CN106323765B - Hollow cylinder anisotropy tester for granular material - Google Patents
Hollow cylinder anisotropy tester for granular material Download PDFInfo
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- CN106323765B CN106323765B CN201610726916.4A CN201610726916A CN106323765B CN 106323765 B CN106323765 B CN 106323765B CN 201610726916 A CN201610726916 A CN 201610726916A CN 106323765 B CN106323765 B CN 106323765B
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- 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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
Abstract
The invention provides a hollow cylinder anisotropy tester for granular materials, which comprises an air pressure source, air pressure control systems, air cylinder force transmission systems, confining pressure chambers, volume variable measurement systems and data acquisition systems, wherein the signal output ends of four groups of air pressure control systems, air cylinder force transmission systems and volume variable measurement systems are respectively connected with the data acquisition systems for transmitting analog signals, the air inlet ends of the four groups of air pressure control systems are respectively connected with the air pressure source, the air outlet ends of two groups of air pressure control systems are respectively connected with the connecting ends of the air cylinder force transmission systems, and the output ends of the air cylinder force transmission systems and the air outlet ends of the other two groups of air pressure control systems are connected with the confining pressure chambers. The invention realizes the coupling loading of four parameters of axial force, torque and internal and external circumferential pressure of the granular material in the shearing process, is suitable for the tests of directional shearing, main stress axis rotation and the like of the granular material, can be used for researching the influence of the anisotropy of the granular material on the mechanical properties of the granular material, and provides design basis and technical support for related engineering projects.
Description
Technical Field
The invention relates to an instrument in the technical field of testing of granular materials, in particular to a hollow cylinder anisotropy tester for granular materials.
Background
Many particulate materials exist in nature, such as sand, gravel and the like, and anisotropy is one of the basic properties of these particulate materials, which has been the subject of intensive research on the stress-strain relationship of the particulate materials. The particle material in engineering usually encounters dynamic engineering loads such as wave load and traffic load, the change of the main stress axis direction is the main characteristic of the stress path borne by the particle material under the action of the dynamic loads, and the main stress axis direction just reflects the property of anisotropy of the particle material. Therefore, it is important to study the influence of the dynamic engineering load on the mechanical properties of the granular material and to improve the engineering design precision, and to study the anisotropy of the granular material deeply.
However, the conventional dynamic triaxial apparatus generally can only adopt a form of controlling three main stress directions to be fixed and large main stress to be changed repeatedly in the test process. If the sample is a hollow cylinder, the complex stress state can be simulated by controlling four loading parameters of axial force, torque, internal confining pressure and peripheral pressure, so that the direction of a main stress axis is changed. The traditional hollow cylinder torsional shear apparatus adopts a hollow cylinder sample, but the internal and external pressures of the sample need to be adjusted in advance before the sample shear starts, the internal and external pressures are kept unchanged in the shearing process, and the axial force and the torque are loaded in a coupling manner, so that the requirement of the main stress axis rotation theory cannot be strictly met. In order to research the influence of the anisotropy of the granular material on the strength and deformation of the granular material, the control of any angle of a main stress axis must be realized in a test experiment, so that a test instrument is required to realize independent and continuous control of four loading parameters of axial force, torque, internal confining pressure and external confining pressure in the shearing process of the granular material.
For the prior art literature search, no relevant description of an anisotropy tester for automatically and continuously loading four parameters of axial force, torque and internal and external circumferential pressure of a particle material at the same time is found.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a hollow cylinder anisotropy tester for granular materials, which realizes automatic continuous loading of four parameters, namely axial force, torque and internal and external ambient pressure in the whole process of testing the hollow cylinder granular materials, is suitable for tests of directional shearing, main stress axis rotation and the like of the granular materials, aims to change the fact that the existing test instrument cannot independently control the automatic continuous loading of the four loading parameters, namely axial force, torque and internal and external ambient pressure at the same time, can be used for researching the influence of anisotropy of the granular materials on the physical and mechanical properties of the granular materials, and provides design basis and technical support for related engineering projects.
To achieve the above object, the present invention provides a hollow cylinder anisotropy tester for particulate materials, comprising: atmospheric pressure source, four groups of pneumatics control system, cylinder force transmission system, confined chamber, volume variable measurement system and data acquisition system, wherein:
the confining pressure chamber is used for installing a granular material sample and structurally comprises an inner cavity and an outer cavity, water is injected until the liquid level is higher than the sample during a test, and the inner cavity and the outer cavity apply hydrostatic pressure through an inner confining pressure control system and an outer confining pressure control system respectively;
the air pressure control system comprises four groups, namely an axial force air pressure control system, a torque air pressure control system, an inner surrounding pressure air pressure control system and an outer surrounding pressure air pressure control system, wherein the air inlet ends of the four groups of air pressure control systems are connected with the air pressure source, the air outlet ends of the axial force air pressure control system and the torque air pressure control system are respectively connected with the access end of the air cylinder force transmission system, and the air outlet ends of the inner surrounding pressure air pressure control system and the outer surrounding pressure air pressure control system are respectively connected with the inner cavity and the outer cavity of the surrounding pressure chamber;
the output end of the cylinder force transmission system is connected with the confining pressure chamber;
the volume variable measuring system is connected with the confining pressure chamber;
the signal output ends of the four groups of air pressure control systems, the air cylinder force transmission system and the body variable measuring system are respectively connected with the acquisition system; the air pressure control system transmits an air pressure analog signal, the air cylinder force transmission system transmits a pressure or displacement analog signal, and the volume variable measurement system transmits a water pressure analog signal;
the data acquisition system is connected with a computer, and the computer stores each analog signal and processes the analog signal to obtain required stress and strain data.
Preferably, each set of air pressure control system comprises an automatic pressure regulating valve and a pressure sensor, and the four sets of air pressure control systems comprise four automatic pressure regulating valves and four pressure sensors; wherein:
the air inlet ends of the four automatic pressure regulating valves are connected with an air pressure source; the air outlet ends of the automatic pressure regulating valves in the axial force air pressure control system and the torque air pressure control system are respectively connected with the inlet end of the air cylinder force transmission system, and the air outlet ends of the automatic pressure regulating valves in the inner confining pressure air pressure control system and the outer confining pressure air pressure control system are respectively connected with the inner cavity and the outer cavity of the confining pressure chamber; the signal input ends of the four automatic pressure regulating valves are connected with a computer;
the four pressure sensors are used as signal output ends of the air pressure control system and connected with a data acquisition system, and are used for transmitting air pressure analog signals to the data acquisition system.
Preferably, the cylinder force transfer system comprises: the device comprises an axial cylinder, a lateral cylinder, a vertical dowel bar, a horizontal dowel bar, an axial force and axial displacement sensor and a torque and corner displacement sensor; wherein:
the air inlet ends of the axial cylinder and the lateral cylinder are respectively connected with the air outlet ends of the axial force air compression control system and the torque air compression control system; the bottoms of the axial cylinder and the lateral cylinder are respectively connected with the vertical dowel bar and the horizontal dowel bar; the horizontal dowel bar drives the vertical dowel bar to rotate through the gear turntable; the axial force and axial displacement sensor and the torque and corner sensor are respectively connected with the vertical dowel bar and the horizontal dowel bar;
the axial force and axial displacement sensor and the torque and corner displacement sensor are used as signal output ends of the cylinder force transmission system and are connected with a data acquisition system, and are used for transmitting pressure and displacement analog signals to the data acquisition system;
and the output end of the air cylinder force transmission system is connected with the confining pressure chamber and used for applying shaft force and torque to a sample in the confining pressure chamber.
Preferably, the body variable measuring system includes: the device comprises an inner body variable pipe, an outer body variable pipe, an inner volume sensor, an outer volume sensor and a pore water pressure sensor; wherein:
the inner body variable pipe is connected with a sample inner cavity in the confining pressure chamber; the outer body variable pipe is connected with a sample in the confining pressure chamber; the inner volume sensor is connected with the inner variable tube; the outer volume sensor is connected with the outer body variable pipe; the pore water pressure sensor is connected with the outer body variable pipe;
the inner volume sensor, the outer volume sensor and the pore water pressure sensor are used as signal output ends of the volume variable measuring system to be connected with the data acquisition system and used for transmitting volume variable and water pressure analog signals to the data acquisition system.
Preferably, the data acquisition system comprises: line concentrator and multichannel reading appearance, wherein:
the input end of the wire collecting box is connected with the signal output ends of the air cylinder force transmission system, the body variable measurement system and the four groups of air pressure control systems and is used for receiving pressure and displacement analog signals output by the air cylinder force transmission system, body variable and water pressure analog signals output by the body variable measurement system and air pressure analog signals output by the four groups of air pressure control systems;
the input end of the multichannel reading instrument is connected with the output end of the line concentration box and used for receiving various analog signals, and the output end of the multichannel reading instrument is connected with the computer and used for transmitting various analog signals to the computer.
Compared with the prior art, the invention has the following beneficial effects:
the invention realizes that four loading parameters of axial force, torque and internal and external peripheral pressure can be automatically, independently and continuously controlled in a hollow cylinder anisotropy tester, realizes the coupling loading of the four parameters of axial force, torque and internal and external peripheral pressure in the shearing process of the granular material, is suitable for the tests of directional shearing, main stress axis rotation and the like of the granular material, can be used for researching the influence of the anisotropy of the granular material on the mechanical properties of the granular material, and provides design basis and technical support for related engineering projects.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural diagram of a preferred embodiment of the present invention;
FIG. 2 is a corner change map in accordance with a preferred embodiment of the present invention;
FIG. 3 is a torque diagram of a preferred embodiment of the present invention;
FIG. 4 is an axial diagram of a preferred embodiment of the present invention;
FIG. 5 is a graph of the internal and external circumferential pressures of a preferred embodiment of the present invention;
FIG. 6 is a graph of the stress experienced by the soil during shearing in accordance with a preferred embodiment of the present invention;
in the figure:
the device comprises a pressure source 1, an air pressure control system 2, a cylinder force transmission system 3, a confining pressure chamber 4, a body variable measurement system 5, a data acquisition system 6, a computer 7, an automatic pressure regulating valve 8, a pressure sensor 9, an axial cylinder 10, a lateral cylinder 11, a vertical dowel steel 12, a horizontal dowel steel 13, an axial force and axial displacement sensor 14, a torque and corner displacement sensor 15, an inner body variable pipe 16, an outer body variable pipe 17, an inner volume sensor 18, an outer volume sensor 19, a pore water pressure sensor 20, an outer cavity 21, an inner cavity 22 and a sample 23.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1, a hollow cylinder anisotropy tester for particulate materials, comprising: a pneumatic source 1, a data acquisition system 6, a cylinder power transmission system 3, confining pressure chamber 4, a body variation measurement system 5, and four groups of air pressure control systems 2, wherein:
the confining pressure chamber 4 is used for installing a granular material sample 23, structurally comprises an inner cavity 22 and an outer cavity 21, water is injected until the liquid level is higher than the sample during the test, and the inner cavity and the outer cavity apply water pressure through an inner confining pressure control system and an outer confining pressure control system 2 respectively;
the air pressure control system comprises four groups, namely an axial force air pressure control system, a torque air pressure control system, an inner surrounding pressure air pressure control system and an outer surrounding pressure air pressure control system, air inlet ends of the four groups of air pressure control systems 2 are connected with an air pressure source 1, air outlet ends of two groups of air pressure control systems 2 (comprising a group of axial force air pressure control systems and a group of torque air pressure control systems) are connected with an access end of an air cylinder force transmission system 3, air outlet ends of the other two groups of air pressure control systems 2 (comprising a group of inner surrounding pressure air pressure control systems and a group of outer surrounding pressure air pressure control systems) are respectively connected with an inner cavity 22 and an outer cavity 21 of a surrounding pressure chamber 4, and an output end of the air cylinder force transmission system 3 and air outlet ends of the two groups of air pressure control systems 2 (namely a group of inner surrounding pressure air pressure control systems and a group of outer surrounding pressure air pressure control systems) are connected with the surrounding pressure chamber;
the signal input ends of the four groups of air pressure control systems 2 are connected with a computer 7, and the computer 7 controls the four groups of air pressure control systems 2 to independently control four loading parameters of axial force, torque and internal and external ambient pressure to automatically and continuously load;
the signal output ends of the four groups of air pressure control systems 2, the air cylinder force transmission systems 3 and the volume variable measurement system 5 are connected with a data acquisition system 6 to transmit analog signals; wherein; the air pressure control system transmits an air pressure analog signal, the air cylinder force transmission system transmits a pressure or displacement analog signal, and the volume variable measurement system transmits a volume variable and water pressure analog signal;
the data acquisition system 6 is connected with the computer 7, and the computer 7 stores each analog signal and processes the analog signal to obtain the required stress and strain data.
Preferably, four sets of the air pressure control systems 2 each include: the four groups of air pressure control systems 2 are provided with four automatic pressure regulating valves 8 and four pressure sensors 9; wherein:
the air inlet ends of the four automatic pressure regulating valves 8 are connected with the air pressure source 1, and the signal input ends of the four automatic pressure regulating valves 8 are connected with the computer 7; the air outlet ends of the four automatic pressure regulating valves 8 are respectively connected with four pressure sensors 9, wherein the air outlet ends of two automatic pressure regulating valves 8 in two groups of air pressure control systems 2 (namely, an axial force air pressure control system and a torque air pressure control system) are connected with the cylinder force transmission system 3, the air outlet end of the automatic pressure regulating valve 8 in one group of air pressure control systems 2 (namely, an inner surrounding pressure air pressure control system) is connected with an inner cavity 22 of a surrounding pressure chamber 4, and the air outlet end of the automatic pressure regulating valve 8 in the other group of air pressure control systems 2 (namely, an outer surrounding pressure air pressure control system) is connected with an outer cavity 21 of the surrounding pressure chamber 4;
the pressure sensor 9 is used as a signal output end of the air pressure control system 2 and is connected with the data acquisition system 6 to transmit air pressure analog signals.
Preferably, the cylinder force transmission system 3 comprises: axial cylinder 10, side direction cylinder 11, perpendicular dowel steel 12, horizontal dowel steel 13, axial force and axial displacement sensor 14 and moment of torsion and corner sensor 15 that shifts, wherein:
the air inlet ends of the axial cylinder 10 and the lateral cylinder 11 are respectively connected with the air outlet ends of the axial force air pressure control system and the torque air pressure control system, the bottoms of the axial cylinder 10 and the lateral cylinder 11 are respectively connected with the vertical dowel bar 12 and the horizontal dowel bar 13, the axial force and axial displacement sensor 14 and the torque and corner displacement sensor 15 are respectively connected with the vertical dowel bar 12 and the horizontal dowel bar 13, and the horizontal dowel bar 13 drives the vertical dowel bar 12 to rotate through the gear turntable;
the axial force and axial displacement sensor 14 and the torque and corner displacement sensor 15 are used as signal output ends of the cylinder force transmission system 3 and are connected with the data acquisition system 6.
Preferably, the body variable measuring system 5 includes: an inner variable tube 16, an outer variable tube 17, an inner volume sensor 18, an outer volume sensor 19, and a pore water pressure sensor 20, wherein:
the inner body variable pipe 16 is connected with an inner cavity 22 of the confining pressure chamber 4, the outer body variable pipe 17 is connected with a sample 23 of the confining pressure chamber 4, the two volume sensors 18 and 19 are respectively connected with the two body variable pipes 16 and 17, and the pore water pressure sensor 20 is connected with the outer body variable pipe 17;
two volume sensors 18 and 19 and a pore water pressure sensor 20 are connected to the data acquisition system 6 as signal outputs of the volume variable measuring system 5.
Preferably, the data acquisition system 6 includes: line concentrator and multichannel reading appearance, wherein:
the input end of the line concentration box is connected with the output ends of the cylinder force transmission system 3, the volume variable measurement system 5 and the four groups of air pressure control systems 2 to receive analog signals, the input end of the multichannel reading instrument is connected with the line concentration box to receive the analog signals, and the output end of the multichannel reading instrument is connected with the computer 7.
The tester works in the following way:
1. a hollow cylinder sample is arranged in a confining pressure chamber 4, and the confining pressure chamber 4 is well connected with a cylinder force transmission system 3;
2. opening the data acquisition system 6 and adjusting the pressure of the automatic pressure regulating valve 8 to be 0 (kPa);
3. the automatic pressure regulating valve 8 gradually increases the output voltage (from 0 to 5v), increases the pressure from 0 to any value, measures the output air pressure value corresponding to each voltage value, obtains a correlation curve and a proportionality coefficient of the voltage and the output air pressure, and controls the output air pressure by the voltage according to the proportionality coefficient in the subsequent work.
4. The pressure of the automatic pressure regulating valve 8 is reset to zero;
5. inputting the size of a sample, consolidation and shearing time and test stress path information in a program;
6. starting an automatic control program, testing the full-automatic consolidation and shearing process controlled by the computer 7, and storing test data in a hard disk of the computer 7 until shearing is finished;
7. when the shearing is started, setting loading parameters of a torque air compression control system, wherein the loading parameters comprise a loading rate and a loading waveform; after the shearing is started, the computer 7 calculates the required axial force and the required internal and external peripheral pressures according to the torque read by the torque and the real-time torque read by the corner displacement sensor 15 in the cylinder force transmission system 3, sends analog signals to the pressure regulating valves 8 of the other three groups of automatic air pressure control systems 2 (namely, the axial force air pressure control system, the internal peripheral pressure air pressure control system and the external peripheral pressure air pressure control system), the pressure sensors 9 read pressure data and then transmit the analog signals to the computer 7 through the data acquisition system 6, the computer 7 calculates the difference between the target values and the current values of the three groups of air pressure of the axial cylinder, the internal peripheral pressure and the external peripheral pressure, and sends the analog signals to the automatic pressure regulating valves 8 again, and the processes are repeated until the precision meets the requirement;
8. after the cutting is finished, each system is stopped, and the data stored in the computer 7 is processed to obtain a required result.
As shown in fig. 2 to 6, the graphs obtained for collating the data stored in the computer 7:
controlling the alpha angle to be 30 degrees, the effective average principal stress to be 150kpa and the middle principal stress parameter b to be 0.5, carrying out drainage shearing on sandy soil, and setting the sample corner deflection to be uniform linear change, as shown in figure 2;
the torque, the axial force and the internal and external peripheral pressures obtained by actual measurement are respectively shown in fig. 3, 4 and 5;
the calculated stress state of the soil body in the shearing process is shown in fig. 6.
The invention realizes that four loading parameters of axial force, torque and internal and external peripheral pressure can be automatically, independently and continuously controlled in a hollow cylinder anisotropy tester, realizes the coupling loading of the four parameters of axial force, torque and internal and external peripheral pressure in the shearing process of the granular material, is suitable for the tests of directional shearing, main stress axis rotation and the like of the granular material, can be used for researching the influence of the anisotropy of the granular material on the mechanical properties of the granular material, and provides design basis and technical support for related engineering projects.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (2)
1. A hollow cylinder anisotropy tester of particulate material, comprising: atmospheric pressure source, pneumatics control system, cylinder force transmission system, confined chamber, volume variable measurement system and data acquisition system, wherein:
the confining pressure chamber is used for installing a granular material sample and structurally comprises an inner cavity and an outer cavity, water is injected until the liquid level is higher than the sample during a test, and the inner cavity and the outer cavity apply hydrostatic pressure through an inner confining pressure control system and an outer confining pressure control system respectively;
the air pressure control system comprises four groups, namely an axial force air pressure control system, a torque air pressure control system, an inner surrounding pressure air pressure control system and an outer surrounding pressure air pressure control system, wherein the air inlet ends of the four groups of air pressure control systems are connected with the air pressure source, the air outlet ends of the axial force air pressure control system and the torque air pressure control system are respectively connected with the access end of the air cylinder force transmission system, and the air outlet ends of the inner surrounding pressure air pressure control system and the outer surrounding pressure air pressure control system are respectively connected with the inner cavity and the outer cavity of the surrounding pressure chamber;
the output end of the cylinder force transmission system is connected with the confining pressure chamber;
the volume variable measuring system is connected with the confining pressure chamber;
the signal input ends of the four groups of air pressure control systems are all connected with a computer, and the computer controls the four groups of air pressure control systems to independently control four loading parameters of axial force, torque and internal and external peripheral pressure to automatically and continuously load;
the signal output ends of the four groups of air pressure control systems, the air cylinder force transmission systems and the body variable measurement system are respectively connected with the acquisition system, wherein the air pressure control system transmits an air pressure analog signal, the air cylinder force transmission system transmits a pressure or displacement analog signal, and the body variable measurement system transmits a water pressure analog signal;
the data acquisition system is connected with a computer, and the computer stores each analog signal and processes the analog signal to obtain required stress and strain data;
the cylinder force transfer system comprising: the device comprises an axial cylinder, a lateral cylinder, a vertical dowel bar, a horizontal dowel bar, an axial force and axial displacement sensor and a torque and corner displacement sensor; wherein:
the air inlet ends of the axial cylinder and the lateral cylinder are respectively connected with the air outlet ends of the axial force air compression control system and the torque air compression control system; the bottoms of the axial cylinder and the lateral cylinder are respectively connected with the vertical dowel bar and the horizontal dowel bar; the horizontal dowel bar drives the vertical dowel bar to rotate through the gear turntable; the axial force and axial displacement sensor and the torque and corner sensor are respectively connected with the vertical dowel bar and the horizontal dowel bar;
the axial force and axial displacement sensor and the torque and corner displacement sensor are used as signal output ends of the cylinder force transmission system and are connected with a data acquisition system, and are used for transmitting pressure and displacement analog signals to the data acquisition system;
the output end of the air cylinder force transmission system is connected with the confining pressure chamber and used for applying axial force and torque to a sample in the confining pressure chamber;
each group of air pressure control systems comprises an automatic pressure regulating valve and a pressure sensor, and the four groups of air pressure control systems are provided with four automatic pressure regulating valves and four pressure sensors; wherein: the air inlet ends of the four automatic pressure regulating valves are connected with an air pressure source; the air outlet ends of the automatic pressure regulating valves in the axial force air pressure control system and the torque air pressure control system are respectively connected with the inlet end of the air cylinder force transmission system, and the air outlet ends of the automatic pressure regulating valves in the inner confining pressure air pressure control system and the outer confining pressure air pressure control system are respectively connected with the inner cavity and the outer cavity of the confining pressure chamber; the signal input ends of the four automatic pressure regulating valves are connected with a computer; the four pressure sensors are used as signal output ends of the air pressure control system and connected with a data acquisition system, and are used for transmitting air pressure analog signals to the data acquisition system;
the body variable measuring system comprises: the device comprises an inner body variable pipe, an outer body variable pipe, an inner volume sensor, an outer volume sensor and a pore water pressure sensor; wherein:
the inner body variable pipe is connected with a sample inner cavity in the confining pressure chamber; the outer body variable pipe is connected with a sample in the confining pressure chamber; the inner volume sensor is connected with the inner variable tube; the outer volume sensor is connected with the outer body variable pipe; the pore water pressure sensor is connected with the outer body variable pipe; the inner variable pipe is used for measuring the total volume change of the sample, and the outer variable pipe is used for measuring the volume change of water in the sample;
the inner volume sensor, the outer volume sensor and the pore water pressure sensor are used as signal output ends of the volume variable measuring system and are connected with the data acquisition system, and are used for transmitting volume variable and water pressure analog signals to the data acquisition system;
when the shearing is started, setting loading parameters of a torque air compression control system, wherein the loading parameters comprise a loading rate and a loading waveform; after the shearing is started, the computer calculates the required axial force and the required inner and outer peripheral pressures according to the torque read by the torque and the real-time torque read by the corner displacement sensor in the air cylinder force transmission system, sends analog signals to the pressure regulating valves of the three automatic groups of air pressure control systems, namely the axial force air pressure control system, the inner peripheral pressure air pressure control system and the outer peripheral pressure air pressure control system, the pressure sensors transmit the analog signals to the computer through the data acquisition system after reading the pressure data, the computer calculates the difference between the target values and the current values of the three groups of air pressures, namely the axial air cylinder, the inner peripheral pressure and the outer peripheral pressure, resends the analog signals to the automatic pressure regulating valves, and repeats the processes until the precision meets the requirement.
2. The apparatus of claim 1, wherein the data acquisition system comprises: line concentrator and multichannel reading appearance, wherein:
the input end of the wire collecting box is connected with the signal output ends of the air cylinder force transmission system, the body variable measurement system and the four groups of air pressure control systems and is used for receiving pressure and displacement analog signals output by the air cylinder force transmission system, body variable and water pressure analog signals output by the body variable measurement system and air pressure analog signals output by the four groups of air pressure control systems;
the input end of the multichannel reading instrument is connected with the output end of the line concentration box and used for receiving various analog signals, and the output end of the multichannel reading instrument is connected with the computer and used for transmitting various analog signals to the computer.
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