JP3409916B2 - Drilling rod coupling device in excavator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relies on a screw auger, a casing auger, and other excavating members (hereinafter collectively referred to as excavating rods) in an excavator. The present invention relates to a drilling rod connecting device for performing drilling. 2. Description of the Related Art Conventionally, as an excavator for performing excavation work by adding a drill rod of this type, for example, Japanese Patent Publication No. 63-56
No. 398 is disclosed. In this excavator, the upper end of a drilling rod is automatically connected to an output shaft of a drive unit that is supported by a tower so as to be able to move up and down. [0003] However, as shown in FIG. 1, a dumping hopper 3 is provided below the driving unit 1 so as to insert a drilling rod 2, and a lower portion of the dumping hopper 3 is provided. When the device of the above-mentioned publication is applied to a so-called excavator having a structure in which excavated earth and sand is discharged from the discharging port 4 of FIG. 10, one pile (drilling rod) as shown in FIGS. When the excavating rod 2 is reconnected after the above operation is completed, the connecting portion between the excavating rod 2 and the drive unit 1 is located above the height of the discharging hopper 3, and the attaching / detaching work of the connecting unit 5 is performed. However, it is difficult to apply to an excavator having this type of unloading hopper 3 because the work is performed at a high place, resulting in poor workability and a danger. [0004] In view of the above, the present invention facilitates the extension of a drilling rod not only in a normal excavator but also in an excavator having a disturbing member such as an unloading hopper at a lower portion of a drive unit. The purpose of the present invention is to provide a connecting device for excavating rods. [0005] As means for solving the problems of the above-mentioned prior art, the present invention provides a method for rotating a drilling rod connected to a drive unit which can move up and down along a tower. An excavator for boring a pit therein, having a base rod that is connected to an output shaft of the drive unit and hangs down,
The base rod has a hydraulic chamber formed therein and connected to a hydraulic supply source, a piston built in the hydraulic chamber and slidable in the axial direction of the rod, and slidably fitted on the outer periphery of the rod. An outer shell member which is combined with the piston and slides integrally therewith, and a female joint portion for excavating rod connection formed at a lower end portion of the rod and which is fitted to a male joint portion of the excavating rod. In the part, a lock member that is detachable from the lock groove of the male joint part of the excavation rod is provided so as to be able to protrude and retract in the radial direction, and this lock member is made to protrude and retract by the vertical movement of the outer shell member. I do. When the excavation with one excavating rod is completed, pressurized oil is supplied to the lower side of the piston in the hydraulic chamber in the base rod, and the piston is raised to form an outer shell substantially integral with the piston. The members are raised together, the locking member is pulled out at the lower end, and the locking member unlocks the drilling rod. Next, the drive unit is raised, and a drilling rod to be extended is hung below the drive unit, and the drive unit is lowered to fit the female joint of the base rod into the male joint at the upper end of the drill rod. At this time, the lock member is located at the retracted position, and the inner end thereof is recessed from the inner surface of the female joint portion, and is fitted smoothly. [0007] After fitting the two joints, pressurized oil is supplied to the upper side of the piston in the hydraulic chamber in the base rod, and the outer shell member is lowered by lowering the piston. Moves toward the center, and the connection is completed. The present invention will be described below with reference to an embodiment shown in the drawings. [0009] The excavator in the embodiment shown in the figure exemplifies a case where the excavator is provided with an earth removal hopper 3 as shown in FIG. 1 described above, and this excavator follows a tower 7 installed upright on a working machine 6. As shown in FIG. 2, a hydraulic double swivel device 9 is provided on the output shaft 8 of the drive unit 1 which can be moved up and down, and a base rod 11 is connected and suspended via an upper rod 10. The driving unit 1 is suspended by a wire 13 passing through a sheave 12 at the upper end of the tower 7, and the wire 13 is adapted to be hoisted and lowered by a winch 14 on the working machine 6. A discharging hopper 3 is provided below the driving unit 1 so as to be supported by the tower 7, and a lower end of the base rod 11 is slightly protruded from a lower end of the discharging hopper 3. In FIG. 1, reference numeral 15 denotes a stay. As shown in FIGS. 3 and 4, a cylindrical hydraulic chamber 16 extending in the axial direction is provided inside the base rod 11.
The piston 17 is inserted inside the hydraulic chamber 16 via a seal so as to be slidable in the axial direction. In this embodiment, a chemical solution (such as cement slurry, water,
A pipe 18a connected to a passage 18 for injecting other fluid) is inserted through the pipe 18a.
The hole at the center of the shaft is inserted through a seal and is slidable. The upper and lower sides of the hydraulic chamber 16 are connected to hydraulic pipelines 19 and 20 for supplying or discharging hydraulic oil from a hydraulic unit installed on the ground.
Hydraulic chamber 16 through passages 21 and 22 in base rod 11
Is communicated to. The upper part of the hydraulic lines 19 and 20
The oil passages 9a and 9b of the double swivel device 9 are communicated with each other. The ends of the oil passages 9a and 9b are always communicated with the fixed oil passages 9c and 9d. Leads to. The lower part of the hydraulic chamber 16 is communicated with a passage 23 formed in the axial direction of the piston 17. A cylindrical outer shell member 24 is axially slidably fitted around the outer periphery of the base rod 11.
4 and the piston 17 are connected by a connecting pin 26 through a cutout 25 formed in the base rod 11, and the piston 17
The outer shell member 24 moves together with the movement. A screw blade 36 is provided on the outer periphery of the outer shell member 24.
Is wound. The outer shell member 24 includes a base rod 1
Detent member 2 acting as a detent key for 1
7, 27 are fixed at positions symmetrical in the diameter direction with screws or the like,
The inner ends of the detent members 27, 27 are grooves 2 formed over a predetermined length range in the axial direction of the outer peripheral surface of the base rod 11.
8, 28 are fitted. At the lower end of the base rod 11, a female joint 29 is formed as shown in section in FIG. 6, and two locking members 30, 30 are formed in the radial direction of the female joint 29 in the radial direction. It is provided to be able to come and go. In the illustrated embodiment, the positions where the left and right lock members 30, 30 are provided are stepped up and down so as to prevent a decrease in strength due to a decrease in the cross-sectional area of the portions. It may be provided as. At the upper end of the excavated rod 31 to be rehabilitated, a male joint part 32 is provided which can be fitted as closely as possible to the female joint part 29 of the base rod 11. When the lock member 30 is completely fitted into the female joint portion 29,
Lock groove 3 consisting of a recess at a position matching the inner end of 30
3, 33 are formed. The male joint 32 and the female joint 29 are
It has a hexagonal cross section in order to transmit rotation. The lock member 30 has a head portion 30a as shown in an enlarged view in FIG. 5, and a portion to be inserted into the peripheral wall portion 29a of the female joint portion 29 is a flat plate portion 30b.
A small diameter portion 30c is formed between the flat plate portion 30b and the head 30a, an end surface of the flat plate portion 30b facing the head 30a side is an upward tapered surface 30d, and a lower surface side of the head 30a is The tapered surface 30e is in a direction parallel to the tapered surface 30d. The head 30a is fixed to the small diameter portion 30c by a bolt 30f as a separate member in manufacturing the lock member 30. The lower end of the outer shell member 24 is bifurcated so as to fit into the small diameter portion 30c and has a locking member 30.
A downward tapered surface 24a and an upward tapered surface 24b are formed at locations corresponding to the tapered surfaces 30d and 30e of the lock member 30. When the outer shell member 24 is lowered, the tapered surface 24a of the lock member 30 is tapered. The locking member 30 is formed so as to be pushed in the axial direction of the male joint portion 32 of the excavating rod 31 by pressing the surface 30d, and when the outer shell member 24 rises, the tapered surface 24b thereof presses the tapered surface 30e of the locking member 30 to lock. Member 30
Is formed so as to be pulled out. Next, the operation of the above embodiment will be described. When the digging operation with one digging rod 31 has been completed and the digging rod for extension is to be extended and the operation is to be continued, the passage 22 is formed below the piston 17 of the hydraulic chamber 16 in the base rod 11. , 23 and pressurizes the piston 17, the pressure oil above the hydraulic chamber 16 passes through the passage 2.
1 and the piston 17 rises. As the piston 17 rises, the outer shell member 24 integrated therewith via the connecting pin 26 also rises, and the tapered surface 24b at the lower end thereof locks the lock member 30.
The locking member 30 is gradually pulled out by contacting the tapered surface 30e, and the locking of the male joint portion 32 of the excavation rod 31 by the locking member 30 is released. Next, as shown in FIG. 9A, when the drive unit 1 is raised, the space between the base rod 11 and the underground excavation rod 31 is vacant, and the next excavation rod to be extended below the base rod 11 is opened. The female joint portion 29 of the base rod 11 is fitted to the male joint portion 32 at the upper end of the excavation rod 31 '(FIG. 9B). After fitting the two joints 29 and 32 in this way, pressurized oil is supplied to the upper side of the piston 17 of the hydraulic chamber 16 in the base rod 11 through the passage 21 of the base rod 11 and the piston 17 is lowered. , The outer shell member 24 is also lowered, and the tapered surface 24a at the lower end thereof is
The lock member 30 advances in the axial direction of the male joint portion 32 in contact with the tapered surface 30d of the male member 32, and the tip of the lock member 30 engages with the lock groove 33 of the male joint portion 32 to be locked (FIG. 9 ( C)). In the illustrated embodiment, the case where the earth removal hopper 3 is provided as a member that becomes an obstacle when connecting the excavation rod is described. Of course, it can be applied without any obstacles. As described above, according to the present invention, even if the excavator is provided with a member such as an unloading hopper below the drive unit, the extension of the excavating rod is unloaded. The operation can be performed at a position protruding from the lower part of the hopper, and therefore, the operation is performed at a position lower by the height of the discharging hopper, so that the workability can be remarkably improved and the safety can be enhanced. In addition, since the working part when adding the excavation rod is performed by the operation of the piston incorporated in the base rod, there is no extra equipment or members around the rod, and it is possible to configure a compact form. There are various effects such as being able to be made and no intrusion of earth and sand.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall side view showing an example of an excavator to which the present invention is applied. FIG. 2 is a front view partially in section showing a connection position of a base rod which is a main part of the present invention. FIG. 3 is a cross-sectional view showing a state in which the base rod and the excavation rod are locked. FIG. 4 is a sectional view showing a state at the time of unlocking; FIG. 5 is an enlarged perspective view of a lock member. FIG. 6 is a sectional view of a portion corresponding to AA in FIG. 3; FIG. 7 is a sectional view of a portion corresponding to BB in FIG. 4; FIG. 8 is a sectional view of a portion corresponding to CC in FIG. 3; 9 (A) to 9 (C) are operation explanatory diagrams. FIGS. 10A and 10B are explanatory diagrams showing a problem of the related art. [Description of Signs] 1 Drive unit 3 Unloading hopper 7 Tower 9 Double swivel device 11 Base rod 16 Hydraulic chamber 17 Piston 24 Outer shell member 26 Connection pin 27 Detent member 29 Female joint unit 30 Lock members 30d, 30e Tapered surface 32 Male joint 33 Lock groove

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Isamu Yamanoi 1293, Tento-cho, Hanamigawa-ku, Chiba-shi, Chiba Sanwa Equipment Co., Ltd. Chiba Plant (56) References JP-A-7-113392 (JP, A) 6-27990 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21B 17/02-17/04 E21B 17/046-17/07 E21B 19/16-19/18

Claims (1)

(57) Claims: 1. An excavator for drilling a pit in the ground by rotating a drilling rod connected to a drive unit that can move up and down along a tower. It has a base rod that is connected to the output shaft and hangs down. The base rod is formed inside the hydraulic chamber connected to a hydraulic supply source, and is built in the hydraulic chamber and slidable in the axial direction of the rod. A piston, an outer shell member slidably fitted to the outer periphery of the rod, connected to the piston and sliding integrally with the piston, and fitted at a lower end of the rod to a male joint of a drill rod. A female joint portion for connecting the excavation rod, and a lock member capable of engaging and disengaging from a lock groove of the male joint portion of the excavation rod is provided in the female joint portion so as to be able to protrude and retract in the radial direction. That the member moves up and down Coupling device drill rod in the drilling machine according to symptoms.