Hole digging machine for fruit tree planting

Abstract

The invention discloses a hole digging machine for fruit tree planting. Comprising a tractor body, a first mounting frame, a vertical spline shaft capable of vertically moving downwards and rotating, a ground drilling rod, an auger piece, a spline sleeve in shaft connection with the first mounting frame, a transmission mechanism, a second mounting frame and a sliding ring. The intercepting barrel and the spline shaft are coaxially arranged, the opening end of the intercepting barrel faces downwards, the elastic connecting mechanisms are used for pushing the intercepting barrel to move upwards, a circular through groove is formed in the top of the intercepting barrel, at least one first limiting block is arranged at the top of the intercepting barrel, and a second limiting block is assembled at the top of the earth drilling rod; at least one digging piece is assembled at the bottom of an opening of the intercepting barrel, the intercepting barrel can intercept scattered soil, so that the soil is gathered together, soil filling is facilitated during planting, a second connecting block drives the intercepting barrel to rotate and meanwhile drives the intercepting barrel to move downwards, an annular groove is dug in the ground, the annular groove can intercept water, and the water can be dug out conveniently. Irrigation water is prevented from flowing away from fruit trees.

Description

Technical Field

[0001] The invention relates to the technical field related to fruit tree planting, and in particular to a hole digging machine for fruit tree planting. Background Art

[0002] The pit digger is a special machine for quickly digging pits for afforestation and fertilization in mountainous areas, hills, and gullies. The pit digger frees people from heavy physical labor and is widely used in afforestation, fruit forests, fences, and fertilizing fruit trees in autumn. It has strong power, low labor intensity, is suitable for various terrains, and has high efficiency.

[0003] my country's utility model patent application number CN201721432179.3, "A new type of towed rapid hole digging machine for forest and orchards", discloses a new type of towed rapid hole digging machine for forest and orchards. By cooperating with an agricultural tractor and a drilling device, the work intensity can be further reduced, and the hole digging work efficiency is high. However, this patent still has the following shortcomings: under the action of the auger, the soil produced by digging holes will scatter, which is not conducive to soil backfilling during fruit tree planting, and the soil at the backfill after planting will be higher than the ground, and water will easily flow around during irrigation. Therefore, it is necessary to design a hole digging machine for fruit tree planting. Summary of the invention

[0004] In view of the above technical problems, the purpose of the present invention is to overcome the problems in the prior art that soil is scattered when digging holes, which is not conducive to soil backfilling during planting, and water is easy to flow around during irrigation after planting.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a fruit tree planting hole digging machine, comprising: a tractor body, a first mounting frame mounted on the rear end of the tractor body, a vertical rotatable spline shaft mounted on the first mounting frame and capable of vertically moving downward, a drilling rod fixedly connected to the bottom of the spline shaft coaxially, an auger piece fixedly welded to the outside of the drilling rod, a spline sleeve sleeved on the spline shaft and axially connected to the first mounting frame, a transmission mechanism mounted on the first mounting frame and having two ends respectively connected to the output shaft and the spline sleeve of the tractor body, a second mounting frame mounted on the rear end of the tractor body and located below the first mounting frame, a sliding ring arranged coaxially with the spline shaft and slidably mounted on the second mounting frame, an intercepting cylinder arranged coaxially with the spline shaft and with an open end facing downward, and a plurality of groups of elastic connecting mechanisms all mounted on the sliding ring for pushing the intercepting cylinder to move upward;

[0006] A circular through groove for the auger piece to pass through is coaxially disposed on the top of the intercepting cylinder, at least one first limit block is disposed on the top of the intercepting cylinder, a second limit block capable of contacting the side wall of the first limit block is provided on the top of the drilling rod, and at least one excavating piece is provided on the open bottom of the intercepting cylinder.

[0007] Preferably, the horizontal cross-section of the digging member is V-shaped, and the tip of the digging member is arranged toward the rotation direction of the intercepting cylinder.

[0008] Preferably, the elastic connection mechanism includes a connecting frame fixedly connected to the intercepting cylinder, a vertical sliding arm fixedly connected to the sliding ring, a sliding sleeve provided on the sliding arm and fixedly connected to the connecting frame, a limiting ring assembled on the top of the sliding arm, and a spring provided on the sliding arm and the upper end of which is in contact with the sliding sleeve.

[0009] Preferably, a vertical driving mechanism is arranged at the top of the first mounting frame, and the vertical driving mechanism comprises a first connecting seat fixedly connected to the first mounting frame, a second connecting seat axially connected to the top of the spline shaft, a horizontal connecting arm fixedly connected to the second connecting seat in the middle, and a pair of driving components symmetrically distributed in the horizontal direction about the spline shaft and connected to the first connecting seat, and the two ends of the connecting arm are respectively connected to a pair of driving components.

[0010] Preferably, the driving member includes a first movable arm whose inclined upper end is connected to the first connecting seat through a horizontal rotating shaft, a second movable arm whose inclined upper end is hinged to the inclined lower end of the first movable arm, and a driving push rod assembled on the first mounting frame through a hinged seat and the movable rod is hinged to the middle part of the first movable arm, and the inclined lower end of the second movable arm is hinged to the end of the connecting arm.

[0011] Preferably, a gear coaxially arranged with the rotating shaft is mounted on the inclined upper end of the first movable arm, and the two gears on a pair of first movable arms are meshed with each other.

[0012] Preferably, the transmission mechanism includes a first transmission shaft connected to the output shaft of the tractor body through a first universal coupling and a horizontal second transmission shaft assembled on a first mounting frame through a plurality of shaft seats, the end of the first transmission shaft away from the first universal coupling is connected to the second transmission shaft through a second universal coupling, and the end of the second transmission shaft away from the first transmission shaft is connected to a spline sleeve through a pair of bevel teeth.

[0013] Preferably, the second mounting frame is equipped with an annular sliding seat coaxially arranged with the sliding ring, and the sliding ring is equipped with a plurality of sliding members evenly distributed along the circumferential direction and all slidably connected with the annular sliding seat.

[0014] Preferably, the drilling rod comprises a hollow rod-like member and a conical head detachably connected to the lower end of the rod-like member, and the auger piece comprises a first auger piece fixedly mounted on the outside of the rod-like member and a second auger piece fixedly mounted on the outside of the conical head.

[0015] Preferably, the top of the conical head is recessed with a special-shaped groove, the bottom of the rod-shaped member is provided with a special-shaped protrusion matching the special-shaped groove, the outer wall of the conical head is recessed with a countersunk hole connected to the special-shaped groove, and a mounting bolt threadedly connected to the special-shaped protrusion is inserted into the countersunk hole.

[0016] According to the above technical solution, the present invention provides a fruit tree planting hole digging machine, which has the following beneficial technical effects compared with the prior art:

[0017] First, the lower end of the drilling rod is driven to contact the ground to dig a hole. The excavated soil will scatter, and the interception tube can intercept the scattered soil and gather the soil together to facilitate filling when planting;

[0018] Secondly, when digging holes, the interception cylinder rotates and moves downward, so that the digging piece contacts the ground and digs an annular groove on the ground. When watering after planting, the annular groove can intercept water and prevent the irrigation water from flowing away from the fruit trees.

[0019] Thirdly, in the absence of external force, the elastic connection mechanism will push the bottom of the digging piece above the ground, so as to facilitate the movement of the tractor body and avoid the problem of the digging piece rubbing against the ground during the movement of the tractor body.

[0020] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation mode; and the parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a three-dimensional structural schematic diagram of a fruit tree planting hole digging machine provided by the present invention;

[0023] Figure 2 This is a partial three-dimensional structure diagram of a fruit tree planting hole digging machine provided by the present invention Figure 1 ;

[0024] Figure 3 This is a partial three-dimensional structure diagram of a fruit tree planting hole digging machine provided by the present invention Figure 2 ;

[0025] Figure 4 The invention provides a fruit tree planting hole digging machine. Figure 2 The enlarged schematic diagram of point A in the middle;

[0026] Figure 5The invention provides a fruit tree planting hole digging machine. Figure 2 The enlarged schematic diagram of point B in the middle;

[0027] Figure 6 This is a partial three-dimensional structure diagram of a fruit tree planting hole digging machine provided by the present invention Figure 3 ;

[0028] Figure 7 The utility model is a partially exploded schematic diagram of a fruit tree planting hole digging machine provided by the present invention.

[0029] Description of Reference Numerals

[0030] 1. Tractor body; 2. First mounting frame; 3. Spline shaft; 4. Drilling rod; 5. Auger piece; 6. Spline sleeve; 7. Second mounting frame; 8. Sliding ring; 9. Interceptor tube; 10. First stop block; 11. Second stop block; 12. Digging piece; 13. Connecting frame; 14. Sliding arm; 15. Sliding sleeve; 16. Stop ring; 17. Spring; 18. First connecting seat; 19. Second connecting seat; 20. Connecting arm; 21. Rotating shaft ; 22. First movable arm; 23. Second movable arm; 24. Driving push rod; 25. Gear; 26. First universal joint; 27. First transmission shaft; 28. Second transmission shaft; 29. ​​Second universal joint; 30. Bevel gear; 31. Annular slide; 32. Rod-shaped member; 33. Conical head; 34. First auger piece; 35. Second auger piece; 36. Special-shaped groove; 37. Special-shaped protrusion; 38. Countersunk hole; 39. Mounting bolt. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0032] In the present invention, unless otherwise stated, directional words such as "upper, lower, inside, outside" contained in a term merely represent the orientation of the term in normal usage, or are common names understood by those skilled in the art, and should not be regarded as limitations on the term.

[0033] like Figure 1-7As shown, a fruit tree planting hole digging machine comprises: a tractor body 1, a first mounting frame 2 mounted on the rear end of the tractor body 1, a vertical rotatable spline shaft 3 mounted on the first mounting frame 2 and capable of vertically moving downward, a drilling rod 4 fixedly connected to the bottom of the spline shaft 3 coaxially, an auger piece 5 fixedly welded to the outside of the drilling rod 4, a spline sleeve 6 sleeved on the spline shaft 3 and axially connected to the first mounting frame 2, a transmission mechanism mounted on the first mounting frame 2 and having two ends respectively connected to the output shaft and the spline sleeve 6 of the tractor body 1, a second mounting frame 7 mounted on the rear end of the tractor body 1 and located below the first mounting frame 2, a sliding ring 8 arranged coaxially with the spline shaft 3 and slidably mounted on the second mounting frame 7, an intercepting cylinder 9 arranged coaxially with the spline shaft 3 and having an open end facing downward, and a plurality of groups of elastic connecting mechanisms all mounted on the sliding ring 8 for pushing the intercepting cylinder 9 to move upward;

[0034] A circular through groove for the auger piece 5 to pass through is coaxially disposed on the top of the intercepting cylinder 9, at least one first limit block 10 is disposed on the top of the intercepting cylinder 9, a second limit block 11 capable of contacting the side wall of the first limit block 10 is provided on the top of the drilling rod 4, and at least one excavation piece 12 is provided on the open bottom of the intercepting cylinder 9.

[0035] In the above technical solution, when it is necessary to dig a hole on the ground, the output shaft on the tractor body 1 drives the spline sleeve 6 to rotate through the transmission mechanism, the spline sleeve 6 drives the spline shaft 3 to rotate, the spline shaft 3 drives the drilling rod 4 and the auger piece 5 to rotate, and then the spline shaft 3 moves vertically downward, driving the lower end of the drilling rod 4 to contact the ground to dig a hole, and the excavated soil will scatter. The function of the interception cylinder 9 is to intercept the scattered soil and make the soil gather together for filling when planting;

[0036] During the process of the drilling rod 4 digging a hole downward, the second limit block 11 will move downward and contact the side wall of the first limit block 10, and the second limit block 11 will push the intercepting cylinder 9 to rotate through the first limit block 10. After the second limit block 11 moves downward and contacts the top of the intercepting cylinder 9, while driving the intercepting cylinder 9 to rotate, it will also drive the intercepting cylinder 9 to move downward, so that the excavating piece 12 contacts the ground and digs an annular groove on the ground. When watering after planting, the annular groove can intercept water to prevent the irrigation water from flowing away from the fruit trees.

[0037] In the absence of external force, the elastic connection mechanism will push the bottom of the digging member 12 above the ground, so as to facilitate the movement of the tractor body 1 and avoid the problem of the digging member 12 rubbing against the ground during the movement of the tractor body 1.

[0038] In a preferred embodiment of the present invention, the horizontal cross-section of the digging member 12 is V-shaped, and the tip of the digging member 12 is arranged toward the rotation direction of the intercepting cylinder 9.

[0039] In the above technical solution, the digging piece 12 with a V-shaped horizontal cross section is conducive to digging an annular groove on the ground.

[0040] In a preferred embodiment of the invention, the elastic connecting mechanism includes a connecting frame 13 fixedly connected to the intercepting cylinder 9, a vertical sliding arm 14 fixedly connected to the sliding ring 8, a sliding sleeve 15 slidingly sleeved on the sliding arm 14 and fixedly connected to the connecting frame 13, a limiting ring 16 assembled on the top of the sliding arm 14, and a spring 17 sleeved on the sliding arm 14 and the upper end of which is in contact with the sliding sleeve 15.

[0041] In the above technical solution, when the second limit block 11 presses the intercepting tube 9 to move downward, the sliding sleeve 15 slides downward on the sliding arm 14; when the spline sleeve 6 moves upward after the hole digging is completed, the spring 17 will push the sliding sleeve 15 to move upward on the sliding arm 14, thereby driving the intercepting tube 9 to move upward and return to its original position.

[0042] In a preferred embodiment of the invention, a vertical driving mechanism is provided on the top of the first mounting frame 2, and the vertical driving mechanism includes a first connecting seat 18 fixedly connected to the first mounting frame 2, a second connecting seat 19 axially connected to the top of the spline shaft 3, a horizontal connecting arm 20 fixedly connected to the second connecting seat 19 in the middle, and a pair of driving components symmetrically distributed in the horizontal direction about the spline shaft 3 and connected to the first connecting seat 18, and the two ends of the connecting arm 20 are respectively connected to a pair of driving components.

[0043] In the above technical solution, the vertical drive mechanism is used to drive the spline shaft 3 to move vertically, thereby driving the drilling rod 4 to move vertically. A pair of driving components drives the spline shaft 3 to move vertically by driving the connecting arm 20 and the second connecting seat 19. A pair of driving components simultaneously apply power to the connecting arm 20, which can increase the pressure applied by the drilling rod 4 on the ground, thereby improving the digging efficiency.

[0044] In a preferred embodiment of the invention, the driving component includes a first movable arm 22 whose inclined upper end is connected to the first connecting seat 18 through a horizontal rotating shaft 21, a second movable arm 23 whose inclined upper end is hinged to the inclined lower end of the first movable arm 22, and a driving push rod 24 assembled on the first mounting frame 2 through a hinged seat and the movable rod is hinged to the middle part of the first movable arm 22, and the inclined lower end of the second movable arm 23 is hinged to the end of the connecting arm 20.

[0045] In the above technical solution, the driving push rod 24 drives the first movable arm 22 to rotate downward around the rotating shaft 21, the distance between the inclined lower end of the first movable arm 22 and the axis of the spline shaft 3 is reduced, and the first movable arm 22 will push the connecting arm 20 to move downward through the second movable arm 23.

[0046] In a preferred embodiment of the invention, a gear 25 coaxially arranged with the rotating shaft 21 is mounted on the inclined upper end of the first movable arm 22, and the two gears 25 on a pair of first movable arms 22 are meshed with each other.

[0047] In the above technical solution, the synchronization rate of a pair of driving components can be improved by a pair of gears 25, so that the two ends of the connecting arm 20 are evenly stressed, which is conducive to pushing the spline shaft 3 to move downward.

[0048] In a preferred embodiment of the invention, the transmission mechanism includes a first transmission shaft 27 connected to the output shaft of the tractor body 1 through a first universal coupling 26 and a horizontal second transmission shaft 28 assembled on the first mounting frame 2 through a plurality of axle seats, the end of the first transmission shaft 27 away from the first universal coupling 26 is connected to the second transmission shaft 28 through a second universal coupling 29, and the end of the second transmission shaft 28 away from the first transmission shaft 27 is connected to the spline sleeve 6 through a pair of bevel teeth 30.

[0049] In the above technical solution, the output shaft on the tractor body 1 drives the first transmission shaft 27 to rotate through the first universal coupling 26, and then drives the second transmission shaft 28 to rotate through the second universal coupling 29. The second transmission shaft 28 drives the spline shaft 3 to rotate through a pair of bevel teeth 30 and the spline sleeve 6, so that the drilling rod 4 rotates while moving downward.

[0050] In a preferred embodiment of the invention, the second mounting frame 7 is equipped with an annular slide seat 31 coaxially arranged with the sliding ring 8 , and the sliding ring 8 is equipped with a plurality of sliding members evenly distributed along the circumferential direction and all slidably connected with the annular slide seat 31 .

[0051] In a preferred embodiment of the invention, the drilling rod 4 includes a hollow rod-shaped member 32 and a conical head 33 detachably connected to the lower end of the rod-shaped member 32, and the auger piece 5 includes a first auger piece 34 fixedly assembled on the outside of the rod-shaped member 32 and a second auger piece 35 fixedly assembled on the outside of the conical head 33.

[0052] In the above technical solution, since the lower end of the drilling rod 4 is most worn, the digging efficiency will be reduced after the lower end of the drilling rod 4 is worn. Therefore, the drilling rod 4 is divided into a rod-shaped member 32 and a conical head 33, which can not only reduce the later replacement cost, but also maintain high digging efficiency. The auger piece 5 is also divided into a first auger piece 34 and a second auger piece 35. When replacing, the conical head 33 and the second auger piece 35 are replaced at the same time.

[0053] In a preferred embodiment of the invention, the top of the conical head 33 is recessed with a special-shaped groove 36, the bottom of the rod-shaped member 32 is provided with a special-shaped protrusion 37 matching the special-shaped groove 36, and the outer wall of the conical head 33 is recessed with a countersunk hole 38 connected to the special-shaped groove 36, and a mounting bolt 39 threadedly connected to the special-shaped protrusion 37 is inserted into the countersunk hole 38.

[0054] In the above technical solution, when the conical head 33 needs to be replaced, the mounting bolt 39 is loosened and removed, and the conical head 33 can be removed by moving it downward; the special-shaped groove 36 on the new conical head 33 is sleeved on the special-shaped protrusion 37, and the mounting bolt 39 is passed through the countersunk hole 38 and screwed onto the special-shaped protrusion 37. The operation is simple and the replacement is convenient.

[0055] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0056] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0057] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A fruit tree planting hole digging machine, characterized in that: include: A tractor body (1), a first mounting frame (2) mounted on the rear end of the tractor body (1), a vertical rotatable spline shaft (3) mounted on the first mounting frame (2) and capable of vertically moving downward, a ground drilling rod (4) fixedly connected coaxially with the bottom of the spline shaft (3), a auger piece (5) fixedly welded to the outside of the ground drilling rod (4), a spline sleeve (6) sleeved on the spline shaft (3) and axially connected to the first mounting frame (2), a transmission mechanism mounted on the first mounting frame (2) and having two ends respectively connected to the output shaft of the tractor body (1) and the spline sleeve (6), a second mounting frame (7) mounted on the rear end of the tractor body (1) and located below the first mounting frame (2), a sliding ring (8) arranged coaxially with the spline shaft (3) and slidably mounted on the second mounting frame (7), an intercepting cylinder (9) arranged coaxially with the spline shaft (3) and with its open end facing downward, and a plurality of groups of elastic connection mechanisms all mounted on the sliding ring (8) for pushing the intercepting cylinder (9) to move upward; A circular through groove for the auger piece (5) to pass through is coaxially provided at the top of the intercepting cylinder (9), at least one first limit block (10) is provided at the top of the intercepting cylinder (9), a second limit block (11) capable of contacting the side wall of the first limit block (10) is provided at the top of the drilling rod (4), and at least one excavating piece (12) is provided at the bottom of the opening of the intercepting cylinder (9).

2. The fruit tree planting hole digging machine according to claim 1, characterized in that: The horizontal cross section of the digging piece (12) is V-shaped, and the tip of the digging piece (12) is arranged toward the rotation direction of the intercepting cylinder (9).

3. The fruit tree planting hole digging machine according to claim 1, characterized in that: The elastic connection mechanism comprises a connecting frame (13) fixedly connected to the intercepting cylinder (9), a vertical sliding arm (14) fixedly connected to the sliding ring (8), a sliding sleeve (15) slidingly sleeved on the sliding arm (14) and fixedly connected to the connecting frame (13), a limiting ring (16) mounted on the top of the sliding arm (14), and a spring (17) sleeved on the sliding arm (14) and with its upper end in contact with the sliding sleeve (15).

4. The fruit tree planting hole digging machine according to claim 1, characterized in that: A vertical driving mechanism is arranged at the top of the first mounting frame (2), and the vertical driving mechanism comprises a first connecting seat (18) fixedly connected to the first mounting frame (2), a second connecting seat (19) axially connected to the top of the spline shaft (3), a horizontal connecting arm (20) fixedly connected to the second connecting seat (19) in the middle, and a pair of driving components symmetrically distributed in the horizontal direction about the spline shaft (3) and connected to the first connecting seat (18), and the two ends of the connecting arm (20) are respectively connected to the pair of driving components.

5. The fruit tree planting hole digging machine according to claim 4, characterized in that: The driving member comprises a first movable arm (22) whose inclined upper end is connected to a first connecting seat (18) via a horizontal rotating shaft (21), a second movable arm (23) whose inclined upper end is hinged to the inclined lower end of the first movable arm (22), and a driving push rod (24) which is assembled on the first mounting frame (2) via a hinged seat and whose movable rod is hinged to the middle part of the first movable arm (22), and the inclined lower end of the second movable arm (23) is hinged to the end of the connecting arm (20).

6. The fruit tree planting hole digging machine according to claim 5, characterized in that: A gear (25) coaxially arranged with the rotating shaft (21) is mounted on the inclined upper end of the first movable arm (22), and the two gears (25) on a pair of first movable arms (22) are meshed with each other.

7. The fruit tree planting hole digging machine according to claim 1, characterized in that: The transmission mechanism comprises a first transmission shaft (27) connected to the output shaft of the tractor body (1) through a first universal coupling (26) and a horizontal second transmission shaft (28) mounted on a first mounting frame (2) through a plurality of shaft seats, wherein the end of the first transmission shaft (27) away from the first universal coupling (26) is connected to the second transmission shaft (28) through a second universal coupling (29), and the end of the second transmission shaft (28) away from the first transmission shaft (27) is connected to a spline sleeve (6) through a pair of bevel teeth (30).

8. The fruit tree planting hole digging machine according to claim 1, characterized in that: The second mounting frame (7) is equipped with an annular sliding seat (31) coaxially arranged with the sliding ring (8), and the sliding ring (8) is equipped with a plurality of sliding members evenly distributed along the circumferential direction and all slidably connected to the annular sliding seat (31).

9. The fruit tree planting hole digging machine according to claim 1, characterized in that: The drilling rod (4) comprises a hollow rod-shaped member (32) and a conical head (33) detachably connected to the lower end of the rod-shaped member (32); the auger piece (5) comprises a first auger piece (34) fixedly mounted on the outside of the rod-shaped member (32) and a second auger piece (35) fixedly mounted on the outside of the conical head (33).

10. The fruit tree planting hole digging machine according to claim 9, characterized in that: The top of the conical head (33) is recessed with a special-shaped groove (36), the bottom of the rod-shaped member (32) is provided with a special-shaped protrusion (37) matching the special-shaped groove (36), the outer wall of the conical head (33) is recessed with a countersunk hole (38) connected with the special-shaped groove (36), and a mounting bolt (39) threadedly connected to the special-shaped protrusion (37) is inserted into the countersunk hole (38).

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