CN108709813A - A kind of hydrostatic testing machine release speed control system and its control method - Google Patents
A kind of hydrostatic testing machine release speed control system and its control method Download PDFInfo
- Publication number
- CN108709813A CN108709813A CN201810913175.XA CN201810913175A CN108709813A CN 108709813 A CN108709813 A CN 108709813A CN 201810913175 A CN201810913175 A CN 201810913175A CN 108709813 A CN108709813 A CN 108709813A
- Authority
- CN
- China
- Prior art keywords
- piston
- testing machine
- release speed
- hydraulic cylinder
- control system
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
Abstract
The invention discloses a kind of hydrostatic testing machine release speed control systems, it is characterised in that：It includes the off-load buffering hydraulic cylinder being connected with pressure testing equipment, and the off-load buffering hydraulic cylinder is moved by piston changes cylinder body volume；Drive the decelerating motor of the off-load buffering hydraulic the cylinder piston movement；Control the frequency converter of the decelerating motor positive and negative rotation.And a kind of hydrostatic testing machine release method for control speed.The present invention in view of pressure testing overpressure drop with the relationship of filling water volume variation, straight tube, U-tube pressure testing after, the volume by steadily reducing filling water realizes stable release speed.Since the length or diameter of pipe are different, fill the volume of water also can difference, the speed of the volume change of water is filled by control to realize different release speed.Realize release in this way, velocity-stabilization, curve is steady, and the speed of release is controllable.
Description
Technical field
The invention belongs to technical field of test equipment, more particularly to a kind of in straight tube, the pressure testing pressurize knot of U-tube
The hydrostatic testing machine release speed control system and its control method used in stress-relief process after beam.
Background technology
Straight tube, U-tube the unloading valve of pressure testing machine be usually quck-opening valve, unloading valve is beaten after pressure testing pressurize
It opens, pressure quick relief, cannot be satisfied technology requirement of the client to product release speed.To realize that release at a slow speed is usually taken
Depressurized circuit installs the way of damping sheet additional, but this method release can see the speed in release initial stage release from Unloading curve
Quickly, the speed to later stage release is very slow for degree.The bulk velocity of release is undesirable, and the speed of release can not be realized
It adjusts.
Invention content
Present invention aims at the defects that release speed is unable to control for existing pressure relief method, provide a kind of water pressure test
Machine release speed control system and its control method.
The present invention to achieve the above object, adopts the following technical scheme that：
A kind of hydrostatic testing machine release speed control system, it is characterised in that：It includes
The off-load buffering hydraulic cylinder being connected with pressure testing equipment, the off-load buffering hydraulic cylinder is moved by piston changes cylinder body appearance
Product；
Drive the decelerating motor of the off-load buffering hydraulic the cylinder piston movement；
Control the frequency converter of the decelerating motor positive and negative rotation.
It is further characterized by：It is provided with unloading control on pipeline between the pressure testing equipment and buffering hydraulic cylinder
Valve.
Further：The frequency converter controls its output frequency by an external potentiometer.
Preferably：The worm screw phase that the piston of the off-load buffering hydraulic cylinder passes through a shaft coupling and a worm gear device
Connection；The reducing motor output shaft is connected by a shaft coupling with the worm gear of the worm gear device.
Limit switches are arranged in the off-load buffering hydraulic cylinder casing wall piston-initial-position and final position, and the limit is opened
Pass is connected with the frequency converter, is automatically stopped and automatically resets for controlling piston.
The off-load buffering hydraulic cylinder is molten stainless steel cylinder pressure, and magnet ring is carried on piston；The limit switch is opened for magnetism
It closes.
A kind of control method of above-mentioned hydrostatic testing machine release speed control system, it is characterised in that including following steps
Suddenly：
（1）After pressure testing equipment pressurize, unloading control valve is opened, and decelerating motor starts to rotate forward, and drives off-load buffering hydraulic
The piston of cylinder is moved to the left, and for the filling flow in pressurize pipeline into off-load buffering hydraulic cylinder, the pressure in pressurize pipeline is gradual
Reduce；
（2）When the release that pressurize pipeline inner pressure is reduced to setting terminates pressure value, decelerating motor starts to be driven reverse off-load
The piston of buffering hydraulic cylinder returns to the right initial position, after the magnetic switch of initial position senses piston in place, slows down
Motor is stopped.
It is further characterized by：The output frequency that frequency converter is adjusted by potentiometer controls release speed.
Relationship with filling water volume variation drops in view of pressure testing overpressure in the present invention, is tried in the pressure of straight tube, U-tube
After testing, stable release speed is realized by steadily reducing the volume of filling water.Due to pipe length or diameter not
Together, fill the volume of water also can difference, the speed of the volume change of water is filled by control to realize different release speed
Degree.Realize release in this way, velocity-stabilization, curve is steady, and the speed of release is controllable.
Description of the drawings
Fig. 1 is principle of the invention block schematic illustration.
Specific implementation mode
As shown in Figure 1, a kind of hydrostatic testing machine release speed control system, includes that the off-load being connected with pressure testing equipment 10 is delayed
Fliud flushing cylinder pressure 4, off-load buffering hydraulic cylinder 4 is moved by piston changes cylinder body volume.Between pressure testing equipment 10 and buffering hydraulic cylinder 4
Pipeline on be provided with unloading control valve 1.It is closed in pressure testing packing stage unloading control valve 1, ensures packing stage pressure
Stabilization, avoid because in off-load buffering hydraulic cylinder 4 leakage cause pressure difference excessive.Unloading control valve is made a call to 1 and is opened at the end of pressurize, starts
Release.The piston of off-load buffering hydraulic cylinder 4 is moved left and right by the driving of decelerating motor 5.Decelerating motor 5 is controlled by frequency converter 7
Positive and negative rotation, frequency converter 7 control its output voltage by an external potentiometer 8 on operation panel 9.
Preferably：The worm screw phase that the piston of off-load buffering hydraulic cylinder 4 passes through a shaft coupling 3 and a worm gear device 2
Connection；5 output shaft of decelerating motor is connected by a shaft coupling 3 with the worm gear of worm gear device 2.
Off-load buffering hydraulic cylinder 4 is molten stainless steel cylinder pressure, and magnet ring is carried on piston；It lives in 4 casing wall of off-load buffering hydraulic cylinder
It fills in initial position and magnetic switch 6 is arranged in final position.Magnetic switch 6 is connected with frequency converter 7, is automatically stopped for controlling piston
With automatically reset.
Above-mentioned hydrostatic testing machine release speed control system after U-tube pressurize, open, frequency conversion by unloading control valve 1
Device 7 controls decelerating motor 5 and starts to rotate forward, and the piston of driving off-load buffering hydraulic cylinder 4 is moved to the left, in U-tube and pressurize pipeline
Filling flow into off-load buffering hydraulic cylinder 4, the pressure in pipe is gradually reduced, when overpressure is reduced to the release knot of setting
When beam pressure force value, the piston that decelerating motor 5 starts to be driven reverse off-load buffering hydraulic cylinder 4 returns to the right initial position, originally
After the magnetic switch 6 of beginning position senses piston in place, decelerating motor 5 is stopped.Whole work process is performed fully automatic, by
Electric signal is supplied to frequency converter 7 to control the working condition that 5 forward, reverse or stop of decelerating motor stop.
The adjusting of release speed is realized by changing the rotating speed of decelerating motor 5.The side that frequency converter 7 passes through analog input
Formula is come the rotating speed of the decelerating motor 5 controlled.Concrete operations are the potentiometers 8 installed additional on the operation panel 9 by equipment,
The release speed of needs is determined by the knob of operating personnel's adjusting potentiometer 8, it is simple and quick.
The Unloading curve that the U-tube of release obtains in this way is stable and slope is controllable.Solves U-tube well
The problem of pressurize terminates to cannot achieve release at a slow speed.Meanwhile it being inputted by sensor electric signal and realizing fully automatic operation.Operation
Potentiometer adjusting control release speed on panel, it is easy to operate, efficiently reduce what operating personnel spent in operation equipment
Time.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitute or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (8)
1. a kind of hydrostatic testing machine release speed control system, it is characterised in that：It includes
The off-load buffering hydraulic cylinder being connected with pressure testing equipment, the off-load buffering hydraulic cylinder is moved by piston changes cylinder body appearance
Product；
Drive the decelerating motor of the off-load buffering hydraulic the cylinder piston movement；
Control the frequency converter of the decelerating motor positive and negative rotation.
2. hydrostatic testing machine release speed control system as described in claim 1, it is characterised in that：The pressure testing equipment is gentle
Unloading control valve is provided on pipeline between fliud flushing cylinder pressure.
3. hydrostatic testing machine release speed control system as claimed in claim 1 or 2, it is characterised in that：The frequency converter is logical
It crosses an external potentiometer and controls its output frequency.
4. hydrostatic testing machine release speed control system as claimed in claim 1 or 2, it is characterised in that：The off-load buffering
The piston of hydraulic cylinder is connected by a shaft coupling with the worm screw of a worm gear device；The reducing motor output shaft passes through
One shaft coupling is connected with the worm gear of the worm gear device.
5. hydrostatic testing machine release speed control system as claimed in claim 1 or 2, it is characterised in that：The off-load buffering
Limit switches are arranged in hydraulic cylinder casing wall piston-initial-position and final position, and the limit switch is connected with the frequency converter,
It is automatically stopped and automatically resets for controlling piston.
6. hydrostatic testing machine release speed control system as claimed in claim 5, it is characterised in that：The off-load buffering hydraulic
Cylinder is molten stainless steel cylinder pressure, and magnet ring is carried on piston；The limit switch is magnetic switch.
7. a kind of control method of hydrostatic testing machine release speed control system as described in claim 1-6, it is characterised in that
Include the following steps：
（1）After pressure testing equipment pressurize, unloading control valve is opened, and decelerating motor starts to rotate forward, and drives off-load buffering hydraulic
The piston of cylinder is moved to the left, and for the filling flow in pressurize pipeline into off-load buffering hydraulic cylinder, the pressure in pressurize pipeline is gradual
Reduce；
（2）When the release that pressurize pipeline inner pressure is reduced to setting terminates pressure value, decelerating motor starts to be driven reverse off-load
The piston of buffering hydraulic cylinder returns to the right initial position, after the magnetic switch of initial position senses piston in place, slows down
Motor is stopped.
8. the control method of hydrostatic testing machine release speed control system as claimed in claim 7, it is characterised in that：Pass through electricity
Position device adjusts the output voltage control release speed of frequency converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810913175.XA CN108709813A (en) | 2018-08-13 | 2018-08-13 | A kind of hydrostatic testing machine release speed control system and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810913175.XA CN108709813A (en) | 2018-08-13 | 2018-08-13 | A kind of hydrostatic testing machine release speed control system and its control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108709813A true CN108709813A (en) | 2018-10-26 |
Family
ID=63875668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810913175.XA Pending CN108709813A (en) | 2018-08-13 | 2018-08-13 | A kind of hydrostatic testing machine release speed control system and its control method |
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| CN (1) | CN108709813A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101655113A (en) * | 2009-09-09 | 2010-02-24 | 吴言武 | Hydraulic driving device with pressure pre-releasing loop |
| CN101995354A (en) * | 2009-08-27 | 2011-03-30 | 宝山钢铁股份有限公司 | Water pressure testing machine pressure balancing device and control method thereof |
| CN105034443A (en) * | 2015-08-14 | 2015-11-11 | 中山市八达机器制造有限公司 | Pressure maintaining and pressure unloading stabilization ultralow speed oil press |
| CN208399278U (en) * | 2018-08-13 | 2019-01-18 | 宝银特种钢管有限公司 | A kind of hydrostatic testing machine release speed control system |
-
2018
- 2018-08-13 CN CN201810913175.XA patent/CN108709813A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995354A (en) * | 2009-08-27 | 2011-03-30 | 宝山钢铁股份有限公司 | Water pressure testing machine pressure balancing device and control method thereof |
| CN101655113A (en) * | 2009-09-09 | 2010-02-24 | 吴言武 | Hydraulic driving device with pressure pre-releasing loop |
| CN105034443A (en) * | 2015-08-14 | 2015-11-11 | 中山市八达机器制造有限公司 | Pressure maintaining and pressure unloading stabilization ultralow speed oil press |
| CN208399278U (en) * | 2018-08-13 | 2019-01-18 | 宝银特种钢管有限公司 | A kind of hydrostatic testing machine release speed control system |
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