CN104675782A - Pre-stressed intelligent tension-pull electro-hydraulic servo equipment and control method thereof - Google Patents
Pre-stressed intelligent tension-pull electro-hydraulic servo equipment and control method thereof Download PDFInfo
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- CN104675782A CN104675782A CN201510080158.9A CN201510080158A CN104675782A CN 104675782 A CN104675782 A CN 104675782A CN 201510080158 A CN201510080158 A CN 201510080158A CN 104675782 A CN104675782 A CN 104675782A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/02—Servomotor systems with programme control derived from a store or timing device; Control devices therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
- F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/22—Synchronisation of the movement of two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F15B13/08—Assemblies of units, each for the control of a single servomotor only
- F15B13/0803—Modular units
- F15B13/0807—Manifolds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
- F15B15/283—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using a cable wrapped on a drum and attached to the piston
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20507—Type of prime mover
- F15B2211/20515—Electric motor
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses pre-stressed intelligent tension-pull electro-hydraulic servo equipment which comprises a computer (1) and a plurality of tension-pull devices, wherein each tension-pull device comprises an oil supply and return device, a bidirectional digital valve assembly communicated with the oil supply and return device, a jack (2) communicated with the oil supply and return device and the bidirectional digital valve assembly, a control panel (3) electrically connected with the jack (2), the bidirectional digital valve assembly and the oil supply and return device; wherein the control panel (3) of each tension equipment is connected with the computer (1) and is used for controlling a tension test process and analyzing a result. The invention further discloses a control method for the pre-stressed intelligent tension-pull electro-hydraulic servo equipment. The equipment and the method are simple in structure, high in loading precision, large in force value and high in displacement synchronism.
Description
Technical field
The present invention relates to the prestress tensioning equipment technical field for adopting in the engineering construction such as bridge, road, is specifically a kind of prestressing force intelligent tensioning electro-hydraulic servo equipment and controlling method thereof.
Background technique
Prestressed concrete structure is the important component part of modern structure engineering design and construction, and it is compared to ordinary reinforced concrete structure, has following major advantage: (1) saves engineering material, alleviates the deadweight of structure; (2) stress performance of structure or component can be improved, delay the cracking of component, Reducing distortion; (3) durability and the fatigue resistance of structure or component can be improved; (4) be adapted at all kinds of large-scale, greatly across, heavy duty, towering construction engineering; (5) can be used as assembled means and the use of reinforcing means.Therefore prestressed concrete structure has wide market application foreground.
In pre-stress construction, the stretch-draw of prestressed tendon is key link, and wherein stretch-draw precision is the most important condition determining prestressed structure safety and normal operation.The pressure of the intelligent tensioning equipment Real-time Collection jack of prior art and displacement, and these data feedbacks are calculated elongation automatically to data processing unit, check elongation error in time whether in predetermined range.But regulate the pressure between each jack and displacement synchronous comparatively complicated during stretch-draw symmetrical due to this enforcement, namely motor is adopted to regulate pressure and the displacement of two jack, therefore regulate very complicated, and then cause the complex structure of tensioning equipment, also make the synchronism of the precision of this equipment and force value and displacement also lower simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is, provide a kind of structure simple and add hold that lotus precision is high, force value and the good prestressing force intelligent tensioning electro-hydraulic servo equipment of displacement synchronous and controlling method thereof.
Technological scheme of the present invention is, provides a kind of prestressing force intelligent tensioning electro-hydraulic servo equipment, comprises a computer and multiple stage tensioning equipment; Every platform tensioning equipment includes:
For oil return apparatus, for providing to tensioning equipment and Ethylene recov force feed;
Bi-directional digital valve assembly, in order to realize tensioning equipment loading, hold lotus, unloading and commutation; This bi-directional digital valve assembly is communicated with for oil return apparatus;
Jack is the power executive component of tensioning equipment; This jack is communicated with for oil return apparatus, bi-directional digital valve assembly;
Control panel, for receiving the signal of bi-directional digital valve assembly and controlling the action of bi-directional digital valve assembly; This control panel is electrically connected with jack, bi-directional digital valve assembly, confession oil return apparatus;
The control panel of every platform tensioning equipment is all connected with computer, in order to control pulling test process and interpretation of result process.
Described bi-directional digital valve assembly comprises three position four-way directional control valve, speed reducer, stepper motor and reduction valve; Described speed reducer is provided with an output shaft that can stretch; Spool one end of described three position four-way directional control valve is threaded with the valve gap of three position four-way directional control valve; The other end of described spool is connected with the output shaft of speed reducer; The input shaft of described speed reducer is connected with the output shaft of stepper motor; The valve body of described three position four-way directional control valve is also connected with the body of speed reducer; One is also provided with for measuring the electro-optical pickoff of valve element position in described speed reducer; Described valve body is also provided with valve port a, valve port b, valve port p, the valve port t of fuel feeding turnover, described valve port a, valve port b, valve port t all with for oil return apparatus are communicated with; Described valve port p is communicated with reduction valve; Described stepper motor, electro-optical pickoff are all electrically connected with control panel.
Described speed reducer comprises casing, be located at casing in and intermeshing first gear and the second gear; The axial width of described first gear is greater than the axial width of the second gear.
Described comprises fuel tank, oil pump, oil purifier, relief valve, oil pressure sensor, pressure gauge for oil return apparatus; The filler opening of described oil pump is communicated with fuel tank, oil purifier respectively with oil outlet; Described oil purifier is communicated with valve port p; Described valve port a is communicated with a hydraulic fluid port of pressure gauge, oil pressure sensor, jack; Described valve port b is communicated with another hydraulic fluid port of relief valve, jack; Described relief valve, reduction valve are also communicated with fuel tank.
Be provided with the displacement transducer that can measure mandril of lifting jack outreach in described jack, described displacement transducer is electrically connected with control panel.
Be equipped with a radio receiving transmitting module in described control panel and computer, two described radio receiving transmitting module signals connect.
A controlling method for prestressing force intelligent tensioning electro-hydraulic servo equipment, comprises the following steps:
(1), start stretch-draw, each tensioning equipment carries out open loop loading by the valve port position of presetting separately;
(2), switch enter closed loop and load after the loading force of each tensioning equipment all reaches entrance power, each tensioning equipment carries out closed loop PID to power speed and actual forces speed and calculates and the valve element position regulating bi-directional digital valve in real time;
(3), computer detects the shift value of each end in real time, if find, offset deviation exceedes predefined value, bi-directional digital valve can be suspended and load, and waits for that two ends displacement amount reenter closed loop again and loads after identical;
(4), when each end power all reach hold lotus desired value after enter to insist on the lotus stage and start and hold lotus timing, holding the lotus stage keeps one end power closed loop control, and the other end open loop suspends;
(5) step (2), is returned and whether loading force without the need to again detecting partition reaches entrance, step (2), (3), (4) and complete default each loaded segment and after holding lotus section, multiple bi-directional digital valve carries out constant speed unloading are performed by circulation.
Further comprising the steps of between described step (3) and step (4): computer detects the spool meta of bi-directional digital valve in real time by detecting the electro-optical pickoff of multiple bi-directional digital valve, in stretching process loading with hold the lotus stage and regulate multiple bi-directional digital valve.
After adopting above structure and method, the present invention compared with prior art, has the following advantages:
Namely prestressing force intelligent tensioning electro-hydraulic servo equipment of the present invention can make this equipment high pressure add to hold lotus to stablize by bi-directional digital valve assembly, and force value precision is high, and therefore its structure is very simple, and control accuracy is also higher.And simultaneously by computer control, electro-optical pickoff and closed loop ensure that stretching process two ends power passage and displacement passage possess accurate synchronizing characteristics.The controlling method energy closed loop be applied on kind of prestressing force intelligent tensioning electro-hydraulic servo equipment regulates valve port position in real time, monitors offset deviation simultaneously, thus ensure that synchronous two sky of power and displacement, and this controlling method is stablized, and performs comparatively simple.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of prestressing force intelligent tensioning electro-hydraulic servo equipment of the present invention.
Fig. 2 is the sectional view of bi-directional digital valve.
Fig. 3 is the stretching process flow chart of application one embodiment of the present of invention.
Fig. 4 is that lotus closed loop algorithm block diagram is insisted in the stretch-draw of application one embodiment of the present of invention.
Fig. 5 is that the stretching force of application one embodiment of the present of invention loads closed loop algorithm block diagram.
Shown in figure 1, computer, 2, jack, 3, control panel, 4, three position four-way directional control valve, 4.1, spool, 4.2, valve gap, 4.3, valve body, 5, speed reducer, 6, stepper motor, 7, reduction valve, 8, electro-optical pickoff, 9, casing, 10, the first gear, the 11, second gear, 12, oil pump, 13, oil purifier, 14, relief valve, 15, oil pressure sensor, 16, pressure gauge, 17, fuel tank, 18, displacement transducer, 19, radio receiving transmitting module.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, a kind of prestressing force intelligent tensioning electro-hydraulic servo equipment, comprises a computer 1 and multiple stage tensioning equipment; Every platform tensioning equipment includes:
For oil return apparatus, for providing to tensioning equipment and Ethylene recov force feed;
Bi-directional digital valve assembly, in order to realize tensioning equipment loading, hold lotus, unloading and commutation; This bi-directional digital valve assembly is communicated with for oil return apparatus;
Jack 2, namely oil hydraulic cylinder are the power executive component of tensioning equipment; This jack 2 is communicated with for oil return apparatus, bi-directional digital valve assembly;
Control panel 3, for receiving the signal of bi-directional digital valve assembly and controlling the action of bi-directional digital valve assembly; This control panel 3 is electrically connected with jack 2, bi-directional digital valve assembly, confession oil return apparatus; Described control panel is provided with Master control chip circuit, displacement detecting circuit, voltage processing circuitry, optoelectronic induction testing circuit, communication circuit, oil pressure sensor processing circuit, foregoing circuit is all circuit conventional in related domain, and its concrete structure is not just describing in detail at this; Described Master control chip circuit is all connected with displacement detecting circuit, voltage processing circuitry, optoelectronic induction testing circuit, communication circuit, oil pressure sensor processing circuit.
The control panel 3 of every platform tensioning equipment is all connected with computer 1, in order to control pulling test process and interpretation of result process.
Described bi-directional digital valve assembly comprises three position four-way directional control valve 4, speed reducer 5, stepper motor 6 and reduction valve 7; Described speed reducer 5 is provided with an output shaft that can stretch; Spool 4.1 one end of described three position four-way directional control valve 4 is threaded with the valve gap 4.2 of three position four-way directional control valve 4; The other end of described spool 4.1 is connected with the output shaft of speed reducer 5; The input shaft of described speed reducer 5 is connected with the output shaft of stepper motor 6; The valve body 4.3 of described three position four-way directional control valve is also connected with the body of speed reducer 5; One is also provided with for measuring the electro-optical pickoff 8 of spool 4.1 position in described speed reducer 5, multiple optoelectronic induction pasters of electro-optical pickoff 8 are placed on the multiple position of spool respectively, the change of photoelectric sensor level can be inspired when valve core rotation covers optoelectronic induction paster, thus perceive valve core rotation to this position.The position of spool can also be perceived by electro-optical pickoff 8 distance measured between the second gear 11 and electro-optical pickoff 8.Described valve body 4.3 is also provided with valve port a, valve port b, valve port p, the valve port t of fuel feeding turnover, described valve port a, valve port b, valve port t all with for oil return apparatus are communicated with; Described valve port p is communicated with reduction valve 7; Described stepper motor 6, electro-optical pickoff 8 are all electrically connected with control panel 3.Screwed out by the screw-in of spool 4.1, what make spool can cover in valve port a, valve port b, valve port p, valve port t is one or more.
Described speed reducer comprises casing 9, is located in casing 9 and intermeshing first gear 10 and the second gear 11; The axial width of described first gear 10 is greater than the axial width of the second gear 11, and in the present embodiment, the first gear 10 and the second gear 11 can produce again both relative slidings while engagement, thus the back-out of the screw-in of spool 4.1 is achieved.
Described comprises fuel tank 17, oil pump 12, oil purifier 13, relief valve 14, oil pressure sensor 15, pressure gauge 16 for oil return apparatus; The filler opening of described oil pump 12 is communicated with fuel tank 17, oil purifier 13 respectively with oil outlet; Described oil purifier 13 is communicated with valve port p; Described valve port a is communicated with a hydraulic fluid port of pressure gauge 16, oil pressure sensor 15, jack 2; Described valve port b is communicated with another hydraulic fluid port of relief valve 14, jack 2; Described relief valve 14, reduction valve 9 are also communicated with fuel tank 17.
Be provided with the displacement transducer 18 that can measure jack 2 push rod outreach in described jack 2, described displacement transducer 18 is electrically connected with control panel 2.Displacement transducer is for increment type draw wire encoder, its by stretchable stainless steel cable around on a threaded wheel hub, this wheel hub and a precision rotation inductor link together, a corresponding circle exports the pulse of setting, and controller can obtain current delta position to the step-by-step counting exported.During installation, wheel hub and precision rotation inductor are arranged on the inner chamber of jack 2, wire rope is connected on the push rod of jack 2.
Be equipped with a radio receiving transmitting module 19 in described control panel and computer, two described radio receiving transmitting module 19 signals connect.
During use, driven the valve port of three position four-way directional control valve 4 by stepper motor 6, make hydraulic oil enter jack 2 interior to drive jack work, carried out the size of fine adjustment valve port by stepper motor 6 to control the pressure of jack 2 simultaneously.
A controlling method for prestressing force intelligent tensioning electro-hydraulic servo equipment, is characterized in that, comprise the following steps:
(1), start stretch-draw, each tensioning equipment carries out open loop loading by the valve port position of presetting separately;
(2), switch enter closed loop and load after the loading force of each tensioning equipment all reaches entrance power, each tensioning equipment carries out closed loop PID to power speed and actual forces speed and calculates and the valve element position regulating bi-directional digital valve in real time;
(3), computer detects the shift value of each end in real time, if find, offset deviation exceedes predefined value, bi-directional digital valve can be suspended and load, and waits for that two ends displacement amount reenter closed loop again and loads after identical;
(4), when each end power all reach hold lotus desired value after enter to insist on the lotus stage and start and hold lotus timing, holding the lotus stage keeps one end power closed loop control, and the other end open loop suspends;
(5) step (2), is returned and whether loading force without the need to again detecting partition reaches entrance, step (2), (3), (4) and complete default each loaded segment and after holding lotus section, multiple bi-directional digital valve carries out constant speed unloading are performed by circulation.
Further comprising the steps of between described step (3) and step (4): computer detects the spool meta of bi-directional digital valve in real time by detecting the electro-optical pickoff of multiple bi-directional digital valve, in stretching process loading with hold the lotus stage and regulate multiple bi-directional digital valve.
The stretching process flow process of application one embodiment of the present of invention is as follows: at bridge prestress muscle two ends installation in position jack 2, work anchor is fixed on jack 2, completes tension operation preliminary preparation.Open oil pump 12, open TT&C system and control, computer 1 TT&C software and control panel 3 start self-inspection, and self-inspection carries out automatic Tensioning operation by rear preparation.
First enter first stage control and prestressing force pretension stage, computer 1 issues the instruction of open loop valve port, and stepper motor 6 is adjusted to commitment positions according to valve port instruction and keeps bi-directional digital valve valve port to be opened to appointment first valve port position and fast lift valve mouth position.This staged pressure controls as opened loop control, control panel 3 is to gathering the pressure signal from oil pressure sensor 15 of coming in or the displacement signal of displacement transducer 18 carries out closed loop control, and pressure signal and displacement signal will be sent computer 1 back in real time and be shown in the main interface of TT&C software.
Entrance power i.e. the first force value has all been reached through converting when gathering each end pressure signal of coming in, show that each end has completed prestressed pretensioning operation, now will carry out rollback to each end bi-directional digital valve valve port position, after valve port position rollback completes, namely enter second stage i.e. the first force value load phase.This stage is power load phase, the closed loop control of power passage.Control panel Real-time Collection is converted into power rate of change actual value from the pressure signal of oil pressure sensor 15 and power rate of change desired value does closed loop control, calculates valve port opening instruction in real time and is also handed down to stepper motor 6 umber of pulse and direction instruction.Power loading speed can set, and is usually specified by TT&C software Test item on computer 1.The power preset in control panel 3 loads key one ring that closed loop control parameters is guarantee power loading performance, and the voltage-regulating system consisted of bi-directional digital valve and reduction valve 7 regulates in real time and loads force value speed.Simultaneously, in power loading procedure, control panel 3 detects the displacement signal from displacement transducer 18 in real time, and displacement signal will be delivered to computer 1, computer 1 TT&C software monitors displacement synchronous in real time, find that offset deviation exceedes the predefined value tensioned at one end equipment that then displacement is large and goes to time-out loading position by bi-directional digital valve valve port position, wait for that two ends displacement amount reenters the loading of power closed loop after identical again.
Reach first when gathering the pressure signal of coming in hold lotus force value through converting, show that the first force value load phase terminates.One end power passage closed loop was held lotus and was controlled, one end power passage opened loop control in order to insist on the lotus stage this stage.Power passage closed loop control one end control panel 3 Real-time Collection is converted into power actual value from the pressure signal of oil pressure sensor 15 and power desired value does closed loop control, calculates valve port opening instruction in real time and is also handed down to stepper motor 6 umber of pulse and direction instruction.That presets in control panel 3 insists on key one ring that lotus closed loop control parameters is guarantee power loading performance.Simultaneously, insisting in lotus process, control panel 3 detects the displacement signal from displacement transducer 18 in real time, and displacement signal will be delivered to computer 1, computer 1 TT&C software monitors displacement synchronous in real time, controls to intervene to guarantee displacement synchronous when occurring that displacement synchronous deviation is larger to insisting on lotus.
When first holds lotus and reach predetermined time, namely enter next stage, usually load and hold lotus and hocket and preset by computer 1 TT&C software Test item.Usually, hold after the load forces stage completes when maximum, show that stretch-draw loading procedure terminates to enter hydraulic system unloading phase.At unloading phase, relief valve 14 guarantee two-way top move back head-to-foot portion after pressure do not continue increase.
Below only just most preferred embodiment of the present invention is described, but can not be interpreted as it is limitations on claims.The present invention is not limited only to above embodiment, and its concrete structure allows to change.In every case the various change done in the protection domain of independent claims of the present invention is all in protection scope of the present invention.
Claims (8)
1. a prestressing force intelligent tensioning electro-hydraulic servo equipment, is characterized in that, comprises a computer (1) and multiple stage tensioning equipment; Every platform tensioning equipment includes:
For oil return apparatus, for providing to tensioning equipment and Ethylene recov force feed;
Bi-directional digital valve assembly, in order to realize tensioning equipment loading, hold lotus, unloading and commutation; This bi-directional digital valve assembly is communicated with for oil return apparatus;
Jack (2) is the power executive component of tensioning equipment; This jack (2) is communicated with for oil return apparatus, bi-directional digital valve assembly;
Control panel (3), for receiving the signal of bi-directional digital valve assembly and controlling the action of bi-directional digital valve assembly; This control panel (3) is electrically connected with jack (2), bi-directional digital valve assembly, confession oil return apparatus;
The control panel (3) of every platform tensioning equipment is all connected with computer (1), in order to control pulling test process and interpretation of result process.
2. prestressing force intelligent tensioning electro-hydraulic servo equipment according to claim 1, is characterized in that: described bi-directional digital valve assembly comprises three position four-way directional control valve (4), speed reducer (5), stepper motor (6) and reduction valve (7); Described speed reducer (5) is provided with an output shaft that can stretch; Spool (4.1) one end of described three position four-way directional control valve (4) is threaded with the valve gap (4.2) of three position four-way directional control valve (4); The other end of described spool (4.1) is connected with the output shaft of speed reducer (5); The input shaft of described speed reducer (5) is connected with the output shaft of stepper motor (6); The valve body (4.3) of described three position four-way directional control valve is also connected with the body of speed reducer (5); One is also provided with for measuring the electro-optical pickoff (8) of spool (4.1) position in described speed reducer (5); Described valve body (4.3) is also provided with valve port a, valve port b, valve port p, the valve port t of fuel feeding turnover, described valve port a, valve port b, valve port t all with for oil return apparatus are communicated with; Described valve port p is communicated with reduction valve (7); Described stepper motor (6), electro-optical pickoff (8) are all electrically connected with control panel (3).
3. prestressing force intelligent tensioning electro-hydraulic servo equipment according to claim 2, is characterized in that: described speed reducer comprises casing (9), be located at casing (9) in and intermeshing first gear (10) and the second gear (11); The axial width of described first gear (10) is greater than the axial width of the second gear (11).
4. prestressing force intelligent tensioning electro-hydraulic servo equipment according to claim 2, is characterized in that: described comprises fuel tank (17), oil pump (12), oil purifier (13), relief valve (14), oil pressure sensor (15), pressure gauge (16) for oil return apparatus; The filler opening of described oil pump (12) is communicated with fuel tank (17), oil purifier (13) respectively with oil outlet; Described oil purifier (13) is communicated with valve port p; Described valve port a is communicated with a hydraulic fluid port of pressure gauge (16), oil pressure sensor (15), jack (2); Described valve port b is communicated with another hydraulic fluid port of relief valve (14), jack (2); Described relief valve (14), reduction valve (9) are also communicated with fuel tank (17).
5. prestressing force intelligent tensioning electro-hydraulic servo equipment according to claim 1, it is characterized in that: be provided with the displacement transducer (18) that can measure jack (2) push rod outreach in described jack (2), described displacement transducer (18) is electrically connected with control panel (2).
6. prestressing force intelligent tensioning electro-hydraulic servo equipment according to claim 1, it is characterized in that: be equipped with a radio receiving transmitting module (19) in described control panel and computer, two described radio receiving transmitting module (19) signals connect.
7. a controlling method for prestressing force intelligent tensioning electro-hydraulic servo equipment, is characterized in that, comprise the following steps:
(1), start stretch-draw, each tensioning equipment carries out open loop loading by the valve port position of presetting separately;
(2), switch enter closed loop and load after the loading force of each tensioning equipment all reaches entrance power, each tensioning equipment carries out closed loop PID to power speed and actual forces speed and calculates and the valve element position regulating bi-directional digital valve in real time;
(3), computer detects the shift value of each end in real time, if find, offset deviation exceedes predefined value, bi-directional digital valve can be suspended and load, and waits for that two ends displacement amount reenter closed loop again and loads after identical;
(4), when each end power all reach hold lotus desired value after enter to insist on the lotus stage and start and hold lotus timing, holding the lotus stage keeps one end power closed loop control, and the other end open loop suspends;
(5) step (2), is returned and whether loading force without the need to again detecting partition reaches entrance, step (2), (3), (4) and complete default each loaded segment and after holding lotus section, multiple bi-directional digital valve carries out constant speed unloading are performed by circulation.
8. the controlling method of a kind of prestressing force intelligent tensioning electro-hydraulic servo equipment according to claim 7, it is characterized in that: further comprising the steps of between described step (3) and step (4): computer detects the spool meta of bi-directional digital valve in real time by detecting the electro-optical pickoff of multiple bi-directional digital valve, in stretching process loading with hold the lotus stage and regulate multiple bi-directional digital valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510080158.9A CN104675782B (en) | 2015-02-13 | 2015-02-13 | Prestressing force intelligent tensioning electro-hydraulic servo equipment and control method thereof |
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|---|---|---|---|
| CN201510080158.9A CN104675782B (en) | 2015-02-13 | 2015-02-13 | Prestressing force intelligent tensioning electro-hydraulic servo equipment and control method thereof |
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| CN104675782A true CN104675782A (en) | 2015-06-03 |
| CN104675782B CN104675782B (en) | 2016-11-23 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108167245A (en) * | 2018-03-02 | 2018-06-15 | 苏州铁马自动化科技有限公司 | It is a kind of to utilize servo motor and the hydraulic servo control system of digital valve |
| CN109695607A (en) * | 2019-01-30 | 2019-04-30 | 台州职业技术学院 | A kind of pump valve cooperative control method for prestressing force intelligent tensioning equipment |
| CN111521322A (en) * | 2020-06-03 | 2020-08-11 | 苏州铁马自动化科技有限公司 | Electro-hydraulic servo equipment for force standard machine and control method thereof |
| CN112648245A (en) * | 2020-12-22 | 2021-04-13 | 苏州铁马自动化科技有限公司 | Electro-hydraulic servo equipment for tablet press |
| CN114321035A (en) * | 2021-12-29 | 2022-04-12 | 筑友智造智能科技有限公司 | Intelligent tensioning equipment for prestressed reinforcement |
| CN114348895A (en) * | 2021-12-17 | 2022-04-15 | 湖北工业大学 | Intelligent jack device for prestress steel beam test |
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| CN101487481A (en) * | 2008-12-30 | 2009-07-22 | 杭州鑫高科技有限公司 | Speed and pressure-regulating hydraulic system |
| CN201560996U (en) * | 2009-10-24 | 2010-08-25 | 福州恒拓工业自动化有限公司 | Automatic control system for speed regulating valve in combination valve of steel bar tension machine |
| CN202826047U (en) * | 2012-07-18 | 2013-03-27 | 北京市路兴公路新技术有限公司 | Prestress tensioning system |
| CN103629173B (en) * | 2013-11-28 | 2015-12-02 | 湖南联智桥隧技术有限公司 | Prestressed stretch-draw hydraulic system, prestress tensioning equipment and controlling method thereof |
| CN104111670B (en) * | 2014-06-20 | 2017-01-25 | 杭州浙锚预应力有限公司 | Prestressed tension control system and control method |
| CN204436925U (en) * | 2015-02-13 | 2015-07-01 | 杭州测易科技有限公司 | Prestressing force intelligent tensioning electro-hydraulic servo equipment |
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2015
- 2015-02-13 CN CN201510080158.9A patent/CN104675782B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108167245A (en) * | 2018-03-02 | 2018-06-15 | 苏州铁马自动化科技有限公司 | It is a kind of to utilize servo motor and the hydraulic servo control system of digital valve |
| CN109695607A (en) * | 2019-01-30 | 2019-04-30 | 台州职业技术学院 | A kind of pump valve cooperative control method for prestressing force intelligent tensioning equipment |
| CN111521322A (en) * | 2020-06-03 | 2020-08-11 | 苏州铁马自动化科技有限公司 | Electro-hydraulic servo equipment for force standard machine and control method thereof |
| CN111521322B (en) * | 2020-06-03 | 2021-08-17 | 苏州铁马自动化科技有限公司 | Electro-hydraulic servo equipment for force standard machine and control method thereof |
| CN112648245A (en) * | 2020-12-22 | 2021-04-13 | 苏州铁马自动化科技有限公司 | Electro-hydraulic servo equipment for tablet press |
| CN114348895A (en) * | 2021-12-17 | 2022-04-15 | 湖北工业大学 | Intelligent jack device for prestress steel beam test |
| CN114348895B (en) * | 2021-12-17 | 2023-12-12 | 湖北工业大学 | Intelligent jack device for prestress steel beam test |
| CN114321035A (en) * | 2021-12-29 | 2022-04-12 | 筑友智造智能科技有限公司 | Intelligent tensioning equipment for prestressed reinforcement |
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