JPH0762685A - Arrangement structure of service port of back hoe - Google Patents

Abstract

PURPOSE:To improve both workability of excavation work and service work by lateral side-face arrangement on the maneuvering section side obtained by abandoning a fixed idea, in which a service port is disposed on the front of a swivel base, while deliberating the form of service work. CONSTITUTION:A boom is arranged to the left and right intermediate section of the front section of a swivel base 4 in a rocking lifting-lowering-able manner, and a tank section is disposed to the right side of the boom and a maneuvering section to the left side respectively while a freely opening-closing cover 25 is mounted on a lateral external side face on the maneuvering section side of the swivel base 4. A pair of service ports 22a, 22b and the changeover lever 23 of a control valve Sv for service are arranged inside the cover 25. The cover 25 is not closed by an interfere in a lever front end 23b in the operation attitude of the changeover lever 23, in which the control valve Sv for service is changed over at an operation position U.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to the placement of service ports on a backhoe.

[0002]

2. Description of the Related Art A backhoe is provided with a service port for driving a hydraulic equipment for work such as a hand breaker by using its hydraulic circuit, in addition to an excavation work device. A boom is arranged in the middle of the front part of the swivel base so as to be capable of swinging up and down, and a tank part is arranged on one side of the boom and a control part is arranged on the other side of the boom. In Japanese Patent No. 25840), a service port is arranged on the front side wall of the swivel base beside the boom mounting portion, such as at the front position of the control portion.

[0003]

In the above structure, there is no particular problem when only service work such as connecting a hand breaker to the service port is performed.
When performing service work even during excavation work in order to work efficiently, the hydraulic hose for service taken out from the swivel base in the forward direction is likely to interfere with excavation work, and may interfere with the contact of the hydraulic hose. It becomes work while using it. Especially, in the case of a small backhoe, the boom and the service port are close to each other, so that the above characteristics become remarkable. An object of the present invention is to reduce the risk of interference between the excavation work device and the service hydraulic hose by devising the arrangement of the service port.

[0004]

In order to achieve the above-mentioned object, the present invention arranges a boom in a swingable ascending / descending manner at a left / right intermediate portion of a front portion of a swivel base, and a tank portion on one side of the boom. The control parts are arranged on the other side, and a cover that can be opened and closed is provided on the lateral outer surface on the control part side of the swivel base.The service port and the control valve for this service port are provided inside the cover in the closed state. And an operating tool that can be switched over are arranged.

[0005]

That is, since the service port is provided on the lateral side of the swivel base, a large gap is formed between the boom mounting portion and the service port for excavation work and service for simultaneous excavation work and service work. The risk of interference with the hydraulic hose is dramatically reduced. Therefore, it becomes easy to rotate the revolving base to some extent during the simultaneous work, and the simultaneous workability also improves. Since the switching operation tool for the control valve for the service port is arranged together with the service port, the operation for connecting the hydraulic hose to the service port and the operation for supplying the hydraulic pressure can be performed at the same place. And when not in use, it can be stored in the cover,
Dust and mud do not adhere to the service port and the appearance is not deteriorated.

Further, for example, when the service port is provided on the side surface on the tank side or the rear surface on the rear of the swivel base, the service port cannot be visually recognized from the control section because it is blocked by the tank section or the engine bonnet. Since it is provided on the side surface of the side, it is easy to attach and detach the hose at the service port and confirm it, which is convenient for preparatory work during service work, inspection, and maintenance.

[0007]

As a result, by arranging the service port in the cover provided on the lateral side of the control unit side, which was obtained by carefully considering the service work mode, the excavation work while maintaining the good appearance of the swivel base. Thus, a useful backhoe that can improve the workability of both service work and preparatory work can be provided.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. An ultra-small turning type backhoe is shown in FIG. 1, where A is an excavation work device, 4 is a swivel base, 5 is a traveling platform, and 6 is a crawler traveling device. The excavation work apparatus A is configured to include a boom 1, an arm 2 and a bucket 3. The boom 1 is laterally laterally bendable and displaceable, and the bucket 3 is in a storage posture in which the boom 3 is located on the right side. it can.

As shown in FIG. 2, in the front part of the swivel base 4,
A control part 7, a connecting part 8 of the excavation work device A, and a tank part 9 are arranged from the left, and a driving part B extending to the left and right is provided behind the swivel base 4.
Is provided. As shown in FIGS. 1 to 3, a tank 9 is provided with a hydraulic oil tank 10 and a fuel tank 11, and a prime mover B has an engine E, a radiator 12,
The hydraulic pump group 13 and the like are arranged.

The bonnet structure has a rear bonnet 15 having a cockpit 14 and a side bonnet 16 integrally covering the rear portion of the tank portion 9 and the tank portion 9 in the driving portion B.
It consists of and. The side bonnet 16 is composed of a smooth curved surface, and a relatively steep forward inclination is attached to the tank portion 9 so that earth and sand may slide down. As the material, in addition to sheet metal, a resin material or a composite material such as FRP containing glass or carbon fiber may be used. Further, in order to prevent resonance of the side bonnet 16 that causes noise, a structure may be adopted in which rubber is attached to the inner surface or ribs are integrally formed to increase rigidity.

As shown in FIG. 3, the floor 17 of the control unit 7
The work control valve V group for the excavation work device arranged below, the hydraulic pumps P _{1 to} P ₃ (hydraulic pump group 13) attached to the engine E, and the hydraulic oil tank 10 are the four hydraulic hoses 1.
The pipe is 8 to 21. That is, the first and second pumps P ₁ and P ₂ and the first and second supply hoses 18 and 19 are for the work control valve V, and the third pump P ₃ and the third hose 20.
Is for a pilot valve (not shown) for pilot operation, and is provided with a single return hose 21 that joins the work control valve V and the drain passage of the pilot valve.

The service port 2 for taking out pressure oil supply / discharge from the service control valve Sv of the control valves V to the outside.
No. 2 is provided so as to face the left lateral outer surface of the swivel base 4 located immediately beside the service control valve Sv, and a manual lever (operated by an operating tool) for switching the valve position in conjunction with the spool. (Corresponding) 23 is arranged after the service port 22. Therefore, the service hydraulic hose 24 such as a hand breaker is taken out toward the left side, and the excavation work equipment A
First, there is no risk of interference with the service hose 24.

Next, the service port 22 and the manual lever 2
The arrangement structure of No. 3 will be described in more detail. Figure 4-
As shown in FIG. 7, a cover 25 is provided on the left side surface of the swivel base 4 so as to be openable and closable at the upper and lower fulcrums X, and the service port 22 and the service control valve Sv are provided inside the cover 25 in the closed state. Manual lever 2 that can be switched
3 and 3 are arranged. The service port 22 is a bracket in which a pair of delivery ports 22a and 22b are vertically arranged with a slight difference in front and back, and an upper port mounting bracket 26 and a lower port mounting bracket 27 are bolted to a swivel frame 29. It is attached to 28.

The service control valve Sv is a three-position switching valve, but here it is used as a two-position switching valve of the neutral position N and the working position U, and a switching mechanism 30 for switching the two positions is provided. . That is, the plate portion 23a of the manual lever 23 is pivotally supported on the spool 31, and the plate portion 23a
a and the arm 32 pivotally attached to the bracket 28 at the lateral fulcrum Y
When the spool 31 is in the neutral position N, the lever portion 23b is urged by the structure in which the spool 31 is pivotally connected and the spool 31 is urged to return to the neutral position N retracted from the projecting work position U. When the retracted posture is located inside the cover 25 and the spool 31 is in the working position U, the lever portion 23 is located.
A switching mechanism 30 having a dead point structure for maintaining the urging of the manual lever 23 is configured in an operating posture in which b is lowered and protrudes from the cover 25 in the closed state.

The cover 25 can be held in a position opened upward by a waist bending link mechanism 35 composed of a first link 33 and a second link 34, and can also be held in a closed position by a spring piece 36. As described above, the manual lever 23 in the operating posture is set so that the tip of the manual lever 23 projects outside the closed cover 25.
The cover 25 cannot be closed while the service control valve Sv is switched.

As shown in FIGS. 1 and 2, the canopy 37
Is formed by attaching a side wall 39 and a top plate 40 to a support frame 38 fixed to the swivel frame 29. As shown in FIG. 8, the support frame 38 made of a round pipe is configured by connecting and integrating a pair of front and rear vertical pipe portions 38a, 38a and a U-shaped ceiling pipe portion 38b. FIG. 9 shows a cross-sectional view of a connecting portion between the vertical pipe portion 38a and the ceiling pipe portion 38b. The connecting cylindrical member 41 previously welded to the thin-walled ceiling pipe portion 38b is provided with a thick and long outer diameter. By welding the pipe portion 38a around the entire circumference, the support frame 38 having sufficient strength and being lightweight is configured.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 Side view of ultra-small turning backhoe

FIG. 2 is a front view of a swivel base portion.

FIG. 3 is a partially cutaway plan view showing the structure of a swivel base.

FIG. 4 is a rear view showing the structure of the service port portion.

FIG. 5 is a rear view showing the cover opening / closing structure.

FIG. 6 is a plan view showing the structure of a service port portion.

FIG. 7 is a side view showing the structure of the service port portion.

FIG. 8 is a perspective view showing a frame of a canopy.

FIG. 9 is a sectional view showing the connection structure of the nopy frame.

[Explanation of symbols]

 1 boom 4 swivel base 7 control part 9 tank part 22 service port 23 operation tool 25 cover Sv service control valve

Claims (1)

[Claims] 1. A boom (1) is swingably moved up and down at an intermediate portion on the left and right sides of a front part of a swivel base (4), and a tank portion (9) is provided on one side of the boom (1) and a side portion on the other side thereof. The control parts (7) are arranged on the respective sides, and an openable / closable cover (25) is provided on the lateral outer surface on the control part side of the swivel base (4), and an inner part of the cover (25) in the closed state is provided. , Service port (22) and this service port (22)
A service port arrangement structure of a backhoe in which a control valve (Sv) for use with the operation tool (23) which can be freely operated is arranged.