JP2531564B2 - Power spreader metering device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power spreader metering device, and more particularly to a power spreader metering device capable of accurately performing a minute amount metering.

[0002]

2. Description of the Related Art A power spreader such as a backpack power spreader is equipped with a metering device at the bottom of a spray agent tank in order to adjust the spray flow rate of the spray agent, and the flow cross-sectional area of the opening is increased or decreased by a butterfly valve or the like. Then, the amount of the spraying agent is adjusted. In the conventional butterfly valve type metering device, the opening is opened and closed by one butterfly valve, and the butterfly valve is located upstream in the flow direction of the pressurized air passing below the opening in parallel to the opening surface. The opening is opened so as to displace the downstream half and the downstream half, respectively.

[0003]

The problems of the conventional metering device for such a power spreader are as follows. (A) In order to minutely adjust the spraying flow rate of the spraying agent, the rotation angle of the butterfly valve must be finely increased or decreased, which makes the minute adjustment inaccurate. (B) When the butterfly valve is opened, the respective halves of the butterfly valve rotate downward and upward, respectively, but the compressed air flows into the halves of the butterfly valve that is flowing upwards. There is a difference in the amount of spraying agent falling on the half side of the butterfly valve that does not come, which causes uneven distribution of the amount of spraying agent on the upper side of the butterfly valve in the plane direction of the opening. Therefore, when the remaining amount of the spraying agent becomes low, the spraying flow rate of the spraying agent decreases,
It fluctuates. (C) In order to secure a large spraying flow rate, it is necessary to increase the maximum opening of the butterfly valve, and along with this, a cover that covers the upper part of the butterfly valve and forms a stirring chamber with the butterfly valve. Will increase in height, which will lead to an increase in height of the power spreader.

An object of the present invention is to provide a metering device for a power spreader which can overcome the above problems.

[0005]

The present invention will be described using reference numerals in the drawings corresponding to the embodiments. The metering device (28) of the power spreader (10) of the present invention has the following components (a) to (d). (A) An opening (36) for supplying pressurized air from the lower side and dropping the upper spraying agent (26) (b) A first section for opening and closing one section of the opening (36) by operating an operating member Butterfly valve (40) (c) Second butterfly valve (42) that can open and close the other section of opening (36) (d) Second butterfly valve (42) by fully closing position and operating member Switching means for switching to the open / close motion position
(86,102)

[0006]

When the spraying agent (26) is sprayed while finely adjusting the spraying flow rate, the switching means (86, 102) is switched to set the second butterfly valve (42) to the fully closed position. Thereby, the first
Only the butterfly valve (40) of the
The opening and closing movement is performed, and the flow cross-sectional area of only one section of the opening (36) is increased or decreased by the first butterfly valve (40).

When the spraying agent (26) is sprayed while ensuring a large spraying flow rate and a wide flow rate range, the switching means (86, 102) is switched to move the second butterfly valve (42) to the moving position. As a result, the first butterfly valve (40) and the second butterfly valve (42) both open and close in accordance with the operation of the operation member, and the flow of the one section and the other section of the opening (36) is performed. The cross-sectional area is increased or decreased by the first butterfly valve (40) and the second butterfly valve (42), respectively.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 9 is a vertical sectional view of the backpack power spreader 10. The blower 12 has an impeller 16 driven by an engine (not shown) in the fan case 14, and the pressurized air generated by the impeller 16 is generated between the inner peripheral side of the fan case 14 and the impeller 16. It is guided to the discharge port 20 of the fan case 14 through the scroll-shaped passage 18 between the periphery and the periphery. Bent tube 22 is a fan case 14
It is fitted into the discharge port 20 of the rotatably in the circumferential direction. The spray agent tank 24 stores the spray agent 26 inside, and
It is placed and fixed on the upper part of 14 through a metering device 28.
The discharge case 30 is arranged below the metering device 28, and the discharge pipe 32
Discharge from the spray agent tank 24 via the metering device 28
The spraying agent 26 falling to 30 is guided toward the discharge port 20.

1 and 2 are a vertical sectional view and a plan view of a dosing device 28. The metering case 34 has a substantially rectangular opening 36 in the center of the inside and is placed on the upper side of the discharge case 30. As shown in A of FIG. 1, part of the pressurized air in the scroll passage 18 (FIG. 9) of the blower 12 flows from one short side of the substantially rectangular opening 36 to the other short side thereof. , Is sent to the lower side of the opening 36 through the pressurized air introduction hole 38. Opening
36 is divided into two equal parts in the long side direction, and the respective half sections on the upstream side and the downstream side in the pressurized air flow direction are the first and second butterfly valves.
The distribution cross section is controlled by 40 and 42. The first and second butterfly valves 40 and 42 extend in parallel to the short side direction of the opening 36 and are rotatably supported by the metering case 34 by rotating shafts 44 and 46 and screws 52 and 54. Rotating shaft 4
The plates 48 and 50 fixed to the plates 4 and 46 and the upper surface side of the plate 48 and the plate 50.
And sealing members 56 and 58 that are fixed to the lower surface side of the and seal the edges of the opening 36 when fully closed.

The valve lever 60 is integrally and rotationally coupled to the end of the rotary shaft 44 projecting from the metering case 34, and links the movement of the metering lever (not shown) by an operator to a link (see FIG. (Not shown) to rotate the rotary shaft 44. The drive gear 62 is fixed by a screw 64 to the protruding end of the rotary shaft 44 on the side opposite to the valve lever 60 with respect to the metering case 34. The driven gear 66 corresponds to the driving gear 62 with respect to the metering case 34.
It is fitted on the protruding end of the rotary shaft 46 on the same side as the above so as to be slidable in the axial direction and the rotational direction. The compression coil spring 68 is fitted on the rotary shaft 46 between the driven gear 66 and the spring seat 70 so as to be wound around the rotary shaft 46, and the driven gear 66 is fixed to the metering case 34.
Is urged toward. The screw 72 is screwed to the end surface of the rotary shaft 46 and prevents the spring seat 70 from coming off the rotary shaft 46.

FIG. 5 is a perspective view of the protruding portion of the rotary shaft 46 in the metering case 34. The pair of locking plates 74 is a metering case.
It is integrally formed on the outer surface of 34 and extends horizontally on both sides of the rotary shaft 46. The locking pin 76 is fixed to the rotary shaft 46 at a position appropriately deviated from the locking plate 74 toward the tip side of the rotary shaft 46 in the axial direction of the rotary shaft 46, and projects outward in the radial direction of the rotary shaft 46.

FIG. 6 is a perspective view of the driven gear 66. The driven gear 66 has a gear portion 78 having the same number of teeth as the drive gear 62, and a boss portion 80 projecting from the gear portion 78 in the axial direction.
The pair of long grooves 82 are separated from each other by 180 ° in the circumferential direction of the boss portion 80 and extend in the axial direction from the end surface of the boss portion 80. 1
The pair of short grooves 84 are arranged in the circumferential direction of the boss portion 80 from the pair of long grooves 82 to 9
The long groove 82 is formed at a position separated by 0 ° from the end surface of the boss portion 80.
It extends a shorter length.

In FIG. 2, the driven gear 66 is a rotary shaft 46.
In the rotation direction of, the locking pin 76 of the rotary shaft 46 is inserted into the short groove of the boss 80.
In addition to being in a position to be fitted into 84, the rear end of the short groove 84 is brought into contact with the locking pin 76 by the urging force of the compression coil spring 68, and is in the axial position where the gear 78 is engaged with the drive gear 62. . The gear type switching means 86 includes a driving gear 62 and a driven gear 6
6, a spring seat 70, a locking plate 74, etc., and a movement position for interlocking the second butterfly valve 42 with the first butterfly valve 40, and interlocking the second butterfly valve 42 with the first butterfly valve 40. To the fully closed position.

FIG. 3 is a vertical sectional view of the metering device 28 when the second butterfly valve 42 is fixed at the fully closed position, and FIG. 4 shows when the second butterfly valve 42 is fixed at the fully closed position. FIG. 8 is a plan view of a gear type switching means 86. In FIG. 4, the driven gear 66
Is located at a position where the locking pin 76 of the rotary shaft 46 is fitted into the long groove 82 of the boss portion 80 in the rotation direction of the rotary shaft 46.
The urging force of 68 moves axially toward the metering case 34 until the deep ends of the long groove 82 and the short groove 84 contact the locking pin 76 and the locking plate 74, respectively. As a result, the gear part 78
Is separated from the drive gear 62 toward the metering case 34 and is in a non-meshing state, and the rotation shaft 46 is restrained from rotating by a locking plate 74 via the driven gear 66, and The butterfly valve 42 is fixed in the fully closed position as shown in FIG.
When the driven gear 66 is switched from the position shown in FIG. 2 to the position shown in FIG. 4, the driven gear 66 is temporarily moved toward the spring seat 70 against the compression coil spring 68, and the gear portion of the driven gear 66 is moved. 78 is biased toward the spring seat 70 with respect to the drive gear 62, and then the driven gear 66 is relatively rotated 90 ° with respect to the rotation shaft 46, so that the long groove 82 and the short groove 84 in the rotation direction of the rotation shaft 46. Are in rotational positions corresponding to the locking pin 76 and the locking plate 74, respectively, and the driven gear 66 is moved toward the metering case 34 by the biasing force of the compression coil spring 68, and the gear portion 78 is moved relative to the drive gear 62. Bias toward the locking plate 74.

The operation of the metering case 34 will be described. When the spraying agent 26 is sprayed while finely adjusting the spraying flow rate, as shown in FIG.
Locking pin 76 and locking plate 74 in the long groove 82 and the short groove 84, respectively.
Is set to a rotational position in which is inserted. As a result, the driven gear 66
The gear portion 78 of the drive gear 62 is disengaged from the drive gear 62, the rotation of the rotary shaft 44 is not transmitted to the rotary shaft 46, and
The butterfly valve 42 is fixed to the locking plate 74 via the rotary shaft 46 and the boss portion 80 of the driven gear 66, and is fixed to the fully closed position. An operator carrying the backpack power spreader 10 on his / her back operates a metering lever (not shown) at the hand as an operation member of the metering device 28, so that the valve lever 60 moves to the center line of the rotary shaft 44. Rock around. Along with this, only the first butterfly valve 40 opens and closes, and only the flow cross-sectional area of only the half of the opening 36 on the side of the pressurized air introduction hole 38 is increased or decreased by the first butterfly valve 40.

When the spraying agent 26 is sprayed while ensuring a large spraying flow rate and a wide flow rate range, as shown in FIG.
The driven gear 66 is set to a rotation position where the locking pin 76 is fitted into the short groove 84 of the boss portion 80. As a result, the gear portion 78 of the driven gear 66 meshes with the drive gear 62, and the rotation of the rotary shaft 44 is transmitted to the rotary shaft 46 via the drive gear 62 and the gear portion 78 of the driven gear 66. Thus, by the operation of the metering lever (not shown) by the operator, the rotary shafts 44 and 46 rotate in opposite directions to each other, and the half of the opening 36 on the side of the pressurized air introduction hole 38 and on the opposite side thereof. The flow cross section is increased or decreased by the first and second butterfly valves 40 and 42, respectively.

FIGS. 7 and 8 are vertical sectional views of the metering device 28 when the link type switching means 102 places the second butterfly valve 42 in the moving position and the fully closed position, respectively. The link type switching means 102 is provided in place of the gear type switching means 86 of FIGS. 2 and 4. The levers 90 and 92 are integrally and rotatably fixed to the end surfaces of the first and second butterfly valves 40 and 42, respectively, and the stay 98 is below the lever 90 and the fan case 14 is provided.
It is fixed to. Insertion hole 95 (Fig. 8) and insertion hole 100
(Fig. 7) are provided in the lever 90 and the stay 98, respectively,
The rod 94 is selectively inserted into the insertion hole 95 or the insertion hole 100, and is rotatably coupled to the lever 92. R
The pin 96 can be inserted into and removed from a portion of the rod 94 protruding from the insertion holes 95 and 100 in the radial direction, and is locked by the rod 94 at the time of insertion to prevent the lever 90 from coming off the insertion holes 95 and 100. Block. The link-type switching means 102 uses these levers 9
The second butterfly valve 42 is constituted by 0, 92, a rod 94, etc., and switches the second butterfly valve 42 to the moving position and the fully closed position.

When the second butterfly valve 42 is in the moving position, the rod 94 is inserted through the insertion hole 95 of the lever 90 as shown in FIG.
It is in a state in which it is rotatably connected to 0 and 92. As a result, the rotation of the rotary shaft 44 is transmitted to the rotary shaft 46 via the rod 94, the first and second butterfly valves 40, 42 rotate in opposite directions at the same opening degree, and the flow cross-sectional area of the opening 36. Increase and decrease in cooperation.

When the second butterfly valve 42 is in the fully closed position, the rod 94 is inserted into the insertion hole 100 of the stay 98 and the lever 92 is connected to the lever 90, as shown in FIG. The second butterfly valve 42 is fixed in the fully closed position while being interlocked and restrained from rotating by the stay 98 via the rod 94. As a result, only the first butterfly valve 40 opens and closes, and the flow cross-sectional area of the opening 36 is increased or decreased only by the first butterfly valve 40.

[0020]

According to the present invention, the opening for dropping the spraying agent is divided into one and the other sections, and each section is opened and closed by the first and second butterfly valves, and the second butterfly valve is the switching means. By this, it is possible to switch between the fully closed position and the motion position linked to the operation member. Therefore, there are the following effects. (A) When performing a minute adjustment of the spraying flow rate, the first butterfly valve adjusts the flow cross-sectional area of only one section of the opening, which improves accuracy. (B) Instead of one large butterfly valve, two small butterfly valves increase or decrease the flow cross-sectional area of the opening, so that pressurized air flows from the lower side to the upper side due to the inclination of the butterfly valve at the time of opening. The difference between the maximum air pressure on the inflow side and the minimum air pressure on the non-inflow side is reduced, and the deviation of the remaining amount of the spraying agent on the upper side of the opening is reduced. It is possible to prevent the spraying flow rate of the agent from decreasing or fluctuating. (C) With the miniaturization of each butterfly valve, the height of the upper end of the butterfly valve at the maximum opening becomes lower, so a cover for covering the upper side of the butterfly valve and forming a stirring chamber with the butterfly valve The height of the power spreader can be reduced to reduce the height dimension of the power spreader. (D) In order to ensure a wide range of adjustment of the spray flow rate, the first
Also, when the flow cross-sectional area of the opening is increased or decreased by the second butterfly valve, compared to the case where the flow cross-sectional area of the opening is increased or decreased by one conventional butterfly valve, Below the opening (for example, when the rotation angle of the rotating shaft is about 45 ° or less), the distance between the edge of the butterfly valve and the opening surface in the direction perpendicular to the opening surface (= up-down direction) becomes small. It makes it possible to use the metered amount.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a metering device.

FIG. 2 is a plan view of the metering device.

FIG. 3 is a vertical sectional view of the metering device when the second butterfly valve is fixed in the fully closed position.

FIG. 4 is a plan view of a gear type switching unit when fixing the second butterfly valve to a fully closed position.

FIG. 5 is a perspective view of a protruding portion of a rotary shaft in the metering case.

FIG. 6 is a perspective view of a driven gear.

FIG. 7 is a vertical cross-sectional view of the metering device when the link-type switching means places the second butterfly valve in the moving position.

FIG. 8 is a vertical cross-sectional view of the metering device when the link-type switching means places the second butterfly valve in the fully closed position.

FIG. 9 is a vertical sectional view of the backpack power spreader.

[Explanation of symbols]

 10 backpack power sprayer (power spreader) 26 spraying agent 28 metering device 36 opening 40 first butterfly valve 42 second butterfly valve 86 gear type switching means (switching means) 102 link type switching means (switching means)

Claims (1)

(57) [Claims] 1. An opening (36) for supplying pressurized air from the lower side and dropping the spraying agent (26) on the upper side, and opening and closing one section of the opening (36) by operating an operating member. No. 1 butterfly valve (40), a second butterfly valve (42) capable of opening and closing the other section of the opening (36), the second butterfly valve (42) at the fully closed position and the operating member. And a switching means (86, 102) for switching to a movement position for opening and closing by the operation of.