SU1507223A1 - Electrohydraulic system for controlling mounted implements - Google Patents

Abstract

The invention is intended for automated control of the position of mounted agricultural implements. The purpose of the invention is to increase speed. The system consists of a pump 1 with a feed control channel 4, a hydraulic distributor with a control spool 2, a first electrically controlled spool 18 and a second electrically controlled spool 19, a hydraulic cylinder 14 for lifting the operating elements, the cavities of which are connected to spools 18 and 19 and with the hydraulic distributor. In addition, the system contains selective valves 5, 6, 7, and 29. Through valves 5 and 7, the pump supply control channel 4 is connected to spools 18 and 19 and to end cavities 16, 17 of control spool 2. Through valves 5, 6 and 29 channel 4 is connected to the drain. The pump 1 is connected via a spool 18 to the spool 19. The system also includes a spool switch 46 and a three-position spool 39, the last input by channel 37 is connected to its face cavity 38 and the channel 36 to the spools 18 and 19. The first output of the spool 39 is connected to channel 41 its opposite end cavity 40 and channel 42 - with the input of spool switch 46. The second output of spool 39 by channel 50 is connected to the end cavity 17 of control spool 2. The first output of spool switch 46 by channel 48 is connected to its end cavity 47 and channel 44 -the piston cavity of the hydraulic cylinder 14. The second output of the spool-switch 46 by the channel 51 is connected to the front cavity 17 of the control spool 2. The front cavity 17 through the channels 21,23,22 and 52,24 and non-return valves 53, 49 is connected to the spool 19. Initially The position of the pump control channel 4 through valves 5, 6 and 29 is connected to the drain. The pressure and oil supply of pump 1 is minimal. When the electromagnet of the spool 19 is turned on, the oil from the pump 1 enters the flow control channel 4 and into the end cavity 38 of the spool 39. The spool 39 moves, through the first outlet and the spool 46 supplies oil to the piston cavity of the hydraulic cylinder 14, and through the second outlet - to the front cavity 17 control spool 2. Hinge mechanism 15 moves upwards. When the electromagnet of the spool 18 is turned on, the spool 2 moves to the "lowering" position. The hitch 15 is moved down. When both spools 18 and 19 are turned on, control spool 2 moves to the position Floating. The linkage can be freely lowered and raised according to the floor relief. 2 hp f-ly, 1 ill.

Description

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rollover roller 19. hydraulic cylinders 14 for lifting the working bodies, the cavities of which are connected to spools 18 and 19 and to a hydraulic distributor. In addition, the system contains selective valves 5, 6, 7, and 29. Through valves 5 and 7, the pump supply control channel 4 is connected to spools 18 and 19 and to the end cavities 16, 17 of control spool 2. Through valves 5, 6 and 29 channel 4 is connected to the drain. Pump 1 through the spool 18 is connected to spool 19. The system also contains a spool-switch 46 and a three-position spool 39, the input of the latter by channel 37 is connected to its face cavity 38 and channel 36 - to spools 18 and 19. The first output of the spool 39 by channel 41 connected to its opposite end cavity 40 and channel 42 - to the input of spool-switch 46. The second output of spool 39 by channel 50 is connected to the front end 17 of control spool 2. The first output of spool-switch 46 is connected to channel 48 and end face 47 and channel 44c n rshnevoy cavity of the hydraulic cylinder 14. The second output 46 zolotnikapereklyuchatel channel 51 is connected with the end cavity 17 yppavl yusche o spool 2. The end member cavity 17 through the channels 21, 23, 22 and 52, 24 and check valves

53, 49 is connected to the spool 19. In the initial position, the channel 4 controlling the pump flow through the valves 5, 6 and 29 is connected to the drain. The pressure and oil supply of pump 1 is minimal. When the electromagnet of the spool 19 is turned on, the oil from the pump 1 enters the flow control channel 4 and the front cavity 38 of the spool 39. The valve 39 moves, through the first outlet and the valve 46 supplies oil to the piston cavity of the hydraulic cylinder 14, and through the second output - to the front cavity 17 of the control spool 2. The hitch 15 is moved upwards. When the electromagnet of the spool 18 is turned on, the spool 2 moves to the "Lowering. The hitch 15 is moved down. When both spools 18 and 19 are turned on, control spool 2 is moved to the position Floating. The linkage can be freely lowered and raised according to the floor relief. 2 hp f-ly, I ill.

The invention relates to agricultural machinery and can be used for automated control of the position of mounted agricultural implements.

The purpose of the invention is to increase speed.

The drawing shows a schematic diagram of an electro-hydraulic control system with a four-position control spool.

The electro-hydraulic control system of the mounted implements contains a hydraulic pump 1 of adjustable capacity, control spools 2 and 3 of the hydraulic distributors of the process equipment, channel 4 of the pump flow control, selective valves: the first 5, third 6, and the second 7. Hydraulic pump 1 is connected by channel 8 to the spools 2 and 3, which have hydraulic connections to the discharge port 9. The spools 2 and 3 are provided with latches 10 and 11. The spool 2 has channels 12 and 13 connected to the hydraulic cylinder 14 for lifting the hitch mechanism 15. The end-face cavity 16 of the control spool 2 and the opposite end-face cavity 17 are connected respectively to the first and second electrically-controlled spools 18 and 19, respectively, channel 20 and channels 21, 6, 22 via the control-shaft 23, spool 2. The end-face cavity 17 is connected to the electrically controlled spool 19 additional channels 24. Channels 20 and 22 through the spools 18 and 19 are connected to the channel 25 of the drain. Spools 18 and 19 are connected by a channel

5 26. Channels 27 and 28 connect the selective valves fourth 29 and 30 to the selective valves 6 and 5.

The hydraulic pump 1 is connected to spools 2 and 3 by channel 8 through flow valves 31 and 32. Channel 33 hydraulic pump is connected to the spool 18. Spool 19 channels 34 and 35 is connected to the selection valve 7. Channel 26 is connected to channel 36, which is connected to the inlet and through channel 37 - to the front

5 cavity 38 three-position spool 39. The opposite end cavity 40 three-position spool 39 channel 41 is connected to the first output of the three-position spool, which channels 42, 43, 44 and 45 are connected to channel 13 through

0 spool switch 46, the end cavity 47 of which by channel 48 and channel 43 is connected to the first output of the switch spool and to channel 44. With channel 24 equipped with a check valve 49, are connected: the second output of spool 39 5 channel 50, the second output of the spool the switch 46 - channel 51, and the channel 52 through the check valve 53. In addition, the valve 19 through the channels 54

and 55 is connected to the channel 12 and through the channel 56 and the check valve 57 - with the channel 58 of the drain. Control spool 2 has four positions: “Raise,” Neutral, “Lowering (Forced),” Navigating. In the “Rise and” position, the lowering of the spool 2 is not fixed. Spool 3 is similar to control spool 2, it is provided with fixation in all positions and is intended for technological purposes.

Electro-hydraulic system works as follows.

Control spool 2 is set to the Neutral from the Rise and Lower Position automatically under the action of the spring force in a known manner. When the electromagnets of the spools 18 and 19 are turned off, through the spools 18 and 19, the end cavities 16 and 17 of the control spool 2 are connected to the drain, respectively, by channels 20, 25, 58, and 21, 23, 22, 25, 58. The control spool 2 is in position "Neutral. Channel 4 of the pump flow control is connected to the drain via the selective valves 5 and 30, channels 28, 9 and spool 3. As a result, the system 1 provides the minimum flow rate and minimum pressure. The channels 12 and 13, connected to the hydraulic cylinder 14 of the lifting of the linkage mechanism, are locked by a control spool. At the same time, the oil pressure in the piston cavity of the hydraulic cylinder 14, created by the weight of the agricultural crop, is supplied through the channels 45, 44, 48 to the end cavity 47 and holds the spool switch 46 in the extreme left m position. The same pressure through the channels 43, 42, 41 and the spool 46 is supplied to the opposite end cavity 40 of the three-position spool 39 and holds it in the rightmost position. When the electromagnet of the spool 19 is turned on, the latter moves to a different position and the oil from the pump 1 channels 33, 26, 36, 37 enters the end cavity 38 of the spool 39, as well as the channel. 35 and 34 through the selective valves 7, 6, 5 - into the channel 4 pump feed controls. At the same time, the oil enters the channel 24 and closes the check valve 49. The pressure of the pump 1 rises and, having exceeded the pressure in the piston cavity of the hydraulic cylinder 14 by a differential determined by the spring force of the spool 39, moves the spool 39 to the left. Through the throttle of the spool 39, the oil from the pump channels 42, 43, 44, 45 enters the channel 13 of the piston cavity of the hydraulic cylinder 14. From the hydraulic cavity of the hydraulic cylinder, the oil is drained by channels 12, 55, 54, 25, 58. The low-speed suspension mechanism starts moving up. At the time of the hitch mechanism movement, the difference between the end

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cavities 40 and 38 of spool 39 increase. The spool 39 moves further to the extreme left position, and the oil also flows from the pump into the cavity 17 of the control spool 2 by channels 50 and 24. The control spool 2 moves to the "Lift and main oil flow from the pump channels 8 and 13 through valve 31 begins enters the hydraulic cylinder 14. The latter moves the hitch up. If the solenoid of the slide valve 19 is turned off manually or automatically, the slide valve 19 is returned to its original position by the spring force. The spring force returns to the position "Neutral and control spool 2. Channels 12 and 13 overlap and the hitch mechanism 15 occupies a new position.

When the electromagnet of the spool 18 is turned on, the latter moves to a different position. Under the weight of the farm, the oil from the piston cavity of the hydraulic cylinder begins to be squeezed out onto the drain through the channels

13.45, 25, 58, and the oil is sucked into the rod cavity through the channels 58, 56, 55, 12 and the check valve 57. The hitch mechanism slowly begins to descend. At the same time, the oil flows through the selective valves 7, 6, 5 into the pump control channel 4 and through the channel 20 into the front cavity 16 of the control spool 2. The pump pressure increases and the valve 2 moves to POSITION "Lowering and stopping, because channel 23 overlaps spool 2, and channel 24 overlaps spool 19.

Oil from pump 1 through channels 8 and 12 through valve 31 enters the hydraulic cylinder

14, which, without slowing down, moves the hitch mechanism down. If the electromagnet of the slide 18 is manually or automatically switched off, the slide 18 by the spring force returns to its original position. The spring force returns to the Neutral and Control Spool 2, cutting off the channels 12 and 13, and the hitch mechanism stops. If electromagnets of spools 18 and 19 are turned on at the same time, electrically controlled soot, 1, 18 and 19 move to second positions and connect channels 12 and 13, respectively, through channels 55 and 54 and through channel 45 to channels 25 and 58 of the drain. At the same time, the oil from the pump enters through channel 20 into the end cavity 16 of control spool 2 and into channel 4 of the control and pump feed. Control spool 2, remepAI-. Camping down is set to the Floating position, as channel 24 through spool 19, channels 25 and 58 are connected to the drain. In the position of the floating control spool 2 is held by a latch 10. Therefore, when the electromagnets are gold

NIKS 18 and 19, the spools 18 and 19 are turned off, they return to their initial positions, the control spool 2 remains in the position "Floating." In this position, channels 12 and 13 of hydraulic cylinders 14 are connected with a drain, communicated with a drain and channel 4 of the pump supply control - the hydraulic pump is unloaded. The hitch mechanism 15 can be freely lowered under the weight of the cannon or moved upwards when the terrain of the treated floor is changed. Due to the fact that the pressure in the piston cavity of the hydraulic cylinder 14 is close to zero, the spool 46 moves to the extreme right position and closes the channel 43, and the channel 42 connects to the channel 51. When the electromagnet 19 is turned on, the latter moves to another position, and the oil from the pump channels 36 and 37 enters the front cavity 38 of the spool 39 and moves it to another position. From channel 36 by channels 42, 51, 54, the oil enters the front cavity 17 of spool 2, and also through the selective valves 7, 6, 5 - into channel 4 of the pump feed control. The pressure of the pump is equalized and the spool 2, having overcome the resistance of the latch 10, moves to the position "Neutral or" Raise.

Claims (3)

1. Electro-hydraulic control system of mounted implements, containing a hydraulically connected pump with a feed control channel, a hydraulic valve with a control spool, two electrically controlled spools, a hydraulic cylinder lifting 5 5 0 0 five The primary organs and the selective valves, through the first and second of the two channels, control the pump feed flow to the electrically controlled spools and to the front cavities of the control valve of the hydraulic distributor and to the first, third and fourth spool valves, and the pump is connected to the first electrically controlled valve. a spool with a second electrically operated spool, characterized in that, in order to increase speed, the system is equipped with a three-position spool, the input of which is connected to its face cavity and to electrically controlled the loaders, the first outlet of which is connected with its opposite end cavity, and the second outlet - with the opposite end cavity of the control spool, the piston cavity of the lifting cylinder of the working bodies is connected to the first electrically controlled spool, and the pinhole cavity is connected to the second electrically controlled spool and non-return valve - with drain. 2. The system according to claim I, characterized in that it is equipped with a spool-switch, the input of which is connected to the first output of the three-position spool, the first output of the spool-switch is connected to its face cavity and to the piston cavity of the hydraulic cylinder of the lifting of the working bodies, and the second output - with opposite face cavity of the control valve spool. 3. The system according to claim 1, characterized in that it is provided with non-return valves, through which the opposite face of the control valve spool of the hydraulic distributor is connected to the second electrically controlled valve.