JPH0444558Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to an inclination correction structure for a swivel base in an aerial work vehicle.

(b) Conventional technology Conventionally, the working equipment of an aerial work vehicle, such as a ladder for a ladder vehicle, has its base end mounted on a swivel base provided on the vehicle body frame so as to be able to rise and fall freely, and is extended in a desired direction by the swivel base. I'm trying to do that.

Moreover, in order to ensure work safety, such a swivel base is designed so that the ladder can be raised and lowered within a vertical plane, and the tilt of the swivel base can be corrected even when the vehicle body is installed on a slope. ing.

That is, as described in Japanese Patent Application Laid-open No. 118600/1983, the tilt correction structure of such a swivel base is such that two swash plate-shaped parts are installed between the swivel base on which the working machine is attached and the vehicle body frame. By rotating the two wheels by a predetermined angle using a superimposed ring, the rotating platform can be attached to the vehicle body frame depending on the relative angle of the overlap of the two wheels and the direction of the two overlapping wheels. The rotating table is tilted horizontally by giving it a predetermined inclination and direction.

(c) Problems to be solved by the invention However, in the case of the tilt correction structure of the swivel table, if the two swash plate-like rings do not overlap with precision, problems will occur with the relative angle etc. In order to prevent the present invention from functioning properly, a high degree of processing precision was required to overlap these two rings, and furthermore, the tilt correction operation required time and skill.

(d) Means for solving the problem Therefore, in the present invention, a fixed ring fixed to the vehicle body frame, a first ring rotatably fitted and supported within the fixed ring, and a first ring that faces 180 degrees on the outer peripheral surface. A second ring is rotatably supported within the first ring via a pivot pin protruding from a position, and a working device such as a folding ladder is rotatably fitted and supported on the second ring. The mounted swivel table, the swivel table and the first
A rotary drive unit that rotationally displaces the second ring relative to the second ring is inserted between the first ring and the second ring at a substantially symmetrical position about the swing center line connecting the pivot pin of the second ring. The first and second inclination correction cylinders provided, the rotation stopper that prevents the swivel base from rotating with respect to the vehicle body floor, the fixing ring, and the first
A high place comprising a fixing part that integrally fixes the ring, and a tilt sensor provided on the swivel base to detect the tilt state of the swivel base and operate the rotation drive unit and the first and second tilt correction cylinders. It is an object of the present invention to provide a structure for correcting the inclination of a swivel base in a work vehicle.

(E) Action When performing work with an aerial work vehicle parked on a slope, etc., perform the following operations to ensure that the swivel platform on which the work equipment, such as a folding ladder, is mounted is in a horizontal state. First, by retracting the fixing pin and releasing the fixation of the first ring, the first ring can be freely rotated with respect to the fixing ring, and the swivel base is also prevented from rotating by the rotation stopper. , the inclination sensor detects the inclination state of the swivel base, and the rotary drive unit moves the first ring and the second ring to the imaginary line connecting the highest point and the lowest point of the swivel base. Rotate until the swing center lines connecting the pivot pins are orthogonal.

In the same state, the first and second tilt correction cylinders are located on the ascending side and descending side of the swivel table, respectively.

Next, the rotation of the swivel base by the rotation stopper is released, the inclination sensor detects the inclination state of the swivel base, and the first and second tilt correction cylinders are positioned on the descending side until the swivel base is in a horizontal state. At the same time, one of the cylinders is operated to extend, and the other tilt correction cylinder located on the rising side is operated to shorten.

(f) Effects According to the present invention, since the inclination correction is not performed using the relative angle of the overlap of two rings as in the conventional method, the structure is simplified and the manufacturing cost can be reduced. There is.

Moreover, the tilt correction operation of the swivel base is performed by positioning the first and second tilt correction cylinders on the highest and lowest sides of the swivel base according to the detection results of the tilt sensor, and the tilt sensor rotates both cylinders. Since this can be done simply by extending and retracting until the horizontal state of the table is detected, there is an advantage that the inclination of the swivel table can be reliably corrected without requiring any skill in operation.

(G) Example The example of the present invention will be explained in detail based on the drawings.
A shown in Fig. 1 is a fire engine with a folding ladder for use as an aerial work vehicle. 1 is a body frame, 2 is a driving section installed at the front of the body frame 1, and 3 is a fire engine installed at the rear of the body frame 1. The swivel base 4 is a folding ladder attached to the swivel base 3 so that it can be raised and lowered freely, and 5 and 6 are front and rear wheels.

Further, 7 is a ladder support base, 8 is a undulation cylinder for undulating the folding ladder 4, 9 is an outrigger, and 10
is a ladder receiver.

A swivel table inclination correction mechanism 11 is interposed between the swivel table 3 and the vehicle body frame 1, and the swivel table inclination correction mechanism 11 rotates the swivel table 3 within a horizontal plane regardless of the inclination of the vehicle body frame 1. It is configured so that it can be done.

The gist of the present invention lies in the structure of the correction mechanism 11, and this structure will be described in detail below.

That is, as shown in FIGS. 2 to 5, the swivel table tilt correction mechanism 11 includes a fixing ring 13 fixed to the vehicle body frame 1 with fixing bolts 12, and a first bearing 14 disposed within the fixing ring 13. The first ring 15 is rotatably fitted and supported, and the pivot pin 16 is protruded from the lower end of the outer peripheral surface at a position facing 180 degrees.
It is rotatably supported in the first ring 15 via a swivel 16', and its upper end is rotatably fitted and supported in a swivel base ring 3a provided on the back surface of the swivel base 3 via a second bearing 17. A rotation drive unit 19 that relatively rotationally displaces the swivel base 3 and the first and second rings 15 and 18 via the second ring 18 and an internal gear 18a provided on the inner peripheral surface of the upper end of the second ring 18 and the second
A first ring interposed between the first ring 15 and the second ring 18 is located at a symmetrical position about the pivot center line L connecting the pivot pins 16, 16' of the ring 18.
The second inclination correction cylinders 20 and 21, the rotation prevention part 23 that prevents the swivel base 3 from rotating with respect to the vehicle body floor 22, and the fixing part 24 that integrally fixes the fixing ring 13 and the first ring 15. , and an inclination sensor 25 provided at the center of rotation of the swivel table 3 to detect the inclination state of the swivel table 3 and operate the rotation drive unit 19 and the first and second tilt correction cylinders 20 and 21.

Further, 15a and 15b are pivot parts provided on the upper part of the first ring 15, and the pivot parts 15a and 15b are
Pivot pins 16 and 16' protruding from the lower end of the outer peripheral surface of the second ring 18 are pivotally supported by the second ring 5b.

Further, the rotary drive unit 19 includes a rotary drive motor M mounted on the swivel base 3, and an output shaft 26 of the motor M.
is made to protrude below the swivel base 3, and a small gear 27 attached to the tip of the output shaft 26 is meshed with the internal gear 18a.

Therefore, the small gear 27 is rotated by the rotary drive motor M.
When rotated, the second ring 18, the first ring 15, and the swivel base 3 can be relatively rotationally displaced via the internal gear 18a.

In addition, the first and second tilt correction cylinders 20 and 21
is at a symmetrical position centered on the swing center line L connecting the pivot pins 16, 16' of the second ring 18,
Piston rod 20a of each cylinder 20, 21,
21a is pivoted to rod connection brackets 28, 29 protruding from the inner wall of the second ring 18.
The base ends of the cylinders 20 and 21 are pivotally connected to cylinder connection brackets 32 and 33 which project from the inner wall of the first ring 15, respectively.

Therefore, the first and second tilt correction cylinders 20, 2
By extending one of the rings 1 and shortening the other, the second ring 18 can be tilted at a desired angle about the swing center line L.

Further, as shown in FIG. 3, the rotation stopper 23 is attached to the vehicle body floor 22 so as to move forward and backward through the rotation prevention vertical hole 36 provided at one end of the swivel base 3. It consists of a rotation prevention pin 37 and a rotation prevention solenoid 38 that moves the rotation prevention pin 37 forward and backward.

The fixing part 24 also includes a pin insertion hole 39 provided in the fixing ring 13 in a transverse penetrating state, a fixing pin 40 that slides forward and backward into the pin insertion hole 39, and a fixing ring for moving the fixing pin 40 forward and backward. It consists of a fixing solenoid 41 attached to the outer wall of 13,
By pressing the tip of the fixing pin 40 against the outer wall of the first ring 15, the first ring 15 and the fixing ring 13 can be integrally fixed.

In addition, the above-mentioned rotation stop pin 37 and fixing pin 4
The forward and backward movement of 0 may be performed not only by a solenoid but also by hydraulic pressure or the like.

In addition, the tilt sensor 25 detects the tilt state of the swivel base 3, and the swing center line L of the second ring 18 is perpendicular to the virtual line connecting the highest point and the lowest point of the swivel base 3. The rotary drive motor M is driven until the rotating base 3 is positioned, and the first and second tilt correction cylinders 20 and 21 are expanded and contracted until the swivel table 3 is in a horizontal state.

The embodiment of the present invention is constructed as described above, and next, based on FIGS. 4 and 5, an example will be given in which a fire engine A with a folding ladder is stopped on the ground with a low left side. First, the procedure for correcting the inclination of the swivel table 3 will be explained.

First, the fixing pin 40 of the fixing part 24 is moved back to release the fixation of the first ring 15, so that it is rotatable relative to the fixing ring 13, and the detent pin 37 of the detent part 23 is moved forward. to prevent rotation of the swivel base 3, and then
The tilt sensor 25 detects the tilt state of the swivel base 3, and the rotation drive motor M rotates the first ring 15.
and the second ring 18 with respect to the imaginary line connecting the highest point and the lowest point of the swivel base 3.
The first ring 15 is fixed to the fixed ring 13 by rotating the first ring 15 until the swing center lines L thereof are perpendicular to each other, and in the same state, the fixing pin 40 is advanced.

In the same state, the first and second tilt correction cylinders 20 and 21 are located at the highest and lowest sides of the swivel table 3, respectively.

Next, the anti-rotation pin 37 of the anti-rotation part 23 is moved backward to release the anti-rotation of the swivel base 3, and the inclination sensor 25 detects the inclination state of the other 3.
The first tilt correction cylinder 20 located on the lowest downward side is operated to extend, and the second tilt correction cylinder 21 located on the highest side is shortened until the swivel table 3 is in a horizontal state.

[Brief explanation of the drawing]

FIG. 1 is a side view of a fire engine with a folding ladder having a structure for correcting the inclination of a swivel table according to the present invention. Second
The figure is a side sectional view of the main part. Figure 3 shows I of Figure 2.
- Line cross-sectional view. FIG. 4 is a side cross-sectional view showing the state before the tilt correction operation of the swivel table according to the present invention is performed.
FIG. 5 is a side sectional view showing a state in which the tilt correction operation of the swivel table according to the present invention is performed. A...Fire engine with folding ladder, 1...Vehicle frame, 2...Driving section, 3...Swivel base, 4...Folding ladder, 13...Fixing ring, 14...First bearing, 15...No. 1 ring, 16, 16'... Pivot pin, 17... Second bearing, 18... Second ring,
19... Rotation drive unit, 20, 21... First and second
Inclination correction cylinder, 22...Vehicle body floor, 23
... Rotating part, 24 ... Fixed part, 25 ... Tilt sensor.

Claims (1)

[Scope of claims for utility model registration] A. Fixing ring 13 fixed to vehicle body frame 1
(b) The first ring 15 is rotatably fitted and supported within the fixing ring 13, and (c) The first ring 15 is connected via pivot pins 16, 16' protruding from the outer peripheral surface at positions 180 degrees opposite each other. a second ring 18 rotatably supported within the second ring 18;
and a rotating base 3 on which a working machine such as a folding ladder 4 is mounted; The first and second inclination corrections are interposed between the first ring 15 and the second ring 18 at substantially symmetrical positions about the swing center line L connecting the pivot pins 16 and 16' of the second ring 18. cylinder 20,2
1, G. A rotation prevention part 23 that prevents the swivel base 3 from rotating with respect to the vehicle body floor 22; H. A fixing part 24 that integrally fixes the fixed ring 13 and the first ring 15; detects the inclination state of the rotary drive unit 19 and the first and second inclination correction cylinders 20,
A tilt correction structure for a swivel base in an aerial work vehicle, which comprises a tilt sensor 25 provided on a swivel base 3 to operate a tilt sensor 21.