JP2002285579A - Maneuvering apparatus for rotating work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce material cost and manufacturing cost for the maneuvering apparatus of a rotating work machine by building a control valve unit in the maneuvering apparatus without making piping work more difficult for a manifold. SOLUTION: A control valve unit 29 is arranged in a lower space of a manihold 34 in a maneuvering box 26 in a state where an inlet 39 of each of control valves V1 to V4 is directed upward and the inlet 39 of each of the control valves V1 to V4 of the control valve unit 29 is arranged to the same plan position of a plurality of discharge openings of the manifold 34 formed downward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering device for a turning machine such as a backhoe.

[0002]

2. Description of the Related Art In a backhoe, for example, there are a standard machine and a small rear swing machine equipped with a drilling device at the front end of a swivel platform, and an ultra-small swing machine equipped with a drilling device at the center of the swivel platform. In each model, the control box of the control device is arranged in front of the driver's seat on the turntable. The steering device of such a turning work machine usually includes a left and right traveling motor,
A control valve unit that concentrates a large number of control valves that control hydraulic oil to hydraulic actuators such as traveling speed change, swing motor, dozer cylinder, boom cylinder, arm cylinder, bucket cylinder, swing cylinder, etc. And a plurality of operating members for operation, and among these operating members, operating members that are used less frequently, such as for left and right running, for dozers, and for swing, are mechanically connected via links and rods. It is linked to an operation type control valve.

On the other hand, operating members requiring frequent and delicate operations, such as turning, boom, arm, and bucket, are composed of a pair of left and right control levers projecting from the upper part of the control box. The operation lever is swingably connected to a pilot valve unit housed in a control box, and an output port of the pilot valve unit is connected to an inlet of a pilot-operated control valve through a manifold and hydraulic piping. Are in communication. Therefore, the flow of the pilot pressure oil from the pilot valve unit is adjusted by swinging the pair of left and right control levers back and forth or left and right, thereby switching the pilot-operated control valve, thereby enabling the left and right turning operation of the swivel base. The arm can be moved back and forth, etc.
-132972, JP-A-10-245873).

[0004]

In a turning work machine such as a backhoe of this type, a control valve unit including a pilot-operated control valve for turning, a boom, an arm and a bucket is usually provided with a control valve unit for the turning table. Since it is located inside, it is necessary to connect a long hydraulic hose between each control valve in the swivel table and the manifold in the control box, which increases the material cost and manufacturing cost of the control device. was there. On the other hand, as means for solving such inconvenience, it is conceivable to arrange the control valve unit inside the control box to reduce the piping distance to the manifold. However, as the piping distance becomes smaller, it becomes more difficult to bend the hydraulic hose for piping this time, so that there is a problem that the labor required for manufacturing the steering device increases.

The present invention has been made in view of the above circumstances, and enables a control valve unit to be incorporated in a control device without making piping work for a manifold difficult, thereby reducing the material cost and the manufacturing cost of the control device of a turning work machine. The purpose is to do.

[0006]

In order to achieve the above object,
The present invention has taken the following technical measures. That is, a first aspect of the present invention to achieve the above object is the steering device for a turning work machine described above, wherein the control valve unit has the manifold in the control box with the inlets of the respective control valves facing upward. The control valve unit of the present invention is characterized in that the inlets of the control valves of the control valve unit are arranged at the same plane position as the plurality of discharge ports of the manifold.

In this case, the inflow ports of the pilot-operated control valves facing upward are in the same plane position as the plurality of discharge ports of the manifold facing downward. When connecting, there is no need to bend the hydraulic hose or use a bent tube, and the piping work for the manifold is greatly simplified. For this reason, the control valve unit can be easily incorporated into the control box, and it is not necessary to connect a long hydraulic hose to the manifold, so that the material cost and the manufacturing cost of the control device can be reduced.

In the first aspect of the present invention, not only a flexible hydraulic hose made of rubber or the like but also a hydraulic pipe connecting the manifold and each pilot-operated control valve may be used.
A straight non-flexible tube made of metal or the like can be employed. And when using this straight non-flexible tube,
When the inflexible tube is not bent or inclined or curved when the inflow port of the control valve or the discharge port of the manifold is forcibly inserted into the connection ports at both ends thereof, when the hydraulic hose is used, Piping work for the manifold is easier than that.

In the first aspect of the present invention, if the unload valve for raising or releasing the pilot pressure of the pilot valve unit is directly connected to the manifold, the work of piping the unload valve to the manifold can be performed. Since it becomes unnecessary, the material cost and the manufacturing cost of the control device can be further reduced. According to a second aspect of the present invention, there is provided a steering device for a turning work machine, wherein the control valve unit is disposed in a space below the manifold in the control box. And the plurality of discharge ports of the manifold are connected via a plurality of hydraulic pipes formed of non-flexible pipes.

In this case, since the inflow port of the control valve and the discharge port of the manifold are connected by a non-flexible pipe, there is no need to bend the hydraulic hose when connecting them with a hydraulic pipe. Piping work becomes very simple. For this reason, the control valve unit can be easily incorporated into the control device, and there is no need to connect a long hydraulic hose to the manifold, so that the material cost and the manufacturing cost of the control device can be reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 4, a small rear turning type backhoe 1 exemplified as a turning work machine is mounted on a crawler traveling device 2, a turning table 3 provided on the traveling device 2 so as to be freely rotatable, and the turning table 3. It mainly comprises an excavator 4. The crawler traveling device 2 includes a track frame 5 and side frames 6 provided on both left and right sides thereof. Each side frame 6 has a driving wheel and a driven wheel disposed at the front and rear portions thereof, and a plurality of rolling wheels disposed at an intermediate portion thereof, and is wound so as to pass from the driving wheel to the driven wheel. A rubber or iron crawler 7 is driven by a hydraulically driven traveling motor 8.

At the center of the upper surface of the track frame 5, the swivel 3 is mounted via a swivel bearing. It is pivotable around the center.
A dozer 10 is pivotally attached to the front end of the track frame 5, and the dozer 10 can be moved up and down by a dozer cylinder 11. The swivel base 3 is formed by welding a mounting frame or bracket for mounting various devices to a base plate 12 to which a swivel bearing is mounted. Inside the swivel base 3, an engine, a fuel tank, an oil tank, and the like are provided. It is installed. A rear portion of the swivel 3 is covered with a bonnet 13, and a driver's seat 14 is provided on the bonnet 13. The floor portion of the swivel base 3 in front of the driver's seat 14 is a step-in / out step, and the excavator 4 is mounted on a support bracket fixed to the front end of the base plate 12 so as to be swingable about a vertical axis.

The excavator 4 includes a swing bracket 15 supported on a support bracket via a vertical axis, a boom 16 pivotally attached to the swing bracket 15 so as to be vertically swingable, and a tip end of the boom 16. An arm 17 pivotally attached to the arm 17 and a bucket 18 pivotally attached to the distal end of the arm 17 are provided. A swing bracket 15 is provided at a front portion in the swivel 3. The swing cylinder 19 can swing right and left.
Further, the boom 16 is swung by a boom cylinder 20 erected between the swing bracket 15 and the center of the boom 16, and the arm 17 is provided between the intermediate bracket projecting from the upper surface of the center of the boom 16 and the arm 17. The bucket 18 is swung by an arm cylinder 21 erected between base brackets formed at the base end, and
7 is pivoted by a bucket cylinder 22 provided between the base end bracket and the bucket link.

Each cylinder 1
A control device 25 for controlling hydraulic actuators such as 1, 19 to 22 and the like to control the crawler traveling device 1, the swivel 3 and the excavator 4 as desired is provided. 3, a control box 26 disposed in front of the floor, a pair of left and right control levers 27 housed in the control box 26 and protruding outside from the upper surface of the control box 26, and provided between the control levers 27. And a pair of left and right traveling levers 28.

As shown in FIGS. 1 and 2, the steering device 25 also includes a number of hydraulic pressure control units for controlling hydraulic oil to hydraulic actuators such as the cylinders 19 to 22 for driving the swing motor 9 and the excavator 4. A control valve unit 29 in which the control valves V are concentrated is provided. Among the control members for remotely controlling the control valves V, a traveling lever 28 for left and right traveling and a pedal 30 for a dozer (see FIG. 1)
An operation member whose use frequency is relatively low, such as link 3
1 and a mechanically operated control valve Vm via the rod 32
It is linked and linked.

On the other hand, hydraulic actuators requiring frequent and delicate operations such as turning, boom, arm and bucket are controlled by a pair of left and right control levers 27 via a pilot valve unit 33 through a pilot-operated control valve V1. To V4. That is, as shown in FIG. 3, pilot valves are used for the control valves V1 to V4 for controlling the swing motor 9, the boom cylinder 20, the arm cylinder 21, and the bucket cylinder 22. The hydraulic circuit is configured to be switched by pilot pressure oil from a pilot valve unit 33 operated by the lever 27.

Of the pair of left and right control levers 27, the left control lever 27L is pivotally operated in the front-rear direction and the left-right direction so that the left pilot valve unit 33 can swing freely.
The casing is supported by an L casing. When the pilot valves P1 to P4 in the casing are switched, the control valve V1 for turning and the control valve V2 for the arm can be controlled. Also, the right operation lever 27R
Is supported by the casing of the right pilot valve unit 33R so as to be swingable in the front-rear direction and the left-right direction, and by switching the pilot valves P5 to P8 in the casing, the boom for the boom is operated. The control valve V3 and the packet control valve V4 can be controlled.

As shown in FIGS. 1 and 2, inside the control box 26, there are provided pilot valve units 33 each having a base end of the control lever 26 connected to be able to swing back and forth and right and left. , The manifold 3 connected to the output port of the pilot valve unit 33
4, the control valve unit 29 in which a mechanical control valve Vm and a pilot-operated control valve V1 to V4 are continuously joined in the left-right direction, and the pilot-operated control valves V1 to V4 and a manifold. 34
And a plurality of hydraulic pipes 40 for piping between them.

Among them, the manifold 34 is provided with the swivel 3
A first support plate 36 fixed to a support frame 35 provided upright and having an oil passage therein; a manual switching valve 37 fixed to the lower surface of the support plate 36;
A second support plate 38 fixed to the lower surface of the switching valve 37 and having an oil passage therein is provided. Each pilot valve unit 33 is fixed to the upper surface of both left and right ends of the first support plate 36. The control valve unit 29 is disposed in the space below the manifold 34 in the control box 26 such that the spools of the control valves V1 to V4 are oriented in the vertical direction and the inlets 39 are directed upward.

At the right end of the first support plate 36, a discharge port of an oil passage communicating with the right pilot valve unit 33R is formed downward, and a control valve V3 for the boom and a control valve V4 for the bucket are formed. Are arranged at the same plane position as the respective discharge ports. On the other hand, the left pilot valve unit 33L is connected to the left end of the second support plate 38 via the switching valve 37.
The discharge port of the oil path communicating with the arm is formed downward, and the inflow ports 39 of the control valve V1 for turning and the control valve V2 for the arm are arranged at the same plane position as the respective discharge ports.

The hydraulic pipe 40 of the present embodiment is made of a straight non-flexible pipe made of metal or hard resin. The hydraulic pipe 40 made of the non-flexible pipe is used to control the pilot-operated control valves V1 to V4. An inflow port 39 is connected to each discharge port on the manifold 34 side. As described above, according to the control device 25 of the present embodiment, the inflow ports 39 of the pilot-operated control valves V1 to V4 pointing upward are in the same plane position as the discharge ports on the manifold 34 side pointing downward. Therefore, there is no need to bend the hydraulic hose or use a bent pipe when connecting them with the hydraulic pipe 40, and the piping work for the manifold 34 is very simple in this regard.

Therefore, the control valve unit 2
9 can be easily incorporated into the control box 26, and there is no need to connect a long hydraulic hose to the manifold 34, so that the material cost and the manufacturing cost of the control device 25 can be reduced. Further, in the present embodiment, since a straight non-flexible pipe is used as the hydraulic pipe 40, the control valves V1 to V1 are connected to the connection ports at both ends thereof.
When forcibly inserting the inflow port 39 of the V4 or the discharge port of the manifold 34, the non-flexible pipe does not bend or curve due to bending, and piping for the manifold 34 is compared with the case where a hydraulic hose is used. There is also the advantage that work is easier.

In the present embodiment, the switching valve 37 for switching the oil passage is interposed between the control valves V1 and V2 for turning and the arm and the first support plate 36. The direction of turning and the operation of the arm can be switched. Of course, the switching valve 37 may be omitted and control valves V1 and V2 for turning and arm may be directly piped to the first support plate 36, or control valves V3 and V for boom and bucket may be provided.
Also, the switching valve 37 may be interposed with respect to 4.

In the steering device 25, the driver operates the driver's seat 1.
The operation by the control lever 27 is permitted when the driver is seated on the driver's seat 4, and the operation is disabled when the driver gets off the driver's seat 14 to prevent the excavator 4 or the like from being operated by mistake. A safety device 42 is incorporated.
That is, as shown in the hydraulic circuit of FIG. 4, the unload valve 43 which can be switched between two positions, a pressure oil supply state and a supply stop state, is provided in the pressure oil supply path for the pilot valves P1 to P8 of each pilot valve unit 33. The unload valve 43 is directly connected to the lower surface of the first support plate 36 of the manifold 34 that supports the pilot valve unit 33 in the control box 26, as shown in FIGS. ing.

A switching lever 44 for switching the unload valve 43 is pivotably mounted on the side surface of the control box 26. The switching lever 44 moves the center of the control box 26 in the left-right direction. Are formed in a substantially U-shaped frame shape by a rotating rod 45 penetrating through the shaft and an operating rod 46 fixed orthogonally to both ends of the rotating rod 45. An intermediate portion of the rotating rod 45 is directly connected to a rotary shaft 47 for switching an oil path of an unload valve 43 incorporated in the control box 26,
The protruding end of the rotating rod 45 extends to a position protruding into a boarding passage below the driver's seat 14.

When the switching lever 44 is rotated so that the operating rod 46 extends horizontally, the unload valve 43 is switched to the supply stop state, and the operation of the control lever 27 is disabled. When the switching lever 44 is rotated so as to be substantially vertical,
The unload valve 43 is switched to the pressure oil supply state, and the operation of the excavator 4 and the like by the control lever 27 is allowed. According to the safety device 42 of the present embodiment, since the rotating rod 45 of the switching lever 44 is directly connected to the rotary shaft 47 for switching the oil path of the unload valve 43 incorporated in the control box 26, the switching is performed. The interlocking mechanism between the lever 44 and the unload valve 43 becomes extremely simple, and the material cost and the manufacturing cost of the safety device 42 can be significantly reduced.

The unloading valve 43 is connected to a first support plate 36 constituting a manifold 34 for supporting the pilot valve unit 33 in the control box 26.
Since it is directly connected to the lower surface of the control box, a hydraulic pipe between the unload valve 43 and the manifold 34 is not required, and a special bracket for fixing the unload valve 43 in the control box 26 is not required. This also contributes to a reduction in material costs and manufacturing costs of the control device 25 or the safety device 42. The present invention can be applied not only to the small back turning type backhoe 1 but also to a standard type or a micro turning type backhoe.

[0028]

As described above, according to the present invention,
Since the control valve unit can be incorporated in the control device without making the piping work for the manifold difficult, the material cost and the manufacturing cost of the control device of the turning work machine can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a steering device and a safety device of a backhoe as viewed from a driver seat side.

FIG. 2 is a left side view of the steering device and the safety device.

FIG. 3 is a hydraulic circuit diagram of a drive system of the backhoe.

FIG. 4 is a left side view of the backhoe.

[Explanation of symbols]

 3 Turning Table 25 Pilot Device 26 Pilot Box 27 Pilot Lever 29 Control Valve Unit 33 Pilot Valve Unit 34 Manifold 39 Inlet 40 Hydraulic Piping 43 Unload Valve V1 Swivel Control Valve V2 Arm Control Valve V3 Boom Control Valve V4 Bucket control valve

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D015 BA01 EB00 3F205 AA07 BA06 KA10 3H089 AA60 BB27 CC01 CC08 CC11 DA02 DA06 DA13 DB03 DB49 DB86 EE17 GG02 JJ01

Claims (4)

[Claims] A control box (26) arranged on a swivel (3) and a control lever (27) housed in the control box (26) and protruding outside the control box (26). A pilot valve unit (33) swingably connected; a manifold (34) housed in the steering box (26) and connected to an output port of the pilot valve unit (33);
A plurality of pilot-operated control valves (V
1 to V4).
9) and a plurality of hydraulic pipes (40) for connecting the pilot pressure oil inlet (39) of each control valve (V1 to V4) to the manifold (34). The control valve unit (29) is provided with the manifold (34) in the control box (26) with the inlets (39) of the control valves (V1 to V4) facing upward. The control valves (V1 to V1) of the control valve unit (29) are arranged in the lower space.
4) The steering device for a turning work machine, wherein the inflow port (39) is arranged at the same plane position as the plurality of discharge ports of the manifold (34) formed downward. 2. The control device according to claim 1, wherein the hydraulic pipe (40) is a straight non-flexible pipe. 3. An apparatus according to claim 1, wherein an unload valve (43) for raising or releasing the pilot pressure of the pilot valve unit (33) is directly connected to the manifold (34). The operating device of a turning work machine according to any one of the preceding claims. 4. A control box (26) arranged on a swivel (3) and a control lever (27) housed in the control box (26) and protruding outside the control box (26). A pilot valve unit (33) swingably connected; a manifold (34) housed in the steering box (26) and connected to an output port of the pilot valve unit (33);
A plurality of pilot operated control valves (V) operated by the pilot pressure of the pilot valve unit (33).
1 to V4).
9) and a plurality of hydraulic pipes (40) for connecting the pilot pressure oil inlet (39) of each control valve (V1 to V4) to the manifold (34). In the control device of the machine, the control valve unit (29) is disposed in the control box (26) in a space below the manifold (34), and the control valves (V1 to V4) of the control valve unit (29) are arranged. And a plurality of discharge ports of the manifold (34) are connected to each other through the plurality of hydraulic pipes (40) formed of a non-flexible pipe. .