JP3068462U - Earth Ogre - Google Patents

Abstract

(57) [Problem] To provide a drilling head that can be used for a long period of time to prevent a decrease in drilling performance due to uneven wear of a drilling blade and that can reduce construction cost. SOLUTION: A rotatable cone-shaped cone blade 2 is used as a drilling blade.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an earth auger having a spiral auger screw on the outer periphery of a long rotating shaft that is driven and rotated, such that the ground is excavated at the tip of the auger screw, and the excavated earth and sand is sent to the ground by the auger screw. It is used to drill holes in the ground.

[0002]

[Prior art]

 The drilling blade in the conventional earth auger has a straight blade surface, and the drilling blade is fixed to the tip of the auger screw portion by welding or the like. The tip of the auger screw is rotated while pressing against the ground, excavating with a drilling blade, and drilling while sending earth and sand to the ground with the auger screw. The unevenness of the drilling resistance due to the inclination of the verticality to the ground to be drilled, and the unevenness of the soil and rocks causes uneven wear of the drilling blade. When uneven wear occurs, the cutting edge of the drilling blade becomes worse, the drilling performance decreases, and the life is shortened. Also, since the drilling blades are fixed by welding etc., even if some of the drilling blades are partially worn, the tip of the auger screw was replaced, so the construction cost was low. It was expensive.

[0003]

[Problems to be solved by the invention]

 The problem to be solved by the present invention is to solve these problems in the past, to provide a ground auger that can be used for a long time and prevent the deterioration of the excavating performance due to uneven wear of the excavating blade, thereby reducing the construction cost. It is in.

[0004]

[Means for Solving the Problems]

 The configuration of the present invention that has solved the above problems is as follows: 1) In an earth auger provided with a spiral auger screw on the outer periphery of a long rotating shaft driven and rotated, a cone-shaped rotatable outer periphery of the auger screw is provided. Earth auger characterized by providing a plurality of drilling blades 2) In an earth auger provided with a spiral auger screw on the outer periphery of a long rotating shaft that is driven and rotated, the earth auger is rotatable at the tip of the auger screw. Earth auger characterized by providing a plurality of cone-shaped drilling blades 3) In an earth auger provided with a spiral auger screw on the outer periphery of a long rotating shaft driven and rotated, an outer peripheral portion of the auger screw Earth auger characterized by providing a plurality of rotatable cone-shaped drilling blades at the tip and the tip 4) Cone-shaped drilling blades The earth auger according to any one of 1) to 3) above, which is inclined with respect to the axial direction. 5) The above-mentioned 4) which is inclined toward the circumference in the rotation direction in which the cone-shaped drilling blade is excavated. 6) The earth auger according to any of the above 1) to 5), wherein the tip of the auger screw is detachable. 7) The 1 wherein the cone-shaped drilling blade is detachable. 8) The earth auger according to any one of 1) to 7), wherein the outer diameter of a part of the auger screw at the tip end side is reduced toward the tip.

[0005]

[Action]

 In the present invention, a plurality of rotatable cone-shaped drilling blades are provided on the outer peripheral portion of the auger screw. In this way, excavation is performed not only at the tip portion of the auger screw but also at the outer peripheral portion of the auger screw, so that the excavation resistance applied to each of the excavation blades can be suppressed and the excavation performance can be improved. In addition, the cone-shaped drilling blade provided on the outer peripheral part of the auger screw has less contact with the ground to be excavated, so that uneven wear hardly occurs. In addition, since the cone-shaped drilling blade is rotatable, the contact portion with the ground changes, so that even if uneven wear occurs in a part, the excavation performance is not easily reduced. If the auger screw has multiple cone-shaped drilling blades at the tip of the auger screw, the auger screw is rotated and the ground is excavated with the cone-shaped drilling blade provided at the tip of the auger screw. To do. For the auger screw with a plurality of rotatable cone-shaped drilling blades at the outer peripheral portion and the tip portion, excavation is efficiently performed by the cone-shaped drilling blades at both the outer peripheral portion and the tip portion of the auger screw. When the cone-shaped drilling blade is inclined with respect to the axial direction, the cone-shaped drilling blade can be excavated at an optimum excavation angle. When the cone-shaped drilling blade is inclined toward the circumference in the direction of rotation to excavate, the resistance at the time of excavation is small at an angle where the tip of the cone-shaped drilling blade touches the ground. And further improve the excavation performance. If the auger screw tip is detachable, the auger screw tip, which wears quickly, can be replaced. If the cone-shaped drilling blade is detachable, the worn-out drilling blade can be replaced. A structure in which the outer diameter of a part of the auger screw on the tip side becomes smaller toward the tip makes the resistance of the tip part of the auger screw in the excavation direction smaller, thereby facilitating excavation.

[0006]

[Embodiment of the invention]

 The size, angle and shape of the cone blade are determined according to the soil and rock quality to be drilled. The direction in which the cone blade protrudes is determined in consideration of the included angle of the cone blade and the clearance angle. The cone blade is preferably detachable from the drilling head. Alternatively, the blade portion of the cone blade may be detachable. The drive system for the rotating shaft on which the excavation head is mounted can be electric, hydraulic or other. The rotatable cone blade may be either a rotatable cone blade or a rotatable cone blade.

[0007]

【Example】

 Each embodiment of the present invention will be specifically described with reference to the drawings. Example 1 (see FIGS. 1 to 5) In Example 1 shown in FIGS. 1 to 5, a plurality of rotating cone-shaped drilling blades are provided on the outer peripheral portion and the distal end portion of the auger screw. The tip of the auger screw has a detachable structure, and the drilling blade has a detachable structure. This is an example of an earth auger in which a part of the outer diameter on the tip side of the auger screw becomes smaller toward the tip. FIG. 1 is an explanatory view of a drilling head attached to the tip of an auger screw of the earth auger of the first embodiment. FIG. 2 is a bottom view of the drilling head attached to the tip of the auger screw of the earth auger of the first embodiment. FIG. 3 is a partially enlarged explanatory view of the drilling head attached to the tip of the auger screw of the earth auger of the first embodiment. FIG. 4 is a sectional view taken along line AA of FIG. FIG. 5 is an explanatory diagram of the earth auger according to the first embodiment. In the figure, 1 is an earth auger, 2 is a cone blade, 2a is a blade tip, 2b is a blade base, 3 is a C ring, 4 is a hexagon screw, 5 is a drilling head, 5a is a shaft, and 5b is a screw. , 5c is a mounting portion, 6 is a digging portion, 7 is a rotating shaft, 8 is an auger screw, and 9 is a rail portion.

The drill head 5 of the earth auger according to the first embodiment is provided with a shaft portion 5a as shown in FIG. The shaft portion 5a is formed in a tubular shape, and the base end portion is formed in a hexagonal shape. The hexagonal shape of the shaft portion 5a is provided with a mounting groove. Next, a spiral screw portion 5b is provided on the outer periphery of the shaft portion 5a. The screw portion 5b is provided so that the two screws are spirally formed at a predetermined interval. Further, the screw portion 5b is shaped so that the outer diameter of the screw becomes smaller toward the tip. The distal end portion of the screw portion 5b is made to protrude forward from the shaft portion 5a. Next, as shown in FIG. 1, a plurality of mounting portions 5c are provided at the tip of the screw portion 5b. The mounting portion 5c is provided with a mounting hole, and is inclined toward the circumference in the rotation direction in which the mounting hole excavates. Further, as shown in FIG. 1, a plurality of mounting portions 5c are provided on the outer peripheral portion of the screw portion 5b so as to be inclined toward the circumference in the rotation direction for excavation. A screw hole is provided in the mounting hole of the mounting portion 5c so that the mounting hole communicates with the outside in a direction perpendicular to the axis of the mounting hole. An embedded hexagonal screw 4 is screwed into this screw hole and temporarily fixed. Next, the cone blade 2 is provided. The cone blade 2 has a cone-shaped blade tip rotatably provided at the tip of the main body. At the base end side of the cone blade 2, a blade base end 2b having a predetermined diameter and length is provided. Next, the blade base end 2b of the cone blade 2 is fitted into the C ring 3, and the blade base end 2b of the cone blade 2 to which the C ring 3 is mounted is fitted into the mounting hole of the mounting portion 5c. Next, the embedded hexagonal screw 4 temporarily fixed to the mounting portion 5c is tightened, and the C-ring 3 is pressed with the tip of the hexagonal screw 4 to fix the cone blade 2 together with the C-ring 3 to the mounting portion 5c.

The earth auger 1 has a vertically long rail section 9 on the front side, and the excavation section 6 is attached to the rail section 9 so as to be vertically movable. A pulley is attached to the excavation section 6, and the length of the wire stretched through a pulley attached to the upper end portion of the rail section 9 is changed so as to change the length of the excavation section 6. It moves up and down. Further, a rotating shaft 7 extending downward is provided below the excavation portion 6. A spiral auger screw 8 is provided on the outer periphery of the rotating shaft 7. The excavating section 6 is provided with a driving device for rotating the rotating shaft 7. A mounting hole is provided at the tip of the rotating shaft 7 so that the drilling head 5 can be rotated coaxially. The base end of the shaft portion 5a of the drilling head 5 is inserted into the distal end mounting hole of the rotating shaft 7, and the drilling head 5 is mounted by a not-shown locking means. In this state, while lowering the excavation section 6 of the earth auger 1, the driving device of the excavation section 6 is driven to rotate the rotary shaft 7. As a result, the drilling head 5 attached to the tip of the rotating shaft 7 also rotates. Thus, the cone blade 2 attached to the tip and the outer periphery of the screw portion 5b of the drilling head 5 excavates the ground. Since the cone blade 2 has a cone shape, the portion in contact with the ground is a part of the circumference, so that the shape is less likely to cause uneven wear. In addition, since the blade tip 2a is rotatable, good excavation performance is easily maintained by changing the contact portion with the ground one after another. Further, the excavating head 5 of the first embodiment is provided with the cone blade 2 also on the outer periphery of the screw portion 5b, and excavates with many cone blades 2. Therefore, the excavation resistance applied to one cone blade 2 is small. I am trying to become. Therefore, the service life of the excavation head 5 can be lengthened. Excavation resistance is also reduced by reducing the outer diameter of the screw portion toward the tip.

The excavated earth and sand is sent upward by the spiral movement of the screw portion 5b, and further sent upward by the spiral movement of the auger screw 8 to be discharged to the ground. Thus, according to the excavating head 5 of the first embodiment, good excavating performance can be obtained, and the service life can be extended. If one or several of the provided cone blades are worn and the excavation performance is reduced, loosen the hexagonal screw shown in Fig. 3 and remove the cone blade 2 and C-ring 3. It can be replaced by removing it from the mounting portion 5c and attaching it to the mounting portion 5c together with the C-ring 3 on the blade base end 2b of another new cone blade 2. When used in this manner, it is not necessary to replace the excavating head itself due to the wear of the drilling blade as in the related art, so that the construction cost can be suppressed. In addition, the excavation head is heavy, while the cone blade has the weight that can be held by hand, which improves the workability of replacement.

FIGS. 6 and 7 show another example of the drilling head of the earth auger of the first embodiment. In the figure, 10 is a drilling head, 10a is a shaft portion, 10b is a screw portion, 10c is a mounting portion, 11 is a cone blade, 13 is a drilling head, 13a is a shaft portion, 13b is a screw portion, and 13c is a mounting portion. , 14 are cone blades. FIGS. 6 and 7 show another example of the first embodiment in which the screw shape of the screw portion 10b, the mounting position and the direction of the cone blade 11, and the shape of the cone blade are different. You may use what was changed according to the conditions used. Other configurations, operations, and usage are the same as those in the first embodiment.

Embodiment 2 (See FIG. 8) Embodiment 2 shown in FIG. 8 is a grounding system in which a plurality of cone blades are provided so as to protrude in a predetermined direction only at the tip of a screw portion of a drilling head. This is an example of an auger. FIG. 8 is an explanatory view of a drilling head attached to the tip of the auger screw of the earth auger of the second embodiment. In the figure, 16 is a drilling head, 16a is a shaft portion, 16b is a screw portion, 16c is a mounting portion, and 17 is a cone blade. In the second embodiment, the cone blade 17 is provided only in the tip portion of the screw portion 16b in the direction along the spiral of each screw. Thus, the cone blade may be provided only at the tip of the screw portion 16b. In other respects, the configuration, operation, and usage are the same as those in the first embodiment.

Embodiment 3 (See FIG. 9) Embodiment 3 shown in FIG. 9 is an example of a Mars auger in which a plurality of cone blades are provided only on the outer peripheral portion of the screw portion of the drilling head. FIG. 9 is an explanatory view of a drilling head attached to the tip of the auger screw of the earth auger of the third embodiment. In the figure, 19 is a drilling head, 19a is a shaft portion, 19b is a screw portion, 19c is a mounting portion, and 20 is a cone blade. In the third embodiment, as shown in FIG. 9, the cone blade 2 is provided only on the outer periphery of the screw portion 19b. As described above, the cone blade may be provided at any portion, or may be combined so as to be provided only at the screw portion of the conventional auger screw of the earth auger. Other configurations, operations, and usages are the same as those in the first embodiment. FIGS. 10 to 15 show another example of the center portion of the tip of the drilling head of the earth auger of the embodiment. In the figure, 21 is the center of the tip, 21a is the head mounting portion, 21b is the cone blade, 21c is the mounting portion, 22 is the center portion of the tip, 22a is the head mounting portion, 22b is the cone blade, 22c is the mounting portion, and 23 is the mounting portion. A central portion of the tip, 23a is a head mounting portion, and 23b is a digging blade. FIGS. 10 to 15 show another example of the center part of the drilling head of the earth auger 1 which can be exchanged. As shown in FIGS. What is necessary is just to make it exchangeable according to the objective. Alternatively, as shown in FIGS. 14 and 15, the center portion 23 at the distal end may be a conventional drilling blade 23b and used so as to be combined with a cone blade portion.

[0014]

[Effect of the invention]

 According to the present invention, by providing a plurality of rotatable cone-shaped drilling blades on the outer peripheral portion of the auger screw, a reduction in the drilling function due to uneven wear of the drilling blades can be prevented, and the drilling blade can be used for a long time. Can be used as an earth auger to reduce construction costs. A plurality of cone blades are provided so as to protrude in a predetermined direction from the tip portion of the screw portion, and a plurality of cone blades protrude in a predetermined direction from the outer peripheral portion of the screw portion. The one that is provided can reduce the excavation resistance applied to one cone blade by using a plurality of cone blades, and effectively improve the excavation function by providing the cone blade at the screw part that contacts the ground. You. An auger screw provided with a plurality of rotatable cone-shaped drilling blades at the tip of the auger screw can be used as an earth auger for better drilling. An auger screw provided with a plurality of rotatable cone-shaped drilling blades on the outer peripheral portion and the distal end portion can further improve excavation properties. Cone-shaped drilling blades that are inclined with respect to the axial direction, and cone-shaped drilling blades that are tilted along the circumference in the rotating direction of excavation are used for cone-shaped drilling blades. The blades can be made to hit the ground at an appropriate angle to have better digging performance. When the tip of the auger screw is detachable, only the tip of the auger screw can be replaced, and the construction cost can be reduced. In the case where the cone-shaped drilling blade is configured to be detachable, it is possible to maintain good drilling performance by replacing only the drilling blade and reduce the construction cost. A structure in which the outer diameter of a part of the auger screw on the tip side becomes smaller toward the tip can further improve the excavation property.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a drilling head attached to the tip of an auger screw of an earth auger according to a first embodiment.

FIG. 2 is a bottom view of the drilling head attached to the tip of the auger screw of the earth auger of the first embodiment.

FIG. 3 is a partially enlarged explanatory view of a drilling head attached to the tip of an auger screw of the earth auger of the first embodiment.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is an explanatory diagram of an earth auger according to the first embodiment.

FIG. 6 is an explanatory view of another example of the drilling head attached to the tip of the auger screw of the earth auger of the first embodiment.

FIG. 7 is an explanatory view of another example of the drilling head attached to the tip of the auger screw of the earth auger of the first embodiment.

FIG. 8 is an explanatory view of a drilling head attached to the tip of an auger screw of an earth auger according to the second embodiment.

FIG. 9 is an explanatory view of a drilling head attached to the tip of an auger screw of an earth auger according to a third embodiment.

FIG. 10 is an explanatory view of another example of the center portion at the tip end of the drilling head of the earth auger of the embodiment.

FIG. 11 is an explanatory view of another example of the center portion of the tip of the drilling head of the earth auger of the embodiment.

FIG. 12 is an explanatory view of another example of the center portion of the tip of the drilling head of the earth auger of the embodiment.

FIG. 13 is an explanatory view of another example of the center portion at the tip end of the drilling head of the earth auger of the embodiment.

FIG. 14 is an explanatory view of another example of the center portion at the tip end of the drilling head of the earth auger of the embodiment.

FIG. 15 is an explanatory view of another example of the central portion at the tip end of the drilling head of the earth auger of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Earth auger 2 Cone blade 2a Blade tip 2b Blade base 3 C ring 4 Hexagon screw 5 Drilling head 5a Shaft 5b Screw 5c Mounting 6 Drilling part 7 Rotating shaft 8 Auger screw 9 Rail 10 Drilling head 10a shaft portion 10b screw portion 10c mounting portion 11 cone blade 12 missing number 13 drilling head 13a shaft portion 13b screw portion 13c mounting portion 14 cone blade 15 missing number 16 drilling head 16a shaft portion 16b screw portion 16c mounting portion 17 cone blade 18 missing number Reference Signs List 19 drilling head 19a shaft portion 19b screw portion 19c mounting portion 20 cone blade 21 central portion of tip 21a head mounting portion 21b cone blade 21c mounting portion 22 central portion 22a head mounting portion 22b cone blade 22c mounting portion 23 central portion 23a head Mounting part 23 b drill hole

Claims (8)

[Utility model registration claims] 1. An earth auger provided with a spiral auger screw on the outer periphery of a long rotating shaft driven and rotated, wherein a plurality of rotatable cone-shaped drilling blades are provided on the outer periphery of the auger screw. A characteristic earth auger. 2. An earth auger having a helical auger screw on the outer periphery of a long rotating shaft which is driven and rotated, wherein a plurality of rotatable cone-shaped drilling blades are provided at a tip portion of the auger screw. An earth auger characterized by the following. 3. An earth auger provided with a helical auger screw on the outer periphery of a long rotating shaft which is driven and rotated, wherein a plurality of rotatable cone-shaped drilling blades are provided on an outer peripheral portion and a tip portion of the auger screw. Earth auger characterized by that. 4. The earth auger according to claim 1, wherein the cone-shaped drilling blade is inclined with respect to the axial direction. 5. The earth auger according to claim 4, wherein the cone-shaped drilling blade is inclined toward a circumference in a rotation direction for excavation. 6. The earth auger according to claim 1, wherein a tip portion of the auger screw is detachable. 7. The earth auger according to claim 1, wherein the cone-shaped drilling blade has a detachable structure. 8. A structure in which a part of the outer diameter of the auger screw on the tip end side becomes smaller toward the tip end.
7. The earth auger according to any one of 7.