined surface and drives the rotating shell 10 to continue to rotate in the same direction as the squeezing and rotation of the tree, until the depression at the connection point of one of the adjacent long and short inclined surfaces on the rotating shell 10 is again located below the sliding block 13, and then the rotating shell 10 is limited to offset the reaction force generated by the contact and collision between the rotating shell 10 and the front side of the tree. No matter what angle the rotating shell 10 currently rotates to, one of the saw blades 12 will be rotated to the right under the action of the sliding block 13, so as to efficiently trim the grass between the trees and avoid the situation where the tree and the rotating shell 10 are hard squeezed.

[0044] When the device is too close to the tree laterally, until the tree can squeeze the innermost side of the concave arc surface of the outer wall of the rotating shell 10 when passing through the device, the rotating shell 10 cannot avoid the obstacle by rotating, and the transport vehicle may cause damage to the device or the tree by continuing to move. Therefore, before the device and the tree are squeezed as mentioned above, as the transport vehicle moves, the tree first contacts the top of the feeler rod of the rotating cylinder 15, and the rotating cylinder 15 is driven to rotate by the feeler rod. The torsion spring between the rotating cylinder 15 and the square frame 4 accumulates force, and the rotating cylinder 15 drives the top wheel 16 to rotate through the pulley belt. The top block on the side contacts the annular limit block 17. Since the pawl 20 limits the annular limit block 17 in one direction through the three-column limit block 18 and the ratchet 19, the annular limit block 17 moves upward under the pressure of the above-mentioned top block, and then drives the sliding frame 21 to move upward through the three-column limit block 18. The sliding frame 21 drives the rotating wheel 25 to move upward together. The rotating wheel 25 loses the spline connection with the rotating cylinder 15 and can rotate freely. At the same time, in the process of the sliding frame 21 moving upward, the lower end of the sliding frame 21 squeezes the wedge-shaped limit block 22 to move forward, and the second spring 23 is compressed and stored. When the wedge-shaped limit block 22 loses its limit on the support foot 24, the support foot 24 swings downward quickly under the action of the torsion spring between it and the support plate 9 until it touches the ground, and pulls the connecting rope 26 downward, thereby rotating the wheel 25 until the lower end of the support foot 24 touches the ground and is briefly dragged on the ground. At this time, the wheel 25 rotates 120 degrees, and the rotating cylinder 15 rotates 120 degrees. The tree squeezes the rotating shell 10 and no longer squeezes the touch rod of the rotating cylinder 15. In this process, the rotating cylinder 15 drives the top wheel 16 to rotate 120 degrees through the pulley belt, and the top block on the top wheel 16 is completely The annular limit block 17 passes one of the inclined surfaces on the lower side of the annular limit block 17, so the annular limit block 17 moves downward to the initial height, thereby driving the three-column limit block 18, the sliding frame 21 and the rotating wheel 25 to move downward, and the rotating wheel 25 and the rotating cylinder 15 resume the spline connection. The lower end of the sliding frame 21 no longer cooperates with the wedge-shaped limit block 22, and the second spring 23 releases the elastic force to make the wedge-shaped limit block 22 return to the initial position. When the rotating shell 10 is squeezed by the tree and displaced backward, the supporting foot 24 supports the rotating shell 10 through the supporting plate 9 to prevent deformation and damage to the connection between the fixed frame 1 and the vehicle body.

[0045] After the device is subjected to a certain pressure and passes through the tree according to the above process, the tree moves away from the contact rod of the rotating cylinder 15, and the torsion spring between the rotating cylinder 15 and the square frame 4 releases the torsion force to make the rotating cylinder 15 rotate in the opposite direction, thereby driving the top wheel 16 to rotate in the opposite direction, thereby driving the annular limit block 17 to rotate in the opposite direction, and at the same time, the rotating cylinder 15 drives the rotating wheel 25 to rotate in the opposite direction to pull up the connecting rope 26. In the process of the connecting rope 26 being pulled up, the supporting foot 24 rotates to cooperate with the wedge-shaped limit block 22 to squeeze the wedge-shaped limit block 22 to move forward, and the torsion spring between the supporting foot 24 and the support plate 9 accumulates force, and at the same time, the second spring 23 compresses and accumulates force. The supporting foot 24 continues to rotate until its upper side no longer contacts the lower part of the wedge-shaped limit block 22, and the second spring 23 releases the elastic force to make the wedge-shaped limit block 22 return to its initial position, and the wedge-shaped limit block 22 The limit on the support foot 24 is restored, and at this time the rotating cylinder 15, the top wheel 16 and the annular limit block 17 rotate 120 degrees in the opposite direction, and at the same time the ratchet 19 is driven to rotate in the opposite direction through the three-column limit block 18. The side of the pawl 20 adjacent to the ratchet 19 is squeezed by the side wall of the ratchet 19, and under the action of the torsion spring between the square frame 4 and the pawl 20, it rotates repeatedly in a small amplitude and always fits with the side wall of the ratchet 19. The rotating cylinder 15 and the top wheel 16 return to their initial state. The annular limit block 17 still cooperates with the top wheel 16 after rotating 120 degrees due to its three unidirectional inclined surfaces evenly distributed circumferentially on its lower side, waiting for the support foot 24 to pop out to support the device when it is squeezed above the next time. After the staff has mowed all the lawns according to the above process, they turn off the rotating motor 3 and remove the fixing frame 1 from the rear of the vehicle to end the mowing work.

[0046] Example 2: Based on Example 1, Figure 9 and Figure 10 As shown, it also includes a support frame group 2 for adapting to the height and slope of different terrains. The support frame group 2 is arranged on the fixed frame 1, and includes a column block 201. The column block 201 is arranged on the right side of the top surface of the fixed frame 1. The top surface of the column block 201 is fixed with a first connecting frame 202, and the first connecting frame 202 is hinged with a second connecting frame 203 and a third connecting frame 204. The right side of the second connecting frame 203 is fixed with the rotating motor 3, and the upper side of the second connecting frame 203 is hinged with a fourth connecting frame 205. The rotating shell 10 is provided with three support wheels evenly distributed in the circumference, the third connecting frame 204 is hinged to the side wall of the lower side of the square frame 4, the fourth connecting frame 205 is hinged to the side wall of the upper side of the square frame 4, and the inner wall of the first transmission cylinder 5 is spline-connected to the outer wall of the second transmission cylinder 6.

[0047] In the grass mowing operation of this scheme, it is often encountered that the lawn on the roadside is different in height from the road surface, and the lawn has a certain slope. When the staff mows the lawn with a height difference or a certain slope, the three support wheels evenly distributed circumferentially on the outer wall of the rotating shell 10 support the rotating shell 10 so that the mowing height is always consistent, and the square frame 4 is always perpendicular to the lawn. The support frame group 2 uses the quadrilateral principle to keep the second connecting frame 203 always parallel to the square frame 4. When the square frame 4 moves up and down or rotates, the second transmission cylinder 6 slides relative to the first transmission cylinder 5 so that the belt between the second transmission cylinder 6 and the output shaft of the rotating motor 3 is always perpendicular to the output shaft of the rotating motor 3, so as to avoid the influence of the angle difference on the belt drive of the rotating motor 3.

[0048] Example 3: Based on Example 2, Figure 11 and Figure 12 As shown, a buffer mechanism is also included for buffering and slowly resetting the square frame 4 when it is squeezed. The buffer mechanism is arranged on the fixed frame 1. The buffer mechanism includes a fixed block 27, which is fixed to the fixed frame 1. The column block 201 is rotatably connected to the fixed frame 1. A torsion spring is provided between the column block 201 and the fixed frame 1. The third connecting frame 204 and the fourth connecting frame 205 are hinged together with the fifth connecting frame 28, and the third connecting frame 204 is hinged to the lower side of the fifth connecting frame 28, and the fourth connecting frame 205 is hinged to the lower side of the fifth connecting frame 28. The upper part of the right side wall of the fixed block 27 is fixed with a receiving seat 29, and the right side ball of the receiving seat 29 is connected to the connecting block 30. An airtight cylinder 31 is fixedly connected to the right side of the connecting block 30, and an airtight column 32 is slidably connected to the inner wall of the airtight cylinder 31. The airtight cylinder 31 and the airtight column 32 cooperate to form a cavity. A connecting ring 33 is hinged on the right side of the airtight column 32, and the connecting ring 33 is rotatably connected to the side wall of the middle part of the fifth connecting frame 28. An airtight valve 34 is slidably connected to the left front side of the airtight cylinder 31. The side wall of the airtight valve 34 is an inclined surface obliquely facing the airtight cylinder 31, and a small-diameter through hole is provided on the airtight valve 34. The inner wall of the airtight cylinder 31 is fixedly connected to a limiting frame 35. The raised column of the airtight valve 34 passes through the limiting frame 35 and is slidably connected to it. A third spring 36 is provided between the airtight column 32 and the limiting frame 35.

[0049] In the above-mentioned turf mowing operation, when the mowing vehicle is too close to the tree and cannot avoid the obstacle and is squeezed, since this type of device is arranged at the rear of the mowing vehicle, the squeezing of the tree on the device will cause the rear wheel of the mowing vehicle to move to the left, thereby causing the vehicle body to shift to the right. As the mowing vehicle continues to move, the lateral distance to the tree may be further shortened. Therefore, the staff driving the mowing vehicle may need to frequently adjust the driving direction, and even the tree may be stuck in the mowing vehicle, causing damage to the device and the tree.

[0050] When the device is squeezed by an unavoidable obstacle, the column block 201 drives the various parts on it to rotate to avoid the squeeze causing damage and deformation of the device. In this process, the torsion spring between the column block 201 and the fixed frame 1 accumulates force, and the fixed block 27 and the fifth connecting frame 28 squeeze each other to make the airtight column 32 slide along the inner wall of the airtight cylinder 31 toward the airtight valve 34, squeezing the third spring 36 to compress and accumulate force. The gas between the airtight column 32 and the airtight cylinder 31 is compressed, thereby squeezing the airtight valve 34 to slide in the direction away from the airtight column 32. Therefore, the gas between the airtight column 32 and the airtight cylinder 31 quickly overflows through the gap between the airtight valve 34 and the airtight cylinder 31.

[0051] When the pruning vehicle completely passes the tree and the device is no longer squeezed by it, the third spring 36 releases its elastic force, and drives the column block 201 and the parts thereon to rotate in the opposite direction through the connecting ring 33 and the fifth connecting frame 28. The airtight column 32 slides toward the connecting ring 33 along the inner wall of the airtight cylinder 31, and the outside air enters the cavity between the airtight column 32 and the airtight cylinder 31 through the gap between the airtight valve 34 and the airtight cylinder 31. The rapid flow of air reduces the gas pressure in the above gap, thereby causing the airtight valve 34 to slide in the opposite direction until it contacts the airtight cylinder 31, and then the outside air still passes through the airtight valve 34. The small through hole on the upper part slowly enters the cavity between the airtight column 32 and the airtight tube 31, and the airtight column 32 slowly slides to drive the column block 201 and the parts thereon to slowly rotate in the opposite direction until the torsion spring of 201 is reset and the above parts are restored to their initial state. The slow reset of the above parts reduces the squeezing of the next tree on the device after the pruning vehicle deviates, thereby reducing the offset angle that the staff needs to correct, avoiding the situation where the staff fails to adjust the direction in time and the device is continuously squeezed by the trees, further causing the driving path to deviate and even causing damage to the device or the tree, thereby improving the pruning efficiency and safety.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention. The scope of protection claimed in the present invention is defined by the attached claims and their equivalents.

Claims

1. An obstacle avoidance cantilever three-axis lawn mower, characterized in that: The invention comprises a fixing frame (1), wherein the fixing frame (1) is connected to the rear of the vehicle, the fixing frame (1) is provided with a support frame group (2), the support frame group (2) is provided with a rotating motor (3), the support frame group (2) is provided with a square frame (4), the square frame (4) is rotatably connected to a first transmission cylinder (5), the first transmission cylinder (5) is provided with a second transmission cylinder (6), the second transmission cylinder (6) and the output shaft of the rotating motor (3) are driven by a pulley and a belt, the first transmission cylinder (5) is fixedly connected with a multi-layer transmission wheel (7), and the first transmission cylinder (5) is fixed with a multi-layer transmission wheel (7). The square frame (4) is fixedly connected to a fixed cylinder (8), the fixed cylinder (8) passes through the first transmission cylinder (5) and the second transmission cylinder (6), the fixed cylinder (8) is fixedly connected to a support plate (9), the support plate (9) is rotatably connected to a rotating shell (10), the rotating shell (10) is rotatably connected to a circumferentially distributed transmission column (11), the transmission column (11) and the multi-layer transmission wheel (7) are driven by a pulley and a belt, the transmission column (11) is fixedly connected to a saw blade (12), and the square frame (4) is provided with a trigger unlocking mechanism; The trigger unlocking mechanism includes a rotating cylinder (15), the rotating cylinder (15) is rotatably connected to the square frame (4), a torsion spring is provided between the rotating cylinder (15) and the square frame (4), the rotating cylinder (15) is fixedly connected to a touch rod, the square frame (4) is rotatably connected to a top wheel (16), the top wheel (16) and the rotating cylinder (15) are driven by a pulley and a belt, the top wheel (16) is provided with a top block, the square frame (4) is rotatably connected to an annular limit block (17), the lower side of the annular limit block (17) is provided with a unidirectional inclined surface evenly distributed in the circumferential direction, the top wheel (16) cooperates with the annular limit block (17), the annular limit block (17) is fixedly connected to a three-column limit block (18), and the three-column limit block (18) is spline-connected to a ratchet (19), The square frame (4) is rotatably connected to a pawl (20), the pawl (20) cooperates with the ratchet (19), a torsion spring is provided between the pawl (20) and the square frame (4), the square frame (4) is slidably connected to a sliding frame (21), the sliding frame (21) is rotatably connected to the three-column limit block (18), the support plate (9) is slidably connected to a wedge-shaped limit block (22), the sliding frame (21) cooperates with the wedge-shaped limit block (22), a second spring (23) is provided between the support plate (9) and the wedge-shaped limit block (22), the support plate (9) is rotatably connected to a support foot (24), a torsion spring is provided between the support plate (9) and the support foot (24), and the support foot (24) is limitedly matched with the wedge-shaped limit block (22).

2. The obstacle avoidance cantilever three-axis lawn mower according to claim 1, characterized in that: The support plate (9) is slidably connected to a sliding block (13), and a first spring (14) is provided between the sliding block (13) and the support plate (9).

3. The obstacle avoidance cantilever three-axis lawn mower according to claim 1, characterized in that: The top surface of the rotating shell (10) is provided with inclined surfaces evenly distributed in the circumferential direction, each inclined surface section is composed of a long inclined surface and a short inclined surface of equal height, and each inclined surface section is distributed correspondingly to an adjacent saw blade (12).

4. The obstacle avoidance cantilever three-axis lawn mower according to claim 1, characterized in that: The torsion force of the torsion spring between the support plate (9) and the support foot (24) is smaller than the torsion force of the torsion spring between the rotating cylinder (15) and the square frame (4).

5. The obstacle avoidance cantilever three-axis lawn mower according to claim 1, characterized in that: The sliding frame (21) is rotatably connected to a rotating wheel (25), the rotating wheel (25) is spline-connected to the rotating cylinder (15), the rotating wheel (25) is connected to a connecting rope (26), and the connecting rope (26) passes through the fixed cylinder (8) and is connected to the supporting foot (24).

6. The obstacle avoidance cantilever three-axis lawn mower according to claim 5, characterized in that: The maximum rotation angle of the rotating drum (15) is equal to the maximum rotation angle of the rotating wheel (25) driven by the supporting foot (24) through the connecting rope (26).

7. The obstacle avoidance cantilever three-axis lawn mower according to claim 1, characterized in that: The support frame group (2) includes a column block (201), the column block (201) is arranged on the fixed frame (1), the column block (201) is fixedly connected to a first connecting frame (202), the first connecting frame (202) is hingedly connected to a second connecting frame (203) and a third connecting frame (204), the second connecting frame (203) is fixedly connected to the rotating motor (3), the second connecting frame (203) is hingedly connected to a fourth connecting frame (205), the rotating shell (10) is provided with support wheels evenly distributed in the circumferential direction, the third connecting frame (204) and the fourth connecting frame (205) are hingedly connected to the square frame (4), and the first transmission cylinder (5) and the second transmission cylinder (6) are spline-connected.

8. The obstacle avoidance cantilever three-axis lawn mower according to claim 7, characterized in that: The invention also includes a buffer mechanism for buffering and slowly resetting the square frame (4) when the square frame (4) is squeezed, and the buffer mechanism is arranged on the fixing frame (1), and the buffer mechanism includes a fixing block (27), the fixing block (27) is fixed to the fixing frame (1), the column block (201) is rotatably connected to the fixing frame (1), a torsion spring is arranged between the column block (201) and the fixing frame (1), the third connecting frame (204) and the fourth connecting frame (205) are hingedly connected to the fifth connecting frame (28), the fixing block (27) is fixedly connected to the receiving seat (29), the receiving seat (29) is ball-connected to the connecting block (30), and the connecting block (30) is fixedly connected to an airtight cylinder (31), and the airtight cylinder (31) is slidably connected to an airtight column (32), and the airtight cylinder (31) and the airtight column (32) cooperate to form a cavity, and the airtight column (32) is hinged with a connecting ring (33), and the connecting ring (33) is rotatably connected to the fifth connecting frame (28), and the airtight cylinder (31) is slidably connected to an airtight valve (34), and the inner wall of the airtight cylinder (31) is fixedly connected to a limiting frame (35), and the airtight valve (34) is provided with a protruding column and passes through the limiting frame (35) and is slidably connected to it, and a third spring (36) is provided between the airtight column (32) and the limiting frame (35).

9. The obstacle avoidance cantilever three-axis lawn mower according to claim 8, characterized in that: The side wall of the airtight valve (34) is an inclined surface obliquely facing the airtight cylinder (31), and a small-diameter through hole is provided on the airtight valve (34).

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