JPH0551755B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an excavation device, and more particularly to an excavation device that more effectively prevents a bit device from falling off from a device.

(Prior Art) Conventionally, an excavating device shown in FIG. 3 has been commonly used. The drilling equipment shown in FIG. 3 uses the rotating force of the hammer cylinder 100 and the hammer cylinder 100
Excavation is performed by impact force applied from above to the top of the cylindrical body 102 by a hammer (not shown). During excavation, the hammer cylinder 100 rotates in the direction of arrow A, and the device 104 also rotates in the same direction. The bit device 106 for drilling is the device 10.
It is screwed onto the bottom of 4. In addition, eccentric reamer 1
08 is loosely fitted onto the shaft 101. device 10
When the reamer 4 rotates, the bit device 106 and the eccentric reamer 108 also rotate in the same direction to perform excavation.

In the case of the drilling equipment shown in FIG.
6 must be set to be less than the inner diameter of the excavation pipe 112. This is for inserting and removing the bit device 106. Therefore, since the size of the bit device 106 is restricted, it has been impossible to drill a large diameter hole with a small diameter bit device 106.

In order to solve this problem, the present inventor first developed a device that receives the impact force of the hammer and the rotational force of the hammer cylinder, and that has two shaft holes at symmetrical positions on the bottom surface. It consists of two roughly semicircular blocks, each with a shaft upright on its top surface to be rotatably inserted into each shaft hole, and arranged on the bottom surface of the device so that the straight end surfaces face each other. Each axis is the upper surface of each block body, and when the device rotates in the digging direction, one end of each block body is provided with a predetermined amount of excavation from the outer peripheral surface of the device. We have developed and applied for a drilling device that is installed vertically in a position that projects only a small amount (Japanese Patent Application No. 152126/1983). According to this excavation device, when the device rotates in the excavation direction, both blocks rotate around the axis, and one end of each protrudes from the outer peripheral surface of the device by a predetermined amount of excavation. , a wider area than the bottom area of the device can be excavated with the bit equipment.

(Problems to be Solved by the Invention) However, although the above-mentioned patent application No. 61-152126 has a remarkable effect in that the bit device can excavate a wider area than the bottom area of the device, it has the following problems. There is a point.

As a means for rotatably inserting and holding the shaft installed upright into the shaft hole of the device, a male thread is formed at the tip of the shaft, and the device is inserted into the male thread. It has been proposed that each block can be rotated relative to the device by screwing together a nut, but when attached by screwing, loosening occurs due to rotation or vibration of the block, and in severe cases, There is a problem that the block body may come off from the device.

Therefore, it is an object of the present invention to provide a drilling device which has a simple structure and is capable of rotatably inserting and holding a shaft provided upright on a block body constituting a bit device into a shaft hole of a device. With the goal.

(Means for Solving the Problems) In order to solve the above problems, the present invention has the following configuration.

In other words, it advances in response to the impact force of the hammer and the rotational force of the hammer cylinder, and consists of a device with two axial holes provided in point-symmetrical positions on the bottom surface, and two approximately semicircular block bodies. , a shaft that is rotatably inserted into each shaft hole is erected on the top surface of each device, and a bit device is provided on the bottom surface of the device so that the straight end surfaces thereof face each other; is the upper surface of each of the block bodies, and when the device rotates in the excavation direction, the opposing straight end faces come into surface contact to restrict mutual rotation of both block bodies, and One end of each of the block bodies is made to protrude from the outer peripheral surface of the device by a predetermined amount of excavation, and when the device is rotated in the opposite direction to the excavation direction, the outer peripheral edges of both block bodies are made to protrude from the outer peripheral surface of the device. The excavation equipment is installed in an inner position, and the outer circumferential surface of each shaft is provided with a groove in the circumferential direction, and the device has one end opening to the outer circumferential surface of the device and the other end opening to the outer circumferential surface of the device. are provided in each of the shaft holes and open at positions corresponding to the grooves of each of the shafts being inserted, and are inserted and fixed from one end side of each of the through holes, and Each tip is provided with two pins that fit into the grooves of the respective shafts inserted into the respective shaft holes.

(effect) The operation will be explained with reference to FIG.

A shaft 11a erected on the upper surface of the bit device 14a
is rotatably inserted into a shaft hole 13a drilled in the device 12, and the tip of a pin 15a press-fitted from the side of the device 12 fits into a groove 19 carved on the outer periphery of the shaft 11a. Therefore, even if the direction of rotation of the bit device 14a changes, the bit device 14a can be prevented from falling off from the device 12.

(Embodiments) Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

First, the configuration will be explained in detail. In FIGS. 1 and 2, 10 is a hammer cylinder which has a suitable hammer piston (not shown) built therein and is rotated about its axis by a suitable power source (not shown).

A female thread is cut on the inner wall of the lower end of the hammer cylinder 10, and a fixture 20 is screwed into the inner wall.
The fixture 20 is hollow and has a protrusion 22 provided inside. Reference numeral 12 denotes a device having a spline groove 24 integrally formed in its upper part, a cylindrical body 13 fixed to the upper part, and a collar 26 fixed to the body of the cylindrical body 13.

To attach the device 12 to the hammer cylinder 10, the fixture 20 is fitted onto the device 12 such that the protrusion 22 on its inner surface engages the spline groove 24, and then the collar 26 is secured to the cylindrical body 13 and fixed. It may be screwed onto the lower part of the hammer cylinder 10 using the tool 20. device 12 is color 26
Since it hits the fixture 20, it is prevented from coming off, and since the spline groove 24 engages with the protrusion 22, it rotates together with the hammer cylinder 10.

The aforementioned hammer piston strikes the top of the cylinder 13.

A hooking protrusion 30 is provided on the outer periphery of the device 12 and is hooked onto a step 32 provided on the pipe 18. Furthermore, the device 12 is cut with suitable drainage grooves 34.

Bit devices 14a and 14b are two block bodies each having a substantially semicircular shape in plan view. A shaft 11a is provided upright on the upper surface of the block body of each bit device 14a, 14b. The shaft 11a is a circular bottom surface of the device 12, and is rotatably inserted and held in a pair of shaft holes 13a bored at positions point symmetrical with respect to the center of the bottom surface of the device 12. The straight end faces of the bit devices 14a, 14b are opposed to each other. The shaft 11a is connected to each bit device 1.
When the device 12 rotates in the excavation direction (direction of arrow A) on the top surface of the bit device 14a, 14b, the opposing straight end surfaces come into surface contact with each other, as shown in FIG. , 14b, and one end of each of the bit devices 14a, 14b is erected at a position where it can protrude from the outer peripheral surface of the device 12 by a predetermined amount of excavation.

FIG. 2 shows one bit device 14a.

Reference numeral 11 denotes a shaft, and a concave groove 19 is carved in the upper part of the shaft over the entire circumference in the circumferential direction on the outer circumferential surface.

The width and depth of the groove 19 are set so that the tip of a pin, which will be described later, can be sufficiently inserted therein. The bit device 14a is fixed to the device 12 by inserting it into the shaft hole 13a bored in the bottom of the device 12, as described above.
At this time, the device 12 has one end opened on the outer peripheral surface of the device 12, the other end opened in the shaft hole 13a, and a through hole 17a perpendicular to the shaft hole 13a. When inserted into the shaft hole 13a, the position of the through hole 17a is formed to correspond to the groove 19 of the shaft 11a. Here, the pin 15a is press-fitted into the through hole 17a, and the pin 1
The bit device 14a is rotatably attached to the device 12 by fitting the tip of the bit device 5a into the groove 19 of the shaft 11a. Similarly, the bit device 14b
is also attached to the device 12.

Next, the operation will be explained in detail.

When the hammer cylinder 10 receives power and rotates in the direction of arrow A, the device 12 and the bit device 14
a and 14b also rotate in the same direction.

Further, when a hammer piston (not shown) disposed in the hammer cylinder 10 applies an impact force to the top of the cylindrical body 13 from above, the bit devices 14a, 14
b thrust into the ground and bit 36 due to rotational force.
excavates the earth and stone.

When the hammer cylinder 10 rotates, the bit devices 14a, 14b together with the device 12 begin to rotate in the direction of arrow A.

Furthermore, since both bit devices 14a and 14b receive the force of forward excavation from a hammer piston (not shown), one end thereof protrudes a predetermined amount from the outer periphery of the device 12 due to the excavation resistance force, as shown in FIG. Excavate with bit 36.

In this state, the bit devices 14a, 14b receive the rotational force of the hammer cylinder 10 and perform digging.

Furthermore, the impact force of the hammer is added and it moves forward underground.

After excavation is completed, the bit devices 14a, 14b, etc. are removed from the excavation pipe 18. At that time, when the hammer cylinder 10 is rotated in the direction of arrow B, the bit devices 14a, 14b operate in the opposite direction to that during excavation to reduce the diameter. is equal to or smaller than the lower end of the device 12 and can slide inside the excavation pipe 18, so that by pulling out the hammer cylinder 10, the entire device can be removed.

Even if the bit devices 14a, 14b rotate in the reverse direction at this time, the bit devices 14a, 14b are not screwed onto the device, but are engaged with pins and grooves as described above.
There is no risk that b will fall off from the device 12.

In the above embodiment, two semicircular bit devices are used, but a single bit device as shown in FIG. 3 may be used in an apparatus having an eccentric reamer.

Although the present invention has been variously explained above using preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

(Effects of the Invention) According to the excavation device of the present invention, the bit device and the device can be connected by inserting a pin into a through hole drilled in the device, and inserting the tip of the pin into the concave groove of the shaft provided upright in the bit device. Since the structure is such that the bit device is inserted into the device, it is possible to prevent the shaft from coming out of the shaft hole of the device, and thereby prevent the bit device from coming off from the device, and also to allow the bit device to rotate around the shaft relative to the device. can. Therefore, the bit device can be rotatably held in the device with an extremely simple structure, and other effects are achieved.

[Brief explanation of the drawing]

Fig. 1 is a front cross-sectional view showing the main parts of the drilling equipment according to the present invention, Fig. 2 is a front view of the bit equipment, and Fig. 3 is a front view showing the main parts of the conventional drilling equipment. FIG. 10... Hammer cylinder, 11a... Shaft,
12...Device, 13a...Shaft hole, 15a...
Pin, 17a...through hole, 19...concave groove.

Claims (1)

[Scope of Claims] 1. A device that advances in response to the impact force of the hammer and the rotational force of the hammer cylinder, and that has two shaft holes provided in point-symmetrical positions on the bottom surface, and two devices that form a substantially semicircular shape. It consists of a block body, each of which has a shaft erected on its upper surface to be rotatably inserted into each of the shaft holes, and a bit device disposed on the bottom surface of the device so that the straight end surfaces thereof face each other. Each of the shafts is a top surface of each of the block bodies, and when the device rotates in the excavation direction, the opposing straight end faces come into surface contact with each other to prevent mutual rotation of both block bodies. At the same time, one end of both block bodies is made to protrude from the outer peripheral surface of the device by a predetermined amount of excavation, so that when the device rotates in the opposite direction to the excavation direction, the outer peripheral edge of both block bodies The excavation equipment is installed upright at a position inside the outer circumferential surface of the device, and the outer circumferential surface of each of the shafts is provided with a groove in the circumferential direction, and the device has one end on the outer circumferential surface of the device. Two through holes are provided, the other end of which is open in each of the shaft holes, and which opens at a position corresponding to the groove of each of the shafts inserted, and the two through holes are inserted from one end side of each of the through holes. 2. An excavating device, characterized in that the excavation device is fixed and has two pins each having a tip that fits into a groove of each of the shafts inserted into each of the shaft holes.