JPS63176585A - Hammer drilling machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hammer excavator that is particularly effectively used for drilling holes in hard ground such as rock.

(Prior Art) Conventionally, this type of hammer excavator is equipped with a single disk-shaped striking bit at the lower end of the rod that is continuously driven up and down by compressed air, and excavates hard ground by continuous striking of the bit. 2. Description of the Related Art Downhole hammer excavators are known that discharge excavated earth and sand to the ground by jetting compressed air. However, since this conventional machine performs drilling only by striking a single bit, it not only has low drilling capacity, but also requires a large-diameter, heavy-weight machine when drilling large-diameter holes. Since a bit is required and the bit drive mechanism for moving the bit up and down is also large-sized, the overall weight is unnecessarily high.

(Problem that the invention attempts to solve) The present invention aims to eliminate the drawbacks of conventional machines.

(Means for Solving the Problems) In order to achieve the above object, the hammer excavator of the present invention has a striking bit that is continuously driven up and down on the lower end surface of the casing and has a diameter of at least one row of the lower end surface of the casing. A plurality of hitting bits were arranged and protruding in the direction, and each of the hitting bits was configured to be able to rotate freely on its own axis by a rotational drive mechanism, and to be able to revolve around the center of the lower end surface of the casing as a whole.

It is characterized by The present invention will be described in detail below with reference to the drawings.

In Figure 1.2, a leader mast (2) is mounted vertically on the front of the base machine (1), and a carrier (4) is slid onto a guide rail (3) provided on the front of the mast (2). The carrier (4) is movably engaged and suspended by a wire (5) so as to be movable up and down, and the hammer excavator (6) is supported by the carrier (4).

The hammer excavator (6) includes a bit rotation (rotation) motor (7) placed on the carrier (4) and a speed reducer (
8), a bit rotation (revolution) mechanism (
9), a cylindrical casing (10) made of a steel pipe connected below the casing (10), and three striking bits protruding from the lower end surface of the casing (10) in a row in the diametrical direction of the lower end surface in this example. (11) Consists of...

First, for convenience, the bit turning mechanism (9) will be explained.

The turning mechanism of this example is an example in which the entire bit (11) is revolved by rotating the casing (10). In FIG. 4, a cylindrical cover (12) is fixed concentrically to the lower surface of the reducer (8), and the cover (12)
) A flat hollow gear box (13) is concentrically connected to the lower end of the box (13), and an annular bearing part (14) projecting downward into the box (13) is provided at one end of the rotating cylinder (15). A ring-shaped large gear (16) is rotatably supported via a ball bearing (17), and the rotary cylinder ([5]
The lower flange part (18) of the casing (10)
A hydraulic motor (20) for bit rotation (revolution) is fixed concentrically to the upper surface of the gear housing (19) at the upper end, and on the left and right sides of the upper surface of the gear box (13).
), the output shafts (21), (21) of both motors protrude into the gear box (13), and the small gears (22), (22) fixed to the protruding parts are attached to the large gear (16). Each is interlocking. (23) is a cylindrical bearing tube protruding from the center of the lower surface of the gear box (13), and rotatably supports the rotary tube (15) on its inner surface.

Next, the rotation (rotation) mechanism of the bit is as follows. In Fig. 3, within the lower end of the casing (10), three cylindrical bit continuous vertical drive mechanisms (24) using normal compressed air are oriented parallel to the casing axis and attached to the bearing portion (30). The hitting bits (11), which are rotatably supported by the driving mechanism (24) and protrude from the lower end of each drive mechanism (24) so as to be freely retractable, have a substantially circular shape with a number of tips protruding from the lower hitting surface. They are plate-shaped, and in this example, the bits are placed close to each other when viewed from the bottom as shown in Figure 5, and the bits (11) on both sides are placed in the casing (10).
) project slightly outward from the outer circumferential surface, and as shown in the third figure, the center bit (11) is connected to the bits (11) on both sides when viewed from the front.
11), the hollow rotating shaft (25) connected to the upper end of the drive mechanism (24), which is displaced downward at an appropriate level from the drive mechanism (24), is mounted inside the casing (10). Extending upward in parallel, the upper ends of the extensions protrude into the gear housing (19) and are rotatably supported by thrust bearings (26), respectively;
Gears (27) each fixed to the upper end of the shaft are meshed with each other in three series, while the gears (27) are connected to the cover (
12) A hollow intermediate shaft (29) is attached to the output shaft (28) protruding inside.
), and the intermediate shaft (29) passes through the rotating cylinder (15) and is connected to the central rotating shaft (25). (
31) is a swivel provided in the middle part of the intermediate shaft (29), (32), (32) are rotation shafts (25) on both left and right sides, (
The swivels are attached to the upper ends of the swivels (25), and these swivels pass through the hollow rotating shafts (29), (25)... to drive each bit continuous vertical drive mechanism (24)... and squeeze for soil removal. Air is pumped through each. The swivels (32), (32) are each connected to another swivel (not shown) installed at the fitting part of the bearing sleeve (23) and the rotating sleeve (15), and The swivel and the swivel (31) are connected to the near compressor. In FIG. 5, (33) (33), ... are each bit (
11) It is an injection port for compressed air for soil removal that is opened on the lower surface.

The effect of this example is as follows. When the motor (7) is started, the output shaft (28) rotates through the intermediate shaft (29) and the gear (2).
7)... is transmitted to each rotating shaft (25)..., thereby causing each bit continuous vertical drive mechanism (24)... and bit (11)... to rotate in opposite directions, Also, when the hydraulic motors (20) and (20) are started, their output shafts (
The rotation of (21), (21) is the small gear (22), (22)
, the large gear (16), the rotating cylinder (15) and then the casing (
10), thereby causing each bit (11) to revolve in its entirety together with the recasing (10). In that state, compressed air is sent from the swivels (31), (32), (32) to each bit drive mechanism (24) via the hollow rotating shaft (25)...
When the hammer excavator (6) is lowered into the hard ground, each bit (11) starts to move up and down continuously to perform impact excavation of the hard ground. Compressed air is injected into the excavation hole from the injection ports (33) (33), etc. on the lower surface, and the excavated soil is released from the ground through the gap between the inner wall of the excavation hole and the outer circumferential surface of the casing (10) (Fig. 5 d). Earth is blown out and excreted. During excavation with the bit, each of the bins 1 to (11) rotates and revolves around its own axis while continuously being struck, thereby exerting a strong excavating force. Also, among the three bits, the center bit (11), which has been displaced downward, first performs a small-diameter pilot excavation, and then the bits (11) on both sides excavate in a circular pattern around it to achieve the desired result. Since the hole is drilled with a diameter of

Further, regarding the wear and tear of the chip of each bit (11), since each bit rotates on its own axis, uneven wear is eliminated, and the service life of the bit is extended.

The bits (11) are not limited to being arranged in the diametrical direction of one row, but may be arranged in multiple rows in the diametrical direction (for example, in a cross row). Also, adjacent bits may overlap each other slightly.

As another example, one or both of the rotation and revolution mechanisms of each bit is housed inside the casing (10), and the casing (10) is prevented from rotating.
The specific structure thereof may be appropriately changed in design according to the above.

(Effects of the Invention) The hammer excavator of the present invention has a plurality of bits protruding from the lower end surface of the casing in at least one row in the diametrical direction, so it is different from the conventional one having one bit. Compared to hammer drilling machines, the overall weight can be reduced, and this advantage is particularly noticeable in hammer drilling machines for drilling large-diameter holes. By rotating while rotating, it is possible to exert a superior digging force than the continuous impact with a single bit of conventional machines, and it is also possible to eliminate uneven wear of each bit and extend the service life of the bit. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view, FIG. 2 is a front view, FIG. 3 is an enlarged half-cut front view of the lower part of the hammer excavator, and FIG. 4 is a further enlarged view of the upper part of the same. A longitudinal front view, and FIG. 5 is an enlarged bottom view of the same. 6...Hammer excavator, 7...Motor, 8...Reducer. 10...Casing, 11...Blowing bit, 20...
...Hydraulic motor, 24...Bit continuous vertical drive mechanism.

Claims (1)

[Scope of Claims] A plurality of striking bits that are continuously driven up and down are provided on the lower end surface of the casing in a row extending in a diametrical direction in at least one row on the lower end surface of the casing, and each of the striking bits is driven by a rotational drive mechanism. A hammer excavator characterized in that it is configured to be freely rotatable and each striking bit as a whole can freely revolve around the center of the lower end surface of the casing.