JPH11268576A - Dump type tank trailer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To be natural in space, prevent an accident and simply operate the trailer by providing a hydraulic circuit for a hydraulic cylinder in such a manner that a hydraulic oil tank, a first conduit and an operating valve are arranged on the tractor side, and a second conduit, a third conduit and a switching valve are arranged on the trailer side. SOLUTION: A tank trailer 15 is so constructed that a trailer 16 having a tank 1 is towed by a tractor 17. A hydraulic circuit for elongating and contracting a hydraulic cylinder 5 is provided in such a manner that a hydraulic oil tank 6, a first conduit 29, and an operating valve 8 are arranged on the tractor 17 side, and a corresponding coupling 34, a second conduit 35, a third conduit 37 and a switching valve 40 are arranged on the trailer side. The coupling 31 at the tip is connected to the corresponding coupling on the trailer 16 side, and oil is supplied from the tractor 17 side to the hydraulic cylinder 5 so that the tank 1 is pushed from the horizontal attitude to the dump attitude. It is sufficient for an operator to only switch the operating valve 8 and connect and disconnect the couplings in unloading.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a dump type tank trailer. That is, the present invention relates to a dump type tank trailer in which a trailer having a tank mounted on a chassis is towed by a tractor and the tank can be tilted by a hydraulic cylinder.

[0002]

2. Description of the Related Art FIG. 6 is a hydraulic circuit diagram of a conventional example in such a dump type tank trailer. The dump-type tank trailer is used, for example, as a granular material carrier, and flour, carbon, and other granular materials are loaded in the tank 1 in a loosely dispersed state. A loading manhole 2 is attached to the upper part of the tank 1 and an outflow part 3 is attached to the rear end of the tank 1. The lower part of the rear end of the tank 1 is located above the rear part of the trailer chassis by a dump hinge 4. Is pivoted to. A hydraulic cylinder 5 is mounted between the front end of the tank 1 and the chassis of the trailer, and the hydraulic cylinder 5 expands and contracts to keep the tank 1 in a normal horizontal posture (as shown in the drawing) and when unloading. It can be displaced to the tilted dump posture.

[0003] A hydraulic circuit for extending and retracting the hydraulic cylinder 5 has conventionally been constructed as follows. That is, first, on the tractor side, a hydraulic oil tank 6, a pump 7, an operation valve 8, and the like are sequentially arranged via a pipe 9;
The pump 7 is a P.P. T. O. The apparatus 10 is driven to rotate. The tractor side operation valve 8 and the trailer side hydraulic cylinder 5 are connected to a pipe 11.
Between them, a large-diameter main hose 12 and a small-diameter return hose 13 are interposed.

The main hose 12 is used to extend and retract the hydraulic cylinder 5. When the tank 1 is in the dumping posture during unloading, the operation valve 8 is switched from the illustrated state to the supply state, Used to connect. Note that the connection between the coupling portions 14 is disconnected at all times except when unloading. On the other hand, the return hose 13 prevents the oil in the pipe 11 from expanding due to a rise in temperature at any time other than during unloading, for example, during traveling of the tank trailer, so that the hydraulic cylinder 5 is not inadvertently extended. The oil thus expanded is used to return the oil to the hydraulic oil tank 6. In such a constant state, the operation valve 8 is switched, for example, to the state shown in the figure. That is, if the oil expanded in this way is not returned, the oil pressure rises due to the expanded oil during running other than unloading, for example, during running, and the hydraulic cylinder 5 is inadvertently extended, and the tank 1 is opened. There is a danger of an accident occurring, pushing up from a horizontal position to a tilted dump position. Furthermore, after the fact, there is a danger of occurrence of an accident that the tank 1 naturally returns from the dumping posture to the horizontal posture and bounces against the tank receiver on the chassis side of the trailer, thereby deforming and damaging the tank 1. Therefore, in order to avoid such an accident, the return hose 1 together with the main hose 12 is provided between the tractor and the trailer as described above in this type of conventional example.
3 were indispensably interposed and used.

[0005]

The following problems have been pointed out in such a conventional example. In the tank trailer, a trailer provided with a tank 1 is towed by a tractor so as to be swingable in the left-right direction. The tractor as a towing vehicle has a cab driving cab with wheels in front and a rear portion with wheels. It has a frame. And the cab back on the rear frame of this tractor
A large tank 1 on the trailer side is approaching from behind, and has a very narrow space, and is provided with an air hose and the like for a brake.

In view of this, the large-diameter main hose 12 of the hydraulic circuit for the hydraulic cylinder 5 described above is disposed in such an extremely narrow cabback, and is driven by the left-right swing of the trailer to be halfway in the left-right direction. It is extremely difficult to make it rotatable. Therefore, the main hose 12 having one end connected to the operation valve 8 on the tractor side is conventionally provided with a coupling portion 14 at the other end as described above. The connection was released and disconnected, and stored in the tractor side, and separated from the piping 11 on the trailer side. Then, only when unloading, that is, when the hydraulic cylinder 5 expands and contracts, the coupling portions 14 are connected to each other to connect the coupling between the tractor side and the trailer. On the other hand, the small-diameter, high-pressure return hose 13 must always be connected from the viewpoint of its function. Therefore, regarding the return hose 13 having one end connected to the tractor-side operation valve 8, conventionally, the other end is always connected to the trailer-side piping 11 at the time of unloading as well as during traveling. It was interposed between the trailer and the trailer so that it could rotate half a turn in the left-right direction.

However, first, as described above,
The cab-back on the rear frame of the tractor is extremely narrow in space, and an air hose for brakes and the like are provided. Therefore, in such a place, it has been pointed out that in the conventional example in which the return hose 13 is always interposed and connected, the return hose 13 is obstructive and the installation space is impossible. Was. That is, in the past, the return hose 13 was provided while making it difficult to manufacture. Second, as for the production problem,
It has also been pointed out that the return hose 13 is indispensably used together with the main hose 12, which increases the cost. That is, in addition to the main hose 12 for the expansion and contraction movement of the hydraulic cylinder 5, a return hose 13 for preventing accidents is conventionally required, and the production cost is increased by using two hoses. Was pointed out. Third
Further, the return hose 13 is always interposed and connected between the tractor side and the trailer through a narrow cab bag, and is driven by the left and right swing of the trailer pulled by the tractor to move in the left and right direction. It was half a turn. Therefore, if used for a long time, the return hose 13 will be damaged,
It was pointed out that it was easily damaged.

The present invention has been made in view of such circumstances, and has been made in order to solve the problems in the above conventional example.
For the hydraulic circuit for extending and retracting the hydraulic cylinder that tilts the tank, the hydraulic oil tank, the first pipeline, the hose, the pump, the operating valve, the coupling, etc. are arranged on the tractor side, and the corresponding coupling is installed on the trailer side. , A second conduit, an accumulator, a third conduit, a check valve, a switching valve such as a solenoid valve, a detecting means such as a switch, and the like.
Second, the production cost is excellent, and thirdly, hose damage and breakage are avoided,
Fourth, accidents such as the tank being inadvertently pushed up or bouncing due to an increase in temperature during traveling or the like are prevented. Fifth, these are easily realized by a simple operation. The aim is to propose a tank trailer.

[0009]

The technical means of the present invention for solving such a problem is as follows. First, claim 1 is as follows. The dump type tank trailer according to the first aspect is of a trailer type in which a trailer having a tank is towed by a tractor. The tank is mounted on the undercarriage of the trailer, a hydraulic cylinder is mounted between the front end and the undercarriage, and has a horizontal posture at all times and a dumping posture tilted rearward during unloading,
It can be displaced. And on the tractor side, a hydraulic oil tank, a hose connected to the hydraulic oil tank via a first pipeline, a pump and an operation valve arranged in series with the first pipeline, and the hose And a coupling provided at the tip of the. Also, on the trailer side, a corresponding coupling connectable to the coupling, a second pipeline disposed between the corresponding coupling and the hydraulic cylinder, and a branch from the middle of the second pipeline. Third to the accumulator
A pipe, a check valve and a switching valve arranged in parallel with the third pipe, detecting the presence or absence of connection between the coupling and the corresponding coupling, and opening and closing the switching valve based on the detection result; And a detecting means for detecting the occurrence of a fault.

Next, claim 2 is as follows. According to the second aspect of the present invention, there is provided a dump type tank trailer.
In the dumping type tank trailer described in the above, flour, carbon, and other powder and granular material are loaded in a bulk state in the tank, and the tank is provided with a loading manhole at the top. An outflow portion is provided at the rear end, and a lower portion of the rear end is pivotally supported on a rear portion of the chassis by a dump hinge. The hydraulic cylinder has one end pivotally attached to the front end of the tank and the other end pivotally attached to the front of the chassis. It is designed to be displaced to the posture. Further, the coupling and the corresponding coupling can be switched to open when both are connected to each other and closed when not connected to each other.

Next, claim 3 is as follows. According to the third aspect of the present invention, there is provided a dump type tank trailer.
Wherein the cover is pivotally mounted on the front of the chassis. The cover is
It is rotatable between a lower cover position dropped before the corresponding coupling and an upper retreat position lifted from the front of the corresponding coupling. The switching valve comprises an electromagnetic valve, and the detecting means comprises a switch. The switch is first turned off at the lower cover position of the cover, detects the absence of connection between the coupling and the corresponding coupling, and opens or continues the solenoid valve. Further, the switch is turned on at the upper evacuation position of the cover, detects connection between the coupling and the corresponding coupling, and closes or disconnects the solenoid valve.

This dump type tank trailer is configured as described above. Therefore, the tank is always in a horizontal posture, and the connection between the coupling at the tip of the hose on the tractor side and the corresponding coupling on the trailer side is disconnected. Also, on the trailer side, the cover is dropped to the lower cover position, and the detecting means, for example, the switch is off, and the connection between the coupling and the corresponding coupling is detected, and a switching valve such as a solenoid valve is connected. I have. Therefore, in such a case, when the oil in the second and third pipelines on the trailer side expands due to the temperature rise, the oil corresponding to the expansion, that is, the oil pressure, is closed when the corresponding coupling is closed and the closed circuit is closed. Is collected and stored in the pressure accumulator through the second pipe, the third pipe, and a switching valve such as an electromagnetic valve.

Now, in such a normal state,
In the tank, for example, the granular material is loaded from the manhole and travels to the destination. Next, at the time of unloading, the cover is first lifted to the upper evacuation position from the above-described normal state, and the coupling at the hose tip is connected to the corresponding coupling. Then, a detecting means, for example, a switch is turned on to detect the connection between the coupling and the corresponding coupling, and the switching valve such as the electromagnetic valve is switched off. Therefore, the high-pressure oil stored in the pressure accumulator,
The fluid is collected in the hydraulic oil tank via a third pipe, a check valve, a second pipe, a corresponding coupling, a coupling, a hose, an operation valve, and the like. Thereafter, when the operating valve is switched and the pump is driven to rotate, the oil in the hydraulic oil tank is transferred to the hydraulic cylinder via the first pipe, the operating valve, the hose, the coupling, the corresponding coupling, the second pipe, and the like. Supplied.
Then, the hydraulic cylinder is extended, the tank is pushed up to a dump posture tilted around the dump hinge, and the loaded particulates are unloaded from the outflow portion. Next, when the unloading is completed, the hydraulic cylinder is shortened by the weight of the tank by switching the operation valve, the tank is lowered to the original horizontal position, and the oil in the hydraulic cylinder is discharged to the second pipe and the corresponding cup. The oil is collected in the hydraulic oil tank via rings, couplings, hoses, operation valves, and the like. Then, disconnect the connection between the coupling at the end of the hose and the corresponding coupling. Then, the cover is dropped to the lower cover position, the detecting means, for example, a switch is turned off, and the connection between the coupling and the corresponding coupling is detected, and the switching valve such as a solenoid valve is switched subsequently. In this way, the original state is restored.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments of the invention shown in the drawings. FIG. 1, FIG. 2,
3, 4, 5, etc. are provided for explaining the embodiment of the present invention. FIG. 1 is a side view at the normal time, and FIG. 2 is a side view at the time of unloading. FIG. 3 is a hydraulic circuit diagram during normal operation, and FIG. 4 is a hydraulic circuit diagram during unloading. FIG. 5 is a side view of the corresponding coupling, cover, switch, and the like. FIG. 5A shows a normal state, and FIG. 5B shows a state at the time of unloading.

First, the dump type tank trailer 15 will be described. This dump tank trailer 15
Is a trailer type in which a trailer 16 provided with a tank 1 is towed by a tractor 17 as shown in FIGS. The tank 1 is mounted on a chassis 18 of a trailer 16 and a hydraulic cylinder 5 is mounted between the front end portion and the chassis 18 so that the tank 1 is always in the horizontal position shown in FIG. It can be displaced to the dump posture tilted backward.

These will be described in more detail. First, the tractor 17 as a towing vehicle is provided with a cab 20 as a cab having wheels 19 at the front and a rear frame 21 with wheels 19. On the front portion of the rear frame 21 of the tractor 17, that is, on the cab back, various devices and pipes related to the hydraulic circuit such as the hydraulic oil tank 6 are arranged, and an air hose for brake is provided. (Not shown), and the tank 1 on the trailer 16 side is approaching from behind. On the rear of the rear frame 21 of the tractor 17, the front of the chassis 18 of the trailer 16 is pivotally supported via upper and lower couplers C including king pins. The tractor 17 and the trailer 16
Is connected to the trailer 16 under the rear portion of the chassis 18, and a rear wheel 19 is arranged. The tank 1 is mounted on the chassis 18 of the trailer 16.

The hydraulic cylinder 5 has one end pivotally attached to the front end of the tank 1 and the other end pivotally attached to the front of the chassis 18. Displaced between horizontal posture and dump posture. That is, chassis 1
In the illustrated example, the hydraulic cylinder 5 erected on the upper side 8 has a distal end of a piston rod 22, which is one end, and a pin 24, which is a left and right axis, attached to a mounting portion 23 which protrudes from the front end of the tank 1.
And the base end of the cylinder chamber 25, which is the other end, is pivotally connected to a mounting portion 26 protruding from the front of the chassis 18 of the trailer 16 by a pin 27 which is a left-right axis. ing. Note that, contrary to the illustrated example, an example in which the piston rod 22 is disposed below and the cylinder chamber 25 is disposed above is of course also possible. The hydraulic cylinder 5 in the illustrated example is a tank 1
Is mounted between the front surface of the front end of the vehicle and the front portion of the chassis 18.
May be mounted between the underside of the front end of the tank 1 and the chassis 18. For example, at the position near the tank receiver 28 described below, the distal end of the piston rod 22 of the hydraulic cylinder 5 is pivotally attached to the lower surface of the front end of the tank 1 and the base end of the cylinder chamber 25 of the hydraulic cylinder 5 is
It may be pivotally attached to the center of the chassis 18.

The lower portion of the tank 1 is pivotally supported on a rear portion of a chassis 18 by a dump hinge 4 serving as a left-right axis. Then, the tank 1 is supplied with oil to the hydraulic cylinder 5 to extend the piston rod 22, so that the front end side is lifted while using the dump hinge 4 as a fulcrum, and as shown in FIG. Take a posture. On the other hand, when the supply of the oil to the hydraulic cylinder 5 is released, the piston rod 22 is shortened by the weight of the tank 1, and the front end of the tank 1 is lowered with the dump hinge 4 as a fulcrum. Return to the normal horizontal position. In the figure, reference numeral 28 denotes a tank receiver. In the illustrated example, one or a plurality of the tank receivers 28 are disposed, for example, on the central portion of the undercarriage 18.
The upper surface has a curved shape corresponding to the tank 1 and functions to stably hold and receive in a horizontal posture.

In the illustrated example, the tank trailer 15 is used as a vehicle for transporting powder and granules, also called a bulk truck. Therefore, in the tank 1 on the tank trailer 15 serving as the powder and particle carrier, flour, carbon, and other powder and particles are loaded in a loosely dispersed state, and the tank 1 is loaded on the upper portion for loading. A manhole 2 is provided, and an outflow portion 3 is provided at the rear end. Tank 1
In addition to the above, cement, sand, rice, other cereals, chemical products, chemicals, and the like can be considered as the powder and granules loaded into the tank, and one of them is selected and loaded into the tank 1. .

The tank 1 is of a single-tank type made of stainless steel or other metal, and has a substantially cylindrical shape with front and rear portions closed. The loading and charging manhole 2 attached to the top of the tank 1 is composed of an opening and a lid, and although one is provided in the illustrated example, a plurality of manholes are often provided in the longitudinal direction. The outflow portion 3 is provided below the rear end of the tank 1 and includes a short cylindrical opening, an on-off valve, and the like. In the case of such a granular material carrier, the angle of the dump posture of the tank 1 is determined in consideration of the angle of repose of the granular material to be loaded.
For example, the angle is set to about 12.5 degrees or about 25 degrees. The dump type tank trailer 15 is configured as described above.

Hereinafter, the present invention will be described. The hydraulic circuit for extending and retracting the hydraulic cylinder 5 described above is configured, for example, as shown in FIGS. First, on the tractor 17 side, the hydraulic oil tank 6, the first pipe 29, the pump 7, the operating valve 8, the hose 30, the coupling 31, the fourth pipe 32, the receiving coupling 33, and the like are provided. ing.

These will be described in more detail. First, the hydraulic oil tank 6 serving as an oil tank is disposed on the rear frame 21 of the tractor 17. A first pipe 29 and a fourth pipe 32 made of pipe or hose are arranged in parallel between the hydraulic oil tank 6 and the operation valve 8.
9 is provided with a pump 7. The hose 30 is connected to the hydraulic oil tank 6 via the first pipe 29 and the like. In the illustrated example, the pump 7 and the operation valve 8 are arranged in series in the first pipe line 29 in order from the hydraulic oil tank 6 side.
1 is provided.

The pump 7 uses a vehicle engine (not shown). T. O. The apparatus 10 is driven to rotate.
That is, the vehicle engine has a P.O. T. O. A device 10 is provided. T.
O. A pump 7 is attached to the device 10 via a shaft or the like. Therefore, by driving the vehicle engine, the P.V. T. O. The pump 7 is driven to rotate via the device 10. The operating valve 8 is normally switched to the center position on the drawing or to the left position on the drawing as shown in FIG. The flow can be formed from the side toward the hydraulic oil tank 6 side. On the other hand, at the time of unloading, as shown in FIG.
With respect to the pipe line 29, a flow can be formed from the upstream side to the downstream side, that is, from the hydraulic oil tank 6 and the pump 7 side to the hose 30 side.

The coupling 31 is composed of a male adapter provided at the end of the hose 30, and is automatically switched to open when connected to the corresponding coupling 34 on the trailer 16 side and closed when not connected. In the illustrated example, the tractor 17
A receiving coupling 33 is provided on the rear frame 21. When the coupling 31 is not connected to the corresponding coupling 34, the coupling 31 is closed by the receiving coupling 33 by being connected to the receiving coupling 33 which is a female adapter. Is protected from dust. Further, in the illustrated example, the first pipeline 29 and the fourth pipeline 32 are arranged in parallel between the hydraulic oil tank 6 and the operation valve 8. The fourth pipe 32 may not be provided, and its function may be shared by the first pipe 29. The hydraulic circuit on the tractor 17 side includes the hydraulic oil tank 6, the first pipe line 29, the pump 7, the operation valve 8,
It includes a hose 30, a coupling 31, a fourth conduit 32, a receiving coupling 33, and the like.

Next, in the hydraulic circuit on the trailer 16 side,
Corresponding coupling 34, second conduit 35, accumulator 36, third conduit 37, check valve 38, switching valve 40 such as solenoid valve 39,
A detection means 42 such as a switch 41, a cover 43, and the like are provided.

These will be described in detail. First, the corresponding coupling 34 is formed of a female adapter connectable to the above-described coupling 31 on the tractor 17 side, and a pipe or a hose is provided between the corresponding coupling 34 and the cylinder chamber 25 of the hydraulic cylinder 5. A second conduit 35 is provided. The third conduit 37 is made of a pipe or a hose,
The pressure is accumulated from the middle of the second conduit 35 to the accumulator 36, and the accumulator 36 and the hydraulic cylinder 5 are arranged in parallel with the corresponding coupling 34. Third
A check valve 38 and a switching valve 40 are arranged in parallel in the conduit 37. As for the third conduit 37, the check valve 38 is connected from the accumulator 36 side to the corresponding coupling 34 side or the hydraulic cylinder 5
The flow can be formed only to the side. Switching valve 40
Is a normally open valve that can form a flow from the corresponding coupling 34 side or the hydraulic cylinder 5 side only to the pressure accumulator 36 side, as shown in FIG. In other words, as shown in FIG.
Corresponding coupling 34 side and hydraulic cylinder 5 side and accumulator 3
It is possible to switch between the side 6 and the closed state, that is, the state at the time of unloading when disconnected.

The detecting means 42 detects the presence or absence of connection between the coupling 31 and the corresponding coupling 34, and opens and closes the switching valve 40 based on the detection result. In the example shown,
A cover 43 is pivotally mounted on the front portion of the chassis 18, and the cover 43 is dropped in front of the corresponding coupling 34 as shown in FIGS. 1, 3, and 5 (1). The lower cover position and the upper retreat position lifted from the front of the corresponding coupling 34 as shown in FIG. 2, FIG. 4 and FIG. . In the illustrated example, the detecting means 42 comprises a switch 41. The switch 41 is turned off at the lower cover position of the cover 43, as shown in FIG. 1, FIG. 3 and FIG. Coupling 31 and corresponding coupling 3
The connection absence between the four is detected, and the solenoid valve 39 as the switching valve 40 is opened or continued. On the other hand, as shown in FIGS. 2, 4, and 5 (2), the cover 43 is turned on at the upper retreat position, and the coupling 31 and the corresponding coupling 3 are turned on.
The connection between the four valves is detected, and the solenoid valve 39 as the switching valve 40 is closed or disconnected.

The detection means 42, the cover 43, and the like will be described in more detail.
1, 3 and 5 (1) in FIG. 1, FIG. 3 and FIG. 4, it can be displaced to an upper retreat position inclined upward as shown in FIG. The cover 43 has a substantially L-shaped side cross-section, and is pivotally attached at its base end to the mounting portion 44. At the lower cover position, the front end is located in front of the corresponding coupling 34 so as to remove dust. At the upper evacuation position, it is located above the connected corresponding coupling 34 or coupling 31.

It should be noted that various patterns are conceivable as the mode of displacement between the lower cover position of the cover 43 and the upper retreat position. First, as the first pattern,
It is assumed that all operations are performed by manual operation, and that the operator, that is, the driver performs the positioning and fixing at the lower cover position of the cover 43, the positioning and fixing at the upper retreat position, and the displacement between them. Next, as a second pattern, only the displacement of the cover 43 from the lower cover position to the upper evacuation position, that is, lifting, is performed by the operator, that is, the driver, and the displacement from the upper evacuation position to the lower cover position is
A natural fall due to disconnection between the coupling 31 and the corresponding coupling 34 may be used. in this case,
The positioning and fixing of the cover 43 at the upper retreat position is performed by abutting and holding the tip of the cover 43 on the connected coupling 31, the corresponding coupling 34, the hose 30, and the like, and at the lower cover position. The positioning and fixing of the cover 43 are performed using the weight of the cover 43 and the attached stopper. In addition, various patterns are conceivable for the positioning and fixing of the cover 43 at the lower cover position, the positioning and fixing at the upper retreat position, and the displacement therebetween, but in any case, the lower cover position moves to the upper retreat position. Is performed by lifting the operator, that is, the driver. The cover 43 is configured as described above.

Next, in the illustrated example, an electric switch 41 is used as the detecting means 42 and an electromagnetic valve 39 is used as the switching valve 40, and a wiring 45 is provided between the switch 41 and the electromagnetic valve 39. Have been. First, the switch 41 is provided on a front portion of the chassis 18 via a mounting portion 46 and is disposed behind the cover 43 described above.

When the switch 41 first takes the lower cover position where the cover 43 has fallen as shown in FIGS. 1, 3 and 5 (1), the switch 41 comes into contact with the cover 43.
It is turned off by taking a horizontal posture without contact, and it is detected that the coupling 31 and the corresponding coupling 34 are not connected. That is, the disconnection between the coupling 31 and the corresponding coupling 34 is a condition for the cover 43 to take the lower cover position, and the switch 41 performs detection using this. In this case, the solenoid valve 39 is set to be open, that is, to continue to the accumulator 36. On the other hand, as shown in FIG. 2, FIG. 4 and FIG.
Takes a tilted posture that is abutted and contacted and pushed upward.
Thus, the connection between the coupling 31 and the corresponding coupling 34 is detected. That is, the connection condition between the coupling 31 and the corresponding coupling 34 is that the cover 43 is lifted to the upper evacuation position.
Detection is performed using this fact. In this case, the solenoid valve 39 is set to be closed, that is, to be switched off to the accumulator 36.

In FIGS. 1 and 2, reference numeral 47 denotes a panel.
The accumulator 36, the check valve 38, the solenoid valve 3
9 and so on. In the hydraulic circuit on the trailer 16 side, the corresponding coupling 34, the second conduit 35,
A pressure accumulator 36, a third conduit 37, a check valve 38, a switching valve 40 such as a solenoid valve 39, a detecting means 42 such as a switch 41, a cover 43, and the like are provided.

The present invention is configured as described above. Then, it becomes as follows. In the dump type tank trailer 15, first, the piston rod 22 of the hydraulic cylinder 5 is always in a shortened state, and the tank 1 mounted on the chassis 18 of the trailer 16 is always in a shortened state.
Is in a horizontal position on the tank receiver 28 (FIG. 1,
FIG. 3 and FIG. And tractor 1
The connection between the coupling 31 at the end of the hose 30 on the 7 side and the corresponding coupling 34 on the trailer 16 is disconnected, and the hose 30 and the coupling 31 are connected to the tractor 1.
The coupling 31 is housed on the side 7 and is connected to the receiving coupling 33, protected and closed. On the trailer 16 side, the cover 43 drops to the lower cover position to protect the corresponding closed coupling 34. The detection means 42 such as the switch 41 is off at the lower cover position of the cover 43 and the coupling 3
The connection absence between the first coupling 1 and the corresponding coupling 34 is detected, and the switching valve 40 such as the electromagnetic valve 39 is opened or continued.

Therefore, in the case where the oil remaining in the second conduit 35 and the third conduit 37 on the trailer 16 side expands due to the temperature rise in such a constant condition,
as follows. That is, the expanded oil, that is, the hydraulic pressure, is supplied to the second conduit 35, the third conduit 37, the open or continuous solenoid valve 39, etc., which form a closed circuit on the trailer 16 side when the corresponding coupling 34 is closed. The accumulator 36 is connected via the switching valve 40 and the like.
Collected and stored.

Now, in such a normal state,
In the tank 1 mounted on the chassis 18 of the trailer 16, for example, flour, carbon, and other powders are charged from the upper manhole 2 and loaded in a loosely dispersed state. Then, the tank trailer 15 is driven to the destination.

Next, when unloading at the destination, the whole state is changed from the normal state described above to the next state. First, the worker, that is, the driver, lifts the cover 43 on the trailer 16 side from the lower cover position to the upper retreat position, and then connects the coupling 31 at the tip of the hose 30 on the tractor 17 to the receiving coupling 33. Are disconnected and connected to the corresponding coupling 34 on the trailer 16 side (see FIGS. 2, 4, 5 and (2) in FIG. 5).

Then, on the trailer 16 side,
A detecting means 42 such as a switch 41 is turned on by the upper evacuation position of the cover, detects the connection between the coupling 31 and the corresponding coupling 34, and opens the switching valve 40 such as the solenoid valve 39 until the opening. That is, the connection is switched from the continuation to the closing or disconnection. Therefore, the high-pressure oil, that is, the oil pressure stored in the pressure accumulator 36 on the trailer 16 side during normal driving or the like, as described above, changes the third pipe line 37 and the check valve 3 based on the pressure.
8, second conduit 35, open corresponding coupling 34, open coupling 31, hose 30, operating valve 8, first conduit 29
Alternatively, the hydraulic fluid is collected in the hydraulic oil tank 6 on the tractor 17 side via the fourth conduit 32 and the like.

Thereafter, the operator, that is, the driver switches the operation valve 8 on the tractor 17 side (for example, switches from the position shown in FIG. 3 to the position shown in FIG. 4) and sets the pump 7 to the P.P. T. O. The apparatus 10 is driven to rotate. Then, the oil in the hydraulic oil tank 6 on the tractor 17 side is supplied to the first pipe line 29, the operating valve 8, the hose 30, the open coupling 3
1, the corresponding open / closed coupling 34, the second conduit 35, etc., through the cylinder chamber 2 of the hydraulic cylinder 5 on the trailer 16 side.
5 is supplied. As a result, the piston rod 22 of the hydraulic cylinder 5 extends from the previously shortened state, so that the tank 1 is moved rearward from the horizontal posture to the center on the dump hinge 4 below the rear end on the chassis 18 of the trailer 16. Is pushed up to the dump posture that was tilted. Then, the granular material or the like loaded in the tank 1 flows down and is unloaded from the outlet 3 at the rear end.

Next, at the destination,
When the unloading is completed, the operator, that is, the driver switches the operation valve 8 on the tractor 17 side (switches from the position shown in FIG. 4 to, for example, the position shown in FIG. 3). Then, on the trailer 16 side, due to the weight of the tank 1, the piston rod 22 of the hydraulic cylinder 5 is shortened from the extended state, and the tank 1 is lowered from the dumping posture to the original horizontal posture, 28. At the same time, the oil in the cylinder chamber 25 of the hydraulic cylinder 5 is discharged from the second pipe 35, the corresponding coupling 34 opened, the coupling 31 opened, the hose 30, the operating valve 8, the first pipe 2
The hydraulic fluid is collected in the hydraulic oil tank 6 on the tractor 17 side through the ninth or fourth pipeline 32 and the like.

Then, the operator, ie, the driver, connects the coupling 31 at the end of the hose 30 with the corresponding coupling 34.
Disconnect with Then, the cover 43 is dropped from the upper evacuation position to the lower cover position, whereby the detecting means 42 such as the switch 41 is turned off, and the absence of connection between the coupling 31 and the corresponding coupling 34 is detected.
The switching valve 40 such as 9 is opened, that is, continuously switched. In this way, from the state at the time of unloading until then (Fig. 2,
4 and 5 (see FIG. 2) and the like, and return to the original normal state (see FIGS. 1, 3 and 5 (1) and the like). Then, in this dump type tank trailer 15, the following first, second, third, fourth and fifth are performed.

First, in the tank trailer 15, only one hose 30 is disposed between the tractor 17 side and the trailer 16 side. In addition, the hose 30 on the tractor 17 side always has the coupling 31 at its tip as described above, except during unloading.
Is disconnected from the corresponding coupling 34 on the trailer 16 side, and is stored on the rear frame 21 of the tractor 17. For example, the tank trailer 15 used as a granular material transport vehicle has a relatively short overall length, but has a large capacity and a large diameter in the tank 1 due to loading of the granular material. The cabback on the rear frame 21 of the tractor 17 has such a large tank 1 approaching from behind, is extremely narrow in space, and is provided with an air hose for brakes and the like. And
For such a narrow cabback, the hose 30 is 1
Only books are provided, and this hose 30
Is always disconnected from the trailer 16 side,
It does not become an obstacle, and there is no need for space in production.

Second, in this tank trailer 15,
As described above, only one hose 30 is provided between the tractor 17 side and the trailer 16 side, and the cost is superior to the case where two hoses 30 are provided.

Thirdly, the one hose 30 is always connected to the coupling 31 and the corresponding coupling 34 on the trailer 16 side as described above, except during unloading.
Is disconnected, and is stored on the tractor 17 side. In the tank trailer 15, the trailer 16 towed by the tractor 17 swings in the left-right direction during traveling.
Is not connected to the trailer 16 side. Therefore,
A situation in which the hose 30 is liable to be damaged or broken due to swinging in the left-right direction during traveling, that is, half rotation in the left-right direction, is reliably avoided.

Fourth, in normal times other than when unloading, such as when traveling, the tank trailer 15 raises
The oil remaining in the second conduit 35 and the third conduit 37 on the trailer 16 side often expands. In such a case, the oil corresponding to the expansion, that is, the hydraulic pressure, is not directed to the hydraulic cylinder 5 side as described above, and the second pipeline 35 and the third pipeline 3 forming a closed circuit are not provided.
7, collected by the accumulator 36 via the switching valve 40 such as the electromagnetic valve 39 and stored. Therefore, for example, it is possible to reliably avoid the situation where the oil expands and the hydraulic pressure rises due to the temperature rise during traveling, and the hydraulic cylinder 5 is inadvertently extended and the tank 1 is pushed up.

Fifth, when unloading, the operator, for example, lifts the cover 43 to the upper evacuation position and unloads the coupling 31 at the end of the hose 30 as described above. After connecting to the coupling 34, it is only necessary to switch the operating valve 8 as described above. That is, as described above, when the connection between the coupling 31 and the corresponding coupling 34 is connected, the detecting means 42 such as the switch 41 automatically detects the connection, and the switching valve 40 such as the electromagnetic valve 39. Is switched to closed or disconnected in conjunction with. Then, the oil, that is, the oil pressure stored in the pressure accumulator 36 is transferred to the third pipe 37, the check valve 38, the second pipe 3
5, Collected in the hydraulic oil tank 6 via the corresponding coupling 34, the coupling 31, the hose 30, the operation valve 8, the first pipe 29 or the fourth pipe 32, and the like. Then, as described above, simply by switching the operation valve 8 and rotating the pump 7, the hydraulic cylinder 5 is extended, the tank 1 takes a dumping posture, and the unloading is performed.

Further, even after the unloading is completed, the operator, that is, the driver switches the operation valve 8 as described above, and then, as described above, the coupling 31 at the tip of the hose 30 as described above.
And only disconnect the connection with the corresponding coupling 34 on the trailer 16 side. That is, by switching the operation valve 8, the hydraulic cylinder 5 is shortened by the weight of the tank 1,
The tank 1 descends to a horizontal position, and the oil in the hydraulic cylinder 5 is collected in the hydraulic oil tank 6 on the tractor 17 side. Then, when the connection between the coupling 31 and the corresponding coupling 34 is released, the cover 43 automatically falls to the lower cover position, and the detecting means 42 such as the switch 41 detects this, and the electromagnetic valve Since the switching valve 40 such as 39 is switched to open or continuous, the oil, that is, the oil pressure in the accumulator 36 can be recovered and stored after the fact.

As described above, the operator, that is, the driver does not need to switch the switching valve 40 when unloading is started or unloaded. That is, at the time of unloading, the operator, that is, the driver only has to perform switching of the operation valve 8, connection and disconnection between the coupling 31 and the corresponding coupling 34, and the like.

First, in the illustrated example, the coupling 3
The presence or absence of connection between the coupling 1 and the corresponding coupling 34 is determined by the cover 4
3, the switching valve 40 composed of the solenoid valve 39 is opened and closed based on the detection. However, the present invention is not limited to this. 42 and the switching valve 40 can be used. For example, a method of directly detecting the detection means 42 with the switch 41 without passing through the cover 43 is also possible, and a method of using various sensors other than the switch 41 as the detection means 42 is also possible. Further, the detection means 42 using air pressure or oil pressure is adopted instead of the electric detection means 42, and based on this, the switching valve 40 is switched using air pressure or oil pressure. Is also conceivable.

Second, in the illustrated example, the tank trailer 15 is applied to a granular material carrier, but the tank trailer 15 of the present invention can also be applied to vehicles for other various uses. For example, the tank trailer 15 can be applied to a vehicle for a dump truck or a tank truck.

[0050]

As described above, the dump-type tank trailer according to the present invention has a hydraulic circuit for extending and retracting the hydraulic cylinder for tilting the tank.
A hydraulic oil tank, a first line, a hose, a pump, an operating valve, a coupling, etc. are provided, and a corresponding coupling, a second line, an accumulator, a third line, a check valve,
By providing a switching valve such as a solenoid valve, and detection means such as a switch, the following effects are exhibited.

First, there is no unreasonable space in manufacturing. That is, in this dump type tank trailer, only one hose is provided between the tractor side and the trailer side, and the hose on the tractor side is always used except when unloading. The connection between the coupling and the corresponding coupling on the trailer side is released and stored on the tractor side. Therefore, two hoses (main hose and return hose) are provided between the tractor side and the trailer, and one of them (return hose) is always interposed and connected so that it can rotate halfway in the left-right direction. As in the above-described conventional example of this kind, there is no possibility that the arrangement space makes the production impossible. In other words, the cabback on the rear frame of the tractor is extremely narrow in space, and an air hose for braking is also provided. In the present invention, however, the hose is always interposed and connected to such a narrow space. ， Not connected, there is no difficulty in production without getting in the way.

Second, the manufacturing cost is excellent. That is, in this dump type tank trailer, only one hose is disposed between the tractor side and the trailer side. Therefore, as compared with a case where two hoses (a main hose and a return hose) are provided as in the above-described conventional example, the manufacturing cost is reduced by the reduction of one hose. Excellent in manufacturing cost.

Third, hose damage and breakage accidents are also avoided. That is, in this dump type trailer, one hose is provided between the tractor side and the trailer side, and this hose is always connected between the coupling and the corresponding coupling on the trailer side. The connection is broken,
It is stored on the tractor side. Therefore, a hose (return hose) is always connected and connected between the tractor side and the trailer so as to be able to make a half turn in the left and right direction via a narrow cabback. The hose of the present invention is less susceptible to damage and breakage, and has excellent durability, as compared to the case where the hose was easily broken and breakage.

Fourth, accidents such as the tank being inadvertently pushed up or bounding due to a rise in temperature during running or the like are also prevented. That is, for example, at all times during traveling or the like, the oil remaining in the second pipeline and the third pipeline often expands as the temperature rises. In this case, the oil that has expanded in this way, that is, the hydraulic pressure, is not directed to the hydraulic cylinder side, but is collected and stored in the accumulator on the trailer side. Therefore, at all times other than the time of unloading, it is reliably prevented that the oil expands due to the temperature rise and the hydraulic pressure rises, and the hydraulic cylinder is inadvertently extended. Therefore, accidents in which the tank is inadvertently pushed up from the horizontal position to the dump position tilted can be avoided, and after the fact, the tank naturally returns from the dump position to the horizontal position, and the tank is returned to the tank holder on the chassis side of the trailer. Accidents that cause the tank to bounce and deform or damage the tank are also reliably avoided.

Fifth, these are easily realized by a simple operation. That is, when unloading, for example, the operator only has to lift the cover to the upper evacuation position, connect the coupling at the end of the hose to the corresponding coupling, and then simply switch the operation valve. That is, as soon as the connection between the coupling and the corresponding coupling is established, the detecting means detects this and automatically switches the switching valve to the closed or disconnected state, and the oil, that is, the oil pressure stored in the pressure accumulator is activated. Automatically collected in the oil tank. Further, even after the unloading is completed, the operator, that is, the driver may perform the operation of disconnecting the connection between the coupling at the end of the hose and the corresponding coupling after switching the operation valve. That is, when the connection between the coupling and the corresponding coupling is released, the cover is dropped to the lower cover position, and the detecting means detects this and automatically switches the switching valve to open, that is, the accumulator afterwards. The automatic recovery of the hydraulic pressure is possible. At the time of unloading or unloading, the switching of the switching valve is automatically performed in this way, and the operator, that is, the driver, only needs to perform a simple operation, and may forget to switch the switching valve. There is no fear to be. As described above, the effects exhibited by the present invention are remarkable and large, for example, all the problems existing in this type of conventional example are solved.

[Brief description of the drawings]

FIG. 1 is a side view of a dump-type tank trailer according to an embodiment of the present invention, which is always used for describing an embodiment of the invention.

FIG. 2 is a side view at the time of unloading for description of the embodiment of the present invention.

FIG. 3 is a diagram illustrating a hydraulic circuit at all times for explaining the embodiment of the present invention;

FIG. 4 is a hydraulic circuit diagram at the time of unloading for explanation of the embodiment of the present invention.

FIG. 5 is a side view of a corresponding coupling, a cover, a switch, and the like for explaining the embodiment of the present invention. FIG. 5A shows a normal state, and FIG. The state of is shown.

FIG. 6 is a hydraulic circuit diagram of a conventional example of this kind.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank 2 Manhole 3 Outflow part 4 Dump hinge 5 Hydraulic cylinder 6 Hydraulic oil tank 7 Pump 8 Operating valve 16 Trailer 17 Tractor 18 Undercarriage 29 First pipe 30 Hose 31 Coupling 34 Corresponding coupling 35 Second pipe 36 Accumulator 37 Third line 38 Check valve 39 Solenoid valve 40 Switching valve 41 Switch 42 Detecting means 43 Cover

Claims (3)

[Claims] 1. A trailer-type tank trailer in which a trailer having a tank is towed by a tractor, wherein the tank is mounted on a chassis of the trailer, and a hydraulic cylinder is provided between a front end and the chassis. The tractor has a hydraulic oil tank and a hydraulic oil tank on the tractor side, and can be displaced between a normal horizontal attitude and a dumping attitude tilted rearward during unloading. A hose, a pump and an operating valve arranged in series with the first conduit, and a coupling provided at a tip of the hose, and the coupling is provided on the trailer side. A corresponding coupling that can be connected to the second coupling, a second pipeline disposed between the corresponding coupling and the hydraulic cylinder, a third pipeline that branches from the middle of the second pipeline and reaches the pressure accumulator, Arranged in parallel to the third pipeline A check valve and a switching valve, and detection means for detecting the presence or absence of connection between the coupling and the corresponding coupling, and for opening and closing the switching valve based on a result of the detection. A dump type tank trailer characterized by the following. 2. A dump type tank trailer according to claim 1, wherein flour, carbon, and other powders are loaded in the tank in a loosely dispersed state. A manhole for loading is provided, and an outflow portion is provided at the rear end, a lower portion of the rear end is pivotally supported on a rear portion of the chassis by a dump hinge, and one end of the hydraulic cylinder is provided at the tank. And the other end is pivotally mounted on the front of the chassis, and the expansion and contraction moves the tank between a horizontal position and a dump position. The dumping type tank trailer, wherein the coupling and the corresponding coupling are respectively switched to open when connected to each other and closed when not connected to each other. 3. The dump-type tank trailer according to claim 1, wherein a cover is pivotally mounted on a front portion of the undercarriage, and wherein the cover is dropped in front of a corresponding coupling. And the upper coupling position lifted from the front of the corresponding coupling, the switching valve is composed of a solenoid valve, and the detection means is composed of a switch. It is off at the lower cover position, detects the absence of connection between the coupling and the corresponding coupling, and opens or continues the solenoid valve, and turns on at the upper retreat position of the cover to turn off the coupling and the coupling. A dump type tank trailer, characterized in that the connection between the corresponding couplings is detected to close or cut off the solenoid valve.