JP2000319936A - Work vehicle having movable cabin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide wide visibility by approaching a work place when a work position exists below a work vehicle and when the work position exists above the work vehicle by connecting a rotary connecting part of a stand rear part and a rotary connecting part of a column upper part by plural-stage frame- shaped booms. SOLUTION: A bracket 6 is erected on a rear part of a stand 5 for mounting/ supporting a cabin 4. The upper end of a rear stage boom 9c is connected to a connecting part of a column 7 upper part, and the lower end of a front stage boom 9a is connected to a rotary connecting part of the stand 5. A pair of lifting hydraulic cylinders 12 are arranged between a column lower part and the rear stage boom 9c. An attitude controlling hydraulic cylinder 15 is connected between a base part 16 of the front stage boom 9a and an upper connecting part 11 of the stand bracket to thereby make a forward movement so far impossible by a conventional machine to reduce a burden of an operator by approaching a work place with wide visibility to improve the working efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle that can move a driver's seat of a construction work vehicle such as a hydraulic shovel forward and upward of the work vehicle to obtain a wide work view according to a work situation.

[0002]

2. Description of the Related Art In order to increase the working visibility in the driver's seat,
A work vehicle that raises and lowers the driver's operation room (cabin) with respect to the turning base is known.However, in this method, the distance from the work place becomes longer as the cabin is raised to widen the view In addition, there is a drawback that the view near the foot of the work vehicle is rather narrowed because the cabin is kept horizontal.

[0003]

SUMMARY OF THE INVENTION The present invention is applicable to a case where a work position is below a work vehicle such as loading or unloading a bulk carrier that is berthing, and a case where the work position is above such as a structure dismantling work. Also provides a work vehicle that can approach the work location and obtain a wide field of view, and not only moves the cabin forward and upward from a fixed position with respect to the base, but also raises the cabin at a stop position of its movable range. It is intended to provide a work vehicle that can perform the work.
Further, the present invention provides a working vehicle in which the driver's seat is accommodated within the allowable range of regulations as a traveling vehicle, and is stably supported without swinging even when supported in the air.

[0004]

The work vehicle according to the present invention is provided with two pivotal connecting portions at the upper and lower portions of a rear portion of a gantry for mounting and supporting a cabin, and is erected on a pivot base of the work vehicle and is pivotally connected at an upper portion. A column having a portion and a rectangular frame having substantially the same shape are overlapped and slidably connected to each other, and a plurality of frame-shaped booms holding hydraulic cylinders extending the frames inside the frame are provided at the top of the column. A pair of lifting cylinders connected between a rotation connection portion and a lower rotation connection portion of the gantry, and connected to a bottom of the support and an intermediate portion of a last one of the plurality of frame-shaped booms; It is configured to include a posture control hydraulic cylinder between the base end side of the foremost boom of the stepped frame boom and the bracket upper connecting portion of the gantry, and the number of steps of the framed boom is configured to be two or three. A wide movable range can be obtained. In the above-described apparatus, as a means for slidingly connecting the frames, a slide guide in which a slide block with a ball retainer (manufactured by THK, Patent No. 2607993) is fitted to a thread-wound cross-section rail, or is further rotated. The stability of the cabin can be improved by making the connecting portion a swing-resistant mechanism. The cabin according to the present invention can be lowered in the raised position, and thus can work while directly viewing the work object with a wide field of view.

[0005]

FIG. 1 shows a case where frame-shaped booms are connected in three stages. In FIG. 1, 1 is a work vehicle, 2 is a turning base, 3 is a boom connecting an arm (not shown) to which a work attachment such as a shovel (not shown) is attached, and 4 is a cabin. 5 is a mount that supports and supports the cabin,
A bracket 6 is provided upright at the rear. Reference numeral 7 denotes a column that is erected and fixed on a base. Reference numeral 9 denotes a three-stage frame-shaped boom.
The upper end of c is connected to the connecting part 8 at the top of the support, and the front boom 9a
Is connected to the rotation connection part 10 of the gantry 5. Reference numeral 12 denotes a pair of hydraulic cylinders for raising and lowering provided between the lower part of the support and the rear boom 9c, and reference numerals 13 and 14 denote connecting portions. Reference numeral 15 denotes a hydraulic cylinder for controlling the attitude of the cabin connected between the base 16 of the front boom 9a and the upper connecting portion 11 of the gantry bracket. 3-stage boom 9
Is composed of three rectangular frames 17 of substantially the same shape. A mounting board 18b is provided on both upper sides of the middle boom 9b and the rear boom 9c.
18c is provided to support guide rails 19b and 19c, respectively. Guide blocks 20a and 20b are fixed symmetrically downward at the bottoms on both sides of the front boom 9a and the intermediate boom 9c, and are fitted to grip the guide rails 19b and 19c, respectively. These guide blocks are sliding guides in which a bearing with a retainer is provided and have little friction and no play.

[0006] In Fig. 5, reference numerals 21 and 25 denote hydraulic cylinders for extending and retracting the frame body disposed vertically above and below the center of the frame 17 of the intermediate boom 9b in the longitudinal direction. twenty three,
27 is a rod, 24 is a front boom bracket, and 28 is a rear boom bracket. Reference numerals 29a and 29b denote recesses provided in the upper and lower portions of the center of the front wall and the rear wall of the intermediate boom 9b, respectively, and serve as passage portions for the cylinder rod and the bracket.

FIG. 9 shows ports A and B of the hydraulic cylinder 15 for attitude control.
Is connected. Reference numeral 30 denotes a battery mounted on the vehicle, 31 denotes an automatic / manual changeover switch, and 32 denotes a cabin elevation manual switch, which always returns to a neutral position. Numeral 33 denotes a cabin attitude detecting means, of which a gravity type is used in the figure. The oscillator 33a contacts one of the contacts depending on the angle of the cabin, and operates the electromagnetic switching valve.
Reference numeral 35 denotes a check valve for preventing vacuum generation in the cylinder. The posture detecting means 33 can be freely attached to the inside and outside of the cabin.

[0008] The number of steps of the frame-shaped boom is not limited to the above-mentioned three steps, but can be constituted by two steps. However, in any case, the number of telescopic cylinders can be arbitrarily set. By employing the connection mechanism of FIG. 10 for the rotation connection portion, it is possible to reduce the rotation and sway between the frame-shaped booms and the cabin. That is, an outer sleeve 41 is fixed to both ends of one connecting member 40, and an inner sleeve 43 having a thrust radial bearing 44 therein is fixed to the other connecting member 42, and the two sleeves are joined to form a bearing.
The tip of the preload pin shaft 45 is fitted into the inner race 44 and the rear portion of the pin shaft is brought into contact with the end plate 46 and pressed by the bolt 48 via the shim 47. The pressing force is adjusted by the shim. 49 is a grease chamber, 50 is a closing plate, 51 is an O-ring, and 52 is a grease nipple.

[0009]

According to the present invention, the hydraulic cylinders 12, 15, 21, 2
5 is operated in the cabin, and the operator can work by adjusting the position and posture of the cabin according to the work situation of the attachment. In particular, since it is possible to move forward, which is impossible with the conventional machine, it is possible to approach the work place with a wide field of view, thereby reducing the burden on the operator and improving the work efficiency.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a working vehicle provided with a three-stage boom.

FIG. 2 is a side view of a main part of the working vehicle in which a cabin is in an ascending position.

FIG. 3 is a side view of a main part when the multi-stage boom is extended.

FIG. 4 is a plan view of a gantry and a front boom from which a cabin has been removed.

FIG. 5 is an essential part cross-sectional view of the intermediate boom in an extended state.

FIG. 6 is an essential part cross-sectional view showing a slide mechanism of the multistage boom.

FIG. 7 is a plan view of the same.

FIG. 8 is a longitudinal sectional front view of a main part in a retracted state of the multistage boom.

FIG. 9 is a hydraulic and electrical circuit diagram of a posture control hydraulic cylinder.

FIG. 10 is an end sectional view of a connection pivot.

[Explanation of symbols]

 2 Swivel base 3 Boom 4 Cabin 5 Stand 6 Bracket 7 Support column 8 Connecting section 9 3-stage frame-shaped boom 10 Connecting section 11 Upper connecting section 12 Lifting hydraulic cylinder 15 Attitude control hydraulic cylinder 17 Square frame 18 Mounting board 19 Guide Rail 20 Guide block 21, 25 Extending / retracting cylinder 31 Automatic / manual changeover switch 32 Elevation angle manual switch 33 Cabin attitude detection means 33a Oscillator 34 Solenoid changeover valve 35 Check valve

Claims (3)

[Claims] 1. The upper and lower sides of the rear of the gantry for mounting and supporting the cabin
A column having a rotating connection portion at a location and a column having a rotating connection portion on the upper portion which is erected on the turning base of the work vehicle, a substantially same rectangular frame is overlapped and slidably connected to each other,
A plurality of frame-like booms holding hydraulic cylinders extending between the frame members inside the frame member are connected between an upper rotation connection portion of the support and a lower rotation connection portion of the gantry, and a bottom portion of the support is provided. And a pair of lifting / lowering cylinders connected in the middle of the last stage boom of the multiple stage frame-shaped boom, between the base end side of the foremost stage boom of the multiple stage frame-shaped boom and the bracket upper connection portion of the gantry. A work vehicle equipped with a movable cabin provided with a hydraulic cylinder for attitude control. 2. A frame-shaped boom is composed of three stages, and adjacent booms are slidably connected to each other by a slide rail provided in the same direction and a guide block fitted to the slide rail. 2. The work vehicle according to claim 1, wherein a pair of hydraulic cylinders whose operating directions are opposed to each other are provided, and their bottom sides are pin-connected, and the respective cylinder rods are pin-connected to the front and rear booms. 3. An electromagnetic switching valve that operates between a port A and a port B of a hydraulic cylinder for posture control by a signal from a cabin posture detecting means to automatically control the cabin posture or to manually control the elevation angle of the cabin. Claim 1 or 2 connected
The working vehicle described.