CN104596861A - Visual tri-axial testing machine - Google Patents
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- CN104596861A CN104596861A CN201510022910.4A CN201510022910A CN104596861A CN 104596861 A CN104596861 A CN 104596861A CN 201510022910 A CN201510022910 A CN 201510022910A CN 104596861 A CN104596861 A CN 104596861A
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Abstract
The invention discloses a visual tri-axial testing machine; a pedestal is fixed in the centre of the top surface of a lower locating plate (2); a transparent pressure chamber (5) is installed on the pedestal; a loading head (8) is arranged at the lower end of a piston of a hydraulic cylinder (7); the loading head (8) is positioned below an upper locating plate (4) and is opposite to a pressure rod of the transparent pressure chamber (5); a linear differential transformer (9) is arranged right above the hydraulic cylinder (7); a probe of the linear differential transformer (9) is vertical downwards and contacted with the upper end of the piston of the hydraulic cylinder (7); and four cameras (11) and three vidicons (12) are arranged on the periphery of the transparent pressure chamber (5). The visual tri-axial testing machine disclosed by the invention is simple and compact in structure, convenient to assemble, low in cost, good in stability, high in hardware control test precision, good in reliability and long in holding time; the radial deformation of a test piece can be visually observed; and the radial deformation of the test piece can be measured relatively accurately in combination with image processing system software through photographing equipment.
Description
Technical field
The present invention relates to a kind of visual three-axis tester, for the test of rock (soil) mechanical characteristics.
Background technology
Triaxial test system is that one meets modern rock-soil mechanics research field, the new test equipment of study of rocks (soil) mechanical characteristic.Configuration confined pressure system, rock extensometer, high/low temperature system, pore water pressure system, rock direct shear test system and rock shearing, splitting fixture etc. can be required according to difference.Automatically can complete the triaxial compression test of rock under different confined pressure, hole permeability test, high-low-temperature environmental testing etc., and the triaxial test of the multiple control modes such as the combined waveform programmed control that unidirectional low Zhou Xunhuan and user arrange voluntarily can be carried out.Rock triaxial test is the important means of study of rocks mechanics, and rock triaxial test data are rock mechanics important parameters.It more intactly can simulate the mechanical property of ground under stress state primitively, is the important evidence of engineering design.Because deep rock is in complicated stress state, the rock mass run in mining engineering or ore body many places, in three-dimensional stress state, itself are again a kind of very complicated natural materials; Under many circumstances, the test of rock stress under Simple stress condition can not reflect the rock mass stress state in engineering reality completely, must fully realize the mechanical property of rock under complex stress condition.Therefore the rock test research carried out under three Spindle Status seems very important.
1, conventional rock triaxial test machine
Rock triaxial test machine is the fundamental test equipment of study of rocks mechanical property, according to the feature of rock test code and current engineering construction, develop high performance rock triaxial test machine with the repacking of existing pressure testing machine, it can be applied to the rock Three axis creep test under the rock triaxial shear test of high confining pressure, confined pressure controlled condition.Can set test parameters as requested, whole process of the test adopts microcomputer to control, and automatically records test figure, is the rock triaxial test equipment of higher, the both economical practicality of degree automatically at present.The base of ordinary triaxial test machine metal material and pressure chamber's sidewall form the enclosure space of a high strength, hydraulic system provides hydraulic oil by oil-in to confined space, hydraulic oil provides confined pressure by the negligible heat-shrink tube of surface of test piece intensity to test specimen, axial compression then with the depression bar crossing test piece upper part, is applied by hydraulic jack.Axial compression and confined pressure are all equipped with servo-control system, can servocontrol, ensure the stability that confined pressure and axial compression load.
Defect: the main object of ordinary triaxial test equipment is that research different materials test specimen is under triaxial compressions condition, the Distortion Disciplinarian of test specimen.Because pressure chamber (cavity) is made up of alloy, when guarantee high strength, sacrifice the visuality of test piece deformation, the axial deformation of test specimen is determined by the displacement of depression bar, and radial deformation can only by arranging hoop extensometer indirect inspection in test specimen side.And under the prerequisite of radial deformation rule cannot studying test specimen under this certain test condition, owing to being permitted rocky destruction, do not occur in the center section of rock sample, so, adopt and apply mechanically hoop extensometer at rock center section to measure the result of radial deformation accurate not.And extensometer is while guarantee precision, range is limited, so the distortion obtained also is limited, the Changing Pattern obtained is incomplete.Material bending in experimentation, break, the important information such as Crack Extension also cannot obtain.
2, transparent pressure room soil body testing equipment
When research soil body mechanical property and deformation rule, often can use the three-axis tester of transparent pressure room, pressure chamber is generally made up of glass, can ensure visual preferably.But due to the fragility of glass material, just can not adopt strong sealing at sealing part, otherwise glass can be cracked.The confined pressure that visual pressure chamber in the mechanics test of native land can provide is general not higher than 2MPa.
Summary of the invention
Technical matters to be solved by this invention is to provide the visual three-axis tester that a kind of structure is simple, accuracy is good.
Technical scheme of the present invention is as follows: a kind of visual three-axis tester, there is fixed mount (1), its key is: arrange lower location-plate (2) at the top of described fixed mount (1), the top of this lower location-plate (2) is supported with location-plate (4) by counter-force post (3), at the central fixed base of described lower location-plate (2) end face, dynamometer (6) this pedestal is equipped with, and at the top of pedestal, transparent pressure room (5) is installed, directly over described transparent pressure room (5), hydraulic cylinder (7) is set, this hydraulic cylinder (7) is installed on location-plate (4), the lower end of hydraulic cylinder (7) piston is provided with loading head (8), this loading head (8) is positioned at the below of location-plate (4) also just to the depression bar of transparent pressure room (5), linear variable differential transformer (LVDT) (9) is provided with directly over described hydraulic cylinder (7), this linear variable differential transformer (LVDT) (9) is arranged on the cylinder body of hydraulic cylinder (7) by support (10), the probe of described linear variable differential transformer (LVDT) (9) straight down, and with the upper-end contact of hydraulic cylinder (7) piston,
The oil-in of described transparent pressure room (5) is connected to fuel feed pump (16), this fuel feed pump (16) is connected with manual pump (17), described fuel feed pump (16) is connected to arm (18), this arm (18) is connected with the oil nozzle (24) of energy accumulator housing (20) bottom, pouch (22) is provided with in energy accumulator housing (20), inert gas (21) is filled with in this pouch (22), at the top of pouch (22), spool (23) is installed, spool (23) protrudes upward energy accumulator housing (20) outward, hydraulic oil (19) is filled with in the space that described pouch (22) and energy accumulator housing (20) are formed,
Four cameras (11) and three video cameras (12) are arranged with at the outer of described transparent pressure room (5), four cameras (11) are on sustained height, these four cameras (11) are circumferentially uniformly distributed, and the center of circle of four camera (11) place circumference is positioned on the axial line of transparent pressure room (5), three video cameras (12) are circumferentially uniformly distributed on sustained height, the position of video camera (12) is higher than the position of camera (11), wherein a video camera (12) and one of them camera (11) are positioned at same vertical plane.
Adopt above technical scheme, first test specimen is put into transparent pressure indoor, make between the seaming chuck of test specimen in transparent pressure room and push-down head, then the handle of manual pump is operated, make manual pump by fuel feed pump logical hydraulic oil in transparent pressure room, to provide confined pressure, simulation rock, the time of day of coal petrography, then the piston of hydraulic control cylinder moves downward, test specimen is compressed, while hydraulic cylinder piston moves downward, the probe of linear variable differential transformer (LVDT) is subjected to displacement, linear variable differential transformer (LVDT) and dynamometer coordinate, under the effect of corresponding control circuit, axial deformation and the pressure of test specimen can be measured.
Oil-feed in transparent pressure room, can the deformation behaviour of direct vision test specimen.In process of the test, camera pictures taken, video camera capture video, image processing system software is opened by control computer, carries out the collection of image, analysis, process, resolve picture pixels, can the radial deformation of analytical calculation test specimen; Image processing system software imports the video that process of the test photographs and controls, and in units of the time, edits video, analyzes, processes, and forms full automatic process.
One aspect of the present invention structure is simple, compact, and easily, cost is low in assembling; On the other hand, dynamometer, test specimen, hydraulic cylinder and linear variable differential transformer (LVDT) are on same vertical curve, thus the stress under effectively prevent contractive condition is concentrated, and makes test specimen in process of the test be in confined state completely, and test figure accurately, reliably; Meanwhile, adopt visual means and combining image analytical approach, the radial deformation of test specimen can be measured more accurately.
The present invention adopts manual pump as the power source of hydraulic oil, not only simple, convenient, and economic, practical, can effectively reduce costs.Because in process of the test, the pressure of transparent pressure indoor can decline, therefore, the 8Mpa pouch in energy accumulator housing is adopted to be continuously the pressure that transparent pressure room provides 10Mpa.In accumulator, mainly contain 8Mpa inert gas pouch, outside pouch, have the hydraulic oil of 10Mpa in energy accumulator housing, this hydraulic oil is communicated with transparent pressure room by arm and fuel feed pump.If the maintain constant pressure of transparent pressure room, then in accumulator, hydraulic oil and inert gas pouch keep steady state (SS), if transparent pressure room pressure decline build-up of pressure is poor, are then continued to transparent pressure room supply pressure by the 10Mpa hydraulic oil in accumulator.With upper type makeup oil pressure in time, stable pressure can be provided for transparent pressure room, thus further ensure that test findings is true, reliable.
In order to simplify structure, convenient for assembly, and guarantee the stability on testing machine top, described lower location-plate (2) is connected by the counter-force post (3) that two are parallel to each other with upper location-plate (4), and the upper and lower side of this counter-force post (3) is locked with corresponding location-plate by nut.
In order to make more compact structure, and be conducive to line arrangement, at the back side of described hydraulic cylinder (7), servo-valve (13) is installed, the side of this servo-valve (13) is provided with filtrator (14), the outlet of described filtrator (14) is communicated with the oil-in of servo-valve (13), is connected to oil inlet pipe (15) in the import of filtrator (14).
In order to make, linear variable differential transformer (LVDT) is installed firmly, reliably, dismounting convenience is good, and described linear variable differential transformer (LVDT) (9) is installed on support (10) by upper and lower two anchor ears.
Described energy accumulator housing (20) is arranged on locating rack (27), this locating rack (27) comprises bottom girder (28), vertical beam (29), supporting plate (30) and riser (31), wherein, two foundation beams (28) are arranged in parallel on ground, two vertical beams be parallel to each other (29) are provided with between two foundation beams (28), the lower end of each vertical beam (29) and the middle part of respective side bottom girder (28) fit fixing, riser (31) is connected between the top of two vertical beams (29), bottom and the supporting plate (30) of this riser (31) fix, described energy accumulator housing (20) is supported on supporting plate (30), the oil nozzle (24) of energy accumulator housing (20) bottom is through the via hole in the middle part of supporting plate (30), the band (32) of circular arc is provided with at the middle part of described energy accumulator housing (20), this band (32) and energy accumulator housing (20) fit, the two ends of band (32) are all welded with stud (25), this stud (25) is through riser (31), and by nut lock.Above structure on the one hand locating rack moulding is simple, and processing and fabricating is easy, and good stability, can not shake; On the other hand, the bottom of energy accumulator housing is held by supporting plate, and band with the form of semi-surrounding by the middle part banding of energy accumulator housing on riser, accumulator dismounting is convenient, has connected not only firmly but also reliable.
For the ease of selection, reduce production cost further, described bottom girder (28) and vertical beam (29) are angle bar.
Stiffening plate plays a part to increase structural strength, and it is firm to make to be connected between riser with supporting plate, can not occur to loosen or come off.Stiffening plate (26) is symmetrically arranged with at the two ends of described supporting plate (30), this stiffening plate (26) is right-angle triangle, a right-angle side and the supporting plate (30) of stiffening plate (26) are welded and fixed, and another right-angle side and the riser (31) of stiffening plate (26) are welded and fixed.
The invention has the beneficial effects as follows:
1, structure is simple, compact, takes up room little, and easy to assembly, cost is low, good stability;
2, hardware controls is adopted, especially to Mineral rheology test, high by hardware controls test accuracy, good reliability, hold time is long;
3, environmental protection and energy saving, power consumption is low, is about 1/10 of ordinary test machine power consumption;
4, test specimen axial deformation adopts state-of-the-art linear variable differential transformer (LVDT), and measuring accuracy is high, and deformation accuracy is 5.0mm ± 1%, overcomes the defect that ordinary test machine measuring accuracy is low;
5, can the radial deformation of direct vision test specimen, by capture apparatus and combining image disposal system software, the radial deformation of test specimen more can accurately be measured;
6, in process of the test, observe the flowing of liquid vapour mixture, calculate the flow etc. of air-water mixture, by the structure of invention, to the seepage characteristic research that rock, coal petrography are correlated with, by visual pressure room, observe the damage-form under the stress seepage effect such as the single shaft of coal seam containing gas, three axles intuitively, to coal-seam gas, shale gas and crude oil production, there is very important directive significance.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the side view on top of the present invention.
Fig. 3 is the layout schematic diagram of camera and video camera in the present invention.
Fig. 4 is fluid path structural representation of the present invention.
Fig. 5 is the side view of locating rack.
Fig. 6 is the front view of locating rack.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
As shown in Figure 1, fixed mount 1 is framed structure, and foot bolt is all equipped with in four angles place bottom this fixed mount 1.Arrange lower location-plate 2 at the top of fixed mount 1, this lower location-plate 2 is preferably rectangle, and is positioned on surface level.Location-plate 4 is provided with directly over lower location-plate 2, upper location-plate 4 is also preferably rectangle, upper location-plate 4 parallels with lower location-plate 2, the counter-force post 3 that upper location-plate 4 is parallel to each other by two, left and right with lower location-plate 2 is connected, counter-force post 3 is perpendicular to upper location-plate 4, and the upper and lower side of this counter-force post 3 is locked with corresponding location-plate by nut.
As shown in Figure 1 and Figure 2, at the central fixed base of lower location-plate 2 end face, this pedestal is equipped with dynamometer 6, and installs transparent pressure room 5 at the top of pedestal, this transparent pressure room 5 is between two counter-force posts 3.Transparent pressure room 5 to be first-classly made up of top board, base, acrylic glass, depression bar, seaming chuck, the transparent heat draw and pressing down, and the depression bar of transparent pressure room 5 protrudes upward the end face of top board.Transparent pressure room 5 can to adopt with Chinese patent CN 201410269471.2 the same or similar structure of visual three axle seepage apparatus disclosed in 27 days Augusts in 2014, and therefore not to repeat here.Directly over transparent pressure room 5, arrange hydraulic cylinder 7, this hydraulic cylinder 7 is installed on location-plate 4.The axial line of hydraulic cylinder 7 is perpendicular to upper location-plate 4, and the lower end of hydraulic cylinder 7 piston is provided with loading head 8, and this loading head 8 is positioned at the below of location-plate 4 also just to the depression bar of transparent pressure room 5.At the back side of hydraulic cylinder 7, servo-valve 13 is installed, the turnover oil of servo-valve 13 hydraulic control cylinder 7.Be provided with filtrator 14 on the side of servo-valve 13, the outlet of filtrator 14 is communicated with the oil-in of servo-valve 13, is connected to oil inlet pipe 15 in the import of filtrator 14, and oil inlet pipe 15 connects hydraulic oil source.
As shown in Figure 1 and Figure 2, linear variable differential transformer (LVDT) 9 is provided with directly over hydraulic cylinder 7, the axial line of this linear variable differential transformer (LVDT) 9 is vertical with upper location-plate 4, and linear variable differential transformer (LVDT) 9 is installed on support 10 by upper and lower two anchor ears, and support 10 is fixed on the cylinder body of hydraulic cylinder 7.The probe of linear variable differential transformer (LVDT) 9 straight down, and the upper-end contact of the probe of linear variable differential transformer (LVDT) 9 and hydraulic cylinder 7 piston.Linear variable differential transformer (LVDT) belongs to prior art, and therefore not to repeat here for its structure and working principle.
As shown in Figure 1, Figure 3, four cameras 11 and three video cameras 12 are arranged with at the outer of transparent pressure room 5, four cameras 11 are on sustained height, these four cameras 11 are circumferentially uniformly distributed, and the center of circle of four camera 11 place circumference is positioned on the axial line of transparent pressure room 5, the center of test block just treated by each camera 11.Three video cameras 12 are circumferentially uniformly distributed on sustained height, and the position of video camera 12 is a little more than the position of camera 11, and wherein a video camera 12 and one of them camera 11 are positioned at same vertical plane.
As shown in Figure 1, Figure 2, described in Fig. 4, the oil-in of transparent pressure room 5 is connected to fuel feed pump 16, and this fuel feed pump 16 is connected with manual pump 17.Between transparent pressure room 5 and the connecting line of manual pump 17, be provided with accumulator, this accumulator is made up of parts such as energy accumulator housing 20, pouch 22, spool 23, oil nozzle 24 and sheaths.Wherein, pouch 22 is arranged in energy accumulator housing 20, and be filled with inert gas 21 in this pouch 22, inert gas 21 is preferably nitrogen, and the pressure of inert gas 21 is preferably 8Mpa.Install spool 23 at the top of pouch 22, spool 23 protrudes upward outside energy accumulator housing 20, and pouch 22 can carry out inflating or being vented by spool 23.At the upper end of spool 23 suit sheath, this sheath is by nut lock, and sheath is to spool 23 protective actions.In the space that described pouch 22 and energy accumulator housing 20 are formed, be filled with hydraulic oil 19, the pressure of hydraulic oil 19 is preferably 10Mpa.Arrange oil nozzle 24 in the bottom of energy accumulator housing 20, one of oil nozzle 24 and arm 18 is connected, and the other end of arm 18 is connected on fuel feed pump 16, and the hydraulic oil 19 in energy accumulator housing 20 is communicated with transparent pressure room 5 by arm 18 and fuel feed pump 16.
As described in Fig. 4, Fig. 5, Fig. 6, energy accumulator housing 20 is arranged on locating rack 27, and this locating rack 27 is made up of bottom girder 28, vertical beam 29, supporting plate 30, riser 31 and stiffening plate 26 etc.Wherein, bottom girder 28 is preferably angle bar, and two foundation beams 28 are parallel to each other, and are symmetrically arranged on ground.Between two foundation beams 28, be provided with two vertical beams be parallel to each other 29, vertical beam 29 is also preferably angle bar, and vertical beam 29 is perpendicular to bottom girder 28, and the lower end of each vertical beam 29 and the middle part of respective side bottom girder 28 fit, and by being welded and fixed.Between the top of two vertical beams 29, connect riser 31, riser 31 welds with vertical beam 29, and the bottom of this riser 31 is welded and fixed mutually with supporting plate 30, and riser 31 and supporting plate 30 form " L " shape structure.Be symmetrically arranged with stiffening plate 26 at the two ends of supporting plate 30, this stiffening plate 26 is right-angle triangle, and a right-angle side of stiffening plate 26 and supporting plate 30 are welded and fixed, and another right-angle side and the riser 31 of stiffening plate 26 are welded and fixed.
As shown in Figure 5, Figure 6, the bottom support of energy accumulator housing 20 is on supporting plate 30, and the oil nozzle 24 bottom energy accumulator housing 20 is passed down through the via hole in the middle part of supporting plate 30.Be provided with the band 32 of circular arc at the middle part of energy accumulator housing 20, this band 32 fits with the form of semi-surrounding and energy accumulator housing 20, and the two ends of band 32 are all welded with stud 25, and this stud 25 passes riser 31, and by nut lock.
Principle of work of the present invention is as follows:
First test specimen is put into transparent pressure room 5, make between the seaming chuck of test specimen in transparent pressure room 5 and push-down head, then the handle of manual pump 17 is operated, make manual pump 17 by fuel feed pump 16 logical hydraulic oil in transparent pressure room 5, to provide confined pressure to test specimen, simulation rock, the time of day of coal petrography, then the piston of hydraulic control cylinder 7 moves downward, test specimen is compressed, while hydraulic cylinder 7 piston moves downward, the probe of linear variable differential transformer (LVDT) 9 is subjected to displacement, linear variable differential transformer (LVDT) 9 and dynamometer 6 coordinate, under the effect of corresponding control circuit, axial deformation and the pressure of test specimen can be measured.
5 oil-feeds in transparent pressure room, can the deformation behaviour of direct vision test specimen; In process of the test, camera 11 pictures taken, video camera 12 capture video, image processing system software is opened by control computer, carries out the collection of image, analysis, process, resolve picture pixels, can the radial deformation of analytical calculation test specimen; Image processing system software imports the video that process of the test photographs and controls, and in units of the time, edits video, analyzes, processes, and forms full automatic process.
The present invention removes transparent pressure room, mounting seat and push-down head on pedestal, can carry out uniaxial compression test.
Claims (7)
1. a visual three-axis tester, there is fixed mount (1), it is characterized in that: at the top of described fixed mount (1), lower location-plate (2) is set, the top of this lower location-plate (2) is supported with location-plate (4) by counter-force post (3), at the central fixed base of described lower location-plate (2) end face, dynamometer (6) this pedestal is equipped with, and at the top of pedestal, transparent pressure room (5) is installed, directly over described transparent pressure room (5), hydraulic cylinder (7) is set, this hydraulic cylinder (7) is installed on location-plate (4), the lower end of hydraulic cylinder (7) piston is provided with loading head (8), this loading head (8) is positioned at the below of location-plate (4) also just to the depression bar of transparent pressure room (5), linear variable differential transformer (LVDT) (9) is provided with directly over described hydraulic cylinder (7), this linear variable differential transformer (LVDT) (9) is arranged on the cylinder body of hydraulic cylinder (7) by support (10), the probe of described linear variable differential transformer (LVDT) (9) straight down, and with the upper-end contact of hydraulic cylinder (7) piston,
The oil-in of described transparent pressure room (5) is connected to fuel feed pump (16), this fuel feed pump (16) is connected with manual pump (17), described fuel feed pump (16) is connected to arm (18), this arm (18) is connected with the oil nozzle (24) of energy accumulator housing (20) bottom, pouch (22) is provided with in energy accumulator housing (20), inert gas (21) is filled with in this pouch (22), at the top of pouch (22), spool (23) is installed, spool (23) protrudes upward energy accumulator housing (20) outward, hydraulic oil (19) is filled with in the space that described pouch (22) and energy accumulator housing (20) are formed,
Four cameras (11) and three video cameras (12) are arranged with at the outer of described transparent pressure room (5), four cameras (11) are on sustained height, these four cameras (11) are circumferentially uniformly distributed, and the center of circle of four camera (11) place circumference is positioned on the axial line of transparent pressure room (5), three video cameras (12) are circumferentially uniformly distributed on sustained height, the position of video camera (12) is higher than the position of camera (11), wherein a video camera (12) and one of them camera (11) are positioned at same vertical plane.
2. visual three-axis tester according to claim 1, it is characterized in that: described lower location-plate (2) is connected by the counter-force post (3) that two are parallel to each other with upper location-plate (4), and the upper and lower side of this counter-force post (3) is locked with corresponding location-plate by nut.
3. visual three-axis tester according to claim 1 and 2, it is characterized in that: at the back side of described hydraulic cylinder (7), servo-valve (13) is installed, the side of this servo-valve (13) is provided with filtrator (14), the outlet of described filtrator (14) is communicated with the oil-in of servo-valve (13), is connected to oil inlet pipe (15) in the import of filtrator (14).
4. visual three-axis tester according to claim 1, is characterized in that: described linear variable differential transformer (LVDT) (9) is installed on support (10) by upper and lower two anchor ears.
5. visual three-axis tester according to claim 1, it is characterized in that: described energy accumulator housing (20) is arranged on locating rack (27), this locating rack (27) comprises bottom girder (28), vertical beam (29), supporting plate (30) and riser (31), wherein, two foundation beams (28) are arranged in parallel on ground, two vertical beams be parallel to each other (29) are provided with between two foundation beams (28), the lower end of each vertical beam (29) and the middle part of respective side bottom girder (28) fit fixing, riser (31) is connected between the top of two vertical beams (29), bottom and the supporting plate (30) of this riser (31) fix, described energy accumulator housing (20) is supported on supporting plate (30), the oil nozzle (24) of energy accumulator housing (20) bottom is through the via hole in the middle part of supporting plate (30), the band (32) of circular arc is provided with at the middle part of described energy accumulator housing (20), this band (32) and energy accumulator housing (20) fit, the two ends of band (32) are all welded with stud (25), this stud (25) is through riser (31), and by nut lock.
6. visual three-axis tester according to claim 1, is characterized in that: described bottom girder (28) and vertical beam (29) are angle bar.
7. the visual three-axis tester according to claim 5 or 6, it is characterized in that: be symmetrically arranged with stiffening plate (26) at the two ends of described supporting plate (30), this stiffening plate (26) is right-angle triangle, a right-angle side and the supporting plate (30) of stiffening plate (26) are welded and fixed, and another right-angle side and the riser (31) of stiffening plate (26) are welded and fixed.
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| CN105445099A (en) * | 2015-12-14 | 2016-03-30 | 榆林学院 | Experiment apparatus for observing generation and development of concrete cracks |
| CN106813994A (en) * | 2017-03-22 | 2017-06-09 | 重庆大学 | The large-scale many specimen test devices of MTS CYCLIC LOADINGs single and discreteness discrimination method |
| CN107063882A (en) * | 2017-05-15 | 2017-08-18 | 四川大学 | A kind of Rock Mechanics Test system for simulating deep ground environment |
| CN107478516A (en) * | 2017-08-05 | 2017-12-15 | 中山大学 | Sillar falls the novel pressure room that sample exports automatically in a kind of hyperbaric environment |
| CN109297823A (en) * | 2018-10-31 | 2019-02-01 | 山东科技大学 | A kind of experimental rig and test method for simulating mining rock Progressive failure |
| CN109307620A (en) * | 2018-11-29 | 2019-02-05 | 中国地质大学（武汉） | A kind of uniaxial test automatic strain measurement device and method based on computer vision |
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