JPH11190044A - Hydraulic control valve device of hydraulic shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate piping and reduce hydraulic loss, and to enable the prevention of damage caused by external force. SOLUTION: A hydraulic control valve device of a hydraulic shovel is constituted of a main body block 41 and a combined current block 42 connected to the main body block, directional selector valves for controlling actuators are arranged in a row in the main body block 41, and a supply port for supplying hydraulic fluid to the actuators is opened on the same surface of the main body block 41. A pass linking with the directional selector valves is formed in the combined current block 42 and, at the same time, the directional selector valves having no supply port is included. The hydraulic control valve device is located between an engine in the rear of a turning base and a turning motor 18 driving the turning base, and the supply port is opened forward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic control valve device for a hydraulic shovel, and more particularly to a centabreed type hydraulic control valve device for supplying and discharging hydraulic oil from a hydraulic source such as a hydraulic pump to each actuator.

[0002]

2. Description of the Related Art Conventionally, a centabreed type hydraulic control valve device (control valve device) for operating each actuator of a hydraulic shovel has a spool of a direction switching valve.
The supply ports to the actuators are divided, and a merging block for connecting the directional control valve is installed between them (for example, see Japanese Utility Model Publication No. 5-10043). A hydraulic pump, an engine for driving the hydraulic pump, a slewing motor for driving the slewing table, a hydraulic oil tank, an operator cab, a control valve, and the like are arranged on the slewing table.

[0003]

However, in the above-mentioned prior art, the structure of the control valve device is complicated because the valve bodies are connected to both sides of the merging block. Also, hydraulic pumps, engines, rotating motors, hydraulic oil tanks, cabs, hydraulic hoses connecting the control valves, etc., which are arranged on the swivel table, are bent at various places and become complicated, which makes piping work complicated. This not only causes a hydraulic pressure loss, but also causes a problem that an external force is easily applied to the hydraulic hose and the hydraulic piping, which is likely to cause damage.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a simple structure, and can be easily piped without complicatedly bending hydraulic hoses and hydraulic pipes, thereby reducing hydraulic loss. It is an object of the present invention to provide a hydraulic control valve device for a hydraulic shovel, which can prevent damage due to external force.

[0005]

To achieve the above object, a hydraulic control valve device for a hydraulic shovel according to the present invention comprises a main body block and a merging block connected to the main body block. In the block, a direction switching valve for operating each actuator including a boom cylinder, an arm cylinder, a bucket cylinder, a traveling motor, and a swing motor is arranged in a row, and a supply port for supplying hydraulic oil to each of the actuators is provided in the main body block. And a passage communicating with the direction switching valve is formed in the merging block.

[0006] The merging block may have a switching valve without a supply port, and the main body block and the merging block are located between the engine behind the swivel base and the swivel motor for driving the swivel base. The supply port may be opened toward the front of the swivel.

According to the hydraulic control valve device of the hydraulic shovel configured as described above, the configuration is simplified, piping work to each actuator and the like can be easily performed, and hydraulic pressure loss can be reduced. External force is hardly applied to the hydraulic hose and the like, and damage can be prevented.

[0008]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view of a hydraulic excavator,
FIG. 2 is an enlarged plan view of a main part in FIG. 1 and 2, a hydraulic excavator 10 includes left and right traveling motors 12, 1
A turntable 16 is mounted on a chassis having left and right crawlers 14 and 15 driven by the turntable 3 so as to be turned by a turn motor 18. On the revolving base 16, in addition to the revolving motor 18, an operator cab 20, a hydraulic tank 22, an engine 24, and the like are installed.
6 are installed. A boom 28 is provided in front of the swivel base 16.
Are swingably supported by the boom cylinders 29, 29. An arm 30 is swingably supported by an arm cylinder 31 at the tip of the boom 28. At the end of the arm 30, a bucket 32 has a swinging rod 33 and a connecting rod 34.
And is swingably supported by the bucket cylinder 35 via the.

A hydraulic hose 36 and a hydraulic pipe 37 are connected to the traveling motors 12 and 13, the swing motor 18, the boom cylinders 29 and 29, the arm cylinder 31, and the bucket cylinder 35 from the hydraulic control valve device 26. . The hydraulic excavator 10 is provided with a piping section for each actuator in front of the swivel base 16.
And the hydraulic control valve device 26 composed of the merging block 42 is connected to the engine 24 behind the swivel base 16 and the swivel base 16.
And a plurality of supply ports (to be described later) of the main body block 41 are opened forward.

The hydraulic control valve device 26 will now be described in detail with reference to FIGS. 3 is a plan view of one embodiment of the hydraulic control valve device, FIG. 4 is a front view thereof, and FIG. 5 is a hydraulic circuit diagram. The hydraulic control valve device 26 includes the main body block 4
1 and a merging block 42. The main body block 41 operates each actuator composed of the traveling motors 12, 13, the turning motor 18, the boom cylinders 29, 29, the arm cylinder 31, and the bucket cylinder 35.
The three directional switching valves 43, 44, 45, 46, 47, 48 are arranged in a row, and supply ports 43a, 44a, 45a, 46a, 47a, 47a, 4a for supplying hydraulic oil to each actuator.
8a is opened on the same surface on one side in front.

The direction switching valves 43 and 44 operate left and right traveling motors 12 and 13, respectively, and the direction switching valve 45 operates the turning motor 18. The direction switching valve 46 is for operating the boom cylinders 29, 29, the direction switching valve 47 is for operating the arm cylinder 31, and the direction switching valve 48 is for operating the bucket cylinder 3
5 is operated. Normally, electromagnetically controlled spool valves are used for the six directional control valves described above, and spool covers 43b, 44b, 45b, 46b, 47b, 48b
Project above the main body block 41. As described above, the supply ports 43a to 48a of the directional control valve are opened on the same surface on one side in front of the main body block 41. In the main body block 41, a center bypass passage 4 is provided.
9, 50, parallel passages 51, 52 are formed,
Multiple check valves are built in.

The merging block 42 is connected to the other side behind the main body block 41 and has hydraulic pump ports 53, 5, and 5.
4. A directional control valve having a passage communicating with the oil drain port 55 and the directional control valves 43 to 48, and having an arm convergence valve 56, a boom convergence valve 57, and convergence switching valves 58, 59 as a directional control valve having no supply port. . In the merging block 42, pump control orifices 60 and 61 are provided.
Is built-in. Hydraulic pump ports 53 and 54 and a drain port 55 are provided on the rear surface of the merging block 42. The hydraulic pump port 53 is connected to the center bypass passage 4.
9. The hydraulic pump port 5 which is communicated with the parallel passage 51
4 is communicated with the center bypass passage 50 and the parallel passage 52. In the merging block 42, a plurality of check valves are additionally provided.

One embodiment of the hydraulic control valve device for a hydraulic shovel according to the present invention has the above-described configuration, and the operation will be described below. Operation lever etc. in the cab (not shown)
, The hydraulic control valve device 26 is operated, and hydraulic oil is supplied from the hydraulic tank 22 to each actuator. For example, when the excavator 10 is moved forward and backward, the traveling motor 1 is operated by operating the direction switching valves 43 and 44.
2 and 13 are operated, and the crawlers 14 and 15 are rotated to move forward and backward. When the swivel 16 is turned, the direction switching valve 45 is controlled and the turning motor 18 is operated. Similarly, boom 28, arm 30, bucket 3
2 are operated, the direction switching valves 46, 4
7 and 48 are controlled to operate the boom cylinders 29 and 29, the arm cylinder 31, and the bucket cylinder 35.

In the hydraulic control valve device 26, as described above, the direction switching valves 43 to 48 for operating the respective actuators by the main body block 41 are arranged in a row, and the supply ports 43a to 43h for supplying the operating oil to the respective actuators. 48a is opened on the same surface on one side in front of the body block 4a.
Since the merging block 42 is connected to the other side behind 1, the structure can be simplified, and the hydraulic hose 36 and the hydraulic piping 37
Can be piped in a line toward the front. Therefore, the hydraulic hose 36 and the hydraulic pipe 37 can be piped in a shape close to a straight line without using a bent pipe such as an elbow, and even when a bend is required, the pipe can be piped with a relatively large radius of curvature. . Further, since a bend having a small radius of curvature can be avoided, hydraulic pressure loss can be reduced. Further, since the bending can be reduced, the piping itself can be shortened, and the piping can be prevented from being damaged due to careless application of external force.

The convergence block 42 incorporates the directional switching valves 56 and 57 having no supply ports, so that the piping can be shortened and made efficient. Further, the hydraulic excavator 10 includes a piping section for each actuator in front of the swivel base 16, and the main body block 41 and the merging block 42 are connected to the engine 24 behind the swivel base 16 and the swivel motor 18 that drives the swivel base 16. Between the supply ports 43a to 48a
Is opened forward, so that the hydraulic hose 36 and the hydraulic pipe 37 can be short and efficiently piped.

In the above-described embodiment, an example is shown in which six directional control valves are arranged in one row. However, the present invention is not limited to this. For example, an optional directional control valve may be provided. You may comprise. Also, the spool of the directional control valve is shown as being arranged in one row in the vertical direction,
Needless to say, the spools may be arranged in one row in the horizontal direction.

[0017]

As described above, according to the present invention,
The configuration of the hydraulic control valve device is simplified, and the hydraulic hose and the hydraulic piping can be easily, shortly and efficiently piped without complicated bending, and hydraulic pressure loss can be reduced. In addition, since the bending of the hydraulic hose and the hydraulic piping is small and the piping can be short, damage to the hydraulic hose and the hydraulic piping due to external force can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a hydraulic shovel using a hydraulic control valve device for a hydraulic shovel according to the present invention.

FIG. 2 is an enlarged plan view of a main part in FIG.

FIG. 3 is a plan view of one embodiment of a hydraulic control valve device for a hydraulic shovel according to the present invention.

FIG. 4 is a front view of one embodiment of the hydraulic control valve device for the hydraulic shovel according to the present invention.

FIG. 5 is a hydraulic circuit diagram using the hydraulic control valve device of the hydraulic shovel according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Hydraulic excavator 12, 13 Traveling motor 14, 15 Crawler 16 Swivel table 18 Swing motor 20 Operator's cab 22 Hydraulic tank 24 Engine 26 Hydraulic control valve device 28 Boom 29 Boom cylinder 30 Arm 31 Arm cylinder 32 Bucket 33 Swing rod 34 Connecting rod 35 Bucket cylinder 36 Hydraulic hose 37 Hydraulic piping 41 Main block 42 Merging block 43, 44, 45, 46, 47, 48 Direction switching valve 43a, 44a, 45a, 46a, 47a, 48a Supply port 43b, 44b, 45b, 46b, 47b , 48b Spool cover 49, 50 Center bypass passage 51, 52 Parallel passage 53, 54 Hydraulic pump port 55 Drainage port 56 Arm merging valve 57 Beam merging valve 58, 59 Merging switching valve 60, 61 Office

Claims (3)

[Claims] 1. A main body block and a merging block connected to the main body block. Each actuator including a boom cylinder, an arm cylinder, a bucket cylinder, a traveling motor, and a turning motor is operated in the main body block. A direction switching valve is arranged in a row, a supply port for supplying hydraulic oil to each actuator is opened on the same surface of the main body block, and a passage communicating with the direction switching valve is formed in the merging block. A hydraulic control valve device for a hydraulic shovel. 2. The hydraulic control valve device for a hydraulic shovel according to claim 1, wherein the merging block has a direction switching valve without a supply port. 3. A main body block and a merging block are located between an engine behind the swivel base and a swivel motor for driving the swivel base, and a supply port of the main body block is opened toward the front of the swivel base. 2. The method according to claim 1, wherein
Or a hydraulic control valve device for a hydraulic shovel according to 2.