JP2003305388A - Power sprinkler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power sprinkler constituted so as to be capable of certainly preventing erroneous operation by uniting the on/off operation of the throttle valve of an internal combustion engine and the on/off operation of a shutter. <P>SOLUTION: This power sprinkler is equipped with a chemical agent tank (4) for storing a powdery or particulate chemical agent, a blower (3) for feeding the chemical agent in the chemical agent tank (4) to the outside and the internal combustion engine (5) for rotationally driving the blower (3). An amount regulator (10) having sprinkling amount regulating shutters (11 and 11) is interposed between the chemical agent tank (4) and the blower (3) and a linking operation means (20) for performing the on/off operation of the throttle valve (7) of the internal combustion engine (5) and the on/off operation of the shutters (11 and 11) in a cooperative manner is arranged. The linking operation means (20) performs operation allowing the shutters (11 and 11) to begin to open after the throttle valve (7) is opened to a predetermined opening degree or more and permitting the throttle valve (7) to begin to close from a state of opening in a predetermined opening degree or more after the shutters (11 and 11) are closed from an opened state. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drug tank for storing a drug such as powder or granular material, a blower for transferring the drug in the drug tank to the outside, and an internal combustion engine for rotationally driving the blower. And a power spreader blower in which a metering device having a spraying amount adjusting shutter is interposed between the medicine tank and the blower, and particularly, the opening and closing operation of the shutter and the internal combustion engine The present invention relates to a system in which the opening / closing operation of the throttle valve is unified to prevent erroneous operation.

[0002]

2. Description of the Related Art For example, in a backpack type power spreader,
As seen in Japanese Unexamined Patent Publication No. 9-206639, Japanese Utility Model Publication No. 4-923, and the like, a drug that stores a drug such as a granular material above (a volute case of) a centrifugal fan that is rotationally driven by an internal combustion engine. A tank is provided, and a metering device is interposed between the outlet of the medicine tank and the blower, and the volume of the medicine in the medicine tank is adjusted by the metering device while the flow rate is adjusted. While being sucked into the case, riding on the air that flows through the case, a curved pipe or a bellows-shaped flexible pipe is formed from a jet port that projects obliquely downward on one side (generally the right side) of the case. It is designed so that it can be ejected to the outside through a spray pipe portion such as a direct injection pipe.

A metering device used in such a power sprayer is usually provided with a spraying amount adjusting shutter made of a metal plate or the like that opens and closes a passage part through which a drug is made to flow, and adjusts the spraying amount of the drug. This is done by operating a metering lever of a manual operation device provided on one side of the machine body or the like to rotate the shutter to change its opening.

In addition, the manual operation device is often provided with a throttle lever for adjusting the opening degree of the throttle valve of the internal combustion engine, in addition to the adjustment lever.

[0005]

By the way, in the power spreader as described above, unless the rotation speed of the internal combustion engine is sufficiently increased, the ability of the blower to carry the medicine is insufficient. At this time, when the shutter is opened wide by operating the metering lever, the medicines flow down into the volute case all at once, and the medicines do not stay in the spray pipe portion and the like and are not ejected to the outside. It causes troubles such as clogging.

[0006] Therefore, conventionally, an operator adjusts the timing of opening the shutter and the opening thereof by instinctively relying on, for example, air ejection force and engine sound. Therefore, the timing to open the shutter is too early,
Misoperation such as the opening of the shutter being too large was likely to occur.

Further, in the prior art, the metering lever and the throttle lever are manually operated separately to open and close the shutter and the throttle valve. There is also a problem that an erroneous operation such as an operation of confusing and may occur.

The present invention has been made in view of the above problems, and an object thereof is to unify the opening / closing operation of a throttle valve of an internal combustion engine and the opening / closing operation of the shutter to ensure erroneous operation. It is to provide a power spreader that can be prevented.

[0009]

In order to achieve the above-mentioned object, a power spraying machine according to the present invention basically comprises a drug tank for storing a drug such as powder and granules, and a drug in the drug tank. And a blower for conveying the blower to the outside, and an internal combustion engine for rotationally driving the blower, and a metering device having a spray amount adjusting shutter is interposed between the medicine tank and the blower. It becomes.

[0010] Further, it is characterized in that there is provided a cooperative operation means for coordinating the opening / closing operation of the throttle valve of the internal combustion engine and the opening / closing operation of the shutter.

Preferably, the cooperative operation means starts opening the shutter after the throttle valve is opened to a predetermined opening or more, and sets the throttle valve to the predetermined value after the shutter is closed. An operation to start closing from the state in which the opening is larger than the opening is performed.

Further, in a concrete preferred mode, the cooperation operating means controls a shutter opening / closing cam and a throttle valve opening / closing cam which are integrally rotated on a common rotation axis, and rotation of those cams. A follower member for converting the shutter and the throttle valve into an opening / closing operation.

In this case, preferably, while the shutter opening / closing cam and the throttle valve opening / closing cam are rotated from an initial rotation position which is a start point portion to an intermediate rotation position which is an intermediate point portion, the shutter is opened. While the throttle valve is closed, the throttle valve is gradually opened from the closed idle rotation opening degree to the maximum opening degree, and is rotated from the intermediate point portion to the final rotation position which is the end point portion. The shapes of the shutter opening / closing cam and the throttle valve opening / closing cam are set so that the opening of the shutter is gradually increased, but the throttle valve is held at the maximum opening.

The linking operation means preferably includes a single motor for integrally rotating the shutter opening / closing cam and the throttle valve opening / closing cam in both forward and reverse directions.

In another preferred aspect, the cooperative operation means includes a control mechanism for controlling the start / stop and the rotation direction of the motor.

[0016] Preferably, the control mechanism is capable of selectively taking three positions: a normal position for rotating the motor in the normal direction, a neutral position for stopping the motor, and a reverse position for rotating the motor in the reverse direction. A switch, a manual operation member for causing the momentary switch to take one of the three positions, the shutter opening / closing cam and the throttle valve opening / closing cam rotate to the initial rotation position and the final rotation position. And a limit switch for stopping the rotation of the motor when it is pressed.

In a preferred embodiment of the power spraying machine according to the present invention having such a structure, when starting the chemical spraying work, the manual operation member is operated to set the forward rotation position to the momentary switch. And maintain this position. As a result, the motor starts to rotate normally,
The shutter opening / closing cam and the throttle valve opening / closing cam start to rotate rightward (forward rotation), for example, from the initial rotation position. In this case, while the both cams are rotated from the initial rotation position to the intermediate rotation position,
The shutter remains closed due to the action of the shutter opening / closing cam and the follower member, but the throttle valve is operated by the action of the throttle valve opening / closing cam and the follower member. The valve is gradually opened from (closed) to the maximum opening (fully opened). As a result, the rotation speed of the internal combustion engine rises to reach the rotation speed (for example, 6000 rpm) at which the blower can obtain a sufficient drug carrying capacity.

On the other hand, while the shutter opening / closing cam and the throttle valve opening / closing cam are rotated from the intermediate rotating position to the final rotating position, the shutter opening / closing cam and the follower member act. As a result, the opening of the shutter is gradually increased, but the throttle valve is maintained at the maximum opening by the action of the cam for opening and closing the throttle valve and the follower member.

Therefore, while the shutter opening / closing cam and the throttle valve opening / closing cam are rotated from the intermediate rotation position to the final rotation position, the blower has a sufficient medicine transport capability. Since the shutter is opened by the above, the medicine will flow down into the volute case of the blower all at once without the sufficient medicine conveying ability as in the conventional case, and will stay in the spray pipe section etc. Therefore, it is possible to reliably prevent such a problem that the spray pipe portion is not clogged and is clogged.

Further, since the cooperation operation means is provided with a control mechanism having a single motor, a manual operation member, etc., the opening / closing operation of the throttle valve and the opening / closing operation of the shutter are unified and coordinated. It is possible to reliably prevent erroneous operations such as opening the shutter too early, opening the shutter too large, and mistakenly opening and closing the shutter and opening and closing the throttle valve.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. 1 and 2 are a schematic front view and a left side view showing an embodiment of a backpack type power spreader according to the present invention, respectively.

The backpack type power spreader 1 of the illustrated embodiment is mounted and held in a posture in which a centrifugal blower 3 having a volute case 3a stands on a backpack rack 2 having an L-shape in side view, which is carried by an operator with a backpack band (not shown). At the same time, a small air-cooled two-cycle internal combustion engine 5 having a carburetor 6 with a built-in throttle valve 7 for rotationally driving the blower 3 is mounted and held. Above the volute case 3a is provided a drug tank 4 for storing a drug as a spray made of powder and granules, and between the drug tank 4 and the volute case 3a, as shown in FIGS. As shown in FIG. 5, the metering device 10 having the passage portions 13, 13 connected to the funnel-shaped outlet 4a of the medicine tank 4 is interposed. This metering device 10 has a rectangular plate-shaped dispersion amount adjusting shutter 11 in which the passage portions 13 and 13 are of a double type.
It is designed to open and close at 11. The shutter 11,
Discs 14 and 14 are externally fitted and fixed to the outer ends of the support shafts 11a and 11a of the support shaft 11a on the backpack mount 2 side, and the pair of shutters 11 and 1 are provided between the discs 14 and 14.
An interlocking link 15 for synchronizing and rotating 1 is bridged.

Under the above structure, the medicine tank 4 is
The medicine inside is sucked into the volute case 3a while the amount of the medicine flowing down is adjusted according to the opening degree (rotation angle) of the shutters 11 and the air flowing through the medicine is put on the right side of the machine body. From a jet port 3b (FIG. 1) projecting obliquely downward in the portion, through a spray pipe portion 55 including a bent pipe 56, a bellows-like flexible pipe 57, a direct injection pipe (not shown), and the like. , It is designed so that it can be ejected to the outside.

In the power spreader 1 of the present embodiment, there is provided a cooperative operating device 20 which cooperates with the opening / closing operation of the throttle valve 7 of the internal combustion engine 5 and the opening / closing operation of the shutters 11, 11. ing.

The main part of the cooperative operating device 20 is arranged in a case 21 assembled between the upper part of the backpack frame 2 and the volute case 3a, and a common rotary axis O (rotational axis O). The shutter opening / closing cam 30 and the throttle valve opening / closing cam 40 that are integrally rotated on the moving shaft 22), and the rotation of the two cams 30, 40 are the shutters 11, 11 and the throttle valve 7.
A linear shutter opening / closing lever 35 and a "dogleg" -shaped throttle valve opening / closing lever 45 are provided as follower members for converting into the opening / closing operation.

The shutter opening / closing cam 30 and the throttle valve opening / closing cam 40 are externally fitted and fixed to the rotary shaft 22, and the two cams 30, 40 and the rotary shaft 22 are a worm wheel or the like. A single motor 25 is integrally rotated in both forward and reverse directions via a reduction gear mechanism 27 consisting of.

The shutter opening / closing cam 30 is a positive-moving cam composed of a bossed disc externally fitted and fixed to the rotary shaft 22 on the side of the volute case 3a.
As well understood by referring to FIG. 6, FIG. 7, and FIG. 8 in addition to FIG. 3 to FIG. 5, the groove carved in the disc with the boss is the cam surface (cam groove) 30a.

In the cam groove 30a, the intermediate portion is the support shaft 33.
A roller 36 provided at the cam side end (lower end) of the shutter opening / closing lever 35 rotatably supported in the case 21 is slidably fitted therein. An upper opening groove 37 having a predetermined depth is formed on the end portion (upper end portion) of the lever 35 on the side opposite to the cam, and the upper opening groove 37 is located on the right side when viewed from the backpack mount 2 side. A pin 16 with a roller protruding from the disk 14 attached to the support shaft 11a of the shutter 11 is sandwiched.

As can be seen from the initial rotation position Ps of FIG. 6, the cam groove 30a has a starting point portion Ss (where the roller 36 of the lever 35 abuts when the shutter 11 is closed). It is formed with the same width from the side close to the central axis O) to the end point portion Es (see the final rotation position Pe in FIG. 8) which comes into contact when the shutter 11 is fully opened, and the start point portion Ss. To midpoint M
up to s (see the intermediate rotation position Pm in FIG. 7) (rotation angle α)
Are circular arcs having the same radius (inner radius Rs), and the intermediate point M
From s to the end point Es (rotation angle β), an involute curve shape in which the radius Rs gradually increases.

On the other hand, the cam 40 for opening and closing the throttle valve
Is a plate cam that is externally fitted and fixed to the back shaft 2 side of the rotating shaft 22, and its outer peripheral surface is a cam surface 40.
It is a.

An intermediate portion of the cam surface 40a has a support shaft 43.
The rounded convex portion 46a of the L-shaped cam-side half body portion 46 of the throttle valve opening / closing lever 45 swingably supported in the case 21 comes into contact with the lever 45, and the opposite cam side of the lever 45 is provided. A coil spring 48 for pressing the rounded convex portion 46a against the cam surface 40a is stretched on the tip side of the half body portion 47, and the inner cable of the Bowden cable 50 is opened to open and close the throttle valve 7. Throttle cable 5
The two ends 52a of the two are connected. The other end portion 52b of the throttle cable 52 is connected to the throttle valve 7 as shown in FIG. 2, and the outer tube 52 of the Bowden cable 50 is attached to a fixed portion 21a such as the case 21. It is locked. The throttle valve 7 is always biased in the closing direction by a biasing means (not shown), and when the throttle cable 52 is pulled by the lever 45, it starts to open from the closed state (idle rotation opening degree). Is being done.

The cam surface 40a has an initial rotation position Ps, an intermediate rotation position Pm, and a final rotation position P shown in FIGS. 6, 7, and 8.
As will be understood by referring to e, the throttle valve 7
Is closed (idle rotation opening), the lever 45
From the starting point St at which the rounded convex portion 46a abuts to the intermediate portion Mt (rotational angle α) is an involute curve shape in which the radius Rt gradually increases, and the throttle valve 7 is fully opened (maximum opening degree) from the intermediate portion Mt. In the case of (), the end portion Et (rotation angle β) that comes into contact with each other is an arc having the same radius Rt.

In the present embodiment, the cooperative operating device 20 has a control mechanism 60 for controlling the starting and stopping of the motor 25 and the rotation direction.

The control mechanism 60 selectively takes three positions: a forward rotation position V for normally rotating the motor 25, a neutral position N for stopping the motor 25, and a reverse rotation position U for reversely rotating the motor 25. A momentary switch 70, a manual operation member 80 for causing the momentary switch 70 to take any one of the three positions V, N, and U, the shutter opening / closing cam 30 includes the start point portion Ss and the end point portion. It is configured to include first and second limit switches 90A and 90B for stopping the rotation of the motor 7 when rotated to Es.

Specifically, the momentary switch 70
As shown in FIGS. 3 and 9, the terminal lever 70a is always urged to return to the neutral position (center).
And six contacts 71 to 76 from the first to the sixth,
For example, if the terminal lever 70a is swung downward, the normal contact position where the first contact 71 and the third contact 73, and the second contact 72 and the fifth contact 75 are connected. By taking V and swinging the terminal lever 70a upward, for example, the first contact 71 and the fourth contact 7
4 and the reverse position U where the second contact 72 and the sixth contact 76 are connected and the terminal lever 70a is returned to the neutral position N, the connection state of each of the contacts 71 to 76 is changed. It is supposed to be released at the same time.

The first and second limit switches 90
A and 90B are disposed near the outer circumference of the shutter opening / closing cam 30, and are movable terminals that are pressed by elastic projection plates 98 and 99 by the projections 38 that project from the outer circumference of the cam 30. It has 96 and 97. The first and second limit switches 90A and 90B are normally closed (normally ON) switches, and the movable terminal 96,
When 97 is pressed by the convex portion 38, it changes from ON to O.
It is designed to switch to FF.

The manual operation member 80 is, for example, a manual operation lever 82 arranged on the left side portion of the backpack mount 2.
And the terminal lever 7 of the momentary switch 70.
One end side (84a), which is swingably supported by the support shaft 86 in the case 21 so as to swing 0a up and down.
Is provided with a bifurcated L-shaped swing lever 84, and a linkage member 85 such as a Bowden cable connecting the manual operation lever 82 and the swing lever 84. The swing lever 84 is normally returned to the neutral position N by a torsion coil spring 88 (see FIG. 4).

Therefore, in the power spraying machine 1 of the present embodiment, when starting the chemical spraying operation, the manual operation member 80 is operated to swing the terminal lever 70a of the momentary switch 70 downward, for example. Then, the normal rotation position V is obtained. At this time, the shutter opening / closing cam 30 moves the initial rotation position Ps (the cam groove 30).
The shutter opening / closing lever 3 is provided at the starting point Ss of a.
No. 5 is in contact with the roller 36), the second limit switch 90B is closed (ON), but the first limit switch 90A is open (OFF). As shown in FIG. 5, a current flows from the battery 65 mounted on the backpack frame 2 to the motor 25 in the positive direction via the second second limit switch 90B, and the motor 25 is normally rotated. As a result, the shutter opening / closing cam 30 and the throttle valve opening / closing cam 40 start to rotate normally (clockwise in FIG. 6) from the initial rotation position Ps.

In this case, both the cams 30 and 40 move from the initial rotational position Ps to the intermediate rotational position Pm (as shown in FIG. 7, the intermediate point portion Ms of the cam groove 30a).
The roller 3 of the shutter opening / closing lever 35
While the shutter opening / closing lever 35 is not swung during the rotation to the position (6 is in contact), the shutters 11 and 11 remain closed, but the throttle valve opening / closing lever 45 does not. The opening / closing cam 40 allows the opening / closing cam 40 to swing clockwise, so that the throttle valve 7 is set at the idle rotation opening (fully closed).
To the maximum opening (fully opened). As a result, the rotation speed of the internal combustion engine 5 rises to reach the rotation speed (for example, 6000 rpm) at which the blower 3 can obtain a sufficient medicine carrying capacity.

On the other hand, the shutter opening / closing cam 3
0 and the throttle valve opening / closing cam 40 move from the intermediate turning position Pm to the final turning position Pe (as shown in FIG. 8, at the end point Es of the cam groove 30a, the shutter opening / closing lever 35). While the roller 36 is rotated to the position where the roller 36 abuts), the shutter opening / closing lever 35 is swung counterclockwise as viewed in the figure by the cam groove 35 of the shutter opening / closing cam 30. Although the opening degrees of the shutters 11 and 11 are gradually increased, the throttle valve opening / closing lever 45 maintains the swing angle at the intermediate rotation position Pm, so that the throttle valve 7 reaches the maximum opening degree. Retained.

On the other hand, when the medicine spraying operation is finished, the manual operation member 80 is operated to swing the terminal lever 70a of the momentary switch 70 upward, for example, to move the reverse position U to the reverse position. Let it take. At this time, the shutter opening / closing cam 30 is at the final rotation position Pe, and the first limit switch 90A
Is closed (ON), but the second limit switch 9
Since 0B is open (OFF), the backpack mount 2
An electric current is caused to flow from the battery 65 mounted in the vehicle to the motor 25 in the reverse direction via the first limit switch 90A, and the motor 25 is rotated in the reverse direction.
As a result, the shutter opening / closing cam 30 and the throttle valve opening / closing cam 40 start to rotate in the reverse direction (counterclockwise in FIG. 8) from the final rotation position Pe.

Therefore, at the time of such a reverse rotation, the shutters 11, 11 are first closed and then the throttle valve 7 is closed.

Therefore, the shutter opening / closing cam 3
0 and the throttle valve opening / closing cam 40 is rotated between the intermediate rotation position Pm and the final rotation position Pe, the shutter is provided in a state in which the blower 3 has a sufficient medicine transport capability. Since 11 and 11 are opened, the medicines flow down into the volute case 3a of the blower 3 all at once without the sufficient medicine conveying ability as in the conventional case, and the spray pipe is provided. Stays in the portion 55 and the like and is not ejected to the outside, and the spray pipe portion 5
A defect such as the clogging of 5 is reliably prevented.

Further, since the cooperative operating device 20 includes the control mechanism 60 having the single motor 25, the manual operating member 80, etc., the opening / closing operation of the throttle valve 7 and the shutters 11, 11 are performed. It is possible to centralize and cooperate with the opening / closing operation of the shutters. As a result, the timing of opening the shutters 11, 11 is too early, the opening degree of the shutters 11, 11 is too large, the opening / closing operation of the shutters 11, 11. It is possible to reliably prevent an erroneous operation such as erroneous operation of opening and closing the throttle valve 7.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment, and is designed in a range not departing from the spirit of the invention described in the claims. It can be changed as appropriate.

[0046]

As can be understood from the above description, in the power spreader according to the present invention, the throttle valve always opens first,
Since the shutter of the metering device is opened only after the sufficient drug delivery capacity has been obtained by the blower, the drug can be delivered in a state where sufficient drug delivery capacity is not obtained as in the past. It is possible to reliably prevent such a problem that the air blows down to the blower all at once, stays in the spray pipe section or the like and is not ejected to the outside, and the spray pipe section is clogged.

Further, since the cooperative operation means is provided with a control mechanism having a single motor, a manual operation member, etc., it is possible to unify and operate the opening / closing operation of the throttle valve and the opening / closing operation of the shutter. Therefore, erroneous operations such as opening the shutter too early, opening the shutter too large, and mistakenly opening and closing the shutter and opening and closing the throttle valve can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a power spreader according to the present invention.

FIG. 2 is a left side view of the power spreader shown in FIG.

FIG. 3 is a partially cutaway front view showing, in an enlarged manner, a cooperative operation device section provided in the power spreader shown in FIG. 1.

FIG. 4 is a partially cutaway plan view showing, in an enlarged manner, a cooperative operation device portion provided in the power spreader shown in FIG. 1.

5 is a partially cutaway left side view showing, in an enlarged manner, a cooperative operation device section provided in the power spreader shown in FIG. 2. FIG.

6 is an operation explanatory view showing a state in which a shutter opening / closing cam of the cooperative operation device shown in FIG. 1 is in an initial rotation position.

7 is an operation explanatory view showing a state in which a shutter opening / closing cam of the cooperative operation device shown in FIG. 1 is in an intermediate rotation position.

8 is an operation explanatory view showing a state in which a shutter opening / closing cam of the cooperative operation device shown in FIG. 1 is at a final rotation position.

9 is a circuit configuration diagram of a control mechanism of the cooperative operation device shown in FIG.

[Explanation of symbols]

1 power spreader 3 blower 4 drug tank 5 Internal combustion engine 7 Throttle valve 10 Metering device 11, 11 Shutter for adjusting spraying amount 20 Cooperation operation device (cooperation operation means) 25 motor 30 Cam for opening and closing the shutter 35 Lever for opening and closing the shutter (following member) 40 Throttle valve opening / closing cam 45 Throttle valve opening / closing lever (following member) 60 control mechanism 70 Momentary switch 80 Manual operation member 90A, 90B limit switch O rotation axis Ps initial rotation position Pm Intermediate rotation position Pe final turning position V forward rotation position N neutral position U Reverse position

Claims (7)

[Claims] 1. A medicine tank (4) for storing medicines such as powder and granules, a blower (3) for conveying the medicine in the medicine tank (4) to the outside, and a blower (3) for rotation. An internal combustion engine (5) for driving, and a metering device (10) having a spray amount adjusting shutter (11, 11) between the chemical tank (4) and the blower (3). In the interposed power spreader (1), cooperative operation means (20) for performing the opening / closing operation of the throttle valve (7) of the internal combustion engine (5) and the opening / closing operation of the shutters (11, 11) in cooperation with each other. The power spreader is characterized by being deployed. 2. The cooperative operation means (20) starts opening the shutter (11, 11) after the throttle valve (7) is opened to a predetermined opening or more, and the shutter (11, 11) is opened. The power distribution according to claim 1, wherein an operation of starting to close the throttle valve (7) from the opened state equal to or more than the predetermined opening degree is performed after the opened state is closed. Machine. 3. The shutter opening / closing cam (30) and the throttle valve opening / closing cam (40), wherein the cooperation operation means (20) is integrally rotated on a common rotation axis (O).
And follower members (35, 45) for converting the rotation of the cams (30, 40) into opening / closing operations of the shutters (11, 11) and the throttle valve (7). The power spreader according to claim 1 or 2, which is characterized. 4. The shutter opening / closing cam (30) and the throttle valve opening / closing cam (40) are moved from an initial rotation position (Ps), which is a starting point, to an intermediate rotation position (Pm), which is an intermediate point. While being rotated, the shutters (11, 11) are kept closed, but the throttle valve (7) is gradually opened from the closed state to the maximum opening degree, and the throttle valve (7) is opened from the intermediate rotation position (Pm). The opening of the shutter (11, 11) is gradually increased while the throttle valve (7) is kept at the maximum opening while being rotated to the final rotation position (Pe) which is the end point. The power spreader according to claim 3, wherein the shutter opening / closing cam (30) and the throttle valve opening / closing cam (40) are set in shape. 5. The cooperation operation means (20) is a single motor (25) for integrally driving the shutter opening / closing cam (30) and the throttle valve opening / closing cam (40) in both forward and reverse directions. ) Is provided, The power spreader of Claim 3 or 4 characterized by the above-mentioned. 6. The cooperation operation means (20) according to claim 5, wherein the cooperation operation means (20) is provided with a control mechanism (60) for controlling the start and stop and the rotation direction of the motor (25). Power spreader. 7. The control mechanism (60) comprises a normal position (V) for normal rotation of the motor (25), a neutral position (N) for stopping the motor (25), and the motor (25). Momentary switch (70) that can selectively take three positions: reverse position (U) to reverse
A manual operation member (80) for causing the momentary switch (70) to take one of the three positions (V, N, U), the shutter opening / closing cam (30) and the throttle valve opening / closing cam. Is the initial rotation position (P
s) and limit switches (90A, 90B) for stopping the rotation of the motor (25) when rotated to the final rotation position (Pe). The power spreader according to claim 6.