JP7244210B2 - Specially equipped vehicle with weighing function - Google Patents

Description

The present invention relates to specially equipped vehicles such as dump trucks, container trucks, garbage trucks, etc., which are equipped with a function of tilting a loading platform or a cargo box and a function of weighing.

A method of inclining a loading platform or a cargo box is widely known as a measure for discharging a load. Further, Patent Document 1 discloses a specially equipped vehicle equipped with a function of measuring the weight of a load.
The specially equipped vehicle disclosed in Patent Document 1 tilts the packing box to discharge the dust inside.
The specially equipped vehicle disclosed in Patent Document 1 has a tilting cylinder for tilting the packing box and a lifting cylinder for lifting one end of the packing box.
Furthermore, the specially-equipped vehicle disclosed in Patent Document 1 has a hydraulic control section for switching between the supply of hydraulic oil to the tilting cylinder and the supply of hydraulic oil to the lifting cylinder.
In the specially-equipped vehicle disclosed in Patent Document 1, a lifting cylinder is driven to slightly lift the packing box, and the weight of the packing box is measured by a load cell installed below the lifting cylinder.

That is, a lifting cylinder is placed on the top of the load cell, and when the lifting cylinder is extended, it engages with a hook provided in the dust collection chamber (packing box) to lift the dust collection chamber.
Thus, the weight of the load can be grasped by applying the load of the dust collection chamber onto the load cell.
Also, during traveling, the lifting cylinder is contracted and separated from the hook so that the load of the dust collection chamber is not applied to the load cell, and damage to the load cell can be prevented.

Japanese Patent Application No. 2006-52084

According to the configuration of Patent Document 1, load is applied to the load cell only during weight measurement, so failure of the load cell is less likely.
In addition, since the cargo box is supported by other parts during traveling, the cargo box is stable.
However, according to the structure disclosed in Patent Document 1, there is a concern that the weight may be erroneously detected.

As described above, the specially equipped vehicle disclosed in Patent Document 1 has a tilting cylinder for tilting the cargo bed and a lifting cylinder for lifting one end of the cargo box. The supply destination of the hydraulic oil pressurized by the hydraulic pump is switched by a hydraulic control unit such as a switching valve.
In the specially equipped vehicle disclosed in Patent Document 1, a hydraulic pump for extending and retracting the lifting cylinder is also connected to the tilting cylinder by a hydraulic control unit.
If hydraulic oil is fed into the tilting cylinder by mistakenly operating the switching valve when the lifting cylinder should be extended, the tilting cylinder will extend, and the dust collection chamber will be pushed by the tilting cylinder. The cylinder is loaded with the load of the dirt collection chamber. In an extreme case, the dust collection chamber is pushed by the tilting cylinder and floats up.
Moreover, when a manual valve is employed as the switching valve, hydraulic fluid may flow into an unexpected port during the switching process, and the tilting cylinder may move slightly.
Therefore, the weight of the load may not be accurately reflected on the load cell, and the weight of the load may not be accurately grasped.

SUMMARY OF THE INVENTION An object of the present invention is to provide a specially-equipped vehicle with a weighing function capable of more accurately measuring the weight of a load.

A mode for solving the above-described problems comprises a vehicle portion, a cargo bed or a cargo box attached to the vehicle portion, tilting means for tilting the cargo bed or the cargo box, and at least a part of the cargo bed or the cargo box. A specially equipped vehicle with a weighing function, which has a lifting mechanism for lifting and a weight measuring device, and measures the weight of the loading platform or the loading box with the weight measuring device while the loading platform or the loading box is lifted by the lifting mechanism, wherein the tilting means has a tilting cylinder and a tilting pump, and uses the tilting pump as a tilting side drive source to drive the tilting cylinder to change the attitude of the loading platform or the cargo box, and the lifting mechanism includes the tilting It is a specially-equipped vehicle with a weighing function, which is driven by a drive source separate from a pump for lifting a cargo bed or a cargo box.

In the specially equipped vehicle with weighing function of this aspect, a tilting cylinder is employed as an actuator for tilting the loading platform or the cargo box. A tilting pump is employed as a tilting-side drive source for driving a tilting cylinder, which is an actuator.
In this specification, a device that converts energy such as electrical energy and fluid energy such as hydraulic and pneumatic energy into motion is generically called an "actuator".
In the specially equipped vehicle with a weighing function of this aspect, the drive source for operating the lifting mechanism is different from the drive source for tilting the loading platform or packing box.
An example of the "driving source other than the tilting pump" is a hydraulic pump different from the tilting pump. Also, instead of the cylinder, a mechanical jack may be used to lift the loading platform or the like. When a mechanical jack is employed, a motor or the like for driving the jack serves as a drive source.
In the specially equipped vehicle with weighing function of this aspect, the lifting mechanism is operated by a drive source separate from the tilting pump to lift the cargo bed or cargo box. Therefore, it is less likely that the operator will operate the switching valve or the like erroneously, or that hydraulic fluid will flow into an unexpected flow path during switching. Therefore, the tilting cylinder will not extend. Therefore, the possibility of erroneously detecting the weight of the load is low.

In the above-described aspect, the vehicle portion runs using the engine as a power source for running, and has a power take-off device that extracts power from the power source for running, and the lifting mechanism includes a lifting cylinder and a lifting pump. The lifting pump is used as a driving source to drive a lifting cylinder to lift a loading platform or a cargo box, and one of the tilting pump and the lifting pump receives power transmission from the power take-off device. Preferably one is driven by the receiving and the other is driven by a motor.
A specific aspect for solving the above-described problems is a vehicle portion, a cargo bed or a cargo box attached to the vehicle portion, tilting means for tilting the cargo bed or the cargo box, and at least one of the cargo bed or the cargo box. A specially equipped vehicle with a weighing function, which has a lifting mechanism for lifting a part and a weight measuring device, and measures the weight of the loading platform or the loading box with the weight measuring device while the loading platform or the loading box is lifted by the lifting mechanism, The tilting means has a tilting cylinder and a tilting pump, and the tilting pump is used as a tilting side drive source to drive the tilting cylinder to change the attitude of the loading platform or the cargo box. It is operated by a drive source different from the tilting pump to lift a cargo bed or a cargo box. The lifting mechanism has a lifting cylinder and a lifting pump, and the lifting pump is used as a driving source to drive the lifting cylinder to lift the cargo bed or the cargo box. A specially equipped vehicle with a weighing function, wherein one of the pump for lifting and the pump for lifting is driven by power transmission from the power take-off device, and the other is driven by a motor.

In the specially equipped vehicle with weighing function of this aspect, a lifting pump is employed as a driving source (lifting side driving source) for operating the lifting mechanism. Since the lifting pump (lifting side drive source) is a separate pump from the tilting pump (tilting side driving source), the possibility of erroneously detecting the weight of the load is low.
Furthermore, in this aspect, the power source of the driving source is also different. That is, in this aspect, one of the drive sources is driven by the power take-off device as the power source, and the other is driven by the motor as the power source. For example, the tilting pump (tilting-side drive source) is driven by transmitting the power of the running engine, and the lifting pump (lifting-side drive source) is driven by a motor.
Therefore, the tilting means and the lifting mechanism are completely different in power source and power transmission system, and there is little concern that the tilting cylinder will be extended during weight measurement.

In the aspect described above, the vehicle section runs using the engine as a power source for running, and has a plurality of power take-off devices that extract power from the power source for running, and the lifting mechanism includes a lifting cylinder and a lifting pump. using the lifting pump as a driving source to drive a lifting cylinder to lift a loading platform or a cargo box, and the tilting pump and the lifting pump receive power transmission from different power takeoff devices It is also recommended to be driven by
A specific aspect for solving the above-described problems is a vehicle portion, a cargo bed or a cargo box attached to the vehicle portion, tilting means for tilting the cargo bed or the cargo box, and at least one of the cargo bed or the cargo box. A specially equipped vehicle with a weighing function, which has a lifting mechanism for lifting a part and a weight measuring device, and measures the weight of the loading platform or the loading box with the weight measuring device while the loading platform or the loading box is lifted by the lifting mechanism, The tilting means has a tilting cylinder and a tilting pump, and the tilting pump is used as a tilting side drive source to drive the tilting cylinder to change the attitude of the loading platform or the cargo box. It is operated by a drive source different from the tilting pump to lift a cargo bed or a cargo box. The lifting mechanism has a plurality of lifting mechanisms, and the lifting mechanism has a lifting cylinder and a lifting pump, and the lifting pump is used as a driving source to drive the lifting cylinder to lift the cargo bed or cargo box, The tilting pump and the lifting pump are specially equipped vehicles with metering functions, which are driven by receiving power transmission from different power take-off devices.

In each of the above-described modes, the tilt cylinder preferably has a bottom-side port and a rod-side port, and the bottom-side port and the rod-side port are preferably opened to the tank or to the atmosphere during weight measurement.

According to this aspect, the tilting cylinder has both the bottom side port and the rod side port opened, and cannot generate a pressing force or a contracting force. Therefore, the pressure of the tilting cylinder does not change the measured value of the weight measuring instrument.
Furthermore, since both the bottom side port and the rod side port are open, the cavity in the tilting cylinder is not closed and the rod can be freely moved by an external force. Therefore, the tilting cylinders are less likely to act as resistance when the loading platform or the like moves, and the weight of the load is more accurately reflected on the weight measuring device.

Another aspect for solving a similar problem is a vehicle portion, a cargo bed or cargo box attached to the vehicle portion, tilting means for tilting the cargo bed or cargo box, and at least the cargo bed or cargo box. A specially equipped vehicle with a weighing function that has a lifting mechanism that lifts a part and a weight measuring device, and measures the weight of the loading platform or the loading box with the weight measuring device while the lifting mechanism lifts the loading platform or the loading box, The tilting means has a tilt-side action mechanism that acts on the bed or the packing box to tilt the bed or the packing box, and a tilt-side drive source that drives the tilt-side action mechanism. It is a specially equipped vehicle with a weighing function, which is operated by a drive source different from the drive source and lifts a loading platform or a packing box.
A specific aspect for solving the above-described problems is a vehicle portion, a cargo bed or a cargo box attached to the vehicle portion, tilting means for tilting the cargo bed or the cargo box, and at least one of the cargo bed or the cargo box. A specially equipped vehicle with a weighing function, which has a lifting mechanism for lifting a part and a weight measuring device, and measures the weight of the loading platform or the loading box with the weight measuring device while the loading platform or the loading box is lifted by the lifting mechanism, The tilting means has a tilt-side action mechanism that acts on the bed or the packing box to tilt the bed or the packing box, and a tilt-side drive source that drives the tilt-side action mechanism. It is operated by a drive source separate from the power source and lifts the loading platform or packing box, the vehicle section runs using the engine as a power source for running, and has a power extraction device that extracts power from the power source for running, The lifting mechanism has a lifting cylinder and a lifting pump, and drives the lifting cylinder using the lifting pump as a driving source to lift the loading platform or the cargo box. A specially equipped vehicle with a metering function, wherein the source is a tilting pump, one of the tilting pump and the lifting pump is driven by power transmission from the power take-off device, and the other is driven by a motor. be.
Another specific embodiment comprises a vehicle portion, a cargo bed or cargo box attached to said vehicle portion, tilting means for tilting said cargo bed or cargo box, and a lifting device for lifting at least a portion of said cargo bed or cargo box. and a weight measuring device, wherein the weight of the loading platform or the cargo box is measured by the weight measuring device in a state where the loading platform or the loading box is lifted by the lifting mechanism, wherein the tilting means is the loading platform or It has a tilt-side action mechanism that acts on the cargo box to tilt the loading platform or the cargo box, and a tilt-side drive source that drives the tilt-side action mechanism, and the lifting mechanism is separate from the tilt-side drive source. It is operated by a drive source to lift a loading platform or a cargo box, the vehicle section runs using an engine as a power source for running, and has a plurality of power take-off devices for extracting power from the power source for running, and the lifting mechanism. has a lifting cylinder and a lifting pump, and uses the lifting pump as a driving source to drive the lifting cylinder to lift a loading platform or a cargo box. A specially equipped vehicle with a metering function is characterized in that the tilting pump and the lifting pump are driven by receiving power transmission from different power take-off devices.

For example, when a linearly driven actuator such as a cylinder is used as the tilting means or the lifting mechanism, and the actuator is extended and contracted to tilt or lift a packing box, the cylinder or the like is the tilting side action mechanism, A pump, compressor, or the like that supplies hydraulic or pneumatic pressure to the cylinder is the tilt-side drive source.
For example, when a rotating actuator such as a motor is used as a tilting means or a lifting mechanism, and a screw or a link mechanism converts the rotational motion into a linear motion to tilt or lift a packing box, the screw or the link mechanism is used. This is the tilt side action mechanism, and the motor or the like that moves these is the tilt side drive source.

Another aspect for solving a similar problem is a vehicle portion, a cargo bed or cargo box attached to the vehicle portion, tilting means for tilting the cargo bed or cargo box, and at least the cargo bed or cargo box. It has a lifting mechanism that lifts a part and a weight measuring device, and has a weighing function that measures the weight of the loading platform or the loading box with the weight measuring device while part of the loading platform or the loading box is lifted by the lifting mechanism. In the specially-equipped vehicle, the tilting means has a tilting cylinder and a tilting pump, and the tilting pump is used as a driving source to drive the tilting cylinder to change the attitude of the loading platform or the cargo box, and the tilting cylinder is a specially equipped vehicle with a weighing function, which has a bottom side port and a rod side port, and is characterized in that the bottom side port and the rod side port are opened to the tank or to the atmosphere during weight measurement.

According to this aspect, the pressure of the tilting cylinder does not change the measured value of the weight measuring instrument. In addition, the tilting cylinders are less likely to resist the movement of the loading platform and the like, and the weight of the load is more accurately reflected on the weight measuring device.

According to the specially equipped vehicle with a weighing function of the present invention, the weight of the load can be measured more accurately.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view of the special purpose vehicle with a weighing function of embodiment of this invention, (a) shows the state at the time of driving|running|working, (b) shows the state which made the packing box incline. FIG. 2 is a front view showing a specially equipped device of the specially equipped vehicle with a weighing function in FIG. 3 is a perspective view showing the periphery of a lifting cylinder and the periphery of a locking piece of a packing box of the specially equipped device of FIG. 2; FIG. (a) is a front view of the specially equipped device of FIG. 2, and (b) is a side view thereof, showing a state during running. (a) is a front view of the specially equipped device of FIG. 2, and (b) is a side view thereof, showing a state during weight measurement. FIG. 2 is a conceptual diagram showing a piping system, a power transmission system, and a signal system of the specially equipped vehicle with a weighing function in FIG. 1; FIG. 7 is a conceptual diagram of FIG. 6 and shows a running state. It is a conceptual diagram of FIG. 6 and shows a state in the middle of inclining the packing box. FIG. 7 is a conceptual diagram of FIG. 6 and shows a state in which the packing box is stopped in an inclined state. It is a conceptual diagram of FIG. 6, and shows a state in the middle of returning the packing box from the inclined state to the flat posture. FIG. 7 is a conceptual diagram of FIG. 6 showing a state in which the packing box is being lifted by the lifting cylinders in preparation for weighing. FIG. 7 is a conceptual diagram of FIG. 6 showing a state during weight measurement. FIG. 7 is a conceptual diagram of FIG. 6 and shows a state in the middle of returning to a running posture after finishing weight measurement. FIG. 6 is a conceptual diagram showing a piping system, a power transmission system, and a signal system of a specially equipped vehicle with a weighing function according to another embodiment of the present invention;

Embodiments of the present invention will be further described below. In the following description, the front-to-rear relationship corresponds to the front and rear of the vehicle, the cabin side being the front, and the rear flap 32 side being the rear.
A specially equipped vehicle 1 with a weighing function of this embodiment is a dump truck with a weighing function. In the following description, the specially equipped vehicle 1 with weighing function may be simply referred to as the specially equipped vehicle 1 in some cases.
The specially equipped vehicle 1 of the present embodiment is a dump truck as described above, and the specially equipped device 3 is mounted on the truck vehicle (vehicle portion) 2 .

The truck vehicle 2 has a cabin portion 5 and a pedestal portion 6 in the same manner as a well-known one, and has running wheels 7 which are rotated to self-propel.
As is well known, an engine 10 is mounted inside the truck vehicle 2 , and the rotational force of the engine 10 is transmitted to the running wheels 7 via a transmission 11 and a drive shaft 13 .
The truck vehicle 2 also has a plurality of power take-off devices 12 . The power take-off device 12 is a device called a PTO (Power Take-Off), and is a device that takes out the torque of the engine 10 to the outside.
The PTO includes a front PTO, a side PTO, a transfer PTO, a flywheel PTO, and the like. Since these structures are well-known, detailed description is omitted.

Next, the specially equipped device 3 will be described.
As shown in FIG. 2, the specially equipped device 3 is composed of a subframe 20, a swinging portion 21, a tilting means 22, a lifting mechanism 23, weight measuring devices 25 and 26, and others.
The subframe 20 functions as a fixing portion fixed to the gantry portion 6 of the truck vehicle 2, and is a frame made of steel.

The swinging part 21 is composed of a sturdy main girder 30 and a packing box 31 attached thereto. The packing box 31 is that of a known dump truck, is a box with an open top, and is provided with a rear flap 32 that can be opened and closed at the rear end.

In this embodiment, a receiving member 40 is attached to the front end portion of the swinging portion 21 .
As shown in FIGS. 3, 4 and 5, the receiving member 40 has a gate shape, and includes a horizontally provided contact plate 41 and support walls 42 provided at both ends thereof.
The upper portions of the support walls 42 are bent inward, and the receiving member 40 has a substantially trapezoidal shape. Therefore, the width of the contact plate 41 of the receiving member 40 is narrower than the interval between the lower portions of the support walls 42 .

The tilting means 22 is composed of a tilting cylinder 33 and an auxiliary support member 32 . The tilting cylinder 33 is a hydraulic cylinder that functions as a tilting-side action mechanism, and has a bottom-side port 36 and a rod-side port 37 (FIG. 6) similar to a known one. causes the rod 38 to extend.

As shown in FIG. 2 , the swinging portion 21 is fixed to both the left and right sides of the rear end of the sub-frame 20 via hinges 27 . Therefore, the swinging portion 21 swings around the hinge 27 and can take a horizontal posture and an inclined posture.
In this embodiment, a weight measuring device 25 is interposed between the hinges 27 provided on both left and right sides and the sub-frame 20 . Weight measuring device 25 is a load cell. In this embodiment, the structure is such that a hinge 27 is placed on the weighing device 25 .

A tilting means 22 is attached between the back side of the swinging portion 21 and the sub-frame 20 . The mounting structure of the tilting means 22 is the same as a known one, and the rod 38 side is mounted to the swinging portion 21 via a pin (not shown). The bottom side of the tilting means 22 is fixed to the sub-frame 20 via a pin (not shown).
Therefore, when hydraulic oil is introduced into the bottom side port 36 of the tilting cylinder 33 and the rod 38 is extended, the front side of the packing box 31 is lifted around the hinge 27 as shown in FIG.

The lifting mechanism 23 has a lifting cylinder 45 . The lifting cylinder 45 is a hydraulic cylinder that functions as a lifting side action mechanism.
The lifting mechanism 23 is fixed to the center of the front end side of the sub-frame 20 via a base member 43 and a weight measuring device (load cell) 26, as shown in FIG. In this embodiment, the structure is such that a lifting cylinder 45 is mounted on the weight measuring device 26 .
The pedestal member 43 has a horizontal beam 47 over the upper surfaces of the front ends of the two vertical girders 46 of the subframe 20, and a pedestal plate 48 is attached thereon.
A weight measuring device 26 is mounted on a base plate 48, and a lifting cylinder 45 as the lifting mechanism 23 is mounted thereon. The bottom side of the lifting mechanism 23 is fixed to the base member 43, and the rod 50 extends and contracts in the vertical direction.
The rod 50 of the hydraulic cylinder of the lifting mechanism 23 is positioned below the receiving member 40 described above.

Next, the piping system, power transmission system and signal system of the specially equipped vehicle 1 will be described with reference to FIG.
The piping system of the specially equipped vehicle 1 is roughly divided into an inclination system 51 and a lifting system 52 .
The tilting system 51 is a piping circuit that supplies hydraulic oil to the tilting cylinder (tilting side action mechanism) 33 , and the lifting system 52 operates the lifting cylinder (lifting side action mechanism) 45 of the lifting mechanism 23 . This is a piping circuit that supplies oil.

The tilting system 51 has a hydraulic oil tank 60, a tilting pump (tilting-side drive source) 61, a switching valve 62, a flow control valve 63, and a check valve 68, as shown in FIG.
The switching valve 62 is a manual 3-position 3-port valve.
The switching valve 62 has a first port 65 , a second port 66 and a third port 67 . The first position (left side) of switching valve 62 is the position where all ports are closed.
At the second position (center), the first port 65 and the second port 66 are in communication, and the third port 67 is closed. The third position (right side) communicates with all ports.

The tilting pump 61 functions as a tilting-side drive source that drives the tilting cylinder (tilting-side action mechanism) 33 . The tilting pump 61 is connected to the hydraulic fluid in the hydraulic fluid tank 60 via a suction pipe 70 on the suction side.
The discharge side of the tilting pump 61 is connected to the first port 65 of the switching valve 62 by a discharge side pipe 71 .
A second port 66 of the switching valve 62 is connected to hydraulic fluid in the hydraulic fluid tank 60 via a return line 72 .
A third port 67 of the switching valve 62 is connected to the bottom side port 36 of the tilting cylinder 33 via a hydraulic inlet/outlet pipe 73 . A flow control valve 63 is provided in the hydraulic inlet/outlet pipe 73 .

A bypass pipe 75 is provided between the hydraulic inlet/outlet pipe 73 and the discharge side pipe 71 , and the bypass pipe 75 is provided with a check valve 68 . The check valve 68 is mounted in a direction that allows the flow from the tilting pump 61 toward the bottom side port 36 of the tilting cylinder 33 and blocks the reverse flow.
The rod-side port 37 of the tilting cylinder 33 is connected to the hydraulic oil tank 60 by a pipe (not shown). The rod-side port 37 of the tilting cylinder 33 may be open to the atmosphere.

Next, the lifting system 52 will be explained.
The lifting system 52 is a piping circuit that supplies hydraulic oil to the lifting cylinder 45 .
The lifting system 52 has a circuit configuration very similar to that of the inclination system 51 described above, and as shown in FIG. 83 , check valves 88 , 76 and relief valve 57 .
The switching valve 82 is an electromagnetic 3-position 3-port valve.
The switching valve 82 has a first port 85 , a second port 86 and a third port 87 . The first position (left side) of switching valve 82 is the position where all ports are closed.
At the second position (center), the first port 85 and the second port 86 are in communication, and the third port 87 is closed. The third position (right side) communicates with all ports.

A suction side of the lifting pump 81 is connected to the hydraulic oil in the hydraulic oil tank 80 via a suction pipe 96 .
The discharge side of the lifting pump 81 is connected to the first port 85 of the switching valve 82 by a discharge side pipe 91 .
A second port 86 of the switching valve 62 is connected to hydraulic fluid in the hydraulic fluid tank 80 via a return line 92 .
A third port 87 of the switching valve 82 is connected to the bottom side port 28 of the lifting cylinder 45 of the lifting mechanism 23 via a hydraulic inlet/outlet pipe 93 .
A bypass pipe 95 is provided between the hydraulic inlet/outlet pipe 93 and the discharge side pipe 91 , and the bypass pipe 95 is provided with a check valve 88 . The check valve 88 is mounted in a direction that allows the flow from the lifting pump 81 toward the bottom side port 28 of the lifting cylinder 45 and blocks the reverse flow.

A check valve 76 is provided in the discharge side pipe 91 . The check valve 76 allows flow from the lifting pump 81 toward the switching valve 82 and prevents the reverse.
The relief valve 57 is provided between the discharge-side pipe 91 and the return pipe 92 to keep the pressure of the discharge-side pipe 91 constant.

Next, the power transmission system of the specially equipped vehicle 1 will be described.
As described above, the rotational force of the engine 10 is transmitted to the running wheels 7 via the transmission 11 and the drive shaft 13 .
In this embodiment, there are a plurality of power takeoff devices 12 as described above, and the tilting pump 61 of the tilting system 51 receives power transmission from one of the power takeoff devices 12 to rotate. Specifically, the tilting pump 61 rotates by receiving power transmission from the side PTO.
That is, as shown in FIG. 6, power is transmitted from the power take-off device (side PTO) 12 by the power transmission mechanism 58, and the tilting pump 61 rotates. The specific configuration of the power transmission mechanism 58 is not limited, and includes, for example, shafts, belts, chains, gears, and the like.

On the other hand, the lifting pump 81 of the lifting system 52 has a dedicated motor 15 and receives power from the motor 15 to rotate. Note that the motor 15 rotates by being supplied with power from a storage battery 16 mounted on the truck vehicle 2 .

As described above, in the specially equipped vehicle 1 of the present embodiment, the tilt side drive source of the tilt means is the tilt pump 61, and the lifting side drive source of the lifting mechanism 23 is the lifting pump 81, and the two drive sources are different. do.
Further, in the specially equipped vehicle 1 of the present embodiment, the power source of the tilting pump (tilting side drive source) 61 of the tilting means is the power take-off device 12, and the lifting pump (lifting side drive source) 81 of the lifting mechanism 23 is The power source is the motor 15, and both power sources are also different.

Next, the signal system of the specially equipped vehicle 1 will be described.
The specially equipped vehicle 1 has a weight display device 17, an operation switch 18, and a control device 53 as electronic devices.
The lifting cylinder 45 is also provided with proximity switches 55 and 56 for detecting the extension/contraction state of the rod.
The weight display device 17 displays the weight of the load in the packing box 31 based on the signal from the weight measuring device (load cell) 25 .
The control device 53 receives a signal from the operation switch 18 and operates to switch the switching valve 82 of the lifting system 52 .

Next, functions of the specially equipped vehicle 1 will be described with reference to FIGS. 7 to 12. FIG.
The specially-equipped vehicle 1 of the present embodiment can travel with the cargo box 31 in a horizontal position as shown in FIG. 7, and can discharge the load inside with the cargo box 31 in an inclined position as shown in FIG.
7, after the packing box 31 is placed in a horizontal position, the packing box 31 is lifted by the lifting cylinder 45 as shown in FIGS. can be measured.

FIG. 7 shows the state of the specially equipped vehicle 1 during normal times and during running. Neither the tilting means 22 nor the lifting mechanism 23 function during normal times or during running.
Specifically, the tilting pump 61 of the tilting system 51 is stopped. That is, the clutch (not shown) of the power take-off device 12 is disengaged, and the tilting pump 61 is stopped.
Also, the switching valve 62 is maintained at the third position as shown in FIG.
As a result, the hydraulic pressure in the piping of the tilt system 51 disappears.
The switching valve 62 is maintained at the third position, and the flow path from the bottom side port 36 of the tilting cylinder 33 to the hydraulic oil tank 60 is opened. Therefore, the hydraulic fluid in the bottom side port 36 of the tilting cylinder 33 returns to the hydraulic fluid tank 60 via the switching valve 62, the front end side descends, and the horizontal posture is maintained.

The same applies to the lifting system 52, and the lifting pump 81 is stopped. That is, the motor 15 is not energized and the lifting pump 81 is stopped.
As a result, the hydraulic pressure in the piping of the lifting system 52 disappears.
Also, the switching valve 82 is maintained at the third position by the operation switch 18 and the control device 53 .
The switching valve 82 is maintained at the third position, opening the flow path from the bottom side port 28 of the lifting cylinder 45 to the hydraulic oil tank 80 . Therefore, the hydraulic oil in the bottom side port 28 of the lifting cylinder 45 returns to the hydraulic oil tank 80 via the switching valve 82, and the rod 50 of the lifting cylinder 45 maintains the contracted state.

As a result of the contraction of the rod 50 of the lifting cylinder 45, the overall length of the lifting cylinder 45 is shortened, and the tip of the rod 50 leaves the contact plate 41 of the receiving member 40 as shown in FIGS.
The bottom of the swinging portion 21 is in contact with the subframe 20, and the swinging portion 21 and the packing box 31 provided on the swinging portion 21 are stabilized in a horizontal posture.
When the cargo box 31 settles into a predetermined horizontal posture, a lamp (not shown) in the cab lights up to inform the driver that the vehicle is ready to travel.

When tilting the packing box 31 of the specially equipped vehicle 1, the tilting means 22 is driven as shown in FIG. Lifting mechanism 23 is not activated.
Specifically, the tilting pump 61 of the tilting system 51 is driven. That is, the clutch (not shown) of the power take-off device 12 is engaged, and the power is transmitted to drive the tilting pump 61 .
As a result, hydraulic pressure is generated in the piping of the tilt system 51 .

After that, the switching valve 62 is switched to the first position.
By switching the switching valve 62 to the first position, the flow path to the bottom side port 36 of the tilting cylinder 33 via the switching valve 62 is blocked, but the check valve 68 of the bypass pipe 75 is closed for tilting. Allows flow from the pump 61 toward the bottom port 36 of the tilting cylinder 33 . Therefore, hydraulic fluid pressurized by the tilting pump 61 is supplied to the bottom side port 36 of the tilting cylinder 33 via the bypass pipe 75 , and the rod 38 extends to tilt the packing box 31 .

The lifting system 52 keeps the lifting pump 81 stopped and the switching valve 82 in the second position.
As a result, the rod 50 of the lifting cylinder 45 remains retracted.

When discharging the load, the cargo box 31 of the specially equipped vehicle 1 is maintained in an inclined state.
In order to maintain the posture of the packing box 31 in the tilted posture, the tilting means 22 is continuously driven and the switching valve 62 is switched to the second position as shown in FIG.
By switching the switching valve 62 to the second position, the flow path from the bottom side port 36 of the tilting cylinder 33 to the hydraulic fluid tank 60 is closed. Also, the check valve 68 of the bypass pipe 75 blocks the flow from the bottom side port 36 of the tilting cylinder 33 toward the hydraulic oil tank 60 . Therefore, the flow path from the bottom side port 36 of the tilting cylinder 33 to the hydraulic oil tank 60 is completely closed, and the hydraulic oil accumulated on the bottom side of the tilting cylinder 33 cannot escape. As a result, the rod 38 of the tilting cylinder 33 maintains its extended state, and the packing box 31 maintains its tilted posture.
The hydraulic fluid discharged from the tilting pump 61 passes through the switching valve 62 and returns to the hydraulic fluid tank 60 .

When the packing box 31 in the tilted posture is returned to the horizontal posture, as shown in FIG. 10, neither the tilting means 22 nor the lifting mechanism 23 are operated.
Specifically, the tilting pump 61 of the tilting system 51 is stopped. That is, the clutch (not shown) of the power take-off device 12 is disengaged, and the tilting pump 61 is stopped.
Also, the switching valve 62 is switched to the third position.
As a result, the hydraulic pressure in the piping of the tilt system 51 disappears.
By switching the switching valve 62 to the third position, the flow path from the bottom side port 36 of the tilting cylinder 33 to the hydraulic fluid tank 60 is opened. Therefore, the hydraulic oil in the bottom side port 36 of the tilting cylinder 33 returns to the hydraulic oil tank 60 via the switching valve 62, the front end side descends, and the packing box 31 returns to the horizontal posture.
Hydraulic oil flows from the tilting cylinder 33 to the hydraulic oil tank 60 via the hydraulic inlet/outlet pipe 73 . Since the hydraulic inlet/outlet pipe 73 is provided with the flow control valve 63, the flow rate of the hydraulic oil discharged from the tilting cylinder 33 is regulated, and the rod 38 slowly contracts. Therefore, the packing box 31 slowly returns to the horizontal posture.
In the present embodiment, the packing box 31 is returned to the horizontal position while the tilting pump 61 is stopped, but the tilting pump 61 may be maintained in a driven state.

The lifting system 52 keeps the lifting pump 81 stopped and the switching valve 82 at the second position.
As a result, the rod 50 of the lifting cylinder 45 is in a contracted state, and the contact plate 41 of the receiving member 40 does not collide with the rod 50 of the lifting cylinder 45 even if the swinging portion 21 descends. The bottom of the swinging portion 21 contacts the sub-frame 20, and the swinging portion 21 and the packing box 31 provided on the swinging portion 21 assume a horizontal posture.

Next, the operation for measuring the weight of the load will be described.
When measuring the weight of the load, the state shown in FIG. 12 is assumed after passing through the state shown in FIG. Prior to weight measurement, the tilting means 22 is stopped and the lifting mechanism 23 is activated as shown in FIG.
That is, the tilting pump 61 of the tilting system 51 is kept stopped. Specifically, the clutch (not shown) of the power take-off device 12 is disengaged, and the tilting pump 61 is stopped.
Also, the switching valve 62 is switched to the third position.

On the other hand, as for the lifting system 52 , the control device 53 activates the lifting pump 81 due to the operation of the operation switch 18 . That is, power is supplied from the storage battery 16 to the motor 15 to rotate the motor 15 and drive the lifting pump 81 . As a result, hydraulic pressure is generated in the piping of the lifting system 52 .
After that, the controller 53 switches the switching valve 82 to the first position.

By switching the switching valve 82 to the first position, the flow path to the bottom side port 28 of the lifting cylinder 45 via the switching valve 82 is blocked, but the check valve 88 of the bypass pipe 95 remains open. Allows flow from the upward pump 81 toward the bottom port 28 of the lifting cylinder 45 . Therefore, the hydraulic oil pressurized by the lifting pump 81 is supplied to the bottom side port 28 of the lifting cylinder 45 via the bypass pipe 95, and the rod 50 extends to extend the contact plate 41 of the receiving member 40. come into contact with
The rod 50 further extends to push up the contact plate 41 of the receiving member 40 and lift the front end of the swinging portion 21 slightly.

Here, since the rod 38 of the tilting cylinder 33 is connected to the bottom surface of the swinging portion 21, the tilting cylinder 33 receives an external force in the extending direction.
In this embodiment, the tilting pump 61 of the tilting system 51 is stopped and the switching valve 62 is switched to the third position.
Since the switching valve 62 is switched to the third position, the flow path from the hydraulic oil tank 60 to the bottom side port 36 of the tilting cylinder 33 via the switching valve 62 and the hydraulic inlet/outlet pipe 73 is opened.
Furthermore, a flow path from the hydraulic oil tank 60 to the first port 65 through the second port 66 of the switching valve 62 and to the bottom side port 36 of the tilting cylinder 33 via the bypass pipe 75 is also opened. The check valve 68 of the bypass pipe 75 allows the flow from the hydraulic oil tank 60 toward the bottom side port 36 of the tilting cylinder 33 .

Therefore, when the tilting cylinder 33 receives an external force in the extension direction, the bottom side cavity of the tilting cylinder 33 tends to have a negative pressure, and the hydraulic oil in the hydraulic oil tank 60 is sucked up to fill the bottom side cavity of the tilting cylinder 33. .
Therefore, when the lifting cylinder 45 is extended to lift the front end of the rocking portion 21, the tilting cylinder 33 does not have an excessively large load.

When the lifting cylinder 45 extends to the upper limit or a predetermined length and the proximity switch 55 attached to the lifting cylinder 45 detects this state, the control device 53 causes the switching valve 82 to switch to the first position as shown in FIG. Can be switched to two positions. The switching valve 82 is an electromagnetic valve and is automatically switched by a signal from the control device 53 .
By switching the switching valve 82 to the second position, the flow path from the bottom side port 28 of the lifting cylinder 45 to the hydraulic oil tank 80 is closed. Also, the check valve 88 of the bypass pipe 95 blocks the flow from the bottom side port 28 of the lifting cylinder 45 toward the hydraulic oil tank 80 . Therefore, the flow path from the bottom side port 28 of the lifting cylinder 45 to the hydraulic oil tank 80 is completely closed, and the hydraulic oil accumulated on the bottom side of the lifting cylinder 45 cannot escape. As a result, the rod 50 of the lifting cylinder 45 remains extended and the front end of the swinging portion 21 continues to be supported by the lifting cylinder 45 .
Hydraulic oil discharged from the lifting pump 81 passes through the switching valve 82 and returns to the hydraulic oil tank 80 .

After that, power supply to the motor 15 is stopped, and the lifting pump 81 is stopped. It should be noted that the motor 15 is automatically stopped by a signal from the control device 53 .
As a result of stopping the power supply to the motor 15, the hydraulic pressure in the piping of the lifting system 52 disappears, but the switching valve 82 maintains the state of the second position, so the rod 50 of the lifting cylinder 45 is Maintaining the extended state, the front end of the swinging portion 21 continues to be supported by the lifting cylinder 45 .
Also, the tilting cylinder 33 is connected to the swinging portion 21, but since the rod side port 37 and the bottom side port 36 of the tilting cylinder 33 are both open to the hydraulic oil tank 60, the swinging portion 21 The load applied to is substantially constant.

Therefore, the weight of the swinging portion 21, the weight of the tilting cylinder 33, etc., and the weight of the load in the packing box 31 are all It hangs on the upward cylinder 45 .
A load applied to the hinge 27 is detected by a weight measuring device 25 thereunder.
Further, the load applied to the lifting cylinder 45 is detected by the weight measuring device 26 below. Therefore, the total weight of the self weight of the swinging part 21, the weight of the tilting cylinder 33 and the like, and the weight of the load in the packing box 31 is the weight detected by the weight measuring device 25 under the hinge 27 and the lifting weight. It is the total weight detected by the weight measuring device 26 under the cylinder 45 .
Here, the weight of the swinging portion 21 and the weight of the tilting cylinder 33 are constant, and the fluctuating load is only due to the weight of the load in the packing box 31 . Also, the weight of the swinging portion 21 and the weight of the tilting cylinder 33 and the like are known. Therefore, the weight of the load is calculated by subtracting the known weight from the sum of the weights detected by the weighing devices 25,26.
In this embodiment, the weight of the load is displayed on the weight display device 17 .

In addition, in the case of loading a cargo box 31 in an empty state and measuring its weight, the weight of the cargo box 31 and the like is measured before loading the cargo, and the cargo is put in after taring. .

When the weight detection is finished, as shown in FIG. 13, the tilting means 22 and the lifting mechanism 23 are kept stopped, and the switching valve 62 of the tilting system 51 and the switching valve 82 of the lifting system 52 are both set to the third position. switch.
In the tilting system 51 , a flow path is opened from the bottom side port 36 of the tilting cylinder 33 to the hydraulic oil tank 60 , and the hydraulic oil in the bottom side port 36 of the tilting cylinder 33 passes through the switching valve 62 . Return to hydraulic oil tank 60 .
The same applies to the lifting system 52, and the flow path from the bottom side port 28 of the lifting cylinder 45 to the hydraulic oil tank 80 is opened, and the hydraulic oil in the bottom side port 28 of the lifting cylinder 45 is switched. It returns to hydraulic fluid tank 80 via valve 82 .
Therefore, the packing box 31 returns to the horizontal posture by its own weight.

In the specially-equipped vehicle 1 of the present embodiment, it is the tilting pump 61 that supplies hydraulic fluid to the tilting cylinder (tilting side working mechanism) 33 , and supplies hydraulic fluid to the lifting cylinder (lifting side working mechanism) 45 . Since it is the lifting pump 81, even if the switching valve 62 is erroneously operated or hydraulic oil flows into an unexpected port during the switching process, the detection result is not affected so much.
In addition, in the specially equipped vehicle 1 of the present embodiment, the piping system (tilting system 51) that drives the tilting cylinder (tilting side action mechanism) 33 and the piping system (lifting system) that drives the lifting cylinder (lifting side action mechanism) 45 Since the system 52) is independent, even if the switching valve 62 is erroneously operated, the effect on the detection result is small.
Further, in the specially equipped vehicle 1 of the present embodiment, the power source of the tilt side drive source (tilt pump 61) is the power take-off device 12, and the power source of the lift side drive source (lift pump 81) is the motor 15. Furthermore, since the power transmission paths of both are different, even if the switching valve 62 is erroneously operated, the effect on the detection result is small.

In the embodiment described above, the tilt side drive source (tilt pump 61) of the tilt system 51 is rotated by power transmission from the side PTO, and the lifting side drive source (lift pump 81) of the lifting system 52 is driven by the motor. 15.
The present invention is not limited to this configuration, and as shown in FIG.
Also, both the tilting side drive source (tilting pump 61) and the lifting side driving source (lifting pump 81) may be rotated by a motor.
For example, when the vehicle unit is an electric vehicle, both the tilt side drive source (tilt pump 61) and the lift side drive source (lift pump 81) are rotated by a motor.
At this time, the tilting side drive source (tilting pump 61) and the lifting side driving source (lifting pump 81) may be rotated by different motors.
When the vehicle part is an electric vehicle, a motor rotates a cam, a crank, a screw, a pantograph mechanism and other mechanical lifting mechanisms without using hydraulic pressure.
Alternatively, a generator may be mounted to drive each section with electric power generated by the generator.

The specially equipped vehicle 1 with a weighing function described above is a dump truck, and the cargo box 31 is directly attached to the vehicle portion 2, and the cargo box 31 is tilted. Another vehicle with this structure is a garbage truck. In addition, there is a specially-equipped vehicle having a structure in which a loading platform is fixed to the vehicle portion, containers and cargo boxes are placed on the loading platform, and the containers and cargo boxes are loaded and unloaded by tilting the loading platform. The present invention can also be applied to a specially equipped vehicle having this structure.

In the embodiment described above, the vehicle section 2 has an engine and runs by itself, but it may run by being towed by another vehicle.

1 Specially equipped vehicle with weighing function 2 Truck vehicle (vehicle section)
3 Special Equipment 10 Engine 12 Power Extraction Device 15 Motor 16 Storage Battery 17 Weight Display Device 20 Subframe 21 Rocking Part 22 Tilting Means 23 Lifting Mechanisms 25, 26 Weight Measuring Device 27 Hinge 31 Packing Box 33 Tilting Cylinder 36 Bottom Side Port 37 Rod side port 38 Rod 40 Receiving member 41 Contact plate 45 Lifting cylinder 50 Rod 51 Tilt system 52 Lifting system 61 Tilt pump 62 Switching valve 81 Lifting pump 82 Switching valve

Claims (5)

a vehicle portion, a cargo bed or a cargo box attached to the vehicle portion, tilting means for inclining the cargo bed or cargo box, a lifting mechanism for lifting at least a part of the cargo bed or cargo box, and a weight measuring device. In a specially equipped vehicle with a weighing function, the weight of the cargo bed or the cargo box is measured by the weight measuring device while the cargo bed or the cargo box is lifted by the lifting mechanism,
The tilting means has a tilting cylinder and a tilting pump, and the tilting pump is used as a tilting side drive source to drive the tilting cylinder to change the attitude of the loading platform or the cargo box,
The lifting mechanism is operated by a drive source separate from the tilting pump, and lifts the loading platform or packing box,
The vehicle section runs using the engine as a power source for running,
Having a power take-off device for taking out power from the power source for running,
The lifting mechanism has a lifting cylinder and a lifting pump, and drives the lifting cylinder using the lifting pump as a driving source to lift the loading platform or the cargo box,
A specially equipped vehicle with a weighing function, wherein one of the tilting pump and the lifting pump is driven by power transmission from the power take-off device, and the other is driven by a motor. a vehicle portion, a cargo bed or a cargo box attached to the vehicle portion, tilting means for inclining the cargo bed or cargo box, a lifting mechanism for lifting at least a part of the cargo bed or cargo box, and a weight measuring device. In a specially equipped vehicle with a weighing function, the weight of the cargo bed or the cargo box is measured by the weight measuring device while the cargo bed or the cargo box is lifted by the lifting mechanism,
The tilting means has a tilting cylinder and a tilting pump, and the tilting pump is used as a tilting side drive source to drive the tilting cylinder to change the attitude of the loading platform or the cargo box,
The lifting mechanism is operated by a drive source separate from the tilting pump, and lifts the loading platform or packing box,
The vehicle section runs using the engine as a power source for running,
Having a plurality of power extraction devices for extracting power from the power source for running,
The lifting mechanism has a lifting cylinder and a lifting pump, and drives the lifting cylinder using the lifting pump as a driving source to lift the loading platform or the cargo box,
A specially equipped vehicle with a weighing function, wherein the tilting pump and the lifting pump are driven by receiving power transmission from different power take-off devices. 3. The cylinder for tilting has a bottom side port and a rod side port, and the bottom side port and the rod side port are opened to the tank or to the atmosphere during weight measurement. Specially equipped vehicle with weighing function described. a vehicle portion, a cargo bed or a cargo box attached to the vehicle portion, tilting means for inclining the cargo bed or cargo box, a lifting mechanism for lifting at least a part of the cargo bed or cargo box, and a weight measuring device. In a specially equipped vehicle with a weighing function, the weight of the cargo bed or the cargo box is measured by the weight measuring device while the cargo bed or the cargo box is lifted by the lifting mechanism,
The tilting means has a tilt-side action mechanism that acts on the bed or the packing box to tilt the bed or the packing box, and a tilt-side drive source that drives the tilt-side action mechanism,
The lifting mechanism is operated by a drive source different from the tilt-side drive source and lifts the loading platform or packing box ,
The vehicle section runs using the engine as a power source for running,
Having a power take-off device for taking out power from the power source for running,
The lifting mechanism has a lifting cylinder and a lifting pump, and drives the lifting cylinder using the lifting pump as a driving source to lift the loading platform or the cargo box,
The tilt-side drive source is a tilt pump,
A specially equipped vehicle with a weighing function, wherein one of the tilting pump and the lifting pump is driven by power transmission from the power take-off device, and the other is driven by a motor. a vehicle portion, a cargo bed or a cargo box attached to the vehicle portion, tilting means for inclining the cargo bed or cargo box, a lifting mechanism for lifting at least a part of the cargo bed or cargo box, and a weight measuring device. In a specially equipped vehicle with a weighing function, the weight of the cargo bed or the cargo box is measured by the weight measuring device while the cargo bed or the cargo box is lifted by the lifting mechanism,
The tilting means has a tilt-side action mechanism that acts on the bed or the packing box to tilt the bed or the packing box, and a tilt-side drive source that drives the tilt-side action mechanism,
The lifting mechanism is operated by a drive source different from the tilt-side drive source and lifts the loading platform or packing box,
The vehicle section runs using the engine as a power source for running,
Having a plurality of power extraction devices for extracting power from the power source for running,
The lifting mechanism has a lifting cylinder and a lifting pump, and drives the lifting cylinder using the lifting pump as a driving source to lift the loading platform or the cargo box,
The tilt-side drive source is a tilt pump,
A specially equipped vehicle with a weighing function, wherein the tilting pump and the lifting pump are driven by receiving power transmission from different power take-off devices.

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