JPH0441964Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a boom sprayer used for spraying chemicals in fields, and in particular, it is possible to maintain a constant height of the elongated spraying means of the boom sprayer. It concerns a certain boom sprayer.

[Prior Art] In order to appropriately spray chemicals onto crops in the field as objects to be sprayed, it is necessary to move a boom serving as a long spraying means while maintaining it at a constant height. In conventional boom sprayers, which automatically hold the boom at a constant height during spraying, a sensor is attached to the boom to measure the distance between the boom and the ground or the top of the crop, and a sensor is attached to the boom to act as a driving means to swing the boom. The height of the boom is controlled by operating the hydraulic cylinder based on the output of the sensor and changing the rocking angle of the boom (e.g., Japanese Utility Model Publication No. 1983-141763, Publication No. 58-45802) ).

[Problems to be solved by the invention] In general, a boom sprayer is equipped with a frame, a chemical tank, a pump, a boom, etc., and has a three-point link (one top link and two lower links) attached to the rear of an agricultural riding tractor. Including.JIS D67039
Since the conventional boom sprayer uses a sensor to detect the actual height of the boom at the location of the boom in relation to the traveling direction, even if the swinging hydraulic cylinder is operated, the The wheels enter the next bump in the road surface, making it difficult to control the boom to the proper height.

Further, since the lower link of the three-point link has low rigidity, when the boom is long and heavy, the tip of the boom swings greatly, and this swing does not dampen in a short time. Even if an agricultural riding tractor tilts even slightly, there is a risk that part of the boom will come into contact with the crops being sprayed, causing damage.

Further, in conventional boom sprayers, there is a large delay in controlling the height of the boom in response to irregularities in the ground, making it difficult to perform appropriate control at high travel speeds and making the device very expensive.

Therefore, in the invention of Japanese Patent Application No. 61-215956, which is an earlier application, it is possible to maintain the height of the elongated spraying means well with respect to the unevenness of the ground without any time delay, and also to A boom sprayer that suppresses rocking and can omit expensive sensors and control circuits has been disclosed. In this boom sprayer, a traveling wheel is removably pivoted on the lower side edge of a long spreading means which is extended and swingably fixed to the side of a movable frame via a drive means through an adjustment means. However, the running wheels support the elongated spreading means on the ground at locations other than the base end, thereby stabilizing the support of the elongated spreading means.

This invention relates to an improvement of the invention disclosed in Japanese Patent Application No. 61-215956, in which the running wheels, which are pivotally supported on the lower side edge of the elongated dispersing means via an adjustment means, are installed on soft ground, highly uneven ground, etc. To provide a boom sprayer that can run smoothly without any trouble even under bad conditions.

[Means for Solving the Problems] According to the boom sprayer of this invention, on the lower side edge of the elongated spraying means which is extended and swingably fixed to the side of the movable frame via the driving means, The traveling wheels are pivotally supported via adjustment means. and,
The running wheels are pivotally supported by a wheel shaft integrally formed with a separate drive means for driving the running wheels, and the driving means rotates the running wheels to constantly maintain the distance between the spraying means and the material to be sprayed. The rotating speeds of the separate drive means and the drive means of the movable frame are synchronized via a control member.

[Operation] During travel, the traveling wheels travel while maintaining a location appropriately away from the base end of the spreading means at a constant height from the ground.

A drive means for the movable frame body and a separate drive means whose rotational speeds are synchronized drive the running wheels, and the running wheels are rotated by the rotational torque transmitted from the separate drive means, and the running wheels are rotated by the rotational torque transmitted from the separate drive means. Propelled by friction.

[Example] This invention will be described below with reference to the illustrated example.

FIGS. 6 and 7 are views of an agricultural riding tractor equipped with a boom sprayer according to an embodiment, viewed from the rear and above, respectively. In FIGS. 6 and 7, an agricultural riding tractor 10 serving as a movable frame body is equipped with one running wheel 11 on each of its front, rear, left and right sides, and a boom sprayer 12 is attached to the rear via a three-point link. Ru. The boom sprayer 12 includes a chemical tank 14 that stores chemicals therein, a center boom 16 disposed at the rear lower part of the chemical tank 14, and an agricultural riding tractor 10 connected to one end of the center boom 16. It has a side boom 18 as a long spraying means that is connected to the agricultural tractor 10 so as to be openable/closable and swingable in the vertical direction, and to be extended horizontally to the side of the agricultural riding tractor 10 when spraying chemicals. ing. The side boom 18 coaxially includes a first stage part 20, a second stage part 22, and a third stage part 24 in order from its base end, and these first stage part 20, second stage part 22, and third stage part 24 are connected in a telescopic manner. Thus, the length of the side boom 18 can be extended or contracted. The swinging hydraulic cylinder 26 is disposed below the proximal end of the single-stage portion 20 and connects the base end of the single-stage portion 20 and the center boom 1 at both ends.
The side boom 18 is connected to one end of the boom 6 to a bracket 27 which is rotatably connected around a vertical axis, and swings the side boom 18 by expanding and contracting. The opening/closing hydraulic cylinder 28 is disposed on the side of the proximal end of the single-stage section 20, and is connected at both ends to the end of the center boom 16 and a bracket 27, respectively, and expands and contracts to move the side boom 18 into the agricultural field. It opens and closes with respect to the passenger tractor 10. When the agricultural riding tractor 10 travels between the spraying location and the storage location,
The side boom 18 is retracted and moved to a position extending in the longitudinal direction of the agricultural riding tractor 10 by operating the opening/closing hydraulic cylinder 28, and is stored on the side of the agricultural riding tractor 10 in a state suspended from the ground. be done. Nozzles 30 are attached to the lower surfaces of the center boom 16 and the side booms 18 at appropriate intervals. Stay 32 as adjustment means
is removably connected to the tip side end of the single-stage portion 20, extends in the vertical direction, and has a lower end pivotally supporting the running wheel 34 so as to be rotatable. Note that 36 represents the spray of the medicine ejected from each nozzle 30, and 38
1A and 2B respectively show crops that are planted on the ground 40 in a field and are used as materials to be sprayed.

8 and 9 are views showing the details of the range including the stay 32, excluding the drive mechanism of the running wheels 34, from the side and rear of the agricultural riding tractor 10, respectively. The horizontal guide groove 42 has a single step portion 20
It is formed along the longitudinal direction of the one-step portion 20 on the rear surface of the end on the tip side, and the width is narrowed on the opening side. The horizontal slider 44 is connected to the horizontal guide groove 42
The horizontal guide groove 42 allows the horizontal guide groove 42 to
a slider portion 46 that is guided in the longitudinal direction of 0; and a vertical guide groove 48 that is formed in the vertical direction on the surface opposite to the single-step portion 20 and whose width on the opening side is narrowed similarly to the horizontal guide groove 42; have. The left and right adjustment hydraulic cylinders 50 are connected at both ends to the sides of the single-stage portion 20 and the horizontal slider 44, respectively, and expand and contract to change the left and right position of the horizontal slider 44, that is, the running wheels 34. Stay 3
2 has a slider portion 52 at its upper end that fits into the vertical guide groove 48 of the horizontal slider 44 and is guided in the vertical direction. The height adjusting hydraulic cylinder 54 is connected at its upper and lower ends to the upper end of the horizontal slider 44 and the upper end of the stay 32, respectively, and changes the length of the stay 32 below the first stage portion 20 by expansion and contraction.

Figure 10 shows the swinging hydraulic cylinder 26 in Figure 13.
FIG. 3B is a hydraulic control circuit diagram for automatically controlling the height of the side boom using a conventional sensor.
The oil pump 56 sucks oil from the oil tank 58, pressurizes the oil, and discharges the oil through the oil passage 60.
Discharge to. The relief valve 62 opens when the oil pressure in the discharge oil passage 60 exceeds a predetermined value, and guides the oil in the relief valve 62 to the return oil passage 64 . The electromagnetic directional control valve 66b has a discharge oil passage 60 and a return oil passage 64.
and the control oil passages 68 and 70 communicating with each oil chamber of the swinging hydraulic cylinder 26b, and in the left position in the figure, the discharge oil passage 60 and the return oil passage 6
4 are connected to control oil passages 68 and 70, respectively, and the discharge oil passage 60 and return oil passage 64 are connected at the central position, and the discharge oil passage 60, return oil passage 64, and control oil passage 68 and 70 are connected to each other. At the right position, the discharge oil passage 60 and the return oil passage 64 are connected to the control oil passages 70 and 68, respectively. This electromagnetic directional control valve 66b is placed in the left position when swinging the side boom 18b upward.
When fixing the swing angle of b, set it to the center position,
When lowering the side boom 18b, it is placed in the right position. Side boom 18 during spraying work
b is set at the center position to fix the swing angle, and a sensor detects the actual height of the side boom 18b, and based on this detected value, the electromagnetic directional control valve 66
b is switched, the swinging hydraulic cylinder 26b is expanded and contracted to swing the side boom 18b up and down, and the side boom 18b is controlled to a constant height.

FIG. 11 is a hydraulic control circuit diagram of the present invention for the swinging hydraulic cylinder 26 of FIGS. 6 and 7. FIG. The manual directional control valve 66 differs from the electromagnetic directional control valve 66b shown in FIG. As a result, each oil chamber of the swinging hydraulic cylinder 26 is connected to the oil tank 58 via the return oil path 64 or from the oil tank 5
8, and the side boom 18 becomes swingable in accordance with external force. Note that the manual directional control valve 66 adopts a position locking system, and can be fixed in the right position in the figure, so that even after the operator takes his hand off the operating lever of the directional control valve 66 during spraying work. , held in the right position. Also, when you want to swing the side boom 18 upward, move it to the left position, when you want to lift and fix the side boom 18, move it to the center position, and when you want to swing the side boom 18 downward, move it to the right position. The good things are the same as before.

Prior to explaining the structure and operation of the main parts of the embodiment, the operation of the parts explained in FIGS. 6 to 11 will be explained.

Prior to spraying the chemical onto the crop 38, the nozzle 3
In order to adjust the height of the crop 38 to a height suitable for the height of the crop 38, a lifting device (not shown) is operated.
Base end side of side boom 18 and center boom 16
Adjust the height. Further, the height adjustment hydraulic cylinder 54 is operated to adjust the length of the stay 32 below the side boom 18 so as to correspond to the height of the base end side of the side boom 18 . Further, the horizontal position of the running wheel 34 is adjusted by operating the left/right adjustment hydraulic cylinder 50 so that the running wheel 34 runs between the ridges of the crop 38 .

Spraying of the chemical from the nozzle 30 is started, and the agricultural riding tractor 10 is driven. As shown in FIG. 12, when the running wheel 11 on one side of the agricultural riding tractor 10 falls into the recess 72 of the ground 40 or rides on a convex part of the ground 40, the agricultural riding tractor 10 moves in the left-right direction. lean towards. Since the running wheels 34 are not attached to the side boom 18b of the conventional boom sprayer 12, as the agricultural riding tractor 10 tilts in the left-right direction, the side boom 18b tilts with respect to the horizontal plane, causing the side boom 18b to tilt. As shown by the two-dot chain line in FIG.
1, the side boom 18 is able to swing relative to the center boom 16, and the stay 32 and running wheels 34 move the tip end of the one-stage portion 20 of the side boom 18, Since the side boom 18 is supported at a constant height from the ground 40, the side boom 18 is held horizontally at a constant height from the ground 40, as shown by the solid line in FIG. 12, so that appropriate spraying can be continued. In addition, in the conventional boom sprayer 12, as shown in FIG. 13, the side boom 18b is supported only at its proximal end.
The distal end of the boom 8b swings a lot, and this swing does not dampen easily. However, in this invention, the side boom 18 is attached to the traveling wheel 3 in addition to the base end.
4, the side boom 18 is supported by the ground 40 even at a location appropriately away from the base end, so the support of the side boom 18 is stabilized, and vibrations at the tip of the side boom 18 can be controlled.

Although a sliding boom has been described above, a folding boom can also be used in the same manner.

FIG. 1 shows the main parts of the embodiment. The lower end of the stay 32 is formed as a fork 72, and the wheel shaft 74 is rotatably supported by the fork 72 via ball bearings 75, 75 at both ends. The drive means 76 is composed of, for example, an engine, electric or hydraulic motor, etc., and is fixed to the stay 32 at a point slightly above the fork 72, and is connected to the control line 77.
is connected to the main body of the boom sprayer 12 via a drive shaft 78 . The sprockets 80 and 82 are connected to the drive shaft 78 and the wheel shaft 7, respectively.
4, and are coupled to enable power transmission via a chain 84 serving as a transmission means. Wheel axle 74
As a transmission means between the drive shaft 78 and the chain 84, various means such as a V-belt and a rope can be used.

When the agricultural riding tractor 10 travels during the spraying operation, the drive means 76 is also driven.
In this way, the drive shaft 78 is rotated, and this rotational torque is transmitted to the wheel axle 74 via the chain 84, and the running wheel 34 is brought into a driving state.
Propulsive force is generated by the frictional force between 4 and the ground 40. As a result, even if the ground 40 is soft or highly uneven, the running wheels 34 smoothly travel on the ground 40 due to the propulsive force of the running wheels 34.

FIG. 2 shows a modification of FIG. 1. In this example, the housing of the drive means 76 is connected to the running wheels 34.
The drive shaft 78 passes through the housing of the drive means 76 and is fixed to the fork 72 of the stay 32 at both ends. Control line 77 corresponds, for example, to an electric motor or a hydraulic motor. Control line 77 leads into the housing of drive means 76 through a hollow bore in drive shaft 78 . In this example, transmission means such as the chain 84 in FIG. 1 can be omitted. In order to synchronize the running speed of the running wheels 34 with that of the agricultural riding tractor 10, the running speed of the running wheels 34, and therefore the drive speed of the drive means 76, can be set constant in advance. However, agricultural passenger tractor 1
0 may change its traveling speed during spraying, and even in such a case, it is necessary to synchronize the traveling speed of the traveling wheels 34 with that of the agricultural riding tractor 10, and for this purpose, FIGS. and will be explained in FIG.

FIG. 3 schematically shows a control device for synchronizing the running speed of the running wheels 34 with that of the agricultural riding tractor 10. As shown in FIG. Electric motor 86 as drive means 76
is provided. The rotational speed control unit 88 is disposed in the main body of the boom sprayer 12 and detects the rotational speed of the rotating shaft of the battery 90 and the running wheel 11 as a power source, and therefore the running speed of the agricultural riding tractor 10. It is connected to a speed sensor 92. The rotation speed control section 88 controls the electric motor 86 based on the detection signal of the speed sensor 92 so that the traveling speed of the traveling wheels 34 becomes equal to the traveling speed of the agricultural riding tractor 10.

FIG. 4 is a block diagram of another control system for synchronizing the running speed of the running wheels 34 with that of the agricultural riding tractor 10. Hydraulic pump 94 is a traveling vehicle
Power is transmitted from the PTO 96 via a transmission means 98. Hydraulic motor 100 as drive means 76
has its driving portion integrally fixed to the wheel shaft 74 and is hydraulically connected to the hydraulic pump 94 via a conduit 102. Rotation speed control section 8
8 is based on the detection signal of the speed sensor 92, for example, the gear ratio of the transmission means 98, and when the hydraulic pump 94 is a swash plate pump, the hydraulic pump 94 is changed by an operation such as changing the inclination angle of the swash plate. The rotational speed of the hydraulic motor 100 also changes accordingly. In this way, the running wheels 34
The rotational speed is controlled so that its running speed is equal to that of the agricultural riding tractor 10.

Further, in FIG. 5, the traveling speed of the traveling wheels 34 is synchronized with that of the agricultural riding tractor 10. 9 is a block diagram of yet another control device, in which a speed sensor 9
Based on the detection signal No. 2, the rotation speed control section 88b controls the engine rotation speed adjustment means to adjust the engine rotation speed and synchronize the running speed of the running wheels 34 with that of the agricultural riding tractor 10.

[Effects of the invention] As described above, according to this invention, the running wheels are driven by a separate drive means, have rotational torque, and generate propulsive force, so that the running wheels can be used for long scattering. Unlike when the wheels rotate passively due to friction with the ground while being carried around by a vehicle, the wheels can run smoothly and without any problems even when traveling on poor ground conditions such as soft ground or highly uneven ground. By synchronously rotating the drive means of a frame body (for example, a tractor) that can run and the separate drive means, the running speed of the frame body and the entrainment by this frame body can be adjusted. Since there is no delay between the speed of the boom and the speed of the boom being applied, the boom does not swing in the direction of travel, and it is therefore possible to prevent damage to crops due to repeated spraying of chemicals.

In addition, during spraying, the wheels of the agricultural riding tractor to which the boom sprayer is attached are attached to the road surface, since the wheels support the area at a certain height from the ground at an appropriate distance from the base end of the spraying means. The spraying means can be maintained at a constant height regardless of the unevenness of the ground, and the delay in following the height control of the spreading means due to changes in the unevenness of the ground can be eliminated, so that the spreading means can always be maintained at an appropriate height. can.

Since the dispersing means is supported not only at the proximal end but also at a location appropriately distant from the proximal end by the running wheels,
In terms of strength and weight, it is possible to achieve a reduction in weight, and the support of the spraying means is stabilized, making it possible to suppress the vibration of the tip of the spraying means during running.

In this invention, the electric and hydraulic circuits that control the swinging hydraulic cylinder based on the sensor and its output can be omitted, so the device can be made inexpensive.

In addition, in the case of completely manual operation, which is generally performed at present, the operator has to carefully operate the directional control valve by visual inspection, which reduces nerves. Completely freed from complicated tasks. Furthermore, according to this invention, since the side boom is supported at two places, it is possible to reduce the strength of the boom or to lengthen the boom.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the main parts of the embodiment, FIG. 2 is a diagram showing a modification of FIG. FIG. 4 is a block diagram of another control device for synchronizing the running speed of the running wheels with that of the agricultural riding tractor, and FIG. 5 is a block diagram of another control device for synchronizing the running speed of the running wheels with that of the agricultural riding tractor. FIGS. 6 and 7 are block diagrams of the control device of the present invention, and FIGS. 8 and 9 are views of an agricultural riding tractor equipped with a boom sprayer according to an embodiment, viewed from the rear and above, respectively.
The figures show the details of the range including the stays, excluding the drive mechanism of the running wheels, from the side and rear of the agricultural riding tractor, respectively. Figure 10 is a conventional hydraulic control circuit diagram of the swinging hydraulic cylinder, and Figure 11. is the hydraulic control circuit diagram of this invention of the swinging hydraulic cylinder,
FIG. 12 is a diagram showing the situation when one running wheel of an agricultural riding tractor falls into a concave part of the ground;
FIG. 13 is a diagram showing vibrations at the tip of a side boom in a conventional boom sprayer. 10... Agricultural riding tractor (travelable frame), 12... Boom sprayer, 18... Side boom (spreading means), 26... Swinging hydraulic cylinder (driving means), 28... Opening/closing hydraulic cylinder (driving means), 32...stay (adjusting means), 34
...Traveling wheels, 38...Crops (spreading material), 74
... Wheel axle, 76 ... Drive means (separate drive means), 86 ... Electric motor (separate drive means), 100
...Hydraulic motor (separate drive means).

Claims (1)

[Claims for Utility Model Registration] (1) A running wheel is attached to the lower side edge of the elongated dispersing means which is extended and swingably fixed to the side of the movable frame via a drive means, and is attached to the lower side edge of the dispersion means through an adjustment means. In the boom sprayer which is pivotally supported, the traveling wheel is pivotally supported by a wheel shaft integrally formed with a separate driving means for driving the traveling wheel, and the traveling wheel is rotated by the driving means, The distance between the spreading means and the object to be spread can be maintained constant at all times, and the rotational speeds of the separate driving means and the driving means of the movable frame are synchronized via a control member. boom sprayer. (2) The boom sprayer according to claim 1, wherein the separate driving means is an engine and a motor. (3) The boom sprayer according to claim 2, wherein the engine and motor rotate a wheel shaft through a transmission means. (4) Utility model registration claim 2, characterized in that the motor is driven by electricity and fluid.
The boom sprayer according to item 1 or 3. (5) The boom sprayer according to any one of claims 2 to 4, wherein the output shaft of the motor is a wheel shaft.