JPH06191341A - Carrying platform inclining device for dump truck - Google Patents

Abstract

PURPOSE:To attain dumping ability even if cylinder lifting amount is small at the time of initial dump rising without using a connecting rod which a conventional method needs, and permit installation of the whole device even under the condition where the installation space of a cylinder cannot be obtained sufficiently in the conventional method. CONSTITUTION:One end of a body frame 2 is tiltingly-connected with the upper part of a sub-frame 1, a pair of supporting arms 3, 3 are formed inside the sub-frame 1, the middle part of the pair of supporting arms 3, 3 is rotatably- connected to the sub-frame 1, the base end of a multiple-stage expandable actuator 4 is rotatably-connected between the parts which are close to one ends of the pair of supporting arms 3, 3, and rollers 5, 5 which can be brought, into contact with the lower face of the body frame 2 are rotatably-formed respectively outside the parts which are close to the other ends of the supporting arms 3, 3. Stoppers 6, 6 which restrain the supporting arms 3, 3 from being rotated are formed on the base end side of the multiple-stage expandable actuator 4, and the top end of the multiple-stage expandable actuator 4 is rotatably- connected to the lower part of the body frame 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bed tilting device for a dump truck.

[0002]

2. Description of the Related Art Conventionally, a loading platform is arranged on the upper part of a subframe, and the rear end of the loading platform is rotatably connected to the subframe through a hinge. The rear end of the platform is rotatably mounted, and the platform is mounted on the platform tilting device of the direct push type dump truck with the tip of the piston rod of the hydraulic cylinder rotatably connected to the bottom of the platform and on the upper part of the subframe. Part is rotatably connected to the sub-frame via a hinge, a hydraulic cylinder is rotatably provided on the sub-frame, and a pair of link plates are provided between the sub-frame and the loading platform. The tip is rotatably connected to the side edge near the center of the link plate, connecting rods are provided on both sides of the hydraulic cylinder, and one end of the connecting rod is rotatably connected to the spindle of the hydraulic cylinder. end Link plate end rotatably connected to the, bed tilt system of tipper arm and the other end of the link plate and rotatably connected to the bottom of the bed type are known.

However, in the conventional loading platform tilting device for the dump truck, the cylinder lifting force is the smallest at the initial stage of lifting the dump truck, and in particular, when the mounting space for the cylinder is insufficient, the mounting angle of the cylinder is close to horizontal. In addition, since the lift of the cylinder becomes smaller, it becomes difficult to obtain the dumping capacity.

In the conventional arm type dump truck tilting device, the accommodation of the connecting rod must be taken into consideration, and the entire device becomes large. Therefore, when the installation space for the device cannot be obtained. Not suitable.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the need for a connecting rod as in the prior art, and to obtain a large dumping capacity even when the lift of the cylinder itself is small at the initial stage of dumping up, so that the mounting space for the cylinder is reduced. An object of the present invention is to provide a bed tilting device for a dump truck that can mount the entire device even when it is not sufficiently obtained.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the dump truck dump truck tilting device according to the present invention has one end of a body frame tiltably connected to an upper portion of the sub-frame so that the inside of the sub-frame is provided. A pair of support arms is provided, the middle of the pair of support arms is rotatably connected to the sub-frame, and the base end of the multistage telescopic actuator is rotated between the one ends of the pair of support arms. The multi-stage telescopic actuator is provided with stoppers that are freely connected to each other and rotatably provided outside the other end of the support arm so as to contact the lower surface of the body frame. Is provided on the base end side, and the tip end of the multistage telescopic actuator is rotatably connected to the lower portion of the body frame.

[0007]

[Operation] When the multistage telescopic actuator is operated, the tip side of the multistage telescopic actuator pushes up the other end of the lower part of the body frame, and the base end of the multistage telescopic actuator applies thrust to one end of the pair of support arms. The support arm receives the thrust and rotates about the support part in the middle of the support arm. One end of the support arm is lowered downward, and the other end of the support arm is raised upward, so that the support arm moves upward. Rollers rotatably provided outside the other end push up the lower surface of the body frame to start dumping.

The body frame starts tilting upward with respect to the subframe about one end of the body frame by the rotation of the support arm, and as the tilting of the body frame and the one end of the support arm lowers downward. The elevation angle of the multi-stage telescopic actuator becomes large. The support arm rotates until a stopper provided on the proximal end side of the multi-stage telescopic actuator prevents the support arm from being displaced close to one end, and the elevation angle of the multi-stage telescopic actuator is sufficiently obtained. The body frame is pushed upward by the thrust due to the extension on the tip side, and the body frame is inclined with respect to the sub-frame.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a bed tilting device for a dump truck according to the present invention, and a subframe 1 is attached to an upper side of a chassis frame (not shown). Subframe 1
A body frame 2 to which a luggage carrier (not shown) is attached is disposed above the, and the lower rear end of the body frame 2 is rotatably connected to the rear end of the subframe 1 in the longitudinal direction via a hinge 10. Has been done. A pair of support arms 3 are provided inside the sub-frame 1, and the pair of support arms 3 are rotatably connected to the sub-frame 1 in the middle thereof and are located near the rear ends of the pair of support arms 3. A base end of the multistage telescopic actuator 4 is rotatably connected between the rollers, and a roller 5 is rotatably provided outside the front end of the support arm 3 so as to abut against the lower surface of the body frame 2.
A stopper 6 for restraining the rotation of the support arm 3 is provided on the proximal end side of the multi-stage telescopic actuator 4, and the tip of the multi-stage telescopic actuator 4 is pivotable toward the lower end of the body frame 2 in the longitudinal direction. It is connected. In the present embodiment, the multistage telescopic actuator 4 is shown in FIG.
As shown in, the first cylinder 7, the second cylinder 8 and the third cylinder
A three-stage type having a cylinder 9 is used, and hereinafter, simply referred to as a three-stage actuator.

As shown in FIG. 2, the sub-frame 1 is provided with a horizontal member 12 in the middle of the vertical members 11, 11 parallel to each other in the longitudinal direction of the sub-frame 1, and a vertical member in the middle of the horizontal member 12. 11,
Two cylinder support members 13 and 13 are provided in parallel with 11, and the two cylinder support members 13 and 13 cross the longitudinal members 11 and 11 at the front end of the sub-frame 1 and are shown in FIG. 14 and a vertical member 1 parallel to the horizontal members 12 and 14.
It is fixed to and supported by each of the reinforcing members 15 and 15 provided inside 1 and 11. The cylinder support 13,
Substantially triangular plate-shaped support arms 3 and 3 are arranged inside 13, respectively, and the rotary shafts 16 and 16 are inserted through the middle edges of the support arms 3 and 3, respectively. Is rotatably provided by being axially supported by shaft support members 17, 17 provided inside the cylinder support members 13, 13, and a rotation is provided near the rear end between the support arms 3, 3. A support shaft 18 is laterally installed in parallel with the shafts 16 and 16.
At both ends, bearings are installed, and the central portion of the support shaft 18 is rotatable with respect to both ends. A three-stage actuator 4 is arranged between the support arms 3 and 3, and the base end of the three-stage actuator 4 is rotatably connected to a central portion of a support shaft 18 by a pin 19. An auxiliary plate 20 having a semicircular cutout formed so as to match the outer circumference of the cylinder tube 21 of the three-stage actuator 4 is laterally provided on the lower ends of the support arms 3 and 3. Further, rollers 5 and 5 are rotatably supported at the front ends of the outer sides of the support arms 3 and 3, respectively, and the upper portions of the rollers 5 and 5 contact the lower surface of the body frame 2 as shown in FIG. There is.

A pump unit 22 as hydraulic pressure supply means is connected to the cylinder tube 21 of the three-stage actuator 4 as shown in FIG. As shown in FIG. 2, a through hole 24 is provided at the tip of the piston rod 23 of the three-stage actuator 4, a support shaft 25 is inserted through the through hole 24 of the piston rod 23, and both ends of the support shaft 25 are The body frame 2 is supported by a shaft support portion 26 provided on a lower surface of a central portion near the front end of the body frame 2.

As shown in FIG. 2, the cross member 12 of the sub-frame 1 has a support shaft 18 on the base end side of the three-stage actuator 4.
When the stoppers 6 and 6 are welded and fixed toward the positions near both ends of the support arm 3 and the support arms 3 and 3 rotate about the rotary shafts 16 and 16, the stoppers 3 and 3 are disposed between the support arms 3 and 3. When the support shaft 18 on the base end side of the stepped actuator 4 contacts the stoppers 6 and 6, the rotation of the support arms 3 and 3 is suppressed.

As shown in FIG. 1, subframe 1
Body guides 27 are provided on the outer surfaces of the vertical members 11, 11 near the front ends thereof, and the inclined body frame 2 is provided on the outer surface of the one vertical member 11 of the sub-frame 1 near the rear end thereof. A safety rod 28 for holding the inclined position of the safety rod 28 is rotatably supported at one end thereof, and a safety rod support plate 29 is provided on the outer surface of the vertical member 11 closer to the front end than the position where the safety rod 28 is supported. The safety rod 28 is horizontally supported on the safety rod support plate 29 when not in use.

On the outer surface of the vertical member 32 of the body frame 2 corresponding to the one vertical member 11 of the sub-frame 1, there is provided a safety rod receiving portion 30 formed by being bent in a downward concave shape.
By locking the tip of the safety rod 28, the inclined position of the body frame 2 is maintained. Also, body frame 2
At the rear end of the vertical member 32, a hook 31 for locking the opening and closing of the rear gate of the loading platform (not shown) is provided.

Next, the operation of this embodiment will be described. When the body frame 2 is in the dumped state in which the body frame 2 is inclined forward and upward with respect to the sub-frame 1, first, the three-stage actuator 4 is moved from the position where the body frame 2 is lowered to the upper part of the sub-frame 1 shown in FIG. When pressure oil is supplied to the inside of the cylinder tube 21 by the pump unit 22, the piston rod 23 of the three-stage actuator 4
Pushes up the other end of the lower part of the body frame 2,
At this position, the three-stage actuator 4 is substantially horizontal, and the angle between the three-stage actuator 4 and the body frame 2 is small.

At this time, since the three-stage actuator 4 is substantially horizontal, the body rotation moment transmitted from the roller 5 of the support arm 3 is larger than the body rotation moment transmitted from the tip end side of the three-stage actuator 4 around the hinge 10. Is much larger.

Therefore, the thrust of the three-stage actuator 4 acts on the base end side of the three-stage actuator 4 and exerts a thrust on the rear ends of the support arms 3 and 3 via the support shaft 18, and the support arms 3 and 3. 3 receives the thrust and rotates in the clockwise direction in FIG. 3 about the rotary shafts 16 and 16 at the middle edges of the support arms 3 and 3, and the rear ends of the support arms 3 and 3 are lowered downward. , The front ends of the support arms 3 and 3 rise upward,
The body frame 2 is provided outside the front ends of the support arms 3 and 3.
While the rollers 5 and 5 contacting the lower surface of the body rotate, the lower surface of the body frame 2 is pushed up to start dumping.

The body frame 2 is rotated relative to the sub-frame 1 by rotating the support arms 3 and 3.
Tilting starts upward with the hinge 10 at the rear end as the center, and the tip of the three-stage actuator 4 gradually faces upward as the body frame 2 tilts.
As the position near the rear end of 3 is lowered downward, the base end of the 3-stage actuator 4 is gradually lowered and the elevation angle of the 3-stage actuator 4 is gradually increased. Therefore, the body rotation moment transmitted from the tip end side of the three-stage actuator 4 around the hinge 10 increases, while the body rotation moment transmitted from the rollers 5 and 5 of the support arms 3 and 3 gradually decreases. .

The support arms 3 and 3 rotate until the rear end of the support arm 3 is restrained by the support shaft 18 on the base end side of the three-stage actuator 4 contacting the stoppers 6 and 6. At this point, the elevation angle of the three-stage actuator 4 is sufficiently obtained, the body rotation moment transmitted from the tip side of the three-stage actuator 4 around the hinge 10 is large, and the required dumping capacity is obtained.

When the rotation of the support arms 3 and 3 is stopped, the thrust force of the body frame 2 transmitted from the rollers 5 and 5 of the support arms 3 and 3 disappears, but the thrust from the tip side of the three-stage actuator 4 is eliminated. And continue dumping. After this point, the normal direct dump operation is performed and the first
Following the cylinder 7, the second cylinder 8 and the third cylinder 9 are expanded to push the body frame 2 upward, and the body frame 2 is inclined with respect to the sub-frame 1 as shown in FIG.

When the pressure oil is removed from the inside of the cylinder tube 21 of the three-stage type actuator 4 after the dump work is completed, the piston rod 23 of the three-stage type actuator 4 is struck by the weight of the loading platform (not shown).
1 is retracted toward the inside of the body 1, and following the third cylinder 9, the body frame 2 is rotated about the hinge 10 with the contraction of the second cylinder 8 and the first cylinder 7 with respect to the sub-frame 1. When the lower surface of the body frame 2 comes into contact with the rollers 5 and 5 at the front ends of the supporting arms 3 and 3, the rollers 5 and 5 at the front ends of the supporting arms 3 and 3 are pushed down, so that the supporting arms 3 and 3 are approached. Rotates about the rotary shafts 16 and 16 in a counterclockwise direction in FIG.
At the time when the rear end side of the three-stage actuator 4 gradually rises upward, the elevation angle of the three-stage actuator 4 gradually decreases, and the three-stage actuator 4 becomes substantially horizontal, As shown in FIG. 3, the body frame 2
Moves to the upper part of the subframe 1.

[0022]

According to the loading platform tilting device for a dump truck of the present invention, one end of a body frame is tiltably connected to an upper portion of a subframe, and a pair of support arms are provided inside the subframe. Rotatably connected to the sub-frame, the base end of the multi-stage telescopic actuator is rotatably connected between one end of the pair of support arms, and the body frame is located outside the other end of the support arms. Each of the rollers that can come into contact with the lower surface of the multi-stage telescopic actuator is rotatably provided, and a stopper that suppresses the rotation of the support arm is provided on the base end side of the multi-stage telescopic actuator. By movably connecting, when the multi-stage telescopic actuator is operated at the beginning of climbing the dump truck, the tip side of the multi-stage telescopic actuator moves to the lower part of the body frame. While pushing up the end, the base end of the multi-stage telescopic actuator exerts a thrust on one end of the pair of support arms, and the support arm receives the thrust and rotates about the middle part of the support arm to support it. One end of the arm moves down, the other end of the support arm moves up, and the rollers rotatably mounted on the outside of the other end of the support arm push up the lower surface of the body frame. The actuator mounting angle is almost horizontal, and it is possible to start the dump even if the lift of the cylinder itself is small, and the body frame moves upward with respect to the sub frame centering on one end of the body frame due to the rotation of the support arm. The tilting of the body frame starts and the one end of the support arm lowers downward,
When the elevation angle of the multi-stage telescopic actuator becomes large and the support arm rotates until the stopper provided on the base end side of the multi-stage telescopic actuator rotates until the one end of the support arm is suppressed, Since a sufficient elevation angle can be obtained, after this point, the normal direct-push dump can be performed by the thrust by the extension of the tip side of the multi-stage telescopic actuator, and the multi-stage telescopic actuator can be installed almost horizontally and As described above, since the connecting rod is not used, the entire device can be downsized, so that the device can be deployed even if the installation space of the device is small.

[Brief description of drawings]

FIG. 1 is a cutaway front view of a main part of a dump truck tilting device according to an embodiment of the present invention.

FIG. 2 is a plan view of an essential part of FIG.

FIG. 3 is a cutaway front view of a main part showing a state where the body frame is lowered to the upper part of the subframe.

[Explanation of symbols]

 1 Sub-frame 2 Body frame 3 Support arm 4 3-stage actuator 5 Roller 6 Stopper 7 First cylinder 8 Second cylinder 9 Third cylinder 10 Hinge 11 Vertical member 12 Horizontal member 13 Cylinder support member 14 Horizontal member 15 Reinforcing member 16 Rotation Shaft 17 Shaft support member 18 Spindle 19 Pin 20 Auxiliary plate 21 Cylinder tube 22 Pump unit 23 Piston rod 24 Through hole 25 Support shaft 26 Shaft support portion 27 Body guide 28 Safety rod 29 Safety rod support plate 30 Safety rod receiving portion 31 Hook 32 vertical members

Claims (1)

[Claims] 1. An upper end of a subframe is tiltably connected to one end of the body frame, a pair of support arms is provided inside the subframe, and the middle of the pair of support arms is rotated with respect to the subframe. The base ends of the multi-stage telescopic actuators are rotatably connected between the one ends of the pair of support arms, and abut on the lower surface of the body frame on the outside of the other ends of the support arms. Each of the movable rollers is rotatably provided, and a stopper for restraining the rotation of the support arm is provided on the base end side of the multistage telescopic actuator, and the tip of the multistage telescopic actuator is pivoted to the lower part of the body frame. A loading platform tilting device for a dump truck characterized by being freely connected.