JP2872726B2 - Drilling claw welding positioning device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a positioning device used for welding a drilling claw or a block for mounting a drilling claw to a claw mounting plate in a drilling bit for drilling in the ground.

(Prior art) As an excavation bit for ground excavation to be attached to the tip of a rotary shaft, a plurality of spiral blades are welded around the rotary shaft, and a drilling claw is welded to the lower part of each spiral blade, or a nail is attached. There is a structure in which a block is welded and a nail is bolted to the block.

Conventionally, when such a drilling claw or a claw mounting block is welded, a screw shaft welded to a rotating shaft is fixed upside down on a table, and the drilling claw or the block is fixed to the spiral blade with an adhesive tape. Temporarily fixed,
In this state, welding was performed by a welding machine.

(Problems to be Solved by the Invention) However, according to the above-described conventional technology, it is difficult to set a constant distance, inclination angle, and the like from the rotation axis center of the excavation claw with respect to the spiral blade, resulting in poor positioning accuracy of the excavation claw. However, there is a problem that it is difficult to keep the product dimensions constant.

The present invention has been made in view of the above-described problems of the prior art, and improves the positioning accuracy when welding a drilling claw or a claw mounting block to a spiral blade or the like, thereby producing a drilling bit with stable dimensions and good drilling performance. An object of the present invention is to provide a welding claw welding positioning device that can be used.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an apparatus for welding a drilling claw or its mounting block to a claw mounting plate mounted on a rotary shaft for excavation, in an upward and rotational angle direction. A chuck device that is installed so as to be adjustable and vertically grips the rotating shaft with its tip side up, a column installed at a location horizontally separated from the chuck device, and a height adjustment along the column. A lateral guide freely and attached to the chuck device, a lateral rod movably attached along the lateral guide, and a universal joint attached to a distal end of the lateral rod via a universal joint; It is characterized by comprising a block or a holder for removably holding a combination of these blocks.

(Operation) Since the device of the present invention has the above-described structure, when welding is performed, a rotary shaft obtained by welding a claw mounting plate such as a spiral blade to a chuck device is vertically fixed with its tip side facing upward. The rotation angle of the chuck device is adjusted so that the excavation claw welding portion faces the support, while the excavation claw or a block for attaching the excavation claw or a combination thereof is fixed to the holder. The position of the excavation claw or the block with respect to the claw mounting plate is set by adjusting and fixing the height and sliding and fixing the horizontal rod along the horizontal guide. The direction of the excavation claw can be finely adjusted and adjusted by a universal joint. Once the above position adjustment has been performed, when welding to another spiral blade or the like, only fine adjustment of the chuck device, retraction of the horizontal rod and re-approach is required, and no fine adjustment is required.

(Embodiment) FIG. 1 is a partial cross-sectional side view showing an embodiment of a positioning device according to the present invention, and 1 is a steel plate serving as a base and fixed horizontally to the ground. Reference numeral 2 denotes a hexagonal cylindrical connecting portion 3 of a drill bit main body, a cylindrical rotary shaft 4 concentric with the connecting portion 3, and a spiral blade welded therearound, that is, a nail mounting plate 5; 5 is provided with one or more notch 6 for excavating claw welding.

Reference numeral 7 denotes a chuck device for setting the drill bit main body 2 upside down. The chuck device 7 includes a thrust bearing 10 a in a cylinder 9 fixed on a base 1 by bolts 8.
And a shaft chuck 11 rotatably mounted via a radial bearing 10b, a disk 12 fixed to the shaft 11 concentrically, and a scroll chuck device fixed concentrically with a bolt 13 on the disk 12; As shown in the plan view of FIG. 2, grooves provided radially
It has three or more chuck pawls 16 that move along 15, and by turning an opening / closing bolt 18 provided on the side, the pawls 16 move simultaneously via an internal mechanism (it is publicly known and omitted). It holds the connecting portion 3 of the drill bit main body 2.

The fixing flange 19 of the cylinder 9 has a marker concentric with the shaft 11.
20 is fixed so that the upper end thereof is close to the periphery of the disk 12, and a mark 21 provided on the outer surface of the marker 20;
The rotation of the drill bit main body 2 held by the chuck device 7 is configured to be aligned by alignment with the mark 22 provided around the periphery of 12.

24 is screwed into the screw hole of the cylinder 9 and the chuck device 7
A fixing bolt for fixing the chuck device 7 by pressing against the shaft 11 after the position is determined.

Reference numeral 26 denotes a contact for flowing a current flowing during electric welding to the ground without passing through the bearings 10a and 10b.

At a position horizontally separated from the chuck device 7 by a predetermined distance, a rectangular column 30 is vertically set by a bolt 28. A rectangular cylindrical slide tube 32 is fitted to the column 30, and the handle 38 is rotated by a bracket 37 attached to the top of the column 30 into a screw hole 35 of a block 34 fixed to the side surface of the slide tube 32. Screw the screw rod 39 attached so that it is
32 is configured to move up and down. As shown in the plan cross-sectional view of FIG.
A fixing bolt 40 is attached to the column 30 to be pressed against the column 30 by tightening.

As shown in FIG. 3, a rectangular cylindrical lateral guide 42 is horizontally mounted on the slide cylinder 32 by welding or the like so as to face the chuck device 7. A tubular horizontal rod 44 is fitted. After positioning the horizontal rod 44, the horizontal guide 42
A fixing bolt 45 for tightening and fixing to 42 is provided. Reference numeral 47 denotes a stopper which is movably fitted to a rear portion of the horizontal rod 44, and is provided so as to be fixable by a fixing bolt 48. The projection width to the device 7 side is set. The position of the stopper 47 is
It is fixed according to the scale 50 attached to.

As shown in FIG. 1, the holder 55 of the excavation claw 53 is attached to the front end of the horizontal rod 44 via a universal joint 52 formed of a spherical connection body. A vertical plate 56 is provided at the front end of the horizontal rod 44, and a plurality of bolts 57 screwed into the vertical plate 56 are brought into contact with the back surface of the holder 55, whereby
The holder 55 is configured to prevent movement after the angle is set.

1 and 4 (perspective view) on the front surface of the holder 55.
As shown in FIG.
And the pin-shaped projection 60 are fixed. Also, a plurality of adjusting bolts 62 are screwed into the holder 55, and these are brought into contact with the abdominal surface of the excavating claw 53, and the screwing depth of the adjusting bolt 62 is changed, so that the posture of the excavating claw 53 can be finely adjusted. It has become so. Further, a horizontal plate 64 is formed by bending the upper portion of the holder 55, and a nut 65 is welded to a hole provided in the horizontal plate 64,
The excavating claw 53 is fixed by screwing the fixing bolt 66 into the nut 65 and pressing it against the upper surface of the excavating claw 53 in the drawing.

In this embodiment, as shown in FIG. 5, an excavating claw mounting block 68 is welded to the notch 6 of the claw mounting plate 5 (b), and a groove 69 provided on the excavating claw 53 is fitted into the block 68. And bolt 70
This shows that the excavation claw 53 is fixed to the block 68, and therefore, the holder 55 holds the block 68 attached to the excavation claw 53 with the bolt 70 in advance.

When welding is performed using this apparatus, as shown in FIG. 1, the drill bit main body 2 is set upside down as shown in FIG. By aligning the notch 6 to be welded with the mark 22 on the disk 12 so that the notch 6 to be welded faces the column 30, the shaft 11 is fixed by the fixing bolt 24 so that the chuck device 7 does not rotate. To (Even when the notch 6 is formed by fusing, the notch 6 can be formed by holding the drill bit main body 2 on the chuck device 7 and fixing the shaft 11 with the fixing bolt 24.) The connecting portion 3 of the drill bit main body 2 has a hexagonal shape, the number of the chuck claws 16 is three, and the positions of the two or four claw mounting plates 5 with respect to the connecting portion 3 are also predetermined. As shown in FIG. 2, if the drill bit main body 2 is set in the chuck device 7, the position of the notch 6 on the chuck device 7 is automatically determined. 6 can be directed to the column 30 side.

On the other hand, the excavation claw 53 in which the block 68 is fixed by the bolt 70 is held by the holder 55 as described above, and the horizontal rod 44 is moved until the preset stopper 47 contacts the horizontal guide 42, and the handle 38 Turn to adjust the height, tighten the fixing bolt 40 to fix the slide cylinder 32 to the column 30, and tighten the fixing bolt 45 to set the side guide.
The horizontal rod 44 is fixed to 42, and the screwing depth of the adjustment bolt 62 is further adjusted to finely adjust the posture of the excavation claw 53.
As shown by a two-dot chain line c in the drawing, the block 68 is welded by approaching or contacting the notch 6.

Next, a block 68 is welded to another notch 6, but in this case, the fixing bolt 45 is loosened and the horizontal rod 44 is retracted.
Hold the excavation claw 53 with the new block 68 in the holder 55,
Further, the bolt 24 is loosened and the chuck device 7 is rotated, and the next notch 6 is moved to the welding position by aligning the mark 21 of the marker 20 with the other mark 22 of the disk 12, and the horizontal rod
44 is moved to the drill bit main body 2 side until the stopper 47 comes into contact with the lateral guide 42, fixed by the fixing bolt 45, and welded.

FIG. 6 is a plan view showing another embodiment of the present invention, in which a plurality of columns 30A to 30F are erected around the chuck device 7, and slide cylinders 32A to 32F are respectively movable up and down on the columns 30A to 30F. And slide guides 42A to 42F on each slide cylinder 32A to 32F
And lateral rods 44A to 44F are movably fitted to the respective lateral guides 42A to 42F, and stoppers 47A to 4A are respectively attached to the respective lateral rods 44A to 44F.
7F is movably fitted, and fixing bolts 4
0, 45, and 48 are provided, and holders 55A to 55F are attached to the front ends of the horizontal rods 44A to 44F via universal joints 52A to 52F. By setting the heights of the horizontal rods 44A to 44F and the positions of the stoppers 47A to 47F, various drill bit main bodies 2 can be prepared.
Can be used for welding the holder 68 to

In the above-described embodiment, the case where the claw mounting plate 5 is a spiral blade has been described. However, the present invention relates to a case where the claw mounting plate 5 is a flat plate radially mounted on the rotating shaft 4, or welded to the rotating shaft 4. The present invention can also be applied to a case where a single plate is used, and a case where a notch 6 is provided in a step shape on one nail mounting plate and a block 68 is welded to each step.

When the block 68 is welded, the block 68 may be held by the holder 55.
The present invention can also be applied to a case where is welded directly to the notch 6 or another welding portion.

(Effect of the Invention) According to the first aspect, the holding of the drill bit main body by the chuck device, the positioning of the rotation position, and the like can be reliably performed, and the height and the projection width of the horizontal rod can be accurately set. The positioning accuracy at the time of welding the claw mounting block or the excavation claw with respect to is improved, the product dimensions are stabilized, and the quality is stabilized. In addition, since the positioning can be performed quickly, mass production of the drill bit is achieved, and the price of the drill bit is reduced.

According to the second aspect, the protrusion width of the horizontal rod can be automatically set by the stopper, so that the positioning operation is facilitated.

[Brief description of the drawings]

FIG. 1 is a partially sectional side view showing an embodiment of a positioning device according to the present invention, FIG. 2 is a plan view of a chuck device of the present embodiment, and FIG. FIG. 4 is a perspective view of the holder of the embodiment,
FIG. 5 is a partially sectional side view showing an example of a welding structure according to this embodiment, and FIG. 6 is a plan view showing another embodiment of the present invention. 1: Stand, 2: Drilling bit body, 3: Connection, 4: Rotary axis, 5: Claw mounting plate, 6: Notch for welding, 7: Chuck device, 9: Cylindrical, 10
a, 10b: Bearing, 11: Shaft, 12: Disk, 16: Chuck, 20: Marker, 21, 22: Mark, 24: Bolt, 30: Support, 32: Slide cylinder, 34: Block, 35: Screw Hole, 39: Screw rod, 38: Handle, 40, 45, 48, 66: Fixing bolt, 42: Side guide,
44: Horizontal rod, 52: Universal joint, 53: Drilling claw, 55: Holder, 59, 60: Projection, 62: Fine adjustment bolt, 68: Claw mounting block

Claims (2)

(57) [Claims] An apparatus for welding a drilling claw or its mounting block to a claw mounting plate mounted on a rotary shaft for excavation, wherein the device is installed upwardly and with its rotation angle adjustable, with the tip of the rotary shaft facing upward. A chuck device for vertically gripping, a column installed at a location horizontally separated from the chuck device, a horizontal guide attached to the chuck device so as to be adjustable in height along the column, and A horizontal rod mounted so that the position can be adjusted along the horizontal guide, and attached to the tip of the horizontal rod via a universal joint,
A welding positioning device for a drilling claw, comprising a holder for detachably holding the drilling claw, its mounting block, or a combination thereof. 2. The apparatus according to claim 1, further comprising a stopper attached to said horizontal rod and abutting on said horizontal guide to adjust a projection width of said horizontal rod.