SU603778A1 - Hydraulic system for step-by-step motion of hydraulic cylinder piston - Google Patents

Description

(54) HYDRAULIC SYSTEM FOR CREATING A STEP MOVEMENT OF A HYDROLINDER PISTON

The invention relates to hydraulic devices used in metal forming.

The known hydraulic system for creating a stepping movement of the piston of the hydraulic cylinder, which contains a distributor, communicating with the working cylinder and the hydraulic cylinder and made in the form of a rotating cylinder, with uniformly circumferentially spaced through channels, which can be located either on the periphery or on the cylinder 1 face.

However, such a hydraulic system has insufficient pitch stability at different frequencies and different working pressures of the fluid.

Also known is a hydraulic system for creating a stepped displacement of a piston of a hydraulic cylinder, comprising a distributor in communication with the working cavity of the hydraulic cylinder, and a dispenser 2.

The distributor and dispenser of the known hydraulic system are made in the form of separate reciprocating hydraulic elements. The distributor alternately communicates the outgoing cavity of the hydraulic cylinder with the opposite cavities of the dispenser, and during the charging of one of the cavities, the other is discharged into the drain.

This hydraulic system has a complex structure.

The aim of the invention is to construct hydraulic system Nnpoinciiiie.

It is achieved by the fact that the distributor and dispenser are made at the same time in the form of a cylinder with blind channels, installed with the possibility of rotation in a sleeve with two openings, one of which communicates with the working cavity of the hydraulic cylinder, and the other with a drain.

Deaf channels are bent in the direction opposite to the direction of rotation.

Deaf channels are made at the end of the cylinder. In the form of grooves.

Claims (2)

FIG. 1 given the design option, providing step movement of the hydraulic cylinder piston when moving up; in fig. 2 option providing step movement at piston movement down; in fig. 3 is a variant allowing to obtain a reciprocating movement of the porn around the middle position; in fig. 4 - hydrocyo.indr with built-in adjustable throttle; in fig. Gg hydraulic cylinder with built-in battery; in fig. 6 - rotating cylinder with oblique blind channels; in fig. 7 —a rotating cylinder with a blind hole and channels formed at its end; in fig. 8 - cylinder with channels at both ends. In the rigid casing 1 containing the inlet 2 and outlet 3 channels, a rotating cylinder 4 is located with evenly spaced deaf channels 5. The cylinder rotates on axis 6. The inlet channel 2 is connected to the crankshaft 7 of the hydraulic cylinder 8, which is connected through valve 9 with the pump 10. The crush cavity 11 through the valve 12 is also connected to the pump 10. Porsche 13 carries the working platform 14. In addition, the cavity 11 through the valve 15 and the drain pipe 16 is connected to the tank 17. With the valve 12 open and closed valves x 9 and 15, pump 10 creates The oil pressure in the cavity 11 is acute. Porsche 13 transmits this pressure to the oil located in the annulus 7 and to the oil in channel 2. The rotating cylinder 4 periodically leads to the mouth of channel 2 empty measuring volumes 1 — deaf channels 5. The liquid cyclically flows into them and its number cyclically (synchronously the rotational speeds) decreases hydrocyli-8 in the overpiston cavity 7. As a result, the piston 13 under the action of pressure in the cavity II cyclically starts to move the platform 14, creating a pulsation of the liquid. After turning the cylinder 4, the deaf channels 5, falling into the lower position, are released from the oil, which flows by gravity into the tank 17. To return Porsch 13 with the platform 14 to the lower position, the valve 12 is closed, and the valves 9 and 15 are opened, and with a stationary cylinder 4, the oil is pumped into the overpressure cavity 7. The piston 13 is lowered and squeezes the oil out of the cavity 11 through the drain pipe 16 into the tank 17. To decrease the capacity and pump 10, the system has a hydropneumatic accumulator 18, which is periodically charged in m ments when Input Channel 2 blocked the mouth of the cylinder wall 4, i.e. between cycles of injection of fluid into the blind ducts 5, and then, together with the pump, it pumps fluid into the cavity 11. The design of the cylinder 4 provides injection of a constant amount of fluid into its blind ducts 5, regardless of the number of revolutions of the cylinder 4, i.e. at any pulsation frequency of the working platform 14, the amplitude of its pulsations remains constant. There are various options for the system with the proposed cylinder. For example, switching inlet pipelines at cavities 7 and 11 provides a reverse pulsating movement of the platform 14- down (see Fig. 2); The connection of the cavities 7 and I through the throttle 19 (see Fig. 3) of the piston 13, and with it the working platform 14, provides reciprocating oscillations (vibrations) near the middle position; By adjusting the throttles 19, it is possible to achieve that the gap 13 oscillates with different magnitude of the stroke in different directions, which ensures the vibrational movement of the slit in one direction, etc. Moreover, the throttle 19 can be located in the pistol 13 (see Fig. 4), and the battery 18 can be located inside the hydraulic cylinder 8 (see Fig. 5). To adjust the amplitude, it is necessary to change the volume of the blind channels 5. In order to ensure that the channels 5 are completely free from waste oil, they must be bent in the direction opposite to the direction of rotation of the cylinder 4, as in the centrifugal pump impeller (see Fig. 6). When oil is injected into channel 5, the air there is compressed and helps the fluid under the action of centrifugal forces to leave channels 5. The shape of channels 5 also contributes to this. Deaf channels of cylinder 4 can be located as at the periphery of the cylinder (see FIG. 1 -5), and at its end (see Fig. 7). This simplifies the device. In order to facilitate the release of the channels 5 from the waste oil, they are made in the form of grooves with a variable radius of curvature, increasing from the center to the periphery of the cylinder 4. To remove the impulse loads of the cylinder 4 from the oil injection with greater pressure, it is advisable to position the input channels 2 on two opposite sides of the cylinder 4 (see, for example, FIG. 8). Thus, the hydraulic system for creating a shag displacement of a hydraulic cylinder of a hydraulic cylinder allows a constant magnitude of the schag, independent of the frequency of the schigs and the pressure of the working fluid. Claim 1. Hydraulic system for creating schagovy displacement of hydraulic cylinder, containing distributor in communication with working cylinder of hydraulic cylinder, and dispenser, characterized in that, in order to simplify the design, distributor and dispenser are integrated in the form of a cylinder with blind channels rotation in a sleeve with two openings, one of which communicates with the working cavity of the hydraulic cylinder, and the other with a drain. 2. The hydraulic system of claim 1, wherein the deaf channels are bent in the direction opposite to the direction of rotation. 3. The hydraulic system according to claim 1, characterized in that the deaf channels are formed in the end face of the cylinder in the form of grooves. Sources of information taken into account in the examination: 1. V. Baranov and Yu. E. Zakharov. Electrohydraulic and hydraulic vibration mechanisms M., 1966, p. 27, fig. 9. 2. Bogdanovich L. B. Volumetric hydraulic actuators, Kiev, “Technique, 1971, p. 69, fig. 34 t G / / fig 2  Zt Fig-s Fig.e ifut.8