JPS5825004Y2 - Fluid pressure driven work equipment - Google Patents

Description

[Detailed description of the invention] The present invention provides a working arm that can be driven up and down, swings and bends, and is mounted on a swivel table so as to be able to swing and move freely around the vertical axis, and is attached to the working arm to change the driving position. The present invention relates to a fluid-pressure-driven working machine which is configured such that a working tool can be freely installed and a single operation lever can drive one type of the arm and the working tool and the swivel base.

This type of work equipment, for example, a work arm in which a boom and an arm are pivotably connected to a base, and
Conventionally, there is a backhoe for ground excavation work in which a packet is pivotally connected to the tip of a working arm as a working tool, and the base is attached to a swivel base so as to be swingable around a vertical axis.
Driving the swivel base and arm using one operating lever, driving the boom and packet using another operating lever, and swinging the working arm relative to the swivel base using another operating lever, that is, Three levers were used to drive the swivel table, working arm, and packet, and to swing the working arm.

However, depending on the work site, there may be buildings etc. in close proximity that prevent the swivel table from rotating, and the excavation work may have to rely solely on the swinging operation of the work arm. Even though the swivel table is not driven, the arm must be swung, so the three operating levers must be frequently changed and operated, reducing not only the operability but also the work efficiency. Ta.

In view of the above points, it is an object of the present invention to improve the operability and work efficiency by allowing the work to be performed using two operation levers even when the work cannot be rotated on the turning table.

In order to achieve the above object, the present invention provides a control valve operated by the lever in the fluid pressure driven working machine described above, in the middle of the pressure fluid supply path to the fluid pressure motor that drives the swivel table. At the same time, on the downstream side of the control valve of the pressure fluid supply path, a state in which pressure fluid is supplied to the fluid pressure motor, and a state in which pressure fluid is supplied to the fluid pressure actuator that drives and swings the working arm around the vertical axis. It is characterized in that it is equipped with a flow path switching valve that switches between the states in which fluid is supplied.

In other words, during normal work, pressure fluid is supplied to the fluid pressure motor for driving the swivel base, but when the swivel base cannot be rotated as mentioned above, the flow path switching valve is switched and the work arm is moved vertically. To supply pressure fluid to a fluid pressure actuator that drives and oscillates around its axis, and performs any one of the following: a vertically driving and oscillating operation of a working arm, a driving bending and stretching operation, and a driving operation of a working tool. The control valve operated by the lever enables the working arm to be driven and swung around the vertical axis in the same manner as the swivel base was originally driven.

Therefore, even when the swivel table cannot be rotated,
For example, a single operating lever can be used to drive the work implement and to drive and swing the work arm up and down, and a single lever can be used to drive the work arm to bend and extend it and to drive it around the vertical axis. The machine can be operated using two operating levers in the same way as when the swivel table is rotated, such as when working with the operating lever of the swivel base, improving operability and work efficiency regardless of the working location conditions. Ta.

Embodiments of the present invention will be described in detail below with reference to the drawings.

A swivel base 2 is attached to a traveling machine base equipped with a crawler traveling device 1 so as to be able to rotate around a vertical axis 2, a control section 3 is disposed on the swivel base 2, and a base 4 can be rotated around a vertical axis 0. A working arm 7, which is formed by pivotally connecting a boom 5 and an arm 6, is pivotally connected to the base 4 so as to be able to freely swing up and down, and a packet 8 is attached to the tip of the working arm E. An example of a fluid pressure actuator that is pivotably connected to be swingable, drives the traveling device 1 and the swivel base 2 by hydraulic pressure as an example of a fluid pressure type, and is interposed between the swivel base 2 and the base 4. It is configured to operate a swing cylinder 9 and a cylinder 10 interposed between the base 4 and the frame 5, the frame 5 and the arm 6, and the arm 6 and the packet 8. It is constructed as a swivel type backhoe for ground excavation work so that it can also be used to dig side ditches.

The control unit 3 includes a steering lever 11.11 for operating the traveling device 1, and two types of drive operations for the swivel base 2 and the arm 6, as well as the boom 5 and the packet 8, with one lever by a cross operation. operating levers 12, 13, and the base 4.
An operating lever 14 and the like for swinging operation around the vertical axis 0 are provided.

The swivel base 2 is configured to be driven and swiveled by a hydraulic motor 15, and as shown in FIG. It is configured to supply pressure oil to the hydraulic motor 15, and a first control valve 19 operated by the operating lever 12 is interposed in the middle.

A circuit for supplying pressure oil to the swing cylinder 9 is formed in parallel with the hydraulic circuit, and a second control valve 20 operated by the operating lever 14 is interposed in the middle of the circuit.

A valve 21 for switching the flow path is provided on the downstream side of both control valves 19 and 20, and by switching the flow path with the second control valve 20 in the neutral state, the first control valve 19, i.e. The swing cylinder 9 is actuated by a control lever 12 for driving the swivel base 2, that is, the swing cylinder 9 can be rotated about the vertical axis zero of the base 4.

In the figure, reference numeral 22 denotes a brake valve for applying a braking action to the turning speed of the turning table 2.

In the above embodiment, as clearly shown in FIG. 2, the swivel base 2 and the base 4 can be simultaneously rotated around the vertical axis 0 by operating both control valves 19 and 20. However, if it is a type that only turns in one direction at all times, the second control valve 20,
Further, a parallel circuit extending from the upstream side of the first control valve 19 to the flow path switching valve 21 in which the valve 20 is interposed can be made unnecessary.

To switch the flow path, not only the above-mentioned type of valve 21 but also valves of various structures such as a rotary type valve can be employed, and these are collectively referred to as the flow path switching valve 21.

The present invention is applicable not only to backhoes in which the packet 8 is installed on the working arm 7, but also to various types of working machines. Collectively referred to as tool 8.

[Brief explanation of drawings]

The drawings illustrate embodiments of the hydraulically driven working machine according to the present invention, with FIG. 1 being an overall side view of a backhoe, and FIG. 2 being a hydraulic circuit diagram for rotating the swivel table and the base. 2... Swivel base, 7... Working arm,
8... Working tool, 12... Operating lever,
19... Control valve, 21...
・Flow path switching valve, Q... Vertical axis center.

Claims (1)

[Scope of utility model registration request] A working arm l which can be driven vertically and oscillated and can be bent and extended is provided on the swivel table 2 so as to be able to be driven and oscillated around the vertical axis 0,
A work tool 8 is attached to the work arm 7 so that its posture and drive can be changed freely.
is provided, and the drive operation for one type of the arm 7 and the work tool 8 and the drive operation for the swivel base 2 are performed in one.
This is a fluid-pressure-driven work machine configured to be operated by a main operating lever 12, and the lever 12
a control valve 19 operated by the pressure fluid supply path;
9, a state in which pressure fluid is supplied to the fluid pressure motor 15, and a state in which pressure fluid is supplied to the fluid pressure actuator 9 that drives and swings the working arm 7 around the vertical axis 0. Fluid pressure driven type with interposed flow path switching valve 21