SU1751551A1 - Hydraulic drive - Google Patents

Abstract

The invention relates to engineering hydraulic drive and can be used in the hydraulic systems of machines and installations of the tea industry. The purpose of the invention is to increase the reliability of work by reducing the starting point of the working body. The hydraulic actuator contains a pump connected through a distributor with a hydraulic motor connected via a coupling to the shaft of the working body. The distributor spool is connected to a nut mounted on the distributor case, the thread is not self-braking, with an adapter installed with a backlash equal to half the working stroke of a / 2 spool.

Description

The invention relates to engineering hydraulic drive and can be used in the hydraulic systems of machines and installations of the tea industry.

The purpose of the invention is to increase the reliability of work by reducing the starting point of the working body.

The drawing shows a diagram of a hydraulic drive.

The hydraulic actuator of the working body contains a tank 1, a pump 2, a distributor 3, a hydraulic motor 4. an elastic coupling 5, which is mounted on the shaft 6 of the hydraulic engine 4 by means of splines, and on the shaft 7 of the working body - through a thread, between the shoulder of the shaft 7 of the working body and the elastic coupling 5, a spring 8 and a thrust bearing 9 are installed. The pump 2 is connected by pipe 10 to the channel 11 of the distributor 3 and the channel 12 of this valve by pipe 13 is connected to the tank 1. The valve 3 by pipe 15 is connected to the inlet 16 of the hydraulic motor 4. and to the output 17 of the same

hydraulic engine 4 - pipeline 18. Between pipelines 15 and 18, a bypass valve 19 is installed.

The spool 14 of the distributor 3 discharged from the pressure is connected with a finger 21 by means of an adapter 20, the axial play of which is equal to half the stroke of the spool 14. The finger 21 along the length of the stroke a / 2 of the spool 14 has a non-brake multi-way thread 22 on the distributor housing 3 by a nut 23, the ends 24 and 25 of the threaded turns 22 and 26 are cut on the nut 23 and on the finger 21 along the axis (the cut ends 24 and 25 are shown in dashed lines).

Hydraulic drive of the working body works as follows.

When the position of the hydraulic drive is off, the spool 14 of the distributor 3 is in the off position, at which time the channels 11 and 12 are connected to each other.

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When the hydraulic actuator is turned on (for the operator, the lever 27 of the distributor 3 has two positions: on - position B, off - position deceleration of the spool - position P, thereby reversing the hydraulic engine 4 is performed by itself) spool 14 with lever 27 of the distributor 3 is translated into Position B, the passage at that position of the reverse P. At position P, the output 17 of the hydraulic motor 4 is connected to the channel 11, and the input 16 is connected to the channel 12, and the hydraulic engine 4 starts rotating in the opposite direction. In position B, channel 11 is connected to input 16 of hydraulic motor 4, and output 17 is connected to drain channel 12. And hydraulic motor 4 starts to rotate clockwise.

At the moment of the start of rotation of the shaft 6, the spring-loaded elastic coupling 5 is screwed onto the threads of the shaft 7 of the working element and moves in the axial direction, while the spring 8 is compressed until the spring force is equalized by the applied load. The result is a relative rotation of the shafts 6 and 7 at an angle proportional to the amount of deformation of the spring 8, and the shaft 7 of the working body begins to gradually gain momentum.

When the hydraulic actuator is turned off, the spool 14 of the distributor 3 with the manual control lever 27 is switched to the off position 0. Pass through the intermediate reverse (P) position, where the flow direction of the oil entering the hydraulic motor 4 changes and the clutch 5 begins to move in the opposite direction.

Thanks to the appropriate size of the non-braking thread 23 and 22 and the play between the spool 14 and the finger 21 (which is equal to half the stroke of the spool), the free transfer of the spool from position 0 to position B and

on the contrary, and the retardation of the stroke of the spool 14 to the position P, thereby keeping the spool 14 in the reverse position for the time required for the spring to return to its initial position, is carried out without the attention of the operator. (The required time for: the spool holder 14 in the reverse position is obtained by selecting the size and pitch of the non-braking thread). In the case of the delay of the spool 14 in the reverse position more

Claims (1)

the time required for the elastic clutch 5 to return to its original position as soon as the elastic clutch 5 rests against its stroke limit, i.e. a non-return valve 19 opens, which is adjusted to a slight pressure, and oil circulates through it. The invention of the hydraulic actuator of the working body containing a pump connected through the distributor with the hydraulic motor of the working body, the spool of the distributor is provided with a braking device, and the shaft of the hydraulic motor is connected to the working body through a coupling, characterized in that in order to increase the reliability of work by reducing the starting torque of the working body, the braking device is made in the form of a screw-drive screw-nut, the thread is made non-braking, the nut mounted on the housing, the distributor, and the spool is connected to the nut through a threaded pin mounted on the spool with the possibility of backlash equal to half the stroke of the spool. I gtm . g / 9