Hydraulic electrohydraulic ratio control system and method for prebending machine

An electro-hydraulic proportional and control system technology, applied in fluid pressure actuation system components, mechanical equipment, fluid pressure actuation devices, etc. Effect

Inactive Publication Date: 2009-06-24

TIANSHUI METALFORMING MACHINE TOOL GROUP

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Problems solved by technology

[0004] The purpose of the present invention is to provide a pre-bending machine hydraulic electro-hydraulic proportional c...

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Method used

In the embodiment of the present invention, the hydraulic system adopts the electro-hydraulic proportional control system of German Rexroth Company, which controls the synchronous operation of the slider of the pre-bending machine, the final position control of the slider, and the proportional pressure control of the hydraulic system. For the special requirements of the hydraulic system, the Swiss CYBLECE company DNC-60PS numerical control system is selected for control. DNC-60PS CNC system is compact in hardware design and small in size, and the man-machine interface and control system are highly integrated. Provide users with encoder, grating pulse input signal interface; I/O switch interface; analog input and output interface. One DNC-60PS numerical control system can simultaneously control two sets of closed-loop large-flow electro-hydraulic proportional directional valve groups and one set of open-loop electro-hydraulic proportional pressure...

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Abstract

The invention discloses a hydraulic pressure electric liquid proportional control system for a prebending machine, aiming at solving the problem of high price of a numerical control system of the existing steel plate prebending machine. The proportional control system comprises a hydraulic proportional valve closed-cycle control system and a slide block external ring closed-cycle control system, wherein, the hydraulic proportional valve closed-cycle control system comprises a hydraulic proportional amplifier, an electric liquid proportional direction valve with high flow rate and a valve case inner loop feedback part, and the numerical control system is electrically connected with a proportional valve amplifier by voltage control signals; the proportional valve amplifier is electrically connected with the electric liquid proportional direction valve with high flow rate by high driving currents; the electric liquid proportional direction valve with high flow rate is connected with a hydraulic system of a main oil cylinder of the prebending machine; and the main oil cylinder of the prebending machine is connected with the slide block of the prebending machine by a mechanical system. By adjusting DNC-60PS control parameters, the proportional control system guarantees the start, the high-speed rise, the low-speed rise, the positioning stop, the pressure maintenance, the pressure relief and the fast return of the slide block of the prebending machine, and has stable running of the entire process, high response speed and high positioning accuracy.

Application Domain

Fluid-pressure actuator components

Technology Topic

Inner loopLow speed +13

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Examples

Experimental program(1)

Example Embodiment

[0020] The hydraulic electro-hydraulic proportional control system of the pre-bending machine of the present invention includes a hydraulic proportional valve closed-loop control system and a slider outer-loop closed-loop control system. The hydraulic proportional valve closed-loop control system consists of a hydraulic proportional amplifier 203, a large flow electro-hydraulic proportional directional valve 205 and a spool. The inner loop feedback 208 is composed. The slider outer loop closed-loop control system is composed of the numerical control system 201, the pre-bending machine slide 207, and the outer loop speed position feedback 209 of the grating ruler. The numerical control system 201 is electrically connected to the proportional valve amplifier 203 through the voltage control signal 202. Connection; the proportional valve amplifier 203 is electrically connected to the large-flow electro-hydraulic proportional directional valve 205 by driving a large current 204; the large-flow electro-hydraulic proportional directional valve 205 is connected to the hydraulic system of the pre-bending machine main cylinder 206; the pre-bending machine main cylinder 206 The mechanical system is connected with the slider 207 of the pre-bending machine to finally form an electro-hydraulic integrated slider motion control system.

[0021] The pre-bending machine unit of this embodiment is composed of two oppositely arranged pre-bending machine hosts. Each pre-bending machine is driven by two oil cylinders, a set of hydraulic electro-hydraulic proportional system, and a set of DNC-60PS numerical control system controls a set of hydraulic pressure. Electro-hydraulic proportional drive system, a set of electro-hydraulic proportional drive system respectively controls two sets of hydraulic cylinders, and the two sets of hydraulic cylinders synchronously drive the pre-bending machine slider to realize the start of the pre-bending machine slider, rapid rise, slow rise, positioning stop, and protection Pressure, pressure relief, and quick return to complete the cylinder movement cycle. The entire running process of the slider is stable, fast response, and high positioning accuracy.

[0022] The numerical control system 201 includes a left machine numerical control system 101 and a right machine numerical control system 108. The left machine numerical control system 101 is connected to the left electro-hydraulic proportional control system 102, the machine numerical control system 108 is connected to the right electro-hydraulic proportional control system 109, and the left electro-hydraulic proportional control system is The system 102 is respectively connected to the left cylinder 103 of the left engine and the right cylinder 104 of the left engine. The left cylinder 103 of the left engine and the right cylinder 104 of the left engine are respectively connected to the slider 105 of the left pre-bending machine; the left cylinder 110 of the right engine and the right cylinder 111 of the right engine. They are respectively connected with the slider 112 of the right machine pre-bending machine.

[0023] The hydraulic electro-hydraulic proportional control system of the pre-bending machine and the control method thereof of the present invention are suitable for including a hydraulic proportional valve closed-loop control system and a slider outer-loop closed-loop control system, and is characterized in that it includes the following steps:

[0024] Step 1: Input the slider speed value and position value to be controlled on the man-machine interface of the numerical control system 201, and the numerical control system 201 sends out the control voltage command signal 202 to control the hydraulic proportional amplifier 203;

[0025] Step 2. The hydraulic proportional amplifier 203 amplifies the voltage command signal of the numerical control system into a current drive signal 204, and directly drives the large-flow electro-hydraulic proportional directional valve 205; the large-flow electro-hydraulic proportional directional valve 205 and the hydraulic proportional amplifier 203 have a spool between them The inner loop feedback 208 performs spool position feedback to realize the precise control of the flow of the hydraulic system by the large-flow electro-hydraulic proportional directional valve 205;

[0026] Step 3: The high-flow electro-hydraulic proportional directional valve 205 controls the flow of the hydraulic system according to the current drive signal current, and the large-flow electro-hydraulic proportional directional valve 205 controls the running speed of the main cylinder 206 of the pre-bending machine according to the flow;

[0027] Step 4: The pre-bending machine main cylinder 206 directly drives the pre-bending machine slider 207 to run, completing a slider work cycle;

[0028] Step 5: Compare and adjust the command given by the numerical control system 201 with the speed position feedback 209 of the outer ring of the grating, and control the precision of the slide block of the pre-bending machine.

[0029] In the embodiment of the present invention, the hydraulic system adopts the electro-hydraulic proportional control system of German Rexroth Company, which controls the synchronous operation of the slide block of the pre-bending machine, the final position of the slide block, and the proportional pressure control of the hydraulic system. For the special requirements of the hydraulic system, the DNC-60PS CNC system from CYBLECE of Switzerland is used for control. The DNC-60PS CNC system has a compact structure and small size in terms of hardware design, and the human-machine interface and the control system are highly integrated. Provide users with encoder, grating pulse input signal interface; I/O switch interface; analog input and output interface. One DNC-60PS numerical control system can simultaneously control two groups of closed-loop high-flow electro-hydraulic proportional directional valve groups and one group of open-loop electro-hydraulic proportional pressure valve groups. In terms of software design, the structured control parameters of DNC-60PS CNC system are open to users. Through the adjustment of DNC-60PS control parameters, the slider of the pre-bending machine can be started, fast rising, slow rising, positioning stop, pressure maintaining, and unloading. Press and return quickly, the whole process runs smoothly, the response speed is fast, and the positioning accuracy is high.

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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Hydraulic electrohydraulic ratio control system and method for prebending machine

An electro-hydraulic proportional and control system technology, applied in fluid pressure actuation system components, mechanical equipment, fluid pressure actuation devices, etc. Effect

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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