JPH0137907Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a fluid pressure actuator for driving a working member at the lower end of a rod-shaped hanging operating tool, and a connecting portion for a fluid pressure supply hose at the upper end of the operating tool. Regarding earth tools.

These earth tools are mainly used for excavating narrow grooves and holes in the ground, and the length of the rod-shaped hanging operating tool is sufficient so that deep grooves and holes can be excavated well. It is desirable to make the rod-like hanging operating tool longer, but on the other hand, if the rod-shaped hanging operating tool is made long, the long hanging operating tool will get in the way and become difficult to handle when excavating shallow trenches or holes. This is inconvenient, and the long hanging operating tool increases the overall weight, resulting in unnecessary labor for the operator.

Therefore, it is possible to change the length of the working member part below the fluid pressure actuator or the length of the rod-shaped suspension operating tool above the fluid pressure actuator by replacing it with a shorter one and a longer one. This is possible, but in the former case where the length of the lower working member part is changed, the height from the working ground point of the fluid pressure actuator, which is the source of vibration, becomes extremely high when it is lengthened. If the length is changed by replacing the upper rod-like suspension operating tool like the latter, the fluid pressure supply hose must be reconnected each time it is replaced. However, in this respect, there were inconveniences such as requiring a great deal of effort and inconveniences that resulted in leakage of fluid.

The present invention was developed in view of the above circumstances, and its purpose is to avoid inconveniences such as unbalanced tools, complicated labor, and fluid leakage through simple modification. The object of the present invention is to provide an earth tool that can effectively excavate trenches and holes of different depths.

The characteristic configuration of the present invention for achieving the above object is that a fluid pressure actuator for driving a working member is connected to the lower end of the rod-shaped hanging operating tool, and a fluid pressure supply hose is connected to the upper end of the operating tool. In the earthen tool, a connecting portion of the connecting leg rod is formed on a surface of the hose connection portion opposite to the side connected to the operating tool, and further, a connecting portion of the connecting leg rod is formed on a side of the hose connecting portion that is opposite to a side connected to the operating tool, and further, a connecting portion of the connecting leg rod is connected to each of the operating tool and the connecting leg rod. The mounting portions of the handle are fitted onto the outside so as to be able to freely slide vertically relative to each other, and each of these mounting portions is connected to the operation via vibration isolating springs that are supported with clamping pressure from both sides in the relative sliding direction. The structure is attached to the tool and the connecting leg rod, and the following functions and effects are obtained from this configuration.

(i) In other words, instead of changing the length between the fluid pressure actuator and the point of contact with the work member, the length between the fluid pressure actuator and the handle is changed. ,
This prevents the hydraulic actuator, which is a source of vibration, from becoming too high above the ground and becoming difficult to handle.

(ii) Instead of preparing multiple rod-like suspension operating tools of different lengths and selecting and replacing them with the one appropriate for the required length, it is recommended to use rod-like suspension operating tools of a constant length. The length can be changed by attaching and detaching the foot rod while connecting it to the fluid pressure actuator and the hose connector to the operating tool, making it possible to use operating tools with different lengths. Compared to the case where the hose is replaced by itself, the trouble of reconnecting the fluid pressure supply hose can be saved, the work can be simplified, and it is easier to avoid the inconvenience of fluid leaking when reconnecting the hose.

(iii) Since the rod-like suspension operating tool and the joint rod are each provided with a handle attachment point, the handle attachment point can be freely selected depending on the depth of the work area, and the joint foot rod The length of the entire earthen tool can also be adjusted by attaching and detaching. Furthermore, each attachment part of the handle is supported with clamping pressure from both sides in the sliding direction via vibration isolating springs, which is effective in alleviating vibration impact and damping vibration.

From the effects of (i) to (iii) above, when adjusting the length of earth tools, it is possible to perform work at different depths while avoiding inconveniences such as troublesome labor, poor tool balance, or fluid leakage. It is possible to obtain an earthen tool with an easy-to-handle length that corresponds to each type of ground, and it is also possible to provide good cushioning and vibration damping for the handle, resulting in an easy-to-use earthen tool.

Embodiments of the present invention will be described below based on the drawings.

As shown in FIGS. 1 to 3, a vibration-driven fluid pressure cylinder 2 that automatically repeats expansion and contraction by supplying fluid pressure is connected to the lower end side of the rod-shaped hanging operation tool 1 with bolts. A scoop 3 is attached to the piston rod 2a that reciprocates, and a backhoe work vehicle A is attached to the upper end side of the rod-shaped suspension operating tool 1.
The connection parts 5 of the pair of hoses 4, 4 connected to the service ports Sa, Sb, and Sc of
Install the operation switch 6 for Vb, and
A pair of left and right horizontal shaft-like handles 7, 7 are replaceably provided on the rod-like hanging operating tool 1 and the removable joint rod 31, and are mainly used to excavate narrow grooves or holes in the ground. This is a vibrating earth tool B used for this purpose.

In short, when excavating trenches, etc. for burying telephone lines, etc., backhoe work vehicle A cannot be used in places where there are various buried objects such as gas pipes, water pipes, cables, etc., in order to avoid damage to the buried objects. However, the construction is such that such a location can be excavated safely and efficiently with the vibrating earth tool B.

To explain in detail the hydraulic cylinder 2 for vibration drive, as shown in FIG. 5 and FIGS. , are arranged vertically, and a pump side port is installed in the case 9 that houses the spool 8 and the cylinder piston 2A.
The first flow path R ₁ communicates with P ₁ , the second flow path R ₂ communicates with tank side port T ₁ , and the first and second flow paths R 1 _{and R 2 alternate} as the spool 8 slides. A third flow path R ₃ that communicates with the cylinder piston 2A, and a fourth flow path R ₄ that alternately communicates with the second and third flow paths R ₂ and R ₃ as the cylinder piston 2A slides.
It is formed along the sliding direction. and,
As shown in FIG. 4A, in a state in which both the cylinder piston 2A and the spool 8 have moved upward, the third flow path _R3 is connected to the first flow path _R1 via the first relay chamber _U1 . The fluid from the third flow path _R3 is supplied to the upper end of the cylinder piston 2A, and the cylinder piston 2A is moved downward. When the cylinder piston 2A moves downward, as shown in _{FIG .}
Fluid from the fourth flow path _R4 is supplied to the upper end of the spool 8, causing the spool 8 to move downward. When the spool 8 moves downward, as shown in FIG. ₅ and _{FIG .} It communicates with the second flow path _R2 via the relay chamber _U2 , and the cylinder piston 2A
The fluid in the chamber located on the upper side of the cylinder can be discharged through the second flow path _R2 , and the fluid from the first flow path _R1 is supplied to the lower end of the cylinder piston 2A to move the cylinder piston 2A. Move up. However, the fluid from the first flow path _R1 is always supplied to the lower end of the cylinder piston 2A, which provides resistance to the downward movement of the cylinder piston 2A. It is formed to be larger than the pressure receiving area on the lower end side of the piston so that the cylinder piston 2A can move downward in a predetermined manner. Said cylinder piston 2
With the upward movement of A, the fourth flow path _R4 passes through the outer periphery of the small diameter portion Q of the cylinder piston 2A to the second flow path.
R ₂ , and then, as the cylinder piston 2A continues to move upward, the spool 8 is pushed toward the upward side by the cylinder piston 2A. Eventually, by repeating the above operation, the fluid pressure cylinder 2
is configured to automatically expand and contract repeatedly. However, each of the pump side port P ₁ and tank side port T ₁ is as shown in FIG.
A pair of pipes 1 installed inside the rod-shaped operating tool 1
It is connected to the hose connection part 5 by 0 and 10.

The service port electromagnetic valves Va, Vb and the corresponding operation switch 6 will be described in detail.

That is, to configure the backhoe work vehicle A, as shown in FIGS. 1 and 2, a pair of left and right traveling crawlers 12, 12 are respectively driven by two fluid pressure motors 11, 11. A swivel base 13 is attached to the traveling vehicle body equipped with the swivel base 13 so as to be fully swivelable by a hydraulic motor 14, and a boom 18 and an arm that can be swung freely by hydraulic cylinders 15, 16, 17 are attached to the swivel base 13. A backhoe device consisting of a bucket 19 and a bucket 20 is attached, and an earth removal plate 22 is swingable by a fluid pressure cylinder 21.
is attached to the traveling vehicle body.

The various fluid pressure actuators 11...
A pair of fluid pressure pumps 23, 23 for driving the
and the solenoid valves Va, Vb for the service ports are set in a state where the fluid from the pumps 23, 23 flows to the service ports Sa, Sb, Sc, and the control valves V of the various fluid pressure actuators 11... It is provided so that it can be switched to the supply state. However, one of both solenoid valves Va and Vb
In Va, flow path r ₁ for fluid supply and fluid return,
r ₂ is connected, and only the flow path r ₁ for fluid supply is connected to the other valve Vb. In other words, of the three service ports Sa, Sb, and Sc, two are for fluid extraction, and , the remaining one is for pressure oil return, and the fluid from the pair of fluid extraction ports Sa and Sb is joined to the coupler 24 attached to the ends of the pair of hoses 4, 4, and the fluid is returned to the hose 4. A flow path _r3 for supplying the water is provided. Incidentally, when a large amount of fluid is not required, the coupler 24 is connected to a flow path r that short-circuits one of the pair of fluid take-out ports Sa and Sb to the fluid return port Sc, as shown in FIG. It is recommended to replace it with coupler 24A equipped with ₄ .

Further, both the electromagnetic valves Va, Vb are returned to the state where they are supplied to the control valve V for the various fluid pressure actuators 11, and both the electromagnetic valves Va, Vb are switched to the state where they are supplied to the service port Sa... A relay switch 25 is provided for energizing operation, and the operation switch S is
The electric wire 2 is configured to be a so-called self-holding type that is reversely switched between an on state and an off state each time a pressing operation is performed, and the electric wire 2 extends from the switch 6.
6 is removably connected to the terminal connected to the relay switch 25, and when the switch 6 is turned on and operated, the vibration driving fluid pressure cylinder 2 is operated, and the various types of equipment installed on the backhoe work vehicle A are activated. The fluid pressure actuator 11... becomes inoperable, and
When the switch 6 is turned off, the vibration driving fluid pressure cylinder 2 stops and the backhoe work vehicle A
The various fluid pressure actuators 11 equipped in the apparatus are configured to be operable. However, 27 in the diagram
is a key-operated main switch.

The connecting rod 31 is attached when excavating a deep groove or hole, and its mounting structure includes forming a bolt connection hole 32 in the hose connection portion 5 as a connecting portion of the connecting rod 31. The connecting leg rod 31 is detachably connected with bolts.

Next, the mounting structure of the horizontal shaft-shaped handle 7 will be explained.

First, the attachment structure to the rod-shaped hanging operation tool 1 will be explained. As shown in FIGS. 2 and 6, the cylindrical boss 7A of the handle 7 is attached to the handle 7 in a detachable manner and in a vertical position changeable manner. A cylindrical body 29 serving as a mounting portion is fitted onto the rod-shaped hanging operation tool 1 so as to be vertically movable, and a pair of upper and lower vibration-proofing springs 28, 28 which support the handle boss 7A with clamping pressure are provided.
It is provided between the cylindrical body 29, the hose connection part 5, and the fluid pressure cylinder 2 so as to be fitted onto the operating tool 1, respectively, thereby reducing the vibration of the handle 7 caused by the vertical vibration of the scoop 3. , is configured to minimize discomfort to the operator who supports the handle 7.

Next, to explain the attachment structure to the connecting leg rod 31, as shown in FIGS. A cylindrical body 30 having the same structure as 29 and serving as a handle attachment part.
We have prepared the following.

Next, the mounting structure of the scoop 3 will be explained.

As shown in FIGS. 2 and 8, a chuck 33 into which the handle 3A of the scoop 3 is fitted is provided so as to be switchable between a support action state and a support release state by the screw movement of a rotary operating member 33A. A threaded portion 34 into which the chuck 33 is screwed is formed at the lower end of the piston rod 2a. When the chuck 33 is removed, a disk-shaped soil compactor 35 can be screwed onto the threaded portion 34, as shown in FIG.

To implement the present invention, instead of the scoop 3 and soil compaction tool 35, a vibration-driven device such as a tapered earth breaking tool, or a device that is simply driven reciprocatingly such as an earth removal plate may be installed. , these are collectively referred to as working members.

In addition to the fluid pressure cylinder 2, a fluid pressure motor or the like can be used as the fluid pressure actuator for driving the work member 3.
In addition to using the fluid from the backhoe work vehicle A, the specific configuration can be changed in various ways, such as by providing a dedicated pump.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of drawings]

Figure 1 is a side view showing the state of excavation work, Figure 2 is a front view of the earth tool, Figure 3 is a circuit diagram, Figure 4 A,
B and C are cross-sectional views of the fluid pressure cylinder, and Figure 5 is the 4th section.
Fig. 6 is a partially cutaway front view of the hanging operating tool portion, Fig. 7 is a view taken from the - line in Fig. 6, and Fig. 8 is a cross section showing the scoop attachment part. 9 are sectional views showing the mounting portion of the soil compaction tool. DESCRIPTION OF SYMBOLS 1... Rod-shaped suspension operation tool, 2... Fluid pressure actuator, 3... Working member, 4... Fluid pressure supply hose, 5... Hose connection part, 7... Handle, 28...
...Vibration isolation spring, 29, 30...Mounting part, 3
1... Connecting leg rod, 32... Connecting part.

Claims (1)

[Scope of utility model registration request] The earthen tool is provided with a hydraulic actuator 2 for driving a working member 3 on the lower end side of a rod-shaped hanging operating tool 1, and a connection part 5 for a fluid pressure supply hose 4 on the upper end side of the operating tool 1. , a joint rod 3 is attached to the surface of the hose connection portion 5 opposite to the side connected to the operating tool 1.
1 connection part 32 is formed, and further, the operating tool 1
The mounting portion 2 of the handle 7 is attached to each of the and the connecting leg rod 31.
9 and 30 are fitted onto the outside so that they can freely slide vertically relative to each other, and their respective mounting portions 29 and 30 are connected to the mounting portions 29 and 30 via vibration isolating springs 28 that are supported with clamping pressure from both sides in the relative sliding direction. An earthen tool characterized by being attached to an operating tool 1 and a connecting leg rod 31.