CN109580365B - High-energy accelerator CT rock mechanics test system - Google Patents
High-energy accelerator CT rock mechanics test system Download PDFInfo
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- CN109580365B CN109580365B CN201811224053.6A CN201811224053A CN109580365B CN 109580365 B CN109580365 B CN 109580365B CN 201811224053 A CN201811224053 A CN 201811224053A CN 109580365 B CN109580365 B CN 109580365B
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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Abstract
The invention belongs to the technical field of mechanical test equipment, and particularly relates to a high-energy accelerator CT rock mechanical test system. The mechanical testing system for the high-energy accelerator CT rock comprises a mechanical testing machine, a high-energy accelerator CT ray source and a detector, wherein the mechanical testing machine is arranged between the high-energy accelerator CT ray source and the detector and comprises a fixing component, a rotating device and a pressure chamber, the rotating device is arranged on the fixing component, the pressure chamber is connected with the rotating device, and the pressure chamber can rotate relative to the fixing component under the driving of the rotating device during testing. Through setting up rotary device on the testing machine, when experimental, drive the pressure chamber through rotary device and rotate, can scan test sample in test sample carries out the loading test process promptly to make CT formation of image can reflect test sample's structural condition when the loading completely, more be favorable to scientific research.
Description
Technical Field
The invention belongs to the technical field of mechanical test equipment, and particularly provides a high-energy accelerator CT rock mechanical test system.
Background
The exploration and development of resources in the world are advanced to the second depth space (2000-10000 m) of the earth, ultra-deep vertical wells and horizontal wells are required for development of the resources, and geological body transformation must be carried out on a reservoir stratum to implement rock fracturing and permeability enhancement. The efficient development of the resources needs to solve the important basic scientific problems of the evolution of the rupture formation of the geologic body under the action of pressure and temperature, the gas-liquid migration rule and the physical property change characteristics, which are also the leading edge scientific problems of the cognition of the geologic body state and the geologic process.
The traditional rock mechanical test can obtain a macroscopic stress-strain curve of a sample, obtain a constitutive relation model of rock deformation and damage, and further be used for guiding engineering design. However, these test methods do not know the fracture evolution process and mechanism inside the rock, and the dynamic process of material migration and transformation. Therefore, the inherent essential cause of the macroscopic representation of the geologic body cannot be revealed, and the limitation of the traditional test method and means becomes the bottleneck for exploring the characteristics of evolution, gas-liquid migration rule and physical property change caused by the fracture of the geologic body under the action of pressure and temperature.
The black box for the rock mechanics test is opened, so that the interior of the rock sample can be observed in a transparent manner like glass, and the rock sample is ideal for scientists to use cumin. Computer Tomography (CT) techniques offer the potential to achieve this ideal. In the prior art, the CT scanning of the rock sample is performed after the rock sample is unloaded in most cases, however, after the rock sample is unloaded, part of elastic recovery of the damaged rock sample can be caused, and further, the structural state of the rock sample during loading can not be completely reflected by a CT image, and scientific research is influenced.
Therefore, there is a need in the art for a high energy accelerator CT rock mechanics testing system that addresses the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the existing rock mechanical test system performs CT scanning after unloading the rock sample, thereby causing the problem that the CT imaging can not completely reflect the structural state of the rock sample during loading, the invention provides a high-energy accelerator CT rock mechanics test system, the high-energy accelerator CT rock mechanical testing system comprises a mechanical testing machine, a high-energy accelerator CT ray source and a detector, the mechanical testing machine is arranged between the high-energy accelerator CT ray source and the detector, the mechanical testing machine comprises a fixed component, a rotating device and a pressure chamber, wherein the rotating device is arranged on the fixed component, the pressure chamber is connected with the rotating device, when the test is carried out, the pressure chamber can rotate relative to the fixed component under the driving of the rotating device.
In the preferable technical scheme of the high-energy accelerator CT rock mechanics testing system, the rotating device includes a bearing rotating mechanism and a loading rotating mechanism, the bearing rotating mechanism and the loading rotating mechanism are both disposed on the fixing member, the pressure chamber is connected between the bearing rotating mechanism and the loading rotating mechanism, and the bearing rotating mechanism, the pressure chamber and the loading rotating mechanism can rotate synchronously during testing.
In a preferred technical solution of the above high-energy accelerator CT rock mechanics testing system, the fixing member includes a bottom plate, a top plate, and a plurality of columns disposed between the bottom plate and the top plate, the bearing rotating mechanism is disposed on the bottom plate, and the loading rotating mechanism is disposed on the top plate.
In the preferable technical scheme of the high-energy accelerator CT rock mechanics testing system, the bearing rotating mechanism comprises a rotating platform, a first rotating oil cylinder, a self-aligning thrust roller bearing, a first driving member and a first transmission member, the rotating platform is arranged at the top of the first rotating oil cylinder, the first rotating oil cylinder and the first driving member are both arranged on the bottom plate, the self-aligning thrust roller bearing is arranged at the bottom of the first rotating oil cylinder, the first driving member is connected with the rotating platform through the first transmission member so as to drive the rotating platform to rotate, and when a test is carried out, the rotating platform can be connected with the bottom of the pressure chamber, and the top of the pressure chamber can be connected with the loading rotating mechanism so as to drive the pressure chamber and the loading rotating mechanism to synchronously rotate.
In the preferable technical scheme of the high-energy accelerator CT rock mechanics testing system, the first rotary oil cylinder comprises a first cylinder body and a first piston arranged in the first cylinder body, the first cylinder body is fixed on the bottom plate, the top of the first piston extends out of the first cylinder body to be connected with the rotary platform, and the bottom of the first piston extends out of the first cylinder body to be connected with the thrust self-aligning roller bearing.
In the preferable technical scheme of the high-energy accelerator CT rock mechanics testing system, the first driving member is a servo motor, the first driving member includes a speed reducer, a small belt wheel, a belt, a large belt wheel and a large belt wheel base, an output shaft of the servo motor is connected with the small belt wheel through the speed reducer, the small belt wheel is connected with the large belt wheel through the belt, the large belt wheel base is fixed at the top of the first cylinder body, and the large belt wheel is rotatably arranged on the large belt wheel base and connected with the rotating platform.
In the preferable technical scheme of the high-energy accelerator CT rock mechanics testing system, the circular grating reading head is arranged on the upper surface of the base of the large belt wheel, the circular grating ruler is arranged on the lower surface of the large belt wheel, and when the large belt wheel rotates, the circular grating reading head can read scales on the circular grating ruler in real time to detect the angular displacement of the large belt wheel.
In the preferable technical scheme of the high-energy accelerator CT rock mechanics testing system, the loading rotating mechanism includes a second rotating cylinder, a rotating slip ring and a torque limiter, the second rotating cylinder is fixed on the top plate, the rotating slip ring is arranged at the top of the second rotating cylinder, and the bottom of the second rotating cylinder is connected with the pressure chamber through the torque limiter.
In an optimal technical scheme of the high-energy accelerator CT rock mechanics testing system, the second rotary cylinder includes a second cylinder body and a second piston disposed in the second cylinder body, the rotary slip ring includes a stator and a rotor connected to each other, the second cylinder body is fixed to the top plate through a cylinder body connecting piece, the stator is fixed to the top of the second cylinder body, a through hole is disposed in the second piston along an axis, the top of the second piston extends out of the second cylinder body and is connected to the rotor, and the bottom of the second piston extends out of the second cylinder body and is connected to the pressure chamber through the torque limiter.
The technical scheme includes that the rotating device is arranged on the testing machine, and the rotating device drives the pressure chamber to rotate during testing, so that the test sample can be scanned during a loading test process of the test sample, and the structural state of the test sample during loading can be completely reflected by CT imaging, and scientific research is facilitated.
Furthermore, the bearing rotating mechanism and the loading rotating mechanism are arranged on the fixed component, the fixed component is used as a supporting reaction frame to bear supporting reaction force during testing, and the supporting reaction force borne by the fixed component is larger, so that the testing machine disclosed by the invention can be used for carrying out loading test on a large load, a large-size test sample can be subjected to loading test, and further, the CT scanning result can better reflect the heterogeneity and discontinuity of a real geologic body, and the scientific research is facilitated.
Furthermore, the bottom of first rotary oil cylinder has set up thrust self-aligning roller bearing, be connected the bottom of first piston with thrust self-aligning roller bearing, in the test process, thrust self-aligning roller bearing can play spacing effect to first piston, the upper end cover contact of first piston of restriction and first cylinder body, thereby guarantee that first piston is in the suspended state, and, first piston is in the vertical state all the time under thrust self-aligning roller bearing's effect, the top and the rotary platform of first piston are connected, thereby rotary platform's rotation stationarity has been improved.
And when the large belt wheel rotates, the circular grating reading head can read scales on the circular grating ruler in real time, and the rotation angle and the rotation speed of the large belt wheel can be calculated through detected data, so that the high-precision control of the rotary platform is realized.
Still further, the top of the second rotary oil cylinder is provided with a rotary slip ring, the rotary slip ring comprises a stator and a rotor which are connected, the stator is fixed on the top of the second cylinder body, a through hole is formed in the second piston along the axis, the top of the second piston extends out of the second cylinder body and is connected with the rotor, and the bottom of the second piston extends out of the second cylinder body and is connected with the pressure chamber through a torque limiter. When testing, the sensor circuit in the pressure chamber is connected to the interface of rotor through the inside through-hole of second piston to on leading out the control cabinet that transmits to ground with sensor signal through the stator, because the stator is fixed on the second cylinder body, it is fixed at the experimentation, thereby can avoid appearing the winding problem of circuit in the experimentation, guarantee that the experiment can go on smoothly. And the pressure chamber is connected with the second piston through the torque limiter to transmit torque, and when the torque is overlarge, the torque limiter is automatically separated, so that the pressure chamber can be prevented from being damaged due to the overlarge torque, and the service life of the pressure chamber is prolonged.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of a high-energy accelerator CT rock mechanics testing system of the present invention;
FIG. 2 is a schematic diagram of the overall structure of the mechanical test of the present invention;
FIG. 3 is a schematic structural view of the load bearing rotary mechanism of the present invention;
figure 4 is a cross-sectional view of a load bearing rotary mechanism of the present invention;
fig. 5 is a schematic structural diagram of the loading rotation mechanism of the present invention.
Detailed Description
First, it should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention. For example, although the components of the test system are illustrated in the drawings as being to scale, the relationship is not necessarily constant and can be adjusted as desired by one skilled in the art to suit a particular application.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "top", "bottom", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Based on the prior rock mechanics testing system pointed out in the background art, CT scanning is carried out after the rock sample is unloaded, so that the problem that the structural state of the rock sample cannot be completely reflected by CT imaging during loading is caused. The invention provides a high-energy accelerator CT rock mechanics test system, which aims to scan a test sample during a loading test, so that the structural state of the test sample during the loading can be completely reflected by CT imaging, and scientific research is facilitated.
Specifically, as shown in fig. 1, the high-energy accelerator CT rock mechanical testing system includes a mechanical testing machine a, a high-energy accelerator CT radiation source B and a detector C, the mechanical testing machine a is disposed between the high-energy accelerator CT radiation source B and the detector C, the mechanical testing machine a includes a fixing member 1, a rotating device and a pressure chamber 3, the rotating device is disposed on the fixing member 1, and when testing is performed, the pressure chamber 3 can rotate relative to the fixing member 1 under the driving of the rotating device. Through the arrangement, the test sample can be scanned in the loading test process of the test sample, so that the structural state of the test sample can be completely reflected in the CT imaging process during loading, and the CT imaging system is more favorable for scientific research. The high-energy accelerator CT ray source B comprises a ray source base B1, a ray source platform B2, a ray source B3, a ray source vertical guide rail B4 and a ray source bracket B5, wherein the ray source bracket B5 is fixed on the ray source base B1 through bolts, the ray source B3 is installed on the ray source platform B2, the ray source bracket B5 is provided with the ray source vertical guide rail B4, and the ray source platform B2 is connected through a guide rail slider to realize the up-and-down movement of the ray source B3; the detector C comprises a detector base C1, a detector horizontal guide rail C2, an area array detector C3, a detector platform C4, a detector support C5, a detector vertical guide rail C6 and a linear array detector C7, the detector base C1 is arranged on the ground and is parallel to the ray source base B1, the detector horizontal guide rail C2 is installed on the detector base C1, the detector support C5 is connected to the detector horizontal guide rail C2 through a guide rail slider, the horizontal movement of the area array detector C3 and the linear array detector C7 can be realized, the scanning visual field is adjusted, the detector platform C4 is connected to the detector vertical guide rail C6 through a guide rail slider, the height adjustment of the area array detector C3 and the detector C7 can be realized, the area array detector C3 and the linear array detector C7 are arranged on the detector platform C4, the two detectors can be switched according to different requirements, the optimal scanning quality is ensured, and the linear array detector C7 has higher imaging precision, the area array detector C3 has a larger visual field, can image the test sample in a large range, and obtains the distribution information of the cracks in the test sample in a three-dimensional space.
Preferably, as shown in fig. 2, the rotating device comprises a bearing rotating mechanism 2 and a loading rotating mechanism 4, the bearing rotating mechanism 2 and the loading rotating mechanism 4 are both arranged on the fixed member 1, the pressure chamber 3 is connected between the bearing rotating mechanism 2 and the loading rotating mechanism 4, and the bearing rotating mechanism 2, the pressure chamber 3 and the loading rotating mechanism 4 synchronously rotate when the test is carried out. Through the arrangement, the bearing rotating mechanism 2 and the loading rotating mechanism 4 are both arranged on the fixed component 1, the fixed component 1 is used as a supporting reaction frame to bear supporting reaction force during testing, and the supporting reaction force borne by the fixed component 1 is larger, so that the testing machine disclosed by the invention can be used for carrying out loading test on larger load, and thus, a large-size test sample can be subjected to loading test, and further, the CT scanning result can better reflect the heterogeneity and discontinuity of a real geologic body, and the testing machine is more beneficial to scientific research.
Preferably, as shown in fig. 2, the fixing member 1 includes a bottom plate 11, a top plate 12, and a plurality of columns 13 disposed between the bottom plate 11 and the top plate 12, the bearing rotation mechanism 2 is disposed on the bottom plate 11, and the loading rotation mechanism 4 is disposed on the top plate 12. Wherein, bottom plate 11 and roof 12 are the rectangle setting, and the quantity of stand 13 is 4 and sets up respectively on 4 angles of bottom plate 11 and roof 12, of course, also can set up bottom plate 11 and roof 12 into shapes such as square or circular, and the quantity of stand 13 is not limited to 4 either, and the skilled person in the art can set up the concrete shape of bottom plate 11 and roof 12 and the concrete quantity of stand 13 in practical application in a flexible way, as long as can bear the support counter force in the test process through bottom plate 11, roof 12 and the fixed component 1 of stand 13 constitution. Moreover, the upright column 13 and the bottom plate 11 may be fixedly connected or integrated, the upright column 13 and the top plate 12 may be fixedly connected or integrated, or the bottom plate 11, the upright column 13 and the top plate 12 may be integrated, and those skilled in the art may flexibly set the specific connection form of the upright column 13 and the bottom plate 11 and the top plate 12 in practical application as long as the upright column 13 can be fixed between the bottom plate 11 and the top plate 12.
Preferably, as shown in fig. 2, because the test sample has a large size and a heavy weight, a transport vehicle 51, a guide rail 52 and a fixing frame 53 are further provided on the base plate 11, the fixing frame 53 is fixed on the base plate 11, the guide rail 52 is provided on the fixing frame 53, and the transport vehicle 51 can move on the guide rail 52. In conducting the test, the pressure chamber 3 is placed on the transport vehicle 51, the test sample is mounted in the pressure chamber 3, and then the pressure chamber 3 is moved to the test position by the transport vehicle 51. Wherein, a lead screw is arranged on the guide rail 52, and the lead screw is driven by a transport motor to rotate so as to drive the transport vehicle 51 to move linearly. Of course, the lead screw may be manually rotated, or the lead screw is not provided, and the traveling wheels are directly installed on the transport vehicle 51, so that the transport vehicle 51 may roll on the track 52, or the slide block is provided on the transport vehicle 51, so that the transport vehicle 51 may slide on the track 52, and so on, and those skilled in the art may flexibly set the specific driving mode and the movement mode of the transport vehicle 51 in practical application, as long as the transport vehicle 51 can move on the track 52. In addition, the transportation vehicle 51 may be omitted, and the pressure chamber 3 may be moved directly by a manual or mechanical hand, and the adjustment and change of the specific moving manner of the pressure chamber 3 may not depart from the principle and scope of the present invention, and should be limited within the protection scope of the present invention.
Preferably, as shown in fig. 2, since the pressure chamber 3 is also large in size and heavy in weight, a lifting cylinder 6 is further provided at the top plate 12, before the test is performed, the lifting cylinder 6 is communicated with the pressure chamber 3, the pressure chamber 3 is opened by the lifting cylinder 6, then the test sample is installed in the pressure chamber 3, the pressure chamber 3 is closed by the lifting cylinder 6, the connection between the lifting cylinder 6 and the pressure chamber 3 is disconnected, and the pressure chamber 3 with the test sample is moved to the test position by the transport vehicle 51. Similarly, after the test is completed, the pressure chamber 3 with the unloading completed is moved to the position for taking and loading the test sample by the transport vehicle 51, the lifting oil cylinder 6 is communicated with the pressure chamber 3, the pressure chamber 3 is opened by the lifting oil cylinder 6, then the test sample is taken out from the pressure chamber 3, and the pressure chamber 3 is closed by the lifting oil cylinder 6. Of course, the pressure chamber 3 may be opened and closed manually or by providing a mechanical claw.
Preferably, as shown in fig. 3 and 4, the bearing and rotating mechanism 2 includes a rotating platform 21, a first rotating cylinder 22, a self-aligning thrust roller bearing 23, a first driving member and a first transmission member, the rotating platform 21 is disposed on the top of the first rotating cylinder 22, the first rotating cylinder 22 and the first driving member are both disposed on the bottom plate 11, the self-aligning thrust roller bearing 23 is disposed on the bottom of the first rotating cylinder 22, and the first driving member is connected with the rotating platform 21 through the first transmission member to drive the rotating platform 21 to rotate. The first rotary oil cylinder 22 comprises a first cylinder body 221 and a first piston 222 arranged in the first cylinder body 221, the first cylinder body 221 is fixed on the bottom plate 11, the top of the first piston 222 extends out of the first cylinder body 221 to be connected with the rotary platform 21, the bottom of the first piston 222 extends out of the first cylinder body 221 to be connected with the self-aligning thrust roller bearing 23, a bearing body 231 of the self-aligning thrust roller bearing 23 is connected with the bottom of the first cylinder body 221 through a bearing connecting plate 232, and a bearing pressing plate 233 is fixed at the bottom of the bearing body 231 to support the bearing body 231. When a test is performed, the transport vehicle 51 moves the pressure chamber 3 containing the test sample to the upper side of the rotary platform 21, the first rotary cylinder 22 is started, the first piston 222 is lifted to jack up the rotary platform 21, the rotary platform 21 is contacted with the bottom of the pressure chamber 3, the rotary platform 21 is fixedly connected with the base 31 of the pressure chamber 3, the top of the pressure chamber 3 is connected with the loading rotary mechanism 4, and the rotary platform 21, the pressure chamber 3 and the loading rotary mechanism 4 are synchronously rotated under the driving of the first driving component.
In addition, it should be noted that, the first rotary cylinder 22 is started to raise the first piston 222, and before the first piston 222 contacts with the upper end cap of the first cylinder 221, the first piston 222 is limited by the self-aligning thrust roller bearing 23, so as to limit the contact between the first piston 222 and the upper end cap of the first cylinder 221, thereby ensuring that the first piston 222 is in a suspended state, and under the action of the self-aligning thrust roller bearing 23, the first piston 222 is always in a vertical state, and the top of the first piston 222 is connected with the rotary platform 21, so as to improve the rotation stability of the rotary platform 21.
Preferably, as shown in fig. 3 and 4, the first driving member is a servo motor 24, the first driving member includes a reducer (not shown), a small pulley 25, a belt 26, a large pulley 27 and a large pulley base 28, an output shaft of the servo motor 24 is connected with the small pulley 25 through the reducer, the small pulley 25 is connected with the large pulley 27 through the belt 26, the large pulley base 28 is fixed on the top of the first cylinder 221, and the large pulley 27 is rotatably disposed on the large pulley base 28 and connected with the rotary platform 21. The servo motor 24 is fixed on the bottom plate 11 through a motor support 29, and a bearing 20, preferably a tapered roller bearing, is arranged at the joint of the large belt wheel 27 and the large belt wheel base 28. Of course, the first driving member may be provided as a general driving motor or the like, and those skilled in the art may flexibly set the specific type of the first driving member in practical applications as long as the driving is enabled by the first driving member. In addition, the first transmission member may also be configured as a structure form that the pinion gear is directly engaged with the gearwheel, etc., and those skilled in the art can flexibly set the specific structure form of the first transmission member in practical application as long as the first driving member can be connected with the rotating platform 21 through the first transmission member.
Preferably, as shown in fig. 4, a plurality of guide sleeves 271 are provided on the large pulley 27, a plurality of guide rods 211 are provided on the bottom of the rotary platform 21, the guide rods 211 are inserted into the guide sleeves 271, the large pulley 27 can rotate to drive the rotary platform 21 to rotate together, and when the rotary platform 21 is jacked up, the guide rods 211 can move up in the guide sleeves 271, but a part of the guide rods is always inserted into the guide sleeves 271. Wherein, the quantity of guide bar 211 is 10, evenly sets up in the bottom of rotary platform 21, correspondingly, the quantity of uide bushing 271 is also 10, the position that sets up of uide bushing 271 on big band pulley 27 is corresponding with guide bar 211 one-to-one, of course, the quantity of guide bar 211 and uide bushing 271 is all not limited to 10, the skilled person in the art can set up the specific quantity of guide bar 211 and uide bushing 271 in a flexible way in practical application, as long as can connect rotary platform 21 and big band pulley 27 through guide bar 211 and uide bushing 271 cooperation.
Preferably, as shown in fig. 4, in order to improve the control accuracy of the rotary platform 21, a circular grating reading head 71 is disposed on the upper surface of the large pulley base 28, and a circular grating scale 72 is disposed on the lower surface of the large pulley 27, so that when the large pulley 27 rotates, the circular grating reading head 71 can read the scales on the circular grating scale 72 in real time, and the rotation angle and the rotation speed of the large pulley 27 can be calculated from the detected data, thereby realizing the high-accuracy control of the rotary platform 21.
Preferably, as shown in fig. 2 and 5, the loading rotation mechanism 4 includes a second rotation cylinder 41, a rotation slip ring 42, and a torque limiter 43, the second rotation cylinder 41 is fixed on the top plate 12, the rotation slip ring 42 is disposed on the top of the second rotation cylinder 41, and the bottom of the second rotation cylinder 41 is connected to the pressure chamber 3 through the torque limiter 43. The second rotary cylinder 41 includes a second cylinder 411 and a second piston 412 disposed in the second cylinder 411, the rotary slip ring 42 includes a stator 421 and a rotor 422 connected to each other, a circular hole is disposed at a central portion of the top plate 12, the cylinder connector 44 penetrates through the circular hole and is fixedly connected to the top plate 12, the second cylinder 411 is fixedly connected to a top of the cylinder connector 44, the stator 421 is fixed to a top of the second cylinder 411, a through hole is disposed along an axis inside the second piston 412, a top of the second piston 412 extends out of the second cylinder 411 and is connected to the rotor 422, and a bottom of the second piston 412 extends out of the second cylinder 411 and is connected to the pressure chamber 3 through the torque limiter 43. When the test is carried out, the sensor circuit in the pressure chamber 3 is connected to the interface of the rotor 422 through the through hole in the second piston 412, and the sensor signal is led out and transmitted to the console on the ground through the stator 421, and the stator 421 is fixed on the second cylinder 411 and is fixed in the test process, so that the problem of circuit winding is solved.
In addition, during the test, the axial force is applied to the pressure chamber 3 through the second rotary cylinder 41, the pressure sensor arranged in the pressure chamber 3 can detect the axial pressure F2 of the second rotary cylinder 41 in real time, and transmit the pressure sensor signal to the pressure controller, the pressure controller outputs a control signal to the electro-hydraulic proportional valve according to the detected pressure sensor signal, the electro-hydraulic proportional valve controls the pressure F1 of the first rotary cylinder 22 according to the control signal, the pressure F1 of the first rotary cylinder 22 is always ensured to be greater than the pressure F2 of the second rotary cylinder 41, the partial force F3 is borne by the self-aligning thrust roller bearing 23, and the pressure difference between the pressure F1 of the first rotary cylinder 22 and the pressure F2 of the second rotary cylinder 41 is a fixed value, that is, the force F3 borne by the self-thrust roller bearing 23 is a fixed value, by such arrangement, the friction force brought by the self-thrust roller bearing 23 can be effectively controlled, the frictional force by the self-aligning thrust roller bearing 23 is controlled to be minimum. The supporting process of the bearing rotating mechanism 2 adopts mixed support, namely oil film and bearing support, thereby not only playing the positioning and aligning functions of the thrust aligning roller bearing 23, but also reducing the rotating friction resistance of the testing machine under heavy load condition, further improving the stability of the rotating platform 21 and being beneficial to the high-precision rotation control of the rotating platform 21.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (5)
1. The high-energy accelerator CT rock mechanical test system is characterized by comprising a mechanical test machine, a high-energy accelerator CT ray source and a detector, wherein the mechanical test machine is arranged between the high-energy accelerator CT ray source and the detector and comprises a fixed component, a rotating device and a pressure chamber, the rotating device is arranged on the fixed component, the pressure chamber is connected with the rotating device, and the pressure chamber can rotate relative to the fixed component under the driving of the rotating device during a test;
the rotating device comprises a bearing rotating mechanism and a loading rotating mechanism, the bearing rotating mechanism and the loading rotating mechanism are both arranged on the fixed component, the pressure chamber is connected between the bearing rotating mechanism and the loading rotating mechanism, and the bearing rotating mechanism, the pressure chamber and the loading rotating mechanism can synchronously rotate during testing;
the fixed component comprises a bottom plate, a top plate and a plurality of upright posts arranged between the bottom plate and the top plate, the bearing rotating mechanism is arranged on the bottom plate, and the loading rotating mechanism is arranged on the top plate;
the bearing and rotating mechanism comprises a rotating platform, a first rotating oil cylinder, a thrust self-aligning roller bearing, a first driving member and a first transmission member, the rotating platform is arranged at the top of the first rotating oil cylinder, the first rotating oil cylinder and the first driving member are both arranged on the bottom plate, the thrust self-aligning roller bearing is arranged at the bottom of the first rotating oil cylinder, the first driving member is connected with the rotating platform through the first transmission member to drive the rotating platform to rotate, when a test is carried out, the rotating platform can be connected with the bottom of the pressure chamber, and the top of the pressure chamber can be connected with the loading and rotating mechanism to drive the pressure chamber and the loading and rotating mechanism to synchronously rotate;
the first rotary oil cylinder comprises a first cylinder body and a first piston arranged in the first cylinder body, the first cylinder body is fixed on the bottom plate, the top of the first piston extends out of the first cylinder body to be connected with the rotary platform, and the bottom of the first piston extends out of the first cylinder body to be connected with the self-aligning thrust roller bearing;
still be provided with transport vechicle, guide rail and mount on the bottom plate, the mount is fixed on the bottom plate, the guide rail sets up on the mount, the transport vechicle can move on the guide rail.
2. The high-energy accelerator CT rock mechanics testing system of claim 1, wherein the first driving member is a servo motor, the first driving member comprises a reducer, a small pulley, a belt, a large pulley and a large pulley base, an output shaft of the servo motor is connected with the small pulley through the reducer, the small pulley is connected with the large pulley through the belt, the large pulley base is fixed on the top of the first cylinder, and the large pulley is rotatably disposed on the large pulley base and connected with the rotating platform.
3. The high-energy accelerator CT rock mechanical test system as claimed in claim 2, wherein the upper surface of the large pulley base is provided with a circular grating read head, the lower surface of the large pulley is provided with a circular grating ruler, and when the large pulley rotates, the circular grating read head can read scales on the circular grating ruler in real time to detect the angular displacement of the large pulley.
4. The high energy accelerator CT rock mechanics testing system of any one of claims 1 to 3, wherein the loading rotation mechanism comprises a second rotation cylinder, a rotation slip ring and a torque limiter, the second rotation cylinder is fixed on the top plate, the rotation slip ring is arranged on the top of the second rotation cylinder, and the bottom of the second rotation cylinder is connected with the pressure chamber through the torque limiter.
5. The high-energy accelerator CT rock mechanics testing system of claim 4, wherein the second rotary cylinder comprises a second cylinder body and a second piston arranged in the second cylinder body, the rotary slip ring comprises a stator and a rotor which are connected, the second cylinder body is fixed on the top plate through a cylinder body connecting piece, the stator is fixed on the top of the second cylinder body, a through hole is formed in the second piston along an axis, the top of the second piston extends out of the second cylinder body and is connected with the rotor, and the bottom of the second piston extends out of the second cylinder body and is connected with the pressure chamber through the torque limiter.
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| CN111351703B (en) * | 2020-03-23 | 2022-06-17 | 北京工业大学 | Skeletal mechanics loading tester capable of synchronous CT imaging |
| CN114062244A (en) * | 2020-08-03 | 2022-02-18 | 北京理工大学 | Experiment measurement device, experiment equipment and experiment measurement method |
| CN112504832B (en) * | 2020-12-04 | 2022-03-08 | 东北大学 | True triaxial real-time scanning CT (computed tomography) testing device and method in high-pressure hard rock fracturing process |
| CN114740026B (en) * | 2022-04-06 | 2022-11-01 | 安徽理工大学 | Hydraulic coupling experimental device and method with CT real-time scanning function |
| CN116519488B (en) * | 2023-06-29 | 2023-09-12 | 中国科学院地质与地球物理研究所 | Multifunctional rock triaxial visual test system |
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| CN1090928C (en) * | 1997-04-03 | 2002-09-18 | 南京理工大学 | Laser rotary scanning interference CT instrument |
| US5932874A (en) * | 1997-10-10 | 1999-08-03 | Analogic Corporation | Measurement and control system for controlling system functions as a function of rotational parameters of a rotating device |
| CN102778464B (en) * | 2011-05-13 | 2015-02-11 | 中国石油化工股份有限公司 | High-temperature high-pressure industrial CT scanning system and usage method |
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