JP3363426B2 - Chuck device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a chuck device for supporting a shaft body.

[0002]

2. Description of the Related Art Conventionally, there is a chuck device for supporting a shaft body. An example of application of the chuck device is a well drilling device. The well drilling equipment connects multiple drilling rods in series to the lower end of the drilling shaft, rotates it while pushing the drilling shaft downward, and drills the ground with the drilling head attached to the lowermost end of the drilling rod. It is a device.
In the well excavating device, a rotating excavating shaft is vertically moved by a hydraulic cylinder in a state where the excavating shaft is allowed to rotate, and the excavating shaft is supported by a chuck device to transmit the drive of the hydraulic cylinder.

[0003]

However, since the excavation shaft is firmly supported so as not to loosen due to the peculiarity of moving up and down while allowing rotation in this way,
Saw toothed knurls are formed on the surface of the chuck device that is in contact with the excavation shaft in the form of saw teeth on the shaft fixing piece.
As a result of the contact surface being strongly pressed against the excavation shaft, when the chuck device is released and the excavation shaft is removed, the uneven portion may slightly bite into the excavation shaft and become difficult to remove. Not only this well excavator but generally a knurl is often formed on the contact surface in contact with the shaft of the chuck device in order to improve the frictional force with the shaft, and there is a problem that the chuck device once mounted becomes difficult to come off. . Further, if the shaft is tightened with an extremely strong force without forming the knurls, the shaft tends to come off from the chuck device. The present invention has been made to solve such conventional problems. An object of the present invention is to provide a chuck device that can firmly remove a shaft when the chuck firmly tightens the shaft and becomes difficult to remove.

[0004]

Means for Solving the Problems In order to solve the above-mentioned problems, according to the invention of claim 1, a first cylindrical body having a first through hole and a male screw formed on the outer periphery thereof, and a second cylinder A second cylindrical body having a through hole formed therein and a female screw threaded to the male screw thread formed on the inner periphery thereof;
Of at least one of the first and second cylinders, which are surrounded by at least one of the first and second cylinders and relatively come close to each other when the male screw and the female screw are screwed together. And a shaft fixing piece that is pressed in the direction, and is clamped and fixed to the shaft body inserted in the first and second through holes via the coaxial fixing piece.
Alternatively, a communication passage is formed in at least one of the second cylindrical bodies along the axial direction of the shaft body so as to communicate from the inside of the first or second through hole to the outside, and the communication passage is opened. The gist of the invention is that a fastening release member having an abutting portion which is inserted into the communication passage and is capable of contacting the shaft fixing piece disposed in the communication passage is provided outside the tubular body. In such a configuration, the first and second cylinders are brought close to each other in a screwing relationship of their male screw and female screw, and the shaft fixing piece is pressed against the shaft body for tightening. On the other hand, when the tightened state is loosened, the first and second cylindrical bodies are separated from each other by the male screw and the female screw. At this time, if the shaft fixing piece bites into the shaft body, the shaft body cannot be pulled out from the first and second through holes. Therefore, the contact portion of the tightening release member is inserted into the communication passage from the outside of the communication passage, and is brought into contact with the shaft fixing piece to apply an impact to eliminate the bite.

According to a second aspect of the present invention, in addition to the structure of the first aspect, the first or second cylindrical body is mounted around the shaft body extending in the vertical direction, and the fastening release member is The gist of the present invention is that one of the first and second cylinders is placed on the upper side of one of the first and second cylinders so as not to contact the shaft body. According to a third aspect of the invention, in addition to the configuration of the second aspect, the tightening release member is placed on the upper side of either the first or the second tubular body disposed on the upper side. The gist of the invention is that the contact portion is inserted into the communication passage. In the invention of claim 4, in addition to the configuration of the invention described in claim 2 or 3, the gist is that the tightening release member includes an annular main body surrounding the shaft body.

[0006]

According to the invention described in claim 1, when the shaft fixing piece bites into the shaft body and the shaft body cannot be pulled out from the first and second through holes, from the outside of the communication passage. By inserting the contact part of the tightening release member into the same communication path and contacting the shaft fixing piece to apply impact, bite can be eliminated, and as a result, the chuck device and shaft body can be quickly removed. It will be possible. According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the tightening release member is placed on either the first or the second cylinder without contacting the shaft. Therefore, for example, the rotating shaft body does not come into contact with the member, which does not cause vibration or noise of the member or a defect of the member. According to the invention described in claim 3, in addition to the effect of the invention described in claim 2, since the contact portion of the fastening release member is inserted into the communication passage, the first fastening release member is mounted.
Alternatively, the stability on any one of the second cylinders is improved. According to the invention described in claim 4, in addition to the effect of the invention described in claim 2 or 3, since the tightening release member includes an annular body tightening surrounding the shaft body, the tightening release member is inadvertently caused by vibration or the like. Does not fall.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An example in which the chuck device according to the embodiment of the present invention is applied to a well excavating device will be described below with reference to the drawings. First, the well excavating device will be briefly described briefly. The well drilling device of the present embodiment is installed on a stand (not shown) set at a drilling site (not shown). A rectangular base plate 11 forming a part of the well excavating device is placed on the gantry. As shown in FIG. 1, a through hole 11 a is formed near the center of the base plate 11. A bed bearing 13 is disposed on the base plate 11 via a bracket 12. A bed 15 is rotatably supported on the bed bearing 13. The bed 15 is supported in a cantilever manner with respect to the coaxial receiver 13 and can rotate about the coaxial receiver 13. A geared motor 19 as a rotary drive source is mounted on the upper surface of the bed 15 via a bracket 18. A communication hole 15a is formed in the center of the bed 15. The communication hole 15a is arranged so as to be concentric with the through hole 11a of the base plate 11. The bearing 20 is mounted in the communication hole 15a. The bearing 20 includes a bearing metal 24 in which a through hole 24a having a square cross section is formed and a bearing cap 25 that supports the coaxial bearing metal 24. The drive of the geared motor 19 is transmitted to the bearing metal 24 via the gear mechanism 23 in the bed.

On the upper surface of the bed 15, guide rods 25 extend upward from three positions surrounding the communication hole 15a. The guide rods 25 are connected to each other by an alloy-made substantially equilateral triangular connecting plate 27 arranged at the upper end. An elevating plate 28 as a holding member is attached to the guide rod 27. Lifting plate 28
Can be moved up and down along the guide rod 27 via a slider 29. As shown in FIG. 2, the lifting plate 2
A through hole 28a is formed at the center of 8
a A thrust bearing 31 supported by a holder 32
Is provided. The holder 32 is fixed to the elevating plate 28 with bolts 34. A large through hole 32a is opened in the center of the holder 32. A chuck device 33, which will be described later, is attached to the thrust bearing 31.
The chuck device 33 is rotatably supported by the thrust bearing 31. The lift plate 28 has a base plate 1
A rod 36 extending upward from the first cylinder 35 is connected. The rod 36 is separable by a connecting portion 37 connected in a male / female relationship. In such a well drilling device, a drilling shaft 38 having a substantially square cross section is used.
Is the bearing metal 2 while being supported by the chuck device 33.
4 and the lower end is projected downward from the through hole 11a of the base plate 11. A plurality of drill rods 39 are connected in series downward from the drill shaft 38. An unillustrated excavation head is attached to the lower end of the excavation rod 39 at the lowermost end.

In the well excavating device thus constructed, the bearing metal 24 is rotated via the gear mechanism 23 under the drive of the geared motor 19. Then, the excavation shaft 38 also rotates. The rod 36 protruding from the cylinder 35 in order to advance the excavation rod 39 downward is gradually lowered from the uppermost position. Elevating plate 2 as rod 36 descends
8 also descends, and the excavation shaft 38 grasped by the chuck device 33 attached to the elevating plate 28 also descends.
That is, the excavating rod 3 connected in series with the excavating shaft 38.
Rotational force and pressing force are applied to the leading edge of the excavating head 9 to excavate. When the excavation progresses and a new excavation rod 39 is needed, is added to the lower end of the excavation shaft 38. When a new excavation rod 39 is added, the rod 36 is separated at the connecting portion 37 and the bearing 13
The bed 15 is rotated around.

Next, the chuck device 33 will be described in detail. As shown in FIGS. 9 and 10, the chuck device 33 is supported by the thrust bearing 31 of the through hole 30 formed in the elevating plate 28. The chuck device 33 includes a chuck holder 41 as a first cylindrical body. Figure 3-
As shown in FIGS. 5 and 8, the chuck holder 41 has a tubular shape in which a through hole 40 having a substantially square cross section is formed.
A diametrical expansion portion 42 is formed on the upper edge and a flange 4 is formed on the lower edge.
3 is formed. The chuck holder 41 is rotatably held by the expanded diameter portion 42 with respect to the thrust bearing 31. As shown in FIG. 4, on each of the four wall surfaces of the through hole 40, a communication groove 44 is formed as a communication passage that vertically communicates from the inner peripheral surface of the flange 43 to the opening of the through hole 40. . The inner peripheral surface of the flange 43 has a circular cross section, and the inner peripheral surface of the first tapered surface 4 has a larger diameter toward the lower side.
It is said to be 5. A male screw 46 is provided on the outer peripheral surface of the flange 43.
Are formed. Four fixing pins 47 are erected downward in bolt holes 43a formed at the tip of the flange 43 at regular intervals. A coil spring 54 is attached to each fixing pin 47 (see FIG. 6).

A chuck screw 48 as a second cylinder is attached to the chuck holder 41. As shown in FIGS. 6 and 8, a concave portion 49 having a circular cross-section that opens upward is formed at the center of the chuck screw 48. A female screw 50 is formed on the inner peripheral surface of the recess 49 and is screwed to the male screw 46 on the chuck holder 41 side. Therefore, the flange 43 of the chuck holder 41 is arranged in this recess 49 with the chuck screw 48 mounted on the chuck holder 41, and the male screw 46 and the female screw 50 are screwed together to form the chuck holder 41 and the chuck screw 48. Is relatively approached and separated. A circular groove 51 is formed on the bottom surface of the recess 49 over the entire circumference. The fixing pin 47 has the groove 51
Has been inserted into. A through hole 52 is formed downward from the bottom surface of the recess 49. The inner peripheral surface of the through hole 52 has a circular cross section, and the inner peripheral surface is a second tapered surface 53 having a smaller diameter toward the lower side. A handle hole 55 is formed on the outer periphery of the chuck holder 41 for mounting the handle H at the time of rotation of the chuck screw 48 that is bored at a predetermined interval in the axial direction.

As shown in FIGS. 6 and 8, four chuck blocks 57 as shaft fixing pieces are provided inside the chuck holder 41 and the chuck screw 48. The chuck block 57 has an excavating shaft 3 on the front surface.
The contact surface 57a has a plane shape and is in contact with the side surface of the contact surface 57. A slightly rough knurl 58 is formed on the contact surface 57a. An upper taper surface 59 and a lower taper surface 60 are formed on the back surface of the chuck block 57. Figure 9
Also, as shown in FIG. 10, the chuck block 57 is in surface contact with the first tapered surface 45 and the upper tapered surface 59, and the second tapered surface 53 and the lower tapered surface 60. Each chuck block 57 is constantly urged outward by the coil springs 54 arranged on the left and right sides thereof (see FIG. 6). Therefore, even when the excavating shaft 38 is not attached to the chuck device 33, the chuck block 57 is arranged without dropping off. As shown in FIG. 10, the communication groove 44 is arranged above the chuck block 57 when the excavation shaft 38 is mounted on the chuck device 33.

As shown in FIG. 9, a chuck opener 61 as a tightening release member is arranged above the chuck holder 41. As shown in FIG. 7, the chuck opener 61 has a disk-shaped head 62. A through hole 63 having a substantially square cross section is formed in the center of the head 62. The through hole 63 has substantially the same shape as the through hole 40 formed in the chuck holder 41. A release pin 65 as an abutting portion extends downward from the center of each of the four sides forming the inner peripheral surface of the through hole 63. Each release pin 65 is inserted into the communication groove 44, and its tip is in contact with the corresponding chuck block 57 on the upper surface (see FIG. 10).

Next, the operation of the chuck device 33 thus constructed will be described. When fixing the excavation shaft 38, the handle H is inserted into the handle hole 55 and rotated (clockwise direction when viewed from above in the present embodiment). Then, the male screw 46 and the female screw 50 are screwed together, and the chuck screw 48 approaches the chuck holder 41. With the upward movement of the chuck screw 48, the first and second
The chuck blocks 57 are pressed in the direction of the excavation shaft 38 by the tapered surfaces 45, 53 of the upper and lower tapered surfaces 59, 60, and the chuck blocks 57 surround and press the excavation shaft 38 from the four sides by the contact surfaces 57a. 10 states). In this state, a slight gap is formed between the head 62 of the chuck opener 61 and the upper surface of the expanded diameter portion 42 of the chuck holder 41. Then, the chuck device 33
When the excavation shaft 38 is removed from, the handle H is rotated in the opposite manner to the above. Then, the screwing relationship between the male screw 46 and the female screw 50 is released, so that the chuck screw 48 is separated from the chuck holder 41 direction. However, when the chuck screw 48 is tightly tightened, the knurl 58 of the chuck block 57 may bite slightly into the excavation shaft 38 and the excavation shaft 38 may not be easily removed. Therefore, chuck opener 6
The head 62 of No. 1 is tapped with a hammer (not shown). Then, the chuck opener 61 moves downward by the amount of the gap between the head portion 62 and the enlarged diameter portion 42, and the head portion 62 moves.
Abut. As a result, the chuck opener 61 cannot be lowered further. The hitting force is transmitted to the chuck block 57 via the release pin 65, and the bite is released. The tapping may be performed before loosening the chuck screw 48.

With this structure, the following effects are achieved in this embodiment. (1) When the chuck screw 48 is firmly tightened, the knurl 58 of the chuck block 57 may bite slightly into the excavation shaft 38 and the excavation shaft 38 may not be easily removed. However, since the chuck opener 61 is provided, as described above, the head 6
When 2 is tapped, the hammering force is transmitted to the chuck block 57 via the release pin 65, and the bite is released by the vibration. This allows the drilling shaft 3 to be quickly
8 can be removed, which contributes to work efficiency. (2) Since the release pins 65 of the chuck opener 61 are inserted into the communication grooves 44 and the chuck opener 61 is arranged extremely stably on the chuck holder 41, the excavator shaft 38 is not shaken quickly due to vibration. At the same time, the tip of the release pin 65 is always in contact with the chuck block 57, and in this state, a slight gap is formed between the head 62 of the chuck opener 61 and the upper surface of the expanded diameter portion 42 of the chuck holder 41. Has been done. Therefore, even if the knurling 58 of the chuck opener 61 bites into the excavation shaft 38, the gap can be eliminated by simply striking the head 62 with a hammer to move the chuck opener 61. Since it can be done, there is no need to make any preparations to eliminate the bite. At this time, since the head portion 62 abuts on the upper surface of the enlarged diameter portion 42, the head portion 62 does not descend further, and the chuck opener 61 does not fall off. (3) Four release pins 65 of the chuck opener 61 are formed in accordance with the number of the chuck blocks 57, so that when the head 62 is hit with a hammer, all the chuck blocks 57 are uniformly impacted. You can (4) The release pin 65 is inserted into the communication groove 44, which is slightly smaller than the diameter of the release pin 65. Since the release pin 65 is inserted into a substantially fitted passage, the release pin 65 rotates in the circumferential direction. There is no end. Further, it does not come into contact with the excavation shaft 38. (5) When the chuck opener 61 is divided into four by a straight line that passes through the center of the through hole 63, they are symmetrical to each other. Therefore, when arranging the chuck opener 61 on the chuck holder 41, it is not necessary to consider the left-right direction or the front position, and the communication groove 44 can be simply inserted into the desired release pin 65, and the chuck opener 61 can be placed on the chuck holder 41. It will be arranged stably.

The present invention can be modified and embodied as follows. As shown in FIG. 11, the taper portion for pressing the chuck block 57 may be configured only on the chuck holder 41 side. In the above embodiment, the male screw 46 on the chuck holder 41 side and the female screw 50 on the chuck screw 48 side are screwed together. However, as shown in FIG. 12, the screw relationship is reversed and the female screw 71 on the chuck holder 41 side is reversed. It may be screwed by the male screw 72 on the chuck screw 48 side. The means for pressing the chuck block 57 may be a means other than the sliding means by the tapered portion. In the present embodiment, four chuck blocks 57 are used to hold the substantially square-shaped excavation shaft 38 from four sides, but the shape and number of chuck blocks 57 can be freely changed depending on the shape of the shaft. Is. Knurled 58 formed on the contact surface 57a of the chuck block 57
You don't have to. Other patterns may be used when forming. The chuck opener 61 has a gap below the head 62 with the release pin 65 placed on the chuck block 57. This gives a strong impact force to the chuck block 5.
However, this gap is not always necessary. This is because it is possible to give a sufficient impact without a gap. In the above-described embodiment, the chuck opener 61 is provided with four abutting members as the release pins 65, but the shape and number can be changed. The head 62 has a ring shape, but may have another shape. -The shaft does not have to extend vertically. Other implementations are possible without departing from the spirit of the present invention.

Other technical ideas of the present invention which can be understood from the above-described embodiment will be described below as supplementary notes. (1) A chuck device characterized in that the interference with at least one of the first and second cylindrical bodies according to claim 1 is a contact relationship between the tapered portions. (2) At least one of said 1st or 2nd through-hole is equipped with the planar shape corresponding to the cross-sectional shape of the shaft body to be penetrated. The chuck device described. (3) The chuck device according to any one of claims 1 to 3 or claim 1 or 2, wherein the abutting portion corresponds to the number of the shaft fixing pieces. (4) The tightening release member includes a head portion that is separated from the first or second cylindrical body in a state where the contact portion is in contact with the shaft fixing piece, and the head portion is moved by the operation of the tightening release member. 1
The chuck device according to any one of claims 1 to 3 or appendices 1 to 3, wherein the chuck device is brought into contact with the second cylindrical body to prevent further lowering of the tightening release member.

[0018]

[Brief description of drawings]

FIG. 1 is a front view of a well excavating device to which the chuck device according to the present embodiment is applied.

FIG. 2 is an enlarged perspective view of a portion where the chuck device of the same well excavating device is mounted.

FIG. 3 is a plan view of a chuck holder.

FIG. 4 is a vertical sectional view of the same chuck holder.

FIG. 5 is a bottom view of the same chuck holder.

FIG. 6 is a plan view showing a state where a chuck block is attached to a chuck screw.

FIG. 7 is a partially cutaway perspective view of a chuck opener.

FIG. 8 is an exploded perspective view of a chuck device.

FIG. 9 is a vertical cross-sectional view illustrating a mounted state of the chuck device.

FIG. 10 is a vertical cross-sectional view illustrating a state in which the excavation shaft is inserted into the attached chuck device.

FIG. 11 is a vertical cross-sectional view illustrating a mounted state of another chuck device.

FIG. 12 is a vertical cross-sectional view illustrating a mounted state of another chuck device.

[Explanation of symbols]

38 ... excavation shaft, 40 ... first through hole, 41 ... chuck holder as first cylinder, 44 ... communication groove as communication passage, 46 ... male screw, 48 ... chuck screw as second cylinder, 50 ... female screw, 52 ... second through hole, 57
... a chuck block as a shaft fixing piece, 61 ... a chuck opener as a tightening releasing member, 65 ... a releasing pin as an abutting portion.

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) E21B 3/04 B23B 31/06 B23B 31/00 B23B 31/07

Claims (4)

(57) [Claims] 1. A first cylindrical body having a first through hole formed therein and an external thread formed on the outer circumference thereof, and a female thread formed at the second through hole formed therein and engaging with the same male thread at the inner circumference thereof. Of the first and second tubular bodies that are surrounded by at least one of the first and second tubular bodies and that relatively approach each other as the male screw and the female screw are screwed together. Interfering with at least one of the first and second
And a shaft fixing piece that is pressed toward the center of the cylindrical body, and is clamped and fixed through the coaxial fixing piece to the shaft body that is inserted into the first and second through holes. A communication passage communicating with the inside of the first or second through hole from the inside is formed in at least one of the first and second cylindrical bodies along the axial direction of the shaft body, and the communication passage is opened. A fastening release member having an abutting portion capable of abutting on the shaft fixing piece inserted into the communication passage and arranged in the communication passage is provided outside the formed cylindrical body. Chuck device. 2. The first or second tubular body is mounted around the shaft body extending in the vertical direction, and the tightening release member is arranged on either upper side of the first or second tubular body. The excavating device according to claim 1, wherein the excavator is mounted on the upper part of the one cylindrical body that is not in contact with the shaft body. 3. The abutment portion is inserted into the communication passage in a state in which the tightening release member is placed on the upper part of either the first or second cylindrical body arranged on the upper side. The chuck device according to claim 2, wherein: 4. The chuck device according to claim 2, wherein the tightening release member includes an annular main body that surrounds the shaft body.