JP3123193B2 - Round picks and drilling tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a round pick used for excavation and a drilling tool to which the round pick is attached.

[0002]

2. Description of the Related Art A round pick is mounted on various kinds of excavating tools to perform excavation or rock drilling of the ground, and conventionally, a round pick having a shape as shown in FIG. 9 has been known. In FIG. 9, reference numeral 1 denotes a cylindrical shank, and a part of the shank on the base end side is reduced in diameter to form a concave portion 2 for attaching the round pick to a drilling tool.

On the other hand, the tip side of the shank 1 is once enlarged in the tip direction and then gradually reduced in diameter, and the tip surface of the shank 1 is formed of a cemented carbide tip 3 having a cylindrical shape and a conical tip.
However, it is coaxial with the shank 1 and is implanted in a state where the tip protrudes from the tip face of the shank 1.

The above-mentioned conventional round pick is attached to an excavating tool with its axis protruding at a predetermined angle with respect to the surface of the ground to be excavated. Then, by rotating the excavating tool toward the tip of the round pick while pressing the tip of the round pick against the ground, the tip 3 bites into the ground, and as a result, the ground is crushed and excavation is performed. When the tip 3 is worn by excavation, the tip 3 is sequentially replaced with a new one.

[0005]

However, in the case of the above-mentioned conventional round pick, the ground is constantly in contact with the ground during excavation.
As a result, since the part most involved in excavation is almost the same part of the round pick, there is a problem that only the part in contact with the ground is locally worn during excavation, and the life of the round pick is shortened.

In order to solve the above problem, a round pick as disclosed in Japanese Utility Model Laid-Open No. 60-8704 is disclosed. As shown in FIG. 10, a plurality of ridges 4 extending toward the tip of the tip 3 are formed on the outer periphery of the tip 3 implanted at the tip of the shank 1, and this ridge 4 is connected to the axis of the round pick. By tilting the round pick in two directions with respect to the round pick, a rotational force around the axis is applied to the round pick during excavation to prevent local wear in the round pick.

However, in the case of the round pick according to the above-mentioned invention, since the range of formation of the ridge 4 is very narrow only at the outer periphery of the tip 3 implanted at the tip of the shank 1, the rotation around the axis provided to the round pick during excavation Has a weak rotational force,
In addition to the low effect of preventing local wear of the round pick due to rotation, there is a problem that the shank 1 is more likely to be worn than the tip 3 because the shank 1 has no wear preventing means. In addition, there is also a problem that the excavation speed is low because only the tip 3 implanted at the tip of the round pick crushes the ground directly during digging.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a column-shaped shank and this shank.
A first tip protruding from the tip of the junk;
A plurality of second tips protruding from the outer peripheral surface of the link.
The second chip is connected to the first chip.
Installation of the first enlarged part of the shank and the shank on the drilling tool
And the second enlarged-diameter part provided on the tip side from the part.
Re round pick and is rotatably arranged the shank and along the periphery of said shank, said round pick mounted for rotation as a universal and about its axis detachable, drilling by revolving the round pick Drilling tools to do.

[0009]

In the round pick according to the present invention, a plurality of second tips protruding from the outer peripheral surface of the shank are provided so as to be able to rotate the shank along the circumference of the shank. When digging is performed by attaching to a digging tool, a part of the digging force received from the digging tool is always converted into a rotational force about the axis of the round pick at these second chips.

[0010] In particular, since the second tip is provided on the outer peripheral surface of the shank, the area of the second tip is large, and as a result, the rotating force applied to the round pick during excavation is reduced by the conventional round pick. It increases in comparison with.

[0011]

Embodiments of the present invention will be described below in more detail with reference to the drawings. 1 and 2 show examples of the shape of a round pick 10 according to the present invention. In FIGS. 1 and 2, reference numeral 11 denotes a cylindrical shank.
0 is formed in the excavation tool.

The distal end side of the shank 11 is once enlarged in the distal direction and then gradually reduced in diameter to form an umbrella-shaped enlarged portion 11a (second enlarged diameter).
Portion) is formed, further, from the distal end of the enlarged diameter portion 11a, the tip is gradually reduced in diameter (first expanded diameter portion) cylindrical head 11b
Project in the axial direction of the enlarged diameter portion 11a. The tip 11 of the head 11b has a shell-like first tip 13.
Is coaxial with the head 11b, and its tip is the head 11b.
It is implanted so as to protrude from the front end surface of the b.

On the other hand, on the outer peripheral surface of the enlarged diameter portion 11a, a plurality of second chips 14 each having a rod shape and projecting in the direction of the tip of the shank 11 are implanted with their longitudinal directions along the axis of the shank 11. Have been. In this case, as shown in FIG. 2, the second chip 14
They are arranged so that they are equidistant along the circumference of the enlarged diameter portion 11a.

Similarly to the enlarged diameter portion 11a, a plurality of second tips 14a which are rod-shaped and protrude outward in the radial direction of the shank 11 are also provided on the distal end side of the head 11b. It is planted along 11 axes. Also in this case, as shown in FIG. 2, the second chips 14a
Are arranged so as to be equidistant along the circumference of.

In the case of the round pick 10, the enlarged diameter portion 11a or the head 11 of the second chips 14, 14a is used.
(b) The cross-sectional shape of the protruding portion from the outer peripheral surface is a triangular shape whose ridge is directed in the protruding direction from the outer peripheral surface as shown in FIG. 1 or FIG.
The number of plantings of 4, 14a is eight each. Further, the first chip 13 and the second chip 1
All 4 and 14a are made of cemented carbide.

Next, an example of a drilling tool to which the round pick 10 is attached will be described below. FIG. 3 and FIG.
It is a figure which shows the example of the road surface excavation vehicle to which the round pick 10 was attached.

In FIGS. 3 and 4, reference numeral 15 denotes a drum mounted on a road surface excavating vehicle, the axis of which is parallel to the ground to be the road surface. 16 are provided. Further, the round pick 10 is mounted on each pick mounting block 16 with its axis inclined at a constant angle with respect to the circumference of the drum 15 and its tip protruding at a constant angle from the outer peripheral surface of the drum 15. , Which are detachably mounted and rotatable about the axis thereof.

The tip of the first tip 13 bites into the ground by rotating the drum 15 toward the tip of the round pick 10 about its axis while pressing the round pick 10 against the ground to be a road surface, As a result, the ground is crushed and excavation is performed.

Here, in the round pick 10, in addition to the first tip 13 being provided at the tip of the shank 11, a plurality of second tips 14, 14a projecting from the outer peripheral surface of the shank 11 are provided. As a result, the second chips 14 and 14a are pressed against the excavation surface together with the first chips 13 during excavation.

However, since the second chips 14 and 14a protrude along the longitudinal direction of the shank 11 and the axis of the round pick 10 is inclined at a constant angle with respect to the circumference of the drum 15, excavation is performed. Second chip 14, 14
a always receives a force in the circumferential direction of the round pick 10 from the ground, and as a result, the round pick 10 constantly rotates around its axis during excavation. In particular, since the second tips 14, 14a are formed over a wide area on the outer peripheral surface of the shank 11, a sufficient rotational force is always applied to the round pick 10 during excavation work, and the round pick 10 is locally excavated during excavation. Wear is prevented.

In addition, since both the enlarged diameter portion 11a and the tip end of the head portion 11b, which are particularly susceptible to wear during excavation in the shank 11, are protected by the second tips 14, 14a, wear of the shank 11 due to excavation is effective. Is prevented.

Further, the excavation by the first tip 13 and the auxiliary excavation by the second tips 14 and 14a are performed, so that the excavation speed is increased.

FIG. 5 is a view showing an example of an earth auger to which the round pick 10 is attached. In FIG.
Reference numeral 17 denotes a cylindrical screw shaft, and around the screw shaft 17, an auger screw 18 is provided.
7 is formed helically around the axis.

Reference numeral 21 denotes an auger head 21 which is composed of a hollow shaft 19 having a hollow cylindrical shape and an auger screw 20 formed around the hollow shaft 19. The base end of the auger head 21 is connected via a joint 22. Is connected to the tip of the screw shaft 17. Further, a plurality of pick mounting blocks 23 are disposed in parallel at the tip of the auger screw 20, and the round pick 10 is arranged on each pick mounting block 23 at a fixed angle with respect to the radial direction of the auger head 21. In a state in which it is inclined outward and its tip protrudes from the tip of the auger head 21 at a fixed angle,
It is attached detachably and rotatably about its axis.

Then, while the round pick 10 is pressed against the ground to be excavated, the screw shaft 17 is rotated toward the tip side of the round pick 10 about the axis thereof so that the tip of the first tip 13 bites into the rock. ,
As a result, the ground is crushed and excavation is performed.

FIGS. 6 and 7 are views showing an example of a shield excavator to which the round pick 10 is attached. In FIGS. 6 and 7, reference numeral 24 denotes a drive shaft that rotates about an axis, and a plurality of wings 2
5 is mounted perpendicularly to the drive shaft 24 and radially around the axis of the drive shaft 24.

Further, a plurality of pick mounting blocks 26 are disposed at the tip of the wing 25, and the round pick 10 is mounted on the pick mounting block 26 so that its axis is aligned with the circumference of a circle centered on the axis of the drive shaft 24. The wing 25 is attached detachably and rotatably about its axis in a state where the wing 25 is inclined outward at a certain angle and protrudes from the tip of the wing 25 at a certain angle. Further, a flat bit 27 is attached to the tip of the drive shaft 24 with its tip protruding from the tip of the wing 25.

On the other hand, the periphery of the drive shaft 24 is covered with a cylindrical shield tube 28 having a diameter slightly reduced from the diameter of the wing 25, and the distal end of the drive shaft 24 is located at the center of a lid 29 for closing the shield tube 28. It is supported by the formed bearing member 30. Reference numeral 31 denotes a discharge port for discharging earth and sand generated as a result of excavation.

Then, while the round pick 10 and the flat bit 27 are pressed against the ground to be excavated, the drive shaft 24 is pressed.
Is rotated toward the distal end of the round pick 10 about its axis, whereby the first tip 13 and the distal end of the flat bit 27 bite into the rock, and as a result, the rock is crushed and excavation is performed.

FIG. 8 is a view showing an example of a load header to which the round pick 10 is attached. In FIG.
Reference numeral 32 denotes a drive shaft that rotates about an axis.
A drum 33 having a conical shape is attached to the tip of the shaft so as to be coaxial with the drive shaft 32. Around the drum 33, wings 3 projecting from the outer peripheral surface of the drum 33 are provided.
Reference numeral 4 denotes a spiral formed around the axis of the drive shaft 32.

Further, a plurality of pick mounting blocks 35 are disposed on the wing 34, and the round pick 10 is mounted on the bit mounting block 26, and its axis is aligned with the wing 3.
4 in parallel with the projecting direction, and projecting from the tip of the wing 34 at a constant angle in the circumferential direction of the drum 33,
It is attached detachably and rotatably about its axis.

The tip of the drum 33 is pressed against the ground to be excavated, and the drive shaft 32 is rotated toward the tip of the round pick 10 about the axis thereof, whereby the round pick 10 implanted in the drum 33 is rotated. The tip cuts into the ground, resulting in crushing of the ground and excavation.

In the various excavating tools shown in FIGS. 5 to 8 as well, in the same way as in the case of the road excavating vehicle shown in FIGS. 3 and 4, the second chips 14, 14a during excavation are always round picks 10 from the ground. Subjected to circumferential forces, the round pick 10 constantly rotates about its axis during excavation. As a result, round pick 1 during excavation
Zero local wear is prevented.

In addition, the presence of the second chips 14, 14a protects the shank 11, effectively preventing the abrasion of the shank 11, and the second chips 14, 14a.
Since the auxiliary excavation is performed, the excavation speed is also improved.

In the case of the round pick 10 used in the above embodiment, both the second chips 14 and 14a protrude along the longitudinal direction of the shank 11, but around the axis received by the round pick 10 during excavation. In order to increase the force, the second tip 14, 14a is
You may make it project spirally centering on one axis.

[0036]

According to the present invention, in addition to the first tip provided at the tip of the shank constituting the round pick, a second tip projecting from the outer peripheral surface of the shank is newly provided . The chip is connected to the first chip
To the first enlarged part of the shank and the shank drilling tool
And the second enlarged diameter part provided on the tip side from the mounting part
Since the round pick is mounted on the drilling tool, when drilling is performed, a part of the drilling force received from the drilling tool by the round pick in the second tip is always rotated around the axis of the round pick. The round pick is constantly rotated around its axis during excavation. Therefore, local wear of the round pick during excavation is prevented, and the life of the round pick is extended.

Also, since the outer peripheral surface of the shank is protected by the second tip, wear of the shank due to excavation is prevented, and the second tip is used together with the excavation by the first tip. Since the auxiliary excavation is also performed, the excavation speed is also increased.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of the shape of a round pick in the present invention.

FIG. 2 is a front view showing a shape example of a round pick in the present invention.

FIG. 3 is a front view of a drum of the road digging vehicle according to the present invention.

FIG. 4 shows a drum IV-I of a road surface excavating vehicle according to the present invention.
FIG. 5 is a partial cross-sectional view along the line V.

FIG. 5 is a side view of the earth auger according to the present invention.

FIG. 6 is a partial sectional view showing an example of the structure of the shield excavator according to the present invention.

FIG. 7 is a front view of the shield excavator according to the present invention.

FIG. 8 is a side view showing an example of the shape of the load header according to the present invention.

FIG. 9 is a side view showing an example of the shape of a conventional round pick.

FIG. 10 is a side view showing an example of the shape of a conventional round pick.

[Explanation of symbols]

 1,11 shank 2,12 recess 3 tip 4 ridge 10 round pick 11a enlarged diameter portion 11b head 13 first tip 14,14a second tip 15,33 drum 16,23,26 pick mounting block 17 screw shaft 18, 20 Auger screw 19 Hollow shaft 21 Auger head 22 Joint 24, 32 Drive shaft 25, 34 Wing 27 Flat bit 28 Shield cylinder 29 Cover 30 Bearing member 31 Discharge port

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) E21C 35/18 E01C 23/12 E21B 10/44 E21D 9/08

Claims (7)

(57) [Claims] 1. A shank having a cylindrical shape, a first tip projecting from a tip end face of the shank, and a plurality of second tips projecting from an outer peripheral face of the shank,
This second chip is connected to the first chip
From the first enlarged part of the shank and the attachment part of the shank to the drilling tool
Respectively disposed on the second enlarged diameter portion provided on the distal end side, and
A round pick, wherein the shank is rotatably arranged along the circumference of the shank. 2. The method according to claim 1, wherein said second tip is an outer peripheral surface of a shank.
It has a triangular cross section that faces in the direction of projection
The round pick according to claim 1, wherein 3. A round pick according to claim 1 or 2, wherein the round pick is detachably mounted and rotatably mounted around its axis, and is used for excavation by revolving the round pick. A drilling tool characterized in that it is used. 4. A road surface excavator wherein the excavation tool attaches a round pick to an outer peripheral surface of a cylindrical drum, and excavates by rotating the drum about its axis while pressing the round pick against an excavation surface. The excavating tool according to claim 3, wherein the excavating tool is a vehicle. 5. The excavating tool spirally forms an auger screw around a hollow shaft having a cylindrical shape,
4. The excavator according to claim 3, wherein a round pick is attached to a tip of the auger screw, and the round pick is pressed against the ground while the hollow shaft is rotated around its axis to perform excavation. tool. 6. The excavation tool forms a plurality of wings at the tip of a drive shaft inserted into a cylindrical shield cylinder, attaches a round pick to the tip of the wing, and attaches the round pick to the ground. The excavation tool according to claim 3, wherein the excavation tool is a shield excavator that excavates by rotating the drive shaft about its axis while pressing against the surface of the excavator. 7. The digging tool spirally forms a wing projecting from the outer peripheral surface of the drum around a conical drum formed at the tip of the drive shaft so as to be coaxial with the drive shaft. 4. A road header which excavates by attaching a round pick to the tip of the wing and rotating the drive shaft about its axis while pressing the round pick against the ground.
Drilling tool as described.