CN112099441A - Pressure linear control method of four-way numerical control steel rail straightener - Google Patents
Pressure linear control method of four-way numerical control steel rail straightener Download PDFInfo
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- CN112099441A CN112099441A CN202010829923.3A CN202010829923A CN112099441A CN 112099441 A CN112099441 A CN 112099441A CN 202010829923 A CN202010829923 A CN 202010829923A CN 112099441 A CN112099441 A CN 112099441A
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- pressure
- proportional valve
- hydraulic proportional
- oil cylinder
- control system
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/414—Structure of the control system, e.g. common controller or multiprocessor systems, interface to servo, programmable interface controller
- G05B19/4147—Structure of the control system, e.g. common controller or multiprocessor systems, interface to servo, programmable interface controller characterised by using a programmable interface controller [PIC]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/34—Director, elements to supervisory
- G05B2219/34013—Servocontroller
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- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Straightening Metal Sheet-Like Bodies (AREA)
Abstract
The invention discloses a pressure linear control method of a four-way numerical control steel rail straightener, which comprises the steps of controlling a hydraulic proportional valve by utilizing an analog quantity output module of a PLC control system, controlling a straightening oil cylinder by the hydraulic proportional valve, and mounting a pressure sensor and a displacement sensor on the straightening oil cylinder; the pressure sensor and the displacement sensor collect the data of the straightening oil cylinder in real time and feed the data back to an analog quantity input module of the PLC control system; and through the calculation of the PLC control system, the voltage output of the analog quantity output module is linearly controlled, so that the voltage input signal of the hydraulic proportional valve is controlled, and the pressure of the hydraulic proportional valve is stably controlled through the feedback of real-time data. The invention can accurately control the pressure, and the variation of the pressure is reduced.
Description
Technical Field
The invention relates to a pressure control technology of a four-way numerical control steel rail straightener, in particular to a pressure linear control method of the four-way numerical control steel rail straightener.
Background
A four-way numerical control rail straightener belongs to a rail welding joint straightener and is special equipment for detecting and straightening the straightness of a long rail welding joint after aging. The straightener has the function of automatically measuring the welded joint of the steel rail, automatically measures the traveling surface and the guide surface of the welded joint through the laser measuring device, and judges whether the traveling surface and the guide surface meet the standard requirements. The straightening machine straightens the rail joint which does not meet the standard after detection, and has the functions of straightening in the horizontal direction and the vertical direction, wherein the maximum straightening acting force in the vertical direction is 2500KN, and the maximum straightening acting force in the horizontal direction is 1200 KN. And straightening the joint with the straightness not meeting the standard by the straightening machine according to the detection result by adopting a three-point pressing method. And adjusting a horizontal fulcrum and controlling the movement of a horizontal oil cylinder to straighten the bending of the steel rail joint in the horizontal direction, and adjusting a vertical fulcrum and controlling the movement of a vertical oil cylinder to straighten the bending of the steel rail joint in the vertical direction. In the process of straightening the working steel rail by applying force, the dynamic chart displayed on the operation display screen can be directly watched to know the straightening quality of the working steel rail under the current straightening and force applying state. The pressure and displacement feedback system collects data in real time through a pressure sensor arranged in the hydraulic system and a grating displacement sensor arranged on the straightening oil cylinder, and the data are transmitted to a display screen after being processed by a computer system.
The hydraulic straightening operation of the straightening machine is operated by two single-shaft bidirectional proportional handles to respectively control the vertical direction and the horizontal direction, each operation direction of the handles corresponds to the movement of a corresponding straightening oil cylinder, and the action of the oil cylinders is controlled by a hydraulic proportional valve. Because the operating handle has the interlocking function, the straightening operation in one direction can be carried out under any condition, when the operating handle is pulled to continue to push in any direction, the straightening operation starts to be carried out at the moment, and the corresponding straightening oil cylinder drives the straightening force application point to quickly approach the operation steel rail. When the force application fulcrum is contacted with the operation steel rail, the pressure of the hydraulic system is instantly increased, the movement speed of the straightening oil cylinder is immediately switched to slow movement, and the working pressure of the hydraulic system is correspondingly increased along with the forward pushing of the operating handle until the acting force required by the bending deformation of the straightening operation steel rail is achieved. And (4) loosening the operating handle, and returning the straightening oil cylinder to the original position.
The existing four-way numerical control steel rail straightener adopts a hydraulic proportional valve to control output, and a single-shaft two-way proportional handle is used for voltage input of the proportional valve. Because the operating angle that the handle was stirred is only 30, can't accurate control in the control accuracy, the size of data also can't be controlled, and the pressure output on perpendicular and horizontal direction can't accurate stable control, and pressure data variation is too big, and the stability of pressure is too poor.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a pressure linear control method of a four-way numerical control steel rail straightener, which can accurately control pressure and reduce the pressure variation.
In order to achieve the purpose, the invention adopts the following technical scheme:
a pressure linear control method of a four-way numerical control steel rail straightener comprises the following steps:
controlling a hydraulic proportional valve by using an analog quantity output module of a PLC control system, controlling a straightening oil cylinder by using the hydraulic proportional valve, and mounting a pressure sensor and a displacement sensor on the straightening oil cylinder;
the pressure sensor and the displacement sensor collect the data of the straightening oil cylinder in real time and feed the data back to an analog quantity input module of the PLC control system;
and through the calculation of the PLC control system, the voltage output of the analog quantity output module is linearly controlled, so that the voltage input signal of the hydraulic proportional valve is controlled, and the pressure of the hydraulic proportional valve is stably controlled through the feedback of real-time data.
Preferably, the calculation of the PLC control system includes specifically giving an equivalent increase in the analog voltage for an equivalent time to achieve linear control.
The pressure linear control method of the four-way numerical control steel rail straightener can reduce the working time, control the stable pressure change of the proportional valve, enable operators to react in time, prevent the steel rail from being broken due to overlarge stress, and greatly improve the safety of the straightener equipment.
Drawings
FIG. 1 is a control schematic of the linear control method of pressure of the present invention;
FIG. 2 is a schematic diagram of the linear relationship between the analog voltage input and the proportional valve voltage output in the pressure linear control method of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Referring to fig. 1 to 2, a pressure linear control method of a four-way numerically controlled rail straightener provided by the present invention includes:
an analog quantity output module 2 of the PLC control system 1 is used for controlling a hydraulic proportional valve 3, then the hydraulic proportional valve 3 is used for controlling a straightening oil cylinder 4, and a pressure sensor 5 and a displacement sensor 6 are arranged on the straightening oil cylinder 4.
The pressure sensor 5 and the displacement sensor 6 collect pressure and position data of the straightening oil cylinder 4 in real time and feed the data back to the analog input module 7 of the PLC control system 1.
The voltage output of the analog quantity output module 2 is linearly controlled through the calculation of the PLC control system 1, so that the voltage input signal of the hydraulic proportional valve 3 is controlled, and the pressure of the hydraulic proportional valve 3 is stably controlled through the feedback of real-time data. The pressure value can be accurate to 1KN, and the change rate of the pressure value can be adjusted at will.
The PLC control system 1 calculates a voltage output of a fixed analog value per unit time. In actual use, each operator has different use senses, some operators need to have higher speed, and some operators need to have lower speed, so the PLC control system 1 can be adjusted according to actual conditions.
The calculation of the PLC control system specifically includes giving an equivalent increase in the analog voltage for an equivalent amount of time to achieve linear control. For example, the analog quantity voltage of 0.1V is increased in 100 milliseconds, the time can be increased or decreased, and the analog quantity of 0.1V can be increased or decreased.
Under the condition that a four-way numerical control steel rail straightener is not changed, the pressure is stably controlled and accurately controlled, the voltage input of a hydraulic proportional valve 3 needs to be changed, and an analog output module 2 needs to be added to control the hydraulic proportional valve. The voltage output of the analog quantity output module 2 is controlled through the PLC control system 1, so that the voltage input signal of the hydraulic proportional valve 3 is accurately controlled, and the pressure of the hydraulic proportional valve 3 is stably controlled through the real-time feedback of data of the pressure sensor 5 and the displacement sensor 6.
In the control action, when the straightening oil cylinder 4 rapidly advances, the output voltage of the analog quantity output module 2 reaches the maximum voltage, and when the straightening oil cylinder 4 is determined to advance to 5 mm away from the surface of the steel rail through data of the displacement sensor 6 (a grating ruler), the output voltage of the analog quantity output module 2 is changed to be 5V voltage, so that the instantaneous pressure change of high pressure switching by pressure action can be controlled after the straightening oil cylinder 4 is in contact with the surface of the steel rail. Then, the PLC control system 1 controls the analog quantity output module 2 to linearly change the analog quantity voltage, and the analog quantity voltage is increased by 0.1V every 50 milliseconds, so that the pressure change quantity and the change speed of the hydraulic proportional valve 3 are stably controlled. Also, by setting the maximum pressure, the maximum output of the analog quantity voltage can be limited. The variation and the variation speed of the analog quantity voltage can be changed by the control of the PLC control system 1, so that the analog quantity voltage can be conveniently adjusted in real time according to the requirements of an operator.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (2)
1. A pressure linear control method of a four-way numerical control steel rail straightener is characterized by comprising the following steps:
controlling a hydraulic proportional valve by using an analog quantity output module of a PLC control system, controlling a straightening oil cylinder by using the hydraulic proportional valve, and mounting a pressure sensor and a displacement sensor on the straightening oil cylinder;
the pressure sensor and the displacement sensor collect the data of the straightening oil cylinder in real time and feed the data back to an analog quantity input module of the PLC control system;
and through the calculation of the PLC control system, the voltage output of the analog quantity output module is linearly controlled, so that the voltage input signal of the hydraulic proportional valve is controlled, and the pressure of the hydraulic proportional valve is stably controlled through the feedback of real-time data.
2. The pressure linear control method as set forth in claim 1, wherein: the calculation of the PLC control system includes in particular giving an equal increase of the analog voltage in an equal amount of time, so as to achieve a linear control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010829923.3A CN112099441A (en) | 2020-08-18 | 2020-08-18 | Pressure linear control method of four-way numerical control steel rail straightener |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010829923.3A CN112099441A (en) | 2020-08-18 | 2020-08-18 | Pressure linear control method of four-way numerical control steel rail straightener |
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| CN112099441A true CN112099441A (en) | 2020-12-18 |
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| CN202010829923.3A Pending CN112099441A (en) | 2020-08-18 | 2020-08-18 | Pressure linear control method of four-way numerical control steel rail straightener |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113319152A (en) * | 2021-04-21 | 2021-08-31 | 邯郸钢铁集团有限责任公司 | Method for realizing intelligent pressure straightening of steel rail |
| CN114352598A (en) * | 2022-01-27 | 2022-04-15 | 广东皓耘科技有限公司 | Hydraulic cylinder proportional valve adjusting method and device, controller and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102151719A (en) * | 2011-01-31 | 2011-08-17 | 辽宁银捷机械装备制造有限公司 | High-accuracy straightening machine for tantalum-niobium alloy pipe |
| CN104117554A (en) * | 2014-06-30 | 2014-10-29 | 辽宁银捷装备科技股份有限公司 | Automatic control system and method for high-precision straightening machine |
| CN104816275A (en) * | 2015-03-26 | 2015-08-05 | 山东钢铁股份有限公司 | Main hydraulic cylinder seal online replacement method of large pressure straightener |
| CN108223898A (en) * | 2017-12-28 | 2018-06-29 | 南京钢铁股份有限公司 | Current mode electro-hydraulic proportional valve current feedback system |
-
2020
- 2020-08-18 CN CN202010829923.3A patent/CN112099441A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102151719A (en) * | 2011-01-31 | 2011-08-17 | 辽宁银捷机械装备制造有限公司 | High-accuracy straightening machine for tantalum-niobium alloy pipe |
| CN104117554A (en) * | 2014-06-30 | 2014-10-29 | 辽宁银捷装备科技股份有限公司 | Automatic control system and method for high-precision straightening machine |
| CN104816275A (en) * | 2015-03-26 | 2015-08-05 | 山东钢铁股份有限公司 | Main hydraulic cylinder seal online replacement method of large pressure straightener |
| CN108223898A (en) * | 2017-12-28 | 2018-06-29 | 南京钢铁股份有限公司 | Current mode electro-hydraulic proportional valve current feedback system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113319152A (en) * | 2021-04-21 | 2021-08-31 | 邯郸钢铁集团有限责任公司 | Method for realizing intelligent pressure straightening of steel rail |
| CN113319152B (en) * | 2021-04-21 | 2022-10-28 | 邯郸钢铁集团有限责任公司 | Method for realizing intelligent pressure straightening of steel rail |
| CN114352598A (en) * | 2022-01-27 | 2022-04-15 | 广东皓耘科技有限公司 | Hydraulic cylinder proportional valve adjusting method and device, controller and storage medium |
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