KR20210015666A - Self-propelled medication spreader - Google Patents

Abstract

Provided is a self-propelled chemical spraying machine which improves convenience or safety of a braking mechanism of a spray boom. The self-propelled chemical spraying machine comprises: a travelling vehicle body (A); an operation part (a6); a chemical spraying part (b1) configured to move up and down by extension/contraction of an elevation cylinder (b21); an accumulator (U) connected to the elevation cylinder (b21); an opening/closing valve (u1) configured to open and close a passage for communicating the elevation cylinder (b21) and the accumulator (U); and a control part (C) configured to control the extension/contraction of the elevation cylinder (b21) or the opening/closing of the opening/closing valve (u1) by acquiring operation information of the operation part (a6). The operation part (a6) includes a key switch for turning on the self-propelled chemical spraying machine. The control part (C) performs opening control of the opening/closing valve (u1) on condition that the key switch is turned on, and performs closing control of the opening/closing valve (u1) on condition that the key switch is turned off.

Description

Self-propelled drug spreader {SELF-PROPELLED MEDICATION SPREADER}

The present invention relates to a self-propelled drug spreader for dispersing drugs.

BACKGROUND ART Conventionally, a self-propelled medicament dispersing machine is known in which a drug dispersing device having a dispersing boom for spraying and dispersing drugs such as a control solution is mounted on the front of a traveling vehicle.

For example, Patent Document 1 discloses a self-propelled drug dispersing machine in which an elevating frame is provided on an elevating link that moves up and down by elongation or shortening of an elevating cylinder, and a scattering boom is attached to the elevating frame.

Here, the scatter boom is supported on one side so that one end is supported with respect to the traveling vehicle body and the other end becomes a free end, so if the traveling vehicle body vibrates due to irregularities in the pavement during work, the vibration is transmitted to the scatter boom and vibrates violently. Discard it. As a result, it has been a conventional problem to suppress the vibration of the dispersing boom because unevenness occurs in the dispersing of the drug, leading to a decrease in work efficiency and drug dispersing efficiency.

Therefore, in Patent Document 2, by connecting an accumulator that absorbs pressure fluctuations in the lifting cylinder to the lifting cylinder, a spring action is exerted on the lifting cylinder by the accumulator, thereby reducing the vibration of the lifting frame, thereby reducing the vibration of the scattering boom during work. A technique for suppressing is disclosed. In addition, in Patent Document 3, an on-off valve is provided in the supply/discharge passage of the hydraulic oil of the lifting cylinder and the accumulator, and when the lifting frame is moved up and down, the opening/closing valve is closed to temporarily cut off the supply and discharge of hydraulic oil to the lifting cylinder and the accumulator. As a result, a technique for improving the responsiveness to the lifting operation of the scattering boom is disclosed.

Japanese Patent Laid-Open No. 2019-17310 Japanese Patent Laid-Open No. 2013-102 Japanese Patent Publication No. 2017-23041

Here, according to the self-propelled drug spreader to which the prior art disclosed in Patent Document 2 and Patent Document 3 is applied, when the accumulator absorbs pressure fluctuations in the lifting cylinder and exerts a spring action, the dispersion boom is not fixed with respect to the traveling body of the self-propelled drug spreader. It is made to be able to swing up and down without doing it.

However, in some cases, it is desirable to turn off the spring action by the accumulator during non-working and to fix the spreading boom to the traveling vehicle body. For example, when a self-propelled drug spreader is transported or the like, if the spreading boom is able to swing up and down, there is a fear of contacting an external obstacle by rotation. Therefore, in this case, it is necessary for a conventional operator to manually close the on/off valve provided in the hydraulic oil supply/discharge passage of the lifting cylinder and the accumulator, which is inconvenient. In addition, there was also a concern that the operator would be discouraged from closing the on/off valve and then opening it again during work.

In addition, according to the configuration of closing the on/off valve installed in the supply/discharge passage of the hydraulic oil of the lifting cylinder and the accumulator during the raising and lowering of the dispersion boom, and opening the opening/closing valve after the raising and lowering of the dispersion boom is completed and stopped, At this time, hydraulic oil rapidly flows from the lifting cylinder to the accumulator side due to a pressure difference between the lifting cylinder and the accumulator, and as a result, the lifting cylinder rapidly shortens, causing the scatter boom to descend from the stop position, resulting in a problem that the operation becomes unstable.

As such, the conventional self-propelled drug spreader has room for improvement in terms of convenience and stability in the vibration suppression function of the dispersion boom using an accumulator. Accordingly, an object of the present invention is to solve such a conventional problem by providing a self-propelled drug spreader that improves the convenience and safety of the vibration suppression function of the dispersion boom using an accumulator.

In order to achieve the above object, the invention of claim 1 is a drug configured to be elevated by elongation or shortening of a traveling vehicle body (A) for running the aircraft, an operation unit (a6) for accepting an operator's operation, and an elevating cylinder (b21). An on-off valve (u1) that opens and closes a passage connecting the dispersing part (b1), the accumulator (U) connected to the lifting cylinder (b21) to store pressurized working fluid, and the lifting cylinder (b21) and the accumulator (U) Wow, a self-propelled drug spreader having a control unit (C) configured to be able to acquire operation information of the operation unit (a6), and to control the elongation or shortening of the lifting cylinder (b21) and opening and closing of the on/off valve (u1). , The operation unit (a6) is provided with a key switch to turn on the power of the self-propelled drug spreader, and the control unit (C) opens the on-off valve (u1) under the condition that the key switch is operated to turn on the power of the self-propelled drug spreader. It is characterized in that the on-off valve u1 is closed and controlled under the condition that the power of the self-propelled drug spreader is turned off by a key switch being operated.

In the invention of claim 2, in the self-propelled drug spreader according to claim 1, the control unit (C) is the opening/closing valve for a predetermined set time (t) when an operation of extending or contracting the lifting cylinder (b21) is performed in the operation unit (a6). It characterized in that the (u1) is configured to control the opening after closing control.

The invention of claim 3 is characterized in that, in the self-propelled drug spreader according to claim 2, the set time (t) is within a range of 0.5 seconds to 1 second.

The invention of claim 4 is characterized in that, in the self-propelled drug spreader according to claim 2, the set time (t) can be adjusted by the operation of the operation unit (a6).

According to the invention described in claim 1, the control unit controls the opening of the on-off valve under the condition that the power of the self-propelled drug spreader is turned on by the operation of the key switch, and the power of the self-propelled drug spreader is turned off by the operation of the key switch. The on-off valve is closed and controlled. According to the configuration in which the on-off valve is opened and closed in conjunction with the on-off operation of the key switch by the operator, the on-off valve is reliably opened while the engine is stopped or during engine operation or during operation only by turning on the power. Convenience is improved because the trouble of opening the on-off valve by operation is omitted. In addition, when not working, the vibration suppression function by the accumulator is automatically turned off in conjunction with the key switch off, so that the dispersion boom swings up and down during non-work, such as when transporting a self-propelled drug spreader. It can prevent the possibility of contact with obstacles and improve safety.

According to the inventions described in claims 2 and 3, in addition to the effects of the invention described in claim 1, while securing good responsiveness during the lifting operation of the spreading boom, the vibration suppression function by the accumulator is good even during the lifting operation of the spreading boom after the start of the lift. The scatter boom can be raised and lowered smoothly, and the motion of the scatter boom is stabilized.

According to the invention described in claim 4, in addition to the effect of the invention described in claim 2, it is possible to respond to detailed needs for the weight of the scattering boom and the responsiveness of the operator.

1 is a perspective view of a self-propelled drug spreader according to a preferred embodiment of the present invention.
Figure 2 is a left side view of the self-propelled drug spreader of Figure 1;
3 is a plan view of the self-propelled drug spreader of FIG. 1.
Figure 4 is a front view of the self-propelled drug spreader of Figure 1;
5 is a circuit diagram showing a part of the hydraulic circuit of the self-propelled drug spreader of FIG. 1.
6 is an enlarged view of a main part of the self-propelled drug spreader of FIG. 1.
7 is a flow chart showing the procedure of control by the controller of FIG. 5.
FIG. 8 is a flowchart showing a procedure performed by the controller of the scattering boom lifting process of FIG. 7.
9 is a time chart showing the operation of the accumulator of FIG. 5.
Fig. 10 is a front view of a self-propelled drug spreader according to another embodiment of the present invention.
11 is a circuit diagram showing a part of the hydraulic circuit of the self-propelled drug spreader of FIG. 10.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in the description of the embodiments, the left and right directions are referred to as left and right, respectively, toward the forward direction of the aircraft, and the forward direction is referred to as forward and the backward direction is referred to as rear, but the configuration of the present invention is not limited.

(Full configuration)

An example of the entire configuration of the self-propelled drug disperser 1 will be described in detail.

The self-propelled drug spreader 1 is on the self-propelled traveling vehicle body A and the traveling vehicle body A as shown in a perspective view in Fig. 1, a left side view in Fig. 2, a plan view in Fig. 3, and a front view in Fig. 4, respectively. A drug dispersing device (B) having an installed cabin (K), a drug tank (M) for storing drugs, and a dispersing boom (b1) for distributing drugs supplied from the drug tank (M) onto the packaging. Has been.

The running vehicle body A has a structure including a main frame a1, a driver's seat a2, a steering handle a3, and a front wheel a4 and a rear wheel a5. The main frame a1 is formed to extend in front of and behind the traveling vehicle body A. The driver's seat a2 is a seat for seating when the operator performs a driving operation of the passenger control device 1. At an appropriate position around the driver's seat a2, an operation panel a6 incorporating an operation switch or key switch for controlling operations such as opening and closing of the dispersing boom b1 or dispersing of drugs is disposed.

The steering handle a3 installed upright in front of the driver's seat a2 changes the traveling direction of the self-propelled drug spreader 1 by steering at least the left and right front wheels a4 and a4 by a rotation operation by an operator. That is, the front wheels a4 and a4 are steering wheels that are steered by at least a rotation operation of the steering handle a3.

In the front wheel a4 and the rear wheel a5, the power of the engine in the bonnet a7 is suitably shifted in the transmission case (not shown), and the shifted power is transmitted to rotate and drive.

The cabin K forms a passenger compartment by enclosing the driver's seat a2 and surrounding equipment, steering handles, and the like. The cabin K is arranged between the medicine tank M and the dispersion boom b1. The cabin K is composed of a cabin frame k1, a cabin roof k2, and left and right opening and closing doors k3L and k3R.

The medicine tank M is a container for storing medicines. When viewed from the top, the medicine tank M is disposed on the rear side of the cabin K as shown in Fig. 3, and is formed in a U shape so as to surround both left and right sides and the rear side of the driver's seat a2, and the main frame It is mounted detachably on (a1). In addition, the drugs stored in the drug tank (M) are liquids in which fertilizers, pesticides, etc. are dissolved in a solvent (e.g., water), and liquids (e.g., water) containing solids such as fertilizers and pesticides. It's water.

(Pharmaceutical dispersion device)

The drug dispersing device (B) is configured to include a dispersing boom (b1) to disperse on a pavement, and a distributing device (b2) for distributing the dispersing boom (b1) to the traveling vehicle body (A).

The scatter boom b1 is composed of a center boom b1F located in front of the traveling body 2 and side booms b1L and b1R located in both sides.

The center boom b1F extends horizontally in the vehicle width direction of the traveling vehicle body 2. Further, on the center boom b1F, a plurality of nozzles bn for spraying drugs in the form of fog are disposed at intervals.

The side booms b1L and b1R are arranged to be rotatable on both left and right sides of the center boom b1F. On the side booms b1L and b1R, a plurality of nozzles bn for dispersing drugs in a mist shape are arranged at intervals. With the rotation of the side booms b1L and b1R, the scattering boom b1 extends in the width direction (left and right direction) of the traveling body A so that the entire spreading posture and side booms b1L and b1R are in a straight line. It is possible to switch to the storage posture along the left and right sides of the traveling body 2. The dispersing boom b1 configured in this way can disperse the drugs widely to the left and right of the front side of the self-propelled drug disperser 1 in the dispersing posture.

The land price device (b2) is a device that supports the scattering boom (b1) on the traveling vehicle body (A) so as to be elevated and lowered as shown in Figs. 2 and 3, and is rotated by elongation or shortening of the lifting cylinder (b21). The link b20, the attachment frame b21 connected to the front end of the elevating link b20, the elevating frame b23 attached to the attachment frame b22 and moving up and down by the rotation of the elevating link b20, and both sides It is constituted by including the opening and closing cylinders b24 and b24 for opening and closing the side booms b1L and b1R of the room by rotating substantially horizontally. As shown in FIG. 4, the attachment frame (b22) forms a rectangular frame shape when viewed from the front, and the lifting frame (b23) is rotated around the rolling axis (Y) by the rolling axis (Y) formed at the bottom. It is configured to pivot possible.

Center booms (b1) (b1F) are attached to the front part of the lifting frame (b23), and side booms (b1L, b1R) are pivotably attached to the left and right sides of the lifting frame (b23) so that they can be deployed in the vehicle width direction. Has been. With this configuration, when the lifting frame b23 is raised and lowered, the scattering boom b1 is also configured to be raised and lowered.

The opening/closing cylinders b24 and b24 are capable of switching to a dispersion posture extending in the vehicle width direction of the traveling body A by extension or shortening, and a storage posture along both left and right sides of the traveling body A, and the lifting frame ( b23) and the side booms b1L and b1R, and when the opening/closing cylinders b24 and b24 are extended or shortened, the side booms b1L and b1R on both sides are configured to rotate. Further, the extension or shortening of the opening/closing cylinders b24 and b24 is controlled by a controller C described later.

(Scatter boom vibration suppression device)

As shown in FIG. 4, on the lifting frame b23, the accumulator U which absorbs pressure fluctuations in the lifting cylinder b24 is attached.

5 is a circuit diagram showing a part of the hydraulic circuit of the self-propelled drug spreader 1.

As shown in Fig. 5, the vibration suppression mechanism of the scattering boom b1 includes an on/off valve u1 provided in the supply/discharge passage of hydraulic oil that communicates the accumulator U, the lifting cylinder b21 and the accumulator U, and an on/off valve. It is comprised with the controller C which can control the opening and closing of (u1).

The first to second pumps P1 and P2, which are hydraulic pumps, are constituted by constant displacement gear pumps driven by the power of the engine. The discharge flow path 100 for circulating the hydraulic oil discharged from the first and second pumps P1 and P2 is connected to a first positive classification valve u2 for classifying a constant flow rate. The first positive classification valve u2 is connected to the second positive classification valve u3 by a first flow path 101. The second normal classification valve u3 is connected to a discharge flow path 100a through which discharge oil (pilot oil) discharged from the third pump P3 flows. It is connected to the vertical movement switching valve u4 by the 2nd flow path 102.

The vertical movement switching valve u4 is an electromagnetic switching valve, an extended position u41 as an operating position for extending the lifting cylinder b21, a contracted position u42 as an operating position for contracting the lifting cylinder b21, and lifting Switching to the stop position u43 for stopping the cylinder b24 is enabled.

The vertical movement switching valve u4 supplies hydraulic oil to the hydraulic oil tank T and the third flow path 103 communicating with the left and right lifting cylinders b21 and b21 and the on/off valve u1 in addition to the second flow path 102. It is connected with the discharge flow path 104 which turns. A relief valve u5 is provided between the second flow path 102 and the discharge flow path 104, and when the hydraulic pressure of the second flow path 102 exceeds a set value, the hydraulic pressure is changed to the discharge flow path 104. It is supposed to be discharged.

When the vertical movement switching valve u4 is switched to the extended position u41, the second flow path 102 and the third flow path 103 communicate, and accordingly, the hydraulic oil discharged from the first to second pumps P1 and P2 is It flows into the piston side chambers b211 and b211 of the lifting cylinders b21 and b21 through the discharge passage 100, the first passage 101, the second passage 102, and the third passage 103. Accordingly, since the lifting cylinders b21 and b21 are elongated, the lifting link b20 is rotated upward according to this, so that the lifting frame b23 moves upward, and the scatter boom b1 moves together with the lifting frame. 2) about rising.

When the vertical movement switching valve u4 is switched to the retracted position u42, the discharge flow passage 104 and the third flow passage 103 communicate. Accordingly, the hydraulic oil in the piston side chambers b211 and b211 of the lifting cylinders b21 and b21 is returned to the hydraulic oil tank T through the third flow path 103 and the discharge flow path 104. Accordingly, since the lifting cylinder b21 is contracted, the lifting link b20 is rotated downward so that the lifting frame b23 moves downward, and the scattering boom b1 is the traveling body A together with the lifting frame b23. Descend against.

When the vertical movement switching valve u4 is switched to the stop position u43, the third flow path 103 is closed. Accordingly, hydraulic oil entering and leaving the piston side chambers b211 and b211 through the third flow path 103 is blocked, so that the height of the scattering boom b1 with respect to the traveling vehicle body A is maintained.

The on-off valve (u1) is an electromagnetic switching valve, and the communication position (u11) for communicating the piston side chamber (b211) of the lifting cylinder (b21) and the accumulator (U), and the shut-off position (u12) for blocking communication can be switched. It is supposed to be done.

When the opening/closing valve u1 is switched to the communication position u11 (open control of the opening/closing valve u1), the third flow path 103 and the accumulator U communicate, and accordingly, the piston side chamber of the lifting cylinder b21 ( b211) and the accumulator U are communicated. Accordingly, the accumulator U absorbs the pressure fluctuations in the lifting cylinder b21 and exerts a spring action as the hydraulic oil flows in and out of both, thereby suppressing the vibration of the scattering boom b1 and exerting a vibration suppression function.

When the on/off valve u1 is switched to the shut-off position u12 (close control of the on/off valve u1), communication between the third flow path 103 and the accumulator U is blocked, and thus the piston of the lifting cylinder b21 Communication between the side chamber b211 and the accumulator U is cut off. Accordingly, it is possible to stop the vibration suppression function by the accumulator U and improve responsiveness when raising and lowering the dispersion boom b1. In addition, the responsiveness specifically refers to the rapidity from the operation of the boom raising switch or the boom lowering switch until the elevating operation of the spread boom b1 is started.

The controller C is a control device capable of controlling the vertical movement switching valve u4 and the on/off valve u1, and includes a CPU, ROM, RAM, etc., and stores a predetermined control program. Further, the vertical movement switching valve u4 and the on-off valve u1 are electrically connected to the controller C, and are controlled by the controller C, so that the positions can be switched. Further, the controller C may have a configuration capable of controlling the positions of the vertical movement switching valve u4 and the on-off valve u1 using a timer, a relay, or the like, without using a CPU, ROM, RAM, or the like.

The controller C is electrically connected to the operation panel a6, and is capable of acquiring operations of various operation switches provided on the operation panel a6 as signals. That is, it is possible to acquire operation information of the operation panel a6 by an operator. The operation panel (a6) includes at least a boom lift switch (not shown) operated when raising the dispersion boom (b1) with respect to the traveling vehicle body (A) and a boom operated when raising the dispersion boom (b1) with respect to the traveling vehicle body (A). The descending switch and the self-propelled drug spreader 1 are provided with a key switch operated when the power is turned on. In addition, the key switch is an operation switch capable of switching on and off, and that the key switch is in the ON state is a condition for the engine operation of the self-propelled drug spreader 1. Therefore, the operator can operate the engine of the self-propelled drug spreader 1 by performing a predetermined operation after turning on the key switch. The controller C executes control to be described later based on a signal from the operation panel a6, and switches the positions of the vertical movement switching valve u4 and the on-off valve u1. Further, to the controller C, a timer c1 as a timing means and a relay c2 which detects an operation of a key switch and performs contact switching in a circuit are connected.

6 is an enlarged view of a main part of the self-propelled drug spreader 1 in front.

As shown in FIG. 6, the accumulator U is disposed at the approximately center left and right of the lifting frame b23 in front of the cabin K, and is located on the approximately center line in the vehicle width direction of the traveling vehicle body 2. Accordingly, the accumulator U disposed approximately in the center of the traveling vehicle body A becomes a center marker, so that the operator can easily operate the self-propelled drug spreader 1 to go straight. In addition, it becomes easy to recognize a failure of the accumulator U, and maintainability is improved.

In addition, the on-off valve u1 is accommodated in the housing X1 disposed under the accumulator U shown in FIG. 6, and the vertically moving switching valve u4 is disposed close to the side of the housing X1. It is accommodated in the housing X2. Further, the accumulator U may be configured to be detachable from the housing X1. As shown in Fig. 6, the housing X1 and the housing X2 are closely attached and fixed on the elevating frame b23, and the on/off valve u1 and the vertically moving switching valve u4 are arranged in close proximity. have. Further, the housing X1 and the housing X2 may be configured as one housing, and the on-off valve u1 and the vertical movement switching valve u4 may be accommodated in one housing. Thus, according to the configuration in which the on-off valve u1 and the vertical movement switching valve u4 are directly mounted integrally, the assembling property is good, the number of assembling labor can be reduced, and the arrangement space can be made compact.

The accumulator U, the housing X1, and the housing X2 are configured to be installed in the front portion of the body of the traveling vehicle body 2. Specifically, it is configured to be installed in the foremost part of the body. Accordingly, maintenance management becomes easy. Further, the scattering boom b1 to which the nozzle bn is attached is configured to be able to move up and down to an arbitrary position by raising and lowering the lifting frame b23. The accumulator U, the housing X1, and the housing X2 are attached to the lifting frame b23.

Accordingly, the accumulator (U), the housing (X1), and the housing (X2) can be moved up and down to an arbitrary position while maintaining their respective positional relationship, so there is no effect on the piping, and maintenance is easy. It becomes.

(Open/close control of open/close valve)

7 is a flow chart showing the procedure of control by the controller C.

The controller C controls the on-off valve u1 and the vertical movement switching valve u4 according to the sequence shown in the flow chart of FIG. 7. Further, the key switch is operated off as an initial condition, and the on-off valve u1 is switched to the cut-off position u12.

The controller C controls to switch the on/off valve u1 to the communication position u11 when acquiring the signal in which the key switch is turned on (step S101) (step S102). Thereby, the vibration suppression function by the accumulator U is exhibited, and the vibration of the scattering boom b1 is suppressed. According to the configuration in which the on-off valve (u1) is opened in conjunction with the operator's ON operation of the key switch, the on-off valve (u1) is reliably opened in a state in which the engine is stopped or in operation, or during operation only by turning on the power. State. Accordingly, since the time for the operator to open the on-off valve u1 by manual operation as in the prior art is omitted, convenience is improved. In addition, there is no need for an operator to lose sight of the operation of opening the on-off valve u1 by manual operation during work. Further, a switch for turning on/off the on-off valve u1 becomes unnecessary.

Subsequently, when the controller C acquires a signal in which the boom raising switch is turned on or the boom lowering switch is turned on (step S103), it executes the raising and lowering processing of the spreading boom b1 to be described later (step S104).

Further, the controller C controls the on-off valve u1 to switch to the communication position u11 in step S102, and then acquires a signal in which the key switch is turned off (step S105), the on-off valve u1 is turned off. Control is performed to switch to (u12) (step S106). Accordingly, the vibration suppression function by the accumulator U is stopped in conjunction with the off operation of the key switch. In this way, according to the configuration in which the dispersion boom b1 is fixed to the traveling vehicle body A by automatically turning off the vibration suppression function by the accumulator U at the time of non-work, for example, the self-propelled drug sprayer 1 It is possible to prevent the possibility of contact with external obstacles by the scattering boom (b1) swinging up and down during non-work, such as when transporting. In addition, since the on-off valve u1 is switched to the cut-off position u12 when the accumulator U is separated and maintenance is performed, dust or the like can be prevented from entering the hydraulic circuit.

Fig. 8 is a flow chart showing a procedure performed by the controller C of the scattering boom lifting process (step S104) of Fig. 7. When the controller C acquires a signal in which the boom up switch is turned on or the boom down switch is turned on in step S103, and acquires the signal in which the boom up switch is turned on, the vertical movement switching valve u4 is moved to the extended position ( Switch to u41) and raise the scatter boom (b1). When a signal in which the boom lower switch is turned on is acquired, the vertical movement switching valve u4 is switched to the retracted position u42, and the scattering boom b1 is lowered (step S201).

At the same time, the on-off valve u1 is immediately switched to the shut-off position u12 (step S202). Thereby, the responsiveness of the continuing elevation of the scattering boom b1 can be improved.

Here, the controller C counts the set time t by starting the timer c1 at the same time as the start of raising and lowering the scattering boom b1 (step S203). This setting time t is set in advance for a predetermined short time, for example, about 1 second.

Subsequently, the controller C switches the on-off valve u1 to the communication position u11 when the set time t has elapsed (step S204). That is, the controller C immediately switches the on/off valve u1 to the shut-off position u12 for only a short time immediately after the start of the lifting operation of the spreading boom b1, and during the lifting operation of the spreading boom b1 after the start of lifting. The on-off valve u1 is switched to the communication position u11. As a result, rapid response can be ensured during the lifting operation of the scattering boom b1, and during the lifting operation of the scattering boom b1 after the continuation of lifting and lowering, the accumulator U provides a vibration suppression function. The vibration of (b1) can be reduced. As a result, the operation of the scattering boom b1 is stabilized and safety can be improved. That is, according to the configuration in which the on/off valve u1 is opened and controlled after the elevating operation of the scattering boom b1 is completed as in the related art, when the on/off valve u1 is opened, the hydraulic oil of the lifting cylinder b21 and the accumulator U Due to the pressure difference, hydraulic oil rapidly flows from the lifting cylinder (b21) to the accumulator (U) side, and as a result, the lifting cylinder (b21) is extended or shortened, causing the dispersion boom (b1) to descend from the stop position, resulting in unstable operation. Although there was a concern, by controlling the opening and closing valve u1 during the lifting operation of the dispersion boom (b1), the pressure difference between the hydraulic oil between the lifting cylinder (b21) and the accumulator (U) can be eliminated, and a stable operation of the dispersion boom (b1) can be achieved. I can. Here, the setting time t is preferably set within 0.5 seconds to 3 seconds, and more preferably within 0.5 seconds to 1 second.

Subsequently, the controller C controls to switch the vertical movement switching valve u4 to the stop position u43 when acquiring a signal in which the boom up switch or the boom down switch is turned off (step S205) (step S206). Thereby, the elevating and descending of the dispersion boom b1 is stopped, and the elevating process of the dispersion boom b1 in FIG. 7 (step S104) is completed.

In addition, although not shown in Figs. 7 and 8, if the boom raising switch or the boom lowering switch is continuously operated for a predetermined time (about 0.5 seconds to about 1 second), the spreading boom b1 is not raised and lowered, and the on/off valve u1 ) Is closed manually. In this case, other switches or levers may be provided instead of the boom raising switch or the boom lowering switch. This makes it possible to easily stop the operation of the accumulator U in a situation where it is not necessary to operate the accumulator U at the discretion of the operator (for example, a situation where the unevenness of the road surface is small). In addition, when operating the accumulator U again, the boom raising switch or the boom lowering switch is continuously operated at a predetermined time (about 0.5 seconds to about 1 second). Accordingly, a switch for turning on/off the on-off valve u1 becomes unnecessary.

Further, a vibration sensor may be provided on the gas, and when the vibration of the gas is within a predetermined value and continues for a predetermined time or longer, the on-off valve u1 may be automatically closed to stop the accumulator U from operating. However, if the vibration value of at least several times or more continues, the on-off valve u1 is automatically opened to operate the accumulator.

In addition, the boom raising switch and the boom lowering switch are provided at positions that can be operated while seated on the driver's seat a2 in the cabin K, but are provided in addition to the cabin K. As shown in Fig. 2, since the side boom b1L passes through the side of the opening/closing door k3L, it is possible to get on and off the lower side of the side boom b1L when ascending and descending, but the side boom b1L ) To make it easier to get on and off. Therefore, the side boom b1L is configured to be able to move up and down by operating the boom raising switch or the boom lowering switch provided outside the cabin K.

The side booms b1L and b1R are configured to be liftable independently from the lift frame b23, and are configured to be liftable with an electric hydraulic cylinder ES independent from the hydraulic circuit of FIG. 5. In this case, even though the engine is stopped and hydraulic pressure is not operating, the side booms b1L and b1R operate the boom up switch and the boom down switch other than the cabin K to operate the electric hydraulic cylinder ES using the power of the battery. It goes up and down by driving. Accordingly, it becomes easy to ascend and descend into the cabin K.

9 is a time chart showing the operation of the accumulator U of FIG. 5.

In addition, in FIG. 9, when the accumulator U is on, the on-off valve u1 is in the communication position u11, and when the accumulator U is off, the on-off valve u1 is in the cut-off position u12. As shown in Fig. 9, when the key switch is on, the accumulator (U) is normally turned on, but the accumulator (U) is turned off for a set time (t) from immediately after the boom up switch is turned on or the boom down switch is turned on. Is composed. In addition, the setting time (t) is set in advance for a short time (e.g., about 1 second) as described above, but the responsiveness of raising and lowering the dispersion boom (b1) according to the weight of the dispersion boom (b1) and the needs of the operator In order to realize this, it is possible to adjust to a predetermined range (for example, about 0.5 to 3 seconds) by operation of the operation panel a6.

It goes without saying that the present invention is not limited to the above embodiments, and various modifications are possible within the scope of the invention described in the claims, and they are also included within the scope of the present invention.

For example, in the above embodiment, as shown in Fig. 4, the lifting frame b23 is centered on the rolling axis Y by the rolling axis Y formed under the attachment frame b22, and can be rotated. Although it was configured to pivot so as to be pivoted, as shown in FIG. 10, a single-acting roll cylinder (b25) is disposed on the left and right one ends of the lifting frame (b23), and a damper (b26) is disposed on the other left and right ends, and the single-acting roll cylinder is It is good also as a structure in which rolling control of the lifting frame b23 is carried out by the extension or shortening of (b25). At this time, by performing the return operation of the single-acting roll cylinder (b25) by the dampers (b26) disposed on the other ends of the left and right, it is possible to suppress the shaking vibration in the rolling direction of the elevating frame compared to the case of using an elastic body such as a compression spring. , Stable roll control becomes possible.

11 is a circuit diagram showing a part of a hydraulic circuit of the self-propelled drug spreader 1 according to another embodiment. In the hydraulic circuit of the self-propelled drug spreader 1 according to another embodiment, in addition to the configuration of the hydraulic circuit shown in Fig. 5, the fourth flow path 105 is connected to the first normal classification valve u2, and the fourth flow path An electronic switching valve that can be switched to an extended position (u51) as an operating position for extending the single-acting roll cylinder (b25) to 105, a retracted position (u52) as an operating position to be retracted, and a stop position (u53) to stop. The single-acting roll cylinder switching valve (u5) is connected. The lifting frame b23 is pivoted so as to be rotatable around the rolling axis Y, and the accumulator U2 performs vibration suppression in the rolling direction of the lifting frame b23.

As shown in Fig. 11, the single-acting roll cylinder switching valve u5 is connected to the fifth flow path 106, and the fifth flow path 106 is the piston side chamber b251 of the single acting roll cylinder b25, and A communication position u71 communicating with the accumulator U2 and a blocking position u72 for blocking communication are connected to a second on-off valve u7 capable of switching. The controller C controls the on-off valve u7 to switch to the communication position u71 when acquiring a signal in which the key switch is turned on. Thereby, the vibration suppression function by the accumulator U2 is exhibited, and vibration in the rolling direction of the lifting frame b23 can be suppressed. In addition, since the on-off valve u7 is switched to the cut-off position u72 when the accumulator U2 is separated and maintenance is performed, dust or the like can be prevented from entering the hydraulic circuit.

In addition, the single-acting roll cylinder switching valve u5 is connected to the second discharge passage 107 for returning the hydraulic oil to the hydraulic oil tank T, and a relief between the fourth passage 105 and the second discharge passage 107 A valve u6 is installed. Further, although not shown, the single-acting roll cylinder switching valve u5 and the second on-off valve u7 are connected to the controller C, and the position can be controlled by the controller C. Further, the single-acting roll cylinder switching valve u5 and the second on-off valve u7 are accommodated in the housing X3 shown in FIG. 10.

Here, when viewed from the plane of the gas, the accumulators U and U2 may be disposed on either the left or the right side of the center line in the gas traveling direction, and the hydraulic valve may be disposed on the other side. By distributing the heavy accumulator and hydraulic valve to the left and right with respect to the center line in the gas traveling direction, the left and right balance of the gas is improved.

Further, the on-off valve to the accumulators U and U2 may be opened, and an indicator indicating a state in which the accumulators U and U2 can be operated may be provided in the vicinity of the key switch or around the handle of the operation unit. Accordingly, the operator can easily check the operating conditions of the accumulators U and U2 while stopping or driving (working, moving). This configuration is particularly effective when there is no on-off switch for operating the accumulators U, U2 (a configuration in which the accumulators U, U2 are automatically operated in conjunction with on-off of the key switch).

A: running body a1: main frame
a2: driving seat a3: steering handle
a4: front wheel a5: rear wheel
a6: control panel a7: bonnet
B: drug dispersing device bn: nozzle
b1: scatter boom b2: land price device
b20: lifting link b21: lifting cylinder
b22: attachment frame b23: elevating frame
b24: open/close cylinder b25: single-acting roll cylinder
K: cabin k1: cabin frame
k2: Cabin roof k3L, k3R: opening door
T: hydraulic oil tank U: accumulator
U2: Roll accumulator P1: 1st pump
P2: second pump u1: on-off valve
u2: first positive classification valve u3: second positive classification valve
u4: vertical movement switching valve u5: cylinder switching valve for single-acting rolls
u6: relief valve u7: second on-off valve
Y: rolling axis

Claims (4)

A running vehicle body (A) that runs the aircraft,
An operation unit (a6) that accepts an operator's operation,
A drug dispersing portion (b1) configured to be elevated by elongation or shortening of the elevating cylinder (b21),
An accumulator (U) connected to the lifting cylinder (b21) and storing the pressurized working fluid,
An on-off valve u1 for opening and closing a passage communicating the lifting cylinder b21 and the accumulator U,
A self-propelled drug spreader comprising a control unit (C) configured to be capable of acquiring operation information of the operation unit (a6), and configured to control elongation or shortening of the lifting cylinder (b21) and opening and closing of the on/off valve (u1),
The operation unit (a6) is provided with a key switch to turn on the power of the self-propelled drug spreader,
The control unit C controls the opening of the on-off valve u1 on condition that the key switch is operated to turn on the power of the self-propelled drug disperser, and
A self-propelled drug spreader, characterized in that the on-off valve (u1) is closed and controlled on condition that the power of the self-propelled drug spreader is turned off by a key switch being operated. The method of claim 1,
When the control unit C is operated to extend or shorten the lifting cylinder b21 in the operation unit a6,
Self-propelled drug spreader, characterized in that configured to control the opening after closing the on-off valve (u1) for a predetermined set time (t). The method of claim 2,
A self-propelled drug spreader, characterized in that the set time (t) is within a range of 0.5 seconds to 1 second. The method of claim 2,
Self-propelled drug spreader, characterized in that the set time (t) can be adjusted by the operation of the operation unit (a6).

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