The synchronization of movement of hydraulic cylinders
(57) Abstract:The invention relates to mechanical engineering and can be used when designing two-cylinder or four-cylinder high-speed hydraulic presses with Bolotnikova distributors. The technical result - improving the accuracy and reliability of the sync cylinder movements. In the synchronization system containing a throttling valve, a stepper motor, a control unit, a pulse displacement sensors, inputs of the stepping motor control unit from the corresponding displacement sensor. Moreover, the shaft of the stepper motor associated with the valve throttling valve movable slotted connection, and the shaft of the first stepping motor associated with the valve screw transmission. The synchronization system can be used in cutting machines for non-metallic materials and will allow for increasing the accuracy to improve the quality of harvested products, tool life and cutting boards. 1 Il. The invention relates to mechanical engineering and can be used when designing two-cylinder or four-cylinder high-speed hydraulic presses with Zolot press for cutting parts bottom shoes, created on the basis of the press PVG-18-2-On, with the number of moves to 60 per minute containing a throttling valve, a valve through which the transmission mechanism is connected with the stepper motor, the pulse displacement sensors and the control unit stepper motor, shown when testing the warp beam of 0.3 mm at an acceptable value for such presses 0,8 mmThe disadvantage of this system is the presence of an additional link synchronization batcher reciprocating motion, the complexity and the complexity of its manufacture, as well as the complexity of the connection shaft of the stepper motor with the valve, which reduces the accuracy and reliability of synchronization.The invention solves the problem of increasing the accuracy and reliability of the sync cylinder movements by eliminating invalid skew caused by the compressibility of the fluid in the branches of the dispenser, and also simplifies the control system by eliminating the need for additional devices to provide reverse operation of the stepper motor.This is achieved by the fact that the synchronization of the movement of the hydraulic cylinder containing a pump, connected through a throttling raspredelenie and electrically with a control unit, two pulse displacement sensor, the additional stepper motor, electrically connected with the second control unit, each of the pulse displacement sensors connected to the input of one of the control units, the first shaft of the stepper motor is connected to the throttling valve of the distributor screw gear and the second shaft of the stepper motor is connected to the throttling valve of the distributor slotted movable connection.The invention is illustrated by the drawing, which shows a schematic diagram of the press and the synchronization of the movement of hydraulic cylinders.The synchronization system consists of a throttling valve 12, the valve which on the one hand through the mechanism of the screw - nut 6 is connected to the shaft of the stepper motor (SM) 10, and on the other hand splined connection 7 is connected with the shaft of the stepper motor 11. The edges of the frame 3 with the pulse displacement sensors 4 and 5, the input pulses when moving beam control units 8 and 9, the corresponding stepper motor 10 and 11. The control units SM have direct and reverse inputs and provide the direction of rotation of the shaft in zavisimostyam.When working stroke, the valve 13 is switched to the left position. The liquid from the tank 15 by the pump 14 through the distributor 13 and the throttling valve 12 is supplied to the rod end of the cylinders 2. Traverse 1 does work its way down.If you are bespreken movement of the bar, then the number of pulses received from the sensors 4 and 5 on the control units 8 and 9 each SM, the same. Respectively will be equal and the angles of rotation of the shafts of the stepping motors 10 and 11, and therefore, the spool valve 12 will remain in a neutral position, flowing into the cylinders 2 is equal to the number of the working fluid.In the case of the warp beam 1 relative to the frame of the press 3, for example, rotating clockwise from the sensor 5 to the control unit 9 SM 11 receives a greater number of pulses than the control unit 8 SM 10. Accordingly, the shaft SM 11 rotates through a greater angle than the shaft SM 10. The direction of rotation of the stepper motor and the direction of the thread in a couple of screw - nut 6 are selected such that in this case, there will be displacement of the spool relative to the neutral position to the right. The amount of displacement is proportional to the warp beam 1. Therefore, the flow of the liquid in the op is the W beam. When the warp beam 1 in the other direction, the system works similarly.The proposed synchronization system can be used in cutting machines for non-metallic materials and will allow for increasing the accuracy to improve the quality of harvested products, tool life and cutting boards.Sources of information
1. Petrov N. In., Juices O. A., Semenikhin C. F., Tretyakov centuries the synchronization of movement of the cylinder of a hydraulic press for cutting parts bottom shoes // Leather-Shoe industry. - N 8 - 1988. - S. 63-65. The synchronization of movement of the hydraulic cylinder containing a pump, connected through a throttling valve with hydraulic cylinders, stepper motor, mechanically connected with the throttling valve and electrically connected with the control unit, two pulse displacement transducer, characterized in that it comes with a second stepper motor, electrically connected with the second control unit, each of the pulse displacement sensors connected to the input of one of the control units, the first shaft of the stepper motor is connected to the throttling valve of the distributor screw transmission, and VA is using.
FIELD: mechanical engineering.
SUBSTANCE: hydraulic press comprises table for setting die of the press tool, movable slide set in the guides of the housing, mechanism for moving the slide, and actuator for moving the slide. The actuator has two hydraulic cylinders. The mechanism for moving the slide is made of two shafts mounted in the horizontal openings of the slide for permitting rotation. The projecting ends of the shaft are provided with pinions. Each of the pinions moves over the pair of the gear racks. The racks are mounted vertically in the grooves of the housing for permitting adjusting movements with respect to each other with the use of screws. The actuator is additionally provided with two hydraulic cylinders and two arresters. Each of the hydraulic cylinders of the major motion is provided with unmovable rod which enters the dummy axial hole in the plunger to define an additional space for supplying the fluid. The plunger is provided with a pivot which projects out of the housing of the hydraulic cylinder. The pivot abuts against the slide. The rods of the hydraulic cylinders are provided with axial opening for supplying fluid. The spaces of the hydraulic cylinders of the major motion are connected with the additional tank mounted on the housing above the hydraulic cylinders.
EFFECT: enhanced quality of the press.
FIELD: mechanical engineering.
SUBSTANCE: invention relates to design and control systems of hydraulic presses. Proposed press contains stationary cross-rail and ram, two main cylinders and two lift cylinders, meter with two equal high-pressure metering cylinders pumping station and ram synchronous movement control system. Open two-position two-way cutoff spool is installed on common pipelines of main and lift cylinders. Control system includes three-position four-way reversible spool and is provided with two two-position three-way change-over spools. Meter is made with two equal low-pressure metering cylinders whose spaces are connected, in pairs with spaces of high-pressure metering cylinders, to outputs of two two-position three-way change-over spools closed for low-pressure metering cylinders and open for high-pressure metering cylinders. Said pairs of spaces of metering cylinders are connected, respectively, to outputs of two additional two-way three-position change-over spools closed for high-pressure cylinders and open for low-pressure cylinders. Spaces of high-pressure metering cylinders and spaces of low-pressure metering cylinders and spaces of low-pressure metering cylinders are connected with drain line in pairs by common pipelines with closed two-position two-way cutoff spools.
EFFECT: improved efficiency and reliability of press, reduced capital outlays and service expenditures.
3 cl, 1 dwg
FIELD: machine building.
SUBSTANCE: present invention pertains to machine building, particularly to devices for controlling the pressing process when making press joints in cylindrical objects for automating control of assembling processes. The device for controlling the pressing process when making press joints in cylindrical objects has a hydraulic press, joined together four updrafts with an elevating beam, four measuring transducers, each of which is in form of a strain sensor, an analogue-to-digital converter and an evaluator. The strain sensors are made on a measuring bridge circuit with provision for registering forces arising in the four updrafts. The outputs of the strain sensors are connected to the inputs of the analogue-to-digital converter, and the outputs of the latter are connected to inputs of the evaluator.
EFFECT: simplification of the design and widening of technological capabilities of the invented device.
FIELD: process engineering.
SUBSTANCE: invention relates to metal forming, particularly, to hydraulic presses. Proposed press comprises stationary and moving crossbars, two drive and two return cylinders, pump station and moving crossbar control system. System comprises two double booster dispenser and double reducer dispenser. Each of said devices incorporates inlet cylinder and two dispensing cylinders with plungers that make moving unit. Plunger units are rigidly interconnected. Press uses hydraulic valve system including four-way three-position reverse slide valve, two shutoff two-position slide valves, two pressure relays, six check valves, and extra four-way two-position reverse slide valve. Chamber of aforesaid dispensing cylinders are arranged along booster dispenser periphery and communicated via check valves with one of drive cylinders.
EFFECT: higher efficiency.
3 cl, 1 dwg
FIELD: machine building.
SUBSTANCE: hydraulic drive of a moving beam of a press comprises a power and a kicker hydraulic cylinder, a hydraulic distributor, a filling tank, a pressure hydraulic line connected to a pump-and accumulator-station, a drainage hydraulic line connected to the tank and a decompression unit for the fluid in the power cylinder. The decompression unit consists of a hydraulic motor and an adjustable pump with proportional electric control with their shafts being connected by a coupling. The inlet channel of the hydraulic motor is connected to the working cavity of the power hydraulic cylinder by a controlled valve. The outlet channel is connected to the tank. The inlet pump channel is connected to the filling tank. Its outlet channel is connected to the pressure hydraulic line by a check valve. Electric control unit of the pump is connected to the outlet of the controller included in the press control system. The controller inputs are connected to the outputs of the pressure sensor in the working cavity of the power hydraulic cylinder, those of the position sensor of the pump adjusting unit and of the angular velocity sensor for the rotation of hydraulic machines' shafts.
EFFECT: increased efficiency of a hydraulic drive due to keeping the potential energy accumulated for use in future as a result of elastic deformations of the fluid and steel structures of the press during the working stroke.
FIELD: machine building.
SUBSTANCE: hydraulic press comprises a moving beam and a fixed beam, two actuating cylinders and two return cylinders, a pump station and a system of distribution and directional control equipment. The said system comprises sixteen back pressure valves, fourteen two-way cut-off slides, a four-way three-position reverse slide, a four-way two-position slide, a main doser and an additional doser installed coaxially. Each doser is made with two identical high pressure dosing cylinders and two identical low pressure dosing cylinders. The cylinders' plungers form movable units rigidly fixed to each other and fitted by a bar to switch the four-way two-position slide. One input of the said slide is connected to the drain and the other - to the output of the four-way three-position slide. The high pressure dosing cylinders of the dosers are of periphery mounting and are connected to one of the power cylinders pairwise. The low pressure dosing cylinders of both dosers are connected to the pump station fluid tank separately via the back pressure valves.
EFFECT: expanded process functionality of a press and simplification of its control system.
2 cl, 1 dwg
FIELD: machine building.
SUBSTANCE: hydraulic drive of the press beam comprises the working and return hydraulic cylinders, hydraulic control valves of control, tank of filling up, pressure head and drain hydraulic lines, fluid decompression device in a working hydraulic cylinder. The decompression device consists of input and output hydraulic cylinders with the plate, installed as a separating element between their movable links. The working cavity of input hydraulic cylinder is connected by means of controlled valves with the working cavity of the working hydraulic cylinder and with drain hydraulic line. The working cavity of each of output hydraulic cylinders is connected to a pressure head hydraulic line by means of an individual check valve and with the fill tank by means of individual hydraulically controlled two-way valve. First of control cavities of the named valve ensuring the opening of the flow section of the valve, is connected to the pressure head hydraulic line. The second control cavity ensuring the closure of the valve flow section, is connected to the working cavity of the working actuator. The ratio of cumulative effective area of the gate of two-way valve from the side of the first control cavity and input cavity, connection with a working cavity of the relevant output hydraulic cylinder, to the effective area of the gate element from the side of the second control cavity is determined by the following formula.
EFFECT: increasing the efficiency of hydraulic cylinder.