JPS5838054Y2 - Work equipment control valve operation structure - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a working arm that can be driven up and down, and can be bent and extended, by providing a module that is interlocked and connected to the work arm so as to operate in proportion to the reduction in proportion to changes in its position and posture. The present invention relates to a working machine in which the sliding spool operating valve of the working arm is operable by pilot pressure associated with operation, and the operating valve is provided with a mechanically linked lever for manually operating each of the operating valves.

Conventionally, as shown in FIG. 6, in this type of device, a manually operated lever 25 and an operating valve V are interlocked and connected via a double rod type cylinder 31, and both pressurizing chambers are formed in the cylinder 31. Pilot pressure is applied to R and R, and the operating valve V is configured to be automatically operated in accordance with the mobile operation.

However, it is necessary to provide seal members 33 and 33 at the locations where the cylinder rod 32 penetrates the cylinder rod 32 of both chambers R and R, respectively.As a result, resistance is applied from the seal members 33 and 33 to the displacement of the rod 32, and the model At the beginning of operation, the operation valve V cannot be operated until the maximum static friction force between the pilot pressure seal member 33 and the rod 32 is exceeded, and the work arm A is not operated even though model B is being operated. , there is a problem that it is difficult to perform minute operations,
Also, if the pilot pressure exceeds the maximum static friction force,
On the other hand, work arm A is operated rapidly and its dynamic inertia is large.
Regardless of whether model B has stopped, work arm A has gone too far without stopping at a predetermined position, resulting in a problem in which bunching occurs in the operation of arm A.

The technical problem to be solved by the present invention is to effectively utilize the structure of a spool valve used as a control valve, to easily configure a structure for operating the control valve, and to reduce the The purpose is to enable good operation and stopping at a predetermined position.

The technical means of this invention taken to solve the above problems are as follows:
In a work machine equipped with an operating valve for operating the aforementioned working arm and a lever for manually operating the operating valve, for a control valve that can freely switch the direction of pressure oil supply to the working arm. , a valve operating section for controlling the operation of the spool of the control valve is attached, and the valve operating section is attached to both ends of the spool protruding side of the roll valve to the control 1 by a separate member from the control I/roll valve. It is composed of an integrated cover that is attached to the surface, and this integrated cover has a space formed therein for allowing the operation of the spool, and a port for supplying pilot pressure through the integrated cover. , a through hole for inserting an interlocking member connected to the lever through one cover, and a sealing member is installed between the through hole and the interlocking member; The interlocking member and the spool are interlocked and connected to each other in such a manner that a pressure-receiving surface sufficient to operate the spool by the pilot pressure applied in the space is formed at the end face of the spool, and such technical measures are taken. The effects obtained by this are as follows.

■ Since pressure is applied directly to the spool of the control valve, in order to link the spool and the control valve, a cover with an integrated space for applying pilot pressure is required. It is only necessary to form a through hole in one of the holes for inserting the interlocking member, and therefore, it is possible to seal the interlocking member by simply providing a sealing member at that one location. The influence of resistance exerted on the interlocking member by the motile can be reduced, which makes it easier to perform minute operations on the working arm using the motile, and also allows for better stopping at a predetermined position by suppressing bunching.

■Furthermore, in order to obtain such a control valve operating structure, a general commercially available spool valve can be used as is, and a cover of the above structure can be attached to both ends of the spool valve. , since the end face of the spool can be configured to be used as a piston member for operating the spool, for example,
This is an extremely complex and special structure in which the functional part of a normal directional valve and the valve operating function part for operating the directional valve are integrated into one valve box. There is no need to use a valve body, and there is an advantage that the entire control valve operating structure can be provided with a simple structure that is easy to manufacture and processed, and at a low cost.

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

A swivel base 2 is provided on a traveling vehicle body equipped with a crawler traveling device 1 so as to be able to freely rotate around a vertical axis 2, a control cabin 3 is provided on the swivel base 2, and an excavation device 4 is provided in the front part, the traveling device 1, The swivel table 2 and the excavation device 4 are configured to be driven by hydraulic pressure as an example of fluid pressure formation, and therefore,
A working machine is installed to perform ground excavation work.

The excavation equipment 4 has a boom 5 pivotally connected to a rotating table 2, an arm 6 to the boom 5, and a packet 7, which is an example of a worker, pivotally supported to the boom 5. Connect the swivel base 2 and boom 5, boom 5 and arm 6
, and cylinders 8, 9 . . . between the arm 6 and the packet 7, respectively.
10 is interposed therebetween, and the boom 5, arm 6, and packet 7 are driven and moved by the operation of cylinders 8.

In the control cabin 3, there is provided a model B that operates proportionally to the change in position and attitude of the boom 5 and the arm 6, and the cylinders 8, 8 of the boom 5 and the arm 6, respectively, operate in conjunction with the operation of the model B. Control valves (1) and (2) for model B are automatically operated via a pilot pressure mechanism 11, and the boom 5 and arm 6 can be driven by operation for model B.

That is, to configure model B, a first link 5a corresponding to the boom 5 is rotatably connected to the base 12, and a second link 6a corresponding to the arm 6 is connected to the first link 5a. The operating handle 13 is rotatably connected to the second link 6a, and the operating handle 13 is rotatably connected to the second link 6a around an axis corresponding to a rotation wheel center for the arm 6 of the packet 7. 13, an operating tool 14 for the packet 7 is provided.

To explain the state of connection between the arm 6 and the second link 6a, a plate 15 is rotatably and pivotally connected to the second link 6a, and an operating piece extending from the second link 6a is attached to the plate 15. Control valve AI of the pilot pressure mechanism 11 is opposed to the control valve AI with 16 in between.

A2 is provided, and when the model B is operated, the control valve A1゜A is
Control valve for the arm by operating either of 2■
Apply pilot pressure to the pressurized chambers R and R formed attached to the
It is configured to drive the arm 6.

The arm 6 and the plate body 15 are connected to a release wire 17
．． 17, and as the arm 6 is driven, the plate body 15 is rotated, and the control valves A, , A2
is configured so that the arm 6 is automatically closed and the arm 6 is driven in response to the second link 6a.

The boom 5 and the first link 5a are also linked in a similar configuration.

The operating tool 14 for the bucket 1-7 can be operated by finger operation such as a thumb while gripping the handle 13 at the tip of the handle 13, and is oscillated in a biased state to maintain it at a neutral position at all times. The operating tool 14 is pivotally connected for free movement.
Due to the swinging of the control valve B of the pilot pressure mechanism 11,
1. B 2 is operated to apply pilot pressure to the pressurized chambers R and R formed attached to the packet control valve ①, and is configured to drive 7 to the bucket 1,
The configuration is such that the packet 7 can be driven and operated regardless of the rotation of the handle 13 with respect to the second link 6a.

The control valve ■...... each pressurized chamber R
, R, as shown in FIG.
Covers 19 and 20 as valve operating parts V and V8 are provided in series on both sides of the spool 18 in the sliding direction so as to surround both ends of the spool 18, respectively, and the covers 19 and 20 are used for supplying pilot pressure. The port 21 is provided, and the cover 19 is integrated.
．． This spool is attached to one end face F of the spool 18 so that pilot pressure can be applied to the spool by using the spaces formed inside each of the spools 20 as pressurizing chambers R, R. 18 and the interlocking member 24 to the operating lever 25 are connected in such a state that a pressure receiving surface is formed on the spool end face F.

Seat plates 22, 22 are fitted onto one side of the spool 18 so as to be slidable within a predetermined range, and both seat plates 22, 22 are fitted facing each other.
A compression spring 23 is interposed between 22, and the valve ■
The structure is such that it is maintained in a neutral state during normal times.

A manual operation lever 25 is interlocked and connected to the other side of the spool 18 via an interlocking member 24, so that valve (2) can also be operated manually.

Then, the interlocking member 24 is connected to the peripheral wall 26 of the cover integral 19.
A sealing member 28 is provided between the through hole 27 and the interlocking member 24 to prevent the pilot fluid from leaking out from the pressurizing chamber R.

FIG. 5 shows another embodiment in which a sealing member 28 in a peripheral wall 28
A drain space S is formed on the side closer to the valve ■, and the space S and the tank T are connected to each other so that the pilot fluid leaked from the pressurizing chamber R to the space S is returned to the tank T. The structure is such that the pressure of the pilot fluid applied to the member 28 is reduced, and a seal member 28 that provides less resistance to the interlocking member 24 can be used.

The present invention is not limited to a type of work machine in which a boom 5 and an arm 6 are swingably connected, but can also be applied to, for example, a type of work machine in which only a boom 6 is used and a worker is attached to it. consisting of the boom 5 and arm 6, or
The boom 5 alone is collectively referred to as the work arm A.

[Brief explanation of drawings]

The drawings show an embodiment of the control valve operation structure for a work machine according to the present invention, with Fig. 1 being an overall side view, Fig. 2 being a side view showing the state of connection between the excavation equipment and the module, and Fig. 3 showing the pilot pressure. A circuit diagram showing the mechanism, FIG. 4 is a vertical cross-sectional view showing the control valve and the valve operation part, FIG. 5 is a vertical cross-sectional view of the main part of another embodiment, and FIG. 6 is a partially cutaway side view showing the conventional example. It is. 18...Spool, 19.20...Cover integrated, 21...Pole l-124...
Interlocking member, 25...Lever, 27...
Through hole, A...Working arm, B...Model, F...End face, ■...Control valve, ■8...Valve Operation unit, R...
・Space section.

Claims (1)

[Scope of utility model registration request] A motile B is connected to the work arm A, which is vertically driven, oscillates, and can be bent and extended, in order to operate in proportion to the change in its position and posture. In the work machine, the sliding spool type control l-roll valve (2) of the arm A is configured to be operable, and the control valve (2) is provided with a mechanically linked lever 25 for manually operating each control valve (2). The control valve (1) which can freely switch the direction of supply of pressure oil to the work arm A side is provided with valve operation parts V, , V for controlling the operation of the spool 18 of the control valve V, and the above-mentioned Valve operation part V
,,V, are constituted by an integral cover 19.20 which is a separate member from the control valve V and is attached to both end faces of the control valve V on the spool protruding side, and this integral cover 19.20 includes a , inside of which the spool 1
A port (21.21) for supplying pilot pressure through the cover 19.20 and a port 21.21 for supplying pilot pressure through the cover 19 and 21. A through hole 27 is formed through which the continuous interlocking member 24 is inserted, and a sealing member 28 is installed between the through hole 27 and the interlocking member 24, and further,
The interlocking member 24 and the spool 18 are connected to the spool 1
A control valve for a working machine, characterized in that the control valve is interlocked with one end face of the spool 8 so as to form a pressure-receiving surface sufficient to operate the spool 18 by the pilot pressure applied in the spaces R and R. Operation structure.