JPH0118220Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention has a hose reel for storing a hose that supplies fluid from an external fluid source to the vehicle body in a wound state, which is connected to the rear of the vehicle body so as to be movable up and down. A liquid spraying work vehicle, in which a free wheel for supporting the ground is interlocked with the reel so as to be driven and rotated as the wheel rotates, and each of left and right front wheels and left and right rear wheels is provided on the vehicle body so that the direction can be changed freely. Regarding.

Such a liquid spraying work vehicle is capable of spraying liquid while supplying liquid from an external liquid source to the vehicle body through a hose, and is equipped with a liquid storage tank mounted on the vehicle body or in a towed state. Compared to the conventional method, this method allows the vehicle to travel better even on places with poor driving conditions such as slopes, but it has the following disadvantages.

That is, conventionally, the idle wheels for ground contact support are generally fixed in a state along the straight direction of the vehicle body, but in this case, when the vehicle body turns, the idle wheels facing in a direction different from the vehicle body turning direction are fixed. As a result of slipping, the reel cannot be driven and rotated by an appropriate amount according to the amount of progress of the vehicle.
There was a risk that a large tension force would be applied to the hose.

The present invention has been developed with the above-mentioned circumstances in mind, and its purpose is to enable the vehicle body to turn without applying a large tension force to the hose.

The liquid spraying work vehicle according to the present invention is characterized in that it is provided with an actuator for changing the orientation of the free wheel and a means for detecting the turning direction of the vehicle body, and that the free wheel is aligned with or along the turning direction of the vehicle body. The present invention is further provided with a control means for operating the actuator based on the detection result of the turning direction detection means so as to maintain the turning direction in a similar state, and its effects are as follows.

That is, when the vehicle body is turning, the direction of the idle wheels is automatically changed so as to be maintained along the vehicle body turning direction or in a state close to the same,
It is designed to suppress the slippage of the idle wheels as much as possible.

Therefore, the reel can be driven and rotated by an appropriate amount depending on the amount of travel of the vehicle body, and it is possible to suppress the application of a large tension force to the hose, thereby eliminating early damage to the hose. As a result, a liquid spraying vehicle that can be used satisfactorily for a long period of time has been obtained.

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, a pair of left and right front propulsion wheels 1 and a pair of left and right rear propulsion wheels 2 are provided so as to be able to freely change their direction, and a driving portion G is provided on the end side of the vehicle body. At the same time, on the left side of the rear end of the vehicle,
A control unit including a driver's seat 3, a steering handle 4, etc. is provided, and is located on the right side of the control unit,
A device A for mixing a chemical such as an insect repellent with water, and
Liquid pump 5 for pumping the mixture therefrom
, and further provided with a large number of nozzles 6 for ejecting the mixture pumped by the pump 5 upward and both right and left and laterally, and a rotary vane 7 for dispersing the liquid ejected from the nozzles 6. A hose feeding reel 9 that removably connects the spraying device B to the rear of the vehicle body and stores the hose 8 that supplies water from an external water source to the mixing device B in a wound state.
A hose dispensing device C is provided which is detachably connected to the spraying device B, and is equipped with a hose dispensing device C that drives and rotates the hose 8 so that it is dispensed or wound up as the vehicle advances. A liquid spraying work vehicle for spraying is configured. However, instead of spraying device B and hose feeding device C,
Various work devices such as grass cutting devices can be attached to perform various tasks, and the above-mentioned spraying device B
In addition to installing a water sprinkling nozzle device in place of the hose 8, the structure is such that it can perform various liquid spraying operations, such as supplying water from the hose 8 to the liquid pressure pump 5 to perform watering operations.

Various types of water can be used as the external water source, such as tap water, river water, and pond water.In order to pump water to the vehicle body, the hose 8 is directly connected to a water pipe and the water pressure is increased by connecting the hose 8 directly to the water pipe. As shown in the illustrative diagram, water in a tank 10 storing various types of water such as tap water may be pumped by an engine-driven pump 11; Water from a river or pond may be directly sucked and pumped by the pump 11.

To connect the spraying device B to the vehicle body, each of the pair of left and right lower arms 12 and the pair of left and right upper arms 13 are pivotally connected to the vehicle body so as to be movable up and down about the horizontal axis X. A spraying device B is connected to the arms 12 and 13, and the spraying device B and the hose feeding device C are connected to each other so that they can be freely raised and lowered relative to the vehicle body. However, 14 in the figure is a single-acting hydraulic cylinder for lifting and lowering the working device that acts on the lower arm 12, and in normal working conditions,
The operation will be maintained in the descending operation state.

As shown in FIG. 3, the hose feeding device C is configured with a main frame 15 having a U-shape when viewed from the front and back, and a pair of left and right ground support idlers 16, 16.
is pivotally supported on the main frame 15, and the hose winding and storage reel 9 is rotatably supported on the main frame 15. The rotating body 21 is connected to the hose conveying rotating body 21 and the hose guide 22 by a transmission belt 20 so as to rotate integrally with each other, and is disposed facing each other so as to sandwich the feed-out side portion of the hose 9. is slidably externally fitted onto a spline shaft 23 freely rotatably supported on the main frame 15, and the guide 22 is slidably externally fitted onto a spiral grooved shaft 24 non-rotatably supported on the main frame 15. The guide tool 22 is provided with a piece 25 that engages with the spiral groove V, and the spiral groove V is formed in an endless shape so that the guide tool 22 can slide back and forth as the spiral grooved shaft 24 rotates. Furthermore, the reel support shaft 19 and the spline shaft 23 are interlocked and connected by the transmission belt 26 so as to rotate together, and the rotating body 21 and the guide tool 22 are integrally moved in the direction of the reel rotation axis. and are engaged and connected in a gear interlocking state so as to rotate integrally in a reverse rotation state,
The structure is such that the hose 8 can be paid out as the vehicle moves forward, and the hose 9 can be recovered as the vehicle moves backward.

However, as described above, the idler wheel 16 is interlocked and connected to the reel 9 and the rotating body 21 so as to be driven by its rotational force, and also supports the spraying device B and the hose feeding device C on the ground. It is.
In addition, a flow path r is formed in the reel support shaft 19, and a joint 28 for attaching an extension hose 27 connected to the mixing device A or the liquid pressure pump 5 is provided.
is attached to the end of the reel support shaft 19.

As shown in FIG. 4, the left and right front wheels 1 and the left and right rear wheels 2 are pivotally connected to both ends of the front wheel drive case 1A and to both ends of the rear wheel drive case 2A so as to be able to change their direction. A cylinder tube moving type hydraulic cylinder 29 for changing the direction of the vehicle and a moving cylinder tube type hydraulic cylinder 30 for changing the direction of the left and right rear wheels 2 are provided. A sensor 31 is provided to detect the rotational position of the steering handle 4, and a first steering state in which only the front wheels 1 are changed in direction as shown in FIG.
A second steering state in which the wheels 1 and 2 are changed by the same amount in opposite directions, and a third state in which the front and rear wheels 1 and 2 are changed in the same direction by the same amount as shown in FIG.
A steering condition setting device 32 for selecting a steering condition is provided so as to be manually operable, and sensors 33 and 34 are provided for detecting the orientation positions of the front and rear wheels 1 and 2, respectively. Based on the information from the steering wheel rotation position detection sensor 31, the wheel orientation position detection sensors 33, 34, and the steering state setter 32, the electromagnetic control valves 29A, A control unit is provided to automatically operate 30A.

That is, in configuring the control section, each of the first discriminating circuit F ₁ for the first steering state, the second discriminating circuit F ₂ for the second steering state, and the third discriminating circuit F ₃ for the third steering state is configured. , are provided to be selectively activated based on the information signal of the steering state setting device 32, and each discriminator circuit F ₁ ,
Each of F ₂ and F ₃ is configured to output an operation command signal to the control valves 29A and 30A in order to maintain a set relationship between the steering wheel rotation position detection signal and the wheel orientation detection signal, and When the handle 4 is rotated, the front and rear wheels are moved so that the vehicle body is moved in a direction corresponding to the direction of rotation, and the direction of the front wheels 1 or rear wheels 2 is changed by an amount corresponding to the amount of rotation. 1 and 2 are configured so that the direction can be changed.

In order to connect the hose dispensing device C to the dispersing device B, a connecting arm 35 whose both ends are pivoted about a vertical axis to the hose dispensing device C and the dispersing device B, respectively;
Double-acting hydraulic cylinders 36, each of which has both ends pivotally connected to the hose feeding device C and the spraying device B around a vertical axis, are arranged in parallel in the vehicle width direction, so that the hose feeding device C is connected to the vehicle body width direction. The hose feeding device C is configured to be able to move in parallel in this direction, and to change the direction of the hose feeding device C by operating a double-acting hydraulic cylinder 36.

As shown in FIG. 5, based on information from the wheel direction position detection sensors 33, 34 and the steering state setting device 32, the idle wheels 16, 16 are aligned with or along the vehicle turning direction. Cylinder 3 suitable for maintaining a close state
6, and operates the electromagnetic control valve 36A of the cylinder 36 to maintain it at the target position based on the determination result and the detection signal of the telescopic sensor 37 that detects the extended/contracted position of the cylinder 36. The first, second, and third control circuits S ₁ , S ₂ , and S ₃ are provided so that when the vehicle body turns, the idle wheels 16 are aligned with the vehicle body turning direction.
It is designed to suppress slippage.

To explain the first, second, and third control circuits S ₁ , S ₂ , and S ₃ , in the first steering state, the first
Alternatively, based on the information of the steering state setting device 32, the control circuit S ₁ is operated in the second steering state, the second control circuit S ₂ is operated in the second steering state, and the third control circuit S ₃ is operated in the third steering state. It is configured to be activated.

Next, another embodiment will be described.

In the embodiment, the chemical agent is sprayed while water from the water source outside the machine is supplied to the vehicle body through the hose 8.
Alternatively, the medicine may be sprayed while being supplied to the vehicle body.

In order to change the direction of the front and rear wheels 1 and 2, the steering handle 4 and the front and rear wheels 1 and 2 may be connected by various known link mechanisms.
In addition to being able to switch to three types of steering states as in the embodiment, for example, the third
The steering may be performed only in the steering state.

In the embodiment, the direction of the free wheel 16 is changed by changing the direction of the entire hose feeding device C, but for example, the direction of the free wheel 16 may be changed with respect to the main frame 15. .

In addition to the hydraulic cylinder 36, various types of actuators such as an electric motor with a reduction gear can be used as the actuator for the direction change operation.

The means for detecting the turning direction of the vehicle is the front and rear wheels 1 and 2.
In addition to detecting the direction of the steering wheel 4,
Various configuration changes can be made, such as detecting the rotational position of
In order to configure the control means, a microcomputer may be used to carry out arithmetic processing.

[Brief explanation of drawings]

The drawings show an embodiment of the liquid spraying vehicle according to the present invention, in which Fig. 1 is an overall side view, Fig. 2 is an overall plan view, and Fig. 3 is an expanded cutaway plan view of a hose feeding device.
FIG. 4 is a schematic view showing the steering operation configuration, FIG. 5 is a schematic view showing the cylinder operation configuration, and FIGS. 6A, 6B, and 6A are schematic plan views showing the turning state. 1...Front wheel, 2...Rear wheel, 8...Hose, 9...
...Reel, 16... Idle wheel for ground support, 36...
Actuator for direction change operation.

Claims (1)

[Scope of utility model registration request] Hose 8 that supplies liquid from the external liquid source to the vehicle body side
A hose reel 9 that stores the hose in a wound state,
It is connected to the rear part of the vehicle body so as to be able to rise and fall freely, and is interlocked and connected to the reel 9 so as to drive and rotate an idle wheel 16 for supporting the ground contact with the reel 9 as the reel 9 rotates. each,
The vehicle is a liquid spraying work vehicle equipped with a vehicle body so as to be able to freely change the direction thereof, and is provided with an actuator 36 for changing the direction of the idle wheel 16 and a means for detecting the turning direction of the vehicle body. 1
6 is provided with a control means for operating the actuator 36 based on the detection result of the turning direction detecting means so as to maintain the actuator 36 along the turning direction of the vehicle body or in a state close to the turning direction of the vehicle body.