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 mm

The 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.

 

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