JPH0450917Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a shutter device for a backpack power spreader that is carried on the back of a worker and used to spray a powdery spray agent on a field.

[Prior art] A backpack power spreader used to spread powdery spraying agents on a field has a shutter disposed at the bottom of a storage tank that stores the powdery spraying agent inside, and the opening degree of the shutter is By adjusting the amount, the amount of powdery dispersing agent discharged from the storage tank, that is, the amount of spraying is adjusted.

In a conventional shutter device, a shutter lever as an operating member and a scale plate with tooth grooves for locking the shutter lever are arranged on the side of the backpack power spreader, and a link arm that can rotate integrally with the shutter shaft of the shutter is located in the middle. It is connected to a shutter lever via a link system including a rod and a universal joint, and in order to obtain the desired amount of spray, the operator operates the shutter lever and locks the shutter lever in a predetermined tooth space on a scale plate.

[Problems to be solved by the invention] Problems with the shutter device of the conventional backpack power spreader are enumerated as follows.

(a) Since a link system is used, it is not possible to use a boosting mechanism other than the lever ratio, and in order to keep the shutter at a constant opening, the shutter lever must be moved against the spring force of the shutter lever to move the scale plate. It must be fixed in the tooth groove, which increases the operating force.

(b) Since a link system is used, the shutter lever's mounting position is restricted by the shutter's opening/closing direction and the universal joint, making it close to the machine, resulting in poor operability. In addition, in order to improve operability, when extending the shutter lever forward and moving the scale plate forward, they will be in a position that extends beyond the machine, making it difficult for workers to carry the power spreader on their backs. These may become obstacles or the packaging for shipping from the factory may become bulky, making it uneconomical.

(c) Engine vibrations are transmitted to the shutter lever via the link system, causing discomfort to the operator during operation and accelerating wear of the tooth grooves on the scale plate. In addition, it is uneconomical to change the material, structure, and dimensions to be more resistant to vibrations, and if anti-vibration rubber is used in the link system to prevent vibrations, the shutter may open due to the bending of the rubber, causing the dust to spread. The agent may leak and become dangerous.

The purpose of this invention is to provide a shutter device for a backpack power spreader that can solve the above-mentioned problems of the prior art.

[Means for Solving the Problems] According to the shutter device of the backpack power spreader of this invention, an adjustment member for adjusting the opening degree of the shutter is provided near the shutter disposed at the bottom of the storage tank, and an adjustment member for adjusting the shutter operation is provided. A hydraulic actuating member connected to the shaft is disposed, and an operating side hydraulic cylinder of the operating member is communicated with the side edge of this actuating member via a conduit, and the operating member opens and closes the shutter to an appropriate opening degree. possible.

[Operation] The operator operates the operating member to open the shutter. Accordingly, a predetermined hydraulic pressure is generated within the operating member, and this hydraulic pressure is transmitted to the operating member via the conduit. The actuating member moves until limited by the adjusting member, thereby opening the shutter to the opening determined by the adjusting member.

[Example] Hereinafter, this invention will be described with reference to an example of the drawings.

FIG. 10 is a front sectional view of the backpack power spreader 10, which is used as a power working machine for spraying a powdery spray agent on a field, and is carried on the back of a worker. The lower fan case 12 accommodates the blower 14 therein, and the discharge case 16 is inserted into the fan case 12 from the upper opening of the fan case 12, and the upper peripheral edge is fitted into the upper peripheral edge of the fan case 12. ing. Discharge case 16
has an outlet 20 that communicates with a discharge port of the blower 14 via a discharge pipe 18, and a pressurization port 22 into which a portion of the pressurized air from the blower 14 is introduced. The shutter case 24 is fitted into the upper periphery of the fan case 12 with its lower periphery placed on the upper surface of the upper periphery of the discharge case 16 with a packing 26 interposed therebetween. Pressurized air passage 27
is formed between the discharge case 16 and the shutter case 24 and allows the pressurizing port 22 to communicate with the upper central opening of the shutter case 24. A shutter 28 consisting of a butterfly valve is disposed at the upper center opening of the shutter case 24 to open and close it, and a shutter shaft 30 as an operating shaft has both ends pivotally supported by the shutter case 24 and is oriented relative to the center line of the shutter 28. The shutter 28 is biased toward the pressurized air passage 27 by the screw 32.
is integrally fixed to. The shutter shaft 30 rotates counterclockwise in the figure to open the shutter 28. Therefore, the flow cross-sectional area of the spraying agent delivery opening 33b is larger than that of the pressurized air introduction opening 33a, and in its open position, the shutter 28 is lowered on the side of the pressurized air introduction opening 33a, and the spraying agent is It rises on the side of the delivery opening 33b. The stud bolts 34, 34 are erected around the upper surface side of the shutter case 24, and the shutter cover 36 is fixed to the stud bolts 34, 34 by hitting the upper steps of the stud bolts 34, 34 at both ends. It covers the upper part of 28. The storage tank 38 is fitted at its lower end to the upper outer periphery of the shutter case 24, clamps the packing 40 to the stepped portion of the shutter case 24, and stores the spraying agent therein.

The pressurized air generated as the blower 14 rotates,
The pressurized air passage 27 extends from the pressurizing port 22 to the center of the shutter case 24 . Since the shutter 28 is downward on the pressurized air introduction opening 33a side, the pressurized air collides with the portion of the shutter 28 on the pressurized air introduction opening 33a side and rises along the upper surface of the shutter 28. Then, the powdery spraying agent existing between the shutter 28 and the shutter cover 36 is stirred, and the stirred spraying agent is sent out to the spraying agent delivery opening 3 of the shutter 28.
Go over the edge on the 3b side and proceed toward the exit 20.
Since the spray agent stirred and delivered by the pressurized air is sent out from the spray agent delivery opening 33b toward the outlet 20, uneven discharge is prevented. In addition, since the shutter shaft 30 is biased toward the pressurized air introduction opening 33a, when the shutter 28 is opened with respect to an opening of a certain size in the upper center of the shutter case 24 in which the shutter 28 is disposed. Since the flow cross-sectional area of the dispersing agent delivery opening 33b becomes larger, the maximum discharge amount of the dispersing agent increases.

FIG. 1 shows the operating mechanism of the shutter.
The link arm 48 is connected to the shutter shaft 3 at one end.
0 and rotates integrally with the shutter shaft 30. Operating side hydraulic cylinder 50 as an operating member
has a shaft 52 rotatably supported by the machine at its lower end, and a piston rod 54 that can extend upward. Piston rod 54 is rotatably connected to the other end of link arm 48 via pin 56. The stay 58 is fixed to the machine above the operating hydraulic cylinder 50, and an adjustment dial 60, which is an adjustment member made of a bolt, is screwed onto the stay 58, and has a head on which adjustment scales are written, and a link arm. The link arm 4 comes into contact with the side edge of 48.
It has a lower end that functions as a stopper 62 that limits the rotation range of 8. FIG. 2 is a schematic diagram showing the positions of the operating side hydraulic cylinder 50 and the like on the back side of the backpack power spreader 10.

Returning to FIG. 1, the operating lever 64 as an operating member has parts 6 that are rotatable with respect to each other via a pin 66.
8,70. Operation side hydraulic cylinder 7
2 has a piston rod 74 extendable towards part 70 and fixed to part 68 of operating lever 64. The lower end of the piston rod 74 is a portion 70
is in contact with. The pipe line 76 communicates the respective oil chambers of the operating side hydraulic cylinder 50 and the operating side hydraulic cylinder 72 with each other.

FIG. 3 is a sectional view of the working hydraulic cylinder 50. The operating side hydraulic cylinder 50 has an oil chamber 78 inside.
a cylinder body 80 that partitions the cylinder body 80; a piston 82 that slides within the cylinder body 80 and is coupled to the piston rod 54; an O-ring 84 that fits into an annular groove on the outer periphery of the piston 82; 82 toward the oil chamber 78.

FIG. 4 is a sectional view of the operating side hydraulic cylinder 72. The operation side hydraulic cylinder 72 has an oil chamber 88 inside.
It has a cylinder body 90 that partitions the cylinder body 90, a piston 92 that is slid in the cylinder body 90 and is coupled to the piston rod 74, and an O-ring 94 that is fitted into an annular groove on the outer periphery of the piston 92. There is.

The operation of the embodiment will be explained. Shatter 28
The position of the stopper 62 of the adjustment dial 60 is adjusted in advance by turning the adjustment dial 60 so that the degree of opening when opened is a predetermined value. The worker is
When opening the shutter 28, the portions 68, 70 of the operating lever 64 are tightened together. As a result, the piston rod 74 of the operating hydraulic cylinder 72 is pushed into the cylinder body 90, the volume of the oil chamber 88 is reduced, and oil pressure is generated within the operating hydraulic cylinder 72. This oil pressure is transmitted to the oil chamber 78 of the working hydraulic cylinder 50 through a pipe 79, and the piston rod 54 of the working hydraulic cylinder 50 extends upward. As a result, the link arm 48 rotates until its upper side edge contacts the stopper 62 of the adjustment dial 60, and the shutter 28 is opened (solid line). When the operator presses the parts 68 and 7 of the operating lever 64
When the tightening of 0 is stopped, the operating hydraulic cylinder 5
The piston rod 54 is retracted into the cylinder body 80 by the compression coil spring 86 in the cylinder 80, and the link arm 48 is thus rotated in a direction away from the stopper 62, and the shutter 28 is closed (as shown by the broken line). Further, the piston rod 74 of the operating side hydraulic cylinder 72 is connected to the oil chamber 78 of the operating side hydraulic cylinder 50.
The portions 68, 70 of the operating lever 64 return to their original open state.

FIG. 5 shows another embodiment of the operating hydraulic cylinder 72. As shown in FIG. In this operating side hydraulic cylinder 72, a chamber case 96 is fixed to the cylinder body 90. A space within the chamber case 96 communicates with the oil chamber 88, and an air chamber 98 is formed within the chamber case 96. As the oil pressure in the oil chamber 88 increases, the air chamber 98
Since the volume of is reduced, the hydraulic pressure is prevented from becoming excessive. By suppressing the rise in oil pressure by the air chamber 98, it is possible to avoid excessive force from being applied to the abutment portion between the link arm 48 and the stopper 62, and as a result, damage to parts can be prevented.

FIG. 6 is a perspective view of a modification of the operating lever 64. A U-shaped catch 100 is pivotally coupled to the free end of portion 70. In order to open the shutter 28, the parts 68 and 70 of the operating lever 64 are tightened together, and at the same time as the tightening, the locking tool 100 is rotated to fit the portion 68 into the locking tool 100.
The center portion of the locking device 100 is locked to the outer surface of the portion 68. This prevents the portions 68, 70 from opening even after the operator has stopped tightening, so the shutter 28 remains open.

FIG. 7 shows yet another modification of the operating lever 64. A clip 102 is secured to the outer surface of portion 70. The clip 102 may be clipped, for example, to a waistband 104 of the backpack power spreader 10 at a suitable location.

FIG. 8 shows a modification of the stay 58. The stay 58b includes an L-shaped portion 108 that is fixed to the machine and has an elongated hole 106 drilled in the radial direction of the shutter shaft 30, a set screw 110 that is fitted so as to be able to be displaced inside the elongated hole 106, and the tip of the L-shaped portion 108. A belt portion 116 is fixed to the L-shaped portion 108 by a nut 112 screwed into the band portion 116 and has a screw hole 114 into which the adjustment dial 60 is screwed. Since the position of the band portion 116, that is, the stopper 62 of the adjustment dial 60, can be adjusted in the radial direction of the shutter shaft 30 of the link arm 48, the opening degree of the shutter shaft 28 can be adjusted more finely.

FIG. 9 shows yet another modification of the stay 58. The stay 58c fixed to the machine has a plurality of screw holes 118 in which the adjustment dial 60 can be selectively screwed in in the radial direction of the shutter shaft 30. are formed at appropriate intervals. In this example as well, by selecting the screw hole 118 into which the adjustment dial 60 is screwed, the position of the stopper 62 of the adjustment dial 60 can be adjusted in the radial direction of the shutter shaft 30, and the opening degree of the shutter 28 can be finely adjusted. can do.

Above I explained about the butterfly valve type shutter.
It can also be used for sliding valve type shutters as well.

[Effects of the invention] As described above, according to this invention, the operating force of the operating member is transmitted to the operating member via hydraulic pressure. Therefore, by appropriately selecting the dimensions of the actuating member and each part of the actuating member, the actuating force of the actuating member can be increased relative to the actuating force of the actuating member based on Pascal's principle. Furthermore, since there is no need to attach the operating member by extending it out from the machine, it is possible to eliminate problems when carrying or packing the backpack power spreader. Furthermore, the operating member can be separated from the machine, preventing engine vibrations from being transmitted to the operating member, thereby eliminating operator discomfort and wear caused by vibration.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; Fig. 1 is a diagram showing the operating mechanism of the shutter, Fig. 2 is a schematic diagram showing the position of the operating side hydraulic cylinder etc. on the back of the backpack power spreader, and Fig. 3 is a diagram showing the operating mechanism of the shutter. 4 is a sectional view of the operating hydraulic cylinder, FIG. 5 is a diagram showing another embodiment of the operating hydraulic cylinder, FIG. 6 is a perspective view of a modification of the operating lever, 7th
Figure 8 shows another modification of the operating lever, Figure 8 shows a modification of the stay, Figure 9 shows another modification of the stay, and Figure 10 shows a backpack power spreader. FIG. 10... Backpack power spreader, 28... Shutter,
30... Shutter shaft (operating shaft), 38... Storage tank, 50... Operating side hydraulic cylinder (operating member),
60...adjustment dial (adjustment member), 64...operation lever (operation member), 76...pipe line.

Claims (1)

[Scope of claim for utility model registration] (1) Shutter 2 disposed at the bottom of storage tank 38
An adjusting member 60 for adjusting the opening degree of the shutter 28 and a hydraulic actuating member 50 connected to the actuating shaft 30 of the shutter 28 are disposed near the shutter 28, and a conduit 76 is connected to the side edge of the actuating member 50. The operation side hydraulic cylinder 72 of the operation member 64 is communicated through the
A shutter device for a backpack power spreader, characterized in that the operating member 64 allows the shutter 28 to be opened and closed to an appropriate opening degree. (2) A utility model according to claim 1, characterized in that a locking device 100 is provided to prevent the operating member 64 from returning and to maintain the operating position of the operating member 64. Shutter device for backpack power spreader. (3) The adjustment member 60 has a stopper 62 that comes into contact with the link arm 48 that rotates integrally with the operating shaft 30 to limit its swing range, and is adjustable in position in the radial direction of the operating shaft 30. Scope of claim for utility model registration (1) characterized by
A shutter device for a backpack power spreader as described in paragraph (2). (4) The shutter device for a backpack power spreader according to any one of claims 1 to 3, wherein the operating member 64 is provided with a clip 102.