JPH0451637B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an automatic excavator-type earth drill equipped with a drive device for rotating a bucket.

(Prior Art) The present inventors proposed that, like a conventional earth drill,
Instead of attaching the bucket to the lower end of the telescopic Kerry bar, we have developed a system in which the bucket is rotatably attached to an attachment supported by the arm of a working machine, and a bucket drive motor is mounted on the attachment. This structure does not require the kely bar required for conventional earth drills, and is also characterized in that it can be easily attached to various working machines and can be used to drill vertical holes. This earth drill has a bottom cover that can be opened and closed using a pivot pin, just like before.To open the bottom cover, turn the handle that protrudes from the top of the bucket, just like before. Open the bottom cover by turning the latch that holds it in place, and then lift the bottom cover by hand to close it. Furthermore, in conventional earth drills, the bottom cover is closed by grounding the bottom cover and lowering the bucket.

(Problems to be solved by the invention) As described above, in the conventional earth drill,
The bottom cover is opened by turning the handle by hand, and when it is closed, the bottom cover must be lifted manually, or the bottom cover must be grounded and the bucket lowered, which is labor-intensive, troublesome, and dangerous. There was a problem.

(Means for Solving the Problems) In order to automate the opening and closing of the bottom cover, the earth drill of the present invention includes a drive motor for the earth drill bucket mounted on an attachment attached to a movable support, and the drive motor for the earth drill bucket is mounted on the attachment. A rotary body rotated by a drive motor is provided to protrude downward, an earth drill bucket having an openable and closable bottom cover is attached to a lower part of the rotary body, and a cylinder for opening and closing the bottom cover is installed in the earth drill bucket. The invention is characterized in that the rotating body is provided with rotational connection means for the working medium of the cylinder.

(Example) An example of the present invention will be described below with reference to FIG. Reference numeral 1 denotes an attachment connected to and supported by the arm A of the working machine.As an example of the working machine, as shown in Utility Application No. 60-36136 by the present inventors, a self-propelled working machine is used. A horizontal extendable arm is attached to the loading platform via a swivel platform, and an arm is attached to the tip of the arm to removably attach a work tool such as a bucket bag, etc., but there are other types that have an undulating arm or a hanging arm. , other working machines that can provide excavation reaction force can be used. Alternatively, a bucket can be attached to a stationary movable support.

The attachment 1 is a cylindrical body 1A connected to the arm by a pin (2 is a pin hole) or the like.
and a hollow body 1B connected to the cylindrical body 1A with bolts 3. A rotating cylindrical body 7 is rotatably attached to the hollow body 1B concentrically with the cylindrical body 1A by means of upper and lower bearings 5 and 6 so as to protrude downward, and a gear 8 is fitted into the rotary cylindrical body 7. It is worn.
Further, a hydraulic drive motor 9 is installed on the hollow body 1B, and a gear 10 attached to the output shaft of the drive motor 9 is meshed with the gear 8.

A flange 11 is welded to the lower end of the rotating cylinder 7, and the flange 11 is connected to the top plate 13 of the cylindrical bucket 12 with bolts 14, so that the bucket 12 is installed concentrically with the rotating cylinder 7. ing. The bottom opening of the bucket 12 has a bottom lid 1.
6 is attached so that it can be opened and closed about a pivot pin 15.

Reference numeral 17 denotes a hydraulic cylinder for opening and closing the bottom cover 16, and the end of its tube 17a is connected by a pin 19 to a bracket 18 welded to the lower surface of the bucket top plate 13 on the pivot pin 15 side, and the piston rod 17b is connected to the bottom. It is connected to a pin 21 and attached to a bracket 20 welded to the upper surface of the lid 16 on the pivot pin 15 side. The cylinder 17 and the bottom cover 16 can be connected to each other in various ways other than this example. For example, the connection can be made using a connecting member such as a rope or a chain.

The circuit for supplying hydraulic oil to the cylinder 17 may be provided with a circuit separate from the drive motor 9, but in this embodiment, pipes 22 and 23 connected to a hydraulic power source installed in a working machine or the like (not shown) are used. A valve device 24 is installed on the hollow body 1B so as to be shared by the drive motor 9 and the cylinder 17, and is configured to supply hydraulic oil via a rotation joint 25.

FIG. 2 is a diagram showing the configuration of the rotating joint 25, in which a circular hole 33 is bored in the center of the top plate portion 13 corresponding to the lower surface of the rotating cylinder 7, and a circular hole 33 is formed in the lower part of the circular hole 33. A cylindrical body 34 constituting the rotating joint 25 is fixed by welding or the like, and a rod 28 with a circular cross section is inserted into the cylindrical body 34, the rotating cylindrical body 7, and the circular hole 33 via upper and lower bearings 26, 27. are fitted in a relatively rotatable manner, and within the rod 28 are
Two oil holes 29, 30 are provided, each oil hole 29,
30 are connected to the valve device 24 via conduits 31 and 32, respectively. On the other hand, the inner periphery of the cylindrical body 34 has grooves 35 and 36 that communicate with the oil holes 29 and 30, respectively. Road 39,
It communicates with the bottom chamber and rod chamber of the cylinder 17 via 40.

FIG. 3 shows the drive motor 9 and cylinder 17.
This is a hydraulic circuit diagram of a hydraulic pump 43 and an oil tank 44 mounted on a working machine body (not shown).
The circuits 31 and 32 are provided to connect the secondary circuits 41 and 42 of the control valve 45 of the drive motor 9 to which the primary circuit is connected to the cylinder 17,
A control valve 45 for the cylinder 17 is inserted into the circuits 31 and 32, and the cylinder 17 is operated only when the control valve 45 is switched to the left position in the drawing (at this time, pressure oil is supplied to the drive motor 9.
Since this is blocked by the check valve 47 inserted into the circuit 42, the drive motor 9 is brought to a halt. ), by configuring the cylinder 17 to be expandable and retractable by switching the control valve 45, the number of hydraulic hoses extending from the working machine body to the attachment 1 is reduced, making hose handling easier. Note that instead of making the cylinder 17 a manual type,
Cylinder 17 can be operated by remote control as an electromagnetic operation type, etc.
The opening and closing may be performed.

According to this configuration, when the cylinder 17 is contracted, the bottom cover 16 is closed as shown by the solid line in FIG. 1, and when the cylinder 17 is extended,
The bottom cover 16 can be opened as shown by the two-dot chain line.

The operation of the cylinder 17 and the drive motor 9 can be controlled by, for example, operating a control valve mounted on the work equipment using a portable switch such as a pendant switch, and the worker approaches the bucket 12. The bottom cover 16 can be opened and closed without any trouble.

In all of the above embodiments, the drive motor 9
Although the cylinder 17 for opening and closing the bottom cover is hydraulic, it may also be electric or pneumatic. If it is electric, a slip ring is used instead of a rotating joint. In addition, the structure of the bucket 12 is not limited to the embodiment, and various structures can be adopted, and it is also possible to adopt a configuration in which soil is taken in from a part other than the bottom cover, and it is also possible to install a plurality of drive motors 9. Yes, there is also a drive motor 9
It is also possible to attach it concentrically with the rotary cylinder body 7.

(Effects of the Invention) As described above, in the present invention, the bottom cover is opened and closed by a cylinder, so opening and closing the bottom cover does not require any effort or human power, so the danger is reduced. . In addition, the cylinder contracts during excavation work and expands when the bottom cover is opened, so that dirt does not adhere to the rod.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of an automatic displacement earth drill according to the present invention, FIG. 2 is an enlarged cross-sectional view showing a rotating joint portion in the embodiment, and FIG. 3 is a hydraulic circuit diagram of the embodiment. It is.

Claims (1)

[Scope of Claims] 1. A drive motor for an earth drill bucket is mounted on an attachment attached to a movable support, and a rotary body rotated by the drive motor is provided on the attachment to protrude downward, and the rotary body An earth drill bucket having an openable and closable bottom lid is attached to the lower part of the earth drill bucket, a cylinder for opening and closing the bottom cover is installed in the earth drill bucket, and a rotation connection means for the working medium of the cylinder is provided on the rotating body. This is an automatic ground drill with the following features: 2. The automatic evacuation type earth drill according to claim 1, wherein the cylinder is attached to the pivot portion side of the bottom cover.