JPS62218665A - Extra-high pressure water generator - Google Patents

Abstract

PURPOSE:To eliminate a change in pressure by alternately advancing piston rods in a pair of cylinders with difference in time to the pressure side of a plunger portion, and making the retreating speed higher than the advancing speed. CONSTITUTION:Fluid pressure cylinders 21, 22 are connected to conduits 25, 26, and selectively connected to a hydraulic pump 29 and an oil reservoir tank 30 through directional control valves 27, 28. A piston rod 32 is advanced immediately before the advance stroke of a piston rod 31. The retreating speed of a piston head 23 is slower than the advancing speed and controlled by limit switches 48-52. Accordingly, high-pressure discharge pressure is operated immediately before the end of the advance stroke of plunger portions 33, 34 of the piston rods 31, 32, overlapping therewith, so that hydraulic pressure is kept from being lowered.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Field of Application) The present invention relates to an ultra-high pressure water generator, and includes a 10100ON/
This invention relates to a device for obtaining a high-pressure water flow exceeding i.

(Prior Art) As a conventional ultra-high pressure generator of this type, a booster device as shown in FIG. 3 is known, for example.

This conventional device has a piston rod 3 that is moved forward and backward by a piston head 2 fitted into a hydraulic cylinder 1, and plunger portions 4.5 at both ends of the piston rod 3 are alternately moved forward and backward into a pressure increasing cylinder 6.7. , each pressure increasing cylinder 6.7 is connected between each check valve 10° 11 connected to the water supply circuit 8, 9, respectively, and the hydraulic cylinder 1
A hydraulic pump 13 as a low pressure source is connected to both ends of the cylinder via a switching valve 12, and the piston head 2 fitted into the hydraulic cylinder 1 is reciprocated by the hydraulic pressure supplied from the hydraulic pump 13 by switching the switching valve 12. The plunger portion 4.5 of the piston rod 3 alternately moves forward and backward in the pressure increase cylinder 6.7, sucking water from the water supply circuits 8 and 9 into the pressure increase cylinder 6.7 and from the pressure increase cylinder 6.7. Increase pressure and discharge,
A structure is adopted in which ultra-high pressure water is alternately supplied to a high pressure circuit 14 connected to water supply circuits 8 and 9.

(Problems to be Solved by the Invention) In the above-mentioned conventional device, the forward and backward directions of the piston head 2 are switched by the switching valve 12, and the pressure boosting cylinders 6 and 7 are alternately brought to ultra-high pressure, so that the combined secondary pressure However, as shown in the waveform shown in FIG. 4, the ultra-high pressure inevitably drops every time the switching valve 12 is switched. In order to avoid this pressure fluctuation, conventionally, an accumulator or the like has been used to reduce the pressure fluctuation. However, even if an accumulator is used, a waveform as shown by the chain line in FIG. 4 will result, and it is basically difficult to eliminate the pressure drop, which will inevitably have a large impact on the quality and productivity of the work performed by this device.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide an ultra-high pressure water generator that eliminates pressure fluctuations and provides stable water pressure.

(Structure of the Invention) (Means for Solving the Problems) The ultra-high pressure water generating device of the present invention is fitted into a pair of low-pressure side fluid pressure cylinders so that they can move forward and backward, respectively, and is moved forward and backward by switching operation of a switching valve. A pair of piston rods are provided, and a pair of pressure increasing cylinders into which the plunger portion at the tip of each piston rod is fitted so as to be freely retractable are connected between the check valves provided in the water supply circuit respectively, and the discharge side of the water supply circuit An injection nozzle is provided at the tip of the high-pressure water conduit connected to the cylinder, and a relief valve is connected to the pressure source side of the cylinder, and the pair of piston rods are alternately advanced to the pressurizing side of the plunger portion with a time difference. The feature is that the retraction speed of each piston rod is faster than the advance speed.

(Function) In the ultra-high pressure water generator of the present invention, a pair of piston rods fitted into a pair of cylinders so as to be able to move forward and backward are alternately advanced to the pressurizing side of the plunger portion with a time difference, and the advancing stroke of the piston rods is completed. Immediately before, both move forward, and the first piston rod that moved forward moves backward at a faster speed than the advancing speed during the advancing movement of the second piston rod, and furthermore, this first piston rod moves forward first. The advancing operation is performed just before the advancing stroke of the second piston rod ends, and a stable ultra-high pressure water flow is obtained.

(Embodiment) The configuration of an embodiment of the present invention will be described with reference to FIG. 1 of the drawings.

Reference numerals 21 and 22 denote a pair of identically formed low-pressure side fluid pressure cylinders, into which a pair of identically formed piston heads 23 and 24 are slidably fitted, respectively. Conduits 25, 26 communicating with both sides of the piston head 23, 24 are connected to both ends of each of the hydraulic cylinders 21, 22, respectively.
6 are selectively connected to a hydraulic pump 29 and an oil reservoir 30 via switching valves 27 and 28, respectively. The piston head 2 also slides within the hydraulic cylinder 21, 22.
3.24 are identically formed piston rods 3 that move forward and backward from one end of the fluid pressure cylinders 21 and 22, respectively.
1.32 is provided, each piston rod 31.32
The tip plunger portions 33, 34 of the two are identically formed. And the diameter D of this piston head 23.24
1 The relationship between the diameter d1 of the piston rod 31°32 and the diameter d2 of the plunger portion 33.34 is D>61≧d2.

A pair of identically formed pressure increasing cylinders 35.3G through which the plunger portions 33.34 move back and forth is also provided, and these pressure increasing cylinders 35.36 are connected to check valves provided in each of the water supply circuits 31 and 38, respectively. It is connected and communicated between 39 and 40. A water replenishment pump 41 is connected to the inlet side of each water replenishment circuit 37, 38, and a high pressure water conduit 42 is connected to the discharge side of each water replenishment circuit 37, 38.
An injection nozzle 44 is provided at the tip side of the cylinder via an orifice 43.

A dog 45.46 is formed on each of the pair of screws 1 to 31.32, and each dog 45.46 operates a limit switch 47.48.49.50.51.52 by moving the piston rod 31.32 back and forth. It is set to work.

Furthermore, relief valves 53 and 54 are connected between the hydraulic pump 29 and the switching valves 27 and 28, respectively.

Next, the operation of this embodiment will be explained.

When the hydraulic pump 29 is driven, the hydraulic pressure is supplied to the first
The piston head 23 of the fluid pressure cylinder 21 is pushed in the direction of the piston rod 31, and the piston rod 31 is advanced. When the dog 45 operates the limit switch 48 just before the end of the advancing stroke of the piston rod 31, the switching valve 2
8 is switched, and hydraulic pressure from the hydraulic pump 29 is applied to the piston head 24 of the second hydraulic cylinder 22, causing the piston rod 32 to advance.

In this way, immediately before the advancing stroke of the piston rod 31, the next piston rod 32 is advanced, and both screw rods 31 and 32 are advanced. When the piston rod 31 that has advanced first advances by a predetermined selected stroke, the dog 45 operates the limit switch 49, the switching valve 21 is switched, and the first fluid pressure cylinder 21
Hydraulic pressure is applied to the piston head 23 in the return direction, the piston head 23 retreats, and from the relationship Q>dl between the diameter of the piston head 23 and the diameter d1 of the piston rod 31, the retraction speed of the piston head 23 is greater than the advance speed. Returning at a high speed, the dog 45 of the piston rod 31 actuates the limit switch 47, and the dog 46 of the second piston rod 32, which is subsequently advanced, actuates the limit switch 51 just before the end of the advancing stroke. ,
Hydraulic pressure in the advancing direction is applied to the first piston head 23, and the first piston rod 31 is moved again to the second piston rod 3.
When the second piston rod 32 activates the limit switch 52 at the end of its advancing stroke, the second piston head 24 quickly returns and retreats, and this operation is repeated in sequence. and pressure booster cylinder 35.3
6 is the plunger part 33.3 of Vinton rod 31.32
4 advances, the water sucked into the pressure booster cylinders 35 and 36 is discharged, the check valves 40 and 40 are opened, and high pressure water is discharged to the high pressure water conduit 42, and this high pressure water flows through the orifice 4.
3 and is discharged from the nozzle 44. Also, when the plunger portion 33.34 of the piston rod 31.32 retreats from the pressure boosting cylinder 35.36, the check valve 39.39 opens, and water is sucked into the pressure boosting cylinder 35.36 from the water supply circuit 37.38. It will be done.

The discharge pressure of high-pressure water discharged from this high-pressure water conduit 42 is determined by the plunger portion 33 of the piston rod 31.32.
Since they are operated in an overlapping manner just before the end of the advance stroke of 34, the water pressure and water flow do not decrease, and the high pressure water conduit 4 when both piston rods 31 and 32 advance.
The pressure of piston head 2 is theoretically doubled as shown by diagonal lines in FIG. 2, but the diameter of the injection nozzle 44 is constant and
The hydraulic pressure determined by the area ratio of the plunger portion 3.24 and the plunger portion 33.34 increases, and the relief valves 53.54 operate to automatically maintain the water pressure and water flow at the set values.

Note that the piston rod 3 of the fluid pressure cylinder 21, 22
Since the advancing speed of 1.32 is determined by the discharge mQ of the hydraulic pump 29, the two sets of cylinders 21.22 have the same dimensions, and the advancing speed of the piston head 23.24 is determined by the displacement mQ of the hydraulic pump 29. Area of the pressure receiving surface on the side π/4D Area of the pressure receiving surface on the retreating side π/4
(D − dl ) is set small.

〔Effect of the invention〕

According to the present invention, the ultra-high pressure water that is increased in pressure and discharged by moving the piston rod back and forth has a constant water pressure and water flow, and can be used for processing such as cutting machines, high-speed moving workpieces, electronic Stable processing can be performed without causing cutting defects or deburring defects when deburring lead frames of parts.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of an ultra-high pressure water generator showing an embodiment of the present invention, Fig. 2 is a basic waveform diagram of the same ultra-high pressure water, and Fig. 3 is a circuit diagram of a conventional ultra-high pressure water generator. Figure 4 is a basic waveform diagram of the ultra-high pressure water shown above. 21, 22... Fluid pressure cylinder, 23.24... Screw 1
Head, 27.28...Switching valve, 31.32...Piston rod, 33.34.◆Plunger part, 35.3
6...Pressure booster cylinder, 37.38...Water supply circuit, 39
．． 40...Check valve, 44...Nozzle, 53.54...Relief valve. March 19, 1985

Claims (1)

[Claims] (1) A pair of piston rods are fitted into a pair of low-pressure side fluid pressure cylinders so that they can move forward and backward, and are moved forward and backward by the switching operation of a switching valve. A pair of pressure increasing cylinders connected between the check valves of the replenishment circuit, a high pressure water conduit connecting the discharge side of the water replenishment circuit and having an injection nozzle at its tip, and the pressure of the fluid pressure cylinder on the low pressure side. relief valves each connected to the source side, the pair of piston rods are alternately advanced to the pressurizing side of the plunger portion with a time difference, and the retraction speed of each piston rod is made faster than the advancement speed. Ultra high pressure water generator.