JP2587989B2 - Spreading amount adjusting device in power spreader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is used in a power spraying machine that sprays a spraying agent stored in a storage tank through a supply passage by an airflow of a blowing fan, and The present invention relates to a spray amount adjusting device for adjusting the spray amount.

[Conventional technology]

Conventionally, various types of power spreaders have been provided, and as an example thereof, a backpack type power spreader α is shown in FIGS. 9 to 12.

9 is a front view, FIG. 10 is a longitudinal sectional view thereof, and FIG. 11 is a rear view (a view showing a surface located on the back side of the worker).
FIG. 12 is a longitudinal sectional view showing the opening / closing control valve 1 constituting the conventional spray amount control device b.

9 to 11, reference numeral 2 denotes a storage tank for storing the sprayed agent 3, reference numeral 4 denotes a blower fan provided in a fan case 5, reference numeral 6 denotes an engine for operating the blower fan 4, and reference numeral 7 denotes the engine 6 These fuel tanks are attached to a backpack frame 8 to form a main body 9. When the blow fan 4 is rotated by the engine 6, air is sucked from the outside, and as shown in FIG.
The air is discharged to an outlet 12 through a main air passage 10 and a main air passage 11 following the main air passage 10. In addition, a part of the air is sent into the storage tank 2 through the fork blowing passage 13 branched from the blowing passage 10, and the spraying agent 3 in the storage tank 2 is agitated. The sprayed agent 3 is supplied to the main air passage 11 through the supply passage 14. A discharge pipe 15 is connected to the discharge port 12 as shown in FIG. Therefore, the fan 4
The spraying agent 3 stored in the storage tank 2 is sprayed from the ejection port at the tip of the injection pipe 15 by the air flow of the above.
In the spraying operation, the worker carries the main body 9 on the back using the backpack frame 8, and performs the spraying operation while holding the injection tube 15 in his hand.

Conventionally, the power sprayer a has been provided with a spray amount adjusting device b described below. That is, the spray amount adjusting device b is disposed on the openable and closable adjusting valve 1 provided in the supply passage 14 and the operation stay 16 attached to the side of the backpack frame 8 as shown in FIG. The spread amount adjustment lever 17 is connected between the spread amount adjustment lever 17 and the opening / closing adjustment valve 1, and the operation of the spray amount adjustment lever 17 is mechanically transmitted to open / close the opening / closing adjustment valve 1. Rod 18 that opens and closes
And the like. As shown in FIG. 12, the opening / closing control valve 1 is provided with a pair of slides in which supply holes 19a and 20a for the sprayed agent 3 are provided, one of which is fixed and the other is slidable with respect thereto. It is composed of moving plates 19 and 20. The other slide plate 20 has a pair of protrusions.
21a and 21b are protruded, and a projection 23 protruding from the shaft 22 is inserted therebetween. When the shaft 22 rotates, the projection 23 is
The sliding plate 20 slides in the left-right direction in FIG. 12 by contacting the projections 21a or 21b of the slide 20. As shown in FIG. 11, one end of the shaft 22 is guided to the outside and linked to the rod 18 so that the shaft 22 rotates when the spray amount adjusting lever 17 is operated.

Therefore, according to the spray amount adjusting device b, by operating the spray amount adjusting lever 17, the sliding plate 20 slides, the opening is adjusted, and the spray amount of the spraying agent 3 is reduced. It was something that could be adjusted.

In FIG. 11, reference numeral 24 denotes a throttle operation lever disposed on the operation stay 16, and by operating the throttle operation lever, the number of revolutions of the engine 6 can be set.

However, the conventional spray amount adjusting device b is configured so that the operation of the spray amount adjusting lever 17 is mechanically transmitted by a link mechanism such as a rod 18 to open and close the open / close metering valve 1. Therefore, the spray amount adjustment lever
Because of the positional relationship between the opening 17 and the opening / closing control valve 1, the link mechanism such as the rod 18 cannot be covered with a cover or the like and must be protruded from the main body 9. Therefore, the link mechanism such as the rod 18 is covered. There was a drawback that the material was rusted under the influence of the spraying agent 3 and the like, and the amount of the spraying agent 3 could not be adjusted.

The spray amount adjusting lever 17 is located at a position in front of the worker in relation to the link mechanism such as the rod 18, for example, the injection pipe 15.
At the same time, it could only be installed at the position as shown in Fig. 11 at best, so the operability was poor and the operator could not visually check the operation state of the spraying amount adjustment lever 17, so the opening and closing adjustment desired by himself There is a disadvantage that the opening of the quantity valve 1 cannot be set reliably.

Further, even if the spraying operation is completed, the open / close metering valve 1 cannot be fully closed unless the operator operates the spraying amount adjusting lever 17, so that the operator does not perform this operation at the time of the end of the spraying operation. If the operator forgets the above, there is a disadvantage that the spraying agent 3 in the storage tank 2 is unnecessarily spilled from the supply passage 14 to the discharge port 12 or the jet pipe 15.

[Problems to be solved by the invention]

SUMMARY OF THE INVENTION The present invention has been made in view of the above prior art, and has as its object to provide a spraying amount adjusting device for a power spraying machine which does not have a possibility of making the adjustment of the spraying amount impossible and has good operability.

In addition, according to a part of the present invention, in addition to the above-described object, there is provided a spray amount adjusting device in a power spraying machine in which a spraying agent in a storage tank does not needlessly spill to a jet pipe or the like. The purpose is also.

[Means for solving the problem]

In order to solve the above-mentioned problem, the invention according to claim (1) is directed to a power spraying machine that sprays a spraying agent stored in a storage tank by an airflow of a blowing fan through a supply passage. An opening / closing metering valve provided, an actuator for opening / closing the opening / closing metering valve, opening degree detecting means for outputting a detection signal corresponding to an opening degree of the opening / closing adjusting valve, and a target opening / closing adjustment valve. A drive for driving the actuator such that a target signal corresponding to the opening of the quantity control valve and a detection signal of the opening detection means are input and based on these, the opening of the opening / closing control valve becomes the target opening. A circuit, and setting means for setting an opening degree of the open / close metering valve desired by an operator and outputting a setting signal corresponding to the set opening degree;
Fully-closed command means for outputting a fully-closed signal according to the fully-closed state of the opening / closing control valve, operation state detection means for detecting an operation state of the blower fan, and receiving a signal from the operation state detection means, When the blower fan is not in the predetermined operation state, the fully closed signal of the fully closed command means is input to the drive circuit as the target signal, and when the blower fan is in the predetermined operation state, the set signal of the setting means is input to the drive circuit. The first switching means is provided.

Further, in the invention according to claim (2), in the invention according to claim (1), the setting means is a storage means, and the opening degree of the opening / closing metering valve desired by the operator in the storage means. And a data setting means capable of storing data corresponding to the data, and outputting a signal corresponding to the data stored in the storage means as a setting signal.

Further, in the invention according to claim (3), in addition to the components of the invention according to claim (1) except for the first switching means, the opening and closing control valve is operated by an operator. A release operation means for outputting a full-close release signal for releasing the full-closed state of the air-conditioning apparatus, and receiving signals from the operation state detection means and the release operation means, so that when the blower fan is not in a predetermined operation state, The fully closed signal of the closing command means, in the case where the blower fan is in a predetermined operating state, when receiving the fully closed release signal, the setting signal of the setting means,
Second switching means for inputting the full-close signal of the full-close command means to the drive circuit as the target signal when the full-close release signal is not received is provided.

Still further, in the invention according to claim 4, the setting means is a storage means, and a data setting capable of storing data corresponding to the opening degree of the opening / closing control valve desired by the operator in the storage means. Means for outputting a signal corresponding to the data stored in the storage means as a setting signal.

(Operation)

According to the present invention, an actuator for opening and closing the on-off control valve, an opening detecting means for outputting a detection signal according to the opening of the on-off control valve, and a target opening of the on-off control valve And a drive circuit for driving the actuator so that the opening degree of the opening / closing control valve becomes the target opening degree based on the received target signal and the detection signal of the opening degree detection means. Therefore, when the actual opening of the opening / closing adjustment valve is different from the target opening, the actuator is driven by the drive circuit, and the actual opening of the opening / closing control valve always coincides with the target opening. It is something that can be done.

By the way, in the embodiment of the present invention shown in FIGS. 1 to 4, the opening degree of the opening / closing control valve desired by the operator can be set, and a setting signal corresponding to the set opening degree is output. Since the setting signal to be set is provided and the setting signal of the setting means is input to the drive circuit as the target signal, the opening degree of the opening / closing control valve becomes the opening degree set by the setting means. By operating the means, the degree of opening of the opening / closing control valve can be arbitrarily set, whereby the amount of the agent to be sprayed can be freely adjusted.

And the rod in the conventional spray amount adjusting device b.
Since there is no equivalent to a link mechanism such as 18 and the opening and closing adjustment valve is opened and closed by the drive circuit and the actuator, these can be covered with a cover or the like, and they do not protrude from the main body. There is no danger that the application amount cannot be adjusted due to sticking or the like. Further, the setting means includes a spray amount adjusting lever 17 connected to a link mechanism in the conventional spray amount adjusting device b.
Unlike the one that outputs an electrical setting signal, the mounting position is not restricted and the position in front of the worker can be
For example, it can be provided in the injection pipe, which can improve the operability, and allows the operator to visually check the setting state of the setting means, so that the desired opening degree of the open / close metering valve can be reliably set. It is.

Further, in the invention according to claim (1), similarly to the embodiment on which the present invention is based, the opening degree of the opening / closing control valve desired by the operator can be set, and the opening degree can be set according to the set opening degree. A setting means for outputting a setting signal is provided.
Fully-closed command means for outputting a fully-closed signal according to the fully-closed state of the opening / closing control valve, operation state detection means for detecting an operation state of the blower fan, and receiving a signal from the operation state detection means, When the blower fan is not in the predetermined operation state, the fully closed signal of the fully closed command means is input to the drive circuit as the target signal, and when the blower fan is in the predetermined operation state, the set signal of the setting means is input to the drive circuit. Since the first switching means is provided, when the blower fan is performing a predetermined operation, that is, at the time of spraying work, a setting signal of the setting means is input to the drive circuit as the target signal, and As in the embodiment of the present invention, the opening of the on-off metering valve is the opening set by the setting means,
The operator can arbitrarily set the degree of opening of the on-off metering valve by operating the setting means, and can freely adjust the amount of the agent to be sprayed. Further, when the blower fan is not in the predetermined operation state, that is, at the end of the spraying operation, the fully-closed signal of the fully-closed command means is input to the drive circuit as the target signal. Is completely closed.

Therefore, according to the invention of claim (1), there is no danger that the spraying amount cannot be adjusted due to rust or the like in the embodiment which is the basis of the present invention, and operability is improved. In addition, it is impossible to forget to open the open / close metering valve at the end of the spraying operation, and there is no possibility that the sprayed agent in the storage tank may unnecessarily spill into the jet pipe or the like.

Also, in the invention according to claim (2), in the invention according to claim (1), the setting means includes a storage means and a data setting means, and corresponds to data stored in the storage means. Since the configuration is such that the signal is output as the setting signal, the same operation as the invention according to claim (1) is performed, and the setting signal once set by the operator is surely kept as it is unless reset again. As a result, the opening / closing control valve does not shift to an unintended opening degree during the spraying operation. In other words, for example, only a variable resistor can be used as the setting means, but in that case, depending on the type of the knob or the operation lever, the operator may operate it incorrectly or during spraying work. The resistance value of the variable resistor may be shifted by receiving the generated vibration or the like, and an erroneous setting signal may be output. Therefore, the opening and closing metering valve may be shifted to an unintended opening degree by the operator during the spraying operation. However, according to the invention of claim (2), there is no possibility that such inconvenience occurs.

Further, according to the invention according to claim (3), basically, the same operation as the invention according to claim (1) is performed, but a releasing operation means is added and the first switching means is provided. Since the second switching means is provided instead of
This is convenient for checking an engine or the like for operating the blower fan. That is, in the invention according to claim (1), when the rotation speed of the engine or the like is increased by the operation of the first switching means to bring the blower fan into a predetermined operating state, the opening / closing control valve is automatically opened. Since the degree becomes the opening determined by the setting signal, when the rotation speed is increased for inspection of the engine or the like, the opening degree of the open / close metering valve is set to be fully closed by the setting means in advance. If forgetting to do so, the opening / closing metering valve will be opened carelessly and the agent to be sprayed will be sprayed, which is inconvenient for checking the engine and the like. On the other hand, according to the invention of claim (3),
Due to the operation of the release operation means and the second switching means, even if the rotation speed of the engine or the like is increased and the blower fan is set to the predetermined operation state, it is opened and closed as long as the operator does not operate the release operation means regardless of the setting state by the setting means. Since the metering valve is fully closed, the spraying agent is not sprayed carelessly at the time of inspection of the engine or the like, which is convenient for inspection of the engine or the like.

Furthermore, according to the invention according to claim (4), the configuration of the setting means in the invention according to claim (3) is the same as that of the invention according to claim (2). In addition to performing the same operation of the invention, the setting signal once set by the operator is surely maintained as long as it is not set again, and during the spraying operation, the opening and closing metering valve is set to the opening degree that the operator does not intend. There is no risk of shifting.

〔Example〕

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
In the following description, an example will be described in which the power spreader a shown in FIGS. 9 to 11 is provided with the spray amount adjusting device of the present invention instead of the conventional spray amount adjusting device b. It is.

 First, an embodiment serving as a basis of the present invention will be described.

First, a spray amount adjusting device c according to an embodiment which is a basis of the present invention.
FIG. 2 is an electric circuit diagram showing a specific example thereof, and FIG. 3 is a power spreader a showing a state equipped with a spray amount adjusting device c according to an embodiment of the present invention.
Is an enlarged view of a portion corresponding to FIG.

In these drawings, reference numeral 1 denotes an openable and closable control valve provided in a supply passage 14 of the power spreader a, and in the case of the drawing embodiment, the open and close control valve shown in FIGS. 10 and 12 is used. 1 are exactly the same as those of FIG. 1 and are denoted by the same reference numerals, and detailed description thereof is omitted. In any case, the opening / closing control valve 1 only needs to be able to open and close the supply passage 14, and may have another configuration.

Reference numeral 25 denotes an actuator for opening and closing the on-off control valve 1, and reference numeral 26 denotes an on-off detecting means for outputting a detection signal corresponding to the opening degree of the on-off control valve 1.

In the case of the embodiment shown in the drawing, a forward / reverse rotatable DC motor 27 is used as the actuator 25, and an open / close detecting means is provided.
A sliding type variable resistor (potentiometer) 28 is used as 26, and these are provided in the power spreader a as shown in FIG. That is, the DC motor 27 and the variable resistor 28 are provided on a mounting portion 29 provided on the upper part of the fan case 5. Also, in FIG.
Numeral 30 is a gear attached to the output shaft of the motor 27, 31 is a reduction gear meshing with the gear 30, 32 is a rotatable shaft provided with a suitable pitch male screw on the peripheral surface, and 32 is a rotatable shaft. The reduction gear 31 is fixed. 33 is the shaft 32
The boss 34 is a plate piece rotatable about a center point A. Between the two, the plate piece 34 is centered when the boss 33 moves left and right in FIG. It is connected so as to rotate around the point A. Further, although not shown in the drawing, the twelfth
An axis corresponding to the axis 22 in the figure is provided so that its center coincides with the center point A, and an end of the axis is fixed to the plate piece 34. Still further, the sliding variable resistor
The sliding portion 28a of the 28 and the boss 33 are connected by a link rod 35.

Accordingly, when the DC motor 27 is rotated forward and backward, the shaft 32 rotates, the boss 33 moves left and right, and the plate piece 34 rotates around the center point A, which corresponds to the shaft 22. The shaft rotates, whereby the sliding plate 20 of the on-off metering valve 1 slides, and the opening thereof is adjusted. Further, the sliding type variable resistor 28 is connected via a link rod 35 by the left and right movement of the boss 33.
The sliding portion 28a is slid, and its resistance value changes in accordance with the opening of the on-off metering valve 1. That is, the potential at the point E in FIG. 2 becomes a detection signal of the opening degree detecting means 26. Note that the potential at point E is equal to the open / close control valve 1
The larger the opening of the vehicle, the higher it becomes.

Further, the DC motor 27, the variable resistor 28, the shaft 32,
34 and the like are covered with a cover (not shown).

Further, the actuator 25 is not limited to the DC motor 27, but may use other various actuators. As the opening degree detecting means 26, various detecting means such as a rotary variable resistor and a potentiometer can be used.

Next, a target signal corresponding to a target opening degree of the opening / closing control valve 1 and a detection signal of the opening / closing detection means 26 are inputted, and based on these, the opening degree of the opening / closing control valve 1 is set to a target. The driving circuit drives the actuator 25 so that the opening degree becomes as follows.

In the case of the embodiment shown in the drawing, the driving circuit 36 includes resistors 37... 47 and an operational amplifier constituting an operational amplifier as shown in FIG.
48, NPN transistor 49, 50, 51, PNP transistor 5
60, a power switch 61, and a DC power supply 62 are connected as shown in the figure.

According to this drive circuit 36, the potential at point G in FIG.
This is a potential corresponding to the difference between the potential of the point and the potential of the point F1. The potential at the point E is determined by the opening degree detecting means 26 as described above.
, And the potential at point F1 is the target signal.

When the potential at the point G becomes 1.3 V, for example, the transistors 49 and 54 are both turned off. When the potential becomes higher than 1.3 V, the transistor 49 is turned on and the transistor 54 is turned off. When the potential becomes smaller than 1.3 V, the transistor 49 and 54 are turned off. Each circuit constant is determined so that 49 is turned off and transistor 54 is turned on. Therefore, G
When the potential of the point reaches 1.3 V, the transistors 52 and 53 are turned off, the transistors 50 and 51 are also turned off and the DC motor 27 is stopped, and when the potential of the point G becomes higher than 1.3 V, the transistors 51 and 52 are turned on. , The transistors 50 and 53 are turned off, and the DC motor 27 rotates forward (rotation to close the on-off control valve 1), and G
When the potential of the point becomes smaller than 1.3V, the transistor
DC motor with 50,53 on and transistors 51,52 off
Reference numeral 27 denotes reverse rotation (rotation for opening and closing the opening / closing control valve 1).

Therefore, according to the drive circuit 36 shown in FIG. 2, when the actual opening of the opening / closing control valve 1 is larger than the target opening, the potential at the point G becomes larger than 1.3 V, and the DC motor 27 rotates forward and the open / close metering valve 1 is closed, and the potential at point G decreases. When the potential at the point G reaches 1.3 V, that is, when the actual opening of the on-off control valve 1 reaches the target opening, the potential at the point G becomes 1.3 V and the DC motor 27 Stops and its opening is maintained. If the actual opening degree of the opening / closing control valve 1 is smaller than the target opening degree, the operation described above is performed in reverse, and the opening degree of the opening / closing control valve 1 is actually set to the target opening degree. It is kept in a well-defined state.

The configuration of the drive circuit 36 is not limited to the configuration shown in FIG.

Reference numeral 63 denotes a setting means which can set the opening degree of the opening / closing control valve 1 desired by the operator and outputs a setting signal corresponding to the set opening degree. Note that a potentiometer 64 is used as the setting means 63, and although not shown in the drawing, the potentiometer 64, together with the drive circuit 36, is located at an optimal position in front of an operator, for example, at the injection tube 15. It is arranged in the provided operation box or the like. The potentiometer is used to set the opening degree of the opening / closing control valve 1 desired by the operator.
When operating the 64, the resistance value of the potentiometer 64 is changed accordingly, in FIG. 2, in which the potential of the F ₁ point is changed. That is, in the drawings examples which potential of F ₁ point is the set signal. The potential of F ₁ point is summer so high as to try to set large the opening of the opening and closing control valve 1.

Note that the setting means 63 is not limited to the potentiometer 64, and it is a matter of course that other means such as a sliding or rotary variable resistor may be used.

And, in the embodiment on which the present invention is based,
The setting signal of the setting means 63 is input to the drive circuit 36 as the target signal.

According to the embodiment underlying the present invention of the structure, as described above, Yotsute actuator 25 barrels DC motor 27 is controlled to the driving circuit 36, the target value signal input to the drive circuit 1 (the F ₁ point The opening of the on-off metering valve 1 is made to coincide with the target opening determined by the electric potential). Then, the setting signal of the target value signal (F ₁ point potential) as a setting unit 63 is inputted to the driving circuit becomes a opening degree of the opening and closing control valve 1 is set by the setting means 63 The operator can arbitrarily set the opening / closing control valve 1 by operating the setting means 63, and can freely adjust the amount of the agent 3 to be sprayed.

In the embodiment which is the basis of the present invention, there is no equivalent to the link mechanism such as the rod 18 in the conventional spray amount adjusting device b, and the opening and closing adjustment valve 1 is controlled by the drive circuit 36 and the actuator 25. Since they can be opened and closed, they can be covered with a cover or the like, so that they do not protrude from the main body 9, and there is no danger that the spraying amount cannot be adjusted due to rust and the like as in the related art. Further, the setting means 63 is different from the spray amount adjusting lever 17 connected to the link mechanism in the conventional spray amount adjusting device b, and outputs an electric setting signal. However, as described above, it can be provided at the position in front of the worker, for example, at the injection pipe 15, so that the operability can be improved and the worker can set the setting means.
Since the setting state of 63 can be visually checked, the desired degree of opening of the opening / closing control valve 1 can be reliably set.

A stopper such as a screw is provided on the operation lever at a position desired by the operator so that the operator can arbitrarily determine the movable range of the operation lever or knob of the potentiometer 4 as the setting means 63. The opening and closing metering valve 1
This is convenient when setting the opening of the camera. That is, for example, by previously setting the stopper at a position corresponding to the opening of the opening / closing control valve 1 that is frequently used by an operator, the operator can quickly operate the operation lever or the like until it is limited by the stopper. The opening of the on-off metering valve 1 can always be set to the same value, which is convenient.

FIG. 4 shows a main part of still another embodiment of the present invention, which corresponds to FIG. 12, and the same components as those of the above embodiment are denoted by the same reference numerals. The description is omitted.

In the case of this embodiment, a boss 65 fixed to the slide plate 20 of the on-off metering valve 1 has a suitable pitch on the outer periphery connected via a coupler 67 to the output shaft of a stepping motor 66 as the actuator 25. It is screwed to a shaft 68 having an external thread. Therefore, when the stepping motor 66 is rotated, the shaft 68 is rotated, whereby the boss 65 is moved left and right, and the opening and closing control valve 1 is opened and closed. In the embodiment shown in FIG. 4, an encoder 69 for detecting the number of revolutions (rotation angle) of the stepping motor 66 is used as the opening degree detecting means 26.
That is, in this case, the relative movement amount of the slide plate 20 is directly detected by the encoder 69, but the output signal of the encoder 69 is output in the rotation direction of the stepping motor 66. By processing the signal with a corresponding arithmetic processing circuit (not shown) together with a corresponding signal, a signal corresponding to which direction and how much the sliding plate 20 has moved with respect to a predetermined reference position, ie, opening and closing, An open / close detection signal corresponding to the opening of the metering valve 1 is obtained.

In the case of this embodiment, the drive circuit 36 shown in FIG. 2 cannot be used as it is and must be modified. However, since the modification is obvious from the viewpoint of circuit technology, a description thereof will be omitted. . Except for the points described above, the configuration is the same as that of the above-described embodiment.

 Next, the invention according to claim (1) will be described.

FIG. 5 shows a spray amount adjusting device d according to the invention of claim (1).
FIG. 6 is a block diagram showing a schematic configuration of the present invention, and FIG. 6 is an electric circuit diagram showing a specific example thereof, and has the same configuration as that of FIG. 1 to FIG. The same reference numerals are given to the portions, and the description thereof will be omitted.

The difference between the spray amount adjusting device d and the spray amount adjusting device c is that the setting signal of the setting means 63 is not directly input to the drive circuit 36 as the target signal, and the open / close metering valve 1 is fully closed. Closing command means 70 that outputs a fully closing signal according to
Operating state detecting means 71 for detecting the operating state of the blower fan 4; receiving a signal from the operating state detecting means 71, when the blower fan 4 is not in a predetermined operating state, The first switching means 72 is provided for inputting a fully-closed signal to the drive circuit 36 with the setting signal of the setting means 63 as the target signal when the blower fan 4 is in a predetermined operating state.

In the case of the embodiment shown in FIG.
3, 74 are used and connected as shown in FIG. That is, the potential at point F _{3 in} FIG. 6 is a fully closed signal,
Potential of such F ₃ points, opening the metering valve by the operation of the drive circuit 36 and the actuator 27 when the potential of the switched by F ₁ point has decreased to the same potential of the _three points F by contact 75c to be described later 1 Is set to the level at which it becomes a fully closed state.

A microswitch 75 interlocking with the throttle operating lever 24 of the power spreader a is used as the operating state detecting means 71 and the first switching means 72, and its contacts 75a, 75b, 75c are used. They are connected as shown in FIG. Then, the throttle operation lever 24 is moved to a predetermined rotational speed such as when the engine 6 is idling, for example,
When operated at 4000rpm or less, the contact 7
5a is open, the contact 75b is short-circuited, the xy at the contact 75c is short-circuited, and the xz is open, and conversely, the throttle lever 24 is operated so that the engine 6 has a predetermined rotation speed, for example, 4000 rpm or more. The contact 75a is short-circuited and the contact 7
5b is open and the contact 75c is open between xy and short between xz. In the power sprayer a, the engine 6 and the blower fan 4 are directly connected.

Accordingly, the microswitch 75 indirectly detects the rotational speed of the engine 6, that is, the operating state of the blow fan 4, and when the blow fan 4 is not in the predetermined operating state, the micro switch 75 of the fully closed command means 70 The fully closed signal is input to the drive circuit 36 as the target signal. That is, when the blower fan 4 is not in the predetermined operating state, and thus to the F ₃ points in FIG. 6 by switching the contact 75c to the same potential. When the blower fan 4 is in a predetermined operating state, the setting signal of the setting means 63 is input to the drive circuit 36 as the target signal. That is,
When the blow fan 4 is in a predetermined operating state, the contact 75
and F ₂ points and F ₁ point in FIG. 6 are switched by c and thus to the same potential.

The contacts 75a and 75b are provided to reduce power consumption, and needless to say, they may be removed and their locations may be short-circuited.

The microswitch 75 serves as both the operating state detecting means 71 and the first switching means 72 as described above, but may of course be configured separately. That is, for example, a relay is used as the first switching means 72, and its contacts replace the contacts 75a, 75b, 75c shown in FIG. 6 and the operating state detecting means 71 directly detects the rotational speed of the engine 6. A configuration may be employed in which a detection circuit is used and the relay is operated by the output signal.

According to the first aspect of the present invention, when the blower fan 4 is in a predetermined operating state, that is, during the spraying operation, the setting signal of the setting means 63 is input to the drive circuit 36 as the target signal. Therefore, similarly to the embodiment on which the present invention is based, the opening of the opening / closing control valve 1 becomes the opening set by the setting means 63, and the operator operates the setting means 63 to adjust the opening / closing. The degree of opening of the quantity valve 1 can be set arbitrarily, and the amount of the applied agent 3 can be freely adjusted. When the blower fan 4 is not in the predetermined operating state, that is, at the end of the spraying operation, the fully-closed signal of the fully-closed command means 70 is used as the target signal as the drive circuit 36.
, The open / close metering valve 1 is automatically fully closed.

Therefore, according to the invention according to claim (1), there is no possibility that the spray amount cannot be adjusted due to rust or the like as in the embodiment of the present invention, and the operability is improved. In addition to the above, it is impossible to forget to fully close the on-off metering valve 1 at the end of the spraying operation, and there is no possibility that the sprayed agent 3 in the storage tank 2 will unnecessarily spill into the spray pipe 15 or the like. It is.

By the way, in the embodiment shown in FIG. 2 or FIG. 6, only the potentiometer 64 is used as the setting means 63, so that the operator may make an error depending on the type of the knob or the operation lever. In response to vibration or the like generated during the spraying operation, the resistance value of the potentiometer 64 may be shifted and an erroneous setting signal may be output. May be shifted to an opening degree not intended by the operator. Therefore, in order to eliminate such inconveniences, in the invention according to claim (2), the setting means 63 is changed according to the opening degree of the storage means and the opening / closing control valve desired by the operator in the storage means. And a data setting means capable of storing data, wherein a signal corresponding to the data stored in the storage means is output as a setting signal. The specific configuration of such a setting means is the same as that of the setting means 63 in the embodiment of FIG. 8 described later, and a description thereof will be omitted.

Next, FIG. 7 is a block diagram showing a schematic configuration of a spray amount adjusting device e of the invention according to claim (3), and FIG. 8 is an electric circuit diagram showing a specific example thereof. The same components as those in FIGS. 5 and 6 showing the spray amount adjusting device d according to the present invention are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 7, this spray amount adjusting device e is different from the spray amount adjusting device d in that a fully closed release signal for releasing the fully closed state of the open / close metering valve 1 by an operator's operation. Is added, and a second switching means 81 is provided instead of the first switching means 72. The second switching means 81 receives the signals from the operating state detecting means 71 and the canceling operating means 80, and always outputs the fully closing command means 70 when the blowing fan 4 is not in the predetermined operating state. When the blow fan 40 is in a predetermined operation state, the setting signal of the setting unit 63 is received when the full closing release signal is received, and the full closing command unit 70 is output when the full closing release signal is not received. Are input to the drive circuit 36 as the target signals.

In the case of the embodiment shown in FIG. 8, the microcomputer 82 is used, and all or a part of the functions of the above-mentioned components are assigned to the microcomputer 82. The points different from the embodiment in FIG. The microcomputer 82 includes a CPU, a memory, and a normal output port, and further includes an A / D converter.The A / D converter includes an input port and a normal input port. .

A variable resistor 28 is used for the opening degree detecting means 26 shown in FIG. 8 as in FIG. 6, but an output voltage as a detection signal is connected to an input port of the A / D converter of the micro computer 82. I have. This is because the microcomputer 83 has a part of the function as the drive circuit 36, that is, a function corresponding to the operational amplifier 48 in FIG. 6, as described later.

The setting means 63 shown in FIG. 8 includes storage means, and data setting means capable of storing data corresponding to the opening degree of the opening / closing control valve 1 desired by an operator in the storage means. It is configured to output a signal corresponding to the data stored in the means as a setting signal. That is, the memory in the micro computer 82 is used as the storage means, and the data setting means is used when the operator tries to store the variable resistor 83, the resistors 84, 85 and the operator to store data. The variable resistor 83 comprises a setting switch 86 for operating the output voltage of the variable resistor 83.
While connected to the input port of the A / D converter of 82, the connection midpoint between the switch 86 and the resistor 85 is connected to the normal input port of the micro computer 82,
The variable resistance only when the switch 86 is operated
Data determined by the output voltage of 83
The stored data is handled as a setting signal in the microcomputer 82 as described later. Therefore, when the setting means 63 is configured in this way, the operator can adjust the variable resistance 83.
Adjustment, press the setting switch 86 to store the data once, and then press the variable resistor 83 unless the setting switch 86 is pressed again.
The data set by the worker is securely retained even if the resistance value of the sensor is misaligned for some reason, and a setting signal according to the opening set by the worker is always output. There is no possibility that the opening / closing control valve 1 is shifted to an opening degree not intended by the operator.

When the setting means 63 is configured in this way, it corresponds to the invention according to claim (4). However, in the invention according to claim (3), the setting means 63 is not necessarily configured as such. There is no necessity. For example, the setting switch 86 and the resistor 85 shown in FIG. 8 may be removed to make the setting unit 63 the same as that of the setting unit 63 shown in FIG. 6, and the output voltage of the variable resistor 83 may be always taken into the micro computer 82. It is.

The operating state detecting means 71 shown in FIG. 8 comprises a contact 87 of a microswitch and a resistor 88 which operate in the same manner as the microswitch 75 shown in FIG. Connected to the input port of

Further, in the case of the embodiment of FIG. 8, the release operation means 80 comprises a release switch 89 and a resistor 90 which are operated when the operator attempts to release the fully closed state of the open / close metering valve 1, and The connection midpoint is connected to a normal input port of the microcomputer 82.

The micro computer 82 also has a function as the fully closed command unit 70. That is, data corresponding to the fully closed signal is stored in a predetermined address of the memory of the microcomputer 70 in advance.

Further, the micro computer 82 also has a function as the second switching means 81. That is, the microcomputer 82 determines the state of the contact 87 of the microswitch and the state of the setting switch 89, and selects data corresponding to the setting signal or data corresponding to the fully closed signal according to the state. In other words, microcomputer 82
Accordingly, when the blower fan 4 is not in the predetermined operation state, data corresponding to the fully closed signal is always selected, and when the blower fan 4 is in the predetermined operation state, the release switch 89 is operated. Data corresponding to the setting signal is selected, and when the release switch 89 is not operated, data corresponding to the fully closed signal is selected.

Further, the microcomputer 82 also has a part of the function as the drive circuit 36, that is, a function corresponding to the operational amplifier 48 shown in FIG. That is, the microcomputer 82 compares the data corresponding to the fully-closed signal or the data corresponding to the setting signal selected as described above with the detection signal of the opening degree detecting means 26, and when they do not match, they match. Thus, a predetermined signal is output from the output port to drive the motor 27, and a predetermined voltage is applied to point G in FIG. 8 through the D / A converter 91 and the resistor 43 in the same manner as in the embodiment of FIG. is there.

Each function of the micro computer 82 is realized by software, but since such a technology is obvious, the description thereof is omitted.

According to the spray amount adjusting device e of the invention according to claim (3) having the above configuration, basically the same operation as the spray amount adjusting device d of the invention according to claim (1) is performed. Since the release operation means 80 is added and the second switching means 81 is provided instead of the first switching means 72,
This is convenient for checking the engine 6 and the like for operating the blower fan 4. That is, in the spray amount adjusting device d, when the rotation speed of the engine 6 or the like is increased by the operation of the first switching means 72 to bring the blower fan 4 into a predetermined operation state, the opening / closing adjustment valve 1 is automatically turned on. Becomes the opening determined by the setting signal. Therefore, when the rotation speed is increased for inspection of the engine 6 and the like, the opening of the on-off metering valve 1 is fully closed by the setting means 63 in advance. If the setting is forgotten, the opening / closing control valve 1 is opened carelessly and the sprayed agent is sprayed, which is inconvenient for checking the engine 6 and the like. On the other hand, according to the spray amount adjusting device e of the invention according to claim (3), the rotation speed of the engine 6 and the like is increased by the action of the release operation means 80 and the second switching means 81, and the blow fan 4 The opening and closing metering valve 1 is fully closed unless the operator operates the release operation means 80 regardless of the setting state by the setting means 63 even when the predetermined operation state is set. This is convenient for checking the engine 6 and the like without spraying the spraying agent.

〔The invention's effect〕

According to the invention of claim (1), there is no danger that the spraying amount cannot be adjusted due to rust or the like as in the related art, and the operability can be improved, and the operator can use the setting means. The effect of being able to set the opening degree of the opening / closing control valve 1 desired by himself can be obtained because the user can silently check, and the opening / closing control valve is automatically fully closed at the end of the spraying operation. The effect that there is no possibility of forgetting to fully close the quantity valve and that there is no possibility that the spraying agent is unnecessarily spilled to the jet pipe or the like is obtained.

According to the invention according to claim (2), in addition to obtaining the same effect as in claim (1), the setting signal once set by the operator is securely held as it is unless reset again. An effect is obtained in which there is no possibility that the opening / closing control valve shifts to an unintended opening degree during the spraying operation.

According to the invention according to claim (3), in addition to the same effect as in claim (1), an effect that is convenient for inspection of an engine or the like for operating the blower fan can be obtained. .

According to the invention of claim (4), in addition to obtaining the same effect as in claim (3), there is no possibility that the opening / closing control valve shifts to an unintended opening degree by the operator during the spraying operation. An effect can be obtained.

[Brief description of the drawings]

1 shows an embodiment of the present invention. FIG. 1 is a block diagram showing a schematic configuration of a spray amount adjusting device according to an embodiment of the present invention, and FIG. 2 is an electric circuit diagram showing a specific example thereof. FIG. 3 is a partially enlarged view of a power spreader equipped with a spray amount adjusting device according to an embodiment of the present invention, FIG. 4 is a cross-sectional view showing a main part of the embodiment as the base of the present invention, FIG. 5 is a block diagram showing a schematic configuration of the spray amount adjusting device of the invention according to claim (1), FIG. 6 is an electric circuit diagram showing a specific example thereof, and FIG.
FIG. 10 is a block diagram showing a schematic configuration of a spray amount adjusting device according to the invention (3), FIG. 8 is an electric circuit diagram showing a specific example thereof, FIG. 9 is a front view of a power sprayer, and FIG. FIG. 11 is a longitudinal sectional view, FIG. 11 is a rear view thereof, and FIG. 12 is a longitudinal sectional view showing an on-off control valve. DESCRIPTION OF SYMBOLS 1 ... Open / close metering valve, 2 ... Storage tank, 3 ... Spraying agent, 4 ... Blow fan, 14 ... Supply passage, 25 ... Actuator, 26 ... Open / close detection means, 36 ... Drive circuit , 63 ...
... Setting means, 70... Fully closing command means, 71... Operating state detecting means, 72... First switching means, 80.
... second switching means, a ... power sprayer, c, d, e ... spray amount adjustment device.

Claims (4)

(57) [Claims] 1. A power spraying machine for spraying an agent to be sprayed stored in a storage tank by an airflow from a blower fan through a supply passage, wherein the opening and closing control valve is provided in the supply passage and can be freely opened and closed. An actuator for opening and closing the control valve; an opening detecting means for outputting a detection signal corresponding to the opening of the control valve; a target signal and the opening corresponding to a target opening of the control valve; A drive circuit for driving the actuator so that the detection signal of the detection means is input and the opening of the opening / closing control valve is set to the target opening based on the input signal; Setting means for setting an opening degree and outputting a setting signal corresponding to the set opening degree; fully closing command means for outputting a fully closing signal corresponding to a fully closed state of the open / close metering valve; Operating status to detect operating status Receiving the signal from the operating means and the operating state detecting means, setting the fully closing command means and the fully closing signal when the blowing fan is not in a predetermined operating state, and setting the fully closing signal when the blowing fan is in a predetermined operating state. And a first switching unit for inputting a setting signal of the unit as the target signal to the drive circuit. 2. The setting means comprises a storage means, and a data setting means capable of storing data corresponding to an opening degree of an opening / closing control valve desired by an operator in the storage means, wherein the data is stored in the storage means. The apparatus according to claim 1, wherein the apparatus is configured to output a signal corresponding to the obtained data as a setting signal. 3. A power spraying machine for spraying an agent to be sprayed stored in a storage tank through a supply passage by an airflow from a blower fan, wherein said open / close control valve is provided in said supply passage and said opening / closing control valve is provided. An actuator for opening and closing the control valve; an opening detecting means for outputting a detection signal corresponding to the opening of the control valve; a target signal and the opening corresponding to a target opening of the control valve; A drive circuit for driving the actuator so that the detection signal of the detection means is input and the opening of the opening / closing control valve is set to the target opening based on the input signal; Setting means for setting an opening degree and outputting a setting signal corresponding to the set opening degree; fully closing command means for outputting a fully closing signal corresponding to a fully closed state of the open / close metering valve; Operating status to detect operating status Output means, a release operation means for outputting a fully closed release signal for releasing a fully closed state of the open / close metering valve by an operation of an operator, and receiving signals of the operation state detection means and the release operation means, When the blower fan is not in the predetermined operating state, the full closing signal of the fully closing command means is always set. When the blower fan is in the predetermined operating state, the setting of the setting means is set when the full closing release signal is received. And a second switching means for inputting the fully-closed signal of the fully-closed command means to the drive circuit as the target signal when not receiving the fully-closed release signal. Spray volume adjustment device. 4. The setting means comprises a storage means, and a data setting means capable of storing data in the storage means in accordance with an opening degree of the opening / closing control valve desired by an operator, and storing the data in the storage means. The apparatus according to claim 3, wherein the apparatus is configured to output a signal corresponding to the obtained data as a setting signal.