CN104314905B - Prestressing force intelligent tensioning hydraulic system, prestress tensioning equipment and its control method - Google Patents
Prestressing force intelligent tensioning hydraulic system, prestress tensioning equipment and its control method Download PDFInfo
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- CN104314905B CN104314905B CN201410539290.7A CN201410539290A CN104314905B CN 104314905 B CN104314905 B CN 104314905B CN 201410539290 A CN201410539290 A CN 201410539290A CN 104314905 B CN104314905 B CN 104314905B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000002828 fuel tank Substances 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims description 76
- 230000001360 synchronised effect Effects 0.000 claims description 22
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 6
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- 210000001367 artery Anatomy 0.000 claims 1
- 238000004080 punching Methods 0.000 claims 1
- 210000003462 vein Anatomy 0.000 claims 1
- 239000003921 oil Substances 0.000 abstract description 37
- 239000010727 cylinder oil Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 8
- 239000012530 fluid Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 238000011217 control strategy Methods 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
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Classifications
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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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- 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
- F15B21/08—Servomotor systems incorporating electrically operated control means
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Abstract
The present invention relates to a kind of prestressing force intelligent tensioning hydraulic system, prestress tensioning equipment and its control method.The prestressing force intelligent tensioning hydraulic system includes the first overflow valve, the second overflow valve, digital valve, hydraulic control one-way valve and volume control device；The valve export of the hydraulic control one-way valve and the A chambers of jack cylinder oil cylinder, valve inlet is connected with the volume control device, and the oil circuit outlet that leaks of the hydraulic control one-way valve is in the volume control device；The digital valve is arranged between the hydraulic control one-way valve and the volume control device；Second overflow valve is arranged at the oil circuit that leaks of the hydraulic control one-way valve and exports and the volume control device between；First overflow valve is connected with the volume control device；The volume control device is connected with fuel tank.This prestressing force intelligent tensioning hydraulic system strong applicability, low production cost.
Description
Technical field
A kind of the present invention relates to engineering construction equipment technical field such as road, bridge, more particularly to prestressing force intelligent tensioning
Hydraulic system.Moreover, it relates to a kind of prestress tensioning equipment including above-mentioned prestressing force intelligent tensioning hydraulic system
Control method with the prestress tensioning equipment.
Background technology
During bridge stretching construction generally using intelligent tensioning system gather in real time jack cylinder pressure and
Displacement, and data processing unit is fed back to, data processing unit calculates the elongation of presstressed reinforcing steel with this, so as in real time
Whether the elongation error for checking presstressed reinforcing steel controls《Highway bridge and culvert construction technique normalizing》7.6.3 regulation " its deviation
Should control ± 6% " in the range of.But the pressure being adjusted in synchronism when symmetrical tensioning is carried out between each jack cylinder and position
Shifting is complex, due to《Highway bridge and culvert construction technique normalizing》7.12.2 regulation " synchronous tension power between each jack cylinder
Allowable error be preferably ± 2% ".The complexity of synchronous adjustment is mainly shown as that adjusting two systems using a controlled device becomes
Amount, for example, adjust pressure and the displacement of jack cylinder by Frequency Converter Control motor speed, such method comparison is complicated,
Poor for applicability.Additionally, occasional causes the leakage of tensioning equipment or Liang Chang when the frequency converter of intelligent tensioning system is in running order
Non-electricity protector trips.The presence of the problems referred to above causes the production cost of intelligent tensioning system to increase.Therefore, it is badly in need of a kind of applicability
By force, the prestressing force intelligent tensioning hydraulic system of low production cost, to solve the above-mentioned problems in the prior art.
Content of the invention
For above-mentioned problem, the present invention proposes a kind of prestressing force intelligent tensioning hydraulic system, this prestressing force intelligence
Tensioning hydraulic system strong applicability, low production cost.The invention allows for a kind of prestress tensioning equipment and the prestressing force
The control method of tensioning equipment.
The prestressing force intelligent tensioning hydraulic system for proposing according to the first aspect of the invention, which includes the first overflow
Valve, the second overflow valve, digital valve, hydraulic control one-way valve and volume control device；The valve export of the hydraulic control one-way valve and thousand
The A chambers of jin top oil cylinder oil cylinder, valve inlet connect with the volume control device, and the hydraulic control one-way valve outward
Draining way outlet is communicated in the volume control device；The digital valve is arranged on the hydraulic control one-way valve and flow control
Between device；Second overflow valve be arranged at the hydraulic control one-way valve leak oil circuit outlet and the volume control device it
Between；First overflow valve is connected with the volume control device；The volume control device is connected with fuel tank.
In one embodiment, the volume control device includes the first reversal valve, the second reversal valve, check valve and determines
Dispensing pump, the quantitative oil pump are arranged between fuel tank and first reversal valve, and the check valve is arranged on described first and changes
To between the first actuator port of valve and the digital valve, second reversal valve is arranged at the quantitative oil pump and described very heavy
Between the B chambers of top oil cylinder, and an actuator port of second reversal valve is communicated in the check valve and the numeral
Between valve, the oil circuit outlet that leaks of wherein described hydraulic control one-way valve is connected to the second actuator port of first reversal valve.
In one embodiment, the volume control device also includes pressure gauge, and the pressure gauge is arranged and described first
Overflow valve connects.
In one embodiment, first reversal valve be three position four-way directional control valve, the A works of the three position four-way directional control valve
Make hydraulic fluid port and connect the check valve, the B actuator ports of the three position four-way directional control valve are connected to leaking for the hydraulic control one-way valve
Oil circuit is exported, and/or second reversal valve is two-position four way change valve, and the A actuator ports of the two-position four way change valve connect
Pass through between the check valve and the digital valve, the B actuator ports of the two-position four way change valve are connected to the jack
The B chambers of oil cylinder.
In one embodiment, by driving stepper motor, the stepper motor is by PLC control for the digital valve.
The prestress tensioning equipment for providing according to the second aspect of the invention, it include jack cylinder and 2n platform tensioning
Equipment, n are at least 1；The jack cylinder includes jack cylinder oil cylinder, the pressure of measurement jack cylinder oil cylinder internal pressure
Force snesor and the displacement transducer of measurement jack cylinder oil cylinder piston moving displacement；The tensioning equipment is included according to upper
Prestressing force intelligent tensioning hydraulic system described in text；The A chambers and B chambers of the jack cylinder oil cylinder passes through high-pressure oil pipe
With the oil communication of the tensioning equipment, the pressure sensor and institute's displacement sensors by shielded cable with described
The connection of tensioning equipment.
The control method of the prestress tensioning equipment as described above for providing according to the third aspect of the invention we, it include with
Lower step：Displacement synchronous regulating step：Give the stepper motor corresponding to the digital valve of each tensioning equipment to debug in advance
Pulse, corresponding tensioning equipment is adjusted by the difference of the displacement transducer corresponding to the jack cylinder of each tensioning equipment
Step motor position；Control stretching force rate of rise step：With any equipment as control main frame, to set stretching force increasing
Long speed be targeted rate, the step motor position with the tensioning equipment as controlled plant, with the jack oil of the tensioning equipment
The growth rate of cylinder A cavity pressures carries out PID regulations with targeted rate difference for feedback；Symmetrical tensioning step：Remaining 2n-1 platform tensioning
Equipment starts PID controls as control slave when the control slave is poor with the force value of the control main frame exceedes setting range
Device processed controls the step pitch of the stepper motor of the control slave.
In one embodiment, first reversal valve is three position four-way directional control valve, wraps in displacement synchronous regulating step
Include and corresponding three position four-way directional control valve state is adjusted by the displacement transducer difference of each jack cylinder, to realize each jack
The displacement synchronous of oil cylinder.
In one embodiment, the concrete control mode of PID controller is with the control slave and the control main frame
Middle jack cylinder force value difference is input, and the step pitch with the stepper motor adjustment for controlling slave controls the control as output
The driving stepper motor of slave processed to specified location, to realize that the force value of the jack cylinder of the control slave follows the control
The force value of the jack cylinder of main frame processed.
Using the control method of the prestress tensioning equipment of the present invention, by step pitch and/or the 3-position 4-way of stepper motor
The state of reversal valve controlling the synchronism of pressure and displacement during tensioning, the degree of accuracy is high, synchronism adjust control algorithm simple,
Strong applicability.
In addition to objects, features and advantages described above, the present invention also has other objects, features and advantages.
Below with reference to figure, the present invention will be further described in detail.
Description of the drawings
Hereinafter the present invention will be described in more detail based on embodiment refer to the attached drawing.Wherein：
Fig. 1 is the schematic diagram of prestressing force intelligent tensioning hydraulic system according to a preferred embodiment of the present invention；
Fig. 2 is the schematic diagram of prestress tensioning equipment according to a preferred embodiment of the present invention；
Fig. 3 is the tensioning flow chart of a preferred embodiment of prestress tensioning equipment shown in Fig. 2；
Fig. 4 is the control strategy letter that the displacement synchronous of control method according to a preferred embodiment of the present invention are adjusted
Figure；
Fig. 5 is control stretching force rate of rise and synchronization in control method according to a preferred embodiment of the present invention
The control strategy figure of tensioning.
In figure, identical component is indicated by identical reference.Accompanying drawing is not drawn according to actual ratio.
Specific embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
As shown in figure 1, the prestressing force intelligent tensioning hydraulic system that the present invention is provided includes the first overflow valve 60, the second overflow
Valve 50, digital valve 40, hydraulic control one-way valve 27 and volume control device 20.The prestressing force intelligence of the present invention will be described in detail belows
Can tensioning hydraulic system and its various pieces.
As depicted in figs. 1 and 2, the A chambers of the valve export of hydraulic control one-way valve 27 and jack cylinder 10, valve enter
Mouth is connected with volume control device 20, and the oil circuit outlet that leaks of hydraulic control one-way valve 27 is in volume control device 20.Thousand
Jin top oil cylinder 10 is provided with the pressure of pressure sensor 11 and displacement transducer 12 for the A chambers of monitoring jack cylinder 10
And the displacement of the piston in jack cylinder 10.
As shown in figure 1, digital valve 40 is arranged between hydraulic control one-way valve 27 and volume control device 20.Digital valve 40 is by step
Stepper motor 26 (referring to Fig. 2) drives, and preferably, stepper motor 26 is by PLC control.
Second overflow valve 50 is arranged at the oil circuit that leaks of hydraulic control one-way valve 27 and exports and volume control device 20 between.
First overflow valve 60 is connected with volume control device 20；Volume control device 20 is connected with fuel tank 70.
In one embodiment, as shown in figure 1, volume control device 20 include the first reversal valve 21, the second reversal valve 24,
Check valve 27 and quantitative oil pump 22, quantitative oil pump 22 are arranged between fuel tank 70 and the first reversal valve 21, and check valve 27 is arranged
Between the first actuator port of the first reversal valve 21 and digital valve 40, the second reversal valve 24 is arranged on quantitative oil pump 22 and very heavy
Between the B chambers of top oil cylinder 10, and an actuator port of the second reversal valve 24 be communicated in check valve 27 and digital valve 40 it
Between, the oil circuit outlet that leaks of wherein hydraulic control one-way valve 27 is connected to the second actuator port of the first reversal valve 21.Preferably,
Volume control device 20 also includes that pressure gauge 25, pressure gauge 25 are connected with the first overflow valve 60.
As preferred embodiment, the first reversal valve 21 as shown in Figure 1 be three position four-way directional control valve, three position four-way directional control valve
A actuator ports connection check valve 27, the B actuator ports of three position four-way directional control valve are connected to the oil circuit that leaks of hydraulic control one-way valve 27
Outlet.Further, the second reversal valve 24 is two-position four way change valve, and the A actuator ports of two-position four way change valve are communicated in list
To between valve 27 and digital valve 40, the B actuator ports of two-position four way change valve are connected to the B chambers of jack cylinder 10.
Referring to shown in Fig. 1 and Fig. 2, digital valve 40 controls stepper motor 26 by PLC, and thus stepper motor 26 drives
The push rod of dynamic digital valve 40 moves forward and backward, and push rod moves forward and backward the poppet spool valve that can change that stage clip puts on digital valve 40
Pretightning force, so that reach the purpose for adjusting oil pressure relief.
Include that jack and 2n platform tensioning equipments, n are at least 1 according to the prestress tensioning equipment that the present invention is provided.By
This can realize symmetrical tensioning.Jack includes jack cylinder 10, the pressure sensing of measurement 10 internal pressure of jack cylinder
The displacement transducer 12 of the piston moving displacement of device 11 and measurement jack cylinder 10.Wherein, as shown in Fig. 2 tensioning equipment
Including according to prestressing force intelligent tensioning hydraulic system mentioned above.The A chambers and B chambers of jack cylinder 10 passes through high pressure
Oil pipe and the oil communication of tensioning equipment, pressure sensor 11 and displacement transducer 12 are by shielded cable and tensioning equipment
Connection.
As shown in Fig. 2 installing above-mentioned all kinds of valves using integrated valve block 30 in tensioning equipment.Integrated valve block 30 can include
Already installed first overflow valve 60 and the second overflow valve 50 and check valve 27.1 is installed in addition on integrated valve block 30
Three position four-way directional control valve, 1 two-position four way change valve, 1 hydraulic control one-way valve 30 and 1 digital valve 40.It is achieved in all kinds of valves
Installation in tensioning equipment.
Referring to Fig. 1 and Fig. 3, the workflow (referring to Fig. 3) of tensioning equipment：Start automatic Tensioning, open motor and three-dimensional
Four-way change-over valve, stepper motor operate to specified location, next gather the A chambers of the jack cylinder 10 of each tensioning equipment
Pressure value and displacement, to carry out, ensuing Simultaneous Pressure adjusts control and displacement synchronous adjust control.Enter first
Row Simultaneous Pressure adjusts control, judges the A chambers of the jack cylinder 10 of other slave tensioning equipments of main frame tensioning equipment
Pulling force difference whether be more than 1.5%, if it is, starting pulling force incremental timestamp device to adjust the number of slave tensioning equipment
The pretightning force of word valve.Then displacement synchronous adjust control, judge the jack oil of the slave tensioning equipment of main frame tensioning equipment
Whether the shift differences of the A chambers of cylinder 10 are more than 2mm, and are less than 20mm？In addition, main frame tensioning equipment and slave tensioning equipment
The pulling force difference of the A chambers of jack cylinder 10 is not more than 1.5% situation and also executes the above-mentioned judgement step for sentencing shift differences,
If it does, the state of adjustment three position four-way directional control valve, then judges whether tensioning completes, if it is, stop tensioning, such as
Fruit is not the A chambeies of the jack cylinder 10 of the main frame tensioning equipment and slave tensioning equipment that then resurvey each tensioning equipment
The pressure value of room and displacement, are again introduced into the deterministic process of pressure value and shift differences.If wherein main frame tensioning equipment
The shift differences of A chambers of jack cylinder 10 of slave tensioning equipment be not more than 2mm, and be less than 20mm, then further sentence
Whether the shift differences of the A chambers of the jack cylinder of disconnected main frame tensioning equipment and slave tensioning equipment are more than 20mm？If no
The step of being the three position four-way directional control valve state for then also executing adjustment slave tensioning equipment.And main frame tensioning equipment and slave
In the case that the shift differences of the A chambers of the jack cylinder of drawing equipment are greater than 20mm, suspend tensioning, exclude abnormal conditions simultaneously
Automatic Tensioning is started again at after reparation.The specific works situation of all parts in prestressing force pull system shown in Fig. 1 is：Motor
23 drive 22 pump oil of oil pump, and motor can be without arrangements for speed regulation, and the first overflow valve 60 ensures the prestressing force intelligent tensioning hydraulic pressure system
Rated pressure of the pressure of system less than system design.During normal tensioning oil-feed, the coil of motor 23 and three position four-way directional control valve
2DT obtains electric, other electromagnetic valve coil dead electricity, and fluid enters the A of jack cylinder 10 through check valve 27 and hydraulic control one-way valve 30
Chamber, to stretch steel hinge line, reaches slow pressurization and pressure by the pretightning force (realizing by its stage clip) for adjusting digital valve 40
The purpose that displacement synchronous are adjusted, and speed is adjustable.During normal tensioning drain charge, motor 23 and three position four-way directional control valve coil 1DT
Electric, other electromagnetic valve coil dead electricity, fluid backs down hydraulic control one-way valve 30, adjust digital valve pretightning force reach slow pressure release and
The purpose that synchronism is adjusted, and speed is adjustable.When oil is moved back in normal tensioning, motor 23, three position four-way directional control valve coil 1DT and two
Four-way change-over valve coil 3DT obtains electric, other electromagnetic valve coil dead electricity, and fluid enters the B chambeies of jack cylinder 10, in its A chamber
Fluid flows back to fuel tank 70 through three position four-way directional control valve, reaches the purpose of quick oil return.
The control method such as prestress tensioning equipment above for providing according to the third aspect of the invention we, which includes following step
Suddenly：Displacement synchronous regulating step, control stretching force rate of rise step and symmetrical tensioning step.
Displacement synchronous regulating step is referring to Fig. 4：Give the stepper motor corresponding to the digital valve 40 of each tensioning equipment
The 26 advance pulses that has debugged, by the difference of the displacement transducer 12 corresponding to the jack cylinder 10 of each tensioning equipment come
Adjust 26 position of stepper motor of corresponding tensioning equipment.Displacement synchronous i.e. before pressure is set up are adjusted, start first into
Oil, each displacement transducer read the displacement of the A chambers of the jack cylinder 10 of each tensioning equipment after resetting, judge maximum
Whether the difference of displacement and maximum displacement is more than control accuracy, if it is, the tensioning turned down corresponding to maximum displacement sets
The aperture of standby digital valve, gathers the A chambers of the jack cylinder 10 of each tensioning equipment again after reducing its oil inlet quantity
Displacement, if the difference of maximum displacement and maximum displacement less than control accuracy, determine whether maximum displacement and
The difference of maximum displacement whether more than 0.6 times control accuracy, if it is, judge again maximum displacement and other each
Whether the displacement of the A chambers of the jack cylinder 10 of drawing equipment is more than 0.8 times of control accuracy, if it is, closing three
Four-way change-over valve, stops rising top.If it is not, then opening three position four-way directional control valve, start and rise top.Start and rise top or dominant bit
In the case of control accuracy of the difference of shifting amount and maximum displacement less than 0.6 times, the jack of each tensioning equipment is judged
Whether oil cylinder 10 sets up pressure, if it is terminates the regulation of displacement synchronism, if it is not, then again reading off each tensioning equipment
Jack cylinder 10 A chambers displacement, carry out the judgement of displacement difference again.
Control stretching force rate of rise step, referring to Fig. 5：With any equipment as control main frame, to set stretching force
Rate of rise is targeted rate, 26 position of stepper motor with the tensioning equipment as controlled plant, with the very heavy of the tensioning equipment
The growth rate of the A cavity pressures of top oil cylinder 10 carries out PID regulations with targeted rate difference for feedback.As shown in figure 5, being controlled by PLC
Stepper motor corresponding to the digital valve of main frame tensioning equipment is fed to device processed the pulse that has debugged in advance, and by slave tensioning
Stepper motor corresponding to the digital valve of equipment feeds so far umber of pulse, in the control process of actual stretching force rate of rise, leads to
The displacement of the A chambers of the jack cylinder 10 of displacement transducer collection main frame tensioning equipment is crossed, to obtain main frame tensioning equipment
Actual stretching force rate of rise.Thus PID controller can be adjusted according to the actual stretching force rate of rise and targeted rate
The umber of pulse of the stepper motor corresponding to the digital valve of main frame tensioning equipment, is achieved in the control of main frame stretching force rate of rise
System.
Symmetrical tensioning step, referring to Fig. 5：Remaining 2n-1 platforms tensioning equipment as control slave, when control slave and control
When the force value difference of main frame exceedes setting range, start the step pitch of the stepper motor 26 of PID controller control control slave.Such as Fig. 5
Shown, while the stretching force rate of rise of control main frame tensioning equipment, execute symmetrical tensioning step, wherein, main frame tensioning
By corresponding displacement Chang'an, which obtains the displacement of the A chambers of the jack cylinder 10 of equipment and slave tensioning equipment respectively,
Start PID controller when the synchronous pulling force profit of slave tensioning equipment and main frame tensioning equipment is more than 1.5% and calculate slave
After the completion of stepper motor corresponding to the digital valve of drawing equipment needs the step pitch of adjustment, PID controller to calculate, slave tensioning is controlled
Driving stepper motor corresponding to the digital valve of equipment is to specified location；Synchronization when main frame tensioning equipment and slave tensioning equipment
When pulling force power difference is not above 1.5%, terminate synchronous tension step.
In one embodiment, the first reversal valve 21 is three position four-way directional control valve, and displacement synchronous regulating step includes
Corresponding three position four-way directional control valve state is adjusted by the difference of displacement transducer 12 of each jack cylinder 10, to realize that each is very heavy
The displacement synchronous of top oil cylinder 10.
In one embodiment, the concrete control mode of PID controller is controlling jack in slave and control main frame
10 force value of oil cylinder difference for input, with control slave stepper motor 2 adjust step pitch as output, control control slave stepping electricity
Machine 26 is driven to specified location, to realize the jack cylinder of the force value model- following control main frame of the jack cylinder 10 for controlling slave
10 force value.
The prestressing force intelligent tensioning system of the present invention is made up of 2n platform tensioning equipments, and it is maximum logical by adopted that n is at least 1, n
News mode determines.Oil-feed stretching force rate of rise, displacement synchronous and power synchronism regulatory function when the system has, while tool
There is drain charge power synchronism regulatory function；Displacement synchronous degree of regulation ± 2mm, power synchronism degree of regulation ± 2%.Stretching force increases
Long rate adaptation is adjusted using PID, and displacement synchronous adopt equivalent formula control strategy, power synchronously to adopt master-slave mode Synchronization Control plan
Slightly.
Although by reference to preferred embodiment, invention has been described, in the situation without departing from the scope of the present invention
Under, various improvement can be carried out to which and part therein can be replaced with equivalent.The invention is not limited in public in text
The specific embodiment that opens, but all technical schemes including falling within the scope of the appended claims.
Claims (2)
1. a kind of control method of prestress tensioning equipment, it is characterised in that
The prestress tensioning equipment, including jack and 2n platform tensioning equipments, n is at least 1；
The jack includes jack cylinder, the pressure sensor of measurement jack cylinder internal pressure and measurement jack
The displacement transducer of oil cylinder piston moving displacement；
The tensioning equipment includes prestressing force intelligent tensioning hydraulic system；
The prestressing force intelligent tensioning hydraulic system, including：First overflow valve, the second overflow valve, digital valve, hydraulic control one-way valve with
And volume control device；
The valve export of the hydraulic control one-way valve and the A chambers of jack cylinder, valve inlet and flow control dress
Connection is put, and the oil circuit outlet that leaks of the hydraulic control one-way valve is in the volume control device；
The digital valve is arranged between the hydraulic control one-way valve and the volume control device；
Second overflow valve is arranged at the oil circuit that leaks of the hydraulic control one-way valve and exports and the volume control device between；
First overflow valve is connected with the volume control device；
The volume control device is connected with fuel tank,
The A chambers and B chambers of the jack cylinder passes through the oil communication of high-pressure oil pipe and the tensioning equipment, the pressure
Force snesor and institute's displacement sensors pass through the connection of shielded cable and the tensioning equipment,
The method comprising the steps of：
Displacement synchronous regulating step：Give the arteries and veins that the stepper motor corresponding to the digital valve of each tensioning equipment has been debugged in advance
Punching, adjusts the stepping electricity of corresponding tensioning equipment by the displacement transducer difference corresponding to the jack cylinder of each tensioning equipment
Put seat in the plane；
Control stretching force rate of rise step：With any tensioning equipment as control main frame, to set stretching force rate of rise
For targeted rate, the step motor position with the tensioning equipment is pressed as controlled plant with the jack cylinder A chambeies of the tensioning equipment
The growth rate of power carries out PID regulations with targeted rate difference for feedback；
Symmetrical tensioning step：Remaining 2n-1 platforms tensioning equipment controls slave and the control main frame as control slave when described
Force value difference exceed setting range when, start PID controller control described control slave stepper motor step pitch,
The displacement synchronous regulating step is comprised the following steps：
Displacement synchronous before setting up pressure are adjusted, and start oil-feed first, and each displacement transducer reads each after resetting
The displacement of the A chambers of the jack cylinder of drawing equipment, judges whether maximum displacement and the difference of maximum displacement are more than control
Precision processed, if it is, turn down the aperture of the digital valve of the tensioning equipment corresponding to maximum displacement, reduces after its oil inlet quantity again
The displacement of the A chambers of the secondary jack cylinder for gathering each tensioning equipment, if the difference of maximum displacement and maximum displacement
Value then determines whether the difference of the maximum displacement and maximum displacement whether control essence more than 0.6 times less than control accuracy
Degree, if it is, judge the displacement of the A chambers of the jack cylinder of other each tensioning equipments and the difference of maximum displacement again
Whether value is more than 0.8 times of control accuracy, if it is, stopping rising top, if it is not, starting liter top, starts and rises top or maximum
In the case of control accuracy of the difference of displacement and maximum displacement less than 0.6 times, the jack of each tensioning equipment is judged
Whether oil cylinder sets up pressure, if it is terminates the regulation of displacement synchronism, if it is not, then again reading off each tensioning equipment
The displacement of the A chambers of jack cylinder, carries out the judgement of displacement difference again.
2. the control method of prestress tensioning equipment according to claim 1, it is characterised in that PID controller concrete
Control mode is with the jack cylinder force value difference that controls in slave and the control main frame as input, with the control slave
Stepper motor adjustment step pitch for output, control described control slave driving stepper motor to specified location, to realize
State control slave jack cylinder force value follow the control main frame jack cylinder force value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410539290.7A CN104314905B (en) | 2014-10-14 | 2014-10-14 | Prestressing force intelligent tensioning hydraulic system, prestress tensioning equipment and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410539290.7A CN104314905B (en) | 2014-10-14 | 2014-10-14 | Prestressing force intelligent tensioning hydraulic system, prestress tensioning equipment and its control method |
Publications (2)
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| CN104792623A (en) * | 2015-04-23 | 2015-07-22 | 南华大学 | Full-automatic rock point load test instrument |
| CN104965533A (en) * | 2015-04-27 | 2015-10-07 | 同济大学 | Pre-stress single-end single-jack intelligent tensioning control system |
| CN104947592B (en) * | 2015-04-30 | 2017-03-15 | 湖南联智桥隧技术有限公司 | The tensioning of cable-styled bridge sling and tune rope construction method |
| CN104762884B (en) * | 2015-04-30 | 2017-04-05 | 湖南联智桥隧技术有限公司 | The control method of Multipoint synchronous intelligent tensioning system |
| CN105887683A (en) * | 2016-04-11 | 2016-08-24 | 长安大学 | Prestressed tensioning system |
| JP6896484B2 (en) * | 2017-03-31 | 2021-06-30 | 住友重機械工業株式会社 | Position control device, hydraulic drive device |
| CN108487644A (en) * | 2018-02-01 | 2018-09-04 | 重庆恒佳工程技术咨询有限公司 | A kind of prestressed stretch-draw intellectual monitoring control system |
| CN108757649B (en) * | 2018-06-12 | 2020-11-10 | 北京理工大学 | Hydraulic oil supply system of machine tool for rolling and strengthening surface of torsion shaft |
| CN109707685B (en) * | 2019-01-21 | 2025-02-21 | 黎明液压有限公司 | A multi-cylinder lifting/lowering synchronous digital hydraulic control system |
| CN110217715A (en) * | 2019-06-12 | 2019-09-10 | 石家庄华燕交通科技有限公司 | Electric-control method, motor-driven jack and the terminal device of motor-driven jack |
| CN111101445A (en) * | 2019-12-25 | 2020-05-05 | 河南永智科技有限公司 | Hydraulic system for intelligent prestress tensioning equipment and synchronous tensioning method thereof |
| CN113235939B (en) * | 2021-05-21 | 2022-07-22 | 中冶建筑研究总院有限公司 | Force and displacement double-control pre-stress tensioning equipment combining hydraulic sensing and flow acquisition |
| CN114321035B (en) * | 2021-12-29 | 2024-09-10 | 筑友智造智能科技有限公司 | Intelligent tensioning equipment for prestressed steel bars |
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| DE102008032881B3 (en) * | 2008-07-14 | 2009-11-12 | Dywidag-Systems International Gmbh | Apparatus and method for controlling a tensioning press when tensioning a tendon |
| CN102031874B (en) * | 2010-11-24 | 2012-05-30 | 湖南联智桥隧技术有限公司 | Intelligent type synchronous prestress tensioning system |
| CN103147399B (en) * | 2013-02-07 | 2015-06-17 | 柳州市邱姆预应力机械有限公司 | Intelligent prestressing force stretching 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 |
| CN103982476B (en) * | 2014-05-27 | 2016-02-10 | 湖南联智桥隧技术有限公司 | A kind of hydraulic control circuit |
| CN204140533U (en) * | 2014-10-14 | 2015-02-04 | 湖南联智桥隧技术有限公司 | Prestressing force intelligent tensioning hydraulic system and prestress tensioning equipment |
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