JP7441394B2 - Chemical spraying vehicle - Google Patents

Description

The present invention relates to a chemical spraying vehicle that sprays chemical liquid.

Conventionally, a chemical solution stored in a chemical solution tank attached to the rear of a traveling vehicle body (hereinafter also simply referred to as "vehicle body") is sprayed over the field from a spraying boom attached to the front of the traveling vehicle body. A moving chemical spraying vehicle is known.

For example, Patent Document 1 discloses a chemical liquid spraying vehicle in which a stair-like work step is disposed at a position rearward of a chemical liquid tank and faces outward in the vehicle width direction (vehicle body side).

This work step described in Patent Document 1 is configured to be able to rotate up and down around a rotation axis extending in the front and back direction so that the chemical solution spraying vehicle does not come into contact with the crops while traveling on the field. has been done. Therefore, after rotating the work step downward, the operator must climb up the work step from the rear side of the chemical solution spraying vehicle and replenish the chemicals and water inside from the input port provided at the top of the chemical solution tank. Can be done.

JP2018-102180

However, the work steps described in Patent Document 1 are arranged outward in the width direction of the vehicle body so that the chemical solution tank can be approached from the rear side of the chemical solution spraying vehicle. The work step was bulky outward in the width direction, and the work step sometimes came into contact with the surroundings while traveling (see Fig. 6).

Therefore, an object of the present invention is to provide a chemical liquid spraying vehicle that can prevent a working step provided behind a chemical liquid tank from coming into contact with the surroundings while the vehicle is traveling. .

Such an object of the present invention is to
a traveling vehicle body having a traveling device for traveling in a field;
a chemical liquid tank provided at the rear of the traveling vehicle body and storing a chemical liquid;
a spraying boom that sprays the chemical solution stored in the chemical solution tank onto the field;
A chemical liquid spraying vehicle comprising a work step disposed toward the outside in the width direction of the vehicle body behind the chemical liquid tank,
The work step is carried out by a chemical solution spraying vehicle, characterized in that the length in the vertical direction can be changed, and when the length in the vertical direction is shortened, it fits within the width of the chemical solution tank in the width direction of the vehicle body. achieved.

According to the present invention, when the length in the vertical direction of the work step arranged behind the chemical liquid tank is changed to be shorter, the structure is configured such that it fits within the width of the chemical liquid tank in the vehicle body width direction. It is possible to prevent the work step from coming into contact with the surroundings while the chemical solution spraying vehicle is running.

In a preferred embodiment of the invention,
When the length of the working step in the vertical direction is the longest, the outer end of the lower end of the working step in the vehicle width direction is the same as the outer end of the traveling device in the vehicle width direction. or located inside the outer end of the traveling device in the vehicle body width direction.

According to this preferred embodiment of the present invention, even when the length of the work step in the vertical direction is the longest, the outer end of the lower end of the work step in the vehicle width direction It is configured to be located at the same position as the outer edge of the vehicle body's running gear, or inside it, so if the worker forgets to shorten the length in the vertical direction after using the work step. In addition, it is possible to prevent the work step from coming into contact with crops on the field located outside the traveling device in the vehicle width direction.

In a further preferred embodiment of the invention,
A pump case is provided at the rear of the chemical tank and houses a chemical pump that supplies the chemical liquid stored in the chemical tank to the spraying boom,
The working step includes a fixed part fixed to an outer surface of the pump case in the vehicle width direction, and a rotating part rotatably connected to the fixed part, and the rotating part is rotated upward. Then, the length of the working step in the vertical direction becomes shorter, and the working step falls within the width of the chemical tank in the vehicle body width direction.

According to this preferred embodiment of the present invention, since the working step is fixed to the pump case housing the chemical liquid pump, the working step to which a load is applied can be reliably supported by the pump case. It is possible to prevent the work step from falling off, and since there is no need to separately provide a stay or the like for fixing the work step to the traveling vehicle body, the number of parts can be reduced.

Furthermore, according to this preferred embodiment of the present invention, since the lower part of the working step fixed to the pump case is configured to be rotatable, the lower part of the working step is rotatable. The amount of protrusion outward in the width direction of the vehicle body when it is moved can be reduced, making it less bulky.

In a further preferred embodiment of the invention,
The traveling vehicle body has a bonnet that covers the engine at the front part thereof,
The traveling device is composed of front wheels and rear wheels,
A scraper plate for removing mud adhering to the front wheels is attached to a boarding step used when boarding the driver's seat of the traveling vehicle body, and the scraper plate extends forward to a position close to the upper part of the front wheels. ing.

According to this preferred embodiment of the present invention, the scraper plate allows the vehicle to drive while removing mud that has adhered to the front wheels. Therefore, excessive mud that has adhered to the front wheels may cause the vehicle to become unstable or become unable to drive. It is possible to prevent this from happening.

Furthermore, according to this preferred embodiment of the present invention, the scraper plate extends to a position close to the top of the front wheel, so that maintenance of the area around the hood can be carried out by riding on the scraper plate without the need for separate scaffolding. It is very convenient.

In a further preferred embodiment of the invention,
The scraper plate extends to a position outside the front wheels in the width direction of the vehicle body, and the upper surface of the scraper plate is covered with a guard plate that prevents mud from coming off from below.

According to this preferred embodiment of the present invention, since the scraper plate extends to a position outside the front wheels in the width direction of the vehicle body, the worker can stably ride on the scraper plate, and the scraper plate can be removed from the front wheels. can be moved outward in the width direction of the vehicle body, and therefore, it is possible to effectively prevent the removed mud from adhering to the rear running gear.

Further, according to this preferred embodiment of the present invention, the upper surface of the scraper plate is covered with the guard plate to prevent mud from coming off from below, so that the mud removed from the front wheel by the scraper plate is removed from the scraper plate. It is possible to prevent the work materials from being scattered on or near the upper surface of the guard plate, and to place the work materials on the guard plate with peace of mind.

In a further preferred embodiment of the invention,
At least a part of the spreading boom is configured as a side boom that can be stored along the side of the traveling vehicle body and can be rotated in the vertical direction,
When the side boom is retracted and the elevation angle of the side boom is less than the first predetermined angle, when the steering angle of the steering device that steers the traveling device becomes equal to or greater than the second predetermined angle, The side boom is configured to automatically rotate upward.

According to this preferred embodiment of the present invention, when the side boom is stored along the side of the traveling vehicle body and its elevation angle is less than the first predetermined angle, the steering angle of the steering device is set to the second predetermined angle. When the angle exceeds a predetermined angle, the side boom is automatically rotated upward, which prevents the traveling gear whose direction has been changed by the steering device from coming into contact with the side boom and damaging the side boom. be able to.

According to the present invention, it is possible to provide a chemical solution spraying vehicle that can prevent a working step provided behind the chemical solution tank from coming into contact with the surroundings while the vehicle is traveling.

FIG. 1 is a schematic left side view of a chemical solution spraying vehicle according to a preferred embodiment of the present invention. FIG. 2 is a plan view of essential parts of the chemical spraying vehicle shown in FIG. 1. FIG. 3 is a block diagram of the control system, detection system, input system, and drive system of the chemical spraying vehicle shown in FIG. FIG. 4 is a partially enlarged plan view showing how the side boom of the chemical spraying vehicle shown in FIG. 1 is rotated in the vehicle width direction. FIG. 5 is a partially enlarged plan view of the front portion of the chemical solution spraying vehicle, showing a state in which the left and right pair of side booms are both rotated outward in the vehicle width direction. FIG. 6 is a front view of a main part of the chemical spraying vehicle shown in FIG. 1, showing a state in which the free end of the left side boom is rotated upward. FIG. 7 is a schematic perspective view of the vicinity of a pump case provided at the rear of the chemical solution tank according to the embodiment shown in FIG. FIG. 8 is a schematic rear view showing how the lower part of the working step is rotated up and down. FIG. 9 is a schematic perspective view of the vicinity of the boarding step and left front wheel according to the embodiment shown in FIG. 1. FIG. 10 is a flowchart showing a control procedure in which the pair of left and right side booms according to the embodiment shown in FIG. 1 are automatically rotated in the vertical direction. 11(a) is a schematic plan view of the vicinity of the HST lever shown in FIG. 1, and FIG. 11(b) is a schematic perspective view showing the internal state of the lever panel.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a schematic left side view of a chemical solution spraying vehicle 1 according to a preferred embodiment of the present invention, and FIG. 2 is a plan view of essential parts of the chemical solution spraying vehicle 1 shown in FIG. 1.

In this specification, as shown by arrows in FIGS. 1 and 2, the side in the traveling direction of the chemical spraying vehicle 1 is referred to as the "front", and unless otherwise specified, the side in the traveling direction of the chemical spraying vehicle 1 is referred to as the "front". The left side is called the "left" and the opposite side is called the "right" (see Figure 2).

As shown in FIG. 1 or 2, the chemical solution spraying vehicle 1 includes a traveling vehicle body 2 (see FIG. 1), a chemical solution tank 30 attached to the rear of the traveling vehicle body 2, and a chemical solution tank 30 provided at the front of the traveling vehicle body 2. a center boom 50, a pair of left and right side booms 51, 52 provided on the left and right sides of the center boom 50, and a chemical solution pump ( (not shown). The center boom 50 and the side booms 51 and 52 are spraying booms for spraying the chemical solution stored in the chemical solution tank 30 onto the field.

The chemical liquid pump is provided inside a pump case 64 (see FIG. 1) provided at the rear of the chemical liquid tank 30.

As shown in FIG. 1, the traveling vehicle body 2 includes a main frame 8 constituting its skeleton, front wheels 6 and rear wheels 7 corresponding to the "traveling device" according to the present invention, and an engine 3 provided therein. It includes a bonnet 12 and a cabin 20 that is attached to the upper part of the main frame 8 and in which a worker (operator) rides.

The power output from the engine 3 is transmitted to the front wheels 6 and the rear wheels 7 after being changed in speed within a hydrostatic continuously variable transmission (HST). As a result, the traveling vehicle body 2 moves forward or backward.

Inside the cabin 20, there are a steering handle 5 (corresponding to the "steering device" of the present invention, see FIG. 1) that steers the front wheels 6 or rear wheels 7, and an HST lever 10 that controls the forward and backward movement of the vehicle body 2 and its speed. A driver's seat 4 (see FIG. 1), a controller 60 (see FIG. 2) for controlling the chemical solution spraying vehicle 1, and an operation section 9 (see FIG. 2) having various operation switches are provided.

The steering handle 5 is configured to be switchable between a state in which the front wheels 6 are steered and a state in which the rear wheels 7 are steered, and in particular, a state in which the rear wheels 7 are steered when the vehicle body 2 moves backward. can be switched to

The drug solution tank 30 functions as a container for storing a liquid in which a drug is dissolved, and has a shape that surrounds the driver's seat 4.

As shown in FIGS. 1 and 2, the center boom 50 and the pair of left and right side booms 51, 52 are each equipped with a large number of nozzles 42 for spraying chemicals supplied from the chemical tank 30, It is connected to the front part of the traveling vehicle body 2 via.

The pair of left and right side booms 51 and 52 extend in the width direction of the vehicle body when performing chemical spraying work (see FIG. 5), but when not working, they are rotated, and as shown in FIG. It is stored along the side of 2.

The elevating link device 13 includes an upper link arm 14 and a lower link arm 15 (see FIG. 1) that are arranged parallel to each other, a hitch bracket 16 (see FIG. 2) attached to the front of these arms, and a pair of left and right lifts. It includes a cylinder 17 (see FIG. 2), and the rear end portions of the upper link arm 14 and the lower link arm 15 are connected to a column 40 (see FIG. 1) provided at the front of the traveling vehicle body 2.

A support frame 41 (see FIG. 2) to which a center boom 50 is fixed is attached to the front part of the hitch bracket 16, and a pair of left and right lift cylinders 17 shown in FIG. When the front part of the arm 15 is rotated up and down, the hitch bracket 16, the support frame 41, the center boom 50, and the pair of left and right side booms 51 and 52 are vertically raised and lowered (rotated) as one unit.

FIG. 3 is a block diagram of the control system, detection system, input system, and drive system of the chemical spraying vehicle 1 shown in FIG. 1.

As shown in FIG. 3, the control system of the seedling transplanter 1 includes a controller 60 that controls the entire operation of the chemical spraying vehicle 1.

The controller 60 includes a processing section 89 having a CPU (Central Processing Unit), and a storage section 62 having a ROM (Read Only Memory) and a RAM (Random Access Memory). Various programs and data are stored there.

As shown in FIG. 3, the detection system of the chemical spraying vehicle 1 includes an encoder 58 that detects the steering angle of the steering wheel 56, and is provided near the rotation fulcrum 19 (see FIG. 4). The left and right side booms 51 are changed by an opening/closing angle sensor 53 that detects the rotation angle of each side boom 51, 52 about the center (see FIG. 4), and left and right vertical movement cylinders 44, 45 (see FIG. 2). , 52 (see FIG. 1).

As shown in FIG. 3, the chemical solution spraying vehicle 1 includes an operating section 9 (see FIG. 2) that functions as an input system.

The operating unit 9 has an up/down switch 90 that extends and contracts the lift cylinder 17 (see FIG. 1) and an opening/closing cylinder 18 (see FIGS. 2 and 4) to extend and retract the pair of left and right side booms 51 and 52 into the unfolded position. The left opening/closing switch 91 and the right opening/closing switch 92 for switching between the storage position and the storage position and the vertical movement cylinders 44, 45 (see FIG. 2) are extended and contracted, and the free ends of the left and right side booms 51, 52 ( A left lift switch 93 and a right lift switch 94 are provided for vertically rotating the rear end (in FIG. 2).

As shown in FIG. 3, the drive system of the chemical spraying vehicle 1 includes a motor 96 that expands and contracts each lift cylinder 17 shown in FIG. 1, and a pair of left and right side booms 51, 52 shown in FIG. Left and right geared motors 27 (see FIGS. 2 and 4) extend and retract the left and right opening/closing cylinders 18 (see FIG. 2) that switch between the unfolded position and the stored position, and the left and right vertically moving cylinders 44 and 45 (see FIG. 2). (see) are provided with left and right solenoid valves 46 for expanding and contracting.

FIG. 4 is a partially enlarged plan view showing how the side booms 51 and 52 of the chemical spraying vehicle 1 shown in FIG. 1 are rotated in the vehicle width direction, and FIG. 52 is a partially enlarged plan view of the front portion of the chemical solution spraying vehicle 1 showing a state in which all of the parts 52 are rotated outward in the vehicle width direction. FIG.

The pair of left and right side booms 51 and 52 are configured as follows, respectively, in a stowed position extending rearward along the side surface of the vehicle body 2 (see FIG. 2), and in a deployed position extending outward from the vehicle body 2 in the width direction of the vehicle body (see FIG. 2). (see Fig. 5), the left and right sides can be independently rotated and switched.

As shown in FIG. 4, opening/closing cylinders 18 having geared motors 27 are attached to the left and right upper surfaces of the support frame 41, respectively.

The tip of each opening/closing cylinder 18 is connected to mounting arms 23 or 24 provided at both left and right ends of the support frame 41, and when each opening/closing cylinder 18 expands or contracts, the mounting arms 23, 24 extend substantially in the vertical direction. It is configured to be rotated around a rotation axis 19.

Here, the rear part of the left mounting arm 23 is fixed to the left column 43 to which one end of the left side boom 51 is attached, and the rear part of the right mounting arm 24 is fixed to the right side boom 52. is fixed to the right support column 43, which has one end attached to it. Therefore, when each opening/closing cylinder 18 extends in a direction parallel to the direction indicated by arrow X in FIG. is rotated outward in the left-right direction integrally with the support column 43 about the rotation shaft 19.

As a result, as shown in FIG. 5, each of the side booms 51, 52 assumes a deployed posture in which they are deployed outward in the left and right direction, so that while traveling on the field, the center boom 50 and the pair of left and right side booms 51, 52 can be used to spread the chemical widely across the width of the vehicle.

On the other hand, when the left and right opening/closing cylinders 18 are contracted, the mounting arms 23 and 24 are rotated, and the side booms 51 and 52 are rotated inward in the left and right direction around the rotation shaft 19. be moved.

As a result, as shown in FIG. 2, each of the side booms 51, 52 assumes a stowed position extending rearward along the side surface of the vehicle body 2. can be prevented from becoming bulky outward in the vehicle width direction.

Furthermore, in both the storage position and the unfolded position, the free end of each side boom 51, 52 (the end opposite to the end attached to the mounting arms 23, 24) The end (the rear end in the storage position shown in FIG. 2) can be independently rotated up and down.

FIG. 6 is a front view of main parts showing a state in which the free end of the left side boom 51 of the chemical spraying vehicle 1 shown in FIG. 1 is rotated upward. Note that in FIG. 6, the cabin 20 and the like are omitted.

As shown in FIGS. 1 and 6, a pair of left and right vertically moving cylinders 44, 45 are provided to connect the upper portions of the left and right columns 43 and the side booms 51, 52. When the vertical cylinders 44 and 45 expand and contract, the free ends of the side booms 51 and 52 (the rear ends in the storage position shown in FIG. 2) are rotated downward or upward.

FIG. 7 is a schematic perspective view of the vicinity of the pump case 64 provided at the rear of the chemical tank 30 according to the embodiment shown in FIG. FIG.

In this embodiment, the pump case 64 is attached to the rear end of the traveling vehicle body 2, and a carrier 65 is provided on the upper surface of the pump case 64 to temporarily place chemicals, tools, and the like.

As shown in FIG. 7, a stair-shaped working step 67 is fixed to the left side of the pump case 64, and the worker climbs up the working step 67 to reach the upper surface of the chemical tank 30. The provided lid 31 can be opened to replenish the inside of the chemical solution tank 30 with medicine and water. Further, as shown in FIG. 1, a boarding step 81 used when boarding the cabin 20 is provided on the left side of the vehicle body 2 and below the cabin 20. , since the user gets on and off from the left side of the traveling vehicle body 2, the work step 67 is configured to be easily accessible.

The work step 67 includes a fixed part 68 fixed to the pump case 64 and a rotating part 69 rotatably connected to the fixed part 68.

The fixing part 68 includes a first step 70 on which the worker puts his or her feet, and a support part 72 that supports the first step 70. Two lock holes (not shown) are formed in the support part 72. has been done. The height of the lower end of the support portion 72 is configured to be approximately the same as the minimum ground height according to safety standards.

On the other hand, the rotating part 69 includes a second step 71 on which the worker puts his foot, a support section 73 that supports the second step 71, and a spring attached to the support section 73 so as to be slidable in the front and rear direction. A pin 74 is provided.

The first treadle 70 and the second treadle 71 are each formed by connecting two steel strips 78 with a gap between them. Since the mud falls onto the field, mud does not accumulate on the upper surfaces of the first tread 70 and the second tread 71. As shown in FIG. 7, the upper end of each steel strip 78 has a wavy shape to prevent an operator from slipping on each step 70, 71. In addition, the space between the first step 70 and the second step 71 is open (open) in the left-right direction (vehicle width direction), so that the worker's toes cannot touch the work step 67. do not have.

In this embodiment, the height of the lower end of the second step 71 is set at a height of 550 mm from the ground. The lid 31 of the chemical solution tank 30 can be opened while standing.

The spring pin 74 is configured to be slid forward and inserted into one of two lock holes formed in the fixed part 68 to restrict rotation of the rotating part 69. When the spring pin 74 is slid backward and pulled out from the lock hole, the rotating part 69 is rotated by the operator around the rotation fulcrum 75, and the operating position shown by the solid line in FIG. It can be switched between the storage position shown by the broken line. When the rotating part 69 is switched to the storage position, the support part 73 of the rotating part 69 extends substantially upward (substantially vertically), so that when the rotating part 69 is in the use position, as shown in FIG. The length of the entire working step 67 in the vertical direction is shorter than that of the working step 67.

When the rotating part 69 in the storage position is used, the spring pin 74 is first slid backward and pulled out from one lock hole by the operator, and the rotation restriction of the rotating part 69 is released. Ru.

Next, the rotating part 69 is rotated downward by the operator, and the rotating part 69 is switched to the usage position shown by the solid line in FIG. 8 .

As shown in FIG. 7, a push plate 76 is attached to the front surface of the fixed part 68, and when the rotating part 69 is rotated downward, the back surface of the push plate 76 (inner side in the vehicle width direction) The upper part of the support part 73 of the rotating part 69 comes into contact with the surface of the rotating part 69, and the rotating part 69 is held in the usage position.

At this time, since the other lock hole is designed to be aligned with the spring pin 74 in the front-rear direction, the spring pin 74 is slid forward and inserted into the other lock hole due to the biasing force of the spring, and rotates. Rotation of the portion 69 is restricted when the portion 69 is in the usage position. A rubber plate is attached to the surface of the push plate 76 to prevent rattling of the work step 67 and to absorb shock when the rotating portion 69 is rotated with strong force.

As shown in FIG. 8, the outer end in the vehicle width direction of the lower end of the working step 67 in which the rotating part 69 is switched to the operating position as described above is located outside the left rear wheel 7 in the vehicle width direction. If the operator forgets to change the rotating part 69 of the work step 67 to the stowed position, the work step 67 will be located on the outside of the left rear wheel 7 in the vehicle body width direction (the left It is possible to prevent crops from coming into contact with crops on the field located in the opposite direction.

On the other hand, when the rotating part 69 is stored in the operating position, the spring pin 74 is first slid backward and pulled out from the other lock hole by the operator, and the rotating part 69 is rotated. Restrictions will be lifted.

Next, the rotating portion 69 is rotated upward by the operator, and the rotating portion 69 is switched to the storage position shown by the broken line in FIG. 8 .

Here, when the rotating part 69 is rotated upward, the support part 73 of the rotating part 69 comes into contact with the outer (left side) surface in the vehicle width direction of the push plate 76 (see FIG. 7), and the rotating part 69 is rotated upward. 69 is held in the stored position (see broken line in FIG. 8).

At this time, since one lock hole formed in the support part 72 of the fixing part 68 is designed to be aligned with the spring pin 74 in the front-rear direction, the spring pin 74 is slid forward by the biasing force of the spring. is inserted into one of the lock holes, and its rotation is restricted while the rotating portion 69 is in the storage position. In this embodiment, the push plate 76 is in contact with the frame of the traveling vehicle body 2, and it is possible to prevent the push plate 76 from being damaged when a strong load is applied to the work step 67.

As shown in FIG. 8, in the work step 67 in which the rotating part 69 is switched to the storage position as described above, the chemical liquid is spread because it falls within the width of the chemical liquid tank 30 in the vehicle width direction (left and right direction). It is possible to prevent the work step 67 from coming into contact with the surroundings while the vehicle 1 is running. Further, the work step 67 does not get in the way when the operator moves around the side of the chemical spraying vehicle 1.

In addition, since the height of the lower end of the support part 72 of the fixed part 68 is configured to be approximately the same as the minimum ground height according to safety standards, when the rotating part 69 is switched to the stowed position, the In addition, the lower part of the fixing part 68 is prevented from coming into contact with the crops on the field.

A pair of left and right hooks 77 for pulling out the chemical tank 30 are provided on the rear surface of the chemical tank 30, and also serve as grips (handrails) for the worker to get on and off the work step 67.

On the other hand, FIG. 9 is a schematic perspective view of the vicinity of the boarding step 81 and the left front wheel 6 according to the embodiment shown in FIG.

As shown in FIGS. 1 and 9, the boarding step 81 provided on the left side of the vehicle body 2 and below the cabin 20 includes a third step 82 and a fourth step 83. ing.

A scraper plate 84 is attached to the front part of the third step 82 and extends forward to a position close to the upper part of the left front wheel 6 (a position behind the upper part of the front wheel 6). Since the engine 3 or the vicinity of the bonnet 12 can be maintained while riding on the guard plate 84 (more precisely, on the guard plate 85 which will be explained later), the trouble of separately preparing a stepladder etc. can be saved. Can be done. In addition, while the chemical solution spraying vehicle 1 is running, mud adhering to the outer circumference of the left front wheel 6 can be removed (scraped off) by the scraper plate 84.

Here, the scraper plate 84 extends to a position outside the left front wheel 6 in the vehicle width direction (horizontal direction), and allows the operator to stably ride on the scraper plate 84, as shown in FIG. As shown by the dashed line with an arrow, the mud removed from the left front wheel 6 by the scraper plate 84 is moved outward in the vehicle width direction below the scraper plate 84.

With this configuration, it is possible to effectively prevent the mud removed from the left front wheel 6 from falling onto the field and being stepped on and adhering to the left rear wheel 7, thereby preventing the mud from sticking to the left rear wheel 7. It is possible to prevent a situation in which the posture of No. 2 is tilted due to mud.

In this embodiment, the scraper plate 84 is configured in a mesh shape for the purpose of weight reduction, but since the upper surface of the scraper plate 84 is covered by the guard plate 85, It is possible to prevent mud from slipping upward from the third step 82, and work materials such as a fuel tank can be stably placed on the guard plate 85 near the fuel filler opening, which increases convenience. expensive.

On the other hand, FIG. 10 is a flowchart showing a control procedure in which the pair of left and right side booms 51 and 52 according to the embodiment shown in FIG. 1 are automatically rotated in the vertical direction.

When the left and right side booms 51, 52 are not in use, they are normally placed in the storage position and then stored in the boom receiver 80 shown in FIGS. 1, 2, and 8 from above. However, if each of the side booms 51, 52 is lowered excessively, when the steering handle 5 is largely steered such as when turning, the front wheel 6 or rear wheel 7 may come into contact with each other, and the nozzle 42 may be damaged.

In light of such a situation, in this embodiment, when the steering handle 5 is steered by a predetermined angle or more, the controller 60 automatically raises the side boom 51 or 52 in the following manner. It is composed of

The controller 60 first determines whether or not each side boom 51, 52 is in the retracted position based on the detection signal of the opening/closing angle sensor 53 (step S1).

If the result of the determination is that each side boom 51, 52 is not in the retracted position, the determination of the orientation based on the opening/closing angle sensor 53 is repeated until each side boom 51, 52 is switched to the retracted position.

On the other hand, if the determination result is that the side booms 51 and 52 are in the retracted position (retracted along the side of the vehicle body), the controller 60, based on the detection signal of the elevation angle sensor 54, It is determined whether the elevation angle of each side boom 51, 52 is less than a first predetermined angle (whether it is horizontal or an angle close to horizontal) (step S2).

As a result of the determination, if the elevation angle of each side boom 51, 52 is equal to or greater than the first predetermined angle, the controller 60 returns to the step of determining whether or not each side boom 51, 52 is in the retracted position ( Step S1).

On the other hand, if the determination result is that the elevation angle of each side boom 51, 52 is less than the first predetermined angle, the controller 60 controls the steering angle of the steering handle 5 to be the first angle based on the detection signal of the encoder 58. It is determined whether the angle is greater than or equal to the second predetermined angle (step S3).

As a result of the determination, if the steering angle of the steering handle 5 is less than the second predetermined angle (if the steering angle is less than the second predetermined angle when the state of being steered in the straight-ahead direction is set to 0 degrees), , the controller 60 returns to the stage of determining whether or not each side boom 51, 52 is in the retracted position (step S1).

On the other hand, if the result of the determination is that the steering angle of the steering handle 5 is equal to or greater than the second predetermined angle, the controller 60 raises the side boom 51 or 52 on the side where the steering handle 5 is turned to the highest position. It is rotated upward to the position (the maximum rotated position) (step S4).

For example, when the steering handle 5 is turned to the left (largely), the controller 60 contracts the left vertical movement cylinder 44 and rotates the left side boom 51 upward to the highest position.

After rotating one of the side booms 51 or 52 upward in this manner, the controller 60 determines whether the steering angle of the steering handle 5 has been returned to the straight forward direction based on the detection signal of the encoder 58. (Step S5).

As a result of the determination, if the steering angle of the steering handle 5 has been returned to the straight forward direction, the controller 60 moves the one side boom 51 or 52 that was rotated upward in step S5 to the position before rotating. It is rotated downward until it reaches the state (elevation angle) (step S6). Thus, in this embodiment, the controller 60 is configured to return the side boom 51 or 52 to its original height when the steering angle of the steering handle 5 is returned to the straight direction.

On the other hand, if the result of the determination is that the steering angle of the steering wheel 5 has not been returned to the straight-ahead direction, the determination based on the detection signal of the encoder 58 is repeated until the steering angle is returned to the straight-ahead direction.

With the above control configuration, when the front wheels 6 or rear wheels 7 are steered by operating the steering handle 5, the nozzles 42 of the side booms 51, 52 are automatically brought to a height where they do not come into contact with the front wheels 6 or rear wheels 7. Since the nozzle 42 is rotated upward, damage to the nozzle 42 is prevented.

In addition, when the steering position of the steering handle 5 returns to the straight-ahead position, the side booms 51 and 52 automatically rotate downward to the position before being raised, so the operator does not have to perform a return operation, making the operation complicated. It is prevented from becoming.

Furthermore, by raising only the side boom 51 or 52 on the side where the steering handle 5 is operated, the amount of oil sent can be suppressed, thereby preventing malfunctions due to insufficient hydraulic pressure in other hydraulically operated parts. Ru.

11(a) is a schematic plan view of the vicinity of the HST lever 10 shown in FIG. 1, and FIG. 11(b) is a schematic perspective view showing the internal state of the lever panel 11.

The HST lever 10 is operated along an opening 21 formed in the lever panel 11 shown in FIG. 11(a).

The opening 21 is composed of a forward movement area 28, a reverse movement area 29, a neutral area 22, and a lock area 26 extending to the right from the front end of the forward movement area 28. When the HST lever 10 is operated to the forward movement area 28, the traveling vehicle body 2 is moved. When the vehicle moves forward and is operated to the reverse region 29, the vehicle body 2 moves backward, and when the vehicle body 2 is operated to the neutral region 22, the vehicle body 2 stops. Further, within the same forward movement region 28, the further forward the HST lever 10 is operated, the higher the forward speed of the traveling vehicle body 2 becomes.

Here, when the traveling vehicle body 2 suddenly stops or suddenly starts, the HST lever 10 is biased in the neutral direction (direction to be moved to the neutral region 22) by the pressure inside the hydrostatic continuously variable transmission. is known, and in this embodiment, this characteristic is utilized as a safety device that suppresses acceleration of the traveling vehicle body 2.

However, some operators (drivers) find it bothersome if the HST lever 10 is biased toward the neutral side every time the traveling vehicle body 2 suddenly stops or starts. When the HST lever 10 is operated into the lock area 26 extending to the right from (maintained at maximum vehicle speed). When the operator wants to stop or start the traveling vehicle body 2, the operator can do so using a clutch pedal and a brake pedal (not shown).

According to this embodiment, the length of the entire working step 67 in the vertical direction is changed to be shorter by rotating the rotating portion 69 of the working step 67 located rearward than the chemical liquid tank 30 upward. In this case, as shown by the broken line in FIG. 8, since the work step 67 is configured to fit within the width of the chemical liquid tank 30 in the vehicle body width direction, the work can be performed while the chemical liquid spraying vehicle 1 is traveling. Step 67 can be prevented from coming into contact with the surroundings.

Further, according to this embodiment, when the length of the work step 67 in the vertical direction is the longest, that is, when the rotating part 69 is rotated downward (the state shown by the solid line in FIGS. 7 and 8) ), the outer end of the lower end of the work step 67 in the vehicle width direction is located inside the outer end of the left rear wheel 7 in the vehicle width direction. Therefore, even if the worker forgets to shorten the length in the vertical direction after using the work step 67 (specifically, if he forgets to rotate the rotating part 69 upward), the work will continue. Step 67 can prevent the left rear wheel 7, which is an example of a traveling device, from coming into contact with crops on the field located on the outside (left side) in the vehicle width direction.

Further, according to this embodiment, since the working step 67 is fixed to the pump case 64 that houses the chemical pump, the working step 67 to which a load is applied can be reliably supported by the pump case 64. It is possible to prevent the working step 67 from falling off, and since there is no need to separately provide a stay or the like for fixing the working step 67 to the traveling vehicle body 2, the number of parts can be reduced.

In addition, according to this embodiment, since the lower part of the working step 67 fixed to the pump case 64 is configured to be rotatable, it is possible to rotate the working step 67 more easily than in the case where the entire working step 67 is rotated. The amount of outward protrusion in the vehicle width direction when the vehicle is moved can be reduced, allowing it to be used anywhere.

Further, according to the present embodiment, since it is possible to drive while removing (scraping off) mud attached to the left front wheel 6 using the scraper plate 84, it is possible to drive while removing (scraping off) mud attached to the left front wheel 6. It is possible to prevent a situation in which the posture of the vehicle body 2 becomes unstable or becomes unable to run.

Furthermore, according to the present embodiment, since the scraper plate 84 extends to a position close to the upper part of the left front wheel 6, the scraper plate 84 can be climbed onto the bonnet 12 (see FIG. 1)), and it is very convenient.

Further, according to this embodiment, since the scraper plate 84 extends in the vehicle width direction to a position further outward in the vehicle width direction than the left front wheel 6, the worker can stably ride on the scraper plate 84, and The mud removed from the left front wheel 6 can be moved outward in the width direction of the vehicle body, so that it is possible to effectively prevent the removed mud from adhering to the left rear wheel 7.

Further, according to the present embodiment, the upper surface of the scraper plate 84 is covered by the guard plate 85 to prevent mud from coming off from the bottom to the top of the scraper plate 84. It is possible to prevent the removed mud from scattering on or near the upper surface of the scraper plate 84, and work materials can be placed on the guard plate 85 with peace of mind.

In addition, according to this embodiment, the side booms 51 and 52 are stored along the sides of the traveling vehicle body 2 (in this embodiment, as shown in FIG. 2, they are stored along the traveling vehicle body 2). when the steering angle of the steering handle 5 functioning as a steering device is greater than or equal to the second predetermined angle when the angle of elevation θ (see FIG. 1) is less than the first predetermined angle. When this happens, the side booms 51 and 52 are automatically rotated upward by the vertical cylinders 44 and 45 under the control of the controller 60, so that the traveling device whose direction has been changed by steering the steering handle 5, i.e. It is possible to prevent the front wheel 6 or the rear wheel 7 from coming into contact with the side boom 51 or 52 and damaging the side boom 51 or 52, especially the nozzle 42.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the invention described in the claims, and these are also included within the scope of the present invention. Needless to say.

For example, in the embodiments shown in FIGS. 1 to 11, the outer end of the lower end of the working step 67 in the vehicle width direction is wider than the outer end of the left rear wheel 7 in the vehicle width direction. Although it is configured to fit inside in the vehicle width direction, it may be configured to be located at the same position as the outer end in the vehicle width direction of the left rear wheel 7 in the vehicle width direction. Further, the outer end in the vehicle width direction of the lower end of the work step 67 may be configured to be located to the right of the left rear wheel 7 (inner side in the vehicle width direction). Since it is possible to arrange the chemical liquid spraying vehicle further forward and to shorten the longitudinal length of the chemical liquid spraying vehicle, it is possible to improve the turning performance of the chemical liquid spraying vehicle.

Further, in the embodiment, the work step 67 includes the first step 70 and the second step 71, but even if the number of steps provided in the work step 67 is less than 2 (i.e. 1), It may be 3 or more.

Further, in the embodiment described above, the working step 67 is configured such that its length in the vertical direction (see FIG. 8) can be changed by rotating the rotating portion 69 that is the lower part thereof. The method of changing the length in the direction (expansion/contraction) is not limited to this. For example, by forming a long hole at the top of the work step and sliding the bottom part of the work step along the long hole, the length of the work step can be adjusted up or down. The length in the direction may be configured to be changeable.

In addition, in the embodiment described above, the working step 67 is attached to the left side of the pump case 64, as shown in FIG. is not necessarily required and may be attached to the right side. In this case, since it is disposed toward the right side of the traveling vehicle body 2 (in other words, so as to climb from the right side), when the rotating portion 69 is rotated downward, the vehicle body width of the working step 67 is If the outer end in the vehicle body width direction is located at the same position as the outer end in the vehicle width direction of the right rear wheel 7 or located inside than that, and the rotating part 69 is rotated upward, the chemical solution tank It is necessary to configure it so that it fits within the width of 30 mm in the width direction of the vehicle body. Further, the working step may be provided on each of the left and right sides of the pump case.

Further, in the embodiment described above, when the elevation angle of the side booms 51, 52 is less than a predetermined angle and the side booms 51 and 52 are in the stowed position, when the steering angle of the steering handle 5 becomes a predetermined angle or more, , the side boom 51 or 52 on which the steering handle 5 is turned is raised by the left and right vertical movement cylinders 44, 45, but the lift cylinder 17 shown in FIG. The booms 51 and 52 may be configured to be raised, and the free ends of both the left and right side booms 51 and 52 may be rotated upward, not only when the steering handle 5 is turned. In addition, the side boom 51 and/or 52 is configured to be raised when the amount of steering of the steering wheel 5 exceeds a predetermined value, rather than the absolute steering angle of the steering wheel 5 at that point. Good too.

Furthermore, in the embodiment described above, when the elevation angle of the side booms 51, 52 is less than a predetermined angle and the side booms 51 and 52 are in the stowed position, when the steering angle of the steering handle 5 becomes equal to or greater than the predetermined angle, The left and right vertical cylinders 44 and 45 are configured to raise the side boom 51 or 52, whichever side the steering handle 5 is turned to, to the highest position. It is not necessarily necessary to raise the steering wheel 5 to the raised position, and the steering wheel 5 may be rotated upward as necessary depending on the turning angle (rudder angle) of the steering handle 5. In this way, by changing the upward rotation amount of the side booms 51, 52 in accordance with the steering angle of the steering handle 5, even if the steering angle of the front wheels 6 or the rear wheels 7 becomes large, the side booms 51, 52 can be rotated. Contact with the nozzle 42 can be reliably prevented.

In addition, in the above embodiment, when the side booms 51 and 52 are in the retracted posture and their elevation angle is less than a predetermined angle, the controller is activated at the timing when the steering angle of the steering handle 5 becomes equal to or greater than the predetermined angle. 60 is configured to always perform control to raise the side booms 51 and 52, but a digital switch may be provided separately to switch whether or not to perform this control. In this case, the setting may be changed to a non-volatile It may also be configured to store the information in

1 Chemical solution spraying vehicle 2 Traveling body 3 Engine 4 Driver's seat 5 Steering handle 6 Front wheel 7 Rear wheel 8 Main frame 9 Operation section 10 HST lever 11 Lever panel 12 Bonnet 13 Lifting link device 14 Upper link arm 15 Lower link arm 16 Hitch bracket 17 Lift cylinder 18 Opening/closing cylinder 19 Rotating fulcrum 20 Cabin 21 Opening 22 Neutral area 23 Mounting arm 24 Mounting arm 25 Opening/closing door 26 Lock area 27 Geared motor 28 Forward area 29 Reverse area 30 Chemical tank 31 Lid 32 Work light 33 Rear glass 34 Foil cover 35 Hub 36 Opening 37 Plate 38 Nut 39 Side glass 40 Post 41 Support frame 42 Nozzle 43 Post 44 Left vertical cylinder 45 Right vertical cylinder 46 Solenoid valve 47 Solenoid valve 48 Chemical pump 50 Center boom 51 Left side boom 52 Right side boom 53 Opening/closing angle sensor 54 Elevation angle sensor 56 Pin 57 Lock hole 58 Encoder 60 Controller 61 Processing section 62 Storage section 64 Pump case 65 Carrier 67 Work step 68 Fixed section 69 Rotating section 70 First step 71 Second Step 72 Support part 73 Support 74 Spring pin 75 Rotating fulcrum 76 Push plate 77 Hook 78 Steel strip 80 Boom receiver 81 Boarding step 82 Third tread 83 Fourth tread 84 Scraper plate 85 Guard plate 90 Up/down switch 91 Left open/close switch 92 Right open/close switch 93 Left lift switch 94 Right lift switch 96 Motor

Claims (5)

a traveling vehicle body having a traveling device for traveling in a field;
a chemical liquid tank provided at the rear of the traveling vehicle body and storing a chemical liquid;
a spraying boom that sprays the chemical solution stored in the chemical solution tank onto the field;
A chemical liquid spraying vehicle comprising a work step disposed toward the outside in the width direction of the vehicle body behind the chemical liquid tank,
The work step is configured such that the length in the vertical direction can be changed, and when the length in the vertical direction is shortened, it is configured to fit within the width of the chemical solution tank in the vehicle body width direction,
A pump case is provided at the rear of the chemical tank and houses a chemical pump that supplies the chemical liquid stored in the chemical tank to the spraying boom,
The working step includes a fixed part fixed to an outer surface of the pump case in the vehicle width direction, and a rotating part rotatably connected to the fixed part, and the rotating part is rotated upward. Then, the length of the working step in the vertical direction is shortened, and the working step is configured to fit within the width of the chemical solution tank in the vehicle body width direction,
The traveling vehicle body has a bonnet that covers the engine at the front part thereof,
The traveling device is composed of front wheels and rear wheels,
A scraper plate for removing mud adhering to the front wheels is attached to a boarding step used when boarding the driver's seat of the traveling vehicle body, and the scraper plate extends forward to a position close to the upper part of the front wheels. A chemical spraying vehicle characterized by : 2. The scraper plate extends to a position outside the front wheels in the width direction of the vehicle body, and the upper surface of the scraper plate is covered with a guard plate that prevents mud from coming off from below. chemical spraying vehicle . The fixing part includes a first step on which the worker puts his foot, and a first support part that supports the first step, and the upper end of the first support part is connected to the pump case. fixed to the upper part of the side surface, and arranged so that the lower end is at approximately the same height as the lower end of the pump case,
The rotating part includes a second step on which the worker puts his foot, a second support part that supports the second step, and a second support part below the first support part. and a rotation fulcrum to which the upper part of the first support part is rotatably attached, and a worker rotates the rotation part about the rotation fulcrum to perform the work step on the first support part. and configured to be switchable between a usage position in which the second support part is linear and a storage position in which the second support part is folded above the first support part,
The first treadle and the second treadle each include a pair of steel strips each having a wavy upper surface and having a gap therebetween;
A claim characterized in that a posture holding member is provided at a lower portion of the first support portion to maintain the posture by contacting an upper portion of the second support portion in the use posture and the storage posture. The chemical solution spraying vehicle according to claim 1 or claim 2. When the length of the working step in the vertical direction is the longest, the outer end of the lower end of the working step in the vehicle width direction is the same as the outer end of the traveling device in the vehicle width direction. The liquid chemical spraying vehicle according to any one of claims 1 to 3, wherein the liquid chemical spraying vehicle is located at a position or inside an end portion of the traveling device on the outside in the vehicle body width direction. At least a part of the spreading boom is configured as a side boom that can be stored along the side of the traveling vehicle body and can be rotated in the vertical direction,
When the side boom is retracted and the elevation angle of the side boom is less than the first predetermined angle, when the steering angle of the steering device that steers the traveling device becomes equal to or greater than the second predetermined angle, The liquid chemical spraying vehicle according to any one of claims 1 to 4 , characterized in that the side boom is configured to automatically rotate upward.