JP2603179Y2 - Dump type granule carrier - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dump-type powder / particle carrier which hydraulically controls the operation of an outrigger together with the tilting movement of a vehicle-mounted powder / particle storage tank.

[0002]

2. Description of the Related Art In order to discharge contents on a vehicle body, for example, in a standard loose car having a tank that is tilted and moved to about 20 degrees, it is not necessary to attach an outrigger,
With a total weight of 20 tons and a loading capacity of 10 tons, it is safe to dump and is suitable for transporting powdery powders such as cement powder, flour, slaked lime, etc. as standard contents.

However, it is necessary to set the dump angle (tilt angle) of the tank to about 40 degrees for granular quicklime, tanker powder, iron powder having a large specific gravity, etc. In this case, as shown in FIG. , The lower rear part of the vehicle body 1 and the tank 2
A pair of outriggers 4 are mounted near the dump hinge 3 to stabilize the posture of the vehicle body 1 during the above-mentioned tilting.

[0004] A front portion of the tank 2 is supported at one end by a vehicle body 1 and is provided with a hoist cylinder 5 which is capable of vertically moving.
Supported by

[0005] Reference numeral 6 denotes a wheel, and 7 denotes a discharge hose for powder or the like.

FIG. 8 is a hydraulic system diagram of the above-mentioned dumping type powder and grain carrier, wherein 11 is, for example, a compressor driven by using the rotational force of a vehicle engine, and 12 is a compressor.
The pump is a pump that selectively supplies the hydraulic oil in the drain tank 13 to the hoist cylinder 5, another three-way switching valve 15, and the outrigger 4 via the three-way switching valve 14 by the compressor 11.

In such a hydraulic system, while the vehicle is running,
The hydraulic pressure supplied from the pump 12 is returned to the drain tank 13 via the three-way switching valves 14 and 15 serving as control valves, but when the vehicle is stopped and the contents are discharged through the discharge hose 7 due to the tilting of the tank 2. Switches the three-way switching valve 15 to the left position in the figure.

As a result, the hydraulic pressure from the pump 12 is first supplied to the extension cylinder port of the outrigger 4, and the hydraulic oil of the compression cylinder port is supplied to the drain tank 13.
And the outrigger 4 is extended.

Next, the three-way switching valve 14 is manually or automatically switched to the left position in FIG.
Is supplied to the hoist cylinder 5, which expands and the tank 2 tilts around the dump hinge 3 to a predetermined angle.

Next, when the discharge of the contents is completed, the three-way switching valve 14 is switched to the right position in the figure.

Thus, while maintaining the supply of hydraulic pressure from the pump 12 to the extension-side cylinder port of the outrigger 4, the hydraulic oil of the hoist cylinder 5 is supplied to the drain tank 1
3 and the inclination of the tank 2 is returned in the horizontal direction.

In this manner, when the tank 2 is inclined at a predetermined angle or less or becomes horizontal, the three-way switching valve 15 is switched to the right position in the figure.

As a result, the hydraulic oil from the pump 12 is supplied to the contraction-side cylinder port of the outrigger 4 via the three-way switching valves 14 and 15, and the hydraulic oil from the extension-side cylinder port is returned to the drain tank 13, where 4 contracts, finally allowing the vehicle to run.

When the outrigger 4 is tilted as shown in FIG. 7, the tank load is applied to the dump hinge 3 and the hoist cylinder 5 by about 3: 1.
The load sharing ratio in the dump hinge 3 increases as the tilt angle increases.

On the other hand, when the load capacity is 10 tons and the dump angle (tilt angle) is 20 degrees, the non-usable limit of the outriggers 4 is approximately obtained.
The body frame may lose its strength,
Outriggers have become necessary even for the above standard loose vehicles due to the increase in the size of tanks due to the easing of total weight regulations.

[0016]

However, in such a conventional dump truck, the outrigger 4 must be extended for safety, and then the tank 2 must be lifted (tilted) and stopped. In addition, if this operation procedure is incorrect, it is extremely dangerous. In addition, since two three-way switching valves 14 and 15 are used, there is a problem that the operation and the configuration are complicated and the cost is greatly increased. .

Further, if the control valves 14 and 15 are automatically operated by using an electric switch or a solenoid valve, the cost is further increased, and the number of parts to be used is increased and the reliability is reduced. There was a point.

This invention has been made in order to solve the above-mentioned conventional problems. The tank can be raised and lowered by automatically extending the outrigger, and the structure and operation are simple. An object of the present invention is to obtain a dump-type powder carrier at low cost.

[0019]

Means for Solving the Problems To achieve the above object, a means of the present invention comprises a tank tiltably supported by a dump hinge at a rear portion of a vehicle body, and a hoist for tiltably raising and lowering a front portion of the tank. A cylinder, an outrigger attached to the lower part of the vehicle body near the dump hinge portion, and a three-way switching valve for selectively connecting the extension cylinder port and the contraction cylinder port of the hoist cylinder and the outrigger to a pump or a drain tank. A first circuit for connecting the three-way switching valve and the hoist cylinder, a second circuit branched from the first circuit and connected to the extension side cylinder port of the outrigger, A check valve provided in the circuit 2 for preventing backflow from the extension cylinder port, a three-way switching valve, and an outrigger A third circuit connected to the contraction side cylinder port, a check valve provided in the third circuit to prevent reverse flow from the contraction side cylinder port, and a branch branched from the third circuit to the drain tank. A fourth circuit connected thereto, and a pass valve provided in the fourth circuit, wherein the pass valve automatically generates back pressure in the third circuit from immediately before completion of tank lowering to completion. It is characterized by the following.

[0020]

According to the present invention, the dump-type granular material transport vehicle branches the port hydraulic pressure of the hoist cylinder, which is a single-acting cylinder, and connects the branched hydraulic pressure to the extension-side cylinder port of the outrigger. The tank can be raised (tilted) by the hoist cylinder.

Further, the hydraulic oil can be returned from the carry port of the three-way switching valve to the drain tank via the pass valve, and the hydraulic oil branched upstream of the pass valve can be supplied to the contraction cylinder port of the outrigger.

The pass valve is switched just before the tank lowering is completed and immediately after the tank raising is started, and a back pressure is generated in the carry port upstream of the pass valve until the tank lowering is completed until the tank lowering is completed to contract the outrigger. .

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The dumping type powder and grain carrier according to the present invention includes a tank 2 tiltably supported by a dump hinge 3 at a rear portion of a vehicle body, a hoist cylinder 5 for tiltably moving up and down a front portion of the tank 2, and the dump hinge 3. Outrigger 4 attached to the lower part of the vehicle body nearby, and hoist cylinder 5
The pump 12 or the drain tank 13 is connected to the extension cylinder port a and the compression cylinder port b of the outrigger 4.
And a three-way switching valve 24 selectively connected to the control valve. Further, the three-way switching valve 24 and the hoist cylinder 5
A first circuit A connecting the first circuit A, a second circuit B branched from the first circuit A and connected to the extension-side cylinder port a of the outrigger 4, and a second circuit B provided in the second circuit B. A check valve 25b for preventing backflow from the extension side cylinder port a, a third circuit C for connecting the three-way switching valve 24 and the contraction side cylinder port b of the outrigger 4,
Another check valve 25c provided in the third circuit C for preventing backflow from the contraction side cylinder port b;
A fourth circuit D branched from the third circuit C and connected to the drain tank 13; and a pass valve 26 provided in the fourth circuit D. The pass valve 26 is completed immediately before the completion of tank lowering. During this period, a back pressure is automatically generated in the third circuit C. The details will be described below.

FIG. 1 is a hydraulic system diagram showing a tank elevating unit in the dumping type granular material transporting vehicle according to the present invention. In FIG. 1, reference numeral 24 denotes hydraulic pressure from the pump 12 for the hoist cylinder 5 and the outrigger 4. This is a three-way switching valve for switching and supplying the cylinder port a to the extension side or the cylinder port b to the contraction side of the outrigger 4.

Reference numeral 26 is connected between the carry port N of the three-way switching valve 24 and the drain tank 13 to perform a switching operation immediately before the completion of the lowering of the tank 2 and immediately after the start of the upward movement. It is a pass valve that generates a back pressure on the carry port N until the completion, and contracts the outrigger 4.

The pass valve 26 is provided at, for example, a position shown in FIG. 7 in the lower part of the tank 2 so as to be switched immediately after the tank 2 starts to be raised and immediately before the descent is completed.

Reference numeral 25 denotes an operation check valve having three check valves 25b and 25c connected between the three-way switching valve 24 and the extension cylinder port a and the compression cylinder port b of the outrigger 4, respectively. is there.

Next, the operation will be described with reference to FIGS. First, as shown in FIG. 2, the three-way switching valve 24 is in the neutral position while the vehicle is traveling, so that the hydraulic pressure of the pump 12 passes through the carry port N side and the cylinder port of the outrigger 4 contracts. b.
The outrigger 4 is contracted, and the oil pressure equal to or higher than the contraction pressure is returned to the drain tank 13 through the pass valve 26.

Next, when the vehicle is stopped and the tank 2 is to be tilted about the dump hinge 3,
That is, when the contents of the tank 2 are to be discharged to the outside through the discharge hose 7, the three-way switching valve 24 is switched to the left position in the figure as shown in FIG.

By switching the three-way switching valve 24, the hydraulic pressure from the pump 12 causes the port of the hoist cylinder 5 and the check valve 25b to pass through the three-way switching valve 24, the first circuit A and the second circuit B. Are simultaneously supplied to the extension-side cylinder port a of the outrigger 4 through which the fluid flows.

However, in this case, the tank 2
Has reached a considerable weight by itself or by its contents, and bears a remarkably large load with respect to the load in the direction of extension of the outrigger 4, and generates a hydraulic pressure proportional to the load. Is sent to the extension side cylinder port a of the outrigger 4 from the beginning, the outrigger 4 extends first, and finally the lower end contacts the ground.

Thereafter, the load in the direction in which the outrigger 4 extends also gradually increases, and the hydraulic pressure is also supplied to the hoist cylinder 5.
Extend as shown in FIG. 3, and gradually tilt the tank 2 so as to lift the tank 2 around the dump hinge portion 3.

At this time, immediately after the tank 2 starts to be lifted (tilted), the pass valve 2 below the tank 2
6 is switched to the left position by the spring,
The contraction side cylinder port b of the outrigger 4 is connected to the drain tank 13 via the third circuit C and the fourth circuit D.

At this time, the outrigger 4 and the hoist cylinder 5 receive the oil pressure from the pump 12 and
Are both in an extended state.

Thus, the tank 2 is tilted,
After the contents are discharged, the three-way switching valve 24 is turned off as shown in FIG.
As shown in FIG.

Thus, the hydraulic pressure from the pump 12 is supplied from the carry port N of the three-way switching valve 24 to the fourth circuit D.
, The hydraulic fluid of the hoist cylinder 5 is also returned to the drain tank 13 via the first circuit A and the three-way switching valve 24.

As a result, no hydraulic pressure is generated in the carry port N and the contraction side cylinder port b of the hoist cylinder 5, and the outrigger 4 is extended and stretched.
The tank 2 will descend.

Immediately before the end of the lowering, as shown in FIG. 5, the pass valve 26 is pushed to the left in the drawing by the bottom of the tank 2 and is switched to the right position, that is, the throttle side. Back pressure occurs in N and the third circuit C.

As a result, the back pressure is reduced by the outrigger 4
, The check valve 25b is opened by the pilot pressure, and the outrigger 4 contracts. That is, after the lowering of the tank 2 is completed, the outrigger 4
Is contracted and stored.

Therefore, during the tilting movement of the tank 2, the outrigger 4 in the extended state holds the vehicle body safely, completely eliminating the possibility of causing an accident of overturning.

In the above embodiment, the pass valve 26 having the right throttle port is shown. However, the same effect can be obtained by using a pass valve 26A having a shut-off port as shown in FIG.

Further, if the pass valve 26 is a solenoid valve, and the lowering of the tank 2 is detected by a limit switch to operate the solenoid valve, the structure is somewhat complicated and the cost is increased, but the same effect is obtained. Can be

[0043]

[Effect of the invention] As described above, according to the invention, the fourth
The back valve is automatically generated in the third circuit from just before the tank lowering to the completion of the tank lowering, so that the outrigger is automatically extended and the tank is safely moved up and down. In addition to this, it is possible to obtain an advantageous effect that a configuration and a simple dumping type powder and grain carrier can be obtained at low cost.

[Brief description of the drawings]

FIG. 1 is a hydraulic circuit diagram showing a hydraulic system of a dump-type granular material carrier according to an embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram showing a neutral state of a hydraulic system in FIG.

FIG. 3 is a hydraulic circuit diagram showing an extension operation state of an outrigger and a hoist cylinder of the hydraulic system in FIG.

FIG. 4 is a hydraulic circuit diagram showing a lowering operation state of an outrigger and a hoist cylinder of the hydraulic system in FIG. 1;

FIG. 5 is a hydraulic circuit diagram showing an operation state of the hydraulic system in FIG. 1 immediately before the outrigger descends.

FIG. 6 is a part of a hydraulic circuit according to another embodiment of the pass valve.

FIG. 7 is a side view showing a general dumping type powder and grain carrier.

FIG. 8 is a hydraulic circuit diagram showing a hydraulic system of a conventional dump-type granular material carrier.

[Explanation of symbols]

 2 Tank 3 Dump hinge part 4 Outrigger 5 Hoist cylinder 12 Pump 13 Drain tank 24 Three-way switching valve 25b, 25c Check valve 26 Pass valve N Carry port A First circuit B Second circuit C Third circuit D Fourth circuit a Cylinder port on extension side b Cylinder port on compression side

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60P 1/16 B60P 3/22

Claims (1)

(57) [Scope of request for utility model registration] 1. A tank rotatably supported on a dump hinge portion at a rear portion of a vehicle body, a hoist cylinder for tiltably raising and lowering a front portion of the tank, an outrigger attached to a lower portion of the vehicle body near the dump hinge portion, and a hoist cylinder. And a three-way switching valve for selectively connecting the extension side cylinder port and the contraction side cylinder port of the outrigger to a pump or a drain tank, a three-way switching valve and a hoist cylinder are provided. A first circuit to be connected, a second circuit branched from the first circuit and connected to the extension-side cylinder port of the outrigger, and a backflow provided in the second circuit from the extension-side cylinder port. A third circuit for connecting the check valve for blocking, the three-way switching valve and the contraction side cylinder port of the outrigger, A check valve provided in the circuit to prevent backflow from the compression side cylinder port;
The fourth branch branched from the third circuit and connected to the drain tank
And a pass valve provided in a fourth circuit, wherein the pass valve automatically generates back pressure in the third circuit from immediately before completion of tank lowering to completion. Dump type powder carrier.