JPH0731475U - Dump type powder carrier - Google Patents

Abstract

(57) [Abstract] [Purpose] Along with being able to safely raise and lower the tank after automatically tensioning the outrigger, it is possible to obtain a dump-type granular material carrier having a simple structure and a low cost. [Structure] A tank 2 tiltably supported by a dump hinge portion 3 at a rear portion of a vehicle body, a hoist cylinder 5 for vertically tilting a front portion of the tank 2, and a hoist cylinder 5 attached to a lower portion of the vehicle body near the dump hinge portion 3. , An outrigger 4 in which an extension side cylinder port is branched and connected to the port 12 of the hoist cylinder 5, and hydraulic pressure from the pump 12 is transferred to the extension side cylinder port of the hoist cylinder 5 and the outrigger 4 by a three-way switching valve 24. Or connected to the carry port N side of the three-way switching valve 24 and the drain tank 13 so as to switch and supply to the compression side cylinder port of the outrigger 4, and immediately before the completion of the descent of the tank 2 and the start of the ascending. By the pass valve 26 that operates immediately after, from just before the completion of the descent of the tank 2 to the completion Back pressure is generated in the carry port N to contract the outrigger 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dump-type powdery-particle carrier for hydraulically controlling the tilting movement of a vehicle-mounted powdery-particles storage tank and the operation of an outrigger.

[0002]

[Prior art]

 Since the contents are discharged on the vehicle body, for example, a standard bulk vehicle equipped with a tank that tilts about 20 degrees does not need to have an outrigger attached. However, it is safe and suitable for transporting powdered powder such as cement powder, wheat flour, and slaked lime as standard contents.

However, in the case of granular lime, tantalum powder, iron powder having a large specific gravity, etc., the dump angle (tilt angle) of the tank needs to be about 40 degrees. In this case, as shown in FIG. A pair of outriggers 4 is attached to the lower rear part of the vehicle body 1 near the dump hinge portion 3 of the tank 2 to stabilize the posture of the vehicle body 1 during the tilting.

A front portion of the tank 2 is supported by a vehicle body 1 at one end thereof and supported by a hoist cylinder 5 which is vertically movable.

Reference numeral 6 is a wheel, and 7 is a discharge hose for powder or the like.

FIG. 8 is a hydraulic system diagram of the dump type granular material carrier, 11 is a compressor driven by using the rotational force of an engine of the vehicle, and 12 is a compressor 11 for example. This is a pump that selectively supplies the hydraulic oil in the drain tank 13 to the hoist cylinder 5, the other three-way switching valve 15 and the outrigger 4 via the three-way switching valve 14.

In such a hydraulic system, while the vehicle is traveling, the hydraulic pressure supplied from the pump 12 is returned to the drain tank 13 via the three-way switching valves 14 and 15, but the vehicle is stopped and the tank 2 tilts. When the contents are discharged through the discharge hose 7, the three-way switching valve 15 is switched to the direction in the figure.

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

Next, the three-way switching valve 14 is manually or automatically switched to the right in the figure, and the hydraulic pressure from the pump 12 is supplied to the hoist cylinder 5, which extends and the tank 2 moves around the dump hinge portion 3. As a tilt angle.

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

As a result, the hydraulic oil of the hoist cylinder 5 is returned to the drain tank 13 while maintaining the supply of the hydraulic pressure from the pump 12 to the extension side cylinder port of the outrigger 4, and the inclination of the tank 2 in the horizontal direction. I will return to.

In this way, when the tank 2 is inclined at a predetermined angle or less or is horizontal, the three-way switching valve 15 is switched to the left 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 expansion side cylinder port hydraulic oil is returned to the drain tank 13. The outrigger 4 contracts, and finally the vehicle can run.

Further, when the outrigger 4 tilts as shown in FIG. 4 of the tank 2, its tank load is shared by the dump hinge part 3 and the hoist cylinder 5 at a ratio of about 3 to 1, so that the tilting angle is large. The load sharing ratio in the tank hinge portion 3 increases as much as possible.

On the other hand, a load capacity of 10 tons and a dump angle (tilt angle) of 20 degrees are generally unusable limits of the outrigger 4, and when the load on the dump hinge portion 3 increases, the vehicle body frame may lose strength. Yes, and due to the increase in tank size associated with the deregulation of total weight regulations, outriggers are becoming necessary even for the above standard bulk vehicles.

[0016]

[Problems to be Solved by the Invention]

 However, in such a conventional dump-type granular material carrier, for safety reasons, the outrigger 4 must be stretched before the tank 2 is lifted (tilted) and stopped. In addition to being extremely dangerous, there is a problem in that the two control valves 14 and 15 are used, which complicates the operation and the configuration and significantly increases the cost.

Further, if an attempt is made to automatically operate the control valves 14 and 15 using an electric switch or a solenoid valve, the cost will be further increased, resulting in an increase in the number of parts used and a decrease in reliability. There was a problem.

The present invention has been made to solve the above-mentioned conventional problems, and it is possible to automatically raise and lower the outrigger and then raise and lower the tank, and the structure and operation are The purpose is to obtain a simple dump-type granular material carrier at low cost.

[0019]

[Means for Solving the Problems]

 A dump type granular material carrier according to the present invention includes a tank tiltably supported by a dump hinge portion at a rear portion of a vehicle body, a hoist cylinder for vertically tilting a front portion of the tank, and the vicinity of the dump hinge portion. Installed on the lower part of the body of the hoist cylinder, and an outrigger with the extension side cylinder port branched and connected to the port of the hoist cylinder. Connected to the cylinder port or the compression side cylinder port of the outrigger, and connected between the carry port side of the three-way switching valve and the drain tank, immediately before the completion of the descent of the tank and immediately after the start of the ascent. The pass valve that activates the By generating a back pressure over preparative it is obtained so as to shrink the outriggers.

[0020]

[Action]

 The dump type granular material carrier according to the present invention branches the port hydraulic pressure of the hoist cylinder, which is a single-acting cylinder, and connects it to the extension side cylinder port of the outrigger. Allows the tank to rise (tilt).

Further, the operating oil can be returned from the carry port of the control valve to the drain tank via the pass valve, and the operating oil branched at the front part of the pass valve can be supplied to the contracting cylinder port of the outrigger.

Then, the pass valve is operated immediately before the completion of the tank descent and immediately after the start of the tank ascent, and a back pressure is generated in the carry port immediately before the completion of the tank descent to contract the outriggers.

[0023]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a hydraulic system diagram showing a tank elevating / lowering part in a dump type granular material carrier of the present invention. In FIG. 1, 24 is a pump. It is a three-way switching valve for switching and supplying the hydraulic pressure from 12 to the hoist cylinder 5 and the extension side cylinder port of the outrigger 4 or the contraction side cylinder port N of the outrigger 4.

Further, 26 is connected between the carry port side of the three-way switching valve 24 and the drain tank 13 and operates immediately before the completion of the descent of the tank 2 and immediately after the start of the ascending of the tank 2 and is completed immediately before the completion of the descent of the tank. Is a pass valve that causes back pressure to be generated in the carry port N and causes the outrigger 4 to contract.

The pass valve 26 is provided at a position shown by a dotted line in FIG. 7 so as to operate at a lower portion of the tank 2 immediately after the tank 2 starts to rise and immediately before the tank 2 is completely lowered.

Further, 25 is an operating check valve having one check valve 25 a, 25 b connected between the three-way switching valve 24 and the extension side cylinder port and the contraction side cylinder port of the outrigger 4. .

Next, the operation will be described with reference to FIGS. 2 to 5. First, as shown in FIG. 2, the three-way switching valve 24 is set to the neutral position while the powder / particle carrier is running. Therefore, the hydraulic pressure of the pump 12 is supplied to the contracting cylinder port of the outrigger 4 through the carry port N side to contract the outrigger 4, and the hydraulic pressure above the contracting pressure is passed through the pass valve 26 to the drain tank 13. Returned to.

Next, when the traveling of the vehicle is stopped and the tank 2 is tilted about the dump hinge portion 3, that is, the contents of the tank 2 are discharged to the outside through the discharge hose 7. In this case, as shown in FIG. 3, the three-way switching valve 24 is operated rightward in the figure.

By the operation of the three-way switching valve 24, the hydraulic pressure from the pump 12 causes the port of the hoist cylinder 5 via the three-way switching valve 24 and the extension side cylinder port of the outrigger 4 via the operate check valve 25. Are supplied to the same time.

However, in this case, the tank 2 has reached a weight equivalent to that of the tank 2 by itself or by the contents, and thus bears a significantly large load with respect to the load in the extending direction of the outrigger 4, that is, Since a hydraulic pressure proportional to the load is generated, most of the hydraulic pressure is sent from the beginning to the extension side cylinder port of the outrigger 4, the outrigger 4 extends, and finally the lower end comes into contact with the ground.

Therefore, thereafter, the load in the extending direction of the outrigger 4 also gradually increases, the hydraulic pressure is also supplied to the hoist cylinder 5, and the hoist cylinder 5 expands as shown in FIG. Gradually tilt the tank 2 so that the dump hinge 3 is lifted up.

At this time, immediately after the start of the ascending (tilting) of the tank 2, the pass valve 26 at the lower portion of the tank 2 is switched to the left in the drawing to assist the extension of the outrigger 4. It functions to return the hydraulic oil from the compression side cylinder port to the drain tank 13.

At this time, receiving the hydraulic pressure from the pump 12, both the outrigger 4 and the hoist cylinder 5 maintain the extended state.

In this way, after the tank 2 is tilted and the contents are discharged, the three-way switching valve 24 is switched to the left as shown in FIG.

As a result, the hydraulic pressure from the pump 12 flows to the pass valve 26 and the drain tank 13 via the carry port N of the three-way switching valve 24, and the working oil of the hoist cylinder 5 also flows to the three-way switching valve 24. It is returned to the drain tank 13 via.

As a result, no hydraulic pressure is generated in the carry port N and the port of the hoist cylinder 5, and the tank 2 is lowered while the outrigger 4 is being stretched.

Immediately before the end of this descent, as shown in FIG. 5, the pass valve 26 is pushed leftward in the figure by the bottom of the tank 2, so that back pressure is generated in the carry port N.

As a result, the outrigger 4 contracts. That is, the outrigger 4 is contracted and stored after the lowering of the tank 2 is completed.

Therefore, the vehicle is stably held by the outrigger 4 during the tilting movement of the tank 2, and the risk of a fall accident is completely eliminated, and safety is ensured.

Although the pass valve 26 having the throttle port is shown in the above embodiment, the same effect can be obtained even if the pass valve 26A having the cutoff port as shown in FIG. 6 is used.

Further, even if the pass valve 26 is a solenoid valve and the limit switch detects the descent of the tank 2 to operate the solenoid valve, the number of configurations is complicated and the cost is increased, but the same effect is obtained. Is obtained.

[0042]

【The invention's effect】

 As described above, according to the present invention, the tank tiltably supported by the dump hinge portion at the rear portion of the vehicle body, the hoist cylinder for vertically tilting the front portion of the tank, and the lower portion of the vehicle body near the dump hinge portion. The outrigger is attached to the port of the hoist cylinder and the extension side cylinder port is branched and connected, and the hydraulic pressure from the pump is transferred to the extension side cylinder port of the hoist cylinder and the outrigger by the three-way switching valve, or the outrigger. Is connected to the carry port side of the three-way switching valve and the drain tank, and is operated by a pass valve that operates immediately before the completion of the descent of the tank and immediately after the start of the ascending. From the point just before the completion of the tank descent to the above Since it is configured to generate pressure to cause the outriggers to contract, it is possible to automatically lift the outriggers before raising or lowering the tank, and to construct a simple dump-type granular material carrier. The effect is that it can be obtained at low cost.

[Brief description of drawings]

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

FIG. 2 is an operation explanatory view showing one operation state of the hydraulic system in FIG.

FIG. 3 is an operation explanatory view showing another operation state of the hydraulic system in FIG.

4 is an operation explanatory view showing still another operation state of the hydraulic system in FIG. 1. FIG.

5 is an operation explanatory diagram showing still another operation state of the hydraulic system in FIG. 1. FIG.

FIG. 6 is a conceptual diagram showing another embodiment of the pass valve in FIG.

FIG. 7 is a side view showing a general dump type granular material carrier.

FIG. 8 is a system 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 26 Pass valve N Carry port

Claims (1)

[Scope of utility model registration request] 1. A tank that is tiltably supported by a dump hinge portion at a rear portion of a vehicle body, a hoist cylinder that vertically tilts a front portion of the tank, and a hoist attached to a lower portion of the vehicle body near the dump hinge portion. Outrigger in which the extension side cylinder port is branched and connected to the cylinder port, and three directions to selectively supply the hydraulic pressure from the pump to the extension side cylinder port of the hoist cylinder and the outrigger or the contraction side cylinder port of the outrigger. It is connected between the switching valve and the carry port side of the three-way switching valve and between the drain tank, and operates immediately before the completion of the descent of the tank and immediately after the start of the ascending of the tank. And a pass valve that causes the outriggers to contract. Pump type powder carrier.