JP2769780B2 - Metering device for power spreaders - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metering device for a power spreader such as a backpack power spreader, and more particularly to a metering device capable of performing a wide range of metering and precise minute metering.

[0002]

2. Description of the Related Art In a metering device of a backpack power spreader, Japanese Patent Application Laid-Open No. H5-220427 discloses a method for accurately adjusting a very small amount while realizing a wide range of metering.
The outlet in the shutter case is opened and closed with a large butterfly valve, and the small butterfly valve is opened and closed with the opening in the center of the large butterfly valve. In this case, both butterfly valves are operated.
As large and small butterfly valves swing around a common swing axis, the swing axis for the large butterfly valve is tubular,
Into which a small butterfly valve swing axis passes,
At the end of the oscillating shaft, the locking screw is tightened, loosened or removed from the radial direction of the oscillating shaft to fix and release the two oscillating shafts from each other.

In the metering device disclosed in Japanese Patent Application Laid-Open No. 5-220427, the swing shaft for the small butterfly valve is inserted into the swing shaft for the large butterfly valve and is hidden.
Even if the movement is not visible, the operator can tighten, loosen or remove the lock screw to switch between wide-range metering and micro metering,
In some cases, confirmation cannot be made and tightening or loosening is insufficient, and switching may not be performed correctly. In the case of a spraying agent having a large medicinal capacity, if it is intended to switch to a small amount of metering, but it is actually kept in a wide range, it leads to an environmental problem.

On the other hand, in the metering device disclosed in Japanese Patent Application No. 4-215725, the outlet of the spraying agent is divided into two sections.
Each section is opened and closed by a separate butterfly valve, and in a wide range of metering, both butterfly valves are operated,
In the case of a small amount of metering, only one of the butterfly valves is operated. Since the movement of the connecting arm can be seen from the outside of the shutter case, it is possible to confirm whether the control has been switched to the wide range metering or the minute metering prior to the spraying operation. In this metering device, in the embodiment, connection and disconnection of both butterfly valves by the connecting arm are performed by inserting and removing one end of the connecting arm into a predetermined insertion hole. In order to prevent drooping of the connecting arm and to hold the butterfly valve on the swing stop side in the closed position, an end on the release side of the connecting arm is inserted into a fixing insertion hole. In addition, an R pin is mounted to reliably prevent the end of the connecting arm from coming out of the insertion hole at the time of connection and disconnection.

[0005]

Problems to be Solved by the Invention Japanese Patent Application No. Hei 4-21572
The problems of the embodiment of the metering device of No. 5 are as follows. (A) At the time of connection and disconnection, R pin is attached,
Since it is removed, the R pin as a part is easily lost. (B) One end of the connecting arm is locked in the fixing through hole when the connection is released. However, the length of the connecting arm is fixed due to the restriction of the link ratio between the two butterfly valves. There is also a restriction on the installation position of the insertion hole for use, so that there is a problem in maintaining the butterfly valve for which the swing operation is stopped in the closed position.

An object of the present invention is to provide a metering device for a power spreader in which switching between a wide-range metering and a minute metering can be confirmed from the outside by the movement of a connecting arm. It is to simplify the operation of disconnection. It is still another object of the present invention to allow the butterfly valve, whose swing is stopped, to be held in the closed position without any trouble when the connection of the connection arm is released. It is an object of the present invention to prevent interference by the connecting arm when the connecting arm is disconnected. An object of the invention of claim 4 is to simplify the structure in the invention of claim 3.

[0007]

The present invention will be described with reference to the drawings corresponding to the embodiments. The metering device (10) of the power spreader according to the first aspect has the following components (a) to (f). (A) An outlet from which a spray is discharged from a spray tank, which is horizontally divided into a first section (16) and a second section (18).
(14) (b) A first butterfly valve (24) that swings by operating a shutter operating member to open and close the first section (16). A second butterfly valve (26) for swinging about a parallel swing axis to open and close the second section (18); (d) a shutter case defining an outlet (14) inside;
A first butterfly valve (24) arranged outside of (12)
And a first swing lever (30) and a second swing lever (32) swinging integrally with the second butterfly valve (26). (E) The swing axis of the first butterfly valve (24). First in the direction of
The second butterfly valve (26) is opened and closed so as to be relatively movable with respect to the swing lever (30) and the second swing lever (32), and to open and close the first butterfly valve (24). A first butterfly valve (30) and a second swing lever (32) coupled at a first coupling point (44) and a second coupling point (46), respectively; In the movement of the pivot axis in the first direction (24), the first pivot lever (30) or the second pivot lever
(F) connecting arm (4) in a second direction opposite to the first direction;
Arm biasing member for biasing 2) (50)

[0008] The metering device (10) of the power spreader according to claim 2 is
The metering device (10) for the power spreader according to claim 1, further comprising a butterfly valve biasing member (52) for biasing the second butterfly valve (26) in the closing direction.

The metering device (10) of the power spreader according to claim 3 is
The metering device (10) for a power spreader according to claim 1 or 2,
Further, the first swing lever (30) or the second swing lever (3
A separating spring (50) is provided for swinging the connecting arm (42) in the separating direction when the connecting arm (42) is separated from 2).

According to a fourth aspect of the present invention, there is provided the power dispenser metering device according to the third aspect, wherein the arm urging member is further provided with a separating spring. A coil spring (50) having the function of (50).

[0011]

According to the first aspect of the present invention, the first swing lever (30) and the second swing lever (32) are connected to the connecting arm (42) in the case of wide-area spraying. Connected to each other via The operation of the shutter operation member is the first butterfly valve
The first butterfly valve (24) swings in conjunction with the operation of the shutter operating member. Second butterfly valve
(26) is a first swing lever (30) via a connecting arm (42).
Swings in conjunction with the opening and closing of the first butterfly valve (24) by the operating force transmitted from the controller. As a result, the first butterfly valve (24) and the second butterfly valve (26) respectively move the first section (14) of the outlet (14) with the operation of the shutter operation member.
(16) and the second section (18) are opened and closed, and the increase / decrease ratio of the opening amount of the entire outlet (14) to the increase / decrease amount of the operation amount of the shutter operation member increases.

In the case of a small amount of spraying, the connecting arm (42) is displaced in the first direction of the swing axis of the first butterfly valve (24) against the urging force of the arm urging member (50). Let it. With this displacement, the connecting arm (42) moves the first rocking lever (30) or the second rocking lever (30) at one of the first connecting point (44) and the second connecting point (46). 32), the first butterfly valve (24) and the second butterfly valve (26) are disconnected from each other. As a result, the second butterfly valve (26) stops opening and closing the second section (18), and only the first butterfly valve (24) receives the first section (16) in response to the operation of the shutter operating member. ) Is opened and closed, and the increase / decrease ratio of the opening amount of the entire outlet (14) to the increase / decrease amount of the operation amount of the shutter operation member is reduced.

In the metering device (10) for a power spreader according to the second aspect, the connecting arm (42) connects the first swing lever (30) and the second swing lever (32) to each other. The second butterfly valve (26) is displaced in the opening direction against the urging force of the butterfly valve urging member (52) against the operating force in the opening direction from the connecting arm (42). I do. With the release of the connection by the connecting arm (42), the operating force from the first swing lever (30) is released from the second butterfly valve (26), and the biasing member (52) for the butterfly valve is released. Swings according to the biasing force of (3) to maintain the closed position.

According to the third aspect of the present invention, the connecting arm is provided with the first swinging point at one of the first connecting point and the second connecting point. Moving lever (30) or second
When the lever is separated from the swing lever (32), the spring (50) separates from the first connecting point (44) and the other of the second connecting point (46) as a fulcrum. The lever is separated from the lever (30) or the second swing lever (32). First swing lever (30) (when separated at the first connection point (44)) or connecting arm
(42) (: when separated at the second connection point (46))
It swings with the swing of the first butterfly valve (24), but the interference of the connecting arm (42) with the first swing lever (30) or the second swing lever ( The interference of 32) is avoided.

According to a fourth aspect of the present invention, the coil spring (50) is configured to move the second butterfly axis (24) of the first butterfly valve (24) by the restoring force from the axially compressed state. Biasing the connecting arm (42) in the direction, the first connecting point of the connecting arm (42).
(44) and the connection at the second connection point (46) is maintained. The coil spring (50) is connected to the first swing lever (30) or the second swing lever (30).
When the connection of the connecting arm (42) to the swinging lever (32) is released, the connecting arm (42) is swung by the biasing force in the torsional direction, and the first swinging lever (30) or the second 2 swing levers (32)
Away from

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIGS. 1, 2 and 3 are a plan view of the metering device 10 when the first and second butterfly valves 24 and 26 are connected, a vertical cross-sectional view of the metering device 10 at the outlet 14, and FIGS. FIG. 9 is a diagram showing a connection relationship between second swing levers 30 and 32. 4 and 5 are vertical sectional views of the metering device 10 at the outlet 14 when the first and second butterfly valves 24 and 26 are disconnected.
FIG. 4 is a diagram showing a connection relationship between first and second swing levers 30 and 32. The shutter case 12 is disposed between the upper spraying agent tank and the lower blower in a well-known backpack power spreader (not shown), and the spraying agent from the spraying agent tank is transferred to the conveying passage of the blower. An outlet 14 in a substantially horizontal plane is defined inside. The outlet 14 is divided into a first section 16 and a second section 18 having substantially the same area in the horizontal direction, and the first and second swing shafts 20 and 22 are parallel to each other, and each of the first and second swing shafts And rotatably supported by the shutter case 12 across the second sections 16 and 18. The first and second butterfly valves 24 and 26 are fixed to the first and second swing shafts 20 and 22 by pan screws 28, respectively.
It swings together with 20, 22 to open and close the first and second sections 16, 18 respectively. First and second swing lever arms
The reference numerals 30a and 32a are disposed outside the shutter case 12, and are integrally fixed in the rotation direction to the protruding ends of the first and second swing shafts 20 and 22 from the shutter case 12, respectively. And the second swing levers 30, 32.

FIG. 6 is a perspective view of the first swing lever 30 including the first swing shaft 20 and the first swing lever arm 30a. 3, 5, and 6, the first swing lever 30
Is a double arm lever, and a link rod (not shown) connected to a swing axis (not shown) as a shutter operating member
Locking holes 34 for selectively inserting the upper end of the
Are provided on one side of the first swing shaft 20 at appropriate intervals. As the link rod is locked in the link locking hole 34 near the first rocking shaft 20, the ratio of the amount of rocking of the first rocking lever 30 to the amount of operation of the shutter lever increases. The arm insertion hole 36 is formed in a portion of the first swing lever arm 30a opposite to the link locking hole 34 with respect to the first swing shaft 20.

FIG. 7 is a perspective view of a second swing lever 32 including the second swing shaft 22 and the second swing lever arm 32a. 3, 5, and 7, the second swing lever 32
Is a single-arm lever having a second swing lever arm 32a, and has an arm insertion hole 38 at the tip end thereof.
A spring locking hole 40 is provided on the side of the second swing shaft 22 slightly more.

FIG. 8 is a perspective view of the connecting arm 42. 1, 3, 5 and 8, the connecting arm 42 has pin portions 44 and 46 protruding parallel to each other at both ends. The pin portions 44 and 46 are rotatably fitted in the arm insertion holes 36 (FIG. 6) and the arm insertion holes 38 (FIG. 7) of the first and second swing lever arms 30a and 32a, respectively. 44 is shorter than the pin portion 46.

In FIG. 1, a retaining ring 48 is fitted to the tip of the pin portion 46 with a rotation preventing function, and prevents the pin portion 46 from coming off from the second swing lever 32. Coil spring 50
Are fitted to the pin portion 46 and both ends are engaged with the spring locking holes 40 (FIG. 5) of the second swing lever arm 32a and the spring locking holes 40 (no reference numeral) of the retaining ring 48. And urges the pin portion 46 in the distal direction, and connects the connecting arm 42 to the second swing shaft.
Bias upwards around 22. The coil spring 52 is fitted on the second swinging shaft 22 and has both ends at the shutter case 12 respectively.
And the second swing valve 22 is urged in the closing direction of the second butterfly valve 26 by being locked by the spring locking hole (not shown) and the edge of the connecting arm 42.

The operation of the embodiment will be described. In the case of widespread application, the first and second swing shafts 20 and 22 are connected to the connecting arm 42.
(See FIGS. 1 and 3). The operation of the shutter lever is transmitted to the first swing lever 30,
The first swing lever 30 swings in conjunction with the operation of the shutter lever. With the swing of the first swing lever 30, the first swing shaft 20 swings integrally with the first swing lever 30, and the connecting arm 42 moves the pin portion 44 to the first position. Is pivoted about the pivot axis 20 of the second pivot shaft 22 to pivot the pin portion 46 around the pivot axis of the second pivot shaft 22 against the urging force of the coil spring 50 in the circumferential direction. As a result, the first and second butterfly valves 24, 26
Are connected to the outlets 14 with the operation of the shutter lever.
The first and second sections 16 and 18 are opened and closed (FIG. 2), and the increase / decrease ratio of the opening amount of the entire outlet 14 to the increase / decrease amount of the operation amount of the shutter lever increases.

In the case of a small amount of spraying, the connecting arm 42 is pushed toward the shutter case 12 against the urging force of the coil spring 50 in the axial direction. The connecting arm 42 moves toward the shutter case 12, and the pin portion 44 is pulled out from the arm insertion hole 36 of the first swing lever arm 30a. Then, it swings upward around the pin portion 46 in accordance with the urging force of the coil spring 50 (FIG. 5), separates from the first swing lever 30, and moves the pin portion 44 against the swing of the first swing lever 30. To prevent interference. on the other hand,
The second butterfly valve 26 swings in the closing direction by the urging force of the coil spring 52 and is held at the closed position. Thereafter, in response to the operation of the shutter lever, only the first butterfly valve 24 opens and closes the first section 16 (FIG. 4). The increase / decrease ratio of the opening amount decreases.

In the illustrated embodiment, the pin portion of the connecting arm 42 is
44 is shorter than pin 46, but pin 46 is
The pin portion 46 may be detachable from the second swing lever 32 by making the pin portion 46 shorter than 44. In that case, a retaining ring 48 and a coil spring 50 are attached to the longer pin portion 44, and the coil spring 50 is
The torsional force is set so as to urge the connecting arm 42 in the direction of swinging downward around the first swing shaft 20.

[0024]

According to the first aspect of the present invention, the arm urging member holds the connection at the first and second connection points, and is pushed by the connecting arm against the urging force of the arm urging member. Since the decoupling of one of the first and second connection points is performed, loss of parts is prevented,
In addition, the operation of releasing the connection with the first and second butterfly valves is simplified.

According to the second aspect of the present invention, the second butterfly valve is held at the closed position by the biasing member for the butterfly valve when the connection to the first butterfly valve is released, so that the first and second butterfly valves are kept.
Despite the restriction on the length of the connecting arm from the link ratio of the butterfly valve, the second butterfly valve can be accurately held in the closed position without any trouble.

According to the third aspect of the present invention, the connecting arm is sufficiently separated from the first or second rocking lever by the separating spring in the disconnected state, so that the first or second rocking lever and the connecting arm are separated. The first butterfly valve can be operated without any trouble.

According to the fourth aspect of the present invention, the structure of the coil spring is simplified because the coil spring also functions as the arm urging member and the separating spring.

[Brief description of the drawings]

FIG. 1 is a plan view of a metering device when connecting first and second butterfly valves.

FIG. 2 is a vertical cross-sectional view of the metering device at an outlet when the first and second butterfly valves are connected.

FIG. 3 is a diagram showing a connection relationship between first and second swing levers when the first and second butterfly valves are connected.

FIG. 4 is a vertical sectional view of the metering device at an outlet when the first and second butterfly valves are disconnected.

FIG. 5 is a view showing a connection relationship between the first and second swing levers when the connection between the first and second butterfly valves is released.

FIG. 6 is a perspective view of a first swing lever including a first swing shaft and a first swing lever arm.

FIG. 7 is a perspective view of a second swing lever including a second swing shaft and a second swing lever arm.

FIG. 8 is a perspective view of a connecting arm.

[Description of Signs] 10 Metering device 12 Shutter case 14 Outlet 16 First section 18 Second section 24 First butterfly valve 26 Second butterfly valve 30 First swing lever 30a First swing Lever arm 32 Second swing lever 32a Second swing lever arm 42 Connecting arm 44 Pin portion (first connection point) 46 Pin portion (second connection point) 50 Coil spring (biasing member for arm, Coil springs,
Spring for separation) 52 Coil spring (biasing member for butterfly valve)

Claims (4)

(57) [Claims] (A) a discharge port (14) which is horizontally divided into a first section (16) and a second section (18), and from which a spray from a spray agent tank is discharged, and (b) a shutter. A first butterfly valve (24) that swings by operation of an operation member to open and close the first section (16), (c) swinging parallel to the swing axis of the first butterfly valve (24); A second butterfly valve (26) that swings around an axis to open and close the second section (18); (d) a shutter case (12) defining the outlet (14) inside; A first one disposed outside and swinging integrally with the first butterfly valve (24) and the second butterfly valve (26), respectively.
(E) the first swing lever (30) and the second swing lever (32) in the direction of the swing axis of the first butterfly valve (24). The second swing lever (3
The first swing lever (30) is moved so as to be relatively movable with respect to 2) and linked to the opening and closing of the second butterfly valve (26) in conjunction with the opening and closing of the first butterfly valve (24). ) And the second pivot lever (32) to a first coupling point (44), respectively.
And at the second connection point (46), the first butterfly valve (24) moves in the first direction of the swing axis of the first butterfly valve (24).
A swing arm (30) or a connecting arm (42) adapted to be separated from the second swing lever (32); and (f) the connecting arm in a second direction opposite to the first direction. Connecting arm (4
A metering device for a power spreader, comprising an arm urging member (50) for urging the arm. 2. The power dispersing machine according to claim 1, further comprising a butterfly valve biasing member for biasing said second butterfly valve in a closing direction. Quantity device. 3. The first swing lever (30) or the second swing lever (30).
A separating spring for swinging the connecting arm (42) in the separating direction when the connecting arm (42) is separated from the swing lever (32)
The metering device for a power spreader according to claim 1 or 2, wherein the metering device has (50). 4. The metering device according to claim 3, wherein the arm urging member (50) is a coil spring (50) serving also as a function of the separation spring (50). apparatus.