JP3150159B2 - Backpack power sprayer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation mechanism of a discharge pressure control valve and an accelerator control device in a backpack type power sprayer for disinfecting while walking between crops while an operator is carrying on his back.

[0002]

2. Description of the Related Art Conventionally, a technology related to a backpack type power sprayer which is equipped with a power sprayer and an engine and which can be carried by an operator on the back is known. However, in the conventional backpack type power sprayer,
The operation of the discharge pressure adjusting valve of the power atomizer is performed by one handle, and the accelerator adjusting device of the engine is operated by another handle.

[0003]

Therefore, in the conventional backpack type power atomizer, when the discharge pressure is to be reduced by the discharge pressure adjusting valve, such as when the spray pressure is too high, the discharge pressure adjusting lever is operated. If the rotation speed of the engine E is lowered, and if the rotation speed of the engine E is high, the discharge pressure is not sufficiently reduced. Therefore, it is necessary to perform a double operation in which the rotation speed is also reduced by the accelerator adjustment lever. It is. Conversely, when attempting to increase the spray pressure by increasing the discharge pressure, the parallel operation of operating the discharge pressure adjusting lever to the pressure increasing side and simultaneously operating the rotation speed to the increasing side by the accelerator adjusting lever is performed. It was. In order to eliminate such a double operation of operating the discharge pressure adjusting lever and operating the accelerator adjusting lever in the same direction, the present invention uses a single lever to operate the discharge pressure adjusting valve 4 and the accelerator. Both of the adjusting devices are simultaneously operated in the same direction of height.

[0004]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.
In a backpack type power sprayer equipped with an engine E and a power sprayer, a discharge pressure adjusting valve 4 for adjusting the level of the discharge pressure of the power sprayer, and an urging spring 3 for pressing the discharge pressure adjusting valve 4;
An accelerator adjustment wire 1 for adjusting the level of the number of revolutions of the engine E is provided, and an adjustment handle 2 for rotating and adjusting the operator E is provided at a position where the operator can operate it while carrying on his back. An inner diameter screw portion is provided, and further, a cam surface is provided at an outer peripheral position of the inner diameter screw portion,
Either the urging spring 3 of the discharge pressure adjusting valve 4 or the accelerator adjusting wire 1 is provided on the inner screw portion and the cam surface.
, The level of the discharge pressure and the level of the engine speed can be simultaneously operated in parallel by rotating one adjustment handle 2.

[0005]

Next, the operation of the present invention will be described. That is, it is necessary to change the discharge pressure when the crop to be controlled is changed, or when the chemical solution is once sprayed and then the remaining chemical solution is sprayed again. In this case, when the handle 2 is rotated, the urging spring of the discharge pressure adjusting valve 4 is loosened, and the setting of the discharge pressure adjusting valve 4 is changed to a low pressure side. It is shifted to the side. Therefore, the discharge pressure can be simultaneously reduced from the two surfaces, that is, the discharge pressure regulating valve 4 and the decrease in the engine speed. Conversely, even when increasing the discharge pressure,
Since the discharge pressure can be increased from the discharge pressure adjusting valve 4 and the engine rotation speed, the operator can change the discharge pressure up and down with only one operation point. It was.

[0006]

Next, embodiments of the present invention will be described. FIG. 1 is a rear view of a backpack type power sprayer of the present invention, FIG.
FIG. 3 is a rear cross-sectional view of the adjustment handle 2 and the discharge pressure adjustment valve 4 of the present invention, and FIG. 4 is a rear cross-sectional view showing another embodiment of the present invention. 1 and 2 will be described. The body frame of the backpack type power sprayer and the chemical tank 19 are integrally formed of resin. The chemical liquid tank 19 is covered with a chemical liquid tank lid 20. The engine E is mounted on the integrally molded frame portion, and the fuel tank 22 is mounted on the lower portion of the rear surface of the engine E. Further, a power sprayer P is disposed at a position between the body frame and the engine E so as to directly connect to the crankshaft of the engine E to reciprocate the piston rod 13 and the piston 12.

[0007] The engine E is provided with a starting handle 23, and a fuel stop lever 18 is provided at a position where the operator carrying the backpack type power sprayer can operate with his left hand. An accelerator adjustment wire 1 of the engine E extends to the adjustment handle 2 separately from the fuel stop lever 18. In the present invention, both the discharge pressure adjusting valve 4 and the accelerator adjusting device can be operated in parallel by the adjusting handle 2 arranged at a position operable by the operator with the left hand.

Next, a first embodiment will be described with reference to FIG. In FIG. 3, a portion of the piston rod 13 and the piston 12 in the power sprayer P is shown in a sectional view, and a portion of the crankshaft of the engine E is not shown. The piston rod 13 reciprocates the piston 12, and the chemical in the chemical tank 19 is sucked from the chemical inlet 25. The drug solution from the drug solution inlet 25 is sucked by the suction valve 5 together with the retraction of the piston 12,
The suction valve 5 is closed by the protruding movement of the chemical liquid, and the chemical liquid which has been converted into the pressure liquid pushes and opens the discharge valve 27, and the chemical liquid discharge port 2 is opened.
1 is discharged. A discharge pressure adjusting valve 4 is disposed in a circuit portion from the discharge valve 27 to the chemical solution discharge port 21, and the discharge pressure is adjusted by changing the urging force of the urging spring 3 pressing the discharge pressure adjusting valve 4. The pressure of the regulating valve 4 changes. The discharge pressure adjusting valve 4 is pushed open to discharge the pressure chemical, and returns to the chemical tank 19, so that the discharge pressure is determined by the force of the urging spring 3. The biasing spring 3 is adjusted by pressing the spring pressure adjusting rod 15. The position of the cam surface 16 is rotated by the rotation of the adjusting handle 2, and the position of the spring pressure adjusting rod 15 is adjusted. It is configured to be moved.

The rotation of the adjusting handle 2 causes the cam surface 1 to rotate.
6, the spring pressure adjusting rod 15 slides left and right,
Since the urging force of the urging spring 3 is changed, the discharge pressure of the discharge pressure adjusting valve 4 changes. An inner diameter screw portion 17 is formed at the rotation center position of the adjustment handle 2,
The thread portion of the wire end locking body 8 is screwed into the inner thread portion 17. A biasing spring 9 is interposed in the wire end locking member 8. When the wire end locking member 8 moves left and right by rotation of the inner diameter screw portion 17, the biasing spring 9 moves left and right. Accelerator adjustment wire 1 locked by biasing spring 9
Is finely adjusted left and right. Fine adjustment of the accelerator adjustment wire 1 to the left and right changes the rotation speed of the engine E.

Next, FIG. 4 which is a second embodiment will be described. In FIG. 4, the configuration up to the adjustment handle 2 is the same, but the operation part of the discharge pressure adjustment valve 4 and the accelerator adjustment wire 1 is slightly different. That is, the position of the center of rotation of the control handle 2, a spring pressure adjusting rod 14 is arranged, the inner diameter screw of the spring pressure adjusting rod 14 is adjusted handle 2
The spring pressure adjusting rod 14 is configured to move left and right by screwing movement between the child part 11 and the outer diameter screw part 10 on the power sprayer P side. In the same manner, the biasing force of the biasing spring 3 is changed by the lateral movement of the spring pressure adjusting rod 14, and the discharge pressure of the discharge pressure adjusting valve 4 is adjusted. A cam surface 6 is formed on the boss portion of the adjustment handle 2, and the cam surface 6 moves the end of the wire end locking body 8 right and left via the ball 7. An urging spring 9 is interposed between the wire end stopper 8 and the outer part of the accelerator adjustment wire 1. Therefore, the rotation of the adjustment handle 2 causes the wire end locking member 8 to rotate.
Is moved left and right, the inner wire of the accelerator adjustment wire 1 moves left and right together with the wire end stopper 8,
It adjusts the accelerator adjuster and changes the speed.

[0011]

As described above, the present invention has the following advantages. First, both the discharge pressure adjusting valve 4 and the accelerator adjusting device can be simultaneously adjusted by rotating one adjusting handle 2, so that both the discharge pressure adjusting lever and the accelerator adjusting lever are different from the related art. It is no longer necessary to simultaneously operate to change the spray discharge amount. Secondly, if the rotation speed of the engine is reduced while the discharge pressure adjusting valve 4 is in a high pressure state, an erroneous operation that rotation stops due to insufficient horsepower occurs. 4 and the accelerator adjustment device are operated only in the associated direction, so that the mistake of stopping the engine due to high discharge pressure is eliminated.

[Brief description of the drawings]

FIG. 1 is a rear view of a backpack type power sprayer according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a rear cross-sectional view of the adjustment handle 2 and the discharge pressure adjustment valve 4 of the present invention.

FIG. 4 is a rear sectional view showing another embodiment.

[Explanation of symbols]

 E engine P power sprayer 1 accelerator adjustment wire 2 adjustment handle 4 discharge pressure adjustment valve 5 suction valve 6 cam surface 7 ball 8 wire end locking body 9 biasing spring 12 piston 15 spring pressure adjustment rod

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F02D 9/00-11/10 F02B 63/00

Claims (1)

(57) [Claims] 1. In a backpack type power sprayer equipped with an engine E and a power sprayer, a discharge pressure adjusting valve 4 for adjusting the level of the discharge pressure of the power sprayer, and a bias for pressing the discharge pressure adjuster valve 4. A spring 3 and an accelerator adjusting wire 1 for adjusting the level of the number of revolutions of the engine E are provided, and an adjusting handle 2 for rotating and adjusting is provided at a position where the operator can operate it while carrying on his back. An inner diameter screw portion is provided at a rotation center position, and further, at an outer peripheral position of the inner diameter screw portion.
A cam surface provided on the inner diameter screw portion and the cam surface, the biasing spring 3 of the discharge pressure regulating valve 4, or of the accelerator adjustment wire 1 throat
The back-and-forth type power is characterized in that the level of the discharge pressure and the level of the engine speed can be simultaneously and simultaneously operated by rotating one adjusting handle 2 by engaging and disengaging one of the two. Sprayer.