JP2011058479A - Pump drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems in installing a reciprocating drive type pump to a soil disinfection device and driving it with an oscillating crank wherein, although there is known in the past a technology of promptly changing a discharge rate by slidingly operating an adjustment lever connected to an oscillation fulcrum, the fulcrum position of the oscillation fulcrum cannot be returned correctly to the original fulcrum position when returning the discharge rate to the original discharge rate after changing the same. <P>SOLUTION: The adjustment lever 44 includes a first movable body 54 sliding in the longitudinal direction of the oscillation crank 40 for locking to a lock body 56 at multiple-step positions and a second movable body 55 sliding along the first movable body 54 for locking to the first movable body 54 at stepless positions. A fulcrum cam 41 is connected to one of ends of the second movable body 55 and a lever operating part 57 is provided at the other end of the second movable body 55. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pump drive device capable of changing a discharge amount to a predetermined value in a short time in a reciprocating pump such as a diaphragm type chemical solution delivery pump used in a soil disinfecting machine, and in particular, the discharge amount is once changed. The present invention relates to a pump drive device having a return structure that can return to the original discharge amount accurately later.

  2. Description of the Related Art 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. The reciprocating pump is driven by connecting one end of an oscillating crank to a reciprocating body such as a connecting rod provided on the diaphragm, and connecting an eccentric cam to the other end of the oscillating crank to rotate the eccentric cam. By driving, the swinging crank is caused to perform a crank motion, a swinging fulcrum is provided in the middle of the swinging crank in the longitudinal direction, an adjustment lever is connected to the swinging fulcrum, and the adjustment lever is connected to the swinging crank. A technique for quickly moving the position of the swing fulcrum by sliding in the longitudinal direction and changing the discharge amount to a predetermined value in a short time by changing the vertical reciprocating width of the reciprocating moving body is known. (For example, refer to Patent Document 1).

  According to this technology, when performing air venting in a chemical hose or the like in a test run before work or checking normal operation, the reciprocating pump can be changed to the maximum discharge amount in a short time. Thus, it is not necessary to rotate the screw rod connected to the rocking fulcrum many times in order to move the rocking fulcrum, so that it is possible to shorten the preparatory work time and the worker load. Furthermore, even if you want to change the discharge amount suddenly during work, or if you want to stop the discharge of a specific reciprocating pump only, you can change the discharge amount in a short time, and excessively supply chemicals to the soil. It is possible to increase crop yield and improve the quality of crops.

JP 2007-303279 A

In the above technique, the original discharge amount (hereinafter referred to as “reference discharge amount”) is changed to a predetermined discharge amount, and after completion of work such as air venting in the chemical solution hose and confirmation of normal operation, the reference To return to the discharge amount, read the position of the pointer connected to the swing fulcrum in advance on the dial before changing the discharge amount, and slide the adjustment lever so that the pointer comes to the read position after the work is completed. I try to operate it.
However, even if the adjustment lever is returned to the read position, the swinging fulcrum connected to the adjustment lever will not move due to the displacement of the pointer due to vibration during operation, the scale reading error on the scale plate, or the reading error. The fulcrum position cannot be accurately returned to the original fulcrum position (hereinafter referred to as “reference fulcrum position”) before the change of the discharge amount, and an error occurs in the discharge amount, resulting in variations in the chemical effect. There is a problem that the yield of crops is reduced and the quality is lowered due to the above, and the cost of chemicals is increased due to excessive chemicals.

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. Accordingly, the swinging crank is caused to perform a crank motion, and a swinging fulcrum is provided in the middle of the swinging crank in the longitudinal direction, an adjustment lever is connected to the swinging fulcrum, and the adjustment lever is connected to the longitudinal direction of the swinging crank. In the pump drive device that can quickly move the position of the oscillating fulcrum by sliding to the slidable position, the adjustment lever slides in the longitudinal direction of the oscillating crank and is engaged with the engaging body in a multistage position. And a second movable body that slides along the first movable body and can be locked to the first movable body at a stepless position, and one end of the second movable body Connect the swing fulcrum to the second movement It is provided with a lever operating portion at the other end of the.
According to a second aspect of the present invention, the first moving body and the second moving body have an inner / outer double pipe structure that is slidably disposed on a concentric shaft.
According to a third aspect of the present invention, the second moving body is inserted into the first moving body, and a locked portion that can be locked to the locking body is integrally formed on the outer periphery of the first moving body. Is provided.
In Claim 4, The mark for estimating the position of the to-be-latched part currently latched by the latching body is provided on the outer periphery of said 1st moving body, It is characterized by the above-mentioned. Pump drive.

Since this invention was comprised as mentioned above, there exists an effect shown below.
That is, in claim 1, by combining the first moving body that can be positioned in multiple stages with the locking body and the second moving body that can be positioned in a stepless manner with the first moving body, the fluctuation before the discharge amount is changed. The reference fulcrum position, which is the fulcrum position of the moving fulcrum, can accurately correspond to the locking position of the first moving body with respect to the locking body. By simply locking one moving body at the original locking position, the swing fulcrum can be quickly and accurately returned to the reference fulcrum position, preventing large errors in the discharge amount before and after changing the discharge amount. It is possible to increase the yield of crops and improve the quality by eliminating variations in effects, and to reduce the cost of chemicals by eliminating excessive chemicals.
In Claim 2, the said adjustment lever can be made into a compact structure, and the operativity and maintenance property of an adjustment lever can be improved.
In Claim 3, it is not necessary to provide the to-be-latched part separately from the first moving body, the number of parts can be reduced, the parts cost can be reduced, and the maintainability can be improved.
In claim 4, even when the locked portion cannot be confirmed because it is hidden by the locking body, the position of the locked portion can be grasped using the mark as a guide, and the first moving body is moved to the original locking position. It can be securely locked in the stop position.

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 side surface partial sectional drawing of a diaphragm type chemical | medical solution delivery pump. It is a plane partial sectional view similarly. It is a front partial sectional view similarly. It is an exploded view of an adjustment lever.

First, the whole structure of the soil disinfector 1 provided with the pump drive device concerning this invention and the tractor 2 which is a vehicle which mounts this soil disinfector 1 is demonstrated using FIG. 1 thru | or FIG. The direction indicated by the arrow F in FIG. 1 is the forward direction of the tractor 2, and the positions and directions of the members described below are based on this forward direction.
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 wheels 3 and 3 and rear wheels 4 and 4 are respectively disposed at a front portion and a rear portion of the traveling vehicle 2a. Is 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.

  Further, the mounting portion 2b includes a top link 10, a pair of left and right lower links 11, 11, and the like, and is configured to be able to be pulled by connecting various work machines to the top link 10, the lower links 11, 11. Yes. The vehicle of the soil disinfecting machine 1 may be a tiller or the like, and is not limited to such a tractor 2.

  The soil disinfecting machine 1 includes a chemical solution supply unit 1a for supplying a chemical solution and a chemical solution injection unit 1b for injecting the chemical solution into the soil. And in the chemical | medical solution injection | pouring part 1b of these, the top link mast 12 * 12 is provided in the front end, and the upper end of this top link mast 12 * 12 is connected with the rear part of the top link 10 of the mounting part 2b in the said 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 The rear ends of the lower links 11 and 11 are pivoted.

  Then, the chemical injection part 1b of the soil disinfecting machine 1 is securely connected to and supported by the mounting part 2b of the tractor 2 through the top link 10, the lower links 11 and 11, and the top link masts 12 and 12. I can do it.

  A mounting frame 15 having a rectangular shape in plan view opened rearward is fixed to the rear surfaces 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. It is rotatably supported and is configured to press the soil after the chemical solution is injected.

  Further, 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.

  In the chemical liquid supply unit 1a, a rear end of the U-shaped support frame 19 opened in front is fixed to the front part of the traveling vehicle 2a, and an upper surface of the front part of the support frame 19 is The chemical tank mounting tables 20 and 20 are fixed, and the chemical tanks 21 and 21 are mounted on the chemical tank mounting tables 20 and 20, respectively.

  Further, a support plate 22 is installed on the support frame 19, and the same number of chemical solution delivery pumps 23, 23... As the chemical solution injection nozzles 18, 18. Yes. In the present embodiment, two chemical liquid delivery pumps 23, 23,... Are provided in each of the left and right pump units 63L, 63R, and the pump units 63L, 63R are disposed immediately after the chemical liquid tanks 21, 21. They are juxtaposed in the left-right direction. Further, a connecting shaft 64 is interposed between the pump units 63L and 63R, and the driving shafts 50 of the respective chemical solution delivery pumps 23 are interlocked to each other. In the motor case 24 attached to the left pump unit 63L. .. Can be driven simultaneously by the motor power from the motor 24a.

  The chemical solution delivery pumps 23, 23... Have a diaphragm pump 29 as a reciprocating drive pump, and a pump drive device 28 for driving the diaphragm pump 29, and the pump drive device 28 is driven by the drive shaft 50. Driven. Further, the driving and stopping of the motor 24a, which is the driving source of the driving shaft 50, is performed by turning on and off the switch 25a of the motor switch panel 25 disposed on the side column 9R on the right side of the driver seat 8. I have to. In addition, such a chemical | medical solution supply part 1a may be arrange | positioned in the rear part of the tractor 2, and the arrangement position is not specifically limited.

  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,. The injection nozzles 18, 18... Are communicated with each other via discharge hoses 27, 27. In addition, the said chemical | medical solution supply part 1a may be arrange | positioned in the rear part of the tractor 2, and the arrangement position is not specifically limited.

Next, the configuration of the pump drive device 28 according to the present invention will be described with reference to FIGS. However, since the configuration of the four chemical solution delivery pumps 23 is substantially the same, only the left chemical solution delivery pump 23 of the left pump unit 63L provided with the motor case 24 will be described, and the rest will be omitted.
The pump drive device 28 is provided in a pump drive case 30 of the chemical solution delivery pump 23, and is linked to and linked to a diaphragm pump 29 of a reciprocating drive type pump provided on an upper 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.

  In the diaphragm pump 29, a diaphragm 35 composed of upper and lower members 35 a and 35 b is sandwiched and fixed by a valve mounting member 33 and a diaphragm mounting member 34 from above and below, and the diaphragm mounting 35 includes a diaphragm 35. A suction port 31 and a discharge port 32 that communicate with each other project 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 hangs down from the center lower part 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 connected to the inside of the pump drive case 30. Has been inserted.

  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, and is prevented from coming off by the fastener 38. Has been made. The swinging crank 40 has a long hole 40a on the diaphragm pump 29 side, and an elliptical hole 40b on the motor 24a side. Of these, the long hole 40a has 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 disc shape, and a connecting shaft 43 is passed through the center, and is pivotally supported by the connecting shaft 43. The right portion of the connecting shaft 43 is inserted into a guide hole 30a formed in the pump drive case 30 in the shape of a long hole. On the other hand, the diameter of the connecting shaft 43 is increased to form a large diameter portion 43a. The large diameter portion 43a is provided with a tip portion of the adjusting lever 44 so as to be orthogonal to the axis of the connecting shaft 43. The needle 48 is attached to the left end of the large diameter portion 43a. The pointer 48 is inserted into a guide hole 30b formed in the shape of a long hole in the left side surface of the pump drive case 30, and the left side surface of the pump drive case 30 extends along the guide hole 30b. In addition, a scale plate 47 provided with a scale 47a for reading the position of the pointer 48 is also fixed. Further, the guide holes 30a and 30b are arranged in parallel to each other on the left and right of the pump drive case 30, and are also arranged in parallel with the adjusting lever 44.

  The drive shaft 50 is inserted into the shaft center 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, the eccentric cam 42 is fitted with a collar 52 and is slidably supported in the elliptical hole 40b of the swing crank 40 via the collar 52. The doughnut-shaped fixing members 53 and 53 are fitted, whereby the eccentric cam 42 and the collar 52 are fixed so as not to come out of the swing crank 40.

  The left end of the drive shaft 50 penetrating the eccentric cam 42 protrudes to the left outward from the pump drive case 30, and the motor 24 a fixed to the left side surface of the pump drive case 30 is illustrated at the protruding end. The output shaft is connected so that the motor power from the motor 24a can be transmitted to the drive shaft 50.

  In such a configuration, when the adjustment lever 44 is pushed and pulled in the longitudinal direction of the swinging crank 40 and is slid, the large-diameter portion 43a of the connecting shaft 43 fixed to the front portion of the adjustment lever 44 becomes the guide. While being guided by the holes 30a and 30b, the swinging crank 40 is slid quickly in the longitudinal direction, and at the same time, the fulcrum cam 41 supported by the connecting shaft 43 is also moved in a short time.

  After the fulcrum cam 41 is moved, when the switch 24a is turned on to drive the motor 24a, the drive shaft 50 is driven to rotate and 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 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 alternately repeated.

  At this time, if the fulcrum cam 41 serving as the oscillating fulcrum is moved toward the eccentric cam 42, the vertical reciprocating width on the pivot shaft 39 side becomes long, and the amount of the chemical solution sucked into the diaphragm 35 increases. The discharge amount can also be increased. Conversely, when the fulcrum cam 41 serving as the oscillating fulcrum is separated from the eccentric cam 42, the vertical reciprocating width on the pivot shaft 39 side is shortened, and the chemical solution sucked into the diaphragm 35 The amount of ink can be reduced, and the discharge amount can also be reduced.

Next, the structure of the adjusting lever 44 and the return configuration to the reference fulcrum position will be described with reference to FIGS.
A lever guide 46 is fastened and fixed to the front left corner of the pump drive case 30 by upper and lower bolts 62 and 62, and the adjustment lever 44 is mounted on a boss portion 46 a having an axial center in the front-rear direction. The middle part of is inserted. The adjusting lever 44 includes a pipe-shaped first moving body 54 inserted so as to be in contact with the boss portion 46a, and a rod-shaped moving body 54 inserted on the first moving body 54 and disposed on a concentric axis. The second moving body 55 and a lever operating portion 57 provided at the rear end of the second moving body 55 are configured.

  Among these, the first moving body 54 is provided with a large and long large-diameter hole 54a occupying most of the first moving body 54 and a screw portion smaller and shorter than the large-diameter hole 54a in order from the rear. A medium diameter screw hole 54b is formed. Further, the outer diameter of the first moving body 54 is formed to be substantially the same diameter as the boss hole 46 d provided in the boss portion 46 a of the lever guide 46, and a mortar-like shape is formed on the outer peripheral upper surface of the first moving body 54. A plurality of the locking recesses 54c are formed integrally with the upper wall portion of the first moving body 54 at a plurality of positions at predetermined intervals. A plurality of ring groove-shaped marks 54d are provided in the front-rear direction at predetermined intervals on the outer periphery of the first moving body 54 so as to pass through substantially the center of the locking recess 54c, and five in this embodiment. Is formed.

  The second moving body 55 includes a medium diameter portion 55a, a large diameter portion 55b that is thicker than the medium diameter portion 55a, a medium diameter portion 55c that is substantially the same diameter and long as the medium diameter portion 55a, and the medium diameter portion. An intermediate diameter screw portion 55d having a diameter substantially the same as that of the portion 55c and a short screw portion, and a small diameter screw portion 55e which is narrower than the intermediate outer diameter screw portion 55d and substantially the same diameter as the screw hole 57a of the lever operating portion 57 are formed. ing.

  In the adjustment lever 44 according to the present invention, the second moving body 55 having the small diameter screw portion 55e first is inserted into the large diameter hole 54a of the first moving body 54, and the medium diameter screw portion 55d of the second moving body 55 is inserted. The second moving body 55 is screwed into the middle diameter screw hole 54b of the first moving body 54 and protruded forward, and then the fine adjustment bolt 58 is screwed into the protruding portion of the middle diameter screw portion 55d. Fastened to the first moving body 54. Further, the small-diameter screw portion 55e at the tip of the medium-diameter screw portion 55d is screwed into the screw hole 57a of the lever operation portion 57 and protrudes forward, and the fixing bolt 59 is screwed into the protruding portion of the small-diameter screw portion 55e. By doing so, the lever operating portion 57 is fastened to the second moving body 55 so as to be pressed by the stepped portion 55f between the medium diameter screw portion 55d and the small diameter screw portion 55e.

  On the other hand, the adjusting lever 44 is fixed by a locking body 56 inserted perpendicularly to the boss portion 46a of the lever guide 46. The locking body 56 is formed at the tip of the knob portion 56a, a screw portion 56c screwed into the knob portion 56a and fastened and fixed to the knob portion 56a by upper and lower fixing nuts 56b and 56b. The conical locking convex portion 56d is formed, and a fixing hole 46b is formed in the radial direction at the upper portion of the boss portion 46a of the lever guide 46.

  In the configuration as described above, when returning to the reference fulcrum position after performing operations such as venting the inside of the chemical solution hose and confirming normal operation, first, first, before the operation, the first of the adjustment lever 44 is adjusted. By sliding the moving body 54 and fixing it to the locking body 56 at a predetermined position, an approximate reference fulcrum position is set, and subsequently, the second moving body 55 of the adjustment lever 44 is rotated to be at the predetermined position. By tightening the fine adjustment bolt 58, the reference fulcrum position is finely adjusted and the accurate position is recorded on the adjustment lever 44. Then, only the locking body 56 is removed and the operation is performed. After the operation, the fulcrum cam 41 can be accurately returned to the reference fulcrum position simply by returning the first moving body 54 of the adjustment lever 44 to the original position with the locking body 56, and the original discharge amount is accurate. So that it can be discharged.

  Specifically, the lever operating portion 57 of the adjusting lever 44 is gripped, the first moving body 54 is inserted into the boss hole 46d of the lever guide 46 and slid, and the adjusting lever 44 is slid toward the fulcrum cam 41. At the same time, by gripping the knob portion 56a of the locking body 56 and screwing the screw portion 56c of the locking body 56 into the fixing hole 46b of the lever guide 46, the locking protrusion at the tip of the screw portion 56c 56d can be locked with a predetermined locking recess 54c of the first moving body 54 in the boss hole 46d so that the first moving body 54 can be locked with respect to the locking protrusion 56d at a multistage position. Yes.

  Subsequently, in a state where the fine adjustment bolt 58 is loosened so that the lever operating portion 57 can be rotated, the lever operating portion 57 is gripped and rotated, and the medium diameter screw portion 55d of the second moving body 55 is moved to the first position. The second moving body 55 is moved toward the fulcrum cam 41 at the reference fulcrum position by rotating in the medium diameter screw hole 54b of the one moving body 54, and the intermediate diameter portion 55a of the rear end of the second moving body 55 is reached. Is engaged with the large-diameter portion 43 a of the connecting portion 43. Thereafter, when the loosened fine adjustment bolt 58 is tightened to fix the second moving body 55 to the first moving body 54, a predetermined locking recess for locking to the locking body 56 from the fulcrum cam 41 at the reference fulcrum position. A length 61 (hereinafter referred to as “reference length”) 61 up to 54c is fixed. In this way, the second moving body 55 can be locked to the first moving body 54 at a continuously variable position.

  Then, when performing work such as venting the inside of the chemical solution hose or confirming normal operation, the screw 56c of the locking body 56 is loosened and removed from the locking recess 54c of the first moving body 54, and then adjusted. A slide operation is performed by pushing and pulling the lever 44. After the operation, the first moving body 54 of the adjustment lever 44 is inserted into the boss hole 46d of the lever guide 46 and slides using the adjustment lever 44 having the reference length recorded as described above. The predetermined locking recess 54c of the first moving body 54 is locked again with the locking projection 56d of the locking body 56. As a result, the reference length 61 can be quickly reproduced, the reference fulcrum position can be accurately matched to the locking position of the first moving body 54 to the locking body 56, and the position of the fulcrum cam 41 can be quickly and accurately set. It is possible to return to the reference fulcrum position.

  By providing such a returning structure, even if the position of the pointer 48 cannot be sufficiently read by the scale plate 47 because the reference fulcrum position is between the scales 47a of the scale plate 47, the fulcrum cam 41 is provided. Can be returned to the correct reference fulcrum position. When the adjustment lever 44 is slid toward the fulcrum cam 41, the above-described mark 54d is provided, and the lock projection 56d of the lock body 56 has a predetermined engagement with the mark 54d as a guide. It is possible to confirm whether or not the locking portion 54c is locked.

  Further, when the medium-diameter screw portion 55d of the second moving body 55 is rotated in the medium-diameter screw hole 54b of the first moving body 54 with the fine adjustment bolt 58 loosened, the second moving body 55 and the second moving body 55 together. Front and rear locking bolts 60 and 60 are provided on the boss portion 46a of the lever guide 46 so that the first moving body 54 does not rotate. The boss portion 46a is provided with front and rear anti-rotation holes 46c and 46c in the radial direction so as to face the fixing hole 46b, and the anti-rotation bolts 60 and 60 are provided in the anti-rotation holes 46c and 46c. Screw portions 60a and 60a are screwed.

  Then, the tips of the threaded portions 60a and 60a are brought into contact with the outer peripheral surface of the first moving body 54 in the boss hole 46d on the side opposite to the locking recess 54c, so that the first moving body 54 is brought together. It prevents the rotation. In the present embodiment, the outer peripheral surface of the first moving body 54 with which the tips of the screw portions 60a and 60a abut remains a curved surface, but only the outer peripheral portion with which the abutment comes into contact is processed into a flat surface so that the screw portions 60a and 60a The contact area with the tip may be increased to increase the rotational resistance, and the shape and configuration of the contact portion are not particularly limited as long as the first moving body 54 can be reliably prevented from being rotated. .

  That is, one end of a swinging crank 40 is connected to a connecting rod 37 that is a reciprocating moving body that drives a diaphragm pump 29 that is a reciprocating drive pump, and an eccentric cam 42 is connected to the other end of the swinging crank 40, The eccentric cam 42 is rotationally driven to cause the swing crank 40 to perform a crank motion, and a fulcrum cam 41 serving as a swing fulcrum is provided in the middle of the swing crank 40 in the longitudinal direction. In the pump drive device 28 that can move the position of the fulcrum cam 41 by connecting the lever 44 and sliding the adjusting lever 44 in the longitudinal direction of the swinging crank 40, the adjusting lever 44 is A first moving body 54 that slides in the longitudinal direction of the swing crank 40 and can be locked to the locking body 56 at multiple positions, and slides along the first moving body 54. A second moving body 55 that can be locked to the first moving body 54 in a continuously variable position; and the fulcrum cam 41 is connected to one end of the second moving body 55, and the other end of the second moving body 55 Since the lever operating portion 57 is provided, the first moving body 54 that can be positioned in multiple stages is combined with the locking body 56 and the second moving body 55 that can be positioned in a stepless manner. The reference fulcrum position, which is the fulcrum position of the fulcrum cam 41 before changing the discharge amount, can be made to correspond exactly to the locking position of the first moving body 54 to the locking body 56, and even after the discharge amount is changed, the lever The fulcrum cam 41 can be quickly and accurately returned to the reference fulcrum position by simply pushing and pulling the operating portion 57 to lock the first moving body 54 at the original locking position, and discharging before and after changing the discharge amount. Prevents large errors in volume and eliminates variations in chemical effects With improved growth and quality of crop yield of the object, it is possible to reduce chemical cost by eliminating the chemical excessive.

  Further, since the first moving body 54 and the second moving body 55 have an inner / outer double pipe structure arranged on concentric shafts so as to be slidable with each other, the adjustment lever 44 can be made compact. The operability and maintainability of the adjusting lever 44 can be improved.

  In addition, the second moving body 55 is inserted into the first moving body 54, and a locked portion that can be locked to the locking body 56 is provided on the outer periphery of the first moving body 54. Since the locking recess 54c is provided integrally, it is not necessary to provide the locking recess 54c separately from the first moving body 54, the number of parts can be reduced, and the cost of parts and the maintenance are improved. be able to.

  And since the mark 54d for estimating the position of the latching recessed part 54c which is a to-be-latched part latched by the latching body 56 is provided on the outer periphery of the said 1st moving body 54, a latching recessed part is provided. Even when 54c is hidden by the locking body 56 and cannot be confirmed, the position of the locking recess 54c can be grasped by using the mark 54d as a guide, and the first moving body 54 can be reliably brought to the original locking position. Can be locked.

  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.

28 Pump drive device 29 Diaphragm pump (reciprocating pump)
37 Connecting rod (reciprocating body)
40 oscillating crank 41 fulcrum cam (oscillating fulcrum)
42 Eccentric cam 44 Adjustment lever 54 First moving body 54c Locking recess (locked portion)
54d Mark 55 Second moving body 56 Locking body 57 Lever operation section

Claims (4)

  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. By moving the swinging fulcrum in the middle of the swinging crank in the longitudinal direction, connecting the adjusting lever to the swinging fulcrum, and sliding the adjusting lever in the longitudinal direction of the swinging crank, In the pump drive device capable of quickly moving the position of the swing fulcrum, the adjustment lever slides in the longitudinal direction of the swing crank and can be locked to the locking body in a multistage position; and A second moving body that slides along the first moving body and can be locked to the first moving body at a stepless position, and the swing fulcrum is connected to one end of the second moving body. The lever operating part is provided at the other end of the second moving body. Pump drive, wherein the door.   2. The pump drive device according to claim 1, wherein the first moving body and the second moving body have an inner / outer double pipe structure that is slidably disposed on a concentric shaft.   The second moving body is inserted into the first moving body, and a locked portion that can be locked to the locking body is integrally provided on the outer periphery of the first moving body. The pump drive device according to claim 1 or 2.   The pump drive device according to claim 3, wherein a mark for estimating a position of a locked portion locked to the locking body is provided on an outer periphery of the first moving body.

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