The constant pressure type hydraulic distance-regulating device electric control system
Technical field
The present invention relates to the electric control system of mill hydraulic distance-regulating device, relate in particular to a kind of constant pressure type hydraulic distance-regulating device electric control system.
Background technology
Mill is a rubber, one of basic equipment that the processing of plastic industry goods is the most frequently used, the roll-setting gear of mill is the spacing that is used for adjusting mill two rollers, make mill under different roller spacings, carry out work, and form the safety guard of mill jointly with safety device, prevent to cause roller because of the roller overload, frame, the damage of key components and parts such as bearing, because what original mill roll-setting gear adopted is motor, reductor, worm gear-endless screw, mechanical combining structure such as leading screw-nut, this structure is the problem of the following several respects of ubiquity in use: mill is roll adjustment fast during operation, the requirement that does not reach production technology; Because existence big gap in the coupling part of roll-setting gear and safety device can't be eliminated, cause the idle stroke that has when forward and back is changed in the roll adjustment process about 3mm, on dial, there is not demonstration, make display scale and actual roll spacing have very large deviation; Can't open fast in the anxious stopping time, not meet the CE safety standard, influence is to carrying out the sale of CE Standard User.
Summary of the invention
The purpose of this invention is to provide a kind of by hydraulic cylinder replacement machine driving roll-setting gear; and driving and control by hydraulic system, improve the roll spacing control accuracy of mill roll adjustment system and the constant pressure type hydraulic distance-regulating device electric control system of safeguard protection pressure precision.
The technical scheme that the present invention is adopted for achieving the above object is: a kind of constant pressure type hydraulic distance-regulating device electric control system, this system comprises Hydraulic Station, magnetic valve, pressure sensor, displacement transducer, controller PLC and analog-to-digital conversion module, described pressure sensor is installed in the rod chamber and rodless cavity of hydraulic cylinder in the Hydraulic Station, described displacement transducer is installed in the hydraulic cylinder in the Hydraulic Station, pressure signal that pressure sensor and displacement transducer will detect from Hydraulic Station and displacement signal are transported in the controller PLC, and controller PLC is transferred to magnetic valve by analog-to-digital conversion module with signal.
On the control cabinet of Hydraulic Station touch-screen is installed.
Constant pressure type hydraulic distance-regulating device electric control system of the present invention; replace the machine driving roll-setting gear by hydraulic cylinder; and driving and control by hydraulic system; improve the roll spacing control accuracy and the safeguard protection pressure precision of mill roll adjustment system; simultaneously; by maintenance hydraulic cylinder constant pressure and by the feedback signal of hydraulic system according to displacement transducer and pressure sensor; realize the automatic control of roll spacing; improve the functional reliability of mill; assurance work continuity; raise the efficiency and product quality; reduce operator's labour intensity; satisfy of the every requirement of European CE safety standard to mill roll adjustment system; by keeping the constant pressure of hydraulic cylinder inner chamber; realize the steady operation process; hydraulic cylinder is realized the adjustment of roller spacing; use displacement transducer to carry out the detection of roll spacing; the positioning accuracy of hydraulic cylinder rod can reach ± 0.2mm in; for guaranteeing accuracy of detection; displacement detecting and hydraulic cylinder rod connect together; accurately detect roller real load in the course of the work by pressure sensor; realize the accurate control of safeguard protection, cancellation machine security sheet is because the cancellation of machine security sheet; avoided the work of heavy replacing safety disc; guaranteed the work continuity of mill,, made the adjusting range of roll adjustment speed bigger by multichannel control; can realize opening fast of roll spacing, satisfy the requirement of CE safety standard.
Description of drawings
The invention will be further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is the flow chart of constant pressure type hydraulic distance-regulating device electric control system of the present invention.
Fig. 2 is a constant pressure type hydraulic distance-regulating device electric control system solenoid control schematic diagram of the present invention.
Fig. 3 is constant pressure type hydraulic distance-regulating device electric control system sensor signal feedback module figure of the present invention.
Fig. 4 is constant pressure type hydraulic distance-regulating device electric control system controller PLC analog input module figure of the present invention.
The specific embodiment
As Fig. 1; Fig. 2; Fig. 3 and shown in Figure 4; constant pressure type hydraulic distance-regulating device electric control system of the present invention; comprise Hydraulic Station; magnetic valve; pressure sensor; displacement transducer; controller PLC and analog-to-digital conversion module; pressure sensor is installed in the rod chamber and rodless cavity of hydraulic cylinder in the Hydraulic Station; displacement transducer is installed in the hydraulic cylinder in the Hydraulic Station; in pressure feedback amount that pressure sensor detects and the displacement signal input controller PLC by the displacement transducer detection; controller PLC controls flow and pressure; give magnetic valve by logical calculated output control signal; the action of control magnetic valve; its displacement and pressure are remained in mixing process in the scope of error operation; controller PLC control flow is: in the feedback quantity access controller PLC of pressure sensor and displacement transducer; transfer analog signal to data signal by analog-to-digital conversion module; in controller PLC, calculate; action by the control magnetic valve; make roller to target roll apart from fast moving; change at a slow speed behind the certain distance in the distance target roll and to advance; and after advancing to certain position; switching solenoid valve is oil-filled to the hydraulic cylinder rod chamber; reach setup pressure value and make hydraulic cylinder advance to target roll in allowed band; afterwards hydraulic cylinder two chambeies alternately are forced into rated pressure and maintenance; just can carry out normal millman afterwards does; hydraulic cylinder falls to press in the course of work; opening controlling valve carries out pressurising; skew before and after roller takes place; exceed roll spacing and set allowed band; repeat said process and rebulid pressure; whole process is by displacement signal; signal feedback such as pressure signal and control program are finished automatically; when the roller load increases; when surpassing the safeguard protection setting value; provide signal by pressure sensor; pass through control system; Hydraulic Station; hydraulic cylinder draws back roll gap fast and unloads; prevent device damage; after load reduces; roll spacing returns to the home position automatically; whole process is safe and reliable; when device looses power, also can open roller fast by accumulator.