CN101692027A - Universal material testing machine for variable rotating speed pump control hydraulic servo loading system - Google Patents
Universal material testing machine for variable rotating speed pump control hydraulic servo loading system Download PDFInfo
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- CN101692027A CN101692027A CN200910072746A CN200910072746A CN101692027A CN 101692027 A CN101692027 A CN 101692027A CN 200910072746 A CN200910072746 A CN 200910072746A CN 200910072746 A CN200910072746 A CN 200910072746A CN 101692027 A CN101692027 A CN 101692027A
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Abstract
The invention relates to a universal material testing machine for a variable rotating speed pump control hydraulic servo loading system, belonging to the field of the material mechanics performance testing equipment, and aiming at solving the problems that the prior hydraulic universal material testing machine which adopts an electro-hydraulic proportional valve as a control system has higher fault rate because the electro-hydraulic proportional valve is sensitive to the oil contamination. The variable rotating speed pump control hydraulic servo loading system is internally arranged below a working platform; a motor is driven by a driver to do rotating movement at variable rotating speed so as to control the pressure and the flow direction of the oil in the outlet of a bidirectional constant flow pump which is connected with the output shaft of the motor and push a hydraulic oil cylinder to do upward loading movement or downward loading movement; the pressure, the displacement and the deformation are transmitted to a control computer by a pressure sensor, a placement sensor and an extensormeter; a control signal is transmitted to the driver by the control computer to realize the closed loop control; and the rotating speed of the motor is transmitted to the driver by a coder to form the inner loop feedback control. The universal material testing machine is used as the metal and nonmetal material mechanics performance testing equipment.
Description
Technical field
The present invention relates to a kind of universal testing machine of variable speed pump control hydraulic servo loading system, belong to material mechanical performance testing apparatus field.
Background technology
Material Testing Machine is the equipment of Mechanics Performance Testings such as a kind of stretching that is applicable to metal, nonmetallic materials, compression, bending, shearing, fatigue and analysis.The hydraulic universal testing machine integral frame of existing main flow as shown in Figure 4, its hydraulic circuit as shown in Figure 3, this hydraulic universal testing machine adopts independent pumping plant as hydraulic oil source, the volume of common independent pumping plant is 1m
3More than, this increases the volume of system, and the complexity of system improves, cost strengthens, required pressure when keeping system works simultaneously, and the running that pumping plant need not stop can cause bigger energy dissipation; This hydraulic universal testing machine adopts electro-hydraulic proportional valve as control gear, control the flow and the flow direction of the fluid that enters hydraulic jack, because electro-hydraulic proportional valve is responsive especially to the pollution of fluid, the increase of oil contamination granularity causes the catching phenomenon of electro-hydraulic proportional valve easily, cause the failure rate height of universal testing machine, and electro-hydraulic proportional valve only can provide the maximum load pressure of oil supply pressure 2/3rds, causes serious energy dissipation.
Summary of the invention
The objective of the invention is to adopt electro-hydraulic proportional valve as control gear in order to solve existing hydraulic universal testing machine, owing to electro-hydraulic proportional valve to the high problem of complete machine failure rate that the pollution sensibility of fluid produces, a kind of universal testing machine of variable speed pump control hydraulic servo loading system is provided.
The present invention includes entablature, sill, two root posts, worktable, clamp system and extensometer, two root posts and entablature and sill form a framework, it also comprises two hydraulic jacks, enclosed oil tank, driver, motor, two-way fixed displacement pump, Fill valve, two-way locking-valve, two surplus valves, scrambler, displacement transducer, pressure transducer and control computer
The power output shaft of motor is connected with the power input shaft of two-way fixed displacement pump, form closed circuit by two oil circuits between two-way fixed displacement pump and two hydraulic jacks, article one, an end of oil circuit connects the epicoele of two hydraulic jacks simultaneously, one end of another oil circuit connects the cavity of resorption of two hydraulic jacks simultaneously, on described two oil circuits two-way locking-valve is set, two oil-outs of Fill valve by Fill valve are communicated between two oil circuits between two-way locking-valve and the two-way fixed displacement pump, and the oil-in of Fill valve is communicated with the oil inlet and outlet of enclosed oil tank; Oil-in and the oil-out of each surplus valve by surplus valve is communicated between two oil circuits between two-way locking-valve and two hydraulic jacks, and the overflow direction of two surplus valves is opposite;
The through hole that one end of the piston rod of each hydraulic jack passes on the sill connects worktable, clamp system is positioned at described framework and fixedlys connected with entablature, pressure transducer is set on the clamp system, and the pressure signal output terminal of pressure transducer connects the pressure signal input end of control computer; The other end of the piston rod of a hydraulic jack is connected with the displacement signal input end of displacement transducer, the displacement signal output terminal of displacement transducer connects the displacement signal input end of control computer, the input rotating shaft of scrambler links to each other with the power output shaft of motor, and the detection signal output terminal of scrambler connects the feedback signal input end of driver; The signal input end of driver connects the control signal output ends of control computer, and the control signal output ends of driver connects the signal input end of motor, and the deformation signal output terminal of extensometer connects the deformation signal input end of control computer.
Advantage of the present invention is:
The present invention adopts the variable speed pump control hydraulic servo loading system as control gear, thereby control turning to of motor by driver and make the clockwise or counterclockwise variable speed rotation of two-way fixed displacement pump with rotating speed, drive hydraulic jack and carry out work, removed extremely responsive electro-hydraulic proportional valve of oil contamination and the solenoid directional control valve that breaks down easily, simplified hydraulic circuit, reduced the probability that breaks down, it is also very convenient to safeguard; Because the integrated degree height of variable speed pump control hydraulic servo loading system, the required fluid of system is compared with traditional electro-hydraulic servo testing machine and is significantly reduced, saved jumbo fuel tank, reduced the floor area of whole test machine, and reduced the complexity of whole test machine system, reduce cost, had the value of environmental protection; Variable speed pump control hydraulic servo loading system efficient height, the energy utilization ratio height, so its operating cost is lower, energy-saving effect is splendid; Control system of the present invention is because existing interior ring motor speed is controlled, again outer ring compression, displacement, deformation FEEDBACK CONTROL arranged, and the loading accuracy of machine system has reached very high level.The effect of two-way locking-valve is to keep existing invariant position when hydraulic jack is quit work, and two surplus valves are used for the protection to machine system, it can prevent that test specimen from being broken or situation such as backfin when taking place system occur unexpected.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present invention, Fig. 2 is the hydraulic circuit schematic diagram of variable speed pump control hydraulic servo loading system, Fig. 3 is the hydraulic circuit schematic diagram of existing hydraulic universal testing machine, and Fig. 4 is the general structure block diagram of existing hydraulic universal testing machine.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1 and Fig. 2, present embodiment comprises entablature 1, sill 2, two root posts 3, worktable 4, clamp system 5 and extensometer 18, two root posts 3 form a framework with entablature 1 and sill 2, framework is supported by the support and the support of complete machine, it also comprises two hydraulic jacks 6, enclosed oil tank 7, driver 8, motor 9, two-way fixed displacement pump 10, Fill valve 11, two-way locking-valve 12, two surplus valves 13, scrambler 14, displacement transducer 15, pressure transducer 16 and control computer 17
The power output shaft of motor 9 is connected by shaft coupling 19 with the power input shaft of two-way fixed displacement pump 10, form closed circuit by two oil circuits between two-way fixed displacement pump 10 and two hydraulic jacks 6, article one, an end of oil circuit connects the epicoele of two hydraulic jacks 6 simultaneously, one end of another oil circuit connects the cavity of resorption of two hydraulic jacks 6 simultaneously, on described two oil circuits two-way locking-valve 12 is set, two oil-outs of Fill valve 11 by Fill valve 11 are communicated between two oil circuits between two-way locking-valve 12 and the two-way fixed displacement pump 10, and the oil-in of Fill valve 11 is communicated with the oil inlet and outlet of enclosed oil tank 7; Oil-in and the oil-out of each surplus valve 13 by surplus valve 13 is communicated between two oil circuits between two-way locking-valve 12 and two hydraulic jacks 6, and the overflow direction of two surplus valves 13 is opposite;
The through hole that one end of the piston rod of each hydraulic jack 6 passes on the sill 2 connects worktable 4, clamp system 5 is positioned at described framework and fixedlys connected with entablature 1, pressure transducer 16 is set on the clamp system 5, pressure transducer 16 is between entablature 1 and clamp system 5, and the pressure signal output terminal of pressure transducer 16 connects the pressure signal input end of control computer 17; The other end of the piston rod of a hydraulic jack 6 is connected with the displacement signal input end of displacement transducer 15, the displacement signal output terminal of displacement transducer 15 connects the displacement signal input end of control computer 17, the code-disc of scrambler 14 is enclosed within on the power output shaft of motor 9, the input rotating shaft of scrambler 14 links to each other with the power output shaft of motor 9, and the detection signal output terminal of scrambler 14 connects the feedback signal input end of driver 8; The signal input end of driver 8 connects the control signal output ends of control computer 17, the control signal output ends of driver 8 connects the signal input end of motor 9, between clamp system 5 and worktable 4, be installed and go up test specimen to be measured, with the extensometer 18 parallel gauge length two ends that are clamped in sample, the deformation signal output terminal of extensometer 18 connects the deformation signal input end of control computer 17.
Two hydraulic jacks 6 among the present invention, enclosed oil tank 7, motor 9, two-way fixed displacement pump 10, Fill valve 11, two-way locking-valve 12 and two surplus valves 13 are formed the variable speed pump control hydraulic servo loading system, the variable speed pump control hydraulic servo loading system is built in the below of worktable 4, driver 8 is according to the control signal drivers 8 of control computer 17, driver 8 drive motor 9 carry out variable speed, thereby become the pressure and the flow direction that divertical motion is controlled the two-way fixed displacement pump 10 outlet fluid that link to each other with the output shaft of motor 9, promoting two hydraulic jacks, 6 drive worktable 4 draws, press, curved, turn round, material load tests such as fatigue, 14 speed feedback with motor 9 of scrambler are given driver 8.That machine system has is simple and reasonable, measuring accuracy is high, good reliability, easy and simple to handle, good energy-conserving effect, operating cost is low, floor area is little advantage.
The course of work of the present invention: control computer 17 receives after the outside input control signal, pass through analyzing and processing, control signal is passed to driver 8, driver 8 carries out the variable speed rotation according to control signal drive motor 9, then the hydraulic oil that drags the certain flow direction of two-way fixed displacement pump 10 generations, pressure enters into the cavity of resorption or the epicoele of hydraulic jack 6, realization is to the driven in synchronism of two hydraulic jacks 6, the piston rod drive worktable 4 of two hydraulic jacks 6 is gone up or is loaded motion down, realizes the various tests to material.Force value in the pressure transducer 16 test material processs of the test, extensometer 18 is a kind of instruments of measuring test specimen to be measured line distortion between 2 on other objects, deformation quantity in its test material process of the test, the displacement of test specimen in the displacement transducer 15 test material processs of the test, force value, deformation quantity, displacement passes to control computer 17 via signal wire, after the outside input control signal of control computer 17 passes through certain control algolithm, its result passes to driver 8 as control signal, realize the closed-loop control of whole process, reached high-precision test performance.Scrambler 14 passes to driver 8 with the rotating speed of motor 9, forms the interior ring speed feedback control of system, makes the control accuracy of Material Testing Machine reach higher level.
Embodiment two: the difference of present embodiment and embodiment one is that described Fill valve 11 is made up of two hydraulic control one-way valves, two hydraulic control one-way valves are parallel between two oil circuits, and the oil-in of two hydraulic control one-way valves is communicated with the oil inlet and outlet of enclosed oil tank 7 simultaneously.Other composition and annexation are identical with embodiment one.
The oil-out of described each hydraulic control one-way valve connects with different oil circuit respectively, and the control port of each hydraulic control one-way valve is connected with the oil circuit that oil-out was connected of another hydraulic control one-way valve respectively.
Embodiment three: present embodiment and embodiment one or twos' difference is that described two-way locking-valve 12 is made up of two hydraulic control one-way valves.Other composition and annexation are identical with embodiment one or two.
The oil-out of two hydraulic control one-way valves described in the present embodiment is connected with two different hydraulic fluid ports of hydraulic jack 6 respectively, the oil-in of two hydraulic control one-way valves is connected with two different hydraulic fluid ports of two-way fixed displacement pump 10 respectively, and the control port of each hydraulic control one-way valve is connected with the oil circuit that oil-in was connected of another hydraulic control one-way valve respectively.When the effect of two-way locking-valve 12 is off working state hydraulic jack 6 is carried out pressurize, the piston rod that prevents hydraulic jack 6 then is because of action of gravity and to lower slider.
Claims (3)
1. the universal testing machine of a variable speed pump control hydraulic servo loading system, it comprises entablature (1), sill (2), two root posts (3), worktable (4), clamp system (5) and extensometer (18), two root posts (3) form a framework with entablature (1) and sill (2), it is characterized in that: it also comprises two hydraulic jacks (6), enclosed oil tank (7), driver (8), motor (9), two-way fixed displacement pump (10), Fill valve (11), two-way locking-valve (12), two surplus valves (13), scrambler (14), displacement transducer (15), pressure transducer (16) and control computer (17)
The power output shaft of motor (9) is connected with the power input shaft of two-way fixed displacement pump (10), form closed circuit by two oil circuits between two-way fixed displacement pump (10) and two hydraulic jacks (6), article one, an end of oil circuit connects the epicoele of two hydraulic jacks (6) simultaneously, one end of another oil circuit connects the cavity of resorption of two hydraulic jacks (6) simultaneously, on described two oil circuits two-way locking-valve (12) is set, two oil-outs of Fill valve (11) by Fill valve (11) are communicated between two oil circuits between two-way locking-valve (12) and the two-way fixed displacement pump (10), and the oil-in of Fill valve (11) is communicated with the oil inlet and outlet of enclosed oil tank (7); Oil-in and the oil-out of each surplus valve (13) by surplus valve (13) is communicated between two oil circuits between two-way locking-valve (12) and two hydraulic jacks (6), and the overflow direction of two surplus valves (13) is opposite;
The through hole that one end of the piston rod of each hydraulic jack (6) passes on the sill (2) connects worktable (4), clamp system (5) is positioned at described framework and fixedlys connected with entablature (1), pressure transducer (16) is set on the clamp system (5), and the pressure signal output terminal of pressure transducer (16) connects the pressure signal input end of control computer (17); The other end of the piston rod of a hydraulic jack (6) is connected with the displacement signal input end of displacement transducer (15), the displacement signal output terminal of displacement transducer (15) connects the displacement signal input end of control computer (17), the input rotating shaft of scrambler (14) links to each other with the power output shaft of motor (9), and the detection signal output terminal of scrambler (14) connects the feedback signal input end of driver (8); The signal input end of driver (8) connects the control signal output ends of control computer (17), the control signal output ends of driver (8) connects the signal input end of motor (9), and the deformation signal output terminal of extensometer (18) connects the deformation signal input end of control computer (17).
2. the universal testing machine of variable speed pump control hydraulic servo loading system according to claim 1, it is characterized in that described Fill valve (11) is made up of two hydraulic control one-way valves, two hydraulic control one-way valves are parallel between two oil circuits, and the oil-in of two hydraulic control one-way valves is communicated with the oil inlet and outlet of enclosed oil tank (7) simultaneously.
3. the universal testing machine of variable speed pump control hydraulic servo loading system according to claim 1 and 2 is characterized in that described two-way locking-valve (12) is made up of two hydraulic control one-way valves.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100727462A CN101692027B (en) | 2009-08-27 | 2009-08-27 | Universal material testing machine for variable rotating speed pump control hydraulic servo loading system |
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| CN2009100727462A CN101692027B (en) | 2009-08-27 | 2009-08-27 | Universal material testing machine for variable rotating speed pump control hydraulic servo loading system |
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| CN101692027B CN101692027B (en) | 2011-05-11 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957286A (en) * | 2010-04-16 | 2011-01-26 | 江苏大学 | Novel material testing machine |
| CN102589980A (en) * | 2012-01-17 | 2012-07-18 | 中国地震局地质研究所 | Biaxial loading system in complex dynamic process |
| CN102635599A (en) * | 2012-03-28 | 2012-08-15 | 济南东测试验机技术有限公司 | Hydraulic system of integrated servo pump station of testing machine |
| CN103135512A (en) * | 2011-12-02 | 2013-06-05 | 中铁隧道集团有限公司 | Shield electro-hydraulic control system comprehensive test platform |
| CN104458423A (en) * | 2014-12-24 | 2015-03-25 | 黑龙江省木材科学研究所 | 50-ton closed loop measurement and control wood tensile test device |
| CN105874218A (en) * | 2013-11-05 | 2016-08-17 | 伊顿公司 | High output hydraulic cylinder and piston arrangement |
| CN106678130A (en) * | 2017-02-16 | 2017-05-17 | 数源科技股份有限公司 | Closed type variable rotating speed pump controlled hydraulic system of installing equipment of pure electric compression type garbage truck |
| CN106763006A (en) * | 2016-11-23 | 2017-05-31 | 南京航空航天大学 | A kind of control method of hydraulic servo driving system |
| CN107524649A (en) * | 2017-10-25 | 2017-12-29 | 北京富力通达科技有限公司 | The device and control method that a kind of hydraulic servo oil cylinder synchronously loads |
| CN107560942A (en) * | 2017-07-06 | 2018-01-09 | 盐城新奥燃气有限公司 | A kind of strength testing device of gas cylinder mounting bracket |
| CN107584000A (en) * | 2017-10-17 | 2018-01-16 | 柳州北斗星液压科技有限公司 | Multi-pass pipe forming system and method |
| CN108825565A (en) * | 2018-08-16 | 2018-11-16 | 西南科技大学 | A kind of Integral hydraulic driving device with accumulator |
| CN109798270A (en) * | 2019-02-25 | 2019-05-24 | 哈尔滨工业大学 | Multi-modal energy-saving servo actuator and the multi-modal energy-efficient method of realization |
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2009
- 2009-08-27 CN CN2009100727462A patent/CN101692027B/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957286B (en) * | 2010-04-16 | 2012-07-04 | 江苏大学 | Novel material testing machine |
| CN101957286A (en) * | 2010-04-16 | 2011-01-26 | 江苏大学 | Novel material testing machine |
| CN103135512A (en) * | 2011-12-02 | 2013-06-05 | 中铁隧道集团有限公司 | Shield electro-hydraulic control system comprehensive test platform |
| CN103135512B (en) * | 2011-12-02 | 2015-10-21 | 中铁隧道集团有限公司 | Shield structure electro-hydraulic control system comprehensive test platform |
| CN102589980A (en) * | 2012-01-17 | 2012-07-18 | 中国地震局地质研究所 | Biaxial loading system in complex dynamic process |
| CN102635599A (en) * | 2012-03-28 | 2012-08-15 | 济南东测试验机技术有限公司 | Hydraulic system of integrated servo pump station of testing machine |
| CN105874218A (en) * | 2013-11-05 | 2016-08-17 | 伊顿公司 | High output hydraulic cylinder and piston arrangement |
| CN104458423A (en) * | 2014-12-24 | 2015-03-25 | 黑龙江省木材科学研究所 | 50-ton closed loop measurement and control wood tensile test device |
| CN106763006A (en) * | 2016-11-23 | 2017-05-31 | 南京航空航天大学 | A kind of control method of hydraulic servo driving system |
| CN106678130A (en) * | 2017-02-16 | 2017-05-17 | 数源科技股份有限公司 | Closed type variable rotating speed pump controlled hydraulic system of installing equipment of pure electric compression type garbage truck |
| CN107560942A (en) * | 2017-07-06 | 2018-01-09 | 盐城新奥燃气有限公司 | A kind of strength testing device of gas cylinder mounting bracket |
| CN107560942B (en) * | 2017-07-06 | 2020-05-12 | 盐城新奥燃气有限公司 | Strength testing device of gas cylinder mounting bracket |
| CN107584000A (en) * | 2017-10-17 | 2018-01-16 | 柳州北斗星液压科技有限公司 | Multi-pass pipe forming system and method |
| CN107524649A (en) * | 2017-10-25 | 2017-12-29 | 北京富力通达科技有限公司 | The device and control method that a kind of hydraulic servo oil cylinder synchronously loads |
| CN108825565A (en) * | 2018-08-16 | 2018-11-16 | 西南科技大学 | A kind of Integral hydraulic driving device with accumulator |
| CN109798270A (en) * | 2019-02-25 | 2019-05-24 | 哈尔滨工业大学 | Multi-modal energy-saving servo actuator and the multi-modal energy-efficient method of realization |
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| CN101692027B (en) | 2011-05-11 |
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