KR20020081059A - Pump driving apparatus - Google Patents

Abstract

PURPOSE: 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. CONSTITUTION: 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

Pump Drive {PUMP DRIVING APPARATUS}

The present invention relates to a technique for allowing the discharge amount of a reciprocating pump to be arbitrarily changed steplessly, and more particularly, to an improved structure of a diaphragm type chemical liquid delivery pump used in a soil disinfection device.

Background Art Conventionally, a structure in which a diaphragm type chemical delivery pump is attached to a soil disinfection device towed by a tractor or a manager is known, and is disclosed, for example, in Japanese Patent Laid-Open No. 4-325047.

The structure was configured such that the pushing up of the diaphragm and the like was pushed up by the cam mechanism, and the lowering direction was pulled down to the initial position using a spring.

However, in the above prior art, the pulling force other than the spring force does not work and cannot be pulled down completely depending on the capability of the pump function, but when pushing up, the energy of the pump function is added to the pulling spring force. Rotational imbalance occurred in the prime mover with limited torque such as electric motors. In addition, when the high-speed rotation also occurred when the spring of the spring can not follow.

As a result, there was an unreasonable drop in the performance of the pump, such as destabilization of the discharge amount and generation of errors.

1 is a plan view of a tractor equipped with a soil sterilizer,

2 is a perspective view of the soil sterilizer,

3 is a perspective view of the front of the tractor equipped with a chemical liquid tank, a chemical liquid delivery pump,

4 is an internal plan view of the diaphragm type chemical delivery pump of the present invention;

5 is an internal front view of the diaphragm type chemical delivery pump of the present invention;

6 is a left side view of the diaphragm type chemical delivery pump of the present invention;

7 is a cross-sectional view taken by the X-ray arrow in FIG. 5 of the diaphragm type chemical delivery pump of the present invention;

8 is a front view of a diaphragm type chemical delivery pump of the present invention.

The problem to be solved by the present invention is as described above, and means for solving the problem will be described next.

That is, according to claim 1, a reciprocating pump is arranged on one side of the pump drive case, one end of the swing crank is connected to the reciprocating body of the pump, and a drive source is provided on the other side of the pump drive case. Connect the eccentric cam to the drive shaft of the crank, and connect the eccentric cam to the other side of the swing crank to crank the swing crank, form a long hole in the longitudinal direction of the swing crank, and insert a point into the long hole. The point is connected to the screw lever, and the discharge amount can be adjusted by the rotation of the screw lever.

In claim 2, the screw lever and the swing crank are arranged in parallel.

Next, an embodiment of the present invention will be described.

First, the configuration will be outlined by using a tractor towing the soil sterilizer 20 as a tractor.

As shown in FIG. 1, the tractor is composed of a traveling vehicle 1 and a towing portion 10 connected to the rear portion of the traveling vehicle 1, and the front wheel and the rear wheel of the traveling vehicle 1 are respectively formed. 2, 2) and rear wheels 3 and 3 are hooked. In the bonnet 4 in front of the traveling vehicle 1, an engine, a battery 19, and the like are mounted, and a steering wheel 6 is disposed behind the bonnet 4, and a driver's seat in which the operator sits. 5) is installed. Moreover, various operation mechanisms, such as a peripheral speed lever and a PTO shift lever, are arrange | positioned at the side column 7L, 7R of both sides of the said driver's seat 5, and the accelerator pedal and left and right brakes are provided in the foot of the driver's seat 5 front. A pedal and a main clutch pedal are arranged.

1 and 2, the towing unit 10 is constituted by an upper link 11, a lower link 12 and 12, and the upper link 11 and a lower link 12 and 12. It is configured to tow by connecting various work machines.

The towing vehicle of the soil sterilizer 20 is not limited to a tractor, but a tiller or the like may be used.

Next, the whole structure when the tractor is used as the traveling vehicle 1 and the soil sterilizer 20 is attached to the towing unit 10 will be described.

1 and 2, upper link masts 21 and 21 are installed at the front end of the mounting portion of the soil sterilizer 20, and the upper ends of the upper link masts 21 and 21 are pulled from the tractor 10. And the rear end of the upper link 11 of the upper link 11, and the front ends of the support levers 22 and 22 are fixed to the lower ends of the upper link masts 21 and 21, and the front ends of the support levers 22 and 22. The rear ends of the lower links 12 and 12 are pivotally connected to the left and right pins 41 and 41 protruding outward from each other. In this manner, the soil sterilizer 20 is reliably supported by the upper link 11 and the lower links 12 and 12 so as to be pulled out.

On the rear surface of the support levers 22 and 22, an attachment frame 23 having a "co" shape is fixed in a plan view, and at the rear end of the attachment frame 23, a suppression is provided between both arm portions 23a and 23a. The roller 25 is rotatably axially supported and configured to press the package.

In addition, a plurality of chemical liquid injection claws 26, 26,... Are arranged at a predetermined interval in the connection construction portion 23b of the attachment frame 23 for connecting the arm portions 23a, 23a at the front end thereof. The chemical liquid injection nozzles 29, 29,... Are arranged on the rear surface of the chemical liquid injection claws 26, 26,...

In addition, as shown in Fig. 1 and Fig. 3, in the front part of the traveling vehicle 1, the support frame 31 having a "co" shape is fixed in a plan view from both sides toward the front, and the support frame is fixed. (31) The chemical liquid tanks 24 and 24 are placed on the front upper surface.

In both arm portions 31a and 31a constituting the support frame 31, a support plate 33 is provided horizontally at a longitudinal intermediate position thereof, and the chemical liquid injection nozzles 29, 29, The same number of chemical liquid delivery pumps 27, 27, ... are fixed. In this way, the chemical liquid delivery pumps 27, 27, ... are arranged in parallel with the chemical liquid tanks 24, 24 in a positional relationship. In addition, each of the chemical liquid delivery pumps 27, 27, ... is equipped with motors 28, 28, ... serving as a power source, and the operation of the motors 28, 28, ... is performed near the driver's seat 5 (this embodiment). In this case, the motor switch panel 60 is arranged on the left side column 7R.

The chemical liquid delivery pumps 27, 27, ... and the chemical liquid tanks 24, 24 communicate with the suction pipes 51, 51, ..., and the chemical liquid delivery pumps 27, 27, ... with the chemical liquid. The injection nozzles 29, 29,... Are connected by discharge pipes 52, 52,...

Next, the structure of the pump drive apparatus of this invention is demonstrated with reference to FIGS. In the pump drive device, a diaphragm pump 27 is disposed as a reciprocating pump on one side of the pump drive case 70. However, it is also applicable to a plunger type pump. In the pump 27, the diaphragm 37 is moved up and down by the valve attachment member 43 and the diaphragm attachment member 71, which protrude and install the suction pipe 51 and the discharge pipe 52 on the upper end. The connecting pin 72 is hung from the center lower portion of the diaphragm 37, and the connecting rod 38 connected to the connecting pin 72 as a reciprocating member is connected to the lower portion of the connecting rod 38. Is inserted into the pump drive case (70). The lower end of the connecting rod 38 is pivoted on one end of the swing crank 39 via the pivot shaft 44. The swing crank 39 has a long hole 39a formed at the pump side, an elliptical hole 39b is opened at the drive source side, and a point cam 46 is inserted into the long hole 39a. The eccentric cam 45 is inserted into the elliptical hole 39b.

The point cam 46 is formed in a disk shape and pivotally pivotally connected to the connecting shaft 53 through the connecting shaft 53 at the center thereof. A sliding body 53a is integrally formed on the connecting shaft 53, and an adjustment screw lever 47 is screwed on the sliding body 53a, and a guide shaft 53b is formed at an end of the sliding body 53a. ), And the guide shaft 53b is inserted into the guide hole 70a formed in the pump drive case 70. The other end of the connecting shaft 53 is also inserted into the guide hole 70b formed in the pump drive case 70 to protrude laterally. The guide holes 70a and 70b are arranged in a long hole shape to face each other, and are arranged in parallel with the adjustment screw lever 47. The adjustment screw lever 47 is installed in parallel with the swinging crank 39 and is disposed at a right angle with respect to the connecting shaft 53, and pivots one end thereof to the pump drive case 70 and ends the end thereof. The adjustment knob 48 is fixed to the end by protruding from the side. The pump drive case 70 is provided with a scale plate 70c along the guide hole 70a.

In such a configuration, when the adjusting screw lever 47 is rotated with the adjusting knob 48, the sliding body 53a screwed to the adjusting screw lever 47 is guided to the guide holes 70a and 70b. And slid in the axial direction, and the point cam 46 supported by the connecting shaft 53 is also slid at the same time, and the position thereof can be easily recognized by the scale plate 70c.

In addition, a drive shaft 49 is inserted into the axial center portion of the eccentric cam 45, is connected relative to the key 56 so as not to rotate, the eccentric cam (45) through the collar 54 on the eccentric cam 45 54 is slidably supported in the elliptical hole 39b of the swinging crank 39, and the clamps 55 and 55 are fitted to both sides of the collar 54, and the collar 54 from the swinging crank 39. And the eccentric cam 45 is fixed so as not to fall out.

Both sides of the drive shaft 49 penetrating the eccentric cam 45 protrudes in both sides from the pump drive case 70 to be rotatably supported by the pump drive case 70, and driven at one end of the drive shaft 49. The drive shaft 28a of the motor 28 is connected via the boss, and the other end allows the other pump to be driven.

The drive motor 28 is fixed to the outer surface of the pump case 70 of the diaphragm type chemical delivery pump 27 as shown in FIG.

In the above configuration, when the drive shaft 49 is rotated by the drive of the drive motor 28, the eccentric cam 45 rotates, and the swing crank 39 is in sliding contact with the outer circumference of the eccentric cam 45. One end moves up and down. The other end of the swing crank 39 is reciprocated up and down with the point cam 46 as a point, and the diaphragm 37 connected to the swing crank 39 through 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 liquid are performed.

Next, adjustment of the discharge amount will be described. As described above, when the adjusting knob 48 is rotated, the point cam 46 slides in the long hole 39a to change the point position of the swing crank 39. That is, since the side of the eccentric cam 45 cannot be moved and adjusted, the distance of the shank east of the swing crank 39 becomes constant, and the point cam 46 serving as a point moves closer to the eccentric cam 46 side. As a result, the vertical movement distance of the other side (the pivot shaft 44 side) of the swing crank 39 is lengthened, so that the amount sucked into the diaphragm increases, and the discharge amount can also increase. Conversely, as the point cam 46, which becomes a point, moves away from the eccentric cam 45, the vertical movement distance of the other side of the swing crank 39 is shortened, and the discharge amount is reduced.

In the above configuration, in the case of the conventional diaphragm type chemical delivery pump, since the diaphragm is pulled down by the spring, the pulling force other than the spring force does not work, and accordingly the pump function can be pulled down completely. Although the pump performance is deteriorated, the diaphragm type chemical liquid delivery pump of the present invention uses a cam and a crank to reciprocate the pump. Therefore, no spring is used when the pump is pulled down. Therefore, the discharge amount can be changed precisely.

Moreover, when the point of pump up and down reciprocating movement is made into the disk-shaped point cam 46, the friction at the time of moving in the long hole 39a of the swing crank 39 is small, and the wear degree at the time of the swing crank 39 swings, too. It is also possible to improve the durability by reducing the number.

Moreover, in the conventional diaphragm type chemical | medical liquid delivery pump which uses a spring or changes the position of a cam follower, although the pump drive case was large, the point moves in the oscillation crank 39 like this invention. Because the arrangement is made, the pump drive case 70 can be made compact.

Since this invention is comprised as mentioned above, it has the effect as shown below.

That is, as shown in claim 1, one reciprocating pump of the pump driving case is arranged, one end of the oscillating crank is connected to the reciprocating body of the pump, and a driving source is provided on the other side of the pump driving case, A eccentric cam is connected to a drive shaft of the driving source, and the eccentric cam is connected to the other end of the rocking crank to crank the rocking crank, and at the same time, a long hole is formed in the longitudinal direction of the rocking crank. And the point is connected to the screw lever, and the discharge amount can be adjusted by the rotation of the screw lever, thus eliminating the need for a spring for returning the reciprocating body, simplifying the structure, and pulling and pulling it. It is possible to make sure that the lowering is done to eliminate the rotation defect. In addition, the driving force from the driving source can be surely used for the reciprocating motion, thereby improving pump performance and improving energy efficiency.

Further, in claim 2, since the screw lever and the swing crank are arranged in parallel, the pump can be miniaturized in the pump drive case, thereby miniaturizing the pump.

Claims (2)

A reciprocating pump is disposed on one side of the pump drive case, one end of the swing crank is connected to the reciprocating member of the pump, a drive source is installed on the other side of the pump drive case, and an eccentric cam is connected to the drive shaft of the drive source. And crank the oscillating crank by connecting the eccentric cam to the other end of the oscillating crank, at the same time forming a long hole in the longitudinal direction of the oscillating crank, and inserting a point in the elongated hole to connect the point with the screw lever. The pump driving device, characterized in that for controlling the discharge amount by the rotation of the screw lever. The pump drive device according to claim 1, wherein the screw lever and the swing crank are arranged in parallel.