JP2541353Y2 - Chemical sprayer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical spraying vehicle for traveling in a field and spraying a chemical, and more particularly, to a chemical spraying vehicle capable of achieving uniform spraying of a chemical regardless of running speed. .

[0002]

2. Description of the Related Art In a conventional chemical spraying vehicle that sprays a chemical while traveling in a field, a pump is configured to control the discharge pressure by a pressure regulating valve connected to a discharge side and to pump the chemical to a nozzle. I have.

Further, in a conventional chemical spraying vehicle, a plurality of nozzle pipes are arranged on the left and right, etc., a plurality of pumps of a multiple pump device have a common discharge port, and each nozzle pipe has a multiple pump. It is connected to a common discharge port of the device, and an on-off valve is provided for each nozzle pipe, so that only left-side spraying, only right-side spraying, and both-side spraying can be switched by operating the on-off valve. .

[0004]

The running speed of the chemical sprayer is changed depending on the condition of the field, the driver's preference, etc. In the conventional chemical sprayer, the discharge pressure of the pump is adjusted by a pressure regulating valve. As a result, it becomes constant irrespective of the traveling speed of the chemical sprayer, and the spray density of the chemical decreases as the traveling speed increases, and changes in relation to the traveling speed.

When the discharge pressure of the multiple pump device is made to be proportional to the traveling speed of the chemical spraying vehicle by using the multiple pump device, each pump of the multiple pump device may be used as in the prior art. When the chemical liquid is sent to each nozzle pipe from the common discharge port by making the discharge port common, the spray pressure of the nozzle increases as the number of nozzle pipes performing the chemical liquid spraying becomes smaller. However, since the spray flow rate from the nozzles increases, when the chemical solution is sprayed only from the nozzles of a specific nozzle pipe and not from all the nozzle pipes as in the case of pile ground spraying or fractional spraying, the spray density is not high. It will be uniform. Also, in order to avoid this and to prevent the spray pressure from the nozzles from changing even when the number of nozzle pipes for spraying the chemical liquid is changed, the operator drives the multiple pump device by a reduction gear or the like. Adjusting the speed complicates the operation.

In Japanese Utility Model Application No. 4-63874, the rotational speed of the drive shaft of the multiple pump device is made proportional to the rotational speed of the drive wheels for traveling, and the discharge sides of the respective pumps of the multiple pump device are mutually connected. As a non-communication, each nozzle pipe was individually connected to the discharge side of each pump, and the number of nozzle pipes for performing chemical solution spraying was switched while enabling or disabling chemical solution spraying for each nozzle pipe. In some cases, the spray pressure of the nozzle during spraying of the chemical solution is not changed. However, although the specification and drawings of Japanese Utility Model Application No. 4-63874 disclose a configuration in which the spray pressure of the nozzle is proportional to the traveling speed, it does not disclose a configuration in which the proportional constant is finely adjusted appropriately. .

[0007] The purpose of this invention is that of Japanese Utility Model Application No. 4-63874.
The present invention is to further improve the chemical spraying vehicle described in No. 1 by making the spray flow rate of the nozzle proportional to the running speed, and avoiding the change of the spray flow rate from the nozzles even if the number of nozzle groups during chemical spraying is changed. It is another object of the present invention to provide a chemical sprayer that can appropriately and finely adjust a proportional constant of a spray flow rate of a nozzle with respect to a traveling speed.

[0008]

The present invention will be described with reference to the drawings corresponding to the embodiments. The chemical sprayer (10, 36) of the present invention has the following components (a) to (g). (A) a transmission shaft (38) that rotates at a rotation speed proportional to the rotation speed of the traveling drive wheels (22, 28); (b) a plurality of discharge shafts (66a-c) whose discharge ports (66a-c) are not communicated with each other; Multiple reciprocating pumps equipped with reciprocating pumps (62a-c), each reciprocating pump (62a-c) being driven by a common crankshaft (52) and reciprocating a reciprocating member (68) to suck and discharge a chemical solution (86) Pump device (44) (c) Oscillating arm (50) for oscillating and reciprocatingly displacing the crankshaft (52) in the rotational direction (d) Oscillatingly adjusting the connecting position in the radial direction of the crankshaft (52) The swing arm (5) is connected to the arm (50) and driven by the transmission shaft (38) at a swing frequency proportional to the rotation speed of the transmission shaft (38).
(E) each of which has a plurality of nozzles (92) and discharge ports (66a-c) of each reciprocating pump (62a-c) of the multiple reciprocating pump device (44) A plurality of nozzle groups (90a-c) that are individually connected to each other to guide the chemical (86) from the discharge ports (66a-c) in a non-pressure-controlled state; (f) each reciprocating pump (62a-c) and each nozzle On-off valves (96a-c) that individually control the connection with the groups (90a-c) (g) Open with a liquid pressure greater than the spray pressure of the nozzle (92) and discharge the reciprocating pumps (62a-c). Relief valve (100a-c) for releasing chemical solution (86) at outlet (66a-c)

[0009]

[Action] In the chemical sprayer (10, 36), the transmission shaft (38)
The link means (60) is driven by rotating at a rotation speed proportional to the rotation speed of the traveling drive wheels (22, 28). Swing arm (50)
Are driven by the driving of the link means (60).
Swings at a swing frequency proportional to the rotational speed of the multiple reciprocating pump device (44) to reciprocate the crankshaft (52) in the rotating direction. The reciprocating member (68) of the reciprocating pumps (62a-c) reciprocates with the reciprocating displacement of the crankshaft (52) in the rotation direction, and each reciprocating pump (62a-c) has a driving wheel ( The chemical liquid (86) is discharged to the discharge ports (66a-c) at a flow rate proportional to the rotation speed of the chemical liquid spray vehicle (10, 36).

In order to change the proportional constant of the spray flow rate of the chemical liquid (86) from the nozzle (92) with respect to the traveling speed of the chemical liquid sprayer (10, 36), the link means (60) to the swing arm (50) Change the connection position of. As a result, the swing stroke of the swing arm (50) changes, and the amount of reciprocal displacement of the crankshaft (52) in the rotational direction, and therefore the reciprocating members (6) of the reciprocating pumps (62a-c),
The stroke of 8) changes, and the discharge flow rate of the chemical solution (86) to the discharge ports (66a-c) of the reciprocating pumps (62a-c) changes.

The chemical liquid (86) from the discharge port (66a-c) of the reciprocating pump (62a-c) with the open / close valve (96a-c) open is not regulated by the pressure regulating valve. Nozzle group corresponding to pressure regulation
(90a-c), and is ejected from each nozzle (92) of the nozzle group (90a-c). The relief valve (100a-c) is a reciprocating pump (62a-
When the discharge port (66a-c) of c) has the spray pressure of the nozzle (92), it is kept closed. In this way, the spray flow rate of the nozzle (92) is changed to the nozzle group (90a-c) performing the spraying of the chemical solution (86).
Irrespective of the number of pieces, the number increases as the traveling speed of the chemical sprayer (10, 36) increases.

The discharge port (66a-c) of the reciprocating pump (62a-c) with the on-off valve (96a-c) closed is connected to the corresponding nozzle group.
Since the injection of the chemical solution (86) from the nozzle (92) of (90a-c) is prevented, the pressure becomes high. This allows the relief valve (100a-c)
Is opened to release the chemical solution (86) from the discharge port (66a-c) of the reciprocating pump (62a-c).

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 3 is a configuration diagram of a power transmission system of the rice transplanter cart 10. The rotational power of the engine 12 is transmitted to a transmission 18 via a traveling clutch 16 which is disengaged or engaged by a manual or stepping operation of a clutch lever 14, and further transmitted from the transmission 18 to a front differential device 20, and It is distributed from the differential device 20 to the left and right front wheels 22. The rotational power transmitted to the front differential device 20 is transmitted to a rear differential device 26 via a propeller shaft 24, and is transmitted from the rear differential device 26 to the left and right rear wheels.
Distributed to 28. The output of the transmission 18 is also transmitted via a PTO shaft clutch 30 to a PTO shaft 32 at the rear end of the rice transplanter cart 10.
Is transmitted to The rice transplanter cart 10 has a planting device removed from the rice transplanter, and is instead equipped with a chemical sprayer 36 (FIG. 1). A universal shaft 34 has a front end and a rear end of a PTO shaft 32. And the rotational power of the PTO shaft 32 is transmitted to the chemical sprayer 36.

FIG. 2 is a diagram showing the triple piston pump device 44 of the chemical sprayer 36 together with a power transmission system from the PTO shaft 32 to the triple piston pump device 44. The transmission shaft 38 of the chemical sprayer 36 has a front end connected to the rear end of the universal shaft 34 so as to be separable, and rotational power is transmitted from the PTO shaft 32 via the universal shaft 34. The rotating arm 40 is integrally and rotationally fixed to the rear end of the transmission shaft 38 at the base end, and rotates the distal end side at a predetermined radius with the rotation of the transmission shaft 38. One end of the link rod 42 is rotatably connected to the tip of the rotary arm 40, and reciprocates in the left-right direction with the rotation of the rotary arm 40. The triple piston pump device 44 includes a crankcase 46 and a pump
The swing arm 50 has an elongated hole 54 extending integrally with the exposed end of the crankshaft 52 of the crankcase portion 46 at the base end and extending in the longitudinal direction at the tip end. I have. The end of the link rod 42 on the side of the swing arm 50 is bent at a right angle, and the bush 56 is fitted therein, and then inserted into the elongated hole 54 together with the bush 56 so as to be displaceable in the length direction of the elongated hole 54. ing. The thumbscrew 58 is screwed onto the outer peripheral side of the bush 56 so that the bent end of the link rod 42 is rotatably held through the bush 56, and the bush 56 is positioned at any position in the length direction of the slot 54. Is fixed to the swing arm 50. Link mechanism
60 comprises a rotating arm 40 and a link rod 42,
A swing arm with a swing frequency proportional to the rotation speed of the transmission shaft 38
Swing 50.

FIG. 4 is a detailed horizontal sectional view of the triple piston pump device 44. The triple piston pump device 44 includes three piston pumps driven by a common crankshaft 52.
62a-c, and the piston pumps 62a-c
And discharge ports 66a-c which are not communicated with each other. Each of the piston pumps 62a-c has the same structure. In the embodiment, the phases are at 120 ° crank angle intervals, but may be the same phase. In each of the piston pumps 62a-c, the piston rod 68 is connected to the crankshaft 52 on the base end side, and reciprocates with the rotation of the crankshaft 52. Valve body
The stopper 70 with the through hole and the stopper 72 with the through hole are separated in the axial direction of the piston rod 68 so that the stopper 72 with the through hole is on the distal end side of the valve body 70, and the axial position is fixed to the distal end of the piston rod 68. Attached. The valve seat 74 is loosely fitted to the piston rod 68 between the valve body 70 and the stopper 72 with a through hole, and cooperates with the valve body 70 to form a suction valve 78. The piston packing 76 is fitted on the outer peripheral side of the valve seat 74, and slides on the cylindrical wall surface of the pump chamber 80 on the outer peripheral side to seal the pump chamber 80.

FIG. 1 is a system diagram of the chemical 86 in the chemical sprayer 36. The chemical liquid tank 84 stores a chemical liquid 86 and a suction pipe 88.
Connects the bottom of the chemical tank 84 to the suction port 64 of the triple piston pump device 44. The nozzle pipes 90a-c are respectively disposed on the left, center and right sides of the chemical sprayer 36, extend in the left-right horizontal direction, and extend at equal intervals in the longitudinal direction.
Is provided downward. The discharge pipes 94a-c connect the discharge ports 66a-c of the piston pumps 62a-c to the nozzle pipes 90a-c, and the open / close cocks 96a-c are connected to the discharge pipes 94a-c near the nozzle pipe 90a-c. To open and close the discharge pipes 94a-c. The return pipe 98a-c is connected to the discharge pipe 94a on the side of the triple piston pump device 44 from the open / close cock 96a-c on the upstream end side.
It branches off from the location of -c, merges at the downstream end side, and reaches the upper part of the chemical solution tank 84. The relief valves 100a-c are disposed in the return pipes 98a-c, respectively, and open the discharge pipes 94a-c when a pressure greater than the spray pressure in the nozzle 92 is received from the discharge pipes 94a-c.

The operation of the embodiment will be described. When the traveling clutch 16 and the PTO shaft clutch 30 are brought into contact with each other, the rotational power of the engine 12 is transmitted to the front wheels 22, the rear wheels 28, and the transmission shaft 38, so that the rice transplanter truck 10 travels and the chemical sprayer is used. The 36 transmission shafts 38 rotate. The rotation speed of the engine 12 and the rotation speeds of the front wheels 22 and the rear wheels 28
Since the rotation speed of the transmission shaft 38 is proportional to the rotation speed of the transmission shaft 38, the rotation speeds of the front wheel 22 and the rear wheel 28, that is, the traveling speed of the rice transplanter bogie 10 and the rotation speed of the transmission shaft 38 are mutually proportional. Become a relationship. The rotary arm 40 rotates integrally with the transmission shaft 38, reciprocates the link rod 42 of the link mechanism 60 at a frequency proportional to the rotation speed of the transmission shaft 38, and passes through the link mechanism 60 at the same frequency. The swing arm 50 is swung.
The crankshaft 52 of the triple piston pump device 44 reciprocates in the rotational direction within a rotation angle of 180 ° or less with the swing of the swing arm 50. As a result, each of the triple piston pump devices 44 The piston rods 68 of the piston pumps 62a-c reciprocate to increase or decrease the volume of the pump chamber 80. The frequency of the reciprocating motion of the piston rod 68 is proportional to the frequency of the reciprocating displacement in the rotational direction of the crankshaft 52, and therefore the rotational speed of the front wheel 22 and the rear wheel 28, and as a result, the discharge ports 66a- of each piston pump 62a-c. c is a chemical solution at a flow rate proportional to the rotation speed of the front wheels 22 and the rear wheels 28
86 is discharged.

Nozzle for running speed of truck 10 for rice transplanter
To change the proportionality constant of the spray flow rate of the chemical solution 86 from 92, loosen the thumb screw 58, move the bush 56 along the elongated hole 54, change the bush 56 to the desired position, and then change the thumb screw.
Tighten 58 again to secure bush 56. As a result, the swing stroke of the swing arm 50 changes, and the amount of reciprocal displacement of the crankshaft 52 in the rotation direction, and therefore, the stroke of the piston rod 68 of the piston pumps 62a-c changes.
The discharge flow rate of the chemical solution 86 to each of the discharge ports 66a-c of the piston pumps 62a-c changes.

The chemical liquid 86 from the discharge ports 66a-c of the piston pumps 62a-c having the open / close cocks 96a-c open is not adjusted by the pressure adjusting valve, and the corresponding nozzle remains in a non-pressure adjusted state. Sent to pipe 90a-c, each nozzle of nozzle pipe 90a-c
Injected from 92. The relief valves 100a-c are kept closed when the discharge ports 66a-c of the piston pumps 62a-c are at the spray pressure of the nozzle 92. Thus, the spray flow rate of the nozzle 92 is proportional to the rotation speed of the front wheel 22 and the rear wheel 28, and increases as the traveling speed of the rice transplanter cart 10 increases.

The chemical liquid 86 from the discharge ports 66a-c of the piston pumps 62a-c having the open / close cocks 96a-c closed is supplied to the nozzle 92
Since the injection from the nozzle is prevented, the pressure becomes high. As a result, the relief valves 100a-c open, and the discharge lines 94a-c
The chemical solution 86 in the inside is returned to the chemical solution tank 84.

In the embodiment, the chemical sprayer 36 is a cart for rice transplanters.
The chemical sprayer is mounted on 10 and constitutes a chemical sprayer, but the chemical sprayer 36 is mounted on a self-propelled trolley other than the rice transplanter trolley 10, or the chemical sprayer 36 itself is configured as a self-propelled vehicle. Is also good.

[0022]

According to the present invention, the link means swings the swing arm at a frequency proportional to the rotation speed of the driving wheel of the chemical sprayer, and in the multiple reciprocating pump device, each reciprocating pump has
The discharge ports are individually provided in a non-communicating state, and the reciprocating member is reciprocated by reciprocating displacement in the rotation direction of the common crankshaft,
A chemical solution is pressure-fed from each discharge port to a nozzle group, and each open / close valve is individually opened / closed to individually control the connection between the discharge port of each reciprocating pump and each nozzle group. Therefore, it is possible to make the spray flow rate of the chemical solution from the nozzles proportional to the traveling speed of the chemical sprayer while keeping the spray flow rate of the chemical solution constant irrespective of the number of nozzle groups performing spraying.

In this invention, the stroke of the reciprocating member of the reciprocating pump changes by adjusting the connecting position of the link means to the swing arm in the radial direction of the crankshaft.
This makes it possible to finely adjust the proportional constant of the spray flow rate of the chemical solution of the nozzle with respect to the traveling speed of the chemical sprayer.

[Brief description of the drawings]

FIG. 1 is a system diagram of a chemical in a chemical sprayer.

FIG. 2 shows a three-piston pump device of a chemical sprayer with PTO.
It is a figure shown with a power transmission system from a shaft to a triple piston pump device.

FIG. 3 is a configuration diagram of a power transmission system of the rice transplanter cart.

FIG. 4 is a detailed horizontal sectional view of the triple piston pump device.

[Explanation of symbols]

Reference Signs List 10 Cartridge for rice transplanter (chemical sprayer) 22 Front wheel (drive wheel for running) 28 Rear wheel (drive wheel for run) 36 Chemical sprayer (chemical sprayer) 38 Transmission shaft 44 Triple piston pump device (multiple reciprocating pump) 50) swing arm 52 crankshaft 60 link mechanism (link means) 62a-c piston pump (reciprocating pump) 66a-c discharge port 68 piston rod (reciprocating member) 86 chemical solution 90a-c nozzle pipe (nozzle group) 92 Nozzle 96a-c on-off cock (on-off valve) 100a-c relief valve

Claims (1)

(57) [Scope of request for utility model registration] A transmission shaft (38) rotating at a rotation speed proportional to a rotation speed of the traveling drive wheels (22, 28), and discharge ports (66a-c).
Are reciprocating pumps (62a-
c) each reciprocating pump (62a-c) has a common crankshaft (52)
And a multiple reciprocating pump device (44) that sucks and discharges the chemical solution (86) by reciprocating motion of the reciprocating member (68), and a rocking device that rocks and reciprocates the crankshaft (52) in the rotational direction. The moving arm (50) is connected to the swing arm (50) so that the connecting position in the radial direction of the crankshaft (52) can be adjusted, and is connected to the swing arm (50) and is driven by the transmission shaft (38). Link means (60) for swinging the swing arm (50) at a swing frequency proportional to the rotation speed, and each of the multiple reciprocating pump devices (44) including a plurality of nozzles (92). A plurality of nozzle groups each of which is individually connected to the discharge port (66a-c) of the reciprocating pump (62a-c) and guides the chemical (86) from the discharge port (66a-c) in a non-pressure-controlled state ( 90a-c), an on-off valve (96a-c) for individually controlling the connection between each of the reciprocating pumps (62a-c) and each of the nozzle groups (90a-c),
The chemical liquid at the discharge port (66a-c) of each of the reciprocating pumps (62a-c) is opened at a liquid pressure greater than the spray pressure of the nozzle (92).
A chemical sprayer having a relief valve (100a-c) for releasing (86).