SU909355A1 - Hydraulic drive - Google Patents

Description

(54) HYDRAULIC DRIVE

one

The invention relates to volumetric hydraulic drives of automatic lines, complexes and other machines and can be used as a drive for the mechanisms of these machines, in whose power hydraulic lines it is necessary to maintain different pressure levels of the working fluid with minimal heat losses.

The hydraulic actuator is known, it contains a pump connected by pressure hydraulic line with a check valve with a pneumohydraulic accumulator and, through an electrically controlled distributor, an actuator, a pressure relay connected to the accumulator hydraulic cavity and electrically connected to the safety valve 1.

The disadvantage of this hydraulic drive is that it does not ensure the operation of several executive bodies at different pressures.

The purpose of the invention is to expand the functionality of the hydraulic drive through the operation of ensuring the operation of several executive bodies at various pressures.

and a given sequence of battery charging.

This goal is achieved by the fact that the hydraulic actuator contains additional pressure hydraulic lines according to the number of actuators, each of which is equipped with a pneumohydraulic accumulator and pressure relay, the batteries are communicated with. each pump through a sequentially installed electrically controlled valve and a check valve, the output of the first battery communicating with the outlets of the next one through two electrically controlled

10 of the distributor, and between the pump and the non-return valve of the first accumulator, an additional electrically-controlled distributor is installed, in this case an electr. In each of the accumulator dispensers of each battery, the disconnecting contact of its pressure relay and the closing contacts of the pressure switch of other batteries are sequentially connected, and the disconnecting contacts of the pressure switch of all accumulators are connected in parallel with the electromagnet circuit of the safety valve.

Claims (1)

FIG. Figure 1 shows the hydraulic circuit of the hydraulic drive; in fig. 2 - electrical circuit providing battery charging in the sequence: high, medium and low charging battery; in fig. 3 is an electrical circuit providing an inverse battery charging sequence. The hydraulic actuator contains a pump 1, connected by a pressure hydroline 2 with a check valve 3 with a pneumohydraulic accumulator 4, to the hydraulic cavity 5 of which pressure relay 6 is connected, and through an electrically controlled valve 7 to a high-pressure executive (not shown). An additional electrically controlled valve 8 is installed between pump 1 and check valve 3, and a safety valve 9 with an electromagnet 10 is connected to the hydraulic line 2, the hydraulic actuator also contains pressure hydraulic lines 11 and 12 communicated with the actuators, respectively, of medium and low pressure (not shown), each of which has a pneumohydraulic accumulator 13 and 14 with a pressure switch 15 and 16, respectively. The accumulators 13 and 14 communicate with the pump 1 through successively installed electrically controlled valves 17 and 18 and check valves 19 and 20, respectively. The output 21 of the battery 4 communicates with the output 22 of the battery 13 through electrically controlled valves 7 and 23, and with the output 24 of battery 14 through electrically controlled valves 7 and 25. The pump 1 is also communicated through electrically controlled valve 26, the pressure in which exceeds the pressure in hydrolines 11, 12 and 28. Hydrolines II, 12 and 2 are equipped with, respectively, safety valves 2931. Valves 29 and 30 are set to a pressure that prevents overloading, respectively, of batteries 13 and 14, and valve 31, to a pressure greater than the setting pressure of valve 9 to ensure the operation of actuators connected to hydraulic line 27 (not shown). The distributors 7, 8, 17, 18, 23 and 26 are controlled by electromagnets 32-38, respectively. An electromagnet 10 of valve 9 is connected in parallel with a pressure relay 6, 15, and 16, which are opening contacts; an electromagnet 34 of a distributor 17 of battery 13 is connected in turn with a disconnecting contact of pressure relay 15 and a closing contact of pressure relay 16, of battery 14. The hydraulic actuator works as follows. When the battery 4, 13 and 14 is discharged, the electromagnet 10 of the safety valve 9 is turned on through a parallel circuit of the disconnecting contacts of the pressure relay 6, 15 and 16, ensuring that the pressure is maintained in the system. In this case, the electromagnet 34 is de-energized by the closing contact of the relay 1 &, the electromagnet 35 is turned on, the connection of the battery 14 to the pressure hydroline 2 - the accumulator 14 is charged, because the pressure in the battery.4 is larger than the pressure in other batteries. After charging the battery 14, the electromagnet 34 is turned on, ensuring the charging of the battery 13. Its charging is the last to charge the battery 4. If during the charging process of the batteries 13 or 4, the pressure in the battery 14 drops, the closing contact of its relay The 16 pressure de-energizes the electromagnet 34, and the opening contact supplies voltage to the electromagnet 35, providing the first charge of the battery 14. If, when the battery 14 is charged, the battery 13 is discharged during the charging of the battery 5, the pressure relay 15 turns on the electric omagnit 34 (and hence the valve 17). The latter leads to switching of the fluid flow to the battery 13, since the pressure in it is lower than that in the battery 4. During the next charging of the battery 5, the closing contact of its pressure switch 6 together with the disconnecting contact of the relay 16 is connected in series with the electromagnet 35. the closing contact of the pressure switch 16 to the electromagnet 34 circuit also provides the primary charge of the battery 14 as compared to the battery 13. Similarly, an electrical circuit can be made including a battery s. Claims of the Invention A hydraulic actuator comprising a pump inlet by pressure hydraulic with a check valve with a pneumo-hydraulic battery and, through an electrically controlled distributor, with an actuator, a pressure switch connected to the hydraulic cavity of the battery and electrically connected to the electromagnet of the safety valve, in order to extend the functionality by ensuring the work of several executive bodies at various pressures and given sequence battery charging, the hydraulic actuator contains additional pressure hydraulic lines according to the number of actuators, each of which has a pneumohydraulic accumulator and a pressure relay installed, the accumulators communicating with the pump each through a series-installed electrically controlled distributor and non-return valve, the output of the first accumulator communicating with the outputs of the next two electrically controlled distributors, and an additional electric control is installed between the pump and the check valve of the first battery emy distributor, wherein the distributor circuit to the electromagnet of each battery included in series break contact pressure of its relays and switching contacts of relays other pressure accumulators 32. J and the disconnecting contacts of the pressure switch of all batteries are connected in parallel in the electromagnet circuit of the safety valve. Sources of information taken into account during the examination 1. Bogdanovich L. B. Volumetric hydraulic actuators. Kiev. “Technique, 1971, p. 166, ris 108 37 Srig. 2