JP3560146B2 - Hydraulic excavator control valve unit piping structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a piping structure of a control valve unit used for a construction machine or the like.
[0002]
[Prior art]
A construction machine, for example, a hydraulic shovel, includes a lower traveling body that can travel freely, an upper revolving body that is rotatably mounted on the upper part of the lower traveling body, and an attachment that is rotatably connected to the upper revolving body. are doing. The running of the lower running body, the turning of the upper rotating body, the turning of the attachment, and the like are performed by driving the actuator 33, respectively. A control circuit of the actuator will be described with reference to FIG. The driving of the actuator 33 is performed by the action of pressure oil discharged from the hydraulic pump 30. The hydraulic pump 30 sucks oil from the tank 31. A control valve 32 for controlling the supply and discharge of pressurized oil to and from the actuator 33 is provided in the middle of a main pipe 37 (hereinafter, high-pressure pipe) connecting the hydraulic pump 30 and each actuator 33. The switching of the control valve 32 is performed by the action of pilot pressure oil passing through a pilot pipe 36 (hereinafter, low pressure pipe) connecting the remote control valve 35 of the control device 34 and the control valve 32.
[0003]
[Problems to be solved by the invention]
The control valve 32 generally constitutes a control valve unit by combining a plurality of control valves. According to this, there is an advantage that the inlet of the pressure oil from the pump 30 can be integrated into one, and the outlet of the return oil to the tank 31 can be integrated into one.
[0004]
However, as a result of configuring a control valve unit by combining a plurality of control valves as described above, there are the following problems. That is, the control valve is configured such that two high-pressure pipes are connected and two low-pressure pipes are connected to the control valve (in some cases, an electric cable is connected). When a control valve unit is configured by combining a plurality of pipes in which at least four pipes are connected to one control valve, the pipes are densely arranged. In this case, since the high-pressure pipe having a large diameter and strength and the low-pressure pipe having a small diameter and low strength are mixed and concentrated, the pulsation of the high-pressure pipe affects the low-pressure pipe, and the low-pressure pipe becomes a high-pressure pipe. And could be damaged by the friction.
[0005]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a piping structure of a control valve unit that prevents interference between a high-pressure pipe and a low-pressure pipe and improves the life of the low-pressure pipe. .
[0006]
[Means for Solving the Problems]
In the present invention, the control valve unit is fixedly arranged on the lower frame via the bracket, thereby forming spaces through which pipes can pass above and below the control valve unit. One of a pipe and a plurality of low-pressure pipes is passed, and the other is passed through the lower space.
[0007]
According to this, the upper space of the control valve unit is set as the space for the high-pressure piping and the lower space is set as the space for the low-pressure piping. The resulting contact between the high-pressure pipe and the low-pressure pipe is eliminated, and there is no fear that the low-pressure pipe is worn or ruptured. In addition, since the piping is divided into high-pressure piping and low-pressure piping in the space in the vertical direction of the control valve unit, it is easy to determine the type of piping, and maintenance is improved.
[0008]
The lower space was formed by attaching the control valve unit to a portal bracket provided upright on the lower frame. Alternatively, the upper space is provided by attaching the control valve unit to a bracket suspended from a floor provided on the lower frame.
According to this configuration, a space can be easily formed above and below the control valve unit, so that passage through each pipe can be easily performed.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the piping structure of the control valve unit according to the present invention will be described with reference to the drawings. 1 is a side view of a hydraulic shovel as an example to which the present invention is applied, FIG. 2 is a plan view of the hydraulic shovel shown in FIG. 1, and FIG. 3 is a piping structure of a control valve unit according to the present invention. FIG. 4 is a side view of the piping structure of the control valve unit shown in FIG. The components having the same configuration as the prior art are denoted by the same reference numerals, and description thereof will be omitted.
[0011]
In the drawing, reference numeral 1 denotes a hydraulic excavator, which is a lower traveling body 2 which can travel freely, an upper revolving body 3 which is rotatably mounted on an upper part of the lower traveling body 2, and an upper revolving body. 3 and an attachment 4 connected to the front part so as to be able to freely lie. The lower traveling body 2 is allowed to travel by driving a pair of traveling motors 8 which are one of the actuators. The upper swing body 3 is swingable by driving a swing motor (not shown) which is one of the actuators.
[0012]
The attachment 4 has a boom 5 having one end connected to the front part of the upper swing body 3, an arm 6 having one end connected to the other end of the boom 5, and one end connected to the other end of the arm 6. And a bucket 7. The boom 5 is vertically rotatable by a telescopic operation of a boom cylinder 5 a (one of the actuators) whose both ends are connected to the front part of the upper swing body 3 and the abdominal surface of the boom 5. The arm 6 is vertically rotatable by a telescopic operation of an arm cylinder 6a (one of the actuators) whose both ends are connected to the back surface of the boom 5 and the end of the arm 6 on the boom 5 side. The bucket 7 is vertically rotatable by a bucket cylinder 7a (one of the actuators) connected at both ends to the back surface of the arm 6 and the back surface of the bucket 7.
[0013]
The upper swing body 3 is provided with a lower frame 9 on which various devices are mounted, and a driver's seat 10 on which an operator sits is provided above the lower frame 9. On both left and right sides of the driver's seat 10, a pair of operation levers 12, which are control devices for operating the actuator, are provided. In front of the driver's seat 10, a pair of traveling levers 13 serving as a steering device are provided with a floor 14 interposed therebetween. A canopy 11 is provided above the driver's seat 10 to protect the operator from rainwater.
[0014]
At least the rear portion of the upper revolving unit 3 is formed in a substantially arc shape with a radius R in plan view. Even when the upper revolving unit 3 turns, the rear portion is within the vehicle width of the lower traveling unit 2. It is set to fit. In this case, the operator can perform the work without worrying about the situation where the rear portion of the upper swing body 3 comes into contact with an obstacle, so that there is no concern that the work efficiency is reduced.
[0015]
A control valve unit 16 is provided between the bottom plate 15 and the floor 14 in the lower frame 9. The control valve unit 16 is arranged at a height h higher than the bottom plate 15 by a gate-shaped bracket 17. The control valve unit 16 has a plurality of low-pressure pilot pipes 36 connected to its front and rear surfaces, and a plurality of high-pressure main pipes 37 connected to its upper surface. After being pulled out from the control valve unit 16, the plurality of low-pressure pipes pass through a space below the control valve unit 16 and are connected to, for example, a remote control valve 13 a of the traveling lever 13 or to a switching valve 18 ( Alternatively, it is directly connected to the remote control valve of the operation lever 12). On the other hand, the plurality of high-pressure pipes are configured to pass above the control valve unit 16 and be connected to each actuator. As described above, in the present invention, the upper space of the control valve unit 16 is set as the space a for the high-pressure pipe and the lower space is set as the space b for the low-pressure pipe, so that the high-pressure pipe and the low-pressure pipe are mixed and concentrated as in the related art. There is no contact between the high-pressure pipe and the low-pressure pipe caused by the arrangement, and there is no need to worry about wear or rupture of the low-pressure pipe. In addition, since the piping is divided into high-pressure piping and low-pressure piping in the space in the vertical direction of the control valve unit 16, it is easy to determine the type of piping, and maintenance is improved. This is particularly effective for a machine in which the upper swing body 3 itself is small as shown in FIGS.
[0016]
In the present invention, the case where the control valve unit 16 is supported by the gate-shaped bracket 17 has been described. However, the present invention is not limited to this. For example, the control valve unit 16 may be suspended from the floor. . Further, here, an example in which the high-pressure pipe passes above the control valve unit 16 has been described, but the present invention is not limited to this, and when the high-pressure pipe is connected to the lower surface of the control valve unit 16, the control valve The space below the unit 16 may be a space through which the high-pressure pipe passes. In this case, the low-pressure pipe passes above the control valve unit 16.
[0017]
【The invention's effect】
According to the first aspect of the present invention, the upper space of the control valve unit is set as the space for the high-pressure piping, and the lower space is set as the space for the low-pressure piping. There is no contact between the high-pressure pipe and the low-pressure pipe caused by the arrangement, and there is no need to worry about wear or rupture of the low-pressure pipe. In addition, since the piping is divided into high-pressure piping and low-pressure piping in the space in the vertical direction of the control valve unit, it is easy to determine the type of piping, and maintenance is improved.
[0018]
According to the second or third aspect of the present invention, a space can be easily formed above and below the control valve unit, so that passage through each pipe can be easily performed.
[Brief description of the drawings]
FIG. 1 is a side view of a hydraulic excavator to which the present invention is applied as an example.
FIG. 2 is a plan view of the hydraulic excavator shown in FIG.
FIG. 3 is a plan view showing a piping structure of a control valve unit according to the present invention.
FIG. 4 is a side view of a piping structure of the control valve unit shown in FIG.
FIG. 5 is a general hydraulic circuit diagram.
[Explanation of symbols]
5a: Boom cylinder 6a: Arm cylinder 7a: Bucket cylinder 8: Travel motor 12: Operation lever 13: Travel lever 16: Control valve unit 17: Bracket 36: Pilot pipe 37: Main pipe a: High pressure pipe space b: Low pressure pipe Space for

Claims (3)

A lower traveling structure, an upper revolving structure that is rotatably mounted on the upper portion of the lower traveling structure and has a rear portion formed to be rotatable within the vehicle width of the lower traveling structure during turning, and Attachments that are movably connected,
An actuator for driving each of the lower traveling structure, the upper revolving superstructure, and the attachment, and a control valve unit to which a plurality of high-pressure pipes connected to the actuator and a plurality of low-pressure pipes connected to a remote control valve of the control device are provided. In hydraulic excavators,
The upper revolving unit has a lower frame on which equipment is mounted,
By fixedly disposing the control valve unit on the lower frame via a bracket, spaces are formed above and below the control valve unit to allow piping to pass therethrough,
A piping structure for a control valve unit of a hydraulic excavator , wherein one of the plurality of high-pressure pipes or the plurality of low-pressure pipes passes through the upper space, and the other passes through the lower space . The piping structure for a control valve unit of a hydraulic shovel according to claim 1 , wherein the lower space is formed by attaching the control valve unit to a portal bracket provided on the lower frame . The piping structure for a control valve unit of a hydraulic shovel according to claim 1 , wherein the upper space is formed by attaching the control valve unit to a bracket suspended from a floor provided on the lower frame .

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