CN110017764A - It is a kind of difference confining pressure under the conditions of lateral deformation measurement method - Google Patents
It is a kind of difference confining pressure under the conditions of lateral deformation measurement method Download PDFInfo
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- CN110017764A CN110017764A CN201910342359.XA CN201910342359A CN110017764A CN 110017764 A CN110017764 A CN 110017764A CN 201910342359 A CN201910342359 A CN 201910342359A CN 110017764 A CN110017764 A CN 110017764A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—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
- G01N3/12—Pressure testing
Abstract
The present invention relates to the lateral deformation measurement methods under the conditions of a kind of different confining pressures, belong to geotechnical model technical field, and IPC code is E02B 1/02, E02D 33/00.Measurement method of the invention, it is extended bar and other auxiliary devices using left and right, keep lateral deformation measuring system measurement direction orthogonal with vertical loading direction, it can effectively eliminate the influence between vertical direction and horizontal direction, improve measurement accuracy, realizing sample, either in consolidation process, still each measurement point is always same point during vertical loading procedure, sample compressive deformation, overcomes the defect of traditional measurement.Measurement of the invention not only can directly measure cylindrical sample lateral deformation, and can directly measure the lateral deformation of cuboid sample, overcome the shortcomings of to acquire lateral deformation indirectly using conventional method.
Description
Technical field
The present invention relates to the lateral deformation measurement methods under the conditions of a kind of different confining pressures, belong to geotechnical model technical field,
Its IPC code is E02B 1/02, E02D 33/00.
Background technique
The indoor large triaxial test for testing Consolidation Deformation of Soil feature, is generally used cylindrical sample, diameter Ф is
30cm, height H are 60cm or 75cm, carry out applying confining pressure around sample when consolidation test.According to " earthwork test rule "
(SL237-1999) height, area, volume are respectively adopted formula (1)~(3) and are calculated after sample consolidation in, main to assume admittedly
Lateral deformation amount during knot at the different height position of sample is identical, this to assume and actually have certain discrepancy, mainly
The reason is as follows that.
(1) due to the end restraint of upper cap and pedestal to sample both ends on indoor large three-axis mounting, sample consolidation knot
Specimen shape is the small dumbbell shape in the big centre in both ends when beam, is not the cylinder that equivalent reduces.
(2) unevenness of soil body itself is layered anisotropic etc. caused by sample preparation, and sample is not during leading to consolidation test
It is also different with lateral deformation at height.
Therefore, there are certain deviations for sample real area and formula (2) calculated result after consolidation.
Specimen height
hc=h0-Δhc (1)
Area of Sample
Volume of sample
Vc=hcAc (3)
In formula:
h0Sample starting altitude, cm；
V0Sample initial volume, cm3；
ΔhcDeflection is consolidated, is measured by axial displacement, cm；
Δ V- consolidation draining amount, cm3.
During Large-scale Triaxial Experiments, the axial deflection of sample is determined by measurement axial piston relative position,
And Area of Sample is acquired according to formula (2) during triaxial test, but it is it is assumed that sample is different that the formula, which sets up precondition,
Lateral deformation amount at height is identical, has certain discrepancy with sample real area during test, main cause is as follows.
(1) either cylindrical sample or cuboid sample, during Large-scale Triaxial Experiments, due to the work being compressed axially
There is drum type phenomenon with sample middle part.
(2) sample both ends are due to the influence of end restraint, and interface dimensions variation in sample both ends can neglect in shear history
Slightly, using formula (2) calculating area of section and reality, there is any discrepancy.
For cylindrical sample, sample is acquired by the circumferential deformation amount that cyclic deformation device measures cylindrical sample
Area, mainly cyclic deformation instrument is a kind of flexible measuring device, so that it is tightly attached to cylindrical sample rubber by stretching force
Film surface deforms during Large-scale Triaxial Experiments with sample, to measure the circumferential deformation amount of sample, and then is tried
The lateral average deformation of sample.And if its lateral deformation amount is measured using cyclic deformation device for cuboid sample, due to annular
Deformation device can not be tightly attached to the rubber film surface of cuboid sample, so can not accurately measure the lateral deformation of sample.
Summary of the invention
It is an object of the invention to overcome under the conditions of different confining pressures, for existing three axis sample (cylinder) of indoor large
The deficiency that lateral deformation acquires indirectly or three axis sample lateral deformation amount of cuboid can not obtain, it is rectangular to propose that one kind can measure
The method of body sample lateral deformation, while the lateral deformation of normal triaxial sample can be also measured, overcome traditional measurement method to lack
It falls into, provides a kind of new, more reasonable deformation measurement means for geotechnical centrifuge model.The technical solution of the invention is as follows:
It is a kind of difference confining pressure under the conditions of lateral deformation measurement method, comprising the following steps:
One, test prepares
(1) it checks pipeline all inside and outside Large-scale Triaxial Experiments device pressure chamber, should ensure that pipeline is unobstructed, valve is closed certainly
Such as, closed water, gas system should be without leaks, gas leak phenomenon in the case where applying maximum confining pressure；
(2) test rubber membrane used should ensure that intact, no breakage；
(3) confining pressure pressure gauge, axial compressive force sensor and the shaft position sensor that checkout facility uses, are guaranteed at just
Normal working condition.
Two, sample is placed
(1) cuboid sample is prepared, four side appearances of sample answer zero defect, and top and bottom are smooth, measure sample
Physical length, width and height；
(2) using rubber membrane is installed on sample at mould cylinder, rubber membrane is smoothed with hairbrush；
(3) sample for being cased with rubber membrane is placed in the rectangular platform of pedestal, then by the rectangular platform of upper cap
Face is aligned with the top surface of sample；Binding rubber membrane is adjacent to its upper and lower ends with upper cap and pedestal respectively, to prevent from applying confining pressure
When into rubber membrane permeation；Sample is vacuumized, rubber membrane is made to be tightly attached to specimen surface, and checks and whether is leaked at lashing location
Gas.
Three, lateral deformation measuring system is installed
Lateral deformation measuring system is made of measuring device and auxiliary device, and the measuring device includes that resistance-strain type draws
Stretch meter, the right side is extended bar, Zuo Yinshen bar, gag lever post and guide rod, the auxiliary device includes positioning column, locating piece, oval rubber
Blob of viscose, fixed plate, support column, overhanging bar and lifting rope.
Bar is extended on the right side and a left side is extended, and bar is aluminum alloy materials, and section is L shape；The gag lever post, guide rod and positioning
Column is stainless steel material；The material of the fixed plate is steel alloy chromium plating；
The locating piece is the cylinder of diameter 25mm, height 5mm, is equipped with depth 3mm, diameter at the center of cylinder upper surface
The location hole of 2.5mm, cylindrical side set the screw hole there are two 5mm depth, and angle in 90 ° between two screw holes is solid on each screw hole
Surely there is screw；
The circular hole of diameter 2.5mm, depth 30mm are equipped at the different height position of the support column；The overhanging shank diameter is
2mm, length 18cm, one end are inserted into the circular hole of the support column, are fixed on it on support column, and the other end is carved
It is fluted；In the groove, lower end ties up to the centre of the gag lever post for the lifting rope upper end system, for suspending the measurement dress in midair
It sets.
Specific installation steps are as follows:
(1) one paste position of each determination on two opposite sides of sample, using alite paste by two pieces of ellipses
Rubber block is pasted respectively on the rubber membrane at two paste positions, then, is pasted two locating pieces respectively using alite paste
Onto two pieces of oval rubber blocks, and the location hole on two locating pieces is made to be in relative position；In the locating piece
Difference mounting screw in two screw holes；
(2) resistance-strain type extensometer extends bar and the extend rear end of bar of the right side is connect, the left side with left by guide rod
The extend front end of bar and right bar of extending is fixedly connected with a fixed plate respectively, and the gag lever post setting is extended bar on the left side
Bar is extended at rear end with the right side；A positioning column is respectively fixedly connected in described two fixed plates, it will be described two fixed
Position column is placed to the positioning hole on two opposite sides respectively, is twined described two screws and the fixed plate with rubber band
Around together and tensing, make that relative displacement does not occur between the fixed plate and the locating piece；
(3) length of lifting rope is adjusted on the base for the lower end of support column is fixed, make that bar is extended on the left side and the right side is extended bar
In horizontality；
(4) top-operation is repeated, a measurement dress is respectively installed at the position of upper, middle and lower three of two opposite sides
It sets, a measuring device is also respectively installed at the position of upper, middle and lower three of the opposite side of another two, and guarantee six measurements
Device is independent of each other；
(5) data line in measuring device is connected to data collection system, checks whether measuring device is in normal shape
State, and initial displacement value is zeroed.
Four, apply confining pressure
Pressure shield is installed, confining pressure is applied, Large-scale Triaxial Experiments is carried out, measures the lateral deformation of sample.
Further, the sample is cuboid sample, long 30cm, wide 20cm, high 60cm.
Further, 350 Ω of foil gauge resistance value of the resistance-strain type extensometer is exported sensitive for bridge voltage≤6V
2mV/V, four core of output end connector or five cores are spent, the gas pressure of 2MPa can be born.
Measurement method of the invention, has the advantage that
(1) the lateral deformation measuring system used not only can directly measure cylindrical sample lateral deformation, Er Qieke
Directly to measure the lateral deformation of cuboid sample, overcome the shortcomings of to acquire lateral deformation indirectly using conventional method.
(2) measurement method realizes sample either in consolidation process still in vertical loading procedure, and sample compression becomes
Each measurement point is always same point during shape, overcomes the defect of traditional measurement.
(3) device of the lateral deformation can bear the confining pressure of maximum pressure 2MPa, except meeting ordinary triaxial test to enclosing
The requirement of pressure can also meet the soil test that there is particular/special requirement in part, such as large-scale three-axis penetration shearing test.
(4) the lateral deformation measuring system measurement direction used is orthogonal with vertical loading direction, and it is vertical to can effectively eliminate
Influence between direction and horizontal direction improves measurement accuracy.
(5) it is compared with the size of sample (long 30cm, wide 20cm, high 60cm), the lateral deformation that the present invention uses measures system
Unified test accuracy of measurement can reach 0.05mm, and range can achieve the 20% of specimen size, and measurement data is stablized.
(6) single measuring device can be used alone, and each measuring device is mutually indepedent, be independent of each other, and repeatable make
With reducing the cost of scientific research project.
Detailed description of the invention
Fig. 1 is lateral deformation measuring system layout drawing of the invention；
Fig. 2 is the A-A section plan view (not including pedestal and following part) of Fig. 1；
Fig. 3 is the portion the B enlarged drawing of Fig. 2；
Fig. 4 is the bar side view of extending of Fig. 2；
Fig. 5 is the portion the C enlarged drawing of Fig. 4.
Wherein, 1 is data line, and 2 be resistance-strain type extensometer, and 3 extend bar for the right side, and 4 extend bar for a left side, and 5 be gag lever post,
6 be guide rod, and 7 be bolt, and 8 be positioning column, and 9 be locating piece, and 10 be screw, and 11 be oval rubber block A, and 12 be fixed plate,
13 be rubber membrane, and 14 be support column, and 15 be overhanging bar, and 16 be lifting rope, and 17 be pedestal, and 18 be upper cap, and 19 be spherical indenter and work
Stopper rod, 20 be sample.
Specific embodiment
The present invention is described in detail below in conjunction with attached drawing.
Lateral deformation measurement method under the conditions of a kind of different confining pressures of the invention, comprising the following steps:
One, test prepares
(1) pipeline all inside and outside Large-scale Triaxial Experiments device pressure chamber is checked, it is necessary to assure pipeline is unobstructed, and valve is closed
Freely, closed water, gas system should be without leaks, gas leak phenomenon in the case where applying maximum confining pressure (2.0Mpa)；
(2) test rubber membrane 13 used should ensure that intact, no breakage；
(3) confining pressure pressure gauge, axial compressive force sensor and the shaft position sensor that checkout facility uses, are guaranteed at just
Normal working condition.
Two, sample is placed
(1) check that 20 4 side appearances of sample have zero defect, whether top and bottom are smooth, measure cuboid sample 20
Physical length, width and height；The sample 20 that the present embodiment uses is cuboid sample, long 30cm, wide 20cm, high 60cm；
(2) using rubber membrane 13 is installed on sample 20 at mould cylinder, smoothing rubber membrane 13 with hairbrush makes itself and sample 20
It is close to side；
(3) sample 20 for being cased with rubber membrane 13 is placed in the rectangular platform of pedestal 17, then by the length of upper cap 18
Rectangular flat surface is aligned with the top surface of sample 20, adjust sample 20 position so that the centroid of spherical indenter and piston rod 19, on
The centroid of the centroid of cap 18, the centroid of sample 20 and pedestal 17 is overlapped；Binding rubber membrane 13 make its upper and lower ends respectively with upper cap
18 and pedestal 17 be adjacent to, with prevent apply confining pressure when into rubber membrane 13 permeation；Finally sample 20 is vacuumized, makes rubber membrane 13
Be tightly attached to 20 surface of Enough long sample, and check at lashing location whether gas leakage.
Three, lateral deformation measuring system is installed
The lateral deformation measuring system that the present invention uses is made of measuring device and auxiliary device, and the measuring device includes
Resistance-strain type extensometer 2, the right side are extended bar 3, Zuo Yinshen bar 4, gag lever post 5 and guide rod 6, and the auxiliary device includes positioning column
8, locating piece 9, oval rubber block 11, fixed plate 12, support column 14, overhanging bar 15 and lifting rope 16.
The resistance-strain type extensometer 2: 350 Ω of foil gauge resistance value, it is defeated for bridge voltage≤6V (direct current, exchange)
Sensitivity 2mV/V out, four core of output end connector or five cores, can bear the gas pressure of 2MPa.
Bar 3 is extended on the right side and a left side is extended, and bar 4 is aluminum alloy materials, and section is L shape, selects the main mesh of aluminum alloy materials
Be guarantee measuring device quality it is light enough, and L shape section eliminate to greatest extent measurement process or so extend bar itself change
Shape, in order to avoid cause measurement error.
The gag lever post 5 is stainless steel material, and diameter 4mm exceeds resistance for preventing measuring device lateral deformation excessive
The range of Strain Extensometer 2.
The guide rod 6 is stainless steel material, diameter 3mm, for guaranteeing the deformation of entire measuring device in a plane
It is interior, ensure measurement accuracy.
The positioning column 8 is stainless steel material, diameter 5mm, for left and right bar 3,4 of extending to be fixed to the locating piece 9
On location hole on.
The material of the fixed plate 12 is steel alloy chromium plating, controls extend bar 3,4 and the positioning column 8 for connecting.
The locating piece 9 is the cylinder of diameter 25mm, height 5mm, cylinder two surfacings up and down, wherein one side center
Place is equipped with the location hole of depth 3mm, diameter 2.5mm, and cylindrical side sets the screw hole there are two 5mm depth, folder in 90 ° between two screw holes
The screw 10 is fixed at angle on each screw hole.The locating piece 9 uses nylon material, both firm, and quality is again light, and bores
Hole is convenient, and has certain elasticity.
Oval rubber block 11 with a thickness of 3mm, area is slightly larger than locating piece 9, the rubber membrane being pasted onto outside sample 20
Between 13 and locating piece 9, transitional function is played, is fallen off from rubber membrane 13 too early to prevent locating piece 9.
The support column 14, preferably wood materials can also select other satisfactory materials, diameter 30mm, length
100cm, is equipped with diameter 2.5mm on it at different height position, the circular hole of deep 30mm is used to fixed overhanging bar 15.The branch
The lower end of dagger 14 is fixed on the base, and the overhanging bar 15 is plugged in the circular hole at the different height of top.
15 diameter of overhanging bar is 2mm, length 18cm, and one end is inserted into the circular hole of the support column 14, makes
It is fixed on the support column 14, and the other end is carved with groove.In the groove, lower end ties up to institute for the 16 upper end system of lifting rope
The centre for stating gag lever post 5 makes that bar 4 is extended on the left side and the right side 3 holding of bar of extending is horizontal for suspending the measuring device in midair.
Specific installation steps are as follows:
(1) one paste position of each determination on two opposite sides of sample 20, using alite paste by two pieces of ellipses
Shape rubber block 11 is pasted respectively on the rubber membrane 13 at two paste positions, then, recycles alite paste by two locating pieces 9
It is pasted on two pieces of oval rubber blocks 11 respectively, and the location hole on two locating pieces 9 is made to be in relative position (i.e. two
The line of a location hole is vertical with two sides of sample 20)；Mounting screw is distinguished in two screw holes of the locating piece 9
10。
(2) resistance-strain type extensometer 2 extends bar 4 and the extend rear end of bar 3 of the right side is connect, institute with left by guide rod 6
State it is left extend bar 4 and the extend front end of bar 3 of the right side is fixedly connected with a fixed plate 12 respectively, extend bar 4 and the right side on the left side
Gag lever post 5 is arranged in bar 3 of extending at rear end；It is fixedly connected with a positioning column 8 in the fixed plate 12, two are positioned
Column 8 is placed to the positioning hole on two opposite sides respectively, with rubber band by described two screws 10 and the fixed plate
12 are intertwined and tense, and make that relative displacement does not occur between the fixed plate 12 and the locating piece 9, guarantee measured value just
It is the lateral deformation of sample.
Positioning column 8, fixed plate 12 and locating piece 9 are linked together using rubber band, enough fixed forces can be provided
Degree prevents that relative displacement occurs between three, leads to measurement inaccuracy, also avoids measurement caused by other attachment force are spent greatly
Device deformation.
(3) lower end of support column 14 is fixed on the base, overhanging bar 15 is plugged in the circular hole at the different height of top, is hung
Restrict 16 upper ends tie up to it is described overhanging bar 15 on groove in, lower end ties up to the centre of the gag lever post 5, for suspending the measurement in midair
Device adjusts the length of lifting rope 16, makes that bar 4 is extended on the left side and right side bar 3 of extending is in horizontality.
(4) top-operation is repeated, a measurement dress is respectively installed at the position of upper, middle and lower three of two opposite sides
It sets, a measuring device is also respectively installed at the position of upper, middle and lower three of the opposite side of another two, and guarantee six measurements
Device is independent of each other.
(5) data line 1 in measuring device is connected to data collection system, checks whether measuring device is in normal shape
State, and initial displacement value is zeroed.
Four, apply confining pressure
Pressure shield is installed, confining pressure is applied, carries out Large-scale Triaxial Experiments, measures the lateral deformation of sample 20.
Claims (4)
1. lateral deformation measurement method under the conditions of a kind of difference confining pressure, which comprises the following steps:
One, test prepares
(1) it checking pipeline all inside and outside Large-scale Triaxial Experiments device pressure chamber, should ensure that pipeline is unobstructed, valve is closed freely,
Closed water, gas system should be without leaks, gas leak phenomenon in the case where applying maximum confining pressure；
(2) test rubber membrane (13) used should ensure that intact, no breakage；
(3) confining pressure pressure gauge, axial compressive force sensor and the shaft position sensor that checkout facility uses, are guaranteed at normal work
Make state；
Two, sample is placed
(1) it prepares cuboid sample (20), (20) four side appearances of sample answer zero defect, and top and bottom are smooth, measurement examination
Physical length, width and the height of sample (20)；
(2) using rubber membrane (13) is installed on sample (20) at mould cylinder, rubber membrane (13) are smoothed with hairbrush；
(3) sample (20) for being cased with rubber membrane (13) is placed in the rectangular platform of pedestal (17), then by upper cap (18)
Rectangular platform face be aligned with the top surface of sample (20)；Binding rubber membrane (13) make its upper and lower ends respectively with upper cap (18) and
Pedestal (17) is adjacent to, to rubber membrane (13) interior permeation when preventing from applying confining pressure；Sample (20) is vacuumized, rubber membrane (13) are made
Be tightly attached to sample (20) surface, and check at lashing location whether gas leakage；
Three, lateral deformation measuring system is installed
Lateral deformation measuring system is made of measuring device and auxiliary device, and the measuring device includes resistance-strain type extensometer
(2), the right side is extended bar (3), Zuo Yinshen bar (4), gag lever post (5) and guide rod (6), and the auxiliary device includes positioning column (8), fixed
Position block (9), oval rubber block (11), fixed plate (12), support column (14), overhanging bar (15) and lifting rope (16)；
It is aluminum alloy materials that bar (3) is extended on the right side and a left side is extended bar (4), and section is L shape；The gag lever post (5), guide rod
(6) and positioning column (8) is stainless steel material；The material of the fixed plate (12) is steel alloy chromium plating；
The locating piece (9) is the cylinder of diameter 25mm, height 5mm, is equipped with depth 3mm, diameter at the center of cylinder upper surface
The location hole of 2.5mm, cylindrical side set the screw hole there are two 5mm depth, and angle in 90 ° between two screw holes is solid on each screw hole
Surely there are screw (10)；
The circular hole of diameter 2.5mm, depth 30mm are equipped at the different height position of the support column (14)；The overhanging bar (15) is straight
Diameter is 2mm, and length 18cm, described overhanging bar one end is inserted into the circular hole of the support column (14), is fixed on it described
On support column (14), the other end is carved with groove；In the groove, lower end ties up to the gag lever post for lifting rope (16) the upper end system
(5) centre, for suspending the measuring device in midair；
Specific installation steps are as follows:
(1) one paste position of each determination on two opposite sides of sample (20), using alite paste by two pieces of ellipses
Rubber block (11) is pasted respectively on the rubber membrane (13) at two paste positions, then, using alite paste by two locating pieces
(9) it pastes respectively on two pieces of oval rubber blocks (11), and the location hole on two locating pieces (9) is made to be in opposite position
It sets；In two screw holes of the locating piece (9) respectively mounting screw (10)；
(2) resistance-strain type extensometer (2) by guide rod (6) and a left side extends bar (4) and the right side is extended the rear end company of bar (3)
It connects, the front end of bar (4) is extended on the left side and the right side is extended bar (3) is fixedly connected with a fixed plate (12) respectively, the limit
Bar (5) setting extends bar (4) on the left side and the right side is extended at bar (3) close rear end；Divide on described two fixed plates (12)
It is not fixedly connected with a positioning column (8), the location hole described two positioning columns (8) being placed to respectively on two opposite sides
It is interior, described two screws (10) and the fixed plate (12) are intertwined and are tensed with rubber band, make the fixed plate
(12) relative displacement does not occur between the locating piece (9)；
(3) lower end of support column (14) is fixed on the base, adjust the length of lifting rope (16), make the left side extend bar (4) and
Right side bar (3) of extending is in horizontality；
(4) top-operation is repeated, a measuring device is respectively installed at the position of upper, middle and lower three of two opposite sides,
One measuring device is also respectively installed at the position of upper, middle and lower three of the opposite side of another two, and guarantees that six measuring devices are mutual
It does not influence；
(5) data line (1) in measuring device is connected to data collection system, checks whether measuring device is in normal shape
State, and initial displacement value is zeroed；
Four, apply confining pressure
Pressure shield is installed, confining pressure is applied, carries out Large-scale Triaxial Experiments, measures the lateral deformation of sample (20).
2. lateral deformation measurement method under the conditions of a kind of different confining pressures according to claim 1, which is characterized in that the examination
Sample (20) long 30cm, wide (20) cm, high 60cm.
3. lateral deformation measurement method under the conditions of a kind of different confining pressures according to claim 1, which is characterized in that the electricity
350 Ω of foil gauge resistance value for hindering Strain Extensometer (2), for bridge voltage≤6V, output sensitivity 2mV/V, output end connector four
Core or five cores, can bear the gas pressure of 2MPa.
4. lateral deformation measurement method under the conditions of a kind of different confining pressures according to claim 1, which is characterized in that described fixed
Position block (9) is the cylinder of diameter 25mm, height 5mm, and the positioning of depth 3mm, diameter 2.5mm are equipped at the center of cylinder upper surface
Hole, cylindrical side set the screw hole there are two 5mm depth, and angle in 90 ° between two screw holes is fixed with screw on each screw hole
(10)。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116203211A (en) * | 2023-01-06 | 2023-06-02 | 哈尔滨工业大学（深圳） | Film bearing cylinder device suitable for rubber film with guide pipe and application method |
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| CN116203211A (en) * | 2023-01-06 | 2023-06-02 | 哈尔滨工业大学（深圳） | Film bearing cylinder device suitable for rubber film with guide pipe and application method |
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