JP2002317768A - Pump driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem on a conventional reciprocating type pump utilizing the force of a spring for pulling down a reciprocating body of the pump that insufficient pull-down occurs during faster reciprocating motion, resulting in the lower performance of the pump such as an unstable or erroneous discharge amount. SOLUTION: The reciprocating type pump 27 is arranged on one side of a pump driving case 70, an oscillating crank 39 is connected at one end to the reciprocating body 38 of the pump 27, a motor 28 is provided on the other side of the pump driving case 70, an eccentric cam 45 is connected to a driving shaft of the motor, the eccentric cam is connected to the other end of the oscillating crank for cranking motion of the oscillating crank, an oblong hole 39a is provided in the longitudinal direction of the oscillating crank, a supporting point 46 is inserted into the oblong hole, and the supporting point is connected to a threaded bar 47 for adjustment of the discharge amount with the turning of the threaded bar.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for enabling a discharge amount of a reciprocating pump to be arbitrarily and continuously variable, and more particularly to a diaphragm type chemical liquid delivery pump used for a soil disinfection apparatus. It relates to an improved structure.

[0002]

2. Description of the Related Art Conventionally, a structure in which a diaphragm-type chemical solution delivery pump is attached to a soil disinfection device towed by a tractor or a management machine is known, for example, as disclosed in JP-A-4-325047. It has been disclosed. The configuration is such that a diaphragm or the like is pushed up by a cam mechanism, and the lowering direction is pulled down to the original position using a spring.

[0003]

However, in the above prior art, a pulling force higher than the force of the spring does not work, and the pulling force cannot be lowered depending on the capacity of the pump function. Uneven rotation occurs in prime movers with limited torque, such as electric motors, which consume energy up to the extent of the pull-down spring. Further, when the rotor is rotated at a high speed, the depression of the spring may not catch up. As a result, there is a problem that the performance of the pump is deteriorated, for example, the discharge amount becomes unstable or an error occurs.

[0004]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

That is, in the first aspect of the present invention, a reciprocating pump is disposed on one side of the pump driving case, one end of a swing crank is connected to a reciprocating body of the pump, and the other side of the pump driving case is provided. A drive source, a drive shaft of the drive source is connected to an eccentric cam, and the eccentric cam is connected to the other end of the swing crank to cause the swing crank to make a crank motion. And a fulcrum is inserted into the elongated hole, the fulcrum is connected to a screw rod, and the discharge amount can be adjusted by rotating the screw rod. Further, in claim 2, the screw rod and the swing crank are arranged in parallel.

[0006]

Next, embodiments of the present invention will be described. 1 is a plan view of a tractor equipped with a soil disinfecting machine, FIG. 2 is a perspective view of the soil disinfecting machine, FIG. 3 is a perspective view of a front part of a tractor equipped with a chemical solution tank, a chemical solution delivery pump, and the like, and FIG. Internal plan view of diaphragm type chemical delivery pump, FIG. 5
FIG. 6 is a front view of the inside of the diaphragm-type drug delivery pump of the present invention, FIG. 6 is a left side view of the diaphragm-type drug delivery pump of the present invention, FIG. 7 is a cross-sectional view of the diaphragm-type drug delivery pump of the present invention, and FIG. It is a front view of the diaphragm type medical-solution delivery pump of the present invention.

First, the structure of a towing vehicle that pulls the soil disinfecting machine 20 will be described as a tractor. As shown in FIG. 1, the tractor includes a traveling vehicle 1 and a towing unit 10 connected to a rear portion of the traveling vehicle 1. Front and rear wheels of the traveling vehicle 1 have front wheels 2.2 and rear wheels, respectively. 3.3 is suspended. An engine, a battery 19, and the like are mounted in a hood 4 in front of the traveling vehicle 1, a steering handle 6 is disposed behind the hood 4, and a driver's seat 5 on which an operator sits is disposed behind the steering handle 6. Have been. Various operating devices such as a main shift lever and a PTO shift lever are disposed on side columns 7L and 7R on both sides of the driver's seat 5, and a foot accelerator pedal is provided at a foot in front of the driver's seat 5. , A left and right brake pedal, a main clutch pedal and the like are provided.

As shown in FIGS. 1 and 2, the towing portion 10 includes a top link 11, a lower link 12 and a lower link 12.
The top link 11 and the lower link 12
-It is configured so that various working machines can be connected to 12 and towed. The tractor of the soil disinfecting machine 20 is not limited to a tractor, but may be a cultivator or the like.

Next, a description will be given of an overall configuration in a case where the tractor is the traveling vehicle 1 and the soil disinfecting machine 20 is mounted on the towing portion 10 thereof. As shown in FIGS. 1 and 2, top link masts 21 are provided at the front end of the mounting portion of the soil disinfecting machine 20, and the upper ends of the top link masts 21 are connected to the top link 11 of the tractor 10 of the tractor. At the lower end of the top link mast 21, there is a support rod 2.
The rear ends of the lower links 12 are pivotally connected to left and right pins 41 which project outward from the front ends of the support rods 22. In this way, the top link 11 and the lower link 12 are used for the
And can be supported and towed.

At the rear surface of the support rods 22, a "U" -shaped mounting frame 23 is fixedly mounted in plan view.
At the rear end of the mounting frame 23, the two arms 23
A pressure reducing roller 25 is rotatably supported between a and 23a, and is configured to press a field.

At the front end, the arms 23a
In the connecting portion 23b of the mounting frame 23 connecting the 3a,
Are disposed at regular intervals, and on the back of the liquid injection claws 26, 26,.
The chemical liquid injection nozzles 29 are provided so as to be set at a predetermined depth.

As shown in FIGS. 1 and 3, at the front portion of the traveling vehicle 1, a "U" -shaped support frame 31 is fixedly mounted forward from both sides thereof.
On the upper surface of the front part of the support frame 31,
2 and 32 are fixedly mounted, and the chemical liquid tanks 24 and 24 are mounted on the chemical liquid tank mounting tables 32 and 32, respectively. In the two arm portions 31a constituting the support frame 31, a support plate 33 is laid transversely at an intermediate position in the longitudinal direction, and the same number of the chemicals as the chemical injection nozzles 29 are provided on the support plate 33. The delivery pumps 27 are fixedly provided. Thus, the chemical solution delivery pumps 27 are arranged side by side immediately after the chemical solution tanks 24 in a positional relationship. In addition, each chemical solution delivery pump 27
27 are motors 28, 28,.
Are operated by the motor switch panel 60 disposed near the driver's seat 5 (in this embodiment, the right side column 7R).

[0013] The chemical solution delivery pump 27
.. and chemical liquid tanks 24, 24 are suction pipes 51, 51
, And the chemical solution delivery pump 27
Are connected to each other by discharge pipes 52.

Next, the structure of the pump driving device of the present invention will be described with reference to FIGS. In the pump driving device, a diaphragm type pump 27 is disposed as a reciprocating pump at an upper portion on one side of a pump driving case 70. However, it is also applicable to a plunger type pump or the like. The pump 27 has a valve attachment member 43 protruding upward from a suction pipe 51 and a discharge pipe 52 at an upper end, and a diaphragm attachment member 71, and the diaphragm 37 is sandwiched from above and below and attached. The connecting pin 72 is suspended from the lower center, and the connecting rod 38 serving as a reciprocating body is connected to the connecting pin 72 and the lower part is inserted into the pump drive case 70. The lower end of the connecting rod 38 is pivotally supported at the upper end of one end of the swing crank 39 via a pivot 44. The swing crank 39 is provided with a long hole 39a on the pump side, and an elliptical hole 39b is opened on the drive source side.
A fulcrum cam 46 serving as a fulcrum is inserted into 9a, and an eccentric cam 45 is inserted into the elliptical hole 39b.

The fulcrum cam 46 is formed in a disk shape, penetrates a connecting shaft 53 at the center, and is rotatably supported by the connecting shaft 53. A sliding body 53a is integrally formed on the connecting shaft 53, and an adjusting screw 47 is screwed on the sliding body 53a, and a guide shaft 53b is formed at an end of the sliding body 53a to drive the pump. Guide hole 70a drilled in case 70
Has been inserted. The other end of the connection shaft 53 is also inserted into a guide hole 70b formed in the pump drive case 70 and protrudes to the side. The guide holes 70a and 70b are formed in the shape of a long hole and are arranged to face each other, and are arranged in parallel with the adjusting screw rod 47. The adjusting screw rod 47 is a swing crank 3
9 is arranged in a direction perpendicular to the connecting shaft 53, one end of which is pivotally supported by the pump drive case 70, and the end of which is projected from the side surface. 48 are fixed. A scale plate 70c is provided in the pump drive case 70 along the guide hole 70a. In such a configuration, the adjustment knob 48
When the adjusting screw rod 47 is rotated by holding the sliding member 53a, the sliding body 53a screwed on the adjusting screw rod 47 is moved to the guide holes 70a and 70.
The fulcrum cam 46 supported by the connecting shaft 53 also slides at the same time as it is slid in the axial direction guided by 0b, and its position can be easily recognized by the scale 70c.

A drive shaft 49 is inserted into the shaft center of the eccentric cam 45 and is connected to the eccentric cam 45 via a collar 54 so as to be relatively unrotatable. The collar 54 and the eccentric cam 45 are fixed so that the collar 54 and the eccentric cam 45 do not come off from the swinging crank 39 by fitting the fasteners 55 on both sides of the collar 54. .

Both sides of the drive shaft 49 penetrating the eccentric cam 45 are projected from both sides from the pump drive case 70,
The drive shaft 49 is rotatably supported by a pump drive case 70. One end of the drive shaft 49 is connected to a drive shaft 28a of a drive motor 28 via a boss, and the other end can drive another pump. The drive motor 28, as shown in FIG.
Pump case 70 of diaphragm type chemical solution delivery pump 27
Fixed on the outer surface of the

In the above configuration, when the drive shaft 49 is driven to rotate by the drive of the drive motor 28, the eccentric cam 45 rotates, and one end of the swing crank 39 slidingly contacting the outer periphery of the eccentric cam 45 moves up and down. . The swing crank 3
The other end of 9 reciprocates up and down with the fulcrum cam 46 as a fulcrum, and the diaphragm 37 connected to the swing crank 39 via the connecting rod 38 also reciprocates up and down. As a result, the valves provided in the suction pipe 51 and the discharge pipe 52 are opened and closed, and the suction and discharge operations of the chemical solution are performed.

Next, adjustment of the discharge amount will be described. As described above, when the adjustment knob 48 is rotated, the fulcrum cam 4 is moved.
6 slides in the elongated hole 39a, and the fulcrum position of the swing crank 39 is changed. In other words, since the eccentric cam 45 side cannot move and adjust, the vertical movement distance of the swing crank 39 on that side is constant, and the more the fulcrum cam 46 serving as the fulcrum is moved closer to the eccentric cam 45 side, the more the eccentric cam 45 moves. Dynamic crank 3
9, the vertical movement distance of the other side (pivot shaft 44 side) becomes longer,
The amount sucked into the diaphragm increases, and the discharge amount can also increase. Conversely, as the fulcrum cam 46, which is a fulcrum, is moved away from the eccentric cam 45, the vertical movement distance on the other side of the swing crank 39 is reduced, and the discharge amount is reduced.

In the above-described configuration, in the case of the conventional diaphragm-type chemical liquid delivery pump, since the diaphragm is lowered by the spring, the lowering force exceeding the force of the spring does not work, and depending on the capability of the pump function, the diaphragm may be lowered. However, in the diaphragm type chemical solution delivery pump of the present invention, the pump reciprocating movement is performed by a cam and a crank,
Do not use springs when pulling down. Therefore, the discharge amount can be changed with high accuracy. Further, by using the disk-shaped fulcrum cam 46 as the fulcrum of the vertical reciprocation of the pump, the friction when moving in the long hole 39a of the swing crank 39 is small, and the friction when the swing crank 39 swings is also reduced. It becomes smaller and the durability can be improved.

In a conventional diaphragm-type chemical liquid delivery pump using a spring or changing the position of a cam follower, the pump drive case is large. Since the configuration for moving the fulcrum is arranged, the pump drive case 70 can be made compact.

[0022]

The present invention is configured as described above.
The following effects are obtained.

That is, a reciprocating pump is disposed on one side of the pump driving case, and one end of a swing crank is connected to a reciprocating body of the pump. A drive source is provided on the side, an eccentric cam is connected to a drive shaft of the drive source, and the eccentric cam is connected to the other end of the swing crank to cause the swing crank to make a crank motion. Direction, a fulcrum is inserted into the elongate hole, the fulcrum is connected to the screw rod, and the discharge amount can be adjusted by turning the screw rod. Is not required, the structure is simplified, and the lifting and lowering are reliably performed, thereby eliminating the uneven rotation. In addition, the driving force from the driving source can be reliably used for reciprocating motion, and pump performance can be improved.
Energy efficiency was improved. Claim 2
In, the screw rod and the swing crank are arranged in parallel, so that the pump can be housed compactly in the pump drive case, and the pump can be downsized.

[Brief description of the drawings]

FIG. 1 is a plan view of a tractor equipped with a soil disinfection machine.

FIG. 2 is a perspective view of a soil sterilizer.

FIG. 3 is a perspective view of a front portion of a tractor on which a chemical solution tank, a chemical solution delivery pump, and the like are mounted.

FIG. 4 is an internal plan view of the diaphragm-type drug solution delivery pump of the present invention.

FIG. 5 is an internal front view of the diaphragm type chemical liquid delivery pump of the present invention.

FIG. 6 is a left side view of the diaphragm-type medical solution delivery pump of the present invention.

FIG. 7 is a cross-sectional view of the diaphragm-type chemical solution delivery pump of the present invention, as viewed in the direction of arrows.

FIG. 8 is a front view of the diaphragm-type drug solution delivery pump of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Running vehicle 19 Battery 20 Soil disinfection machine 24 Chemical solution tank 27 Chemical solution delivery pump 35 Connecting shaft 37 Diaphragm 38 Connecting rod 39 Swing crank 51 Infeed pipe 52 Discharge pipe

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) F04B 23/02 F04B 1/00 // A01M 17/00 F term (reference) 2B121 CB01 CB14 CB23 CB33 CB42 CB43 CB47 CB51 CB61 EA25 3H070 AA07 BB02 BB12 BB23 CC21 CC34 DD39 DD44 DD57 DD59 DD92 3H071 AA15 BB01 BB12 CC11 CC17 CC33 DD43 3H075 AA09 BB02 BB30 CC11 CC25 CC34 DB03 DB22 DB30 DB35 3H077 AA07 BB10 CCA CC EE CC

Claims (2)

[Claims] 1. A reciprocating drive type pump is disposed on one side of a pump drive case, one end of a swing crank is connected to a reciprocating body of the pump, and a drive source is provided on the other side of the pump drive case. An eccentric cam is connected to the drive shaft of the drive source, and the eccentric cam is connected to the other end of the oscillating crank to make the oscillating crank perform a crank motion, and a long hole is provided in a longitudinal direction of the oscillating crank, A driving device for a pump, wherein a fulcrum is inserted into the elongated hole, the fulcrum is connected to a screw rod, and the discharge amount can be adjusted by rotating the screw rod. 2. The pump driving device according to claim 1, wherein the screw rod and the swing crank are arranged in parallel.