JP2000265946A - Fluid feeding device with instantaneously reversing means - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the difficulty of switching of an oscillating pipe to be connected to a fluid feeding cylinder and noise to be generated in switching of a hydraulic cylinder of a high-pressure hydraulic circuit, in a fluid feeding device for feeding fluid by a piston method. SOLUTION: Reciprocating pistons Pa, Pb of fluid feeding cylinders CCa, CCb connected to fluid feeding hydraulic cylinders 3a, 3b are operated in the fluid sucking direction by receiving signals of the stroke ends of the fluid feeding hydraulic cylinders 3a, 3b or a swing switching hydraulic cylinder SC for the set time to be set according to the specification. High pressure sealed between the front surface sides of the fluid feeding reciprocating piston Pa or Pb is reduced. Therefore, the difficulty of switching of an osculating pipe to be selectively connected to the fluid feeding cylinders CCa, CCb and various noises are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a ready-mixed concrete,
In a fluid pumping device that pumps fluid such as slurry fluid such as earth and sand, soft soil, etc. by a piston type, a fluid pumping cylinder operated by a fluid pumping hydraulic cylinder generated when a hydraulic cylinder of a high pressure hydraulic circuit is switched. The present invention relates to an improvement in a fluid pumping device that reduces the difficulty of switching a swing pipe to be connected and various noises.

[0002]

2. Description of the Related Art A conventional fluid pumping device, for example, a concrete pump, is used for pumping concrete in a narrow place such as a tunnel, caisson, bridge, or inside a building for driving concrete. Thus, the plunger is reciprocated by mechanical force or hydraulic pressure to pump concrete into the iron pipe.

[0003] Among them, in the hydraulic concrete pump, when the hydraulic circuit is switched, when the pressure in the circuit rises due to the response delay of the switching valve, the cylinder starts operating, and a large fluid noise is generated. The subsequent impact is likely to generate noise as mechanical sound. This will be described with reference to a conventional double-cylinder hydraulic concrete pump shown in FIGS. 3 and 4. High-pressure hydraulic oil obtained by an oil pump 1 enters a hydraulic switching valve block 2,
The hydraulic cylinders are distributed to hydraulic cylinders 3a and 3b for pumping concrete for pumping ready-mixed concrete (hereinafter referred to as ready-mixed concrete) and hydraulic cylinders SC for swing switching for switching the swing pipe 31.

The hydraulic switching valve block 2 comprises a main relief valve 5, a switching valve 6 for a hydraulic cylinder 3 for concrete pumping, and a switching valve 7 for a hydraulic cylinder SC for swing switching. The hydraulic pressure of the switching hydraulic cylinders 3a and 3b is controlled, and the switching pilot pressure of the switching valve 6 is changed by the swing switching hydraulic cylinder SC.
Is controlled by a pilot pressure switching valve 8 based on electric signals from position detection switches 11a and 11b of the piston PS, and the other switching valve 7 is a swing switching hydraulic cylinder S
C controls the flow of the hydraulic oil, and the switching pilot pressure of the switching valve 7 changes the electric signals from the position detection switches 10a, 10b at the stroke ends of the pistons 4a, 4b installed in the hydraulic cylinders 3a, 3b for concrete pumping. And is controlled by the pilot pressure switching valve 9.

More specifically, the hydraulic cylinders 3a, 3b for concrete pumping are driven by the switching valve 6, the switching valve 7 is controlled by switching the hydraulic cylinders 3a, 3b for concrete pumping, and the hydraulic cylinder for swing switching is switched by switching the switching valve 7. SC is driven to operate in a cycle in which the switching valve 6 is controlled by switching the swing switching hydraulic cylinder SC.

Further, a hydraulic cylinder 3a for concrete feeding is provided.
Is operated in the direction of the arrow shown in FIG. 3, the solenoid valve 1 of the pilot pressure switching valve 8 is operated.
2 is ON, the solenoid valve 15 of the other pilot pressure switching valve 9 is ON, and when the piston 4a of the concrete pressure feeding hydraulic cylinder 3a reaches the stroke end, an electric signal is output from the position detection switch 10a. And the solenoid valve 1 of the pilot pressure switching valve 9
4, the hydraulic oil flows through the switching valve 7, and the piston PS of the hydraulic cylinder SC for swing switching operates from below to above in the direction opposite to the arrow shown in FIG.

When the piston PS of the swing switching hydraulic cylinder SC moves to the stroke end, an electric signal is output from the position detection switch 11b and the pilot pressure switching valve 8
The other solenoid valve 13 is energized, the switching valve 6 is switched to the opposite, and the hydraulic cylinder 3
The pistons 4a, 4b of the actuators a, 3b are operated in directions opposite to the arrows shown in FIG.

[0008]

In the conventional hydraulic concrete pump as described above, the switching valve 6 and the switching valve 7 shown in FIGS. 3 and 4 are switched, and the hydraulic cylinders 3a and 3b for concrete pressure feeding and the swing switching are performed. Hydraulic cylinder SC
When the pressure in the circuit rises due to the response delay of the switching valve at the moment when the pressure is switched, that is, at the moment when the high-pressure oil flows, the cylinder starts to move, so that a loud fluid noise is generated, and the impact after switching becomes a mechanical noise. It was a source of noise.

In the above-mentioned conventional hydraulic concrete pump, the switching valve 6 and the switching valve 7 are switched to switch the hydraulic cylinders 3a and 3b for concrete pumping and the hydraulic cylinder SC for swing switching, that is, the hydraulic cylinder 3a for concrete pumping. , 3b, the raw concrete sucked by the piston 4a of the hydraulic cylinder 3a for concrete pumping into the reciprocating piston Pa for concrete pumping is swung in the discharge direction, in the direction of the arrow shown in FIG. 31 to the connection end side.

On the other hand, for example, when the ready-mixed concrete is relatively hard or when the pumping distance is about 200M, the head pressure of the ready-made concrete becomes considerably high, and this high pressure is opposed from the swing pipe 31 side. The concrete pumping hydraulic cylinder 3a is pressed against the concrete pumping piston Pa side of the concrete pumping hydraulic cylinder 3a, and the ready-mixed concrete is sealed at a considerably high pressure in the connection portion between the concrete pumping piston Pa and the oscillating pipe 31. I have.

Therefore, the swing switching hydraulic cylinder S in a state where such a ready-mixed concrete is sealed at a considerably high pressure is used.
C is difficult to switch, and hence the swing pipe 31 is difficult to switch, and since the cylinder starts to move as described above, a loud fluid noise is generated. Was causing it. The present invention has been devised in view of these problems, and receives a signal of a stroke end of a hydraulic cylinder for fluid pumping or swing switching, and receives the signal of the fluid coupled with the hydraulic cylinder for fluid pumping. The reciprocating piston of the body pressure feeding cylinder is actuated in the suction direction of the fluid, and the high pressure sealed between the front side of the fluid pressure feeding reciprocating piston and the end of the oscillating pipe is applied to the fluid. The reciprocating piston for pressure feeding is operated in the suction direction for a set time set according to the design specification, and the pressure on the front side of the reciprocating piston for fluid pressure feeding is reduced, thereby operating the hydraulic cylinder for swing switching. It is an object of the present invention to provide a fluid pressure device with instantaneous reversal means configured to easily switch a swing pipe.

[0012]

According to a first aspect of the present invention, there is provided a fluid pressure device with instantaneous reversing means for supplying hydraulic pressure to a fluid pressure feeding hydraulic cylinder for operating a fluid pressure feeding reciprocating piston. , A switching valve for switching a circuit for supplying hydraulic pressure to a swing switching hydraulic cylinder, and a switching valve for the swing switching hydraulic cylinder by detecting a stroke end signal of the fluid pressure feeding hydraulic cylinder. And a switching means for detecting a stroke end signal of the swing switching hydraulic cylinder to switch a switching valve of the hydraulic pump hydraulic cylinder. Detecting means for detecting an instant when a signal is output; and detecting means for detecting a moment when the signal is detected, for a set time set in accordance with a design specification from the detection time detected by the detecting means. Instantaneous reversing means for operating the fluid reciprocating piston located at the stroke end of the hydraulic cylinder for moving body pumping in the suction direction and switching so as to reduce the pressure on the front side of the reciprocating piston for fluid pumping. It is characterized by that.

According to a second aspect of the present invention, there is provided a fluid pressure device with an instantaneous reversing means, comprising: a switching valve for switching a circuit for supplying a hydraulic pressure to a fluid pressure hydraulic cylinder for operating a fluid pressure reciprocating piston; A switching valve for switching a circuit for supplying hydraulic pressure to the switching hydraulic cylinder, a switching means for detecting a stroke end signal of the hydraulic cylinder for fluid-pressure feeding and switching the switching valve of the hydraulic cylinder for swing switching, and the swing switching And a switching means for switching a switching valve of the hydraulic cylinder for fluid pumping by detecting a stroke end signal of the hydraulic cylinder for hydraulic pumping, and detecting a moment when a switching signal of each of the switching valves is output. Means and the hydraulic cylinder for fluid pressure feeding for a set time set according to a design specification from the detection point detected by the detection means. Instantaneous reversing means for operating the fluid pressure reciprocating piston located at the troke end in the suction direction to switch the pressure on the front side of the fluid pressure reciprocating piston to reduce the pressure. A circuit for supplying a hydraulic pressure to the swing switching hydraulic cylinder after the pressure on the front side of the fluid-pressure reciprocating piston is reduced by an operation can be switched.

According to a third aspect of the present invention, there is provided a fluid pressure device with instantaneous reversing means, wherein the gate housing to which the fluid is supplied and the fluid in the gate housing are alternately sucked and discharged. A pair of fluid pumping cylinders provided outside the gate housing so as to communicate with the inside of the gate housing, and the fluid pumping cylinders provided so as to be respectively connected to the pair of fluid pumping cylinders A pair of fluid pressure-feeding hydraulic cylinders for operating the reciprocating pistons, an oscillating pipe having one end located at least inside the gate housing and supported so as to be rotatable around the axis at the other end, The other end of the oscillating pipe so as to selectively connect one end of the oscillating pipe to one of the pair of fluid pumping cylinders. A swing switching hydraulic cylinder that rotates around the axis, a switching valve that switches a circuit that supplies hydraulic pressure to the fluid pressure hydraulic cylinder that activates the fluid pressure reciprocating piston, and a swing switching hydraulic cylinder. A switching valve that switches a circuit that supplies hydraulic pressure to a swing switching hydraulic cylinder that operates a piston;
A switching means for detecting a stroke end signal of the hydraulic cylinder for fluid pumping and switching a switching valve of the hydraulic cylinder for swing switching; and a fluid pump for detecting the stroke end of the hydraulic cylinder for swing switching by detecting a stroke end signal of the hydraulic cylinder for swing switching. Switching means for switching the switching valve of the hydraulic cylinder for use, detecting means for detecting the moment when the switching signal of each of the switching valves is generated, and a set time set according to the design specification from the detection time detected by the detecting means. An instantaneous reversing means for operating the reciprocating piston for fluid pumping located at the stroke end of the hydraulic cylinder for fluid pumping in the suction direction and switching to reduce the pressure on the front side of the reciprocating piston for fluid pumping; After the pressure on the front side of the reciprocating piston for fluid pumping is reduced by the operation of the instantaneous reversing means, the swing switching is performed. It is characterized in that it is configured to be switched circuit for supplying hydraulic pressure to the pressure cylinder.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic explanatory view showing a hydraulic circuit when the fluid pumping device with instantaneous reversing means of the present invention is applied to a hydraulic concrete pump, and FIG. 2 is a schematic explanatory view showing an electric circuit according to the embodiment of FIG. is there.

As shown in FIG. 1, there is provided a gate housing GH into which a fluid is supplied. The gate housing GH communicates with the inside of the gate housing GH which alternately sucks and discharges the fluid in the gate housing GH. , A pair of fluid-pressure pumping cylinders CCa and CCb provided outside the gate housing GH. Further, the fluid pumping cylinders CCa and CCb are provided so as to be connected to the pair of fluid pumping cylinders CCa and CCb, respectively.
A pair of hydraulic cylinders 3a and 3b for supplying fluid pressure are provided for operating the reciprocating pistons Pa and Pb of b.

An oscillating pipe 31 is provided, one end of which is located at least inside the gate housing GH and supported so as to be rotatable around the axis of the other end.
1 is a pair of fluid-feeding cylinders C which make the above-mentioned pair of ends.
A swing-switching hydraulic cylinder SC that rotates around the axis at the other end of the swing pipe 31 so as to be selectively connected to either Ca or CCb.

Further, reciprocating pistons Pa, P for fluid pressure feeding
hydraulic cylinders 3a, 3b for pumping fluid to operate b
And a switching valve 7 for switching the circuit for supplying hydraulic pressure to the swing switching hydraulic cylinder SC for operating the piston PS of the swing switching hydraulic cylinder SC. Further, position detection switches 10a and 10b for detecting the positions of the stroke ends of the fluid pressure feeding hydraulic cylinders 3a and 3b are provided, and an electric signal detected by the position detection switches 10a and 10b is supplied to the pilot pressure switching switching valve 9. Switching means T1 for switching the switching valve 7 of the swing switching hydraulic cylinder SC at least
Is provided.

A position detecting switch 11 for detecting the position of the stroke end of the swing switching hydraulic cylinder SC.
a, 11b are provided, and the position detection switches 11a, 11b are provided.
A switching means T2 for switching the switching valve 6 of the hydraulic cylinders 3a and 3b for supplying fluid by supplying an electric signal to the switching valve 8 for switching the pilot pressure by detecting the electric signal detected by b. or,
A detection means including the above-described position detection switch for detecting the moment when the switching signal of each of the switching valves 6 and 7 is output;
The fluid pressure feeding hydraulic cylinder 3 is set for a set time set according to the design specification from the time of detection by the detection means.
The fluid pressure reciprocating piston Pa or Pb located at the stroke end of a or 3b is operated in the suction direction to switch the pressure on the front side of the fluid pressure reciprocating piston Pa or Pb so as to reduce the pressure, for example, described later. Instantaneous reversing means G constituted by the one-shot multivibrators 21, 23 and the like are provided.

The circuit for supplying the hydraulic pressure to the swing switching hydraulic cylinder SC is switched after the pressure on the front side of the reciprocating piston Pa or Pb for feeding the fluid is reduced by the operation of the instantaneous reversing means G. ing. Next, the operation of the configuration of the above embodiment will be described. In the hydraulic concrete pump shown in FIG. 1, when the pistons 4a and 4b of the hydraulic cylinders 3a and 3b for pumping concrete are operating in the directions of the arrows, one of the pilot pressure switching valves 8 is used.
The solenoid valve 12 of the other pilot pressure switching valve 9 is ON and the solenoid valve 15 of the other pilot pressure switching valve 9 is ON, and the hydraulic cylinder 3a for concrete pressure feeding is supplied by the hydraulic oil supplied from the oil pump 1 to the hydraulic switching valve block 2.
When the piston 4a reaches the stroke end, the solenoid valve 14 of the other pilot pressure switching valve 9 is energized by the electric signal of the position detection switch 10a, and the switching valve 7 of the swing switching hydraulic cylinder SC starts to be switched. As shown in the electric circuit of FIG. 2, the solenoid valve 13 of the pilot pressure switching valve 8 is energized by the one-shot multivibrator 23 for a time (Δt time) set according to the design specification. The switching valve 6 is instantaneously switched downward from within the time Δt.

During this Δt time, the switching valve 6 is instantaneously switched, and during the Δt time, the concrete pumping cylinder CCa connected via the piston 4a and the rod La of the concrete pumping hydraulic cylinder 3a is used for concrete pumping. The piston 4a and the concrete-feeding reciprocating piston Pa are instantaneously operated in the suction direction of the reciprocating piston Pa in a direction opposite to the arrow shown in FIG. Is depressurized.

Then, after the pressure on the front side of the concrete reciprocating piston Pa for pressure feeding is reduced as described above, the switching valve 7 completes the switching during the time Δt, and the hydraulic cylinder SC for swing switching is shown in FIG. 1 is operated in a direction opposite to the direction of the arrow shown in FIG.
The swing pipe 31 can be easily switched to the left position 31L indicated by the two-dot chain line (hereinafter, the swing pipe switched to the left position is the swing pipe 31L, and the swing pipe switched to the right position is Swinging pipe 31R). The hydraulic cylinder SC for swing switching of the swing pipe 31 operates upward from below in FIG. 1, and the electric signal detected by the position detection switch 11 b at the stroke end is supplied to the solenoid valve 13 of one of the pilot pressure switching valves 8. When the switching valve 6 of the hydraulic cylinders 3a, 3b for supplying concrete is turned on,
In FIG. 1, the raw concrete in which the concrete reciprocating piston Pb which is switched from the lower side to the upper side and which is connected to the piston 4b of the hydraulic cylinder 3b for concrete pumping via the rod Lb is sucked into the cylinder CCb for concrete pumping is shown in FIG. The swinging pipe 3 at the left position indicated by the two-dot chain line
It is discharged to 1L and further supplied to the discharge pipe 33.

Then, as described above, the pistons 4a, 4b and the concrete reciprocating pistons Pa, Pb of the hydraulic cylinders 3a, 3b operate in the directions opposite to the arrows shown in FIG. Cylinder 3b
When the piston 4b reaches the stroke end, the electric signal detected by the position detection switch 10b is energized to the solenoid 15 of the other pilot pressure switching valve 9, and the switching valve 7 of the swing switching hydraulic cylinder SC starts to be switched. The electric signal detected by the position detection switch 11b is supplied to the solenoid 12 of the pilot pressure switching valve 8 by the one-shot multivibrator 21 for the Δt time,
In FIG. 1, the switching valve 6 is instantaneously switched from below to above within the time Δt.

During this Δt time, the concrete pumping reciprocating piston Pb connected via the piston 4b of the hydraulic cylinder 3b and the rod Lb is instantaneously operated in the suction direction, that is, in the direction of the arrow shown in FIG. The pressure on the front side of the reciprocating piston Pb is reduced. During this Δt time, the switching valve 7 is switched, and the hydraulic cylinder SC for swing switching is operated in the direction of the arrow shown in FIG. 1 to move the swing pipe 31 to the right position 3 of the solid line shown in FIG.
1R can be switched during the low pressure.

The swing switching hydraulic cylinder SC
At the end of the stroke, the electric signal detected by the position detection switch 11a is energized to the solenoid 12 of the pilot pressure switching valve 8, and the switching valve 6 is switched, so that the piston 4b of the hydraulic cylinder 3b for concrete pumping moves in the direction of the arrow and the concrete pumping. Piston 4 of hydraulic cylinder 3a
a and the reciprocating piston Pa are actuated in the direction of the arrow, and the ready-mixed concrete sucked by the concrete pumping cylinder CCa is discharged by the concrete pumping reciprocating piston Pa to the oscillating pipe 31R shown by the solid line in FIG. Then, it is further supplied to the discharge pipe 33.

The above two strokes are repeated, and the solenoid valves 12, 13, 14, 1, 1 of the pilot pressure switching valves 8, 9 are repeated.
5 and at the same time when the stroke ends of the hydraulic cylinders 3a and 3b for concrete feeding are reached, the one-shot multivibrators 21 and 23 are set according to the design specifications by the electric signals detected by the position detection switches 10a and 10b. During the time Δt, the solenoid 13 (or 12) of the pilot pressure switching valve 8 is energized and the switching valve 6 is turned on.
Is instantaneously operated in the direction (arrow direction) opposite to the arrow direction shown in FIG. 1 to reduce the pressure on the front surface of the reciprocating piston Pa (or Pb) for concrete pumping, thereby facilitating the swing pipe 31. You can switch.

Then, by lowering the pressure on the front side of the reciprocating piston Pa or Pb for concrete pumping, the swing pipe 3
1 can be easily switched at a low pressure, and the occurrence of the noise and the like can be prevented. In the above embodiment, the position detecting switches 10a and 10b detect the stroke ends of the concrete hydraulic cylinders 3a and 3b. However, the position detection switches 10a and 10b detect the stroke ends of the concrete hydraulic cylinders CCa and CCb. Even in this case, the same operation and effect as described above can be obtained.

(1). In the above example, the switching valve switches between the two types of hydraulic cylinders. However, the switching valve is not limited to the number and type of actuators, and the switching valve is not limited to the number and type. (2). Reciprocating piston Pa or P for concrete pumping
The circuit for lowering the pressure on the front side of b
Although a one-shot multivibrator is used as a means for extracting a switching signal, other means can be employed.

(3). The position detection switch is not limited to the above embodiment, but may be any switch capable of detecting the stroke end position of the cylinder, such as a proximity sensor or a reed switch. (4). The location where the above signal is taken out is not limited to the energized location of the solenoid, and the piston position detection signal,
It may be from anywhere between the detection signal and the solenoid.

[0030]

As described above in detail, according to the fluid pumping device with instantaneous reversing means according to any one of claims 1 to 3, the signal of the stroke end of the hydraulic cylinder for fluid pumping is provided. And a switching means for detecting a stroke end signal of the swing switching hydraulic cylinder and switching the switching valve of the fluid pressure transmitting hydraulic cylinder by detecting a stroke end signal of the swing switching hydraulic cylinder. In the fluid pumping device, a detecting means for detecting an instant when a switching signal of each of the switching valves is generated, and the fluid pumping for a set time set according to a design specification from a detection time of the signal detected by the detecting means. Instantaneous reversing means for switching the reciprocating piston of the fluid pressure feeding cylinder located at the stroke end of the hydraulic cylinder for switching to the suction direction. The circuit for supplying the hydraulic pressure to the swing switching hydraulic cylinder can be switched within the set time by the operation of the transfer means. The reciprocating piston of the fluid pumping cylinder is operated in the suction direction for the set time, the pressure on the front side of the reciprocating piston of the fluid pumping cylinder is reduced, and the swing pipe is smoothly moved by the swing switching hydraulic cylinder. Can be switched to

Also, the instantaneous hydraulic circuit pressure at the start of cylinder operation is reduced to reduce the energy stored at the time of switching the hydraulic circuit, and the energy at the start of cylinder drive can be reduced. And the mechanical noise can be reduced.
In addition, by lowering the pressure on the front side of the fluid pressure-feeding piston by the set time during which the instantaneous reversing means operates, during the cylinder operation (mid-stroke) other than the operation of the instantaneous reversing means, As a result, it is possible to operate in a high-pressure circuit, reduce the performance degradation of the fluid pumping device, suppress the peak pressure generated at the time of switching, and improve the life of consumables such as cylinders, packings and seals.

In general, in a hydraulic concrete pump, when the hydraulic cylinder is switched, the cylinder starts to operate after the pressure in the circuit increases due to a response delay of the switching valve, so that a large fluid noise is generated and the impact after the switching is reduced. Although noise is easily generated as mechanical noise, the present invention receives the switching signal of the switching valve that operates the instantaneous reversing means and reduces the pressure on the front side of the fluid pressure-feeding piston for the set time from that time. Therefore, the stored energy generated when the hydraulic circuit is switched can be reduced, and during the cylinder operation other than the switching (during the stroke), the cylinder can be operated with the high-pressure circuit to reduce the performance degradation of the device. it can.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing a hydraulic circuit when a fluid pumping device with instantaneous reversing means of the present invention is applied to a hydraulic concrete pump.

FIG. 2 is a schematic explanatory view showing an electric circuit according to the embodiment of FIG. 1;

FIG. 3 is a schematic explanatory diagram showing a hydraulic circuit of a conventional hydraulic concrete pump.

FIG. 4 is a schematic explanatory view showing the electric circuit of FIG. 3;

[Explanation of symbols]

Reference Signs List 1 oil pump 2 hydraulic switching valve block 3a, 3b hydraulic cylinder for concrete pumping 4a, 4b piston of hydraulic cylinder for concrete pumping 5 main relief valve 10a, 10b position detecting switch 11a, 11b position detecting switch 21, 23 one-shot multivibrator 31 Swinging pipes CCa, CCb Cylinder for concrete pumping La, Lb Rod Pa, Pb Reciprocating piston for concrete pumping PS Piston for hydraulic cylinder for swing switching SC Hydraulic cylinder for swing switching #

Claims (3)

[Claims] A switching valve for switching a circuit for supplying hydraulic pressure to a hydraulic cylinder for fluid pumping for operating a reciprocating piston for fluid pumping, a switching valve for switching a circuit for supplying hydraulic pressure to a hydraulic cylinder for swing switching, A switching means for detecting a stroke end signal of the hydraulic cylinder for fluid pumping and switching a switching valve of the hydraulic cylinder for swing switching; and a fluid pump for detecting the stroke end of the hydraulic cylinder for swing switching by detecting a stroke end signal of the hydraulic cylinder for swing switching. Fluid switching device for switching a switching valve of a hydraulic cylinder for use in a fluid pumping device, a detecting device for detecting a moment when a switching signal of each of the switching valves is generated, and a design specification based on a detection time detected by the detecting device. Reciprocating piston for fluid pumping located at the stroke end of the hydraulic cylinder for fluid pumping for a set time Instantaneous reversing means for operating the fluid in the suction direction to switch the pressure on the front side of the reciprocating piston for fluid pumping so as to reduce the pressure.
Fluid pumping equipment. 2. A switching valve for switching a circuit for supplying hydraulic pressure to a hydraulic cylinder for fluid pumping for operating a reciprocating piston for fluid pumping, a switching valve for switching a circuit for supplying hydraulic pressure to a hydraulic cylinder for swing switching, A switching means for detecting a stroke end signal of the hydraulic cylinder for fluid pumping and switching a switching valve of the hydraulic cylinder for swing switching; and a fluid pump for detecting the stroke end of the hydraulic cylinder for swing switching by detecting a stroke end signal of the hydraulic cylinder for swing switching. Fluid switching device for switching a switching valve of a hydraulic cylinder for use in a fluid pumping device, a detecting device for detecting a moment when a switching signal of each of the switching valves is generated, and a design specification based on a detection time detected by the detecting device. Reciprocating piston for fluid pumping located at the stroke end of the hydraulic cylinder for fluid pumping for a set time Instantaneous reversing means for operating the fluid reciprocating piston to reduce the pressure on the front side of the reciprocating piston for fluid pumping by reducing the pressure on the front side of the reciprocating piston for fluid pumping. A fluid supply device provided with instantaneous reversing means, wherein a circuit for supplying hydraulic pressure to the swing switching hydraulic cylinder can be switched after the pressure on the side is reduced. 3. A gate housing, into which a fluid is supplied, and an outside of the gate housing communicating with the inside of the gate housing, which alternately sucks and discharges the fluid in the gate housing. A pair of fluid pumping cylinders and a pair of fluid pumping hydraulic cylinders provided to be respectively connected to the pair of fluid pumping cylinders and actuating the reciprocating pistons of the fluid pumping cylinders An oscillating pipe having one end positioned at least inside the gate housing and supported so as to be rotatable about an axis at the other end; and a fluid forming the pair at one end of the oscillating pipe. A swing switching hydraulic cylinder that rotates around the axis at the other end of the swing pipe so as to be selectively connected to one of the pressure feeding cylinders; A switching valve for switching a circuit for supplying hydraulic pressure to the hydraulic cylinder for fluid pumping for operating the reciprocating piston for fluid pumping, and a hydraulic pressure for a hydraulic cylinder for swing switching for operating a piston of the hydraulic cylinder for swing switching. A switching valve for switching a circuit to be switched, a switching means for detecting a stroke end signal of the hydraulic cylinder for fluid pumping and switching a switching valve of the hydraulic cylinder for swing switching, and a signal for a stroke end of the hydraulic cylinder for swing switching. Switching means for detecting the switching valve of the hydraulic cylinder for feeding the fluid pressure, detecting means for detecting the moment when the switching signal of each of the switching valves is output, and setting the design specification from the detection time detected by the detecting means. The fluid positioned at the stroke end of the fluid pressure feeding hydraulic cylinder for a set time set accordingly Instantaneous reversing means for operating the reciprocating piston for feeding in the suction direction and switching so as to reduce the pressure on the front side of the reciprocating piston for fluid pressure feeding, wherein the instantaneous reversing means operates to reciprocate the fluid pumping fluid. A fluid pumping device with instantaneous reversing means, characterized in that a circuit for supplying hydraulic pressure to the swing switching hydraulic cylinder can be switched after the pressure on the front side of the dynamic piston is reduced.