CN112146961A - Semi-rigid base material tubular cracking test annular test piece compaction forming device - Google Patents
Semi-rigid base material tubular cracking test annular test piece compaction forming device Download PDFInfo
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- CN112146961A CN112146961A CN202011111396.9A CN202011111396A CN112146961A CN 112146961 A CN112146961 A CN 112146961A CN 202011111396 A CN202011111396 A CN 202011111396A CN 112146961 A CN112146961 A CN 112146961A
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- 238000012360 testing method Methods 0.000 title claims abstract description 57
- 238000005056 compaction Methods 0.000 title claims abstract description 37
- 239000000463 material Substances 0.000 title claims abstract description 36
- 238000005336 cracking Methods 0.000 title claims description 18
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 210000002221 olecranon process Anatomy 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 7
- 239000011230 binding agent Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000010426 asphalt Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 240000007651 Rubus glaucus Species 0.000 description 2
- 235000011034 Rubus glaucus Nutrition 0.000 description 2
- 235000009122 Rubus idaeus Nutrition 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 208000032170 Congenital Abnormalities Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 238000007788 roughening Methods 0.000 description 1
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- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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Abstract
The invention relates to the technical field of road engineering pavement material detection, and discloses a tubular crack test annular test piece compaction forming device for a semi-rigid base material, which comprises a mold outer ring, wherein the mold outer ring is connected with a lantern ring outer ring through an outer ring male opening and an outer ring female buckle, a mold inner ring is connected with a lantern ring inner ring through an inner ring male opening and an inner ring female buckle, the lantern ring outer ring and the lantern ring inner ring are arranged on a bottom plate through an outer limiting seat and an inner limiting seat, the whole structure is very stable, a stable annular space can be formed, and the tubular crack test annular test piece compaction forming device is suitable for compaction forming work of the semi-rigid base material Can effectively compact and form the semi-rigid base material.
Description
Technical Field
The invention relates to the technical field of road engineering pavement material detection, in particular to a compaction forming device for a tubular cracking test annular test piece of a semi-rigid base material.
Background
The semi-rigid base layer has the characteristics of good stability, high compressive strength, strong frost resistance, self-made plate body of the structure, low manufacturing cost and the like, so that the semi-rigid base layer becomes the most widely applied base layer structure in the current Chinese highway engineering and plays an important bearing role in the whole pavement structure.
Semi-rigid substrates have also developed their serious congenital defect, cracking, in many years of road engineering applications. In the semi-rigid base asphalt pavement structure, because the semi-rigid base material is a hydraulic material, shrinkage can be generated in the dehydration and drying process, and then shrinkage stress is generated; meanwhile, temperature stress may be generated inside thereof during a temperature change. Cracks can develop in the semi-rigid substrate under the combined effect of the dry shrinkage stress and the temperature stress. The cracks generated by temperature shrinkage and drying shrinkage gradually extend to the upper layer under the comprehensive action of temperature and repeated traffic load, and gradually penetrate through the whole asphalt surface layer to form reflection cracks, so that the structure of the asphalt pavement is finally damaged. Therefore, the detection and research of the temperature and the drying shrinkage characteristics of the semi-rigid base material have important engineering significance for improving the pavement quality and prolonging the service life.
In the current test regulation for inorganic binder stabilizing materials for highway engineering (JTG E51-2009), a research method for the shrinkage and temperature shrinkage characteristics of inorganic binder stabilizing materials is to directly monitor the shrinkage of a beam type test piece in a specific environment by using a dial gauge or a resistance strain gauge. The non-uniformity of the inorganic binder stable material causes that the shrinkage of the part with more fine material content is larger, and the part with more coarse material content is hardly shrunk, so that the result difference of a parallel test piece in the test is larger, and an indirect measurement mode can be considered to be selected to represent the shrinkage characteristic of the inorganic binder stable material.
The pipe cracking test is proposed in ASTM specification, and is currently widely used for testing the shrinkage characteristics of cement concrete. In a tubular cracking test, the strain data of the strain gauge on the surface of the inner ring is continuously read at regular time through the data acquisition unit, so that the purposes of monitoring the change trend and the peak value of the stress of a test piece when the test piece shrinks under the constraint condition of the inner ring are achieved. However, when the tubular cracking test is applied to the shrinkage quality test of the semi-rigid base material, the conventional compaction method and apparatus cannot compact the test piece of the inorganic binder stable material due to the compaction required for forming the test piece and the special shape of the test piece, so that a dedicated compaction forming method is not available at present.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a compaction forming device for a tubular cracking test annular test piece of a semi-rigid base material, which has the advantages of simple structure, accurate monitoring and effective compaction forming of the semi-rigid base material.
(II) technical scheme
In order to realize the purposes of simple structure, accurate monitoring and effective compaction and forming of semi-rigid base materials, the invention provides the following technical scheme: a semi-rigid base material tubular cracking test annular test piece compaction forming device comprises a base, wherein support legs are fixedly mounted at the bottom of the base, stand columns are fixedly mounted on two sides of the base, the top of each stand column is fixedly connected with a cross beam, the bottom of each cross beam is fixedly mounted with a hydraulic rod, the bottom of an output shaft of each hydraulic rod is fixedly connected with an electric pick, and a compaction hammer is fixedly mounted at the bottom of each electric pick;
the inner wall of the base is fixedly connected with an electromechanical box, a cavity is formed in the electromechanical box, a motor is fixedly connected to the inner wall of the cavity, a worm is fixedly connected to the top of an output shaft of the motor, a worm wheel is meshed with the outer wall of the worm, a rotating shaft is fixedly connected to the center of the worm wheel, and a tray is fixedly connected to the top of the rotating shaft;
the bottom plate is installed at the top of tray, the mould outer loop is installed at the top of bottom plate, the both sides fixedly connected with pterygoid lamina of mould outer loop, the lantern ring outer loop has been cup jointed at the top of mould outer loop, the outer wall fixedly connected with of lantern ring outer loop is outer spacing, the inside of mould outer loop is provided with the mould inner ring, the lantern ring inner ring has been cup jointed at the top of mould inner ring, spacing seat in the outer wall fixedly connected with of lantern ring inner ring.
As a preferable technical scheme of the invention, the tail end of the worm is movably connected with a bearing, and the bearing is fixedly connected to the inner side wall of the cavity.
As a preferred technical scheme of the invention, the outer limiting seat and the inner limiting seat are both prismatic tables with one vertical surface and one inclined surface, and the bottom of the outer limiting seat and the bottom of the inner limiting seat are also fixed with rectangular bases with open holes.
As a preferred technical scheme of the invention, the outer wall of the bottom plate is provided with an outer limiting hole and an inner limiting hole, and the positions of the outer limiting hole and the inner limiting hole correspond to the positions of the open holes of the rectangular bases at the bottoms of the outer limiting seat and the inner limiting seat.
As a preferred technical scheme of the invention, olecranon matched with the lantern ring outer ring and the lantern ring inner ring are respectively arranged at the tops of the outer limiting seat and the inner limiting seat, and grooves are respectively formed on inclined surfaces of the outer limiting seat and the inner limiting seat.
As a preferred technical scheme of the present invention, an outer ring male opening is arranged at the top of the outer ring of the mold, an outer ring female opening matched with the outer ring male opening is arranged at the bottom of the outer ring of the lantern ring, an inner ring male opening is arranged at the top of the inner ring of the mold, and an inner ring female buckle matched with the inner ring male opening is arranged at the bottom of the inner ring of the lantern ring.
As a preferred technical scheme of the present invention, a force sensor is disposed inside the hydraulic rod, laser displacement sensors are disposed on upper and lower sides of the electric pick, a control circuit board is disposed inside the electromechanical box, and output ends of the force sensor and the laser displacement sensors are electrically connected to an input end of the control circuit board.
(III) advantageous effects
Compared with the prior art, the invention provides a compaction forming device for a tubular cracking test annular test piece of a semi-rigid base material, which has the following beneficial effects:
according to the compaction forming device for the tubular cracking test annular test piece of the semi-rigid base material, the outer ring of the die is connected with the outer ring of the lantern ring through the outer ring male port and the outer ring female buckle, the inner ring of the die is connected with the inner ring of the lantern ring through the inner ring male port and the inner ring female buckle, the outer ring of the lantern ring and the inner ring of the lantern ring are arranged on the bottom plate through the outer limiting seat and the inner limiting seat, the whole structure is very stable, a stable annular space can be formed, and the compaction forming device is suitable for compaction forming work of the semi;
the motor, the worm wheel and the rotating shaft can provide power for the tray in the compaction process, and the tray is controlled to rotate and be locked, so that the compaction hammer can be compacted at any position, and the control is simpler and more convenient;
the laser displacement sensor is used for monitoring the vertical position of the electric pick and the distance between the electric pick and the surface of a test piece in real time, calculating the height of hitting the real-time test piece, providing basis for the control system to judge the height of the test piece, and the force sensor is used for monitoring the output force of the hydraulic rod in real time, providing feedback for servo control of the control system, hitting more accurately, having good monitoring effect, and effectively hitting semi-rigid base materials to be solid and shaped.
Drawings
FIG. 1 is a schematic view of a base part according to the present invention;
FIG. 2 is a schematic structural view of an outer ring portion of the mold of the present invention;
FIG. 3 is a top view of a portion of the outer ring of the mold of the present invention;
FIG. 4 is a top plan view of a portion of the base plate of the present invention;
FIG. 5 is a bottom view of a base portion of the present invention;
fig. 6 is a partial cross-sectional view of the motor case of the present invention.
In the figure: 1-base, 2-support leg, 3-upright column, 4-cross beam, 5-hydraulic rod, 6-electric pick, 7-compaction hammer, 8-tray, 9-bottom plate, 10-mould outer ring, 11-lantern ring outer ring, 12-outer limit seat, 13-wing plate, 14-mould inner ring, 15-lantern ring inner ring, 16-inner limit seat, 17-outer limit hole, 18-inner limit hole, 19-electromechanical box, 20-cavity, 21-motor, 22-worm, 23-worm wheel, 24-rotating shaft and 25-control circuit board.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be 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.
Referring to fig. 1-6, a semi-rigid base material tubular cracking test annular test piece compaction forming device comprises a base 1, wherein a support leg 2 is fixedly installed at the bottom of the base 1, vertical columns 3 are fixedly installed at two sides of the base 1, the tops of the vertical columns 3 are fixedly connected with a cross beam 4, a hydraulic rod 5 is fixedly installed at the bottom of the cross beam 4, an electric pick 6 is fixedly connected to the bottom of an output shaft of the hydraulic rod 5, and a compaction hammer 7 is fixedly installed at the bottom of the electric pick 6;
the inner wall of the base 1 is fixedly connected with an electric box 19, a cavity 20 is formed in the electric box 19, the inner wall of the cavity 20 is fixedly connected with a motor 21, the top of an output shaft of the motor 21 is fixedly connected with a worm 22, the outer wall of the worm 22 is meshed with a worm wheel 23, the center of the worm wheel 23 is fixedly connected with a rotating shaft 24, and the top of the rotating shaft 24 is fixedly connected with a tray 8;
In this embodiment, the end of the worm 22 is movably connected with a bearing, the bearing is fixedly connected to the inner side wall of the cavity 20, and the rotation of the worm 22 is limited by the bearing, so that the rotation of the worm 22 is more stable.
In this embodiment, the outer limit seat 12 and the inner limit seat 16 are both prismatic platforms with one vertical surface and one inclined surface, and the bottom of the outer limit seat and the bottom of the inner limit seat are fixed with rectangular bases with open holes for connecting with bolts between the bottom plates 9.
In this embodiment, the outer wall of the bottom plate 9 is provided with an outer limiting hole 17 and an inner limiting hole 18, and the positions of the outer limiting hole 17 and the inner limiting hole 18 correspond to the positions of the open holes of the rectangular bases at the bottoms of the outer limiting seat 12 and the inner limiting seat 16.
In this embodiment, the tops of the outer limit seat 12 and the inner limit seat 16 are respectively provided with olecranon matching with the lantern ring outer ring 11 and the lantern ring inner ring 15, so as to fix the whole formed by the mold outer ring 10 and the lantern ring outer ring 11 or the mold inner ring 14 and the lantern ring inner ring 15, provide vertical constraint for the whole, and grooves are formed in the inclined surfaces of the outer limit seat 12 and the inner limit seat 16, so that the production cost and the weight of the whole can be reduced on the premise of not influencing the strength of the outer limit seat 12 and the inner limit seat 16.
In this embodiment, the top of the mold outer ring 10 is provided with an outer ring male opening, the bottom of the collar outer ring 11 is provided with an outer ring female opening matched with the outer ring male opening, the top of the mold inner ring 14 is provided with an inner ring male opening, the bottom of the collar inner ring 15 is provided with an inner ring female buckle matched with the inner ring male opening, the mold outer ring 10 and the collar outer ring 11 or the mold inner ring 14 and the collar inner ring 15 are combined with each other in a male and female opening manner to form displacement limitation in the horizontal direction, in addition, the collar outer ring 11 (collar inner ring 15), the mold outer ring 10 (mold inner ring 14) and the bottom plate 9 are tightly fixed through the outer limit seat 12 and the inner limit seat 16 and the olecranon the top thereof, and the three form a stable annular space.
In this embodiment, the inside of hydraulic stem 5 is provided with force sensor for the size of real time monitoring hydraulic stem 5 output power provides the feedback for control system's servo control, the upper and lower both sides of electric pick 6 respectively are provided with laser displacement sensor, be used for the distance of real time supervision electric pick 6 vertical position and electric pick 6 and test piece surface, calculate out the height of hitting the real-time test piece, judge the test piece height for control system and provide the basis, the inside of electromechanical case 19 is provided with control circuit board 25, force sensor and laser displacement sensor's output and control circuit board 25's input electric connection.
In this embodiment, the control circuit board 25 is responsible for reading and judging the states of the components of the device, and controlling all the works such as compaction, rotation, ascending and descending after the mold is filled, the control system is based on a control system customized by raspberry dispatching hardware and a Linux (Debian 10) system, a program written by Python assembly language is used, data are read from the sensors and the control panel through GPIO (general purpose input/output) interaction pins carried by the raspberry dispatching board, and an instruction (electric signal) is sent to the control circuit board 25, so that the automation of the whole set of instrument is realized.
In this embodiment, the compaction hammer 7 is composed of a connecting rod and a fan-shaped hammer head, wherein the upper end of the connecting rod is connected with the electric pick 6 through a round double-pit double-groove standard interface, and the lower end of the connecting rod is connected with the hammer head through a thread.
In this embodiment, the cross beam 4 is made of steel with an i-shaped cross section, which greatly improves the bending strength and the shearing strength of the cross beam 4.
In this embodiment, the wing plate 13 is composed of two split connecting plates, and the two split connecting plates are connected by a mounting bolt.
The working principle and the using process of the invention are as follows:
firstly, mounting, referring to fig. 1 and 2, firstly, placing a bottom plate 9 on a tray 8 (the connecting bolt between the bottom plate 9 and the tray 8 is not screwed temporarily, otherwise, the position of the connecting bolt is difficult to adjust in the later step), then placing an inner mold ring 14 and an outer mold ring 10 on the bottom plate 9, adjusting the positions of the inner mold ring 14 and the outer mold ring 10 according to the mark on the bottom plate 9, enabling the inner edges of the inner mold ring 14 and the outer mold ring 10 to be matched with the mark, and mounting bolts on a wing plate 13 of the outer mold ring 10 to fix two split connecting plates; then, installing a lantern ring inner ring 15 and a lantern ring outer ring 11 on the die inner ring 14 and the die outer ring 10, specifically, connecting an inner ring male opening with an inner ring female opening, connecting an outer ring male opening with an outer ring female opening, and finally respectively installing an outer limiting seat 12 and an inner limiting seat 16 to add constraints for all parts;
secondly, adjusting the overall position of the bottom plate 9, when adjusting the position, firstly controlling the hydraulic rod 5 to descend to enable the electric pick 6 and the compaction hammer 7 to descend to a certain height, tightly attaching one right-angle side of the right-angle steel ruler to the top surface of the inner ring 15 of the lantern ring by means of the right-angle steel ruler, enabling the other right-angle side to be flush with the outer surface of the inner ring 15 of the lantern ring and be vertical to the whole mould, adjusting the horizontal position of the mould to enable the distance between the right-angle side of the steel ruler vertical to the whole mould and the inner edge of the hammer head to be as small as possible, then rotating the tray 8 for ninety degrees to continue to adjust until four points on the inner ring 15 of the lantern ring meet the requirements;
loading and compacting, coating a proper amount of release agent in the annular space, uniformly spreading one third of the mixture with the pre-calculated test piece mass in a mold, carrying out preliminary tamping, controlling the hydraulic rod 5 to operate to enable the pressure of the hydraulic rod to be 100N (monitored by a force sensor) during tamping, then starting to vibrate and compact the test piece, continuously reading data by two laser displacement sensors above and below the electric pick 6, and closing the compacting electric pick and enabling the hydraulic rod 5 to ascend when the compacting height meets the requirement; then controlling the motor 21 to operate to enable the worm 22 to rotate, enabling the worm 22 to rotate to drive the worm wheel 23 meshed with the outer wall of the worm 22 to rotate, further driving the tray 8 to rotate through the rotating shaft 24, enabling the tray 8 to rotate for a certain angle, controlling the hydraulic rod 5 to extend until the pressure reaches 100N again, and starting compaction; and (3) after 30 times of compaction, completing compaction work of the first layer of the test piece, roughening the surface of the test piece, and then completing compaction work of the 2 nd layer material and the 3 rd layer material in the same way.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a forming device is hit to experimental annular test piece of semi-rigid base material tubular fracture, includes base (1), its characterized in that: the bottom of the base (1) is fixedly provided with support legs (2), two sides of the base (1) are fixedly provided with stand columns (3), the tops of the stand columns (3) are fixedly connected with a cross beam (4), the bottom of the cross beam (4) is fixedly provided with a hydraulic rod (5), the bottom of an output shaft of the hydraulic rod (5) is fixedly connected with an electric pick (6), and the bottom of the electric pick (6) is fixedly provided with a compaction hammer (7);
the inner wall of the base (1) is fixedly connected with an electromechanical box (19), a cavity (20) is formed in the electromechanical box (19), the inner wall of the cavity (20) is fixedly connected with a motor (21), the top of an output shaft of the motor (21) is fixedly connected with a worm (22), the outer wall of the worm (22) is meshed with a worm wheel (23), the center of the worm wheel (23) is fixedly connected with a rotating shaft (24), and the top of the rotating shaft (24) is fixedly connected with a tray (8);
bottom plate (9) are installed at the top of tray (8), mould outer ring (10) are installed at the top of bottom plate (9), both sides fixedly connected with pterygoid lamina (13) of mould outer ring (10), lantern ring outer ring (11) have been cup jointed at the top of mould outer ring (10), spacing seat (12) outside the outer wall fixedly connected with of lantern ring outer ring (11), the inside of mould outer ring (10) is provided with mould inner ring (14), lantern ring inner ring (15) have been cup jointed at the top of mould inner ring (14), spacing seat (16) in the outer wall fixedly connected with of lantern ring inner ring (15).
2. The tubular cracking test annular test piece compaction forming device for the semi-rigid base material according to claim 1, wherein: the tail end of the worm (22) is movably connected with a bearing, and the bearing is fixedly connected to the inner side wall of the cavity (20).
3. The tubular cracking test annular test piece compaction forming device for the semi-rigid base material according to claim 1, wherein: the outer limiting seat (12) and the inner limiting seat (16) are all prismatic tables with one vertical surface and one inclined surface, and rectangular bases with open holes are fixed at the bottoms of the prismatic tables.
4. The tubular cracking test annular test piece compaction forming device for the semi-rigid base material according to claim 3, wherein: the outer wall of the bottom plate (9) is provided with an outer limiting hole (17) and an inner limiting hole (18), and the positions of the outer limiting hole (17) and the inner limiting hole (18) correspond to the positions of the rectangular base open holes at the bottoms of the outer limiting seat (12) and the inner limiting seat (16).
5. The tubular cracking test annular test piece compaction forming device for the semi-rigid base material according to claim 3, wherein: the top of the outer limiting seat (12) and the top of the inner limiting seat (16) are respectively provided with an olecranon matched with the lantern ring outer ring (11) and the lantern ring inner ring (15), and inclined planes of the outer limiting seat (12) and the inner limiting seat (16) are respectively provided with a groove.
6. The tubular cracking test annular test piece compaction forming device for the semi-rigid base material according to claim 1, wherein: the top of mould outer ring (10) is provided with the public mouth of outer loop, the bottom of lantern ring outer loop (11) is provided with the female mouth of outer loop with the public mouthful assorted outer loop of outer loop, the top of mould inner ring (14) is provided with the public mouth of inner loop, the bottom of lantern ring inner ring (15) is provided with the female knot of the public mouthful assorted inner loop of inner loop.
7. The tubular cracking test annular test piece compaction forming device for the semi-rigid base material according to claim 1, wherein: the hydraulic pressure pole (5) inside sets up force sensor, the upper and lower both sides of electric pick (6) respectively are provided with laser displacement sensor, the inside of electromechanical case (19) is provided with control circuit board (25), force sensor and laser displacement sensor's output and control circuit board (25)'s input electric connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011111396.9A CN112146961A (en) | 2020-10-16 | 2020-10-16 | Semi-rigid base material tubular cracking test annular test piece compaction forming device |
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| CN202011111396.9A CN112146961A (en) | 2020-10-16 | 2020-10-16 | Semi-rigid base material tubular cracking test annular test piece compaction forming device |
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| CN205497628U (en) * | 2016-04-14 | 2016-08-24 | 吉林大学 | Positioner is used in cutting of sound absorption softwood material |
| CN206671063U (en) * | 2017-03-31 | 2017-11-24 | 浙江亚厦装饰股份有限公司 | A kind of composite continuous damage performance test fixture |
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