SU366281A1 - HYDRAULIC DRIVE RETURN MOTION - Google Patents

Description

one

The invention relates to hydraulic actuators of reciprocating movement with automatic 1M switching of the direction of movement to the edge: their positions by sequential switching of valves with mechanical and hydraulic control.

Hydraulic actuators of return and constant-translational motion are known, containing a constant-capacity pump with an overflow valve, a hydrocylide, whose stem-ov cavity is permanently connected to the discharge line of the pump, and the valve is alternately connected through a distributor with mechanical control and a distributor with hydraulic control with pump discharge line or with discharge. The distributor with hydraulic control 1M has two end control chambers, alternately communicated through a mechanically controlled distributor control unit with a discharge line or with a drain. When reversing the hydraulic cylinder, pressure is injected in the discharge line of the pump due to the inertia of the overflow valve.

In the proposed hydraulic actuator, the distributor with hydraulic control has two pairs of additional windows and two additional windows, and in the control part of the distributor with mechanical control

A consistent overlap of the pressure port is provided, which together provides a message to the pump discharge line through the resistances with the drain during the switch-over period with mechanical control and to part of the switch-over period with hydraulic control.

The drawing shows the basic scheme of the described hydraulic system; water.

The piston 1 of the power cylinder is connected to the executive body 2, on which the cams 3 are mounted. The rod A and the hydraulic cylinder are permanently connected by line 4

with the discharge line 5 of the pump (not shown). The piston cavity B of the hydraulic cylinder is connected by line 6 with the working window 7 of the spool valve 8 with mechanical control. The spool 9 of the distributor is connected to the two pushers // via the rail and gear 10, with which the cams 3 interact at the end of the working movement. The distributor 8 also has two windows 12 and 13, which are alternately locked through the sleeves 14, 15 of the spool 9 and communicating with the window 7. The distributor has a second control part formed by flow 15, 16 and / 7 spool 9, pressurized OKiHOM 18, with two working windows 19, 20 and

two drain ports 21, 22. The pressure port 75 is constantly in communication with the injection line 5. The windows 2, 13 of the distributor 8 are connected by lines 23, 24 to the working mn windows 25, 26, corresponding to the distributor 27 with hydraulic control. The distributor 27 has additional axes 30, 31 and 32, 33. The distributor spool has workers 34, 35, 36 and trailer additional 37, 38. At the distributor window 28, the distributor 27 is reported by line 39 with the discharge line 5, and Windows 28, 29 communicated with the drain; About 30 via parallel-installed choke 40, return valve 41 n line 42 is reported with distributor window 19 8. Window 31 through parallel-installed choke 43, return valve 44 and line 45 communicate with distributor window 20, and windows 32 and 33 through resistances 46 and 47, respectively, are communicated with the drain. The end chambers 48, 49 communicate with lines 42 and 45, respectively, and back valves 50, 51.

In the diagram, the spools of valves 8 and 27 are depicted in positions that ensure the communication of the hydraulic cylinder cavity B with the discharge line 5 through LINE 6, window 7, Gap between ports 14, 15 of valve 9, window 13, lily 24, window 25, groove between distributor 35, 36 spool valve 27, window 28 and line 39. At the same time, the sensor window 18 of the valve 8 is communicated through window 19, line 42 and non-return valve 50 with control chamber 48. Control chamber 49 through window 31, throttle 43 , line 45, windows 20 and 22 communicated with the drain, resulting in a spool redelitel 27 is held in the right end position. The piston / and the working body 2 are moved to the left. When approaching them to the extreme, the right cam 3 comes into contact with the right pusher //, moving its vyiz and causing the pinion 10 to turn clockwise and the dispensing valve 8 to move to the left. When the spool to the left, juice 15 goes to window 13 and gradually closes it. By juice 15 opens. Simultaneously, the juice 16 of the control part of the distributor passes through window 18, providing communication with the window 20, and juice 17 closes the drain 22, the compartment from the drain through juice 16. Since window 20, through line 45, non-return valve 44, the window 31, the window 33 and the throttle 47 are communicated with the drain, the pump from the line 5 through the window / 8 is pumped as far as the pumpom and then, as described above, is discharged to the drain, thereby preventing the pressure drop in the line 5 from overlapping the window 13. The choke 33 is selected so that the pressure in line 6 is kept constant m level.

At the end of the stroke of the distributor spool

8 it opens the drain window 2J along the juice 15, together with the window 19 and, therefore, with the control chamber 48 of the distributor 27 via line 42, the throttle 40 and the window 30. The low pressure in the chamber 48 causes the distributor 27 to move to the left with acceleration, caused by an increase in open windows 31 and chamber 49 and an additional message from chamber 48 through windows 30 and 32 with a drain. At the end of the stroke of the slide valve, hydraulic braking occurs as a result of locking the chamber 48.

After rotating the distributors, the piston cavity B of the hydraulic cylinder communicates with the drain through port 6, windows 7 and 12, line 23, windows 24 and 29, and the piston 1 with the working organ 2 begins to move to the right.

Tor.mobilization of the piston at the end of this stroke 0 and reversal of the valves occurs as described above.

Subject invention

5 Hydraulic reciprocating

movement with automatic switching of the direction of movement in the extreme positions, containing a hydraulic cylinder, the rod cavity of which is permanently connected to the discharge line of the pump of constant performance, a two-hydraulic spool valve with hydraulic control, having a pressure window communicated with the discharge line of the pump,

35 at least one drain window, two working windows and two end control chambers, as well as a twin mechanically controlled twin-directional spool valve, switched by stops on the movable part of the gyrocylinder or a working body connected with it, and having the first three-line part serving for alternate communication piston cavity of a hydraulic cylinder with working windows of the distributor

45 is hydraulically controlled, and the second five-line part serves to alternately connect the distributor control chambers with hydraulic control with a discharge line and a drain, characterized in that, in order to reduce pressure fluctuations in the pump discharge line while reversing the hydraulic cylinder with a minimum reversal time , the distributor with hydraulic control is equipped with two additional skids.

two additional end windows communicated with working windows of the second part of the distributor with mechanical control parallel to the control chambers, and two additional windows of drain windows / m communicated with the drain through the throttles and serving to communicate the working windows of the second part of the distributor with mechanical control with drains in the period switching the distributor with mechanical control and part of the switching period of the distributor with hydraulic leveling.