JP2007303279A - Pump drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in which it takes time to set delivery quantity and a load on a worker is high since an oscillation fulcrum for adjusting the delivery quantity of a pump provided at a middle of an oscillation crank is moved by rotation of a screw rod in a conventional pump drive device having one end of the oscillation crank connected to a reciprocating moving body driving a reciprocating drive type pump provided on a soil disinfecting machine, having an eccentric cam connected to another end of the oscillation crank, and driving the reciprocating drive type pump by driving and rotating the eccentric cam via the reciprocating moving body. <P>SOLUTION: The device has a structure connecting an adjustment lever 44 to the oscillation fulcrum 41 and quickly moving a position of the oscillation fulcrum 41 by slide operation of the adjustment lever 44 in a longitudinal direction of the oscillating crank 40. Delivery quantity of the reciprocating drive type pump 29 is adjusted by controlling reciprocating motion of the reciprocating moving body 37. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pump drive device that can control the discharge amount of a reciprocating pump in a stepless manner, and more particularly, to a pump drive device for driving a diaphragm type chemical solution delivery pump used in a soil disinfecting machine.

Conventionally, a structure in which a reciprocating pump such as a diaphragm-type chemical solution delivery pump is attached to a soil disinfecting device mounted on a tractor or a management machine is known, and the driving of the reciprocating pump is connected to a diaphragm. A reciprocating body such as a rod is pushed up by a cam mechanism, lowered to the original position by the elastic force of a spring, and this is repeated. Therefore, when pushing up, it must be pushed up against not only the diaphragm etc. but also the elastic force of the spring, and an excessive pushing force is required, and in motors such as electric motors with limited torque, uneven rotation occurs. Furthermore, at the time of pulling down, the elastic force of the spring alone is not sufficient as the pulling force, and depending on the pump structure, it cannot be pulled down to the end, or the responsiveness of the spring is slow and the pulling operation is performed when the cam mechanism is driven at high speed. As a result, there is a problem in that the discharge amount is not constant and unstable, and the pump performance is deteriorated because accurate discharge cannot be performed.
Therefore, one end of an oscillating crank is connected to the reciprocating body that drives the reciprocating drive type pump, an eccentric cam is connected to the other end of the oscillating crank, and the eccentric cam is rotationally driven to rotate the oscillating crank. The crank is caused to perform a crank motion, and a long hole is provided in the longitudinal direction of the swinging crank. A swinging fulcrum is inserted into the long hole, and a screw rod connected to the swinging fulcrum is rotated to swing the crank. A technique (for example, Patent Document 1) is known in which a moving fulcrum is moved to change a vertical reciprocating width of a reciprocating moving body to control a discharge amount steplessly. This eliminates the need for a spring for returning the reciprocating body and simplifies the structure, assures that it is pushed up and pulled down to eliminate uneven rotation, and the driving force from the driving source is reliably utilized for reciprocating motion. Pump performance can be improved.
JP 2002-317768 A

  However, in the conventional technique in which the swinging fulcrum of the swinging crank is moved in this way to control the discharge amount, the screw 杆 is screwed into the swinging fulcrum and the screw 杆 is rotated in the circumferential direction. The swing fulcrum is moved by moving it, but the moving speed of the swing fulcrum is extremely small. For example, in the case of a normal single-thread screw, even if the screw rod is rotated once, the swing fulcrum advances only by one pitch of the screw thread, and the normal operation is confirmed and the air inside the chemical hose is vented by a test run before work. Therefore, in order to set the reciprocating drive pump to the maximum discharge amount, the screw rod must be rotated many times, and it takes a long time to set the discharge amount, and there is a problem that the load on the operator is large. Also, if you want to change the discharge amount suddenly during work, or if you want to stop discharging only a specific reciprocating pump, etc., if it takes too long to change the discharge amount, the chemical solution to be injected into the soil during that time There was a problem that shortages and excesses occurred, resulting in a decrease in crop yield and quality.

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
That is, according to the first aspect of the present invention, one end of the swinging crank is connected to the reciprocating moving body that drives the reciprocating drive pump, and the eccentric cam is connected to the other end of the swinging crank, so that the eccentric cam is rotationally driven. Thus, in the pump drive device in which the swinging crank is caused to perform a crank motion and a swinging fulcrum is provided in the middle in the longitudinal direction of the swinging crank, an adjusting lever is connected to the swinging fulcrum, and the adjusting lever is swung. A structure in which the position of the oscillating fulcrum can be quickly moved by sliding in the longitudinal direction of the dynamic crank, and the discharge amount of the reciprocating drive pump is adjusted by controlling the reciprocating motion of the reciprocating body. It is.
According to a second aspect of the present invention, the adjusting lever is inserted into the guide member, and a fixing tool is provided on the guide member, and the adjusting lever is locked at a predetermined position by the fixing tool.

Since this invention was comprised as mentioned above, there exists an effect shown below.
That is, according to the first aspect of the present invention, one end of the swinging crank is connected to the reciprocating moving body that drives the reciprocating drive pump, and the eccentric cam is connected to the other end of the swinging crank, so that the eccentric cam is rotationally driven. Thus, in the pump drive device in which the swinging crank is caused to perform a crank motion and a swinging fulcrum is provided in the middle in the longitudinal direction of the swinging crank, an adjusting lever is connected to the swinging fulcrum, and the adjusting lever is swung. By sliding the moving crank in the longitudinal direction, the position of the swing fulcrum can be moved quickly, and the reciprocating motion of the reciprocating body is controlled to adjust the discharge amount of the reciprocating pump. In order to confirm normal operation and to release air from the chemical solution hose during the trial run before work, the reciprocating pump can be quickly set to the maximum discharge rate, and the screw rod is rotated many times. That it is unnecessary, the setting of discharge amount can be performed in a short time, it is possible to also reduce the load of the operator. In addition, even if you want to change the discharge amount suddenly during work, or if you want to stop discharging only a specific reciprocating drive pump, you can quickly change the discharge amount and supply chemical solution to the soil without excess or deficiency. It is possible to increase the yield and quality of crops.
According to a second aspect of the present invention, the adjusting lever is inserted into the guide member, and a fixing member is provided on the guide member, and the adjusting lever is locked at a predetermined position by the fixing member. Can be formed with a simple configuration, and the cost of parts of the pump drive device can be reduced and the maintainability can be improved. Furthermore, the adjustment lever can be securely fixed at a predetermined position by a fixing tool, and the discharge position can be reliably maintained at a predetermined value without the adjustment lever being displaced during the operation due to vibration of the traveling machine. It can be done.

Next, embodiments of the invention will be described.
FIG. 1 is an overall plan view showing the overall configuration of a tractor equipped with a soil disinfecting machine according to the present invention, FIG. 2 is a perspective view of a chemical solution injection part of the soil disinfecting machine, and FIG. 3 is a perspective view of a chemical solution supplying part of the soil disinfecting machine. 4 is a partial cross-sectional side view of a diaphragm type chemical solution delivery pump, FIG. 5 is a partial partial side view showing a pump driving device configuration of the diaphragm type chemical solution delivery pump, FIG. It is a back view similarly.

First, a vehicle to which the soil disinfecting machine 1 is attached is a tractor 2, and a schematic configuration of the tractor 2 will be described with reference to FIGS.
As shown in FIG. 1, the tractor 2 includes a traveling vehicle 2a and a mounting portion 2b connected to the rear portion of the traveling vehicle 2a. Front and rear portions of the traveling vehicle 2a have front wheels 3 and 3, respectively. And the rear wheels 4 and 4 are suspended. An engine, a battery 6 and the like are mounted in the bonnet 5 at the front part of the traveling vehicle 2a, and a steering handle 7 is disposed at the rear of the bonnet 5, and further behind the steering handle 7. A driver's seat 8 on which an operator sits is provided. The side columns 9L and 9R on both sides of the driver seat 8 are provided with various operation tools such as a main speed change lever and a PTO speed change lever. A foot accelerator pedal and a left and right brake pedal are provided at the front of the driver seat 8. A main clutch pedal and the like are provided.

  As shown in FIGS. 1 and 2, the mounting portion 2b is composed of a top link 10, a lower link 11, 11 and the like, and can be pulled by connecting various working machines to the top link 10, the lower link 11, 11. It is configured as follows. In addition, a tiller etc. may be used for the vehicle of the said soil disinfection machine 1, and it is not limited to the tractor 2. FIG.

Next, the whole structure of the soil disinfector 1 attached to the tractor 2 will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the soil disinfecting machine 1 includes a chemical solution supply unit 1a that supplies a chemical solution and a chemical solution injection unit 1b that injects the chemical solution into the soil. Among these, in the liquid injector 1b, top link masts 12 and 12 are provided at the front ends, and the upper ends of the top link masts 12 and 12 are connected to the rear portion of the top link 10 of the mounting portion 2b of the tractor 2. On the other hand, the front ends of the support rods 13 and 13 are connected and fixed to the lower ends of the top link masts 12 and 12, and the left and right pins 14 and 14 projecting outward from the front ends of the support rods 13 and 13 are connected to the lower link. The rear ends of 11 and 11 are pivoted. Through such a top link 10, lower links 11 and 11, and top link masts 12 and 12, the chemical injection part 1b of the soil disinfecting machine 1 is securely connected and supported to the mounting part 2b of the tractor 2 so that it can be pulled. ing.

  A mounting frame 15 having a U-shape in plan view opened rearward is fixed to the rear surface of the support rods 13 and 13, and a pressure reducing roller 16 is provided between the rear portions of the left and right arm portions 15a and 15a of the mounting frame 15. Is rotatably supported and is configured to press the soil after the chemical solution is injected. A plurality of chemical solution injection claws 17, 17... Are arranged at regular intervals on the connecting portion 15 b that is connected between the front ends of the arm portions 15 a, 15 a. .. Are disposed so as to be set at a predetermined depth.

  As shown in FIG. 1 and FIG. 3, in the chemical solution supply part 1a, a rear end of a U-shaped support frame 19 opened rearward is fixed to the front part of the traveling vehicle 2a. On the upper surface of the front part of the support frame 19, chemical liquid tank mounting tables 20, 20 are fixed, and chemical liquid tanks 21, 21 are mounted on the chemical liquid tank mounting tables 20, 20.

  A support plate 22 is installed in the middle in the longitudinal direction of the left and right arm portions 19a constituting the support frame 19, and the same number of drug solution delivery as the drug solution injection nozzles 18, 18. Pumps 23, 23... Are fixed. The chemical solution delivery pumps 23, 23,... Are juxtaposed immediately after the chemical solution tanks 21, 21, and each chemical solution delivery pump 23, 23,... Has a diaphragm pump as a reciprocating drive pump, A motor drive panel for driving the diaphragm pump, and the motors 24, 24... That are the drive source of the pump drive device are provided on the motor switch panel 25 disposed on the side column 9R on the right side of the driver seat 8. By operating each switch 25a, driving can be turned on and off.

  The chemical solution delivery pumps 23, 23,... And the chemical solution tanks 21, 21 are communicated with each other via suction hoses 26, 26, and the chemical solution delivery pumps 23, 23,. .. Are connected to the nozzles 18, 18... Via discharge hoses 27, 27.

Next, the configuration of the pump drive apparatus according to the present invention will be described with reference to FIGS.
The pump drive device 28 is provided in a pump drive case 30 of the chemical solution delivery pump 23 and is connected to and linked to a diaphragm pump 29 of a reciprocating drive pump provided on an upper portion of one side of the pump drive case 30. . The pump may be a plunger type instead of a diaphragm type, and is not particularly limited as long as it is a reciprocating drive type.

  As shown in FIGS. 4 and 7, in the diaphragm pump 29, the diaphragm 35 is sandwiched and fixed by a valve mounting member 33 and a diaphragm mounting member 34 from above and below, and the diaphragm mounting member 33 includes a diaphragm 35. A suction port 31 and a discharge port 32 communicating with 35 are projected upward, and the suction port 31 and the discharge port 32 are connected to the suction hose 26 and the discharge hose 27, respectively. On the other hand, a connecting pin 36 is suspended from the lower center of the diaphragm 35, and a connecting rod 37, which is a reciprocating body, is connected to the connecting pin 36, and the lower part of the connecting rod 37 is inserted into the pump drive case 30. Has been.

  As shown in FIGS. 3 to 7, in the pump drive device 28, the lower end of the connecting rod 37 of the diaphragm pump 29 is pivotally supported on the upper end of the swing crank 40 via the pivot shaft 39. The stopper 38 prevents the stopper from coming off. The swinging crank 40 is provided with a long hole 40a on the diaphragm pump 29 side and an elliptical hole 40b on the motor 24 side, and the long hole 40a is a swinging fulcrum. A fulcrum cam 41 is inserted, and an eccentric cam 42 is inserted into the elliptical hole 40b.

  The fulcrum cam 41 is formed in a disk shape, penetrates the connecting shaft 43 in the center, and is pivotally supported by the connecting shaft 43. An attachment portion 43 a is integrally formed on the other end side of the connecting shaft 43, and a tip portion of the adjustment lever 44 is fastened and fixed to the attachment portion 43 a by a bolt 45. Further, the outer end of the mounting portion 43a is narrowed to form a guide portion 43b, and the guide portion 43b is inserted into a guide hole 30a that is formed in a long hole shape in the pump drive case 30.

  The pump drive case 30 is also provided with a guide hole 30b, and the connecting shaft 43 side is inserted into the guide hole 30b and extends outward. A pointer 48 is attached to the extending end of the connecting shaft 43, and a scale plate 47 for reading the position of the pointer 48 is disposed along the guide hole 30b. The guide holes 30 a and 30 b are arranged to face each other and are arranged in parallel with the adjustment lever 44.

  The adjusting lever 44 is disposed in parallel with the swinging crank 40 and is disposed in a direction perpendicular to the connecting shaft 43, and its base is attached to a lever guide 46 attached to the pump drive case 30. It is pivotally supported. The adjustment lever 44 protruding outward from the lever guide 46 is bent downward to form a lever operating portion 44a. Further, the adjustment lever 44 is formed with a flat contact portion 44b on the outer peripheral side surface on the guide hole 30a side, and the lever guide 46 is provided with a screw insertion portion 49b of an L-shaped fixing bolt 49. Screwed so as to be perpendicular to the lever 44, and by rotating the grip 49a of the fixing bolt 49, the tip of the screw 49b advances and retracts toward the abutment 44b, and is adjusted. The lever 44 is sandwiched between the inner wall 46a of the lever guide 46 and fixed at a specific position, or conversely, the lever 44 is separated from the inner wall 46a so as to be freely slidable in the longitudinal direction of the swing crank 40. Since the tip of the screw insertion portion 49b is also formed flat and can be brought into surface contact with the contact portion 44b, the adjustment lever 44 can be pressed by pressing the adjustment lever 44 with the fixing bolt 49. 44 can be stably fixed at a specific position.

  A drive shaft 50 is inserted into the shaft portion of the eccentric cam 42, and the drive shaft 50 is connected by a key 51 so as not to be relatively rotatable. Further, a collar 52 is fitted on the eccentric cam 42, and is slidably supported in the elliptical hole 40b of the swing crank 40 through the collar 52. Donut-shaped fixing members 53 and 53 are fitted, and the eccentric cam 42 and the collar 52 are fixed so as not to come out of the swing crank 40.

  Both ends of the drive shaft 50 penetrating the eccentric cam 42 protrude outwardly from the pump drive case 30 and are rotatably supported by the pump drive case 30 by bearings 54 and the like. One end of the drive shaft 50 is connected to the output shaft 24a of the motor 24 fixed to the outer surface of the pump drive case 30 via a boss 55, while the other end of the drive shaft 50 is connected to the output shaft 24a. When a pump drive device that does not include a motor is mounted, a connection structure that can transmit power to the pump drive device is formed.

  In such a configuration, the screw insertion portion 49b is rotated by holding the holding portion 49a of the fixing bolt 49, and the tip of the screw insertion portion 49b is slightly separated from the contact portion 44b on the side surface of the adjustment lever 44. When the adjustment lever 44 is pushed and pulled in the longitudinal direction of the swinging crank 40 by holding the lever operation portion 44a and is slid, the mounting portion 43a fixed to the front portion of the adjustment lever 44 has the guide hole 30a. -It slides quickly in the longitudinal direction of the swinging crank 40 while being guided by 30b, and at the same time, the fulcrum cam 41 supported by the connecting shaft 43 is also moved in a short time. The position of the fulcrum cam 41 can be easily confirmed by reading the position indicated by the pointer 48 attached to the extending end of the connecting shaft 43 with the dial 47. Then, after the fulcrum cam 41 is moved to a predetermined position using the scale plate 47 or the like, the screw insertion portion 49b is rotated in the reverse direction by holding the holding portion 49a of the fixing bolt 49, and the screw insertion portion 49b. The adjustment lever 44 can be easily fixed by pressing the front end of the adjustment lever 44 against the contact portion 44b on the side of the adjustment lever 44.

  After fixing the fulcrum cam 41 to a predetermined position, when the motors 24 are driven by turning on / off the switches 25a, 25a,..., The drive shaft 50 is rotationally driven via the output shaft 24a. The eccentric cam 42 rotates. Then, one end of the swing crank 40 slidably contacted with the outer periphery of the eccentric cam 42 reciprocates up and down, and the other end of the swing crank 40 also reciprocates up and down with the fulcrum cam 41 as a fulcrum. Thus, the diaphragm 35 connected to the other end of the swing crank 40 via the connecting rod 37 also reciprocates up and down. As a result, the valves provided in the suction port 31 and the discharge port 32 are opened and closed, and the chemical liquid suction operation and the discharge operation are repeated.

Next, the adjustment of the discharge amount will be described.
As described above, the fulcrum cam 41 slides in the long hole 40a by pushing and pulling the adjusting lever 44 and sliding, thereby changing the position of the oscillating fulcrum of the oscillating crank 40, while the eccentric cam 42. Since they cannot move, the vertical reciprocating width on the eccentric cam 42 side is constant. Accordingly, when the fulcrum cam 41 serving as the oscillating fulcrum is moved toward the eccentric cam 42, the vertical reciprocation width on the opposite side of the oscillating crank 40, that is, on the pivot shaft 39 side, is increased and sucked into the diaphragm 35. The amount of the chemical solution to be increased increases, and the discharge amount can also be increased. Conversely, when the fulcrum cam 41 serving as the swing fulcrum is separated from the eccentric cam 42, the vertical reciprocating width on the pivot shaft 39 side is shortened, the amount of the chemical liquid sucked into the diaphragm 35 is reduced, and the discharge amount is also reduced. It can be reduced.

  That is, as described above, one end of the swing crank 40 is connected to the connecting rod 37 that is a reciprocating body that drives the diaphragm pump 29 that is a reciprocating drive pump, and the eccentric cam 42 is connected to the other end of the swing crank 40. And the eccentric cam 42 is driven to rotate to cause the swinging crank 40 to perform a crank motion, and a fulcrum cam 41 serving as a swinging fulcrum is provided in the middle of the swinging crank 40 in the longitudinal direction. In the drive device 28, an adjustment lever 44 is connected to the fulcrum cam 41, and the adjustment lever 44 is slid in the longitudinal direction of the swinging crank 40 so that the position of the fulcrum cam 41 can be moved quickly. Since the discharge amount of the diaphragm pump 29 is adjusted by controlling the reciprocating motion of the connecting rod 37, the normal operation is performed in the test run before the work. The diaphragm pump 29 can be quickly set to the maximum discharge amount in order to bleed air from the suction hose 26 and discharge hose 27, which are recognition and chemical liquid hoses, eliminating the need to rotate the screw rod many times, The discharge amount can be set in a short time, and the load on the operator can be reduced. Moreover, even if it is desired to change the discharge amount suddenly during the operation, or when it is desired to stop the discharge of only the specific diaphragm pump 29, the discharge amount can be changed quickly and the supply of the chemical solution to the soil can be performed without excess or deficiency. And increase crop yield and quality.

  Further, the adjusting lever 44 is inserted into a lever guide 46 which is a guide member, and a fixing bolt 49 which is a fixing tool is provided on the lever guide 46, and the adjusting lever 44 is locked at a predetermined position by the fixing bolt 49. Therefore, the moving structure of the fulcrum cam 41, which is the oscillating fulcrum, can be formed with a simple configuration, and the parts cost of the pump drive device 28 can be reduced and the maintainability can be improved. Further, the adjustment lever 44 is securely fixed to a predetermined position by the fixing bolt 49, and the fixed position of the adjustment lever 44 is not shifted during the operation due to vibration of the traveling vehicle 2b which is a traveling machine body, and the discharge amount is predetermined. The value can be held reliably.

  The pump drive device of the present invention is a diaphragm type or plunger type reciprocating drive type for transferring various highly corrosive liquids with an accurate discharge amount in a production facility such as a chemical plant in addition to a soil disinfecting machine as illustrated. It can also be applied to driving a pump.

It is a whole top view which shows the whole structure of the tractor equipped with the soil disinfector concerning this invention. It is a perspective view of the chemical | medical solution injection | pouring part of a soil disinfection machine. It is a perspective view of the chemical | medical solution supply part of a soil disinfection machine. It is side surface partial sectional drawing of a diaphragm type chemical | medical solution delivery pump. It is side surface partial sectional drawing which shows the pump drive unit structure of a diaphragm type chemical | medical solution delivery pump. It is a bottom partial sectional view similarly. It is a back view similarly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 28 Pump drive device 29 Reciprocating drive type pump 37 Reciprocating moving body 40 Oscillating crank 41 Oscillating fulcrum 42 Eccentric cam 44 Adjustment lever 46 Guide member 49 Fixing tool

Claims (2)

  One end of a swinging crank is connected to a reciprocating moving body that drives a reciprocating drive pump, an eccentric cam is connected to the other end of the swinging crank, and the eccentric cam is driven to rotate, whereby the crank is connected to the swinging crank. In the pump drive device in which an oscillating fulcrum is provided in the middle of the oscillating crank in the longitudinal direction, an adjusting lever is connected to the oscillating fulcrum, and the adjusting lever is slid in the longitudinal direction of the oscillating crank. Thus, the pump drive apparatus is characterized in that the position of the swing fulcrum is configured to be quickly movable, and the discharge amount of the reciprocating pump is adjusted by controlling the reciprocating motion of the reciprocating moving body. The pump driving device according to claim 1, wherein the adjusting lever is inserted into the guide member, and a fixing member is provided on the guide member, and the adjusting lever is locked at a predetermined position by the fixing member.

Images