Root removal device

Abstract

This prevents the device from being damaged by impacts from solid objects in the ground. [Solution] The device comprises a drum member 61 that moves up and down while rotating in forward and reverse directions to bite into the ground around the stump, and a cutter member 70 that is attached to the lower end of the drum member 61 at a distance to cut the lateral roots of the stump. Block reinforcement 63 that bites into the ground and loosens it as the drum member 61 rotates is provided on the inner and / or outer surface of the drum member 61 in close proximity to the cutter member, with the block reinforcement 63 extending in the vertical direction. The cutter member 70 comprises an arm member 71 that hangs down from the drum member and is tiltable in the opposite direction of rotation of the drum member, a cutter blade 72 attached to the arm member 71 so as to be located on the positive rotation side of the drum member, and a receiving member 73 that hangs down from the drum member so as to face the arm member on the opposite rotation side of the drum member and receives the tilting of the arm member.

Description

Technical Field

[0001] The present invention relates to a stump removal device for removing stumps of trees including roadside trees.

Background Art

[0002] After trees such as roadside trees are cut down, stumps remain buried in the ground, so it is necessary to remove the stumps from the ground. To remove the stumps, the ground around the stumps is dug. As a conventional stump removal device for such stump removal, Patent Document 1 is disclosed.

[0003] Figs. 8 to 10 show a conventional stump removal device 1 disclosed in Patent Document 1. As shown in Fig. 8, the entire stump removal device 1 is detachably attached to a self-propelled heavy machine 100 such as a bulldozer, and is used for removing the stump 9 in the attached state to the self-propelled heavy machine 100. The self-propelled heavy machine 100 moves the entire stump removal device 1 to the work place. The operator controls the operation of the stump removal device 1 by an operation from the self-propelled heavy machine 100. The operation of the stump removal device 1 is performed by power such as hydraulic pressure supplied from the self-propelled heavy machine 100. The stump removal device 1 has a frame member 2, a drum member 3, a cutter member 4, a lifting drive means 6, and a rotation drive means 7. The lifting drive means 6 raises and lowers the drum member 3, and the rotation drive means 7 rotates the drum member 3 in the forward and reverse directions in the X direction and the Y direction (see Fig. 9).

[0004] The frame member 2 is formed in a vertically long cylindrical shape with a square cross section and extends in the vertical direction. A connecting bracket 10 is attached to a side surface portion of the frame member 2, and this connecting bracket 10 is attached to an arm 110 of the self-propelled heavy machine 100 in a non-rotating state. The self-propelled heavy machine 100 includes an adjustment cylinder 120 in addition to the arm 110, and the connecting bracket 10 of the frame member 2 is also connected to this adjustment cylinder 120. Therefore, by expanding and contracting the adjustment cylinder 120, the posture and angle of the stump removal device 1 can be adjusted. The self-propelled heavy machine 100 can move the entire stump removal device 1 up and down via the frame member 2 connected to the arm 110 and the adjustment cylinder 120. Therefore, the self-propelled heavy machine 100 also serves as the lifting drive means 6 for the stump removal device 1, and in this case, the lifting drive means 6 can be omitted.

[0005] As shown in Figure 9, the lifting drive means 6 is formed by a lifting cylinder 20 made of a hydraulic cylinder and a lifting frame 19 connected to the lifting cylinder 20. The lifting cylinder 20 is positioned inside the frame member 2 facing vertically, and its upper end is fixed to the top of the frame member 2 by bolts or the like, and in this fixed state it hangs down inside the frame member 2. The lifting frame 19 is a cylindrical shape with a square cross-section similar to the frame member 2 and is inserted inside the frame member 2, and the rotation of the lifting frame 19 is thus constrained by the frame member 2. The lifting frame 19 has a connecting plate 22 in the middle of its length, and this connecting plate 22 is connected to the piston 21 of the lifting cylinder 20. As a result when the lifting cylinder 20 extends and retracts, the lifting frame 19 moves vertically in accordance with the extension and retraction of the lifting cylinder 20, and the drum member 3 descends and rises.

[0006] The rotary drive means 7 is formed by a rotary motor 25, which is a hydraulic motor, and a gear train that transmits the rotational force of the rotary motor 25 to the drum member 3. The drum member 3 is detachably attached to the rotary drive means 7 by bolts and rotates in forward and reverse directions when driven by the rotary motor 25.

[0007] The drum member 3 digs into the ground 8 surrounding the root stump 9 while excavating the ground. The drum member 3 has a cylindrical drum body 11 made of a metal material with high strength and corrosion resistance, such as stainless steel. Because the drum body 11 is formed in a cylindrical shape, soil and sand during excavation enter the drum body 11 through the opening at the lower end. Multiple windows 12 are formed in the upper part of the drum body 11, allowing the soil and sand that have entered the drum body 11 to be discharged to the outside. This allows for continuous excavation. A cutter member 4 is attached to the lower end of the drum member 3.

[0008] The cutter member 4 is a member that cuts the lateral roots 9a of the root stump 9 and is attached to the lower end of the drum member 3 (drum body portion 11). Multiple cutter members 4 are attached to the lower end of the drum member 3 at predetermined intervals along the circumferential direction of the member 3.

[0009] As shown in Figure 10, each cutter member 4 comprises a bracket member 41 attached to the lower end of the drum member 3 at a distance from each other, an arm member 42 tiltably attached to the bracket member 41, a cutter blade 43 attached to the arm member 42, and a biasing member 44 that biases the arm member 42.

[0010] The bracket member 41 clamps the lower end of the drum member 3 from both sides, and is fixed to the lower end of the drum member 3 by screwing in the bolt 45 in this clamped state. The arm member 42 is tiltably attached to the bracket member 41. The upper part of the arm member 42 is rotatably attached to a support shaft 46 fixed to the longitudinal end of the bracket member 41, so that it hangs down from the bracket member 41. This attachment allows the arm member 42 to tilt relative to the bracket member 41.

[0011] The cutter blade 43 is fixed to the lower part of the arm member 42 by a bolt. The cutter blade 43 has a cutting edge at its tip, which cuts the lateral roots 9a of the root stump 9. The entire rear end of the cutter blade 43 is in contact with the arm member 42, so the entire blade is supported by the arm member 42. The cutter blade 43 is attached to the arm member 42 such that the blade portion faces the positive rotation direction X of the drum member 3. As the drum member 3 rotates in the positive rotation direction X, the cutter blade 43 cuts the lateral roots 9a of the rootstock 9.

[0012] The biasing member 44 presses against the arm member 42 to prevent the cutter blade from retracting when the drum member 3 rotates in the positive rotation direction X to excavate the ground, and also biases the arm member 42 to return to its original position when it tilts. The biasing member 44 is formed by a coil spring 50. A bolt shaft 51 that passes through the coil spring 50 and a clamping member 49 that faces the arm member 42 are arranged. The bolt shaft 51 is stretched between the arm member 42 and the clamping member 49 and supports the expansion and contraction movement of the coil spring 50. When the arm member 42 tilts in the opposite direction Y to the positive rotation direction X of the drum member 3, the coil spring 50 shortens, and this shortening stores spring force, elastically biasing the arm member 42 to return to its original position.

[0013] In this type of stump removal device 100, the self-propelled heavy machinery 100 is moved to position the stump removal device 1 over the target stump 9. Then, the drum member 3 is rotated in the positive rotation direction X by the rotation drive means 7, while the drum member 3 is lowered by the lifting drive means 6. This causes the drum member 3 to excavate the ground 8 around the stump 9. In addition, the rotation of the drum member 3 causes the cutter member 4 to cut the lateral roots 9a of the stump 9. After that, the stump 9 is lifted up by the heavy machinery 100 or by human power. [Prior art documents]

[0014] [Patent Document 1] Patent No. 6691332 [Overview of the project] [Problems that the invention aims to solve]

[0015] However, in conventional structures, the rotation of the drum member 3 causes the soil in the ground to compact and harden, creating significant resistance to the rotation of the drum member 3. This prevents the drum member 3 from rotating smoothly, hindering the cutting of lateral roots and penetration into the ground by the cutter member 4. In this case, a large load is placed on the rotational drive means 7 that rotates the drum member 3 and the heavy machinery 100 that serves as the power source, which can cause damage to them. Furthermore, in the conventional structure, a bracket member 41 is required to attach the arm member 42, the biasing member 44, and the clamping member 49. As a result, the total number of parts in the cutter member 4 is large, the structure is complex, and assembly is troublesome.

[0016] This invention was made in consideration of the problems of such conventional structures, and aims to provide a root stump removal device that prevents the soil from becoming dense and simplifies the structure of the cutter member. [Means for solving the problem]

[0017] The stump removal device of the present invention comprises a drum member that moves up and down while rotating in forward and reverse directions and bites into the ground around the stump, and a cutter member that is attached to the lower end of the drum member at a distance and cuts the lateral roots of the stump, wherein a block reinforcing bar that bites into the ground and loosens the ground as the drum member rotates is provided on the inner surface and / or outer surface of the drum member in close proximity to the cutter member with the vertical extension, and the cutter member comprises an arm member that hangs down from the drum member and is tiltable in the opposite direction of rotation of the drum member, a cutter blade attached to the arm member so as to be located on the positive rotation side of the drum member, and a receiving member that hangs down from the drum member so as to face the arm member on the opposite rotation side of the drum member and receives the tilting of the arm member.

[0018] In the present invention, it is characterized in that a cushion member that receives and repels the load of the arm member is attached to the arm member side of the receiving member. Further, the block ribs are provided on the drum member in a freely rotatable state, which is characterized. Further, the block ribs are provided in a fixed state to the drum member, which is characterized. Further, the cutter blade is attached at an inclination with respect to the length direction of the arm member, which is characterized. Further, the cutter blade is attached to the arm member with its corner portion at the lowest position, which is characterized. Further, the receiving member hangs down from the drum member in a vertical state or an inclined state, which is characterized.

Advantages of the Invention

[0019] According to the present invention, the block ribs provided at a position close to the cutter member on the inner surface and / or outer surface of the drum member loosen the soil of the ground by the rotation of the drum member, so that it is possible to prevent the soil of the ground from solidifying densely and becoming hard, reduce the resistance of the ground to the drum member, and reduce the large load on the rotation driving means of the drum member and the heavy machine.

[0020] Further, since the block ribs are provided at a position close to the cutter member, the soil of the ground around the cutter member is loosened, so that it becomes easy for the cutter member to bite into the ground and cut lateral roots. Therefore, a simple structure in which the cutter member is directly attached to the arm member and the receiving member is attached to the drum member can be adopted, and a bracket member as in the conventional structure is not required, so that a structure with a small number of parts can be achieved.

Brief Description of the Drawings

[0021] [Figure 1] It is a front view of the drum member in the rootstock removing device of one embodiment of the present invention. [Figure 2] It is a bottom view of the drum member. [Figure 3](A) and (B) are side view and front view of the arm member. [Figure 4] (A) and (B) are side view and front view of the receiving member. [Figure 5] (A) to (C) are front views showing the arm member, the receiving member, and a modified example of the arm member. [Figure 6] Front view of the drum member of another embodiment of the present invention. [Figure 7] Front view of the arm member used in FIG. 6. [Figure 8] Front view of attaching a conventional rootstock removing device to a self-propelled heavy machine. [Figure 9] Front view showing the whole conventional rootstock removing device. [Figure 10] Front view of the drum member used in the conventional rootstock removing device.

Mode for Carrying Out the Invention

[0022] FIGS. 1 to 4 show an embodiment of the present invention. This rootstock removing device 60 is different from the conventional rootstock removing device shown in FIGS. 8 and 9 in that the drum member 61 and the cutter member 70 attached to the drum member 61 are different, and other constituent members are the same as those of the conventional rootstock removing device. For this reason, the same members as those of the conventional rootstock removing device are denoted by the same reference numerals for correspondence.

[0023] As shown in FIGS. 1 and 2, the rootstock removing device 60 is such that the drum member 61 moves up and down while rotating in the forward and reverse directions of X and Y, and includes the same lifting drive means 6 and rotation drive means 7 as in the conventional case, and is attached to the self-propelled heavy machine 100 to remove the rootstock (see FIGS. 8 and 9). The drum member 61 digs into the ground 8 around the rootstock 9 while digging the ground, and as shown in FIGS. 8 and 9, the rotation drive means 7 is attached to the top, and the top is connected to the lifting drive means 6.

[0024] The drum member 61 is formed in a cylindrical shape with an open lower end, using a high-strength metal material such as stainless steel, and has multiple openings 62 for releasing soil and sand. The lower end portion 61a of the drum member 61 is formed in a straight line. The drum member 61 bites into the ground 8 by rotating in the positive rotational direction X, thereby excavating the ground. Multiple large-diameter holes 65 are formed in the drum member 61. Forming the holes 65 makes the drum member 61 lighter. The holes 65 may be omitted if not necessary.

[0025] Multiple reinforcing bars 63 are provided in the drum member 61. The reinforcing bars 63 are formed from vertically elongated block-shaped reinforcing bars such as cylinders or prisms, or stainless steel reinforcing bars. The reinforcing bars 63 are positioned close to the cutter member 70, which will be described later, and extend in the vertical direction. The reinforcing bars 63 only need to extend in the vertical direction, and may also be inclined at an angle. In the illustrated configuration, the reinforcing bars 63 are provided on the outer and inner surfaces of the drum member 61. However, the reinforcing bars 63 may be provided on either the outer or inner surface of the drum member 61, as long as they are in close proximity to the cutter member 70.

[0026] In this configuration, the reinforcement blocks 63 are supported at their upper and lower ends by bearings 66 provided on the drum member 61, allowing them to rotate freely. Because they are able to rotate freely, when they come into contact with the soil, the contact pressure causes the reinforcement blocks 63 to rotate, thus disturbing the soil and effectively loosening it. In this case, the structure is not limited to bearings 66; it could simply be a support bracket into which the reinforcement blocks 63 are freely inserted for rotation.

[0027] The multiple reinforcing blocks 63 act to bite into the ground as the drum member 61 rotates. As the reinforcing blocks 63 bite into the ground, they act to loosen the soil. This prevents the soil from becoming dense and hardened as the drum member 61 rotates, and reduces the ground's resistance to the rotation of the drum member 61. This allows the drum member 61 to easily bite into the ground. In addition, because the reinforcing blocks 63 are positioned close to the cutter member 70, they loosen the soil near the cutter member 70, allowing the cutter member 70 to easily bite into the ground and easily cut lateral roots. These factors reduce the load on the rotational drive means 7 and the heavy machinery 100 that powers it, preventing damage to them.

[0028] Multiple cutter members 70 are attached to the lower end portion 61a of the drum member 61 at predetermined intervals in the circumferential direction (for example, at 8 locations). Each cutter member 70 has an arm member 71, a cutter blade 72, and a receiving member 73.

[0029] The arm members 71 are attached to the drum member 61 in a state where they hang down from the lower end 61a of the drum member 61. Each arm member 71 is attached to the drum member 61 by bolts 74, sandwiching the lower end 61a of the drum member 61, and can tilt in the opposite rotational direction Y if excessive pressure is applied from the ground 8. In the arm member 71 shown in Figure 1, it hangs down from the drum member 61 in a shape that extends straight downward from the drum member 61. However, the hanging of the arm member 71 from the drum member 61 may be tilted to some extent in the forward and reverse rotational directions X and Y.

[0030] The cutter blade 72 is fixed to the lower part of each arm member 71 by bolts 75. The cutter blade 72 has a recessed, sharp cutting edge 72a formed on the positive rotation direction X side, and as the drum member 61 rotates in the positive rotation direction X, the cutter blade 72 cuts the lateral roots 9a of the root stump 9 while digging into the ground. The outer shape of the cutter blade 72 may be square, circular, or any other shape.

[0031] As shown in Figures 1 and 3, the entire cutter blade 72 is mounted at an angle with respect to the length of the arm member 71. This causes the cutting edge 72a of the cutter blade 72 to be tilted, and ground excavation is performed in this state. Because the cutter blade 72 is tilted, the cutting edge 72a bites into the ground at an angle, making ground excavation and cutting of lateral roots 9a easier.

[0032] The receiving member 73 is fixed to the lower end 61a of the drum member 61 so as to be positioned on the opposite side of the rotational direction Y relative to each arm member 71. In other words, the receiving member 73 is fixed to the drum member 61 so as to face the arm member 71 on the back side of each arm member 71. As a result, the receiving member 73 acts to absorb the tilting of the arm member 71 in the opposite rotational direction Y.

[0033] The receiving member 73 is made of a high-strength material such as iron or stainless steel and is fixed to the lower end 61a of the drum member 61 in a vertically hanging position. The receiving member 73 is fixed to the drum member 61 by welding or by fastening with two or more bolts, and is firmly fixed to the drum member 61. This prevents the receiving member 73 from bending or deforming, so that it can reliably withstand the tilting of the arm member 71.

[0034] As shown in Figures 1 and 4, a cushion member 76 is fixed to the arm member 71 side of each receiving member 73 by bolts 77. The cushion member 76 is made of a cushioning material such as rubber, elastic resin, or spring. A spring 78 is placed inside the cushion member 76, but the spring 78 can be omitted. If the spring 78 is omitted, a simple mounting structure can be used in which the cushion member 76 is directly bonded or welded to the receiving member 73.

[0035] When the arm member 71 tilts in the opposite rotational direction Y, the arm member 71 comes into contact with the cushion member 76. As a result, the cushion member 76 absorbs the pressing force caused by the tilting of the arm member 71, thereby reducing the pressing force of the arm member 71 acting on the receiving member 73. Therefore, the receiving member 73 can more reliably receive the arm member 71, and the cutter member 70 can reliably penetrate the ground 8 and cut the lateral roots. Here, the receiving member 73 only needs to be capable of receiving the tilting of the arm member 71, and if it can reliably receive the tilting of the arm member 71, the cushioning member 76 can be omitted.

[0036] In the embodiments of the present invention shown in Figures 1 to 4 above, the block reinforcement 63 provided in close proximity to the cutter member on the inner and / or outer surface of the drum member 61 loosens the soil of the ground as the drum member 61 rotates, thereby reducing the resistance of the ground to the drum member 61 and facilitating the cutting of the cutter member 70 into the ground and the cutting of lateral roots. As a result of this ease of cutting of the cutter member 70 into the ground and the cutting of lateral roots, the cutter member 70 can be made into a simple structure in which the arm member 71 and the receiving member 73 are directly attached to the drum member 61, eliminating the need for bracket members as in conventional structures, thus resulting in a structure with fewer parts.

[0037] Figure 5 shows a modified example of this embodiment. Figure (A) shows the state in which the arm member 71 is attached to the drum member 61, and the arm member 71 is attached to the drum member 61 at an angle α in the opposite rotational direction Y. The angle α is set to about 18 to 22°. By attaching it at this angle, the cutter blade 72 of the arm member 71 is also tilted in the same way, and the side roots can be cut well. Figure (B) shows the receiving member 73 attached to the drum member 61 at a certain angle. This tilt allows the entire cushioning member 76 of the receiving member 73 to receive the tilting of the arm member 71, thereby effectively receiving the load from the arm member 71. Figure (C) shows a cutter blade 73 attached to the arm member 71. The cutter blade 73 is rectangular in shape and is attached to the arm member 71 so that the corner portion 73a is at the lowest position. By having the corner portion 73a at the lowest position, the blade becomes thinner, and the corner portion 73a bites into the root stumps and lateral roots that extend laterally from the ground, so that they can be cut reliably.

[0038] Figure 6 is a front view of the drum member 61 in another embodiment of the present invention, and Figure 7 is a front view of the cutter member 71 used in the drum member 61.

[0039] In this configuration as well, block reinforcement bars 63 are provided on the inner and / or outer surfaces of the drum member 61 in close proximity to the cutter member 70, so that the rotation of the drum member 61 loosens the soil in the ground. This reduces the resistance of the ground to the drum member 61 and facilitates the cutting of the cutter member 70 into the ground and the cutting of lateral roots.

[0040] In this configuration, the reinforced concrete blocks 63 are fixed to the drum member 61 by welding or bolting. By fixing them to the drum member 61 in this way, the reinforced concrete blocks 63 are firmly fixed and come into contact with the soil of the ground, thereby reliably loosening the soil of the ground.

[0041] In this configuration, the lower end portion 61a of the drum member 61 is formed in a continuous corrugated shape. This allows the cutter member 70 at the lower end portion 61a of the drum member 61 to contact the roots or ground at the moment of displacement, preventing simultaneous contact with both the roots and ground. As a result, large torque is not required for cutting the roots or excavating the ground.

[0042] In this configuration, the receiving member 73 is fixed to the drum member 61 at a slight inclination toward the opposite rotation direction Y, and is designed to receive the arm member 71 in this inclined state. When the arm member 71 tilts toward the opposite rotation direction Y due to resistance from the ground (i.e., the arm member 71 moves away in the opposite rotation direction Y) and comes into contact with the receiving member 73, the pressing force from the contact of the arm member 71 acts on the receiving member 73 as a component force corresponding to the inclination angle of the receiving member 73. As a result, a small pressing force acts on the receiving member 73. This ensures that the receiving member 73 reliably receives the tilting of the arm member 71, preventing the arm member 71 from tilting and moving away more than necessary, ensuring that the cutter member 70 bites into the ground and enabling the cutting of lateral roots.

[0043] Furthermore, some of the arm members 71 have a shape in which the lower side is bent outward from the drum member 61, as shown in Figure 7. In other words, some of the arm members 71 have a bent portion 81 that is bent outward, and excavate the ground while protruding further outward from the drum member 61 than the other arm members 71 that hang vertically. By providing the drum member 61 with a mixture of arm members 71 having this bent portion 81 and other arm members that hang vertically from the drum member 61, the excavation positions are different, allowing for a wider penetration into the ground and a wider range of root removal. [Explanation of Symbols]

[0044] 6. Lifting and lowering drive mechanism 7 Rotary drive means 8 Ground 9 Rootstock 9a Lateral root 60 Root removal device 61 Drum components 62 Window section 63 Block muscles 66 bearings 70 Cutter parts 71 Arm member 72 cutter blades 73 Receiving member 76 Cushioning material 81 Bent part X is the positive direction of rotation. Y: Opposite rotation direction

Claims

1. A drum-like component that rotates in both forward and reverse directions while moving up and down, digging into the ground around the root stump, The drum member is attached at a distance from the lower end of the drum member and includes a cutter member for cutting the lateral roots of the root stump, The block reinforcement, which bites into the ground and loosens it as the drum member rotates, is positioned in close proximity to the cutter member on the inner and / or outer surface of the drum member, with the block reinforcement extending in the vertical direction. The root stump removal device is characterized by comprising: an arm member attached to the drum member so as to be tiltable in the opposite rotational direction of the drum member while hanging down from the drum member; a cutter blade attached to the arm member so as to be located on the side of the drum member in the positive rotational direction; and a receiving member hanging down from the drum member so as to face the arm member on the side of the drum member in the opposite rotational direction and to receive the tilting of the arm member.

2. The root stump removal device according to claim 1, characterized in that a cushioning member that receives and rebounds from the load of the arm member is attached to the arm member side of the receiving member.

3. The root stump removal device according to claim 1 or 2, characterized in that the block reinforcement is provided on the drum member in a state that allows for free rotation.

4. The root stump removal device according to claim 1 or 2, characterized in that the block reinforcement is provided in a fixed state to the drum member.

5. The root stump removal device according to claim 1 or 2, characterized in that the cutter blade is mounted at an angle with respect to the length direction of the arm member.

6. The root stump removal device according to claim 1 or 2, characterized in that the cutter blade is attached to the arm member with its corner in the lowest position.

7. The root stump removal device according to claim 1 or 2, characterized in that the receiving member hangs down from the drum member in a vertical or diagonal position.

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