JPS6349652B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loading platform tilting device for a dump truck, which includes a hoist cylinder, a lift plate, and a tension rod, and is combined with a link mechanism.

In the loading platform tilting device for a dump truck, a collision part is formed at the end of the chassis frame behind the dump hinge of the loading platform, and the engagement part at the bottom of the rear end of the loading platform hits this collision part to adjust the maximum tilting angle of the loading platform. It is designed to regulate.

Therefore, compared to the distance between the point of application of the lifting force of the loading platform and the dump hinge, the distance between the engagement part at the bottom of the rear end of the loading platform and the dump hinge that hits the end of the chassis frame is is extremely small, so when tilting, an excessive force is applied to the abutment part that regulates the maximum tilt angle of the loading platform due to the left and right lever action using the dump hinge as a fulcrum, deforming the shear sea frame and loading platform. Or it could be damaged.
In addition, the collision sound when the engaging portion at the bottom of the rear end of the cargo platform collided with the abutting portion of the chassis frame was also loud and noisy.

In view of the above points, the present invention allows the rod end of the hoist cylinder to be locked in the shock absorbing mechanism without causing the bottom of the rear end of the loading platform to hit the collision part of the chassis frame that regulates the maximum inclination angle of the loading platform. The maximum inclination angle is determined to ensure the stability of related parts and to minimize noise.The hoist cylinder is attached to a crosshead with both ends pivoted between opposing lift plates. A dump truck characterized in that a rod end is attached, and a shock absorbing mechanism is provided on a connecting shaft that pivotally connects the lift plate and the tip of the tension rod, so that the rod of the hoist cylinder can be freely locked when the hoist cylinder is at its maximum inclination angle. This is a loading platform tilting device.

To explain the embodiment of the device of the present invention with reference to the drawings, the tip of the rod 2A of the hydraulic hoist cylinder 2 whose base end is pivoted to the chassis frame 1 is pivoted at both ends to lift plates 3, 3 facing left and right. The tips of tension rods 6, 6, which are attached to the crosshead 4 and whose base ends are pivotally connected to the support pieces 5, 5 fixed to the chassis frame 1, are connected to the corresponding lift plates 3, 3 via the connecting shaft 7, respectively. It is pivoted.

A buffer mechanism 8 is provided at the longitudinal center of the connecting shaft 7.
This buffer mechanism 8 is shown in FIGS. 3 to 5.
As shown in the figure, when the hoist cylinder 2 stands up and reaches the maximum inclination angle, the upper part of the rod 2A of the hoist cylinder 2 can be elastically inserted and held, and when the hoist cylinder 2 moves from the maximum inclination angle to the lowered position, The buffer member 9 is provided with a locking/disengaging groove 9a that allows the rod 2A of the hoist cylinder 2 to be freely locked so that the rod 2A of the hoist cylinder 2 is immediately released.

In this case, the buffer member 9 is made of a material with wear resistance and elasticity, such as hard rubber or synthetic rubber such as iron rubber, and the supporting pieces 11, 11 are attached to fixtures 10, 10 fixed to the connecting shaft 7, respectively. The intermediary base is fixed on both sides and is provided along the connecting shaft 7, and the engagement/disengagement groove 9a is formed between the branch parts 9b, 9b and opens laterally, and the width m is the same as that of the rod 2A of the hoist cylinder 2. It is made slightly smaller than the diameter d, and as the rod 2A is inserted through the opening of the engagement/disengagement groove 9a, the branch parts 9b, 9b each move outward, expanding the engagement/disengagement groove 9a and tightly fitting the rod 2A deep inside. The branch portions 9b, 9b are formed to fit and hold the rod 2A.

The lift plates 3, 3 are integrally constructed by a connecting piece 12, and are pivotally connected via a mounting shaft 15 to a bearing portion 14 fixed to the bottom of the loading platform 13. In the figure, 16 is a dump hinge.

Since the apparatus of the present invention is constructed as described above, when the hoist cylinder 2 is operated to extend the rod 2A, a tensile force is applied to the tension rods 6, 6, a compressive force is applied to the hoist cylinder 2, and the lift plate 3, 3, the loading platform 13 rises to rotate about the dump hinge 16, and before the engaging portion 18 of the loading platform 13 hits the abutting portion 17 at the rear end of the chassis frame 1, the rod 2A of the hoist cylinder 2 is inserted into the locking/disengaging groove 9a of the buffer member 9 while expanding, and the loading plate 13 is opened by the lift plates 3, 3, crosshead 4, and rod 2A that locks into the locking/disengaging groove 9a of the buffer member 9. The tilt angle is regulated and the tilt position state is determined.

In this way, the rod 2A is held by the buffer member 9 before the loading platform 13 reaches its maximum inclination angle, and by setting the locking state in the locking/disengaging groove 9a, the loading platform 13
Since the maximum inclination angle position can be maintained, no collision noise is generated.

In this example, the buffer member is made of a material with wear resistance and elasticity, and the engagement/disengagement groove is defined by a branch part, but instead of this, a buffer mechanism using a spring or a shock absorber It may also be a mechanism.

In this way, the expansion and contraction movement of the hoist cylinder rod can be controlled without providing an abutting portion at the rear end of the chassis.
When the related structure between the tension rod and the lift plate is selected and the rod is held by the buffer member, the loading platform is positioned at the maximum inclination angle so that the loading platform is at the maximum inclination angle.

Since the maximum inclination angle of the loading platform is set by the rod of the hoist cylinder and the buffer mechanism, the present invention eliminates collision points, increases the stability of related members, prevents damage, and improves the overall It has the effect of reducing noise.

[Brief explanation of the drawing]

Fig. 1 is a side view of a dump truck equipped with the device of the present invention at the maximum inclination of the loading platform, Fig. 2 is a perspective view of the main parts of the device of the present invention, and Fig. 3 shows the same lift plate, hoist cylinder, tension rod, and FIG. 4 is a cross-sectional view of the main part showing the structure related to the buffer mechanism provided on the connecting shaft that connects the lift arm, FIG. 4 is a plan view showing the main part of the buffer mechanism in the device of the present invention, and FIG. FIG. 3 is a plan view of the main part of the hoist cylinder in a state where the rod is fitted and held. 1... Shear sea frame, 2... Hoist cylinder, 2A... Rod, 3... Lift plate, 4... Cross head, 5... Span, 6... Tension rod, 7... Connection shaft, 8... Buffer Mechanism, 9... Buffer member, 9a... Engagement/disengagement groove, 9b...
Branch part, 10... Fixture, 11... Branch piece, 13...
...Cargo platform, 14...Bearing section, 16...Dump hinge.

Claims (1)

[Claims] 1. Attach the rod end of the hoist cylinder to a crosshead whose both ends are pivotally supported between opposing lift plates, and attach the rod of the hoist cylinder to the connecting shaft that pivotally connects the lift plate and the tip of the tension rod when the hoist cylinder is at its maximum inclination angle. A loading platform tilting device for a dump truck, characterized by being provided with a buffer mechanism that can be freely locked.