Control system hydraulic pressure
(57) Abstract:The invention relates to mechanical engineering and can be used in control systems for hydraulic presses. The technical result is increased reliability, and simplified system management. Control system hydraulic pressure holds the valves of the power cylinders, the drive programmetically with the rack on the rod, the dispenser with the valve control from its stem in the hydroline connecting the valves of the power cylinders and the drive programmetically. In addition, the system contains safety and check valves, camshaft with Cams to control the valves of the power cylinders connected with a toothed rack drive of programmetically. Rod cavity of the dispenser is connected through a relief valve with actuator programmetically and through the check valve with the valve control of the dispenser, which made way for communication with both the cavity of the spout and valves of the power cylinders. 1 Il. The invention relates to mechanical engineering and can be used in control systems hidraulica control hydraulic pressure /Y. A. Chernikov. 1980, B. I. N 28), containing the valves of the power cylinders, the drive programmetically, the dispenser in the hydroline connecting the valves of the power cylinders to drive programmetically, two-position three-way valve connected to the pressure pipe and the rod cavity of the dispenser, triggered from the rising pressure in the pressure pipeline. Because two-position three-way valve can be switched before the piston of the power cylinder will make a full stroke, the control system has low reliability.Known control system hydraulic process (ed. mon N 1049264 (USSR). Control system hydraulic pressure. /Y. A. Chernikov, S. P. Kalashnikov. 1983, B. I. N 39/ containing the valves of the power cylinders, the drive programmetically with the rack on the rod, the dispenser with the valve control from its stem in the hydroline connecting the valves of the power cylinders and the drive programmetically, additional safety and check valves, distributed shaft with Cams to control the valves of the power cylinders associated with the timing of reconsidera has managed from the safety valve through the switch and the solenoid choke.The installation is controlled throttle and the presence of a special safety valve, switch and solenoid complicates the control system and does not exclude the fact that programmetically work before the piston of the power cylinder is moved to the desired position, i.e. no full control end of the power cylinder.Technical problem - increasing reliability and simplifying system management. The goal of the project is achieved that the control system hydraulic pressure containing valve power cylinders, the drive programmetically with the rack on the rod, the dispenser with the valve control from its stem in the hydroline connecting the valves of the power cylinders and the drive programmetically, safety and check valves, camshaft with Cams to control the valves of the power cylinders connected with a toothed rack drive of programmetically, rod cavity of the dispenser is connected through a relief valve with actuator programmetically and through the check valve with the valve control of the dispenser, which is ndrew.The drawing shows the proposed control system hydraulic pressure.The system contains the four-way valve 1 control dispenser 2. The dispenser has two working cavities and provided with a piston 3 and piston rod 4. On the control valve spool 1 is rigidly fixed to the rod 5 with sleeves 6 and 7 and springs 8 and 9. On the shaft 4 of the dispenser 2 fixed stop 10, through which the springs 8 and 9, the cups 6 and 7 can affect the rod 5. Rod cavity of the dispenser 2 are connected via an additional safety valve 11 and the valve 12 with the actuator 13 programmetically and through the check valve 14 a four-way valve 1 control dispenser 2.The system includes a power cylinders 15, 16 valves 17, 18. Drain hydroline valves 17 and 18 are connected with four-way valve 1 control dispenser 2. The actuator cylinder 13 programmetically has a piston 19 and the rack 20 on the shaft 21. The Cams 22 and 23 mounted on the distributor shaft 24 with the gear wheels 25 and 26, kinematically connected with the auxiliary shaft 27 with the gear wheels 28 and 29. Junction 24 and auxiliary shafts 27 are the coupling halves 30 and 31, alumafly 30 and 31 are mounted on the dowels or splines and can move along the shaft in the axial direction. Therefore, the Cam shaft 24 is rotated always in one direction. Power to the system is the pump 34. To ensure the system pressure is not higher than the set serves as a relief valve 35. Draining fluid from the actuator 13 programmetically and safety valve 35 is in the lifters 36.The control system operates as follows.When the pump 34 flows into the rod cavity of a cylinder 15. From his Rodless cylinders oral liquid is expelled through the valve 17, the four-way valve 1 in the dispenser 2. The piston 3 with the rod 4 rises. The check valve 14 is closed and the fluid from the rod end of the dosing device 2 via the relief valve 11 is supplied through the control valve 12 in the actuator cylinder 13 programmetically. In the extreme upper position of the piston 3 stop 10 through the spring 8, the Cup 6 and rod 5 switches the four-way valve 1. Fluid from the power cylinder 15 is supplied into the rod cavity of the metering device 2 through the control valve 17, the four-way valve 1 and valve 14. The stop 10 in the lowest position through a spring 9, the glass 7 and the rod 5 of the switch 2 via the relief valve 11 and the valve 12 is supplied to the drive programmetically. The camshaft 24, always rotating in one direction, the Cam 22 switches the valve 17. Fluid from the pump 34 is served in Rodless cylinders cylinder chamber 15. From the rod end of the fluid through the control valve 17, the four-way valve 1 comes under the piston 3 of the dispenser 2, and so on.Thus, in the actuator 13 programmetically receives fluid from the rod end of the dispenser 2, and most of the fluid that is displaced from the power cylinders 15 and 16, merges the lifters 36. The presence of spring-loaded tumblers 6 and 7, the movable rod 5, for example, carving, allows to set the desired stroke of the piston 3 of the dispenser 2. It is equal to the distance between the cups 6 and 7.The presence of four-way valve control of the dispenser and connect the rod end of the dispenser through the pressure relief valve with actuator programmetically and through check valve with four-way valve control dispenser improves system reliability and simplifies it at small sizes drive programmetically. The ratio of displacements rod and Rodless cylinders (piston) cavities in the dispenser is modified by replacing the stock compactest systems provide the necessary angle of rotation of the camshaft. Control system hydraulic pressure, containing the valves of the power cylinders, the drive programmetically with the rack on the rod, the dispenser with the valve control from its stem in the hydroline connecting the valves of the power cylinders and the drive programmetically, safety and check valves, camshaft with Cams to control the valves of the power cylinders connected with a toothed rack drive of programmetically, characterized in that the rod cavity of the dispenser is connected through a relief valve with actuator programmetically and through the check valve with the valve control of the dispenser, which made way for communication with both the cavity of the spout and valves of the power cylinders.
FIELD: press equipment; press hydraulic drives.
SUBSTANCE: the invention is dealt with the field of press equipment, in particular, with the press hydraulic drives intended predominantly for compaction of fibrous and powdery materials. The drive contains the hydraulic cylinders of a pressing system and an ejector, an auxiliary hydraulic valve of control and a safety valve. The cavities of a coupling rod and a piston of each hydraulic cylinder are connected by hydraulic lines accordingly to the first and the second executive channels of the corresponding main hydraulic valves of control. The outlet channel of the hydraulic valve of control over the hydraulic cylinder of pressing is linked to the drainage. In the first working position the inlet channel of each main hydraulic valve of control is linked with the first executive channel. The second executive channel is linked with the outlet channel. The outlet channel of the main hydraulic valve of control of the hydraulic cylinder of the ejector trough the check valve is linked with the piston cavity of the hydraulic cylinder of pressing. In the neutral position of each main hydraulic valve of control all its channels are shut. In the second working position of each main hydraulic valve of control its inlet channel is linked with the second executive channel and the first executive channel and the outlet channel are shut. The drive is supplied with an additional auxiliary hydraulic valve of control and a safety valve. The first channel of each auxiliary hydraulic valve of control is linked with a coupling rod cavity. The second channel is linked with a piston cavity of the corresponding hydraulic cylinder, and the third channel - with the drain. In the neutral position of the auxiliary hydraulic valve of control of the hydraulic cylinder of the ejector all channels are shut. In the first working position the first channel is shut and the second channel is linked with the third channel. In the second working position the first channel is linked with the second channel and the third channel is shut. Each of safety valves is connected by its inlet channel to a hydraulic line linked with the coupling rod cavity of the corresponding hydraulic cylinder. The safety valve of the hydraulic cylinder of the ejector is supplied with an electrical control. In result the invention ensures increased efficiency of the press drive operation.
EFFECT: the invention ensures increased efficiency of the press drive operation.
5 cl, 3 dwg
FIELD: mechanical engineering.
SUBSTANCE: fluid-pressure system comprises actuating hydraulic cylinders with the control fluid-operated devices, hydraulic distributors connected with programmed device, and hydraulic station . The hydraulic distributors are mounted on the top plate of the press bed. The control hydraulic device for each actuating hydraulic cylinder is mounted in the unit made of the lid of its stroke-less space and is connected with the appropriate hydraulic distributor. The system is provided with the ring collector mounted on the top plate of the bed and connected to the hydraulic distributors and hydraulic station. The hydraulic distributors are mounted radially and equidistantly from the axis of rotation of the central shaft of the press. The programmed device is mounted at the top end of the central shaft and is made of a cylinder. The outer side of the cylinder is provided with linings for permitting adjustment. The ring collector is made of pipes shaped into rings and mounted one inside the other coaxially to the central shaft. The number of pipes is determined by the number of stages of the fluid pressure in the hydraulic system.
EFFECT: simplified structure and enhanced reliability.
3 cl, 2 dwg
FIELD: machine engineering, namely systems for controlling power pneumo-hydraulic drives of machines.
SUBSTANCE: system includes compressed air source; compressed air distributor connected to said air source by its inlet; apparatus for controlling operation cycle; controlling pneumo-hydraulic distributors connected to compressed air distributor. Outlets of compressed air distributor are communicated through pipelines with rod and piston cavities of working and power cylinders of drive. Compressed air distributor is in the form of three three-way two-position pneumatic distributors. Outlet of each pneumatic is communicated respectively with rod cavity of working cylinder, with rod cavity of power cylinder and with piston cavity of power cylinder. Apparatus for controlling operation cycle is in the form of pressure relay with pneumatic outlet, inlet opening and outlet opening. The last is communicated with control cavities of three-way two-position pneumatic distributors whose outlet are connected with rod - and piston cavities of power cylinder. Inlet opening of pressure relay is communicated with rod cavity of power cylinder.
EFFECT: improved flexibility and reliability of control system.
3 cl, 1 dwg
FIELD: technological processes; engines and pumps.
SUBSTANCE: method includes serial stages of movable and fixed press elements closure at low pressure, pressing at high pressure and opening of specified press elements, with additional supply of compressed air into power cylinder stem cavity. System of pneumohydraulic drive control is made in the form of three bistable pneumatic valves, outlets of which are connected to stem and piston cavities of working and power cylinders of drive. At that the main pneumatic valve connected by its outlet to stem cavity of working cylinder is connected by the same outlet to stem cavity of power cylinder via reduction gear and check valve.
EFFECT: higher efficiency and elimination of foam generation and losses of hydraulic liquid.
7 cl, 1 dwg, 2 ex
FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy and may be used in hydraulic press control devices. Proposed drive comprises working and back-pressure hydraulic cylinders, controlled pressure and drain valves, working cylinder fill valves, fill tank, and bypass valve with control chamber. Said chamber is composed of structural parts and cylindrical guide part of shutoff element on the side opposite valve seat. Bypass valve inlet channel, on seat side, communicates with back-pressure cylinder working chambers. Outlet channel on shutoff element side communicates with pressure line. Bypass valve control chamber communicates with outlet channel of logical OR element. Bypass valve shutoff element guide part diameter is not smaller than OD of contact surface of shutoff element and seat shutoff edges.
EFFECT: ruled out spontaneous beam displacement at excess pressure drop in pressure line.
3 cl, 1 dwg
FIELD: machine building.
SUBSTANCE: metal-forming machine is actuated by at least two generators (1, 2) of pressure by means of fluid medium under pressure similar to water, while pressure generators are actuated by pumps (31-33) with controlled efficiency by means of another fluid medium under pressure, for example liquid for hydraulic systems.
EFFECT: simplifying design, reducing energy consumption.
21 cl, 4 dwg
SUBSTANCE: mix of boron carbine, aluminium powder and pelletised aluminium powder is placed in steel shell. Composition preventing bonding of said shell of powder mix is applied on shell inner surface. Powder mix is compacted, closed by shell, heated and rolled. Power mix rolling is said shell is conducted at 590-610°C with powder mix reduction of at least 60% and that of shell not over 20%. Compacted blank is removed from said shell after rolling. It is cut to parts to make sandwiched stack for hot rolling. Parts of said sandwiched compacted blank are arranged between sheets of aluminium alloys and layers or pure aluminium. Stack hot rolling is conducted at 400-430°C and reduction of at least 50%.
EFFECT: efficient neutron protection.
6 cl, 1 tbl, 2 dwg
FIELD: machine building.
SUBSTANCE: hydraulic drive of the movable press beam comprises working and return hydraulic cylinders, hydraulic control valves of control, tank of filling up, pressure head and drain hydraulic lines, hydropneumatic accumulator. The fluid cavity of the accumulator is connected to low pressure hydraulic line and with the output channel of a three-line two-way hydraulic control valve. The input duct of the latter is connected to the hydraulic line of high-pressure fluid input, and executive channel and control spring cavity are connected to the working cavity of working hydraulic cylinder. In the control cavity of the hydraulic control valve opposite to spring cavity and connected with drain hydraulic line, the bellows tank with liquid filler is installed. Its internal space is connected with the internal space of the bellows tank installed in the cavity of die tooling. The named tank contacts with the back of the thruster, the liner 29 of which falls outside the working surface of die tooling for contact with the body of piercer or preform.
EFFECT: level and period of action of dynamic loads occurring at sudden disappearing of working load are decreased, and the possibility of crossbar speed regulation is ensured.
6 cl, 2 dwg
FIELD: machine building.
SUBSTANCE: invention relates to hydraulic devices for the actuation of processing machines, in particular, at metal treatment under pressure. A hydraulic actuator comprises at least two alternately actuated pressure generators with each of them consisting of a driving oil cylinder and a driven emulsion cylinder with a common plunger. The oil hydraulic system is fitted by high-pressure pumps of regulated capacity and hydraulic valves of pressure generator control. The emulsion hydraulic system is fitted by a make-up tank, check valves and a pressure pipeline feeding the hydraulic system of a processing machine. The oil hydraulic system is fitted by an accumulator with a charging pump and a safety valve adjusted for the pressure corresponding to 85-95% of the pressure in the pressure pipeline. The oil hydraulic system is equipped with a three-position hydraulic valve which provides for alternating connection of the accumulator to the driving cylinders of the pressure generators prior to the start of pumping the emulsion into the pressure pipeline.
EFFECT: specified speed of processing machine's working members is maintained, the machine vibrations at switching of pressure generators are prevented, thus quality of the produced items is improved.
2 cl, 1 dwg
FIELD: machine building.
SUBSTANCE: hydraulic press comprises a stand, a power hydraulic cylinder with a piston and a stem, with piston and stem cavities, which are by channels connected to hydraulic lines of a control circuit. The hydraulic cylinder comprises a pressing plunger with the possibility of its extension via a hole in one end of the hydraulic cylinder, the second end of which is fixed in the stand, and in this end the piston stem is fixed. The channel of the stem cavity is made inside the stem, and the channel of the piston cavity - inside the stem and the piston. In the best version the hydraulic press is made in the form of a vertical press of double-sided action, with arrangement of upper and lower hydraulic cylinders.
EFFECT: increased efficiency of a hydraulic press, reduced necessary amount of working liquid in the form of oil, improvement of its weight and dimension parameters.