JP3871235B2 - Plunger pump drive device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drive device that drives a plunger pump that pumps a highly viscous liquid such as paint.
[0002]
[Prior art]
As shown in FIG. 5, the conventional paint supply device used in the coating system is, for example, a pump air cylinder device M (hereinafter referred to as a conventional drive device) communicated with an air source Q4 such as an external air compressor. And a plunger pump P disposed below the conventional driving device M. A conventional paint supply device, particularly a conventional drive device M will be described below with reference to FIGS.
[0003]
The conventional driving device M supports a cylindrical cylinder body A of the plunger pump P via a support member N5 at the lower part, and a check valve A1 is disposed at the lower end of the cylinder body A. An inflow portion for paint or the like is formed. Further, from the upper end of the cylindrical body A, the tip of a plunger rod B1 connected to the piston rod n10 that moves up and down in the conventional driving device M is fitted. Furthermore, a piston internal piston part B2 that forms an internal flow path in which a check valve B6 is disposed is formed at the tip of the plunger rod B1, and a packing structure is provided on the outer periphery of the pump internal piston part B2. The body B8 is assembled to prevent the paint from leaking when the plunger pump P is operated.
[0004]
As shown in FIG. 4, the conventional driving device M that operates the plunger pump P has a piston portion N2 housed in a cylinder chamber N1 provided with air supply / discharge pipes N3 and N4 at upper and lower ends. A piston rod n10 is formed on the lower surface of the piston portion N2, and a detection rod n9 is formed on the upper surface. Further, an engagement piece J3 is provided at the upper end of the detection rod n9. The upper and lower limit switches J1 and J2 detect that the engagement piece J3 has reached the limit position in each of the upper and lower directions. A detection signal is sent to the air circuit Q (see FIG. 5). By this signal, supply / exhaust of air sent into the cylinder chamber N1 is controlled, and reciprocation of the piston portion N2 is controlled. That is, the reciprocating motion of the piston portion N2 is controlled to operate the plunger pump P connected below.
[0005]
As shown in FIG. 5, the air circuit Q has a flow path of the compressed air sent from the air source Q4 to the cylinder chamber N1 with either the upper chamber n6 side or the lower chamber n7 side by switching the master valve Q3. This is an air circuit.
The master valve Q3 is switched by either the first switching valve Q1 receiving the detection signal from the upper limit switch J1 or the second switching valve Q2 receiving the detection signal from the lower limit switch J2. It works by sending compressed air from the air source Q4 to the master valve Q3.
[0006]
More specifically, when the detection rod n9 is raised, the engagement piece J3 pushes up the upper limit switch J1 (see FIG. 4A), and as a result, the detection signal is sent from the upper limit switch J1 to the first switching valve Q1. Reach. Then, the 1st switching valve Q1 opens and the compressed air of the air source Q4 is sent to the master valve Q3. Then, the master valve Q3 is switched to one side, the compressed air from the air source Q4 is supplied to the upper chamber n6 side in the cylinder chamber N1, and the piston portion N2 starts to descend (forward). On the other hand, when the engagement piece J3 pushes down the lower limit switch J2 due to the lowering (forward movement) of the piston portion N2 (see FIG. 4B), the detection signal is sent from the lower limit switch J2 to the second switching valve Q2. Reach. Then, the second switching valve Q2 is opened, and the compressed air from the air source Q4 is sent to the master valve Q3. Then, the master valve Q3 is switched to the other side, and the compressed air from the air source Q4 is now supplied to the lower chamber n7 side in the cylinder chamber N1, and the piston portion N2 starts to rise (return). .
[0007]
The above operation is repeated, and the piston portion N2 continues to reciprocate, and this reciprocation is transmitted to the plunger rod B1 in the plunger pump P and the in-pump piston portion B2 formed at the tip thereof. Then, by this reciprocation, pressure is generated in the plunger pump P, and paint or the like is sucked into the cylinder moving part A from the paint tank PT (liquid supply source) arranged outside, and the plunger part 3 It is sent out to an external flow path OUT that leads to a coating gun or the like through an internal flow path formed at the tip portion and a liquid flow hole b12.
[0008]
[Problems to be solved by the invention]
(1) However, the conventional driving device M described above has been described. The The detection rod n9 formed on the upper surface of the ston portion N2 slidably passes through the upper sliding hole n3 of the upper cover n1 constituting the cylinder chamber N1, but the tip of the detection rod n9 is a free end. Therefore, as shown in FIG. 6, the core swing is likely to occur due to the vertical movement, and as a result, uneven wear is likely to occur.
In order to eliminate such uneven wear, it is necessary to replace the upper cover n1, and it is difficult to perform appropriate adjustment to maintain the pumping efficiency. In particular, when the object to be pumped is a paint or the like, the coating accuracy is lowered and the inconvenience is large.
[0009]
(2) Further, in the conventional air circuit Q, if the air pressure of the air source Q4 is not used at the end of work, the master valve Q3 may become free and the valve position may shift. In particular, if the valve position shifts to the neutral position, air will not be supplied from the master valve Q3 to the cylinder chamber N1 side even if the air pressure is restored at the start of work, causing malfunction in the plunger pump P, resulting in poor accuracy in painting, etc. It caused the cause.
(3) Further, in the conventional driving device M, water condensation due to latent heat occurs on the outer peripheral surface due to the compressed air. Normally, it is usual to concentrate various devices in one place to save space, but especially when a paint tank is placed under the paint supply device to save space. For example, the condensed water dropped into the paint tank, resulting in poor coating accuracy.
The present invention is directed to avoiding the above problems, and relates to a drive device for driving a plunger pump that pumps high-viscosity liquid such as paint, and improves the pumping efficiency and pumping of the high-viscosity liquid. The purpose is to maintain the accuracy of.
[0010]
[Means for Solving the Problems]
The present invention Both The detecting means formed on one rod side of the rod type double acting cylinder detects the reciprocation limit position of the piston portion in the double rod type double acting cylinder, and the air circuit receiving the signal from this detecting means, In a plunger pump drive device that controls a reciprocating motion of the piston portion and operates a plunger pump disposed on the other rod side, a wall surface of a cylinder chamber in which a through hole through which the one rod is inserted is formed, and the wall surface A cover portion that is detachably attached from the outside, and a slide hole that is formed in the cover portion and has a smaller diameter than the through hole, and into which one rod inserted into the through hole is slidably fitted. It is also possible to provide a plunger pump drive device characterized by having the above-mentioned features, and in particular, it is possible to provide a feature that the tip of the one rod is a free end.
[0011]
Furthermore, the air circuit includes: a first piping portion that communicates one cylinder chamber and an air source among cylinder chambers partitioned by a piston portion in the double rod double acting cylinder; and the other cylinder chamber. First and second pipes connected to the air source and first and second switching valves operating by detecting the reciprocation limit position of the piston part by the detecting means. The control pipe and the first and second control pipes are connected to one or the other switching part, and by the flow of compressed air from the control pipe, the first pipe part or the second pipe part A master valve that selects one of them as a flow path for compressed air, and a third piping section that communicates one side or the other side switching section of the master valve with the air source. It can also be characterized in that it consists of a manual valve that was. And it can also be characterized by having a condensed water saucer arranged around the lower part of the double rod type double acting cylinder.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a plunger pump driving device according to the present invention, in which (a) shows a state where the piston portion has reached the lower limit position, and (b) shows a state where the piston portion has reached the upper limit position. is there. FIG. 2 is a schematic diagram and an air circuit diagram of a paint supply device including a plunger pump and a plunger pump driving device, and FIG. 3 is a partially enlarged longitudinal sectional view showing an upper cover of the plunger pump driving device. 4A and 4B are longitudinal sectional views of a conventional drive device, in which FIG. 5A shows a state in which the piston portion has reached the lower limit position, FIG. 4B shows a state in which the piston portion has reached the upper limit position, and FIG. FIG. 6 is a partially enlarged longitudinal sectional view showing an upper cover of a conventional drive device, and FIG. 6 is a schematic view of a paint supply device including a pump and a conventional drive device.
[0013]
The main part of the plunger pump drive device 100 (hereinafter referred to as drive device) according to the present embodiment is composed of a double rod type double acting cylinder 120 (hereinafter referred to as air cylinder portion), and constitutes a part of the paint supply device. . Accordingly, first, the outline of the paint supply device will be described based on FIG. 2, and the details of the driving device 100 will be described hereinafter.
The paint supply device is configured such that the plunger pump 1 is disposed below the driving device 100 shown in FIG. 2 via a support member 125, and the plunger portion 3 of the plunger pump 1 is connected to the reciprocating piston portion 122 of the driving device 100. Are connected.
[0014]
More specifically, the lower end of the support member 125 provided at the lower part of the driving device 100 is fixed to the upper cover part 4 of the plunger pump 1, and the cylindrical tube body part 20 is fitted into the upper cover part 4 and screwed together. Further, the lower lid portion 6 is fitted into the lower end portion of the cylindrical body portion 20 and is fixed by screwing. That is, the upper cover part 4, the cylinder body part 20, and the lower cover part 6 constitute the cylinder part 2.
In addition, a plunger rod 31 constituting a part of the plunger portion 3 is fitted into the cylinder portion 2, and in particular, an in-pump piston portion 32 formed at the tip of the plunger rod 31 slides in the cylinder body portion 20. Move. Further, a packing structure 33 is assembled on the outer periphery of the piston part 32 in the pump to prevent paint leakage and the like during the pump operation.
Furthermore, an internal flow path that connects the internal inlet 32a and the fluid passage hole 36d is formed in the in-pump piston portion 32, and a check valve 37 is disposed in the internal flow path. On the other hand, a check valve 21 is provided in the lower lid portion 6 and an inflow passage communicating with the high viscosity liquid supply source PT is formed.
[0015]
Accordingly, when the plunger portion 3 reciprocates in the cylinder portion 2, paint or the like that is a highly viscous liquid is supplied to the supply source PT, the lower portion of the cylindrical moving portion 20, the inner flow path, and the upper portion of the cylindrical moving portion 20. From there, it passes through a discharge hole (not shown) provided in the upper lid portion 4 and is discharged to an external flow path OUT that communicates with a coating gun or the like.
[0016]
Next, details of the driving device 100 will be described with reference to FIG. The driving device 100 in the present embodiment reciprocates the piston portion 122 by appropriately supplying and exhausting air to and from the upper chamber 121f or the lower chamber 121g sandwiching the piston portion 122 housed in the cylinder chamber 121. A detection rod 122 a is attached to the upper surface of the piston portion 122, and a piston rod 122 b is attached to the lower surface, and the tip of the piston rod 122 b is connected to the base end of the plunger rod 31. The detection rod 122a is provided with detection means 110 for detecting that the piston portion 122 has reached the upper limit position and the lower limit position, and receives the detection signal sent from the detection means 110 in response to the detection signal. In the upper chamber 121f or the lower chamber 121g, an air circuit 130 for controlling the reciprocation of the piston portion 122 by appropriately supplying and exhausting compressed air from the air source 134 (see FIG. 2) is formed.
In other words, the driving device 100 includes an air cylinder portion 120 (double rod double acting cylinder) constituted by the cylinder chamber 121 and the piston portion 122, a detection means 110, and an air circuit 130.
[0017]
First, the air cylinder part 120 is demonstrated based on FIG.
In the air cylinder portion 120, a cylinder tube 121h is sandwiched between an upper cover 121a and a lower cover 121b, and is fastened and fixed by stud bolts 121j and 121k to constitute a cylinder chamber 121. A piston portion is provided in the cylinder chamber 121. Include 122. Further, compressed air flows from the air supply / discharge pipe 123 into the upper chamber 121f in the cylinder chamber 121 and sandwiching the piston portion 122, and compressed air flows from the air supply / discharge pipe 124 into the lower chamber 121g. .
In the piston portion 122, a piston rod 122b connected to the plunger rod 31 is formed on the lower surface side, and a detection rod 122a is formed on the upper surface side. The piston rod 122b is slidably inserted into a lower sliding hole 121d provided in the lower cover 121b and connected to the plunger rod 31. Air leakage from the cylinder chamber 121 is caused in the lower sliding hole 121d. In order to prevent this, the packing member 121e is disposed.
[0018]
On the other hand, the upper cover 121a constituting the cylinder chamber 121 is provided with a through hole 121c through which the detection rod 122a is inserted, and the cover portion 150 is bolted 152 to the outside (outer wall surface) of the cylinder chamber 121 on the through hole 121c. Removably attach by. The cover portion 150 is formed with a slide hole 153 having a diameter through which the detection rod 122a can be fitted, and the center line of the slide hole 153 and the through hole 121c is the same during the attachment. To. Accordingly, the detection rod 122a provided on the upper surface side of the piston part 122 is inserted into the through hole 121c and slides in the sliding hole 153. A packing member 121i is disposed in the through hole 121c, and a spring washer 151 is disposed in the sliding hole 153 to prevent air leakage due to vertical movement (reciprocation) of the detection rod 122a.
[0019]
The sliding hole 153 has a smaller diameter than the through hole 121c. In the present embodiment, the leading end of the detection rod 122a is a free end, and therefore, core deflection is likely to occur when reciprocating. This center runout causes uneven wear in the cylinder chamber. In the present embodiment, since the shaft diameter of the slide hole 153 is smaller than the through hole 121c as described above, only the portion of the slide hole 153 wears unevenly. In that case, if only this cover part 150 is replaced, the inconvenience due to the uneven wear is eliminated, so that repair and the like can be carried out appropriately and promptly, and maintenance of the accuracy of painting and the like can be actively carried out. It is economical because only the cover part 150 needs to be replaced.
[0020]
Further, the piston rod 122b and the detection rod 122a have the same diameter so that the upper surface pressure receiving area and the lower surface pressure receiving area of the piston portion 122 are the same. As a result, the compressed air acting on the upper surface pressure receiving area and the lower surface pressure receiving area of the piston portion 122 acts on the upper surface and the lower surface of the piston portion 122 with the same pressure, thereby suppressing the occurrence of pulsation.
In FIG. 1, a basin-shaped water-condensing tray 140 is formed around the lower end of the lower cover 121b. This is because, when compressed water is generated due to latent heat on the outer peripheral surface of the air cylinder 120 due to the compressed air, the water is received.
[0021]
Next, the detection unit 110 and the air circuit 130 that receives the signal from the detection unit and controls the reciprocation of the piston part 122 will be described with reference to FIGS. 1 and 2.
The detection rod 122a is provided with an engagement piece 110c at the upper end, and the engagement piece 110c is engaged and kicked when it reaches the upper limit position on the movement trajectory moving up and down. In addition, the upper limit switch 110a is externally held, and the lower limit switch 110b is externally held at the position where the engagement piece 110c engages and kicks when the lower limit position is reached on the movement trajectory. Arrange. The upper limit switch 110a and the lower limit switch 110b send a detection signal to the first switching valve 131 or the second switching valve 132 when the engaging piece 110c is engaged, and the switching valve 131, which receives the detection signal, 132 opens and sends compressed air to the master valve 133. That is, the upper limit switch 110a, the lower limit switch 110b, and the engagement piece 110c constitute the detection means 110.
[0022]
The air circuit 130 will be described in detail below with reference to FIG.
First, the operating portion of the first switching valve 131 that operates in response to a detection signal from the upper limit switch 110a has an air pipe (1) connected to the IN side and an air pipe (2) connected to the OUT side. (1) communicates with an air source 134 such as a compressor, and air piping (2) communicates with one side of the switching portion of the master valve 133.
On the other hand, the operating portion of the second switching valve 132 that operates in response to a detection signal from the lower limit switch 110b has an air pipe (6) connected to the IN side and an air pipe (7) connected to the OUT side. The pipe (6) communicates with the air source 134, and the air pipe (7) communicates with the other side of the switching portion of the master valve 133.
That is, the air pipe (1) and the air pipe (2) constitute a first control pipe, and the air pipe (6) and the air pipe (7) constitute a second control pipe.
[0023]
One side of the master valve 133 is connected to the air piping (4) on the IN side and to the air piping (5) on the OUT side. On the other hand, the other side of the master valve 133 is connected to the air pipe (4) on the IN side and the air pipe (8) on the OUT side. The air pipe (5) and the air pipe (8) communicate with the air supply / exhaust pipe 123 and the air supply / exhaust pipe 124, respectively, and the air pipe (4) communicates with the air source 134.
Accordingly, the air pipe (4) and the air pipe (8) constitute the first pipe part, and the air pipe (4) and the air pipe (5) constitute the second pipe part. Therefore, when compressed air flows into one side or the other side of the switching portion of the master valve 133, this switching portion is activated, and either the first piping portion or the second piping portion is selected as a compressed air flow path. To do.
[0024]
In the present embodiment, the air pipe {circle around (9)} communicating with the air source is connected to the air pipe {circle around (2)} via the manual valve 135. That is, the air pipe {circle over (9)} and the air pipe {circle around (2)} correspond to the third pipe portion, and the manual valve 134 is disposed in the middle of the third pipe portion. Usually, when the manual valve 135 is opened, no flow path is formed in the third piping portion. However, by closing the manual valve 135, the flow path of the third piping section is connected, and compressed air is sent from the air source 134 to one side of the switching section of the master valve 133. As a result, the master valve 133 is switched to one side, and the first piping portion becomes a compressed air flow path.
Therefore, when the air cylinder 120 is operated from the state where the air pressure is not applied, even if the master valve 134 is not operated because the switching portion is in the neutral position, the manual valve 135 is forcibly closed. A compressed air flow path is formed in one piping section, and malfunctions can be eliminated.
The third piping portion and the manual valve 135 are not limited to the above arrangement, and the second piping portion may be a compressed air flow path by closing the manual valve 135.
[0025]
Next, the operation of the driving device 100 will be described based on FIGS. 1 and 2 in consideration of the relationship with the plunger pump 1.
First, an air source such as a compressor is driven from a state where there is no air pressure, and the manual valve 135 is closed. Then, a compressed air flow path is forcibly formed in the third piping section and the second piping section, and compressed air flows into the upper chamber 121j from the air supply / discharge pipe 123 as shown in FIG. The piston part 122 starts to descend (forward movement). When the air cylinder unit 120 is activated, the manual valve 135 is opened to cut off the flow path of the third piping unit.
[0026]
When the piston part 122 continues to move forward and reaches the forward movement limit position, the engagement piece 110c formed on the detection rod 122a engages with the lower limit switch 110b. Then, as shown in FIG. 2, the second switching valve 132 is actuated to form a flow path in the second control piping, and the compressed air flows into the other side of the switching portion of the master valve 133. Switch the compressed air flow path to the piping. As a result, as shown in FIG. 1B, compressed air flows into the lower chamber 121g from the air supply / exhaust pipe 124, and air escapes from the air supply / exhaust pipe 123, and the piston 122 starts to rise (return). .
[0027]
When the piston portion 122 continues to return and reaches the return limit position, the engagement piece 110c is engaged with the upper limit switch 110a, and the first switching valve 131 is operated as shown in FIG. A flow path of compressed air is formed in the control pipe. Then, compressed air flows into one side of the switching portion of the master valve 133, and the flow path of the compressed air is switched from the second piping portion to the first piping portion. As a result, as shown in FIG. 1A, compressed air flows into the upper chamber 121j from the air supply / exhaust pipe 123, and air is released from the air supply / exhaust pipe 124 so that the piston 122 starts to descend (forward) again. To do.
[0028]
The above operation is repeated and the piston 122 continues to reciprocate. In addition, since the shaft diameters of the detection rod 122a and the piston rod 122b provided in the piston portion 122 are the same, the pressure receiving pressure on the surface (upper surface) on the upper chamber 121j side and the surface (lower surface) on the lower chamber 121g side of the piston portion 122. The area is the same. Therefore, even when the reciprocating motion of the piston portion 122 is transmitted to the plunger portion 3 via the piston rod 122b, and the highly viscous liquid is pumped by the reciprocating motion of the plunger portion 3, the pumping pressure generated by the forward and backward motions is It becomes the same and suppresses pulsation.
[0029]
In addition, since the detection rod 122a has a free end, it is likely to cause a core runout due to the reciprocating motion of the piston portion 122. Therefore, the sliding hole 153 formed in the cover portion 150 is worn away by this core runout. However, since the cover 150 is detachable from the upper cover 121a constituting the cylinder chamber 121, the cover 150 is appropriately replaced and replaced as shown in FIG.
[0030]
The plunger pump 1 is operated by the operation of the driving device 100 described above. That is, when the piston part 122 of the driving device 100 reciprocates, the plunger part 3 reciprocates, and by this reciprocation, a highly viscous liquid such as paint is sucked into the cylinder moving part 20 from the supply source PT, and the plunger The highly viscous liquid is pumped by being discharged from the internal flow path formed at the distal end portion of the section 3 and the discharge hole (not shown) formed in the upper lid section 4 to the external flow path OUT.
[0031]
【The invention's effect】
The effect of the drive device according to the present invention will be described.
(1 Both One rod in a rod-type double acting cylinder fits into a sliding hole formed in the cover part, and this cover part is detachably attached to the outside of the cylinder chamber. This prevents the cylinder chamber from being worn, and on the other hand, if the cover portion is worn, it can be easily repaired by replacing it appropriately.
(2) When the third piping part and the manual valve are formed in the air circuit, the compressed air flow path is surely formed in either the first piping part or the second piping part when the air source is driven. Since the moving cylinder is operated, malfunction of the plunger pump can be prevented.
(3) By arranging a water-condensing tray, even when water is condensed due to the influence of compressed air, this water may affect other equipment, or it may fall into the paint tank and cause inaccuracies such as painting. Prevent inconvenience.
[Brief description of the drawings]
1A and 1B are longitudinal sectional views of a plunger pump driving device according to the present invention, in which FIG. 1A is a state diagram in which a piston portion has reached a lower limit position, and FIG. .
FIG. 2 is a schematic diagram and an air circuit diagram of a paint supply device including a plunger pump and a plunger pump driving device.
FIG. 3 is a partially enlarged longitudinal sectional view showing an upper cover of a plunger pump driving device.
4A and 4B are longitudinal sectional views of a conventional drive device, in which FIG. 4A is a state diagram in which a piston portion has reached a lower limit position, and FIG. 4B is a state diagram in which the piston portion has reached an upper limit position.
FIG. 5 is a schematic diagram and an air circuit diagram of a paint supply device including a plunger pump and a conventional drive device.
FIG. 6 is a partially enlarged longitudinal sectional view showing an upper cover of a conventional drive device.
[Explanation of symbols]
100: Plunger pump drive device (drive device)
110: Detection means
110a: Upper limit switch
110b: Lower limit switch
110c: engagement piece
120: Double rod double acting cylinder (air cylinder part)
121: Cylinder chamber
121a: upper cover
121b: lower cover
121c: Through hole
121d: Lower sliding hole
121e, 121i: packing members
121f: upper chamber
121g: Lower chamber
121h: Cylinder tube
121j, 121k: Stud bolt
122: Piston part
122a: Detection rod
122b: Piston rod
123, 124: Air supply / discharge pipe
125: Support member
130: Air circuit
131: First switching valve
132: Second switching valve
133: Master valve
134: Air source
135: Manual valve
136: Check valve
(1), (2), (4), (5), (6), (7), (8), (9): Air piping
140: Condensation pan
150: Cover part
151: Spring washer
152: Bolt
153: sliding hole
1: Plunger pump
2: Cylinder part
3: Plunger part
31: Plunger rod
32: Piston part in the pump
4: Upper lid
6: Lower lid
M: Conventional drive unit
J: Detection means
N: Air cylinder
N1: Cylinder chamber
N2: Piston part
n9: Detection rod
n10: Piston rod
N3, N4: Air supply / discharge pipe
N5: Support member
Q: Air circuit
Q4: Air source
Q3: Master valve
P: Plunger pump
A: Tube body
B: Plunger part
B1: Plunger rod
B2: Piston part in the pump
C: Upper lid

Claims (4)

The detecting means formed on one rod side of the double rod type double acting cylinder detects the reciprocation limit position of the piston portion in the double rod type double acting cylinder, and an air circuit receiving a signal from the detecting means In the plunger pump driving device for controlling the reciprocating motion of the piston portion and operating the plunger pump disposed on the other rod side,
A wall surface of a cylinder chamber in which a through hole through which the one rod is inserted is formed;
A cover part that is detachably attached to the wall surface from the outside;
A sliding hole formed in the cover portion, smaller in diameter than the through hole, and slidably fitted in one rod inserted through the through hole;
A plunger pump drive device characterized by comprising: 2. The plunger pump drive device according to claim 1 , wherein a tip of the one rod is a free end. The air circuit includes a first piping section that communicates one cylinder chamber and an air source among cylinder chambers separated by a piston section in the double rod double acting cylinder, and the other cylinder chamber and the air source. The first and second control pipes connected to the second piping section that communicates with the operating section of the first and second switching valves that operate by detecting the reciprocation limit position of the piston section by the detection means And the first and second control pipes are connected to a switching part on one side or the other side, and either one of the first pipe part or the second pipe part is caused by inflow of compressed air from the control pipe. A manual valve disposed in a third piping section that communicates the air source with a master valve that selects a compressed air flow path, and a switching section on one side or the other side of the master valve. And Breakfast,
The plunger pump driving device according to claim 1 , comprising: 3. The plunger pump drive device according to claim 1 , wherein a water condensate tray is disposed around a lower portion of the double rod type double acting cylinder.

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