JPH0527289U - Intake and discharge valve device for viscous fluid pump - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the back flow of viscous fluid during pressure feeding by viscous fluid pump. A rocking tube 21 is used as a switching valve of a viscous fluid pump that sucks in and discharges a viscous fluid 4 in a hopper 1 by alternately reciprocating two fluid cylinders 5 and 6. Rocking tube 2
The viscous fluid 4 is pressure-fed through the inside of the rocking pipe 21 by rocking 1 to make it communicate with the fluid cylinders 5 or 6 alternately. A sluice valve 29 that can open and close the conduit is provided on the outlet side of the oscillating pipe 21. The sluice valve 29 is closed during the switching of the oscillating pipe 21, and when the switching of the oscillating pipe 21 is confirmed, the sluice valve 29 is
To open.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a suction and discharge valve device of a viscous fluid pump that pumps a viscous fluid such as concrete.

[0002]

[Prior Art]

 Intake and discharge valves of viscous fluid pumps that send viscous fluid such as concrete under pressure include swing valve type and slide valve type.

The former oscillating valve type intake / discharge valve is, as shown in FIGS. 2 to 4, one example, a hopper 1 for a viscous fluid 4 provided with two intake / discharge ports 2 and 3 arranged side by side in the lower front portion. On the outer side, two fluid cylinders 5 and 6 are installed horizontally and in parallel so as to correspond to the two suction and discharge ports 2 and 3, and a fluid piston 7 housed in the fluid cylinders 5 and 6, 8 is integrally connected to the hydraulic pistons 12 and 13 in the two main hydraulic cylinders 10 and 11 which are integrated with the fluid cylinders 5 and 6 via the cleaning chamber 9 via the rods 14 and 15. In addition, the rod-side pressure chambers of the two main hydraulic cylinders 10 and 11 are communicated with each other by the closed circuit 16, and the head-side pressure chambers are connected to the pressure-oil supply and discharge pipes 17 and 18, respectively. The discharge of the hydraulic pump 20 to the discharge pipes 17 and 18 via the electromagnetic switching valve 19. The outlet side is connected, and the pistons 12 and 13 of the two main hydraulic cylinders 10 and 11 are alternately moved forward and backward so that the fluid pistons 7 and 8 of the two hydraulic cylinders 5 and 6 are alternately reciprocated. I am doing it. On the other hand, an oscillating tube 21 bent in an S shape is housed in the hopper 1, and a seal ring 22 is attached to one end of the oscillating tube 21 so that the seal ring 22 can be used for the above two suction and discharge. The seal plate 23 attached inside the outlets 2 and 3 is contacted so that the seal plate 23 can be swung in the left-right direction, and the other end of the swing tube 21 is pushed through the rear side of the hopper 1. The connecting shaft 25 fixed to the pipe 24 and fixed in the middle of the rocking pipe 21 is taken out to the front side of the hopper 1, and the connecting shaft 25 is connected to the rocking cylinder via the operating lever 26. 27 and 28 are connected to each other, and the oscillating cylinders 27 and 28 oscillate the oscillating tube 21 to the left and right so that the two intake and discharge ports 2 and 3 are alternately aligned.

When the viscous fluid 4 in the hopper 1 is sucked and discharged by the viscous fluid pump, one end of the swing pipe 21 is alternately moved to the two suction / discharge ports 2 and 3 by the swing cylinders 27 and 28. At the intake / discharge port 2 side where one end of the swing pipe 21 is positioned, the main hydraulic cylinder 10 is extended and the piston 7 in the fluid cylinder 5 is moved forward. The viscous fluid sucked therein is discharged through the swing pipe 21 to the discharge pipe 24, and at the same time, the viscous fluid 4 in the hopper 1 is sucked through the suction discharge port 3 in the other fluid cylinder 6, When the oscillating pipe 21 is switched, the forward and backward movements of the fluid cylinder 5 or 6 are switched so that the fluid cylinder 5 or 6 is discharged, and the two fluid cylinders 5 and 6 alternately suck and discharge the viscous fluid. A viscous fluid is transported to a high place or a distant place by a transport pipe (not shown).

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned rocking valve type viscous fluid pump, the rocking pipe 21 is switched by the rocking cylinders 27 and 28 so that one end of the rocking pipe 21 is changed from one suction / discharge port 2 or 3 to the other suction / discharge port 3. Or there is a position where the suction and discharge sides of the two fluid cylinders 5 and 6 communicate with one end of the oscillating pipe 21 during the transfer to 2 (during switching), and the viscous fluid is pumped to a high place. During this time, the viscous fluid being pumped at the above position may flow backward. Conventionally, there is an example in which a valve for shutting off the viscous fluid pressure-feeding pipe is provided, but this valve is closed when cleaning the pipes, etc. to prevent backflow during pressure-feeding of the viscous fluid. Is not something that does.

Therefore, in the present invention, in the swing valve type suction / discharge valve, the viscous fluid being pumped flows backward until the swing tube is completely switched from one of the two suction / discharge ports to the other. It is an attempt to avoid fear.

[0007]

[Means for Solving the Problems] In order to solve the above problems, the present invention is configured to alternately discharge viscous fluid in a hopper, which is alternately introduced into two fluid cylinders, through a rocking tube. In a suction / discharge valve device for a viscous fluid pump, a plate-like sluice valve for closing the pipeline is provided in the middle of the pipeline for pumping the viscous fluid discharged through the oscillating pipe. The hydraulic cylinder for opening and closing the sluice valve is configured to interlock with the switching of the two fluid cylinders and the switching of the oscillating pipe.

[0008]

[Action]

 When one of the fluid cylinders is advanced to discharge the viscous fluid taken into the fluid cylinder and pressure-feed it through the oscillating pipe, the sluice valve is closed to shut off the pipeline. When it is confirmed that the sluice valve is closed, the oscillating tube is oscillated to switch to another suction / discharge port position. When the switching of the rocking pipe is confirmed, switching of the two fluid cylinders and opening operation of the sluice valve are performed. Since the sluice valve is closed during the switching of the oscillating pipe, there is no backflow of viscous fluid.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

1A and 1B and FIG. 2 show an embodiment of the present invention. Similar to the case of the conventional viscous fluid pump shown in FIGS. 2 to 4, Two intake / exhaust outlets 2 at the lower front of the hopper 1. Corresponding to 3, two fluid cylinders 5, Place 6 in parallel, Both fluid cylinders 5, Fluid piston 7 in 6, 8 two main hydraulic cylinders 10, Hydraulic piston 12 in 11, 13, Each rod 14, Connected integrally via 15. The two main hydraulic cylinders 10, Alternating 11 forwards, By retreating, the two fluid cylinders 5, Fluid piston 7 in 6, 8 are made to reciprocate alternately, Moreover, the rocking tube 21 housed in the above hopper 1 is A seal ring 22 is attached to one end, and the other end is supported by penetrating the rear wall of the hopper 1 so that the one end can swing to the left and right. Rocking cylinder 27 outside the hopper 1, 28 rocks the rocking tube 21 to the left and right, When one end side of the rocking tube 21 is aligned with the fluid cylinder 5 or 6 that has sucked the viscous fluid 4 in the hopper 1, The viscous fluid 4 in the fluid cylinder 5 or 6 is discharged through the rocking pipe 21. Discharge pipe 24, In a configuration that is designed to send pressure to a high place or a remote place via a transport pipe (not shown), Near the discharge port of the rocking tube 21, A gate valve type sluice valve 29 is provided so that it can be opened and closed freely (ascend and descend). A piston rod 31 of an opening / closing hydraulic cylinder 30 is connected to the gate valve 29, By expanding and contracting the hydraulic cylinder 30, the sluice valve 29 is moved up and down to open and close, In addition, opening and closing the sluice valve 29, Switching of the rocking tube 21, Fluid piston 7, It should be linked with the reciprocating movement of 8.

More specifically, as shown in FIG. 1B, the rod side pressure chambers of the two main hydraulic cylinders 10 and 11 integrated with the two fluid cylinders 5 and 6 are connected by the sealing circuit 16, The pressure oil supply / discharge pipes 17 and 18 are connected to the respective pressure chambers on the rod side via the electromagnetic switching valve 32 to the pressure oil supply line 34 from the hydraulic pump 33 and the pressure oil return line 36 returning to the tank 35. By switching the electromagnetic switching valve 32, the pressure oil discharged from the hydraulic pump 33 is alternately supplied to the main hydraulic cylinders 10 or 11, and the main hydraulic cylinders 10 and 12 are alternately moved forward and backward to move to the fluid cylinder 5. 6 is alternately switched to the suction side and the discharge side, and an electromagnetic switching valve 38 is provided in the middle of a line 37 for supplying pressure oil to the two rocking cylinders 27 and 28. Switching the electromagnetic switching valve 38 By the pressure oil discharged from the hydraulic pump 39 being supplied from the line 37, the rocking cylinders 27 and 28 are alternately moved forward and backward to rock the rocking pipe 21 left and right. An electromagnetic switching valve 41 is provided in the middle of a pressure oil line 40 for supplying pressure oil to the head side pressure chamber and the rod side pressure chamber of the hydraulic cylinder 30 for opening and closing the sluice valve 29, and the electromagnetic switching valve 41 is switched. As a result, pressure oil is supplied from the pressure oil line 40 to the rod side pressure chamber or the head side pressure chamber so that the sluice valve 29 is opened and closed by the hydraulic cylinder 30, and the pressure oil line 40 is connected to the hydraulic pump. The pressure oil line 37 from the pump 39 to the rocking cylinders 27 and 28 is branched from the middle. Further, sensors LS1 and LS2 for detecting the stroke ends of the hydraulic pistons 12 and 13 are provided at the stroke ends of the main hydraulic cylinders 10 and 11 after the forward movement, and the stroke ends of the swing cylinders 27 and 28 are provided at the stroke ends. , Sensors LS3 and LS4, and sensors LS5 and LS6 at the head side and rod side stroke ends of the hydraulic cylinder 30 for the sluice valve 29. When the oscillating cylinder 27 or 28 reaches the stroke end and the sensor LS3 or LS4 is actuated by switching the pipe 21, the solenoid SOL. 6 is excited, and at the same time the solenoid valve SOL. 1 or SOL. 2 is excited to switch the electromagnetic switching valve 32 to the port a or b, and when the main hydraulic cylinder 10 or 11 reaches the stroke end and the sensor LS1 or LS2 is activated, the electromagnetic switching valve is operated. 41 Solenoid SOL. 5 is excited so that the electromagnetic switching valve 41 is switched to the port a. By switching the electromagnetic switching valve 41, the hydraulic cylinder 30 for the sluice valve 29 extends and reaches the stroke end, and the LS6 sensor detects the sluice valve 29. When it is confirmed that the signal from the sensor LS6 and the signal from the sensor LS1 or LS2 are simultaneously detected, the solenoid SOL. 3 or SOL. 4 is excited so that the electromagnetic switching valve 38 can be switched to the port a or b. It should be noted that the solenoid SOL. 1 or SOL. The pressure oil from the accumulator Acc provided in the pressure oil line 37 to the oscillating cylinders 27 and 28 is constantly applied to the oscillating cylinders 27 and 28 via the line 42. For example, the solenoid SOL. 1 is excited and the solenoid directional control valve 32 is switched to port a, the solenoid SOL. The pressure oil from 2 is released to the tank 35 through the line 43. Other configurations are the same as the conventional ones, and the same components are denoted by the same reference numerals.

Now, the two main hydraulic cylinders 10 and 11 are alternately advanced and retracted to alternately reciprocate the fluid pistons 7 and 8 in the fluid cylinders 5 and 6, and the rocking pipe 21 is rocked to the left and right. When the viscous fluid that is moved and sucked into the fluid cylinder 5 or 6 is continuously discharged through the oscillating pipe 21, for example, the main hydraulic cylinder 7 moves forward and the viscosity taken into the fluid cylinder 5 is increased. When the fluid is discharged through the oscillating pipe 21 and the hydraulic piston 12 of the main hydraulic cylinder 10 reaches the stroke end, the sensor LS1 is actuated to operate the solenoid valve SOL. 5 is excited to supply pressure oil to the pressure chamber on the head side of the hydraulic cylinder 30, so that the sluice valve 29 is lowered and the pipeline is closed. When the closing of the sluice valve 29 is confirmed by the sensor LS6, the solenoid SOL. Of the electromagnetic switching valve 38 is detected by the sensors LS6 and LS1. 4 is excited to cause the rocking cylinder 28 to extend, and the rocking tube 21 is rocked to rock the rocking cylinder 21 to the position where it communicates with the fluid cylinder 6 through the suction / discharge port 3. The sluice valve 29 remains closed until the swing cylinder 28 is completely switched, and when the sensor LS3 confirms that the swing tube 21 has been switched, the sensor LS3 switches the electromagnetic switch. Valve 32 solenoid SOL. 1 is excited and the electromagnetic switching valve 32 is switched to the port a, and at the same time, the solenoid SOL. 6 is excited. As a result, pressure oil is supplied to the head side pressure chamber of the main hydraulic cylinder 11 and pressure oil is supplied to the rod side pressure chamber of the hydraulic cylinder 30 for the sluice valve 29, and the sluice valve 29 is opened. The hydraulic piston 13 of the main hydraulic pump 11 is advanced, and the viscous fluid taken into the fluid cylinder 6 is discharged through the oscillating pipe 21.

When the main hydraulic cylinder 11 extends and reaches the stroke end, it is detected by the sensor L S2 and the solenoid SOL. When 5 is excited, the sluice valve 29 closes. When the closing of the gate valve 29 is confirmed by the sensor LS6, the solenoid SOL. Of the electromagnetic switching valve 38 is detected by the sensors LS6 and LS2. 3 is excited, the swing cylinder 27 is extended, and the swing tube 29 is switched to the fluid cylinder 5 side. When the switching of the oscillating pipe 29 is completed, the sensor LS4 causes the solenoid SOL. 6 is excited to open the sluice valve 29, and at the same time, the sensor LS4 causes the solenoid SOL. 2 is excited and switched to port b.

According to the present invention, when the rocking tube 21 is rocked to the left and right to switch to the two suction and discharge ports 2 and 3, the sluice valve 29 is closed while the rocking tube 21 is rocking. In this way, the sluice valve is opened after the switching of the oscillating tube 21 is completed, so that it is possible to prevent the viscous fluid from flowing backward during the switching of the oscillating tube 21.

It should be noted that the present invention is not limited to the above embodiment, and for example, the sluice valve 29 is provided near the outlet of the oscillating pipe 21, but it may be provided in the middle of the transportation pipe. Although it is shown that the pump having the oscillating tube 21 in the hopper 1, the two oscillating cylinders are inserted into the hopper so as to be able to move forward and backward, and the oscillating tube is provided outside the hopper. It is needless to say that the present invention can be similarly applied to a penetration type pump in which the above-mentioned arrangement is provided, and that various changes can be made without departing from the scope of the present invention.

[0016]

[Effect of the device]

 As described above, according to the suction / discharge valve device of the viscous fluid pump of the present invention, the viscous fluid alternately taken into the two fluid cylinders is discharged through the oscillating pipe to be transported to the intended place. In the configuration described above, when the rocking pipe is switched so as to alternately communicate with the two fluid cylinders, a sluice valve that is closed during the switching and is opened when the switching is completed is provided in the rocking pipe. Since the structure is provided near the outlet, the viscous fluid transportation pipeline is closed during switching of the oscillating pipe, and it is possible to prevent backflow of the fluid even when the viscous fluid is transported to a high place. Further, since a sluice valve is provided and the pipe line is closed when switching the rocking pipe, the internal pressure is released when switching the rocking pipe, which makes it possible to smoothly switch the rocking pipe. Can be effective.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, in which (A) is a cut side view and (B) is a hydraulic control circuit diagram.

FIG. 2 is a cut side view showing an example of a conventional swing valve type intake / discharge valve.

FIG. 3 is a schematic view seen from the direction III in FIG.

FIG. 4 is a schematic plan view showing an example of a conventional viscous fluid pump.

[Explanation of symbols]

 1 Hopper 2,3 Suction / Discharge Port 4 Viscous Fluid 5,6 Fluid Cylinder 10,11 Main Hydraulic Cylinder 14 Rod 21 Swing Pipe 22 Seal Ring 27,28 Swing Cylinder 29 Gate Valve 30 Hydraulic Cylinder 32,38,41 Electromagnetic Switching valve

Claims (1)

[Scope of utility model registration request] 1. The one rocking tube is alternately fed to the two fluid cylinders so that the viscous fluid alternately taken into the two fluid cylinders is alternately discharged through the one rocking tube. In a suction / discharge valve device of a viscous fluid pump that is switched so as to communicate with each other, a sluice valve that closes the viscous fluid discharged through the oscillating pipe can be opened and closed in the middle of the duct. A hydraulic cylinder for opening and closing the sluice valve is interlocked with switching of suction and discharge of the two fluid cylinders and switching of the oscillating pipe to the two fluid cylinders. Intake and discharge valve device for viscous fluid pump.