Rootstock removal device

Abstract

Prevent the device from being damaged by the impact of solids in the ground. 【Solution means】 It includes a drum member 61 that moves up and down while rotating in both forward and reverse directions and bites into the ground around the rootstock, and a cutter member 70 that is attached to the lower end of the drum member 61 with a gap therebetween and cuts the lateral roots of the rootstock. Block streaks 63 that bite into the ground and loosen the ground by the rotation of the drum member 61 are provided at positions close to the cutter member on the inner surface and / or outer surface of the drum member 61 in a state where they extend in the vertical direction. The cutter member 70 includes an arm member 71 that is attached to be tiltable in the reverse rotation direction of the drum member in a state of hanging down from the drum member, a cutter blade 72 that is attached to the arm member 71 so as to be located on the positive rotation direction 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 reverse rotation direction 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 felled, 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 a state of being attached 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 non-rotatably attached to an arm 110 of the self-propelled heavy machine 100. 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 rootstock removing device 1 up and down via a 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 rootstock removing device 1, and in this case, the lifting drive means 6 can be omitted.

[0005] As shown in FIG. 9, the lifting drive means 6 is formed by a lifting cylinder 20 composed of a hydraulic cylinder and a lifting frame 19 connected to the lifting cylinder 20. The lifting cylinder 20 is arranged inside the frame member 2 facing the vertical direction, and its upper end is fixed to the top of the frame member 2 by bolting or the like, and hangs down inside the frame member 2 in this fixed state. The lifting frame 19 has a cylindrical shape with a square cross-section similar to that of the frame member 2 and is inserted inside the frame member 2. Thus, the rotation of the lifting frame 19 is restricted by the frame member 2. The lifting frame 19 has a connecting plate 22 at the middle part in the length direction, and this connecting plate 22 is connected to the piston 21 of the lifting cylinder 20. Thereby, when the lifting cylinder 20 expands and contracts, the lifting frame 19 moves in the vertical direction along with the expansion and contraction of the lifting cylinder 20, and the drum member 3 descends and ascends.

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

[0007] The drum member 3 penetrates into the ground 8 around the rootstock 9 while performing ground excavation. The drum member 3 includes a drum main body 11 formed in a cylindrical shape from a metal material having high strength and rust prevention properties such as stainless steel. By forming the drum main body 11 in a cylindrical shape, the earth and sand during ground excavation enter the drum main body 11 from the lower end opening. A plurality of window portions 12 are formed in the upper portion of the drum main body 11, and the earth and sand that have entered the drum main body 11 can be discharged to the outside. As a result, ground excavation can be continuously performed. A cutter member 4 is attached to the lower end portion of the drum member 3.

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

[0009] As shown in FIG. 10, each cutter member 4 includes a bracket member 41 attached to the lower end portion of the drum member 3 at an interval, 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 sandwiches the lower end portion of the drum member 3 from both sides, and is fixed to the lower end portion of the drum member 3 by screwing in a bolt 45 with respect to this sandwiched state. The arm member 42 is tiltably attached to the bracket member 41. The upper portion of the arm member 42 is rotatably attached to a support shaft 46 fixed to the tip side in the length direction of the bracket member 41, and thus is in a state of hanging down from the bracket member 41. By being attached in this way, the arm member 42 is tiltable with respect to the bracket member 41.

[0011] The cutter blade 43 is fixed to the lower part of the arm member 42 by bolts. The cutter blade 43 has a blade portion formed on the tip side, and the blade portion cuts the lateral roots 9a of the rootstock 9. The entire cutter blade 43 is received by the arm member 42 when the entire surface of the rear end portion thereof abuts against 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. Then, 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] When the drum member 3 rotates in the positive rotation direction X to perform ground excavation, the biasing member 44 presses the arm member 42 so that the cutter blade does not retract, and biases to return the inclination of the arm member 42 when the arm member 42 tilts. The biasing member 44 is formed by a coil spring 50. A bolt shaft 51 passing through the coil spring 50 and a sandwiching member 49 facing the arm member 42 are arranged. The bolt shaft 51 supports the expansion and contraction operation of the coil spring 50 in a state of being spanned between the arm member 42 and the sandwiching member 49. The coil spring 50 shortens when the arm member 42 tilts in the direction Y opposite to the positive rotation direction X of the drum member 3, stores spring force by this shortening, and elastically biases the arm member 42 to return to its original position.

[0013] In such a rootstock removing device 100, the self-propelled heavy machine 100 is moved, and the rootstock removing device 1 is positioned on the target rootstock 9. Then, while rotating the drum member 3 in the positive rotation direction X by the rotation driving means 7, the drum member 3 is lowered by the lifting and lowering driving means 6. Thereby, the drum member 3 excavates the ground 8 around the rootstock 9. Also, the cutter member 4 cuts the lateral roots 9a of the rootstock 9 by the rotation of the drum member 3. Thereafter, the rootstock 9 is pulled up by the heavy machine 100 or manually.

Prior Art Documents

[0014]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0015] However, in the conventional structure, as the drum member 3 rotates, the soil of the ground becomes densely compacted and hard, resulting in a large resistance to the rotation of the drum member 3. As a result, the rotation of the drum member 3 cannot be made smooth, and it hinders the cutting of lateral roots by the cutter member 4 and the penetration into the ground. In this case, a large load is applied to the rotational drive means 7 for rotating the drum member 3 and the heavy machine 100 serving as the power source, which may also cause damage to them. In addition, in the conventional structure, since a bracket member 41 is required to attach the arm member 42, the biasing member 44, and the clamping member 49, the total number of parts of the cutter member 4 is large, the structure is complex, and the assembly is troublesome.

[0016] The present invention has been made in consideration of such problems of the conventional structure, and an object thereof is to provide a rootstock removing device that can prevent the soil of the ground from becoming dense and simplify the structure of the cutter member.

Means for Solving the Problems

[0017] The rootstock removing device of the present invention includes a drum member that moves up and down while rotating in both forward and reverse directions and penetrates into the ground around the rootstock, and a cutter member that is attached to the lower end portion of the drum member with a space therebetween and cuts the lateral roots of the rootstock. Block streaks that penetrate into the ground by the rotation of the drum member and loosen the ground are provided at positions close to the cutter member on the inner surface and / or outer surface of the drum member in a state where they extend in the vertical direction. The cutter member includes an arm member that is attached to hang down from the drum member and is tiltable in the reverse rotation direction of the drum member, a cutter blade that is attached to the arm member so as to be located on the positive rotation direction 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 reverse rotation direction side of the drum member and receives the tilt 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 so as to be inclined with respect to the longitudinal direction of the arm member, which is characterized. Further, the cutter blade is attached to the arm member with the 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 positions 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 becoming densely hardened and hard, reduce the resistance of the ground to the drum member, and reduce a large load on the rotation driving means of the drum member and the heavy machine.

[0020] Further, since the block ribs are provided at positions close to the cutter member, the soil of the ground around the cutter member is loosened, so that it becomes easy to cut into the ground and cut lateral roots by the cutter member. 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

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

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 members identical to those of the conventional rootstock removing device are denoted by the same reference numerals for correspondence.

[0023] As shown in FIGS. 1 and 2, in the rootstock removing device 60, 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 the conventional one, and is attached to the self-propelled heavy machine 100 to remove rootstocks (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 the lower end released by a high-strength metal material such as stainless steel, and a plurality of window portions 62 for discharging earth and sand are opened. The lower end portion 61a of the drum member 61 is formed linearly. The drum member 61 rotates in the positive rotation direction X to bite into the ground 8 and perform ground excavation. A plurality of large-diameter punching holes 65 are formed in the drum member 61. By forming the punching holes 65, the drum member 61 can be made lightweight. If not necessary, the punching holes 65 may be omitted.

[0025] A plurality of block ribs 63 are provided on the drum member 61. The block ribs 63 are formed by vertically long block-shaped reinforcing bars or stainless steel bars such as cylinders or square columns. The block ribs 63 are provided at a position close to a cutter member 70 described later in a state of extending in the vertical direction. The block ribs 63 only need to extend in the vertical direction and may be inclined obliquely. In the illustrated form, the block ribs 63 are provided on the outer surface and the inner surface of the drum member 61. However, the block ribs 63 may be provided on only one of the outer surface or the inner surface of the drum member 61 as long as they are at a position close to the cutter member 70.

[0026] In this form, the upper and lower ends of the block ribs 63 are supported by bearings 66 provided on the drum member 61 and are in a freely rotatable state. By being in such a freely rotatable state, when contacting the soil of the ground, the block ribs 63 rotate due to the contact pressure, so that the soil of the ground can be stirred and the soil of the ground can be well loosened. In this case, not limited to the bearings 66, a structure in which the block ribs 63 are freely inserted into a simple support fitting may also be acceptable.

[0027] The plurality of block ribs 63 described above act so as to bite into the ground by the rotation of the drum member 61. When the block ribs 63 bite into the ground, the block ribs 63 act to loosen the soil of the ground. Therefore, it is possible to prevent the soil of the ground from becoming dense and hard due to the rotation of the drum member 61, and it is possible to reduce the resistance of the ground against the rotation of the drum member 61. As a result, the drum member 61 can easily bite into the ground. In addition, since the block ribs 63 are provided at positions close to the cutter member 70, the block ribs 63 loosen the ground near the cutter member 70, so that the cutter member 70 can easily bite into the ground and can easily cut lateral roots. These can reduce the load on the rotational drive means 7 and the heavy machine 100 that serves as power, and can prevent damage to these.

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

[0029] The arm member 71 is attached to the drum member 61 in a state of hanging down from the lower end portion 61a of the drum member 61. Each arm member 71 is attached to the drum member 61 by bolts 74 while sandwiching the lower end portion 61a of the drum member 61, and can tilt in the reverse rotation direction Y when a pressure exceeding the necessary amount acts from the ground 8. In the arm member 71 shown in FIG. 1, it hangs down from the drum member 61 in a shape extending straight downward from the drum member 61. Not limited to this, the hanging down of the arm member 71 from the drum member 61 may be inclined and hang down somewhat in the forward and reverse rotation directions X, Y.

[0030] The cutter blades 72 are fixed to the lower parts of the respective arm members 71 by bolts 75. The cutter blades 72 are formed with concave and pointed blade portions 72a on the positive rotation direction X side. As the drum member 61 rotates in the positive rotation direction X, the cutter blades 72 cut the lateral roots 9a of the rootstock 9 while excavating the ground. The outer shape of the cutter blades 72 may be square, circular, or other shapes.

[0031] As shown in FIGS. 1 and 3, the entire cutter blades 72 are attached to be inclined with respect to the longitudinal direction of the arm members 71. As a result, the blade tips 72a of the cutter blades 72 are inclined, and ground excavation is performed in this state. When the cutter blades 72 are inclined, the blade tips 72a become diagonal and bite in, making it easier to excavate the ground and cut the lateral roots 9a.

[0032] The receiving members 73 are fixed to the lower end portions 61a of the drum member 61 so as to be located on the reverse rotation direction Y side with respect to the respective arm members 71. That is, the receiving members 73 are fixed to the drum member 61 so as to face the arm members 71 on the back side of the respective arm members 71. Thereby, the receiving members 73 act to receive the tilting of the arm members 71 in the reverse rotation direction Y.

[0033] The receiving members 73 are formed of a high-strength material such as iron or stainless steel, and are fixed to the lower end portions 61a of the drum member 61 in a vertically hanging state. The fixing of the receiving members 73 to the drum member 61 is performed by welding or bolting with two or more bolts, and is firmly fixed to the drum member 61. These can prevent the receiving members 73 from bending or deforming, so that the tilting of the arm members 71 can be reliably received.

[0034] As shown in FIGS. 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 formed of a cushioning material such as rubber, elastic resin, or spring. A spring 78 is disposed inside the cushion member 76, but the spring 78 can also be omitted. Further, when the spring 78 is omitted, a simple attachment structure can be adopted in which the cushion member 76 is directly adhered or welded to the receiving member 73.

[0035] When the arm member 71 tilts in the reverse rotation direction Y with respect to the cushion member 76, the arm member 71 abuts against the cushion member 76. As a result, the cushion member 76 absorbs the pressing force in reaction to the pressing force caused by the tilting of the arm member 71, so that the pressing force of the arm member 71 acting on the receiving member 73 can be reduced. For this reason, the receiving member 73 can more reliably receive the arm member 71, and the cutter member 70 can surely bite into the ground 8 and cut the lateral roots. Here, the receiving member 73 only needs to be able to receive the tilting of the arm member 71, and the cushion member 76 can be omitted when the tilting of the arm member 71 can be reliably received.

[0036] In the embodiment of the present invention shown in FIGS. 1 to 4 above, the block ribs 63 provided at positions close to the cutter members on the inner surface and / or outer surface of the drum member 61 loosen the soil of the ground by the rotation of the drum member 61, so that the resistance of the ground to the drum member 61 can be reduced, and the cutter member 70 can easily bite into the ground and cut the lateral roots. And since the cutter member 70 can easily bite into the ground and cut the lateral roots in this way, a simple structure can be adopted in which the cutter member 70, the arm member 71, and the receiving member 73 are directly attached to the drum member 61. Since a bracket member like the conventional structure is not required, a structure with a small number of parts can be achieved.

[0037] FIG. 5 shows a modified example in this embodiment. FIG. (A) of this figure shows the attachment state of the arm member 71 to the drum member 61, and the arm member 71 is attached to the drum member 61 at an angle α inclined toward the reverse rotation direction Y side. The angle α is set to about 18 to 22°. By being attached in this inclined manner, the cutter blade 72 of the arm member 71 is also inclined in the same way, and lateral roots can be cut well. FIG. (B) of this figure shows the state where the receiving member 73 is attached to the drum member 61 while being inclined at a certain angle. By inclining in this way, the entire cushion member 76 of the receiving member 73 receives the tilting of the arm member 71, so that the load from the arm member 71 can be received well. FIG. (C) of this figure shows the cutter blade 73 attached to the arm member 71. The cutter blade 73 is formed in a rectangular shape and is attached to the arm member 71 such that the corner portion 73a is at the lowest position. When the corner portion 73a is at the lowest position, the blade portion becomes thinner, and the corner portion 73a bites into the rootstock and lateral roots extending laterally from the ground, so that these can be surely cut.

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

[0039] Also in this embodiment, block ribs 63 are provided at positions close to the cutter member 70 on the inner surface and / or outer surface of the drum member 61, and the rotation of the drum member 61 is adapted to loosen the soil of the ground. Thereby, the resistance of the ground against the drum member 61 can be reduced, and the penetration of the cutter member 70 into the ground and the cutting of lateral roots are facilitated.

[0040] In this embodiment, the block ribs 63 are fixed to the drum member 61 by welding or bolting. By being fixed to the drum member 61 in this way, the fixing of the block ribs 63 becomes firm, and since it comes into contact with the soil of the ground, the soil of the ground can be surely loosened.

[0041] The lower end portion 61a of the drum member 61 in this form is formed in a continuous wave shape. As a result, the cutter member 70 at the lower end portion 61a of the drum member 61 contacts the lateral roots and the ground at the timing when it is displaced, so that it does not contact the lateral roots and the ground at the same time, and a large torque for cutting the lateral roots and excavating the ground is not required.

[0042] The receiving member 73 in this form is fixed to the drum member 61 while being inclined somewhat in the reverse rotation direction Y side, and is configured to receive the arm member 71 in this inclined state. The receiving member 73 inclined in the reverse rotation direction Y in this way is such that when the arm member 71 is inclined in the reverse rotation direction Y due to the resistance from the ground (that is, the arm member 71 escapes in the reverse rotation direction Y) and comes into contact with the receiving member 73, the pressing force due to 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. For this reason, a small pressing force acts on the receiving member 73. As a result, the receiving member 73 can surely receive the tilting of the arm member 71 and prevent the arm member 71 from tilting and escaping more than necessary, and the cutter member 70 can surely bite into the ground, enabling the lateral roots to be cut.

[0043] In some of the arm members 71, as shown in FIG. 7, the lower side has a shape bent in the outer direction of the drum member 61. That is, some of the arm members 71 have a shape having a bent portion 81 bent outward, and excavate the ground in a state of protruding outside the drum member 61 more than the other arm members 71 hanging vertically. By providing the drum member 61 so that the arm members 71 having this bent portion 81 and the other arm members hanging vertically from the drum member 61 are mixed, since the excavation positions are different, it is possible to bite into the ground over a wide range, and there is an advantage that the biting region into the ground and the removal range of the lateral roots are widened.

Explanation of reference numerals

[0044] 6 Lifting drive means 7 Rotation drive means 8 Ground 9 Rootstock 9a Lateral root 60 Root removal device 61 Drum member 62 Window part 63 Block rib 66 Bearing 70 Cutter member 71 Arm member 72 Cutter blade 73 Receiving member 76 Cushion member 81 Bending part Positive rotation direction of X Negative rotation direction of Y

Claims

1. A drum member that moves up and down while rotating in both forward and reverse directions and penetrates into the ground around the rootstock, A cutter member that is attached to the lower end of the drum member with a gap therebetween and cuts the lateral roots of the rootstock, and A block rib that penetrates into the ground by the rotation of the drum member and loosens the ground is provided at a position close to the cutter member on the inner surface and / or outer surface of the drum member in a state where the block rib extends in the vertical direction, The cutter member includes an arm member that is attached to be tiltable in the reverse rotation direction of the drum member in a state of hanging down from the drum member, a cutter blade that is attached to the arm member so as to be positioned on the positive rotation direction 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 reverse rotation direction side of the drum member and receives the tilt of the arm member, The rootstock removing device, characterized in that the block rib is provided on the drum member in a freely rotatable state.

2. The rootstock removing device according to claim 1, 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.

3. The rootstock removing device according to claim 1 or 2, characterized in that the cutter blade is attached so as to be inclined with respect to the length direction of the arm member.

4. The rootstock removing device according to claim 1 or 2, characterized in that the cutter blade is attached to the arm member with the corner portion at the lowest position.

5. The rootstock removing device according to claim 1 or 2, characterized in that the receiving member hangs down from the drum member in a vertical state or an inclined state.

Images