JP2006097341A

JP2006097341A - Revolving construction equipment

Info

Publication number: JP2006097341A
Application number: JP2004284932A
Authority: JP
Inventors: Tsutomu Fukumoto; Akira Noguchi; Yoshihiro Sonodai; 義弘惣野代; 務福本; 章野口
Original assignee: Hitachi Constr Mach Co Ltd; 日立建機株式会社
Priority date: 2004-09-29
Filing date: 2004-09-29
Publication date: 2006-04-13
Anticipated expiration: 2024-09-29
Also published as: JP4199173B2

Abstract

PROBLEM TO BE SOLVED: To reduce an installation space by fixing a pattern switching valve at a high position with a simple structure and to improve workability when checking and maintaining a control valve and the like.
A pattern switching valve 19 is fixed by a support column 22 that supports upward and downward, a front and rear support bracket 24 that supports front and rear directions, and a left and right support bracket 25 that supports left and right directions. As a result, the swing of the pattern switching valve 19 is distributed in the three directions of up, down, front, back, left, and right, and the swing in each direction is supported by the support 22, the front / rear support bracket 24, and the left / right support bracket 25. Can be accepted. Therefore, the support 22, the front / rear support bracket 24, and the left / right support bracket 25 can reliably fix the pattern switching valve 19 disposed at a high position. Moreover, since the support | pillar 22, the front-and-rear support bracket 24, and the left-right support bracket 25 can be made into a simple structure, an installation space can be made small and a working space can also be ensured.
[Selection] Figure 2

Description

The present invention relates to a swivel construction machine such as a hydraulic excavator provided with a working device for performing excavation work of earth and sand, for example.

In general, a hydraulic excavator is known as a swivel construction machine. The hydraulic excavator includes a self-propelled lower traveling body, an upper revolving body that is pivotably mounted on the lower traveling body, and the upper swivel. It is generally composed of a working device provided at the front of the body so as to be able to move up and down in the upward and downward directions. Moreover, the working device is constituted by a boom, an arm, a bucket, and a cylinder that drives them.

Here, the hydraulic excavator includes a small hydraulic excavator called a mini excavator suitable for work in a narrow work site. This hydraulic excavator is configured so that the turning radius of the upper turning body is substantially within the vehicle width of the lower traveling body so that the turning operation can be performed even in a narrow work site.

The upper swing body of this small hydraulic excavator is mounted on the swing frame, the engine mounted on the rear side of the swing frame and driving the hydraulic pump, and provided on the swing frame on the front side of the engine. A driver's seat on which the driver is seated, provided on the side or front of the driver's seat, left and right operation levers for operating the working device, and provided on the turning frame on the right side of the driver's seat, A hydraulic oil tank for storing hydraulic oil to be supplied to the hydraulic pump and a control valve for supplying and discharging pressure oil to and from the working device in accordance with the operation of each operation lever are roughly configured.

Some hydraulic excavators are provided with a pattern switching valve that switches a control valve that operates when the left and right operation levers are operated. This pattern switching valve switches the operation pattern according to the preference of the operator, and is provided in the middle of the pilot hose connecting the operation lever and the control valve (for example, Patent Document 1, Patent Document 2, Patent Document) 3).

JP 2003-56011 A Japanese Patent Application Laid-Open No. 11-200406 JP 2003-41621 A

And it is desirable to arrange | position a pattern switching valve in the vicinity of a control valve in consideration of handling of a pilot hose. For this reason, the pattern switching valve is located on the front side of the hydraulic oil tank like the control valve and is provided on the turning frame.

By the way, the pattern switching valve is composed of a cylindrical valve casing and a rotary valve rotatably provided in the valve casing. In this case, since many pilot hoses are connected to the valve casing, the pattern switching valve requires a certain amount of installation space. However, in a small hydraulic excavator, since the upper swing body is made small, it is difficult to secure a space for installing the pattern switching valve around the control valve. Therefore, in a small hydraulic excavator according to the prior art, the pattern switching valve is lifted by using a support base, and is arranged using the space above the control valve.

Here, the pattern switching valve is made of a metal material so that it can sufficiently withstand the pressure, vibration and the like of the pressure oil, so that its weight increases. For this reason, the support base that supports the pattern switching valve, which is a heavy object, at a high position is increased in size because it needs to be strong enough to support the pattern switching valve so as not to shake. In addition, there is a problem that the strength on the revolving frame side to which the support base is attached must be increased. In addition, when the support base is enlarged, a large installation space is required, and workability when checking and servicing the control valves disposed around is deteriorated.

The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to reduce the installation space and control by fixing the heavy duty pattern switching valve at a high position with a simple structure. An object of the present invention is to provide a swivel construction machine that can improve workability when checking and maintaining valves and the like.

A hydraulic excavator according to a first aspect of the present invention is a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and an up / down direction on a front portion of the upper revolving body. The upper swing body includes a swing frame, an engine mounted on the rear side of the swing frame and driving a hydraulic pump, and the swing frame positioned on the front side of the engine. A driver's seat provided on the operator's seat, an operating device provided in the vicinity of the driver's seat for operating the working device, and a hydraulic pump provided on the swivel frame located on the right side of the driver's seat. A hydraulic oil tank that stores hydraulic oil to be supplied; a control valve that is located on the front side of the hydraulic oil tank and is provided on the revolving frame and that supplies and discharges pressure oil to and from the working device according to the operation of the operating device; The hydraulic oil tank It comprises a partition plate that partitions the right of the driver's seat extends forwardly from between the click and the driver's seat, and a pattern switching valve for switching combination patterns of the operation pattern of the operating device and the control valve.

In order to solve the above-mentioned problem, the feature of the configuration adopted by the invention of claim 1 is that it is located on the front side of the hydraulic oil tank and extends upward and downward on the swivel frame and stands upright. A column to which the pattern switching valve is attached at a position, a front / rear support bracket provided between the hydraulic oil tank and the pattern switching valve to support the pattern switching valve in the front and rear directions, and the pattern switching valve Left and right support brackets provided between the partition plate and the pattern switching valve, and the pattern switching valve is moved in three directions by these columns, front and rear support brackets, and left and right support brackets. The configuration is fixed.

According to a second aspect of the present invention, the support column is erected upward from the control valve, and the front and rear support brackets and the left and right support brackets support the pattern switching valve above the control valve. It is in.

According to the first aspect of the present invention, when the force for swinging the pattern switching valve is applied, the swing in the upward and downward directions can be received by the support column, and the swing in the forward and backward directions can be received. Can be received by the front and rear support brackets, and left and right swings can be received by the left and right support brackets. Thereby, even when the pattern switching valve is arranged at a high position, the support column, the front and rear support brackets, and the left and right support brackets can be reliably fixed so as not to shake the pattern switching valve.

In addition, the struts, the front and rear support brackets, and the left and right support brackets each have only a simple tensile strength and compressive strength without considering the strength against one direction, that is, torsion, etc. For example, a thin and small diameter can be formed using a light and inexpensive material.

As a result, the installation space for attaching the support column to the revolving frame can be reduced, so that the pattern switching valve can be provided even in a narrow place. In addition, by simplifying the support column, the front and rear support brackets, and the left and right support brackets, it is possible to secure a space around the control valve and the like, thereby improving workability when performing inspection and maintenance. Furthermore, since it is not necessary for the revolving frame to increase the strength of the portion to which the support column is attached, the structure of the revolving frame can be simplified.

According to the invention of claim 2, the pattern switching valve can be disposed above the control valve by the support, and the front and rear support brackets and the left and right support brackets can be disposed above the control valve. The pattern switching valve, the front and rear support brackets, and the left and right support brackets can be provided using this space.

Hereinafter, a small hydraulic excavator will be described as an example of a swivel construction machine according to an embodiment of the present invention, and will be described in detail with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a cab specification hydraulic excavator. The hydraulic excavator 1 includes a self-propelled lower crawler traveling body 2, and an upper revolving body 3 rotatably mounted on the lower traveling body 2. The working device 4 is provided to the front side of the upper swing body 3 so as to be able to swing and elevate.

Here, the working device 4 includes a boom 4A attached to a swing post 6 described later so as to be able to move up and down, an arm 4B attached rotatably to the tip of the boom 4A, and a tip of the arm 4B. A bucket 4C rotatably attached, a boom cylinder 4D provided between the swing post 6 and the boom 4A, an arm cylinder 4E provided between the boom 4A and the arm 4B, an arm 4B and the bucket It is roughly constituted by a bucket cylinder 4F provided between 4C. Further, the boom cylinder 4D, the arm cylinder 4E, and the bucket cylinder 4F of the work device 4 are connected to the control valve 16 via a hydraulic hose 17 described later.

Further, the upper turning body 3 is formed in a substantially circular shape when viewed from above so that it can turn substantially within the vehicle width of the lower traveling body 2. The upper swing body 3 includes a swing frame 5, an engine 8, a hydraulic pump 9, a driver's seat 12, a work operation lever 13, a hydraulic oil tank 15, a control valve 16, a pattern switching valve 19, a column 22, and front and rear support brackets. 24, left and right support brackets 25, and the like.

Reference numeral 5 denotes a turning frame constituting a support structure of the upper turning body 3. As shown in FIG. 3, the swivel frame 5 includes a bottom plate 5A made of a substantially D-shaped flat plate with the right front side cut out, and a pair of vertical plates standing upright on the upper surface side of the bottom plate 5A. Plates 5B, 5B, a support bracket 5C provided at the tip of each vertical plate 5B, and a left and right side provided so as to be positioned at the front of the bottom plate 5A and substantially perpendicular to the vertical plates 5B The bottom plate 5A covers the front beam 5D extending in the direction, the middle beam 5E extending left and right at the rear position of each vertical plate 5B, and the notch portion formed in the right front portion of the bottom plate 5A. The control valve mounting plate 5F is generally configured.

6 is a swing post attached to the support bracket 5C of the revolving frame 5. The swing post 6 is connected to the support bracket 5C via a connecting pin (not shown). It can swing rightward. The boom 4A of the working device 4 is attached to the swing post 6 so as to be able to move up and down, and a swing cylinder 7 provided between the swing frame 5 is expanded and contracted to move the working device 4 left and right. Can swing.

Reference numeral 8 denotes an engine mounted on the rear side of the revolving frame 5. The engine 8 is disposed in a horizontal state extending in the left and right directions, and a cooling fan 8A is provided on the right side thereof. A hydraulic pump 9 driven by the engine 8 is attached to the left side of the engine 8, and the hydraulic pump 9 is connected to a hydraulic oil tank 15 and a control valve 16 described later via a hydraulic hose (not shown). It is connected to the.

A heat exchanger 10 is located on the right side of the engine 8 and is provided on the revolving frame 5. The heat exchanger 10 includes a radiator 10A, an oil cooler 10B, and the like arranged in a stacked manner. And the heat exchanger 10 is arrange | positioned in the right rear part of the turning frame 5 so that the cooling fan 8A of the engine 8 may be faced.

On the other hand, 11 is a floor plate (see FIGS. 1, 2, and 4) positioned above the revolving frame 5 and laid in front of the engine 8, and the front side of the floor plate 11 extends to the front beam 5 D of the revolving frame 5. The right side extends to the vicinity of a later-described hydraulic oil tank 15.

Reference numeral 12 denotes a driver's seat (see FIGS. 1 and 2) provided on the floor plate 11 of the revolving frame 5 and positioned on the front side of the engine 8, which is seated by an operator who operates the excavator 1. And it is attached on the floor board 11 via a base (not shown) etc.

Reference numeral 13 denotes a work operation lever (only the right side is shown) as an operation device provided on both the left and right sides of the driver's seat 12. The work operation lever 13 tilts the front and rear directions and the left and right directions to move the work device 4 up and down and to turn the upper swing body 3. Reference numeral 14 denotes a traveling operation lever provided on the floor plate 11 in front of the driver's seat 12. The traveling operation lever 14 tilts forward and backward to move the lower traveling body 2 forward. , Running backwards and so on.

A hydraulic oil tank 15 is located on the right side of the driver's seat 12 and is mounted on the revolving frame 5. The hydraulic oil tank 15 stores hydraulic oil supplied to the hydraulic pump 9 therein. Further, the hydraulic oil tank 15 is formed using, for example, a steel plate because pressure is applied to the inside so that the hydraulic oil can be efficiently supplied toward the hydraulic pump 9. That is, the hydraulic oil tank 15 is formed in a vertically long box shape by fixing the front plate 15A, the rear plate 15B, the left side plate 15C, the right side plate 15D, the top plate 15E, and the bottom plate 15F using welding means or the like. Yes.

Further, the front plate 15A of the hydraulic oil tank 15 is provided with a flow dividing control valve 15G located on the upper right side, and the flow dividing control valve 15G includes the cylinders 4D, 4E, 4F of the work device 4, a heat exchanger. 10 oil cooler 10B and the like. The shunt control valve 15G causes the hydraulic oil returned from the cylinders 4D, 4E, 4F, etc. of the working device 4 to flow directly into the hydraulic oil tank 15 when the temperature is low, and heat exchanger when the temperature is high. 10 is controlled to flow into the hydraulic oil tank 15 via the oil cooler 10B. Further, a screw seat plate 15H is fixed to the front plate 15A of the hydraulic oil tank 15 at a position avoiding the diversion control valve 15G to the lower left using welding means or the like. The connecting arm 24B of the bracket 24 is attached.

Reference numeral 16 denotes a control valve located on the front side of the hydraulic oil tank 15 and provided on the control valve mounting plate 5F of the revolving frame 5. The control valve 16 is driven in accordance with the operation of each work operation lever 13. The hydraulic pilot type spool valve is connected in the front and rear direction. That is, the control valve 16 is a boom control valve that controls the boom cylinder 4D of the work device 4, an arm control valve that controls the arm cylinder 4E, a bucket control valve that controls the bucket cylinder 4F, and a swing that controls a swing motor 29 described later. A motor control valve, a control valve for controlling other actuators, and the like are roughly configured.

A boom control valve, an arm control valve, a bucket control valve, and a swing motor control valve constituting the control valve 16 are connected to a pattern switching valve 19 (described later) via a pilot hose (not shown), and a hydraulic hose 17 ( 1) and the like, and connected to the boom cylinder 4D, the arm cylinder 4E, the bucket cylinder 4F, and the like. The control valve 16 may not be provided on the control valve mounting plate 5F provided in the revolving frame 5, but may be directly attached to the bottom plate 5A, for example, or a separately provided bracket (not shown) or the like may be used. It is good also as a structure attached to bottom board 5A grade | etc.,.

Reference numeral 18 denotes a partition plate extending forward from between the hydraulic oil tank 15 and the driver seat 12, and the partition plate 18 partitions the right side of the driver seat 12. Specifically, the partition plate 18 is provided on the left side of the hydraulic oil tank 15 and partitions between the driver's seat 12, the hydraulic oil tank 15, the control valve 16, and a pattern switching valve 19 described later. Thereby, the partition plate 18 shields the operating sound of the control valve 16 and the like and the heat of the hydraulic oil tank 15, the control valve 16, the pattern switching valve 19 and the like and covers them. Also, in winter, there is a function to prevent the cold wind from blowing toward the operator. Furthermore, the partition plate 18 can also be used as a mounting base for mounting various components.

And the partition plate 18 inclines downward toward the front side from the intermediate part of the front and back direction so that the front side part of the right cover 32 mentioned later may be followed. The rear side of the partition plate 18 reaches the vicinity of the heat exchanger 10 and is attached to the upper surface plate 15E of the hydraulic oil tank 15 through the bracket 18A and the like. On the other hand, the front side of the partition plate 18 is attached to, for example, a bracket (not shown) provided on the revolving frame 5, the floor plate 11, and the like. Further, a screw seat plate 18B is fixed to the partition plate 18 near the front side of the right side surface by welding means, and a connecting plate 25B of a left and right support bracket 25 described later is attached to the screw seat plate 18B. It is done.

Reference numeral 19 denotes a pattern switching valve provided on the front side of the hydraulic oil tank 15, and the pattern switching valve 19 is controlled by a post 22, a front / rear support bracket 24, and a left / right support bracket 25, which will be described later, as shown in FIG. It is supported above the valve 16. The pattern switching valve 19 is provided in the middle of a pilot hose (not shown) that connects the boom control valve, arm control valve, bucket control valve, and swing motor control valve of the control valve 16 to the left and right work operation levers 13. Is provided.

Here, the pattern switching valve 19 includes, for example, a valve body 20 incorporating a directional control valve (not shown), as in the rotary type switching valve described in Japanese Utility Model Publication No. 2-22482, The switching lever 21 is provided on the upper side and switches the direction control valve. Further, as shown in FIG. 5, the valve body 20 is provided with, for example, four screw holes 20A for attaching the support posts 22 on the lower surface portion, and screw holes for attaching the front and rear support brackets 24 and the left and right support brackets 25 on the upper surface portion. For example, two 20Bs are provided.

The pattern switching valve 19 rotates the switching lever 21 by a predetermined angular dimension so that the control valve group 34 is operated when the left and right work operation levers 13 are operated in the front, rear, left and right directions. The boom control valve, the arm control valve, the bucket control valve, and the swing motor control valve are switched to control which one of them is operated, and the combination pattern is switched to a plurality of types.

Reference numeral 22 denotes a column which is erected on the control valve mounting plate 5F of the swing frame 5 to support the pattern switching valve 19 in the upward and downward directions. The column 22 moves the pattern switching valve 19 above the control valve 16. When a swing (vibration) is caused by running and work of the hydraulic excavator 1, the components in the upward and downward directions are received. And the support | pillar 22 is formed by bending the both ends of a strip-shaped steel plate, for example in a U shape. Further, for example, two nuts 22B (only one is shown) are welded to the upper surface of the lower plate 22A located on the lower side of the support post 22. On the other hand, four bolt insertion holes 22 D are formed in the upper plate 22 C located on the upper side of the support column 22 corresponding to the screw holes 20 A of the valve main body 20 constituting the pattern switching valve 19.

Here, as shown in FIGS. 4 and 5, the support column 22 is disposed at the rear portion of the control valve mounting plate 5F of the swing frame 5 so that the lower plate 22A enters the lower side of the control valve 16, and the nut 22B from the lower side. The bolt 23 is screwed to the control valve mounting plate 5F. In addition, the support column 22 has the valve body 20 of the pattern switching valve 19 placed on the upper plate 22C, and the bolt 23 is screwed into the screw hole 20A of the valve body 20 through the bolt insertion hole 22D, whereby the pattern switching valve 19 is mounted. Can be fixed.

Reference numeral 24 denotes a front / rear support bracket that supports the pattern switching valve 19 in the front and rear directions. The front / rear support bracket 24 is formed by attaching the pattern switching valve 19 to the hydraulic oil tank 15 on the rear side of the pattern switching valve 19. When a vibration (vibration) is generated in the hydraulic excavator 1, components in the front and rear directions of the vibration are received. The front / rear support bracket 24 is configured by fixing a flat mounting plate 24A and a connecting arm 24B provided extending from the left end of the mounting plate 24A to the rear side using welding means. . Further, two bolt insertion holes 24 C are formed on the right side of the mounting plate 24 A corresponding to the screw holes 20 B of the valve body 20. Further, the rear end portion of the connecting arm 24B is bent at a substantially right angle, and a bolt insertion hole 24D is formed in the bent portion.

Here, the front / rear support bracket 24 has the mounting plate 24A placed on the upper surface of the valve body 20 of the pattern switching valve 19, and the mounting plate 25A of the left / right support bracket 25 to be described later is placed on the upper side of the bolt insertion hole 24C. By screwing the bolt 23 inserted through to the screw hole 20 A of the valve body 20, the bolt 23 can be attached to the pattern switching valve 19 in a tightened state. When the mounting plate 24A is mounted on the valve body 20 of the pattern switching valve 19, the rear end portion of the connecting arm 24B is disposed on the screw seat plate 15H provided on the front plate 15A of the hydraulic oil tank 15, and in this state The bolt 23 inserted into the bolt insertion hole 24D from the front side is screwed into a screw hole (not shown) of the screw seat plate 15H, whereby the hydraulic oil tank 15 can be fixed. Thereby, the front-rear support bracket 24 can be fixed in a state in which the pattern switching valve 19 is supported in the front and rear directions by using the hydraulic oil tank 15 disposed on the rear side.

A left and right support bracket 25 supports the pattern switching valve 19 in the left and right directions. The left and right support bracket 25 is a hydraulic excavator by attaching the pattern switching valve 19 to the partition plate 18 on the left side of the pattern switching valve 19. When a vibration (vibration) occurs in 1, the left and right components of the vibration are received.

The left and right support brackets 25 have a mounting plate 25A in which a flat plate is bent in an L shape, a right end portion fixed to the back surface of the mounting plate 25A using welding means or the like, and a left end portion extending to the left side is a rear side. And a connecting plate 25B bent substantially at a right angle toward. The mounting plate 25A has two bolt insertion holes 25C corresponding to the screw holes 20B of the valve body 20 constituting the pattern switching valve 19. Furthermore, for example, two bolt insertion holes 25D are formed in the bent portion at the left end of the connecting plate 25B. Further, the connecting plate 25B is formed by gently bending the upper and lower portions of the L-shaped plate body from the upper and lower intermediate portions to the rear side. By using this shape, for example, a buzzer, It can also serve as a mounting base for mounting an engine controller (both not shown) and the like.

Here, the left and right support brackets 25 are obtained by placing the mounting plate 25A on the mounting plate 24A of the front and rear support bracket 24 and screwing the bolt 23 inserted from above into the bolt insertion hole 25C into the screw hole 20A of the valve body 20. The pattern switching valve 19 can be attached together. Further, the left end portion of the connecting plate 25B is brought into contact with a screw seat plate 18B provided on the partition plate 18, and in this state, the bolt 23 inserted from the right side into the bolt insertion hole 25D is inserted into a screw hole (not shown) of the screw seat plate 18B. To the partition plate 18 by screwing. Accordingly, the left and right support brackets 25 can be fixed in a state in which the pattern switching valve 19 is supported in the left and right directions using the partition plate 18 disposed on the left side.

As described above, the support column 22 that receives the upward and downward swings of the pattern switching valve 19, the front and rear support bracket 24 that receives the forward and backward swings of the pattern switching valve 19, and the left side of the pattern switching valve 19. The left and right support brackets 25 that accept rightward swings can be reliably received by distributing the swings acting on the pattern switching valve 19 in three directions, and the pattern switching valve 19 is securely fixed so as not to swing. be able to.

Reference numeral 26 denotes a fuel tank provided on the left side of the revolving frame 5, and 27 denotes a battery arranged on the front side of the fuel tank 26. Reference numeral 28 denotes a center joint provided at the turning center of the turning frame 5, and 29 denotes a turning motor provided near the center joint 28 for turning the upper turning body 3 relative to the lower traveling body 2.

On the other hand, 30 is an exterior cover provided on the revolving frame 5 so as to surround the rear side, the right side, etc. of the driver's seat 12, and the exterior cover 30 is located on the rear side of the driver's seat 12 and can be opened and closed. A rear cover 31 that covers the engine 8 and the like, and a right cover 32 that extends from the right side of the rear cover 31 to the front side and covers the hydraulic oil tank 15, the control valve 16, the pattern switching valve 19 and the like together with the partition plate 18. It is roughly structured. Reference numeral 33 denotes a canopy that covers the upper side of the driver's seat 12.

Here, the right cover 32 is inclined downward toward the front side in order to widen the right front view of the operator seated on the driver's seat 12. The right cover 32 is attached to the revolving frame 5 side so that the front side portion can be opened and closed. As shown in FIG. 2, when the right cover 32 is opened, operation pattern switching work, hydraulic oil filling, Replacement work, maintenance work of the control valve 16 and the like can be performed.

The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

First, the operator can travel the lower traveling body 2 by sitting on the driver's seat 12 and operating the traveling operation lever 14. Further, by operating the left and right work operation levers 13, the boom 4A, the arm 4B, the bucket 4C, and the like of the work device 4 can be operated to perform soil excavation work and the like.

Here, when the operation pattern of the left and right work operation levers 13 does not match his / her preference, the right cover 32 of the exterior cover 30 is opened and the switching lever 21 of the pattern switching valve 19 is rotated. Thus, the operation pattern can be adjusted to the user's preference.

When the control valve 16 disposed below the pattern switching valve 19 is inspected and maintained, the column 22 supporting the pattern switching valve 19, the front and rear support brackets 24, and the left and right support brackets 25 are thin plate members. Since it is formed using a small diameter pipe material or the like, a wide working space can be secured, and inspection and maintenance can be easily performed.

Thus, according to the present embodiment, when a force that swings the pattern switching valve 19 is applied, the swing is distributed in three directions, ie, upward, downward, forward, backward, left, and right. Thus, the load in the upper and lower directions can be received, the load in the front and rear directions can be received by the front and rear support bracket 24, and the load in the left and right directions can be received by the left and right support brackets 25. Thereby, even when the pattern switching valve 19 is disposed at a high position, the support column 22, the front and rear support bracket 24, and the left and right support bracket 25 can reliably fix the pattern switching valve 19 so as not to shake.

Moreover, the support column 22, the front and rear support brackets 24, and the left and right support brackets 25 each have a simple tensile strength and compressive strength without considering the torsional strength and the like. The structure can be formed thin or small in diameter using a light and inexpensive material.

As a result, the installation space for attaching the support column 22 to the revolving frame 5 can be reduced, so that the pattern switching valve 19 can be provided even in a narrow place. Further, by simplifying the structure of the support column 22, the front and rear support brackets 24, and the left and right support brackets 25, it is possible to secure a space around the control valve 16 and the like, thereby improving workability when performing inspection and maintenance. it can. Furthermore, since it is not necessary for the turning frame 5 to increase the strength of the control valve mounting plate 5F to which the support column 22 is attached, the structure of the turning frame 5 can be simplified.

Further, since the front / rear support bracket 24 is attached to the hydraulic oil tank 15 on the rear side, the pattern switching valve 19 can be fixed in the front and rear directions using the hydraulic oil tank 15. In this case, the force acting on the front plate 15A of the hydraulic oil tank 15 from the front / rear support bracket 24 can be only the force in the front and rear directions, so that a situation where the hydraulic oil tank 15 is damaged can be prevented. be able to.

Further, since the left and right support brackets 25 are attached to a partition plate 18 that partitions between the driver's seat 12 and the pattern switching valve 19, the pattern switching valve 19 is fixed to the left and right using the partition plate 18. Can do.

Further, since the front and rear support brackets 24 and the left and right support brackets 25 are formed as separate members, an attachment error (processing error) when attaching the front and rear support brackets 24 and the left and right support brackets 25 to the pattern switching valve 19 is increased. It can be adjusted separately, and the processing accuracy of the support column 22, the front and rear support brackets 24, and the left and right support brackets 25 can be relaxed. Further, since the front and rear support brackets 24 and the left and right support brackets 25 are fastened together with the pattern switching valve 19 using a common bolt 23, the mounting work can be simplified and the assembly workability can be improved.

In the embodiment, the case where the front and rear support brackets 24 and the left and right support brackets 25 are formed as separate members has been described as an example. However, the present invention is not limited to this. For example, the front and rear support brackets 24 and the left and right support brackets 25 may be integrally formed to support the pattern switching valve 19.

In the embodiment, the case where the present invention is applied to the hydraulic excavator 1 including the canopy 33 covering the upper side of the driver's seat 12 has been described as an example. However, the present invention is not limited to this, and may be applied to, for example, a hydraulic excavator including a cab box that covers the periphery of the driver's seat 12.

Furthermore, in the embodiment, the track-type hydraulic excavator 1 has been described as an example of the swivel construction machine. However, the present invention is not limited to this, and other swivel construction machines such as a wheel-type excavator, for example. It can also be applied to.

1 is a front view showing a canopy-spec hydraulic excavator applied to an embodiment of the present invention. It is a front view which expands and shows the upper revolving body in FIG. 1 in the state which opened the right cover. It is a top view which shows an upper revolving body in the state which removed the driver's seat, the exterior cover, the canopy, etc. It is a perspective view of the principal part expansion which shows the attachment state of a pattern switching valve. It is a disassembled perspective view which shows a pattern switching valve, a support | pillar, a front-back support bracket, and a left-right support bracket.

Explanation of symbols

1 Hydraulic excavator (swivel construction machine)
DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Upper revolving body 4 Working device 5 Turning frame 8 Engine 9 Hydraulic pump 12 Driver's seat 13 Work operation lever (operation device)
DESCRIPTION OF SYMBOLS 15 Hydraulic oil tank 15A Front plate 15B Rear surface plate 15C Left side surface plate 15D Right side surface plate 15E Upper surface plate 15F Bottom surface plate 16 Control valve 18 Partition plate 19 Pattern switching valve 20 Valve main body 21 Switching lever 22 Strut 23 Bolt 24 Front / rear support bracket 25 Left / right support bracket

Claims

A self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a work device that is provided on the front of the upper revolving body so as to be able to move up and down. Become
The upper swing body includes a swing frame, an engine that is mounted on the rear side of the swing frame and drives a hydraulic pump, a driver seat that is positioned on the front side of the engine and is provided on the swing frame and seated by an operator; An operating device provided in the vicinity of the driver's seat for operating the working device; a hydraulic oil tank located on the right side of the driver's seat and provided on the swivel frame for storing hydraulic oil supplied to the hydraulic pump; A control valve that is provided on the revolving frame and is located on the front side of the hydraulic oil tank, and supplies and discharges pressure oil to and from the working device according to the operation of the operating device, and between the hydraulic oil tank and the driver seat. In a swivel construction machine comprising a partition plate extending forward and partitioning the right side of the driver's seat, and a pattern switching valve for switching a combination pattern of the operation pattern of the operation device and the control valve ,
A column that is positioned on the front side of the hydraulic oil tank, extends up and down on the revolving frame, and is provided with the pattern switching valve mounted on the upper position, and supports the pattern switching valve in the front and rear directions. And a front / rear support bracket provided between the hydraulic oil tank and the pattern switching valve, and between the partition plate and the pattern switching valve for supporting the pattern switching valve in the left and right directions. A swivel construction machine comprising a left and right support bracket and configured to fix the pattern switching valve in three directions by the support columns, the front and rear support brackets, and the left and right support brackets.
2. The swivel construction according to claim 1, wherein the support column is erected to extend upward from the control valve, and the front and rear support brackets and the left and right support brackets support the pattern switching valve above the control valve. machine.