JPH11100863A - Valve fitting frame for turning working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce work manhours in a revolving super structure manufacturing line by fitting a valve unit, pilot valves and an operation bracket for supporting the pilot valves, in one lot to a revolving frame. SOLUTION: In a turning working machine, a revolving frame 8 is provided on a travel device rotatably around a vertical axis, and the revolving frame 8 is mounted with a valve unit 24 with a plurality of control valves connected in a group so as to control various hydraulic equipments, pilot valves 42 applying pilot pressure to the control valves of the valve unit 24, and an operation bracket 43 for supporting the pilot valves 42. In this case, a base 45 is provided to fit the valve unit 24 to the revolving frame 8, and the operation bracket 43 is connected to the base 45.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art For example, in a small-turn turning work machine in which the rear side surface of the revolving unit does not protrude from the vehicle width of the traveling device, it is necessary to fit the rear part of the revolving unit into a circle having a vehicle width in diameter. Various devices inside and outside must be efficiently arranged in a narrow place. Therefore, in the conventional small-swing turning machine,
A valve unit having a plurality of control valves for controlling various hydraulic devices mounted in a group, in which an engine is mounted laterally on a rear portion of a turning frame provided rotatably about a vertical axis on a traveling device, A pilot valve that applies pilot pressure to a control valve of the valve unit and a steering bracket that supports the pilot valve are mounted on a front portion of the turning frame (for example,
See JP-A-9-60041).

[0003]

Generally, a revolving structure of the revolving work machine is manufactured by a worker or a working robot sequentially attaching the engine, the valve unit and the like to a revolving frame flowing in a fixed direction on a production line. You.
Conventionally, however, despite the fact that both the valve unit and the pilot valve control bracket are mounted on the front of the turning frame, the valve unit and the control bracket are individually mounted on the base plate of the turning frame. The time required to install the revolving superstructure on the production line.

Further, since the valve unit and the pilot valve need to be connected by a large number of hydraulic pipes, if they are separately mounted on the revolving frame, after they are mounted on the revolving frame, the hydraulic pressure between them is increased. The connection of the piping had to be performed on the revolving unit manufacturing line, and in this respect, the number of working steps on the revolving unit manufacturing line was increased.

The present invention has been made in view of the above circumstances, and has been made so that a valve unit, a pilot valve and a control bracket for supporting the valve unit can be integrated into one and attached to a revolving frame. The purpose is to reduce man-hours.

[0006]

In order to achieve the above object,
The present invention has taken the following technical measures. That is, the present invention provides a valve in which a turning frame is provided on a traveling device so as to be rotatable around a vertical axis, and a plurality of control valves for controlling various hydraulic devices are connected to the turning frame in a group. A unit for mounting the valve unit to the revolving frame in a turning work machine equipped with a unit, a pilot valve for applying a pilot pressure to the control valve of the valve unit, and a control bracket for supporting the pilot valve. A base is provided, and the steering bracket is connected to the base.

In this case, if the steering bracket having the pilot valve is previously mounted on the base having the valve unit, the base is mounted on the revolving frame in the revolving body manufacturing line, and the valve unit is mounted on the revolving frame. At the same time, the pilot valve and its control bracket can be attached, and the number of man-hours required in the revolving body manufacturing line can be reduced.

Further, if the valve unit integrated with the pilot valve and the pilot valve are connected in advance by a hydraulic pipe outside the production line, it is not necessary to perform the connection work on the revolving body production line. The number of man-hours in the production line can be further reduced. In the present invention described above, it is preferable that the base further includes a mounting portion for a direction switching valve for switching a supply direction of the pilot hydraulic oil and a mounting portion for a line filter for the pilot valve.

In this case, if the directional control valve and the line filter are mounted on the base in advance, the directional control valve and the line filter can be mounted on the revolving body manufacturing line only by mounting the base on the revolving frame. As a result, it is possible to further reduce the number of working steps in the revolving body manufacturing line.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The drawing shows a small turning backhoe 1 exemplified as a turning work machine. In FIG. 5, the backhoe 1 is mainly composed of a traveling device 2, a revolving unit 3, and an excavating device 4.

Hereinafter, the traveling direction of the backhoe 1 (the left-right direction in FIG. 5) is referred to as the front-rear direction, and the lateral direction orthogonal to the front-rear direction (the direction penetrating the paper in FIG. 5) is referred to as the left-right direction.
As shown in FIG. 5, the traveling device 2 employs a crawler traveling device in which a pair of left and right crawler traveling members 5 having rubber crawler belts are provided, and these traveling members 5 are driven by a traveling motor M. . A dozer 6 is provided at the front of the traveling device 2.
Is provided.

The revolving frame 3 is supported by a bearing 7 provided at the center between the left and right crawler traveling bodies 5 of the traveling device 2 so as to be rotatable around a vertical axis X. The hood 9 includes a hood 9 that covers various devices mounted on the revolving frame 8, and a cabin 12 that covers a seat 10 provided on the hood 9 and a control unit 11 in front of the hood 9. The revolving frame 8 is configured by covering the outer periphery of a base plate 13 on which the mounting brackets of various devices are erected on the upper surface with a cover member 13A made of FRP, and fixed to the base plate 13 at the rear of the revolving frame 8 and A counterweight 9A is provided to balance the weight of the revolving frame 8 with the excavator 4 at the front. The turning frame 8 is turned around a turning axis X by a turning motor 14 (see FIG. 4) provided on the base plate 13.

The backhoe 1 is of the so-called small backward turning type, and is formed in an arc shape so that the rear side surface of the revolving unit 3 does not protrude from the vehicle width of the traveling device 2. That is, when the revolving unit 3 turns, the turning trajectory drawn by the rear surface of the revolving unit 3 falls within the left and right widths of the left and right crawler traveling units 5. As shown in FIG. 4, the left and right side surfaces of the revolving unit 3 are formed in a plane along the front-rear direction with the revolving unit 3 facing forward, and the interval between the left and right side surfaces is drawn by the rear surface of the revolving unit 3. It is formed narrower than the diameter of the turning locus circle. Furthermore, in the same state, the front surface of the revolving unit 3 is formed in a plane along the left-right direction.

As shown in FIGS. 4 and 5, a pair of upper and lower pivotal support members 15 for supporting the excavator 4 project from the right side of the front surface of the turning frame 8. A swing bracket 16 is pivotally attached to the pivotal support member 15 via a support shaft so as to be swingable left and right around a vertical axis. The swing bracket 16 is provided by a swing cylinder (not shown) provided inside the turning frame 8. Rocked.

The excavator 4 has a boom 1 whose base is pivotally attached to a swing bracket 16 so as to be swingable about the left and right axes.
7, an arm 18 pivotally attached to the distal end side of the boom 17 so as to be swingable about the left and right axes, and a bucket 19 attached to the distal end side of the arm 18 so as to be free to squeeze and dump. The boom 17 is swung by a boom cylinder 17 provided between the swing bracket 16 and the middle part of the boom 17, and the arm 18 is connected to an arm cylinder 21 provided between the middle part of the boom 17 and the base of the arm 18. The bucket 19 is swung and dumped by the bucket cylinder 22 provided between the base of the arm 18 and the mounting link of the bucket 19.

As shown in FIG. 4, the steering section 11 is erected at the front end of the turning frame 8, and the left side of the front half of the turning frame 8 is covered with a floor sheet. A valve unit 24 in which a plurality of control valves C1, C2,... For controlling various hydraulic devices are connected in a group in a series state is housed. On the other hand, the rear upper surface and the right upper surface of the revolving frame 8 are open upward,
These open portions are covered with the rounded bonnet 9 projecting upward from the upper surface of the revolving frame 8.

Inside the bonnet 9, an engine 26 for driving a hydraulic pump 25 for supplying pressure oil to the valve unit 24, a fuel tank 27 for supplying fuel to the engine 26, and a hydraulic pump 25 A hydraulic oil tank 28 for supplying oil, a radiator 29 for water-cooling the engine 26, and the like are housed, all of which are mounted on the turning frame 8.

As shown in FIG. 4, the engine 26 is disposed laterally at the rear of the revolving frame 8 such that the drive axis thereof is directed to the left and right. A hydraulic pump 25 is directly connected to a lower left portion of the engine 26, and a radiator fan 30 is connected to an upper right portion of the engine 26. The lower shaft that drives the hydraulic pump 25 and the upper shaft that drives the radiator fan 30 are linked by a belt transmission mechanism including a fan belt 31 and a pulley.

On the right side of the radiator fan 30, an oil cooler (not shown) and a radiator 29 are arranged in that order, and an outside air intake is formed on the right side of the bonnet 9 corresponding to these heat exchangers. ing. In addition, a swivel joint 32 is provided at the turning center of the turning frame 8.
The swing motor 14 is disposed on the right side of the joint 32 and slightly forward of the joint 32. These members are connected to the valve unit 24 by hydraulic piping.

The hydraulic oil tank 28 is disposed in front of a radiator 29, and the fuel tank 27 is
8, both tanks 27,
Numerals 28 are arranged adjacent to each other on the right front portion of the revolving frame 8. The lower portion of the hydraulic oil tank 27 is fixed to a support bracket (not shown) erected from the base plate 13 of the revolving frame 8, and the left side thereof is disposed on the front right side of the revolving frame 8 in the front-rear direction. It is fixed to the support plate 33.

On the other hand, the fuel tank 27 is fixed to both ends of a mounting band (not shown) wound around the outer peripheral portion thereof to the hydraulic oil tank 28 side so that the hydraulic oil tank 28
It is fixed to the front side of the car in a suspended state. As shown in FIG. 4, a bonnet frame 34 formed substantially in a gate shape in a front view so as to straddle the engine 26 largely in the left-right direction is provided upright on the turning frame 8. 9 functions as a frame member.

The bonnet frame 34 is composed of a pair of front and rear left supports 3 erected on the rear left side of the turning frame 8.
5, 36, a central support 37 erected in the center of the rear part of the frame 8, a side frame 38 erected from the right side of the frame 8 to the rear to the front, and a side frame 38 Said support plate 33 fixed in 38;
And a rear cross beam 39 erected from the upper end of the rear left column 36 to the rear end of the side frame 38 through the upper end of the central column 37.

The front and rear left supports 35 and 36 are connected to each other by a connection plate 40 which also functions as a battery mounting table. A seat 10 is provided between the front left support 35 and the support plate 33. The front cross beam 41 for supporting from below is installed. As shown in FIG.
On the front left side of the revolving frame 8, the valve unit 2
4 and a pilot valve 42 provided in the control section 11.
A valve mounting frame 44 for mounting the steering bracket 43 supporting the valve 42 together with the turning frame 8 is provided.

As shown in FIGS. 1 to 3, the valve mounting frame 44 is provided on the base plate 1 of the turning frame 8.
3, a flat base 45 that can be mounted on the base 3, a mounting base 46 erected on the front end of the base 45, and the steering bracket 43 erected on the mounting base 46, The valve unit 24 is fixed on the upper surface of the base 45 slightly leftward in the front-rear direction.

The mounting base 46 of the mounting frame 44 includes the base 4
5 is provided with three legs 47 erected at the front end and a mounting plate 48 connecting the upper ends of the legs 47, and the steering bracket 43 is erected on the upper surface of the mounting plate 48. ing. The steering bracket 43 includes a pair of left and right support columns 49 that extend straight upward from the mounting plate 48.
A pair of left and right side walls 50 extending upward and leftward from the mounting plate 48, and an upper plate 51 connecting the upper ends of the side walls 50 and the support columns 49 to each other.
And

The upper plate 5 of the steering bracket 43
1 is formed in a substantially U-shape with its rear open in plan view, and the upper edge of the upper plate 51 is closed by an upper lid plate 52. The pilot valves 42 are fixed to the left and right lower surfaces of the upper cover plate 52, respectively, and the four operation spools of the pilot valves 42 are pushed and operated on the upper left and right upper surfaces of the upper cover plate 52. Are provided so as to be able to swing back and forth and left and right.

The left and right pilot valves 42 are connected to pilot ports of a swing motor control valve C1, a boom control valve C2, an arm control valve C3, and a bucket control valve C4 of the valve unit 24, respectively. They are connected via piping, respectively, and are connected via hydraulic piping to a direction switching valve 54 described later.

Inside the upper plate 51 of the steering bracket 43, a pair of left and right traveling levers 55 for operating the left and right traveling motors M of the traveling device 2 are pivotally mounted to swing back and forth. The upper end of an interlocking rod 56 is connected to the traveling lever 55. This interlocking rod 56
The lower end is connected to a rotating shaft 57 that extends in the front-rear direction at the right end of the upper surface of the base 45 and extends downward in the steering bracket 43 and the mounting base 46.

The rotating shaft 57 is connected to the operation spools of the control valves C5 and C6 for the traveling motor M of the valve unit 24 via an interlocking bar 58 so that the traveling lever 55 can be moved forward and backward. By swinging, the rotation direction and rotation speed of the traveling motor M can be operated. In this embodiment, a mounting bracket (mounting portion) 59 of the direction switching valve 54 for switching the pilot hydraulic oil to a direction other than the pilot valve 42 is fixed to a front portion of the left end edge of the base 45. Base 45
A mounting bracket (mounting portion) 61 of a line filter 60 for the pilot valve 24 is fixed to the rear portion of the left end of the line.

The inflow side of the line filter 60 is connected to a pilot sub-pump (not shown) via a hydraulic pipe, and the outflow side is connected to the direction switching valve 54 via a hydraulic pipe. In addition, the direction switching valve 54
Is for selectively switching the supply direction of the pilot hydraulic oil from the line filter 60 to the pilot valve 24 or another pilot valve (for example, a pilot valve of a traveling motor of a traveling two-speed switching type).

For this reason, in this embodiment, the directional control valve 5
4 is connected to the pilot valve 24 via a hydraulic pipe and via the hydraulic pipe and the swivel joint 32 to the traveling motor M having a pilot valve for switching speed inside. . The outer peripheral portion of the steering bracket 43 is covered with a cover body 62 made of FRP or the like which constitutes an outer skin portion of the steering section 11. In addition, a speed switching pedal 63 for operating the direction switching valve 54 to switch the speed of the traveling motor M to the second speed side is provided above the mounting base 46.

According to the valve mounting frame 44 described above, the steering bracket 43 supporting the pilot valve 42 is connected to the base 45 for mounting the valve unit 24 to the turning frame 13 via the mounting base 46, and
The direction switching valve 54 and the line filter 6 are mounted on the same base 45.
0, the valve unit 24, the pilot valve 42, the steering bracket 43 supporting the valve unit 24, the direction switching valve 54, and the line filter 60 can all be integrated into one and attached to the turning frame 8 at once. The number of man-hours in the production line for the body 3 can be greatly reduced.

Further, since the valve unit 24, the pilot valve 42, the direction switching valve 54 and the line filter 60 are all integrated on one base 45, the piping connection of these valves is changed to the revolving unit 3. Can be performed outside the production line, whereby the number of work steps on the same line can be further reduced. The bonnet 9 is made of a resin or a thin steel plate, and is fixed to the bonnet frame 34 at various points on the inner surface side. The bonnet 9 includes a fuel tank 27 and a hydraulic oil tank 28.
A right cover portion 64 that covers the radiator 29 and the like, a rear cover portion 65 that covers the engine 26 from behind, a hydraulic pump 2
And a left cover portion 66 covering the fourth and the like.

Of these covers 64, 65 and 66, the rear cover 65 is supported by the rear cross beam 39 via hinges so as to be vertically rotatable. When the rear cover 65 is opened, the engine is opened. 26 and its surroundings can be maintained and inspected. In the present embodiment, the case where the present invention is applied to the backhoe 1 having a small backward turning is exemplified.
The present invention can be applied to a larger standard backhoe or an ultra-small turning backhoe in which the excavator 4 does not protrude from the turning locus of the revolving unit 3 when the excavator 4 is moved up.

[0035]

As described above, according to the present invention,
Since the steering bracket supporting the pilot valve is connected to the base for attaching the valve unit to the revolving frame, the valve unit, the pilot valve and the steering bracket supporting the same are collectively attached to the revolving frame. Therefore, the number of man-hours required for the revolving superstructure production line can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a valve mounting frame.

FIG. 2 is a left side view of the frame.

FIG. 3 is a front view of the frame.

FIG. 4 is a plan view showing the internal structure of the rotating body.

FIG. 5 is an overall side view of a small turning backhoe (turning work machine).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Small turning backhoe (turning work machine) 2 Traveling device 8 Turning frame 24 Valve unit 42 Pilot valve 43 Steering bracket 44 Valve mounting frame 45 Base 54 Direction switching valve 59 Mounting bracket (mounting part) 60 Line filter 61 Mounting bracket ( Mounting part) C1 control valve C2 control valve C3 control valve C4 control valve C5 control valve C6 control valve

Claims (2)

[Claims] 1. A revolving frame (8) on a traveling device (2).
Are provided so as to be rotatable about a vertical axis, and a plurality of control valves (C1, C2,...) For controlling various hydraulic devices are connected to the revolving frame (8) in a group. Unit (24) and this valve unit (24)
A pilot valve (42) for applying a pilot pressure to the control valves (C1, C2,...), And a steering bracket (43) for supporting the pilot valve (42)
In the turning work machine on which the turning unit (24) is mounted, the valve unit (24) is connected to the turning frame (8).
A base (45) for attaching the steering bracket (43) to the base (45). The base (45) further includes a mounting portion (59) of a direction switching valve (54) for switching a supply direction of the pilot hydraulic oil, and a line filter (60) for the pilot valve (42). The mounting frame (6) according to claim 1, further comprising a mounting portion (61).