JPH034804Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention obtains the necessary pressurizing force at the end of the piston movement, increases the moving speed of the piston, and has This invention relates to a hydraulic system that aims to reduce the capacity of an oil storage tank.

(Prior art) A conventional hydraulic system in which a piston having rods on both end faces is inserted into a cylinder, pressurized oil is supplied and discharged into the cylinder on both end faces of the piston to move the piston, and the rod is used as an operating member. is known.

(Problem to be solved by invention) Since the cylinders on both end faces of the piston were designed to be supplied with oil and drained through separate oil supply and drainage pipes, each time the piston was moved, The entire required amount of oil had to be supplied from a pump.

(Means for solving the problem) However, this invention makes most of the oil supply and drainage common to both sides of the piston, so there is no need to move the entire amount of oil with a pump, which solves the problems of the conventional method. That's what I did. That is, this invention is a device in which a piston 2 having rods 3 and 6 at the center of both end faces is inserted into a cylinder 1, and the rods are driven by supplying and discharging pressurized oil to both end faces of the piston. , the rod 3 protrudes outside the cylinder to form an output part, and the rod 6, which is thicker than the rod 3, has a central hole 6a bored from its end surface;
The difference between the cross-sectional area of the central hole 6a and the cross-sectional area of the rod 6 is formed to be smaller than the cross-sectional area of the rod 3, and an oil supply pipe from a pump is connected to the central hole 6a via a switching valve. An oil distribution pipe for supplying and discharging oil to both sides of the piston 2 is connected to an automatic valve 15.
This hydraulic system is characterized by being connected to each other via a switching valve 21 and to an oil supply pipe from a pump 18 via a switching valve 21. The cylinder has two cylindrical bodies connected at the center with a nut. Additionally, oil supply and drainage ports are provided on the side walls of both ends of the cylinder in the area where the piston slides.

(Function) In this invention, the oil distribution pipes used for supplying and discharging oil into the cylinders on both sides of the piston are connected to each other via a switching valve, so a portion of the oil supply and discharge is always carried from one cylinder to the other. As a result, the pressurized oil from the pump only needs to be a small portion of the required oil amount (the difference between the internal volumes of both cylinders), which solves the conventional problems mentioned above and reduces the amount of oil stored. They succeeded in drastically reducing it. Therefore, although it depends on the volume difference between the two cylinders, if the hydraulic system of this invention is adopted, sufficient functionality can be achieved with approximately 1/10 the amount of oil storage tank, and along with this,
The capacity of the hydraulic equipment used can also be reduced.

(Example) Next, to explain an example of this invention, a piston 2 is slidably inserted into the cylinder 1 which is made by connecting two cylinders 1a and 1b with a nut 37, and one part of the piston 2 is inserted into the cylinder 1. The inner end of the rod 3 is connected to the center of the end face, and the other end of the rod 3 is
It penetrates the closing lid 4 of the cylinder 1 and projects outward, and a fixture 5 of an arbitrary processing tool is fixed to the projecting end. The inner end of a hollow rod 6 is connected to the center of the other end surface of the piston 2, and a center hole 6a is bored in the hollow rod 6. An oil supply pipe 7 is inserted into the center hole 6a, and the oil supply pipe 7 is inserted into the center hole 6a. One end of the oil distribution pipe 8 is connected to the oil supply hole 9a of the connecting body 9 fixed to the outer end of the oil distribution pipe 7. The outer end of the oil supply pipe 7 is fixed through the closing lid 4a of the cylinder 1b, and the connecting body 9 of the oil distribution pipe 8 is fixed to the end thereof. In addition, oil supply and drainage ports 10 and 11 are provided on the side wall of the cylinder 1 to maintain the stroke interval of the piston 2 of the cylinder 1, and oil distribution pipes 12 and 13 connected to the oil supply and drainage ports 10 and 11, respectively, are connected to a bypass pipe 14.
The automatic valve 1 is connected to the bypass pipe 14 by
5 (Fig. 3). In the figure, 38 is a flange for fixing the cylinder 1.

The operation of the above embodiment will be explained.

First, in order to move the piston in the direction of arrow 16 in FIG.
The oil in 9 is suctioned and pressurized, and the oil pipe 20 and valve 21 are
As shown by arrows 23, 24, 25, the oil pipe 22 passes through the cylinder 26 and the central hole 6 of the hollow rod.
Supply within a. When the piston 2 moves in the direction of the arrow 16 in this way (as shown in FIG. 1), the volume of the cylinder 26 on one side of the piston 2 increases, so pressurized oil flows through the oil distribution pipe 22 and the check valve 27. The oil is supplied from the oil distribution pipe 12 to the inside of the cylinder 26 through the oil distribution pipe 12. On the other hand, the volume inside the cylinder 28 on the other side decreases due to the movement of the piston, so the oil contained inside is discharged from the oil distribution pipe 13. At this time, by opening the automatic valve 15, the oil distribution pipe 13 and 1
2 are connected. Therefore, the oil in the cylinder 28 will be supplied directly to the cylinder 26, and the piston will move rapidly (because the pressurized oil will be delivered in excess of the pump's capacity). In the above, the pressure of the pressurized oil sent into the cylinder 26 and the hollow rod 6 can be equalized by opening the check valve 30 interposed between the oil distribution pipes 8 and 12 via the branch pipe 29. can.

Thus, once rod 3 reaches the predetermined position,
When the valve 21 is switched, the pressurized oil is moved to the direction indicated by the arrows 23 and 3.
Since the oil is fed into the cylinder 28 through the oil distribution pipe 33, valve 34, and oil distribution pipe 35 as shown in 1 and 32, the piston moves in the reverse direction in the direction of arrow 36 (Fig. 3), and the oil in the cylinder 26 is discharged from the cylinder 28. The oil in the hollow rod 6 is supplied to the cylinder 28 from the oil distribution pipe 13 via the oil pipe 12 and the automatic valve 15, and the oil in the hollow rod 6 is supplied to the oil distribution pipe 8, the check valve 30, the oil distribution pipe 12, the automatic valve 15,
It is supplied to the inside of the cylinder 28 through the oil distribution pipe 13,
Excess oil is discharged from the oil drain pipe 22 via the valve 21 or from the valve 34, and is then discharged from the storage tank 1.
The stroke is returned to 9 and one stroke is completed. The opening/closing or switching of the automatic valve 15, valves 21, 34, etc. in the above is controlled by LS1, LS2, LS3, LS4, etc., which are activated by detecting the movement of the piston. For example, LS1 is the top dead center of the piston, LS
2 is intermediate rise regulation, LS3 is pressurization limit, LS
4 detects the bottom dead center and operates the corresponding relay to open/close or switch automatic valves, etc.

(Effects of the invention) That is, according to this invention, a piston having rods on both end faces is slidably inserted into a cylinder, and oil supply/drainage ports into the cylinder on both sides of the piston are connected to each other by oil distribution pipes. Since an automatic valve is installed in this oil distribution pipe, oil in one cylinder can be guided into the other cylinder as the piston moves. Therefore, when the piston is moved, oil is alternately supplied to and discharged from the cylinders on both end surfaces according to changes in the respective volumes. Therefore, only a small amount (for example, 1/10) of the moving pressurized oil needs to be sent under pressure from the pump, which requires a significantly smaller oil feed pump, valve, and oil storage tank compared to the capacity of the hydraulic system. There are effects that can be used. Furthermore, since oil is supplied and discharged in the cylinder smoothly and efficiently, the moving speed of the piston can be significantly increased, and the efficiency of such a hydraulic system can be improved. Naturally, the return of the piston is also dependent on hydraulic pressure.

According to the hydraulic system of this invention, the pressurizing force during movement does not reach the rated value, but the final pressure is naturally the rated value, so it can be used in machinery where only the final pressurizing force is a problem, such as the hydraulic system of a press equipment. be able to.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of an embodiment of this invention, FIG. 2 is a side view, and FIG. 3 is a schematic diagram showing the oil distribution system. 1...Cylinder, 2...Piston, 3...Rod, 6...Hollow rod, 7...Oil supply pipe, 8,1
2, 13, 22... Oil distribution pipe, 10, 11... Oil supply/drain port, 18... Pump, 19... Oil storage tank.

Claims (1)

[Claims for Utility Model Registration] 1 Rod 3 in the center of both end faces into the cylinder 1,
In a device in which a piston 2 having a piston 6 is inserted and the rod is driven by supplying and discharging pressurized oil to both end surfaces of the piston, the rod 3 protrudes outside the cylinder to form an output part, The rod 6, which is formed thicker than the rod 3, is provided with a central hole 6a from its end surface.
The difference between the cross-sectional area of a and the cross-sectional area of the rod 6 is formed to be smaller than the cross-sectional area of the rod 3,
An oil supply pipe from a pump is connected to the central hole 6a via a switching valve, and the piston 2
The oil distribution pipe that supplies and drains oil on both sides is an automatic valve 15.
The hydraulic system is characterized in that it is connected to the oil supply pipe from the pump 18 via a switching valve 21. 2. The hydraulic system according to claim 1, wherein the cylinder has two cylindrical bodies connected at the center with a nut. 3. The hydraulic system according to claim 1 of the utility model registration, characterized in that oil supply and drainage ports are provided on the side walls of both ends of the cylinder in the section in which the piston slides.