Brush cutter

Abstract

The present invention provides a brush cutter, comprising: a vehicle body; a brush cutting device disposed at the front end of the vehicle body, the brush cutting device including a first driving part and a brush cutting blade, the first driving part driving the brush cutting blade to rotate, and the brush cutting blade being used for performing brush cutting operations on the land; a plurality of hard stone detection components which are telescopically arranged, the plurality of hard stone detection components being arranged side by side in the width direction of the vehicle body on the brush cutting device, each hard stone detection component being located above the brush cutting blade, and at least a part of each hard stone detection component being located in front of the brush cutting blade, the hard stone detection components being used for detecting the pressure of hard stones on the land; and a control part which is electrically connected to the hard stone detection components and the first driving part, the control part being used for receiving the information detected by the hard stone detection components, and the control part controlling the opening and closing of the first driving part. Through the technical solution provided by the present invention, the problem that the brush cutter in the prior art does not have a hard stone detection function can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of brush cutting, and in particular, to a brush cutter. Background Art

[0002] In recent years, the remediation of coal-based soil has become the focus of soil remediation. Among them, the early soil sampling, the mid-term soil leveling, and the late soil improvement all involve brush cutting operations in the corresponding areas. Especially in the soil improvement stage, brush cutting operations need to be carried out on all rectification areas. In the prior art, large-scale brush cutting operations, especially those using large motorized brush cutters that can drive and move.

[0003] For example, the utility model patent with the authorization announcement number CN205336861U, the authorization announcement date of June 29, 2016, and the name of "A Self-propelled Garden Brush Cutter" includes an engine, a hydraulic oil tank mechanism, a chassis assembly, an operating platform, a radiator, a traveling hydraulic motor, a cutting device, and a frame. The engine is arranged at the rear of the frame, the hydraulic oil tank mechanism is arranged in front of the engine, the chassis assembly is arranged at the lower part of the frame, the operating platform is arranged in front of the hydraulic oil tank mechanism, the radiator is arranged in front of the operating platform, the traveling hydraulic motor is arranged in front of the radiator, the traveling hydraulic motor is connected to the cutting device, the cutting device includes a cutting hydraulic motor, a cutting saw blade, and a belt pulley. The cutting hydraulic motor drives the belt pulley to rotate through a belt sleeved on the shaft, and the cutting saw blade is connected to the lower part of the belt pulley.

[0004] In the prior art, the designs of brush cutters are all aimed at the expected operating environment. For example, garden brush cutters are for garden repair, small brush cutters are for lawns or small trees, etc. When these brush cutters are applied to the ecological restoration of soil, problems occur. The land that needs ecological restoration is almost all wasteland, which contains a large number of hard stones protruding from the ground surface, and quite a part of the hard stones are hidden by the green vegetation to be cleared. This is not the case in the prior art brush cutting environment, which leads to the blades of the brush cutter frequently hitting hard stones, greatly reducing the service life. Summary of the Invention

[0005] The present invention provides a brush cutter to solve the problem that the brush cutter in the prior art does not have a hard stone detection function.

[0006] To solve the above problems, the present invention provides a brush cutter, comprising: a vehicle body; a brush cutting device, which is arranged at the front end of the vehicle body, the brush cutting device includes a first driving part and a brush cutting knife, the first driving part drives the brush cutting knife to rotate, and the brush cutting knife is used for performing brush cutting operation on the land; a plurality of hard stone detection components, the hard stone detection components are arranged in a telescopic manner, the plurality of hard stone detection components are arranged side by side in the width direction of the vehicle body on the brush cutting device, each hard stone detection component is located above the brush cutting knife, and at least a part of each hard stone detection component is located in front of the brush cutting knife, and the hard stone detection components are used for detecting whether there are hard stones on the land; a control part, the control part is electrically connected to the hard stone detection components and the first driving part, the control part is used for receiving the information detected by the hard stone detection components, and the control part controls the opening and closing of the first driving part.

[0007] Further, the brush cutting device has a symmetry plane, the symmetry plane divides the brush cutting device into two symmetric parts, the symmetry plane divides the plurality of hard stone detection components into two symmetric parts, and along the direction from the symmetry plane to the side wall of the brush cutting device, the lengths of the plurality of hard stone detection components gradually decrease.

[0008] Further, the hard stone detection component includes a detection rod and a pressure sensor, the detection rod is arranged on the brush cutting device in a telescopic manner, the telescopic direction of the detection rod is the moving direction of the vehicle body, one end of the detection rod is located in front of the brush cutting knife, the pressure sensor is installed at the end of the detection rod located in front of the brush cutting knife, the pressure sensor is electrically connected to the control part, and the pressure sensor is used for detecting the pressure of the hard stone on the land received.

[0009] Further, the hard stone detection component further includes a connecting rod, a first elastic member and a second elastic member, the brush cutting device includes a connecting frame, the connecting frame is connected to the vehicle body, the connecting rod is connected to one end of the detection rod, the detection rod passes through the connecting frame, one end of the first elastic member is connected to the connecting frame, the other end of the first elastic member is connected to the connecting rod, one end of the second elastic member is connected to the connecting frame, the other end of the second elastic member is connected to the connecting rod, and the first elastic member and the second elastic member are respectively located on both sides of the detection rod.

[0010] Further, the brush cutting device further includes a connecting frame and a guiding cylinder, the connecting frame is connected to the vehicle body, the detection rod is arranged on the connecting frame in a telescopic manner, the guiding cylinder is connected to the connecting frame and passes through the connecting frame, the guiding cylinder is sleeved on the detection rod and is in limit fit with the detection rod in the radial direction.

[0011] Further, the hard stone detection component includes a detection rod and a travel switch, the detection rod is arranged on the brush cutting device in a telescopic manner, the telescopic direction of the detection rod is the moving direction of the vehicle body, the detection rod is located in front of the brush cutting knife, the travel switch is electrically connected to the control part, the detection rod triggers the travel switch when contracting, and the travel switch controls the first driving part to close through the control part.

[0012] Further, the brush cutter further includes a second driving part, a connecting frame, and a sliding frame. The connecting frame is connected to the vehicle body. The first driving part and the brush cutter are both arranged on the connecting frame. The sliding frame is arranged on the connecting frame and is in sliding fit with the connecting frame. A plurality of hard stone detection components are arranged side by side on the sliding frame in the width direction of the vehicle body. The second driving part drives the sliding frame to move. The second driving part is electrically connected to the control part. When the hard stone detection component comes into contact, the second driving part drives the sliding frame to move away from the hard stone.

[0013] Further, the hard stone detection component includes a detection rod and a support rod. The brush cutter further includes a guide cylinder arranged on the connecting frame. One end of the detection rod is telescopically arranged on the sliding frame. The telescopic direction of the detection rod is the length direction of the vehicle body. The other end of the detection rod passes through the guide cylinder and is in limit fit with the guide cylinder in the radial direction. The support rod is rotatably arranged on the detection rod. The support rod has a protection position and a strengthening position. When in the strengthening position, the detection rod and the support rod are parallel. When in the protection position, the detection rod and the support rod are perpendicular to each other, and the height of the support rod from the ground is less than the height of the brush cutter from the ground.

[0014] Further, the detection rod has a groove. The opening direction of the groove faces the ground. The hard stone detection component further includes a rotating shaft and a torsion spring. The support rod is located in the groove. The rotating shaft is arranged on the inner wall of the groove. The support rod is rotatably connected to the detection rod through the rotating shaft. One end of the torsion spring is connected to the support rod, and the other end of the torsion spring is connected to the inner wall of the groove.

[0015] Further, the brush cutter further includes a transmission mechanism. The first driving part drives the brush cutter to rotate through the transmission mechanism.

[0016] Applying the technical solution of the present invention, a brush cutter is provided, including: a vehicle body; a brush cutting device disposed at the front end of the vehicle body, the brush cutting device including a first driving part and a brush cutting knife, the first driving part driving the brush cutting knife to rotate, and the brush cutting knife being used for performing brush cutting operations on the land; a plurality of hard stone detection components telescopically arranged, the plurality of hard stone detection components being arranged side by side in the width direction of the vehicle body on the brush cutting device, each hard stone detection component being located above the brush cutting knife, and at least a part of each hard stone detection component being located in front of the brush cutting knife, the hard stone detection components being used for detecting the pressure of hard stones on the land; a control part electrically connected to the hard stone detection components and the first driving part, the control part being used for receiving the information detected by the hard stone detection components, and the control part controlling the opening and closing of the first driving part. With this solution, the plurality of hard stone detection components are arranged side by side in the width direction of the vehicle body on the brush cutting device, and at least a part of each hard stone detection component is located in front of the brush cutting knife, so that before the brush cutting knife performs brush cutting operations, it is possible to detect whether there are hard stones in front of the brush cutting knife through the hard stone detection components, and then transmit the detected information to the control part, and control the opening or closing of the first driving part through the control part, so as to open or close the brush cutting knife, preventing the brush cutting knife from frequently hitting hard stones, thereby greatly improving the service life of the brush cutting knife; and each hard stone detection component is arranged above the brush cutting knife, so that when the brush cutting knife is working, it will not interfere with the brush cutting knife, improving the working efficiency; using the brush cutter of this solution effectively solves the problem that the brush cutter in the prior art does not have a hard stone detection function. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 shows a schematic structural diagram of a brush cutter provided by an embodiment of the present invention;

[0019] Figure 2 shows Figure 1 a top view of a partial structure of the brush cutting device in

[0020] Figure 3 shows Figure 1 a schematic structural diagram of the detection component installed on the brush cutting device in

[0021] Figure 4 shows a schematic structural diagram of the detection component installed on the brush cutting device provided by another embodiment of the present invention;

[0022] Figure 5 shows a schematic structural diagram of the detection component and the guide cylinder provided by still another embodiment of the present invention.

[0023] Among them, the above-mentioned drawings include the following reference numerals:

[0024] 10, vehicle body;

[0025] 20, brush cutter device; 21, brush cutter; 22, connecting frame; 23, guide cylinder; 24, second driving part; 25, sliding frame;

[0026] 30, hard rock detection component; 31, detection rod; 311, groove; 32, connecting rod; 33, first elastic member; 34, second elastic member; 35, support rod. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes a limitation to the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] As Figures 1 to 3 shown, an embodiment of the present invention provides a brush cutter, including: a vehicle body 10; a brush cutter device 20, the brush cutter device 20 is arranged at the front end of the vehicle body 10, the brush cutter device 20 includes a first driving part and a brush cutter 21, the first driving part drives the brush cutter 21 to rotate, and the brush cutter 21 is used for performing brush cutting operations on the land; a plurality of hard rock detection components 30, the hard rock detection components 30 are telescopically arranged, the plurality of hard rock detection components 30 are arranged side by side in the width direction of the vehicle body 10 on the brush cutter device 20, each hard rock detection component 30 is located above the brush cutter 21, at least a part of each hard rock detection component 30 is located in front of the brush cutter 21, and the hard rock detection components 30 are used for detecting whether there are hard rocks on the land; a control part, the control part is electrically connected to the hard rock detection components 30 and the first driving part, and the control part is used for receiving the information detected by the hard rock detection components 30, and the control part controls the opening and closing of the first driving part.

[0029] With this solution, a plurality of hard stone detection components 30 are arranged side by side in the width direction of the vehicle body 10 on the brush cutter 20, and at least a part of each hard stone detection component 30 is located in front of the brush cutter 21. In this way, before the brush cutter 21 performs brush cutting operations, the hard stone detection component 30 can detect whether there are hard stones in front of the brush cutter 21, and then transmit the detected information to the control unit, and the control unit controls the opening or closing of the first driving unit, thereby opening or closing the brush cutter 21, preventing the brush cutter 21 from frequently hitting hard stones, thus greatly improving the service life of the brush cutter 21; and each hard stone detection component 30 is arranged above the brush cutter 21, so that it will not interfere with the brush cutter 21 during the operation of the brush cutter 21, improving the work efficiency; the brush cutter using this solution effectively solves the problem that the existing brush cutter does not have a hard stone detection function.

[0030] Among them, the brush cutter 20 has a symmetry plane, the symmetry plane divides the brush cutter 20 into two symmetrical parts, and the symmetry plane divides the plurality of hard stone detection components 30 into two symmetrical parts. Along the symmetry plane towards the side wall direction of the brush cutter 20, the lengths of the plurality of hard stone detection components 30 gradually decrease. With the above arrangement, when the hard stone is not very stable and can be pushed, this arrangement can be relied on to gradually push the hard stone from the front of the symmetry plane to the edge close to the side wall of the brush cutter 20. Specifically, the hard stone detection component 30 located at the symmetry plane position pushes the hard stone to shift, and the shifted hard stone reaches its adjacent shorter hard stone detection component 30, and the shorter hard stone detection component 30 further pushes the hard stone to shift to an even shorter hard stone detection component 30, and so on, until finally the hard stone is pushed to the edge of the side wall of the brush cutter 20, that is, the plurality of hard stone detection components 30 have the function of pushing some hard stones.

[0031] Furthermore, the hard stone detection component 30 includes a detection rod 31 and a pressure sensor. The detection rod 31 is telescopically arranged on the brush cutter 20, the telescopic direction of the detection rod 31 is the moving direction of the vehicle body 10, one end of the detection rod 31 is located in front of the brush cutter 21, the pressure sensor is installed at one end of the detection rod 31 located in front of the brush cutter 21, the pressure sensor is electrically connected to the control unit, and the pressure sensor is used to detect the pressure of the hard stone on the ground. With the above arrangement, the detection rod 31 is telescopically arranged on the brush cutter 20, so that when the detection rod 31 touches a hard stone, it can play a buffering role for the detection rod 31 to prevent the detection rod 31 from being damaged; when the pressure sensor detects the pressure of the hard stone on the ground, it transmits the detected information to the control unit, and the control unit controls the opening or closing of the brush cutter 21.

[0032] Specifically, when the extrusion force detected by the pressure sensor is too large, for example, greater than 30 N or greater than 100 N, and when the staff observes or detects that there are no large trees ahead, it can be determined that a hard rock has been encountered. At this time, the staff can actively or automatically stop the rotation of the brush cutter 21 to prevent the high-speed rotating brush cutter 21 from hitting the hard rock, and at the same time make other treatments, such as bypassing the hard rock or manually removing the hard rock, etc.

[0033] Among them, the hard rock detection component 30 further includes a connecting rod 32, a first elastic member 33 and a second elastic member 34. The brush cutting device 20 includes a connecting frame 22. The connecting frame 22 is connected to the vehicle body 10. One end of the connecting rod 32 is connected to the detection rod 31. The detection rod 31 passes through the connecting frame 22. One end of the first elastic member 33 is connected to the connecting frame 22, and the other end of the first elastic member 33 is connected to the connecting rod 32. One end of the second elastic member 34 is connected to the connecting frame 22, and the other end of the second elastic member 34 is connected to the connecting rod 32. The first elastic member 33 and the second elastic member 34 are respectively located on both sides of the detection rod 31. With the above connection method, when the detection rod 31 hits a hard rock, the first elastic member 33 and the second elastic member 34 can play a buffering role on the detection rod 31, and the setting of the connecting rod 32 can reduce the shaking of the detection rod 31, so that the detection rod 31 remains relatively stable, thus ensuring the stability of the hard rock detection component 30 during operation. And when the detection rod 31 pushes the hard rock, it can drive the first elastic member 33 and the second elastic member 34 to deform, so that the detection rod 31 exerts a greater lateral extrusion force on the hard rock to improve its pushing ability on the hard rock.

[0034] Specifically, the brush cutting device 20 further includes a connecting frame 22 and a guide cylinder 23. The connecting frame 22 is connected to the vehicle body 10. The detection rod 31 is telescopically arranged on the connecting frame 22. The guide cylinder 23 is connected to the connecting frame 22 and passes through the connecting frame 22. The guide cylinder 23 is sleeved on the detection rod 31 and is in limit fit with the detection rod 31 in the radial direction. The guide cylinder 23 is sleeved on the detection rod 31 and is in limit fit with the detection rod 31 in the radial direction, so that it can play a limiting role on the detection rod 31 in the radial direction and ensure the stability during operation.

[0035] Alternatively, the hard rock detection component 30 includes a detection rod 31 and a travel switch. The detection rod 31 is telescopically arranged on the brush cutting device 20. The telescopic direction of the detection rod 31 is the moving direction of the vehicle body 10. The detection rod 31 is located in front of the brush cutter 21. The travel switch is electrically connected to the control unit. When the detection rod 31 contracts, it triggers the travel switch, and the travel switch controls the first drive unit to close through the control unit. With this setting, when the detection rod 31 triggers the travel switch after contraction, the travel switch controls the first drive unit to close through the control unit, that is, the purpose of controlling the opening or closing of the brush cutter 21 is achieved.

[0036] Such as Figure 4As shown, in another embodiment of the present invention, the brush cutter device 20 further includes a second driving part 24, a connecting frame 22 and a sliding frame 25. The connecting frame 22 is connected to the vehicle body 10. The first driving part and the brush cutter 21 are both arranged on the connecting frame 22. The sliding frame 25 is arranged on the connecting frame 22 and is in sliding fit with the connecting frame 22. A plurality of hard stone detection components 30 are arranged side by side on the sliding frame 25 along the width direction of the vehicle body 10. The second driving part 24 drives the sliding frame 25 to move, and the second driving part 24 is electrically connected to the control part; when the hard stone detection component 30 comes into contact, the second driving part 24 drives the sliding frame 25 to move in a direction away from the hard stone. With the above connection method, a plurality of hard stone detection components 30 are arranged side by side on the sliding frame 25 along the width direction of the vehicle body 10. In this way, when the hard stone detection component 30 detects a hard stone ahead, the second driving part 24 can drive the sliding frame 25 to move in a direction away from the hard stone, so as to play a role of active avoidance, so that the brush cutter 21 can cut down the arbor; and when the hard stone detection component 30 is not required to function, the second driving part 24 can also drive the sliding frame 25 to move in a direction away from the hard stone.

[0037] As Figure 5 As shown, in another embodiment of the present invention, the hard stone detection component 30 includes a detection rod 31 and a support rod 35. The brush cutter device 20 further includes a guide cylinder 23. The guide cylinder 23 is arranged on the connecting frame 22. One end of the detection rod 31 is telescopically arranged on the sliding frame 25. The telescopic direction of the detection rod 31 is the length direction of the vehicle body 10. The other end of the detection rod 31 passes through the guide cylinder 23 and is in limit fit with the guide cylinder 23 in the radial direction. The support rod 35 is rotatably arranged on the detection rod 31. The support rod 35 has a protection position and a strengthening position. In the strengthening position, the detection rod 31 and the support rod 35 are parallel. In the protection position, the detection rod 31 and the support rod 35 are perpendicular to each other, and the height of the support rod 35 from the ground is less than the height of the brush cutter 21 from the ground. With such a setting, when the support rod 35 is in the strengthening position, the detection rod 31 and the support rod 35 are parallel, which can enhance the structural strength of the detection rod 31 and ensure the stability of the detection rod 31 during detection; when the support rod 35 is in the protection position, the detection rod 31 and the support rod 35 are perpendicular to each other, and the height of the support rod 35 from the ground is less than the height of the brush cutter 21 from the ground. In this way, during operation, the end of the support rod 35 first contacts the ground, which can prevent the brush cutter 21 from hitting the ground first when moving vertically.

[0038] Among them, the detection rod 31 has a groove 311, the opening direction of the groove 311 faces the ground, the hard stone detection assembly 30 further includes a rotating shaft and a torsion spring. The support rod 35 is located in the groove 311, the rotating shaft is arranged on the inner wall of the groove 311, the support rod 35 is rotationally connected to the detection rod 31 through the rotating shaft, one end of the torsion spring is connected to the support rod 35, and the other end of the torsion spring is connected to the inner wall of the groove 311. With the above connection method, through the action of the torsion spring and the rotating shaft, the support rod 35 can be in a protection position or a strengthening position.

[0039] It should be noted that: the support rod 35 is located on and adheres to the front side surface of the guide cylinder 23, and the support rod 35 is rotationally connected to the detection rod 31 through the rotating shaft and the torsion spring. With such a setting, the switching of the support rod 35 between the strengthening position and the protection position can be driven by the second driving part 24. In the natural state, the support rod 35 is in the protection position. At this time, the second driving part 24 pulls the detection rod 31 to move backward. At this time, due to the limitation of the guide cylinder 23, the support rod 35 is forced to rotate from the protection position to the strengthening position. Subsequently, if the second driving part 24 drives the detection rod 31 to move forward, then due to the elastic force of the torsion spring, the support rod 35 automatically rotates from the strengthening position to the protection position. Such a setting brings another effect. When the detection rod 31 hits a hard stone and deflects, due to the deflection, the detection rod 31 swings left and right in the guide cylinder 23. At this time, the support rod 35 is passively rotated from the protection position to the strengthening position, and this is exactly the moment when the detection rod 31 is prone to deformation. That is, when swinging, the support rod 35 is passively triggered to enter the strengthening position to enhance the protection of the detection rod 31.

[0040] Specifically, the brush cutter device 20 further includes a transmission mechanism, and the first driving part drives the brush cutter 21 to rotate through the transmission mechanism. Through the transmission mechanism, the brush cutter 21 can be better connected, so as to drive the brush cutter 21 to rotate.

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

Claims

1. A brush cutter, characterized in that, Comprising: A vehicle body (10); A brush cutting device (20), the brush cutting device (20) being arranged at the front end of the vehicle body (10), the brush cutting device (20) comprising a first driving part and a brush cutting blade (21), the first driving part driving the brush cutting blade (21) to rotate, and the brush cutting blade (21) being used for performing brush cutting operations on the land; A plurality of hard stone detection components (30), the hard stone detection components (30) being arranged in a telescopic manner, the plurality of hard stone detection components (30) being arranged side by side in the width direction of the vehicle body (10) on the brush cutting device (20), each hard stone detection component (30) being located above the brush cutting blade (21), and at least a part of each hard stone detection component (30) being located in front of the brush cutting blade (21), the hard stone detection components (30) being used for detecting whether there are hard stones on the land; A control part, the control part being electrically connected to the hard stone detection components (30) and the first driving part, the control part being used for receiving the information detected by the hard stone detection components (30), and the control part controlling the opening and closing of the first driving part; The brush cutting device (20) has a symmetry plane, the symmetry plane dividing the brush cutting device (20) into two symmetrical parts, the symmetry plane dividing the plurality of hard stone detection components (30) into two symmetrical parts, and along the symmetry plane towards the side wall direction of the brush cutting device (20), the lengths of the plurality of hard stone detection components (30) gradually decrease; The hard stone detection component (30) comprises a detection rod (31) and a pressure sensor, the detection rod (31) being arranged in a telescopic manner on the brush cutting device (20), the telescopic direction of the detection rod (31) being the moving direction of the vehicle body (10), one end of the detection rod (31) being located in front of the brush cutting blade (21), the pressure sensor being installed at one end of the detection rod (31) located in front of the brush cutting blade (21), the pressure sensor being electrically connected to the control part, and the pressure sensor being used for detecting the pressure of the hard stones on the land received; 2. The brush cutter according to claim 1, characterized in that, The hard stone detection component (30) further comprises a connecting rod (32), a first elastic member (33) and a second elastic member (34), the brush cutting device (20) comprising a connecting frame (22), the connecting frame (22) being connected to the vehicle body (10), the connecting rod (32) being connected to one end of the detection rod (31), the detection rod (31) passing through the connecting frame (22), one end of the first elastic member (33) being connected to the connecting frame (22), the other end of the first elastic member (33) being connected to the connecting rod (32), one end of the second elastic member (34) being connected to the connecting frame (22), the other end of the second elastic member (34) being connected to the connecting rod (32), and the first elastic member (33) and the second elastic member (34) being respectively located on both sides of the detection rod (31).

3. The brush cutter according to claim 1, characterized in that, The brush cutting device (20) further includes a connecting frame (22) and a guide cylinder (23). The connecting frame (22) is connected to the vehicle body (10). The detection rod (31) is telescopically arranged on the connecting frame (22). The guide cylinder (23) is connected to the connecting frame (22) and passes through the connecting frame (22). The guide cylinder (23) is sleeved on the detection rod (31) and is in limit fit with the detection rod (31) in the radial direction.

4. The brush cutter according to claim 1, characterized in that, The hard rock detection assembly (30) includes a travel switch. The detection rod (31) is telescopically arranged on the brush cutting device (20). The telescopic direction of the detection rod (31) is the moving direction of the vehicle body (10). The detection rod (31) is located in front of the brush cutting knife (21). The travel switch is electrically connected to the control unit. When the detection rod (31) contracts, it triggers the travel switch, and the travel switch controls the first drive unit to close through the control unit.

5. The brush cutter according to claim 1, characterized in that, The brush cutting device (20) further includes a second drive unit (24), a connecting frame (22) and a sliding frame (25). The connecting frame (22) is connected to the vehicle body (10). The first drive unit and the brush cutting knife (21) are both arranged on the connecting frame (22). The sliding frame (25) is arranged on the connecting frame (22) and is in sliding fit with the connecting frame (22). A plurality of the hard rock detection assemblies (30) are arranged side by side on the sliding frame (25) in the width direction of the vehicle body (10). The second drive unit (24) drives the sliding frame (25) to move. The second drive unit (24) is electrically connected to the control unit. When the hard rock detection assembly (30) comes into contact, the second drive unit (24) drives the sliding frame (25) to move away from the hard rock.

6. The brush cutter according to claim 5, wherein, The hard rock detection assembly (30) includes a support rod (35). The brush cutting device (20) further includes a guide cylinder (23). The guide cylinder (23) is arranged on the connecting frame (22). One end of the detection rod (31) is telescopically arranged on the sliding frame (25). The telescopic direction of the detection rod (31) is the length direction of the vehicle body (10). The other end of the detection rod (31) passes through the guide cylinder (23) and is in limit fit with the guide cylinder (23) in the radial direction. The support rod (35) is rotatably arranged on the detection rod (31). The support rod (35) has a protection position and a strengthening position. In the strengthening position, the detection rod (31) is parallel to the support rod (35). In the protection position, the detection rod (31) is perpendicular to the support rod (35), and the height of the support rod (35) from the ground is less than the height of the brush cutting knife (21) from the ground.

7. The brush cutter according to claim 6, characterized in that, The detection rod (31) has a groove (311), the opening direction of the groove (311) faces the ground, the hard stone detection assembly (30) further includes a rotating shaft and a torsion spring, the support rod (35) is located in the groove (311), the rotating shaft is arranged on the inner wall of the groove (311), the support rod (35) is rotatably connected to the detection rod (31) through the rotating shaft, one end of the torsion spring is connected to the support rod (35), and the other end of the torsion spring is connected to the inner wall of the groove (311).

8. The brush cutter according to claim 1, characterized in that, The brush cutter device (20) further includes a transmission mechanism, and the first driving part drives the brush cutter (21) to rotate through the transmission mechanism.

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