CN106908313B - The small load control system of big load testing machine and control method - Google Patents
The small load control system of big load testing machine and control method Download PDFInfo
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- CN106908313B CN106908313B CN201710243071.8A CN201710243071A CN106908313B CN 106908313 B CN106908313 B CN 106908313B CN 201710243071 A CN201710243071 A CN 201710243071A CN 106908313 B CN106908313 B CN 106908313B
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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
- G01N3/02—Details
Abstract
The invention discloses a kind of small load control system of big load testing machine and control method, which includes small load charger and small load control system；The small load charger includes making the spring-feel mechanism that moving cell upper grip is connect with big load testing machine, the test specimen being connect with spring-feel mechanism, and the small-load sensor connecting with test specimen, small-load sensor are mounted on big load testing machine and make under moving cell on collet；The small load control system includes controller, host computer connected to the controller and simulation imput device and simulation output equipment；By the small load charger in a set of outside and control system, realize that small load accurately controls using the Bit andits control function of big load testing machine；The present invention is used to improve the small load control precision of big load testing machine, expands application range and versatility, reduces equipment investment.
Description
Technical field
The present invention relates to a kind of small load control technologies of testing machine, and in particular to a kind of small load of big load testing machine
Control system and control method.
Background technique
Hydraulic servo testing machine is commonly used in big load experimental test, is unable to satisfy small sample and low modulus (such as rubber, life
Object material) small load (< 1%FS) precise measurement and demand for control in experimental test.
Summary of the invention
In order to overcome the above-mentioned problems of the prior art, the purpose of the present invention is to provide a kind of big load testing machine is micro-
Side crops industry control system and control method, the precise displacement control function based on testing machine pass through testing machine and external small load
The small load closed-loop control of lotus control system Collaborative Control realization big load testing machine.
In order to achieve the above object, the present invention adopts the following technical scheme:
A kind of small load control system of big load testing machine, including small load charger and small load control system
System；The small load charger includes making the spring-feel mechanism that moving cell upper grip is connect with big load testing machine, with
The test specimen of spring-feel mechanism connection, and the small-load sensor connecting with test specimen, small-load sensor are mounted on big load
Testing machine is made under moving cell on collet；The small load control system include controller, host computer connected to the controller with
And simulation imput device and simulation output equipment；Small load charger is defeated by big load testing machine by spring-feel mechanism
Displacement out is converted to small load and is applied to test specimen, and test specimen is forced through small-load sensor measurement；Big load testing machine is logical
External interface is crossed to connect with the controller of small load control system；The host computer of small load control system joins control setting
Number i.e. loading mode, loading force, loading velocity is sent to controller, and controller passes through the first simulation input of simulation imput device
The displacement signal of port processing big load testing machine controller output, is adopted by the second simulation input port of simulation imput device
Collect the small load signal of test specimen that small-load sensor measures in small load charger, displacement and load signal are as feedback
Amount is sent into controller, and control amount is small load, command displacement is calculated using closed loop control algorithm, through simulation output equipment
Simulation output port, which exports and is sent into big load testing machine controller, carries out Bit andits control；Pass through big load testing machine and small load
The small load closed-loop control of lotus control system Collaborative Control realization big load testing machine.
The specific structure of the small load charger are as follows: connect including making moving cell upper grip with big load testing machine
Upper fixture 1, guide rod 2 and upper fixture 1 connect using piston guide mode, and loading spring 3 is mounted on guide rod 2, guiding
2 lower end of bar is connected through a screw thread with upper platen 5, and guide rod 2 prevents spring unstability for guaranteeing that loading spring 3 axially deforms
And bias；Limit switch 4 is mounted on 5 upper surface of platen, compresses position limitation protection for loading spring 3；Further include and big load
The lower fixture 9 that collet connects under testing machine, small-load sensor 8 are mounted on lower fixture 9, and pressing disc 7 is mounted on side crops industry biography
On sensor 8, test specimen 6 is placed between platen 5 and pressing disc 7；Big load testing machine actuation displacement is passed to by upper fixture 1 to be added
Spring 3 is carried, 3 compressive deformation of loading spring generates compressive load and passes to test specimen 6, pressing disc 7 and side crops industry biography by upper platen 5
Sensor 8, each component use cascaded structure, big load testing machine compression-loaded spring 3 generate load equivalence pass to test specimen 6 and
Small-load sensor 8.
The control method of the small load control system of big load testing machine, the core of small load control system are
Peripheral control unit, input quantity be program setting target load, feedback quantity be big load testing machine output current displacement and
The current load of small-load sensor measurement, controller calculate Bit andits control amount by closed loop control algorithm and input big load examination
Machine is tested, load deflection push the spring loading mechanism is generated and realizes small loading force closed-loop control output function.
Loading force controls the stiffness K that precision Δ F depends on big load testing machine output displacement precision Δ L and loading spring 3,
That is:
Δ F=Δ L × K
In the case where big load displacement of testing machine controls the enough situations of precision, can be obtained by adjusting 3 stiffness K of loading spring
The load control precision that must be needed.
Host computer will control setup parameter (loading mode, loading force, loading velocity etc.) and be sent to controller；Controller is adopted
Collect the load deflection signal of testing machine output and the load force signal of small-load sensor output, is calculated by closed loop control algorithm
And export control amount；Controller will load data (displacement, power) and be sent to host computer with real-time display and calculate storage.
Compared to the prior art compared with the present invention has following advantage:
1) big load testing machine is difficult to small load and accurately controls, and the present invention uses spring charging device by testing machine
Output displacement is converted to small loading force, and it is rigid depending on testing machine output displacement precision Δ L and spring that loading force controls precision Δ F
Spend K, it may be assumed that
Δ F=Δ L × K
Usually in the case where displacement of testing machine controls the enough situations of precision, the load of needs can be obtained by adjustment spring rigidity
Lotus controls precision；The present invention has preferably control precision compared with big load testing machine directly controls small load manner；
2) the small loading force that the present invention is born using small-load sensor measurement test specimen, range are small with test demand
Loading force matching, has better measurement accuracy compared with the big load sensor of testing machine itself.
3) present invention is calculated using external small load control system by close-loop control mode and Control experiment seat in the plane is moved
Output can adjust control parameter according to specimen stiffness and test demand, have better flexibility and adaptability.
In short, the present invention utilizes the displacement control of testing machine by the small load charger in a set of outside and control system
Function processed realizes that small load accurately controls.Improve big load testing machine small load control precision, expand application range and
Versatility reduces equipment investment.
Detailed description of the invention
Fig. 1 is the functional block diagram of the small load closed-loop control system of big load testing machine of the present invention.
Fig. 2 is small load charger structure chart of the invention.
Fig. 3 is small load control system structure chart of the invention.
Fig. 4 is the control method figure of the small load control system of big load testing machine of the present invention.
Specific embodiment
Structure and working principle of the invention are described in further detail with reference to the accompanying drawing.
As shown in Figure 1, small load charger is turned by the displacement that spring-feel mechanism exports big load testing machine
It is changed to small load and is applied to test specimen, test specimen is forced through small-load sensor measurement.Small load control system is for acquiring
Big load displacement of testing machine and the small load of test specimen calculate simultaneously output closed-loop command displacement amount by closed loop control algorithm.It is big to carry
Lotus testing machine is connected by external interface with small load control system, and small load control system passes through the first analog input end
The displacement signal of mouth acquisition big load testing machine controller output passes through the small load load of the second simulation input port acquisition and fills
Set the small load signal of test specimen of middle small-load sensor measurement.Displacement and load signal are as feedback quantity feeding controller, control
Amount processed is small load, calculates command displacement using closed loop control algorithm, exports through simulation output port and be sent into big load
Testing machine controller carries out Bit andits control.Big load is realized by big load testing machine and small load control system Collaborative Control
The small load closed-loop control of testing machine.
As shown in Fig. 2, the specific structure of small load charger are as follows: including making to press from both sides on moving cell with big load testing machine
The upper fixture 1 of head connection, guide rod 2 are connect with upper fixture 1 using piston guide mode, and loading spring 3 is mounted on guide rod 2
On, 2 lower end of guide rod is connected through a screw thread with upper platen 5, and guide rod 2 prevents bullet for guaranteeing that loading spring 3 axially deforms
Spring unstability and bias；Limit switch 4 is mounted on 5 upper surface of platen, compresses position limitation protection for loading spring 3；Further include with
The lower fixture 9 that collet connects under big load testing machine, small-load sensor 8 are mounted on lower fixture 9, and pressing disc 7 is mounted on small
On load transducer 8, test specimen 6 is placed between platen 5 and pressing disc 7；Big load testing machine actuation displacement is passed by upper fixture 1
Pass loading spring 3,3 compressive deformation of loading spring generates compressive load and passes to test specimen 6, pressing disc 7 and small by upper platen 5
Load transducer 8, each component use cascaded structure, and the load equivalence that big load testing machine compression-loaded spring 3 generates passes to
Test specimen 6 and small-load sensor 8.
As shown in figure 3, small load control system includes host computer, controller, simulation input and simulation output equipment.On
Position machine will control setup parameter (loading mode, loading force, loading velocity etc.) and be sent to controller；Controller acquires big load examination
The load deflection signal of machine output and the load force signal of small-load sensor output are tested, is calculated by closed loop control algorithm and defeated
Control amount out；Controller will load data (displacement, power) and be sent to host computer with real-time display and calculate storage.
As shown in figure 4, the control method of the small load control system of big load testing machine, small load control system
The core of system is peripheral control unit, and input quantity is the target load of program setting, and feedback quantity is working as big load testing machine output
The current load of preceding displacement and small-load sensor measurement, it is defeated that controller by closed loop control algorithm calculates Bit andits control amount
Enter big load testing machine, generates load deflection push the spring loading mechanism and realize small loading force closed-loop control output function.
Claims (3)
1. a kind of small load control system of big load testing machine, it is characterised in that: including small load charger and small
Load control system；The small load charger includes making the spring that moving cell upper grip is connect with big load testing machine to add
Mounted mechanism, the test specimen being connect with spring-feel mechanism, and the small-load sensor being connect with test specimen, small-load sensor installation
Make under moving cell on collet in big load testing machine；The small load control system includes controller, connected to the controller
Host computer and simulation imput device and simulation output equipment；Small load charger passes through spring-feel mechanism for big load
The displacement of testing machine output is converted to small load and is applied to test specimen, and test specimen is forced through small-load sensor measurement；Big load
Testing machine is connected by external interface with the controller of small load control system；The host computer of small load control system will be controlled
Setup parameter, that is, loading mode processed, loading force, loading velocity are sent to controller, and controller passes through the first of simulation imput device
Simulation input port acquires the displacement signal of big load testing machine controller output, defeated by the second simulation of simulation imput device
Inbound port acquires the small load signal of test specimen that small-load sensor measures in small load charger, displacement and load signal
It is sent into controller as feedback quantity, control amount is small load, calculates command displacement using closed loop control algorithm, defeated through simulating
The simulation output port of equipment, which exports and is sent into big load testing machine controller, out carries out Bit andits control；Pass through big load testing machine
The small load closed-loop control of big load testing machine is realized with small load control system Collaborative Control；
The specific structure of the small load charger are as follows: including with big load testing machine make moving cell upper grip connect it is upper
Fixture (1), guide rod (2) are connect with upper fixture (1) using piston guide mode, and loading spring (3) is mounted on guide rod (2)
On, guide rod (2) lower end is connected through a screw thread with upper platen (5), and guide rod (2) is for guaranteeing loading spring (3) along axial change
Shape prevents spring unstability and bias；Limit switch (4) is mounted on platen (5) upper surface, for loading spring (3) compression limit
Position protection；It further include the lower fixture (9) being connect with collet under big load testing machine, small-load sensor (8) is mounted on lower fixture
(9) on, pressing disc (7) is mounted on small-load sensor (8), and test specimen (6) is placed between platen (5) and pressing disc (7)；Greatly
Load testing machine actuation displacement is passed to loading spring (3) by upper fixture (1), and loading spring (3) compressive deformation generates compression
Load passes to test specimen (6), pressing disc (7) and small-load sensor (8) by upper platen (5), and each component uses cascaded structure,
The load equivalence that big load testing machine compression-loaded spring (3) generates passes to test specimen (6) and small-load sensor (8).
2. the control method of the small load control system of big load testing machine described in claim 1, it is characterised in that: small load
The core of lotus control system is peripheral control unit, and input quantity is the target load of program setting, and feedback quantity is big load testing machine
The current load of current displacement and the small-load sensor measurement of output, controller calculate displacement by closed loop control algorithm
Control amount inputs big load testing machine, generates load deflection push the spring loading mechanism and realizes small loading force closed-loop control output work
Energy.
3. control method according to claim 2, it is characterised in that: loading force controls precision Δ F and tries depending on big load
Test the stiffness K of machine output displacement precision Δ L and loading spring (3), it may be assumed that
Δ F=Δ L × K
In the case where big load displacement of testing machine controls the enough situations of precision, can be obtained by adjusting loading spring (3) stiffness K
The load control precision needed.
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| CN106908313B true CN106908313B (en) | 2019-06-04 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107560933A (en) * | 2017-10-25 | 2018-01-09 | 北京富力通达科技有限公司 | A kind of device and method of big load testing machine loading and measurement |
| CN108519438B (en) * | 2018-01-24 | 2021-01-12 | 浙江理工大学 | Axial force high-precision loading device for elastic wave detection |
| CN114252362B (en) * | 2021-12-02 | 2024-03-19 | 北京建筑大学 | Double-shaft loading fretting wear testing machine |
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| CN101337330A (en) * | 2008-08-01 | 2009-01-07 | 东南大学 | Compensation process capable of increasing machine precision of numerical-controlled lathe and magnetic striction compensation mechanism |
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