CN112461686A - Protection and positioning loading device for SHPB disc test piece and test method - Google Patents
Protection and positioning loading device for SHPB disc test piece and test method Download PDFInfo
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- CN112461686A CN112461686A CN202011545370.5A CN202011545370A CN112461686A CN 112461686 A CN112461686 A CN 112461686A CN 202011545370 A CN202011545370 A CN 202011545370A CN 112461686 A CN112461686 A CN 112461686A
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- 238000012360 testing method Methods 0.000 title claims abstract description 92
- 238000010998 test method Methods 0.000 title claims description 7
- 239000012634 fragment Substances 0.000 claims abstract description 36
- 230000001681 protective effect Effects 0.000 claims abstract description 31
- 230000000007 visual effect Effects 0.000 claims abstract description 12
- 238000009863 impact test Methods 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 35
- 239000010959 steel Substances 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 abstract description 6
- 239000011435 rock Substances 0.000 description 10
- 230000006378 damage Effects 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 230000005476 size effect Effects 0.000 description 1
- 210000003781 tooth socket Anatomy 0.000 description 1
- 239000012780 transparent material Substances 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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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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
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0258—Non axial, i.e. the forces not being applied along an axis of symmetry of the specimen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0266—Cylindrical specimens
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Abstract
用于SHPB圆盘试件的防护与定位加载装置，包括基座、调高支架、碎块收纳箱和透明防护罩，基座固定于SHPB设备底座的导轨上，碎块收纳箱底部固定在基座上，碎块收纳箱顶部敞口，透明防护罩底部敞口，透明防护罩底部设置在碎块收纳箱顶部形成全封闭式可视化防护结构，调高支架下端固定在基座中心，调高支架上部向上穿过碎块收纳箱的箱底伸入到全封闭式可视化防护结构内部。本发明配合SHPB设备使用，能够对不同尺寸圆盘试件精准定位，减少试验误差，防止试件碎块崩射且便于对试件进行观察，很大程度上提高SHPB冲击试验的准确性和安全性，对于降低脆性材料SHPB冲击试验的危险性，减少试验误差具有重要意义。
The protection and positioning loading device for SHPB disc specimens, including base, height-adjusting bracket, fragment storage box and transparent protective cover, the base is fixed on the guide rail of the SHPB equipment base, and the bottom of the fragment storage box is fixed on the base. On the seat, the top of the fragment storage box is open, the bottom of the transparent protective cover is open, and the bottom of the transparent protective cover is set on the top of the fragment storage box to form a fully enclosed visual protection structure. The lower end of the height-adjusting bracket is fixed at the center of the base, and the height-adjusting bracket The upper part extends upward through the bottom of the fragment storage box and extends into the interior of the fully enclosed visual protection structure. When used in conjunction with SHPB equipment, the present invention can accurately locate disc specimens of different sizes, reduce test errors, prevent specimen fragments from collapsing, facilitate observation of specimens, and greatly improve the accuracy and safety of SHPB impact tests. It is of great significance to reduce the risk of SHPB impact test of brittle materials and reduce the test error.
Description
Technical Field
The invention belongs to the technical field of impact dynamics tests, and particularly relates to a protection and positioning loading device and a test method for an SHPB disc test piece.
Background
With the development of underground mining, blasting construction and explosion-proof and shockproof engineering, research on dynamic destruction characteristics of rock mass is more and more concerned, and to understand the dynamic destruction mechanism of rock mass, firstly, the dynamic destruction mechanical parameters of rock are measured by using Split Hopkinson Pressure Bar (SHPB) equipment, abbreviated as SHPB, and the SHPB test is widely applied to research on dynamic performance parameters of rock materials at present. The tensile strength of the rock mass is much lower than the compressive strength and the shear strength, so the dynamic tensile strength test of the rock is particularly important. The international rock mechanics society recommends that the Brazilian disc test piece is used for testing the dynamic tensile strength of the rock, and researches show that the dynamic mechanical parameter test value of the rock has a size effect, while SHPB contrast tests of disc test pieces with different sizes have a plurality of problems to cause test errors. In the SHPB impact compression test, a friction force between a pressure bar and a test piece is generally used to sandwich the test piece between an incident bar and a transmission bar, or the test piece is fixed by an adhesive material such as grease. However, in a dynamic splitting test using a disc test piece, the contact surface between the test piece and the pressure lever is very small, and it is difficult to realize the loading of the central axis of the pressure lever and the coincidence of the loading diameter direction of the disc. The center alignment is achieved by naked eyes, which causes great test errors. When the specimen size is large, neither friction nor adhesion is sufficient to hold the specimen between the incident rod and the transmission rod. If the test piece and the pressure rod are not coincident in the test, or the test piece slides in the loading process, the influence on the test result cannot be estimated. In addition, the rock test piece belongs to fragile material, and when impact velocity was great, the fragment was violently jettisoned when the test piece destroyed, and experimental operating personnel had the risk of injury, also received the damage easily if adopt high-speed camera monitoring test piece to destroy process equipment.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a protection and positioning loading device and a test method for an SHPB disc test piece, which can flexibly adjust the supporting height of the test piece, ensure that the disc test pieces with different sizes are accurately centered with a compression bar, and realize totally-enclosed visual protection operation in the test process.
In order to solve the technical problems, the invention adopts the following technical scheme: a protection and location loading device for SHPB disc test piece, which comprises a base, heighten the support, fragment containing box and transparent protection casing, the base is fixed in on the guide rail of SHPB equipment base, fragment containing box bottom is fixed on the base, fragment containing box top is uncovered, transparent protection casing bottom sets up and forms the visual protective structure of totally enclosed at fragment containing box top, heighten the support lower extreme and fix at the base center, heighten inside the bottom of the case that support upper portion upwards passed fragment containing box and stretched into the visual protective structure of totally enclosed.
The base is of a groove plate structure with an open bottom and a through left side and a right side, U-shaped openings are respectively arranged in the middle positions of the left side edge and the right side edge of the base, connecting bolts penetrate through the two U-shaped openings to be connected with a guide rail of an SHPB equipment base, leveling screws are respectively in threaded connection with four corners of the base, two supporting plates are arranged in front of and behind the upper surface of the base at intervals, the two supporting plates are vertically arranged along the left and right directions, and the lower side edges of the two supporting plates are fixedly connected to the upper surface; the bottom of the fragment containing box is fixedly connected with the upper side edges of the two support plates.
The height-adjusting support comprises two vertical channel steel guide rails, a lifting support plate, a cushion table, a coarse-adjusting lifting driving mechanism and a fine-adjusting lifting driving mechanism, the lower ends of the two vertical channel steel guide rails are fixedly connected to the upper surface of the base, the two vertical channel steel guide rails are arranged at intervals left and right and are oppositely arranged on the opening side, the lifting support plate is vertically inserted into grooves of the two vertical channel steel guide rails, and the cushion table is horizontally arranged on the upper side edge of the lifting support plate; a group of thick tooth grooves and a group of thin tooth grooves are vertically arranged between the two vertical channel steel guide rails on the front side face or the rear side face of the lifting support plate, locking screws are connected to the front side or the side portions of the vertical channel steel guide rails in a threaded mode, and the inner ends of the locking screws are in compression joint fit with the lifting support plate.
The coarse adjustment lifting driving mechanism comprises a coarse driving shaft, a large gear and a coarse adjustment knob, the coarse driving shaft is horizontally arranged along the front-back direction, the front end and the rear end of the coarse driving shaft are respectively and rotatably connected to the supporting plates on the front side and the rear side, the large gear is installed on the coarse driving shaft and is meshed with the coarse tooth grooves, and the coarse adjustment knob is installed at the front end part of the coarse driving shaft.
The fine adjustment lifting driving mechanism comprises a fine driving shaft, a pinion and a fine adjustment knob, the fine driving shaft is horizontally arranged along the front-back direction, the front end and the back end of the fine driving shaft are respectively and rotatably connected to the supporting plates on the front side and the back side, the pinion is installed on the fine driving shaft and meshed with the fine tooth grooves, and the fine adjustment knob is installed at the front end part of the fine driving shaft.
Vertical channel-section steel guide rail is last along vertical scale that is equipped with, fills up the horizontal scale that bench surface was equipped with along controlling the horizontal direction, fills up the bench and has inlayed the surveyor's level.
The top of the transparent protective cover is of an arch structure, the lower part of the middle of the left end surface and the right end surface of the transparent protective cover is provided with an opening and closing door, and a rod penetrating hole is arranged above the opening and closing door.
The test method for the protection and positioning loading device of the SHPB disc test piece comprises the following steps:
the method comprises the following steps: firstly, clamping a base on a guide rail of an SHPB device base, screwing a leveling screw and observing a leveling instrument until a cushion table is horizontal, and then fixing the base on the SHPB device base through a U-shaped opening by using a connecting bolt;
step two: the supporting height matched with the size of the test piece is calculated in advance,
whereinh 1In order to support the height of the support,Hthe height from the center of the pressure lever to the base of the SHPB device,Ris the radius of the disc specimen,h 2the thickness of the cushion table is used as the thickness of the cushion table,h 3is to ascendThe height of the support plate is reduced,bis the base plate thickness of the base;
step three: the coarse adjustment knob is held by a hand to drive the coarse driving shaft to rotate, the large gear on the coarse driving shaft drives the meshed coarse gear groove to enable the lifting support plate to move upwards along the two vertical channel steel guide rails, a vertical graduated scale on the vertical channel steel guide rails is observed, the lifting support plate is enabled to ascend to a position close to the supporting height, then the fine adjustment knob is held by the hand to drive the fine driving shaft to rotate, the small gear on the fine driving shaft drives the meshed fine gear groove to enable the lifting support plate to move upwards or downwards along the two vertical channel steel guide rails until the upper surface of the cushion table is adjusted to the accurate supporting height, and then the locking screw is screwed down to enable the lifting support plate and the two vertical channel steel guide;
step four: placing a disc-shaped test piece on a cushion table, ensuring that the test piece is placed in the center of the cushion table according to a horizontal graduated scale on the upper surface of the cushion table, and finally pressing the left side surface and the right side surface of the test piece tightly by using an incident rod and a transmission rod of an SHPB device;
step five: opening an opening and closing door of the transparent protective cover, placing the bottom of the transparent protective cover on the fragment containing box, enabling the incident rod and the transmission rod to be right in the rod penetrating hole, fixing the transparent protective cover and the fragment containing box together through a fixing bolt, and finally closing the opening and closing door;
step six: starting an SHPB device, performing an impact test on the test piece, and observing the whole process of impact on the test piece through a transparent protective cover; the test piece falls to the fragment containing box bottom at transparent protection casing's the blockking after being broken.
By adopting the technical scheme, the invention has the following beneficial effects:
1) according to the invention, the height-adjusting support is controlled to lift through a gear and a tooth socket (rack), coarse adjustment and fine adjustment are designed, accurate and quick positioning is realized in height, the test piece is accurately positioned in the horizontal direction by the vertical channel steel guide rail and the horizontal graduated scale on the cushion table, centering of the test pieces with different sizes and the compression bar is ensured, stress dispersion caused by non-centering impact is avoided, and the SHPB test error is greatly reduced.
2) The transparent protective cover is made of an explosion-proof scratch-proof transparent material, so that not only can testing personnel be protected from being injured, but also the test piece can be clearly observed and recorded in a close range by adopting non-contact monitoring equipment, and the safety of an SHPB test is guaranteed.
3) The totally enclosed design of the invention is beneficial to the fragment collection of the test piece and the subsequent analysis such as fragment granularity grading.
4) According to the visual protector in location of design can realize not unidimensional test piece and depression bar centering, avoid because the stress dispersion that non-centering strikes and cause, greatly reduced SHPB test error, can improve experimental security again, be favorable to the operation of testing personnel safety, improve test efficiency.
In conclusion, the invention develops a protection device which is matched with an SHPB device for use, can accurately position disc test pieces with different sizes, reduces test errors, prevents broken pieces of the test pieces from being shot and is convenient for observing the test pieces. According to the device and the method, the test piece positioning and visual protection device is matched with the SHPB device for use, so that not only can accurate centering of disk test pieces with different sizes and an SHPB pressure rod be realized, the problem of stress wave dispersion effect on the pressure rod caused by eccentric impact in an SHPB test be solved, but also the totally-enclosed visual protection of a test piece loading position is realized, the safety of testing personnel is ensured, and the change process of the test piece in the test can be conveniently and effectively monitored by the visual device. The application of the method can improve the accuracy and safety of the SHPB impact test to a great extent, and has important significance for reducing the danger of the SHPB impact test of the brittle material and reducing the test error.
Drawings
Fig. 1 is a schematic perspective view of the device of the present invention.
FIG. 2 is a front view of the apparatus of the present invention in a large specimen support test.
FIG. 3 is a front view of the apparatus of the present invention in a support test of a small test piece.
Fig. 4 is a schematic perspective view of the device of the present invention with the transparent protective cover removed.
Fig. 5 is a schematic perspective view of a base of the device of the present invention.
Fig. 6 is a schematic perspective view of the height-adjustable support.
Fig. 7 is a schematic perspective view of the transparent protective cover.
Detailed Description
As shown in fig. 1-7, the protection and positioning loading device for the SHPB disc test piece of the invention comprises a base 1, a heightening bracket 2, a fragment containing box 3 and a transparent protective cover 4, wherein the base 1 is fixed on a guide rail of a base of an SHPB device, the bottom of the fragment containing box 3 is fixed on the base 1, the top of the fragment containing box 3 is open, the bottom of the transparent protective cover 4 is arranged at the top of the fragment containing box 3 to form a fully-closed visual protection structure, the lower end of the heightening bracket 2 is fixed at the center of the base 1, and the upper part of the heightening bracket 2 upwards penetrates through the bottom of the fragment containing box 3 and extends into the fully.
The base 1 is a trough plate structure with an open bottom and a through left side and a right side, U-shaped openings 1-a are respectively arranged in the middle positions of the left side and the right side of the base 1, two U-shaped openings 1-a penetrate through connecting bolts to be connected with a guide rail of an SHPB equipment base, leveling screws 1-c are respectively in threaded connection with four corners of the base 1, two supporting plates 1-b are arranged on the front and back of the upper surface of the base 1 at intervals, the two supporting plates 1-b are vertically arranged along the left and right directions, and the lower sides of the two supporting plates 1-b are fixedly connected to the upper surface of the base 1; the bottom of the fragment containing box 3 is fixedly connected with the upper side edges of the two support plates 1-b.
The height-adjusting support 2 comprises two vertical channel steel guide rails 2-a, two lifting support plates 2-b, a cushion table 2-c, a coarse adjustment lifting driving mechanism and a fine adjustment lifting driving mechanism, the lower ends of the two vertical channel steel guide rails 2-a are fixedly connected to the upper surface of the base 1, the two vertical channel steel guide rails 2-a are arranged at intervals left and right, the opening sides of the two vertical channel steel guide rails are arranged oppositely, the lifting support plates 2-b are vertically inserted into grooves of the two vertical channel steel guide rails 2-a, and the cushion table 2-c is horizontally arranged on the upper side edges of the lifting support plates 2-b; a group of thick tooth grooves 21 and a group of thin tooth grooves 22 are vertically arranged on the front side surface or the rear side surface of the lifting support plate 2-b between the two vertical channel steel guide rails 2-a, locking screws 2-g are connected to the front side or the side part of each vertical channel steel guide rail 2-a in a threaded mode, and the inner ends of the locking screws 2-g are in compression joint fit with the lifting support plate 2-b.
The coarse adjustment lifting driving mechanism comprises a coarse driving shaft 23, a large gear 24 and coarse adjustment knobs 2-d, the coarse driving shaft 23 is horizontally arranged along the front and back direction, the front end and the back end of the coarse driving shaft 23 are respectively and rotatably connected to the front side and the back side of the supporting plate 1-b, the large gear 24 is installed on the coarse driving shaft 23 and meshed with the coarse tooth grooves 21, and the coarse adjustment knobs 2-d are installed at the front end part of the coarse driving shaft 23.
The fine adjustment lifting driving mechanism comprises a fine driving shaft 25, a pinion 26 and a fine adjustment knob 2-e, wherein the fine driving shaft 25 is horizontally arranged along the front-back direction, the front end and the back end of the fine driving shaft 25 are respectively and rotatably connected to the front side and the back side of the supporting plate 1-b, the pinion 26 is arranged on the fine driving shaft 25 and meshed with the fine tooth groove 22, and the fine adjustment knob 2-e is arranged at the front end part of the fine driving shaft 25.
A vertical graduated scale is vertically arranged on the vertical channel steel guide rail 2-a, a horizontal graduated scale is arranged on the upper surface of the pad table 2-c along the left and right horizontal directions, and a level 2-f is embedded on the pad table 2-c.
The top of the transparent protective cover 4 is of an arch structure, the lower part of the middle of the left end surface and the right end surface of the transparent protective cover 4 is provided with an opening and closing door 6, and a rod penetrating hole 61 is arranged above the opening and closing door 6.
The test method for the protection and positioning loading device of the SHPB disc test piece comprises the following steps:
the method comprises the following steps: firstly, clamping a base 1 on a guide rail of a SHPB device base, screwing leveling screws 1-c and observing a level gauge 2-f until a cushion table 2-c is horizontal, and then fixing the base 1 on the SHPB device base through a U-shaped opening 1-a by using a connecting bolt;
step two: the support height matching the size of the test piece 9 is calculated in advance,
whereinh 1In order to support the height of the support,Hthe height from the center of the pressure lever to the base of the SHPB device,Ris the radius of the disc specimen,h 2the thickness of the cushion table 2-c,h 3in order to raise and lower the height of the supporting plate 2-b,bis the bottom plate thickness of the base 1;
step three: the coarse adjustment knob 2-d is held by hand to drive the coarse drive shaft 23 to rotate, the large gear 24 on the coarse drive shaft 23 drives the engaged coarse tooth groove 21 to enable the lifting support plate 2-b to move upwards along the two vertical channel steel guide rails 2-a, the vertical graduated scale on the vertical channel steel guide rails 2-a is observed to enable the lifting support plate 2-b to rise to a position close to the supporting height, then the fine adjustment knob 2-e is held by hands to drive the fine drive shaft 25 to rotate, the pinion 26 on the fine drive shaft 25 drives the meshed fine tooth groove 22 to enable the lifting support plate 2-b to move upwards or downwards along the two vertical channel steel guide rails 2-a until the upper surface of the cushion table 2-c is adjusted to the accurate support height, then screwing down the locking screws 2-g to connect the lifting support plate 2-b and the two vertical channel steel guide rails 2-a into a whole;
step four: placing a disc-shaped test piece 9 on a pad table 2-c, ensuring that the test piece 9 is placed at the center of the pad table 2-c according to a horizontal scale on the upper surface of the pad table 2-c, and finally pressing the left side surface and the right side surface of the test piece 9 by using an incident rod 7 and a transmission rod 8 of an SHPB device;
step five: opening an opening and closing door 6 of the transparent protective cover 4, placing the bottom of the transparent protective cover 4 on the fragment containing box 3, enabling the incident rod 7 and the transmission rod 8 to be just in the rod penetrating hole 61, fixing the transparent protective cover 4 and the fragment containing box 3 together by using a fixing bolt 5, and finally closing the opening and closing door 6;
step six: starting the SHPB device, performing an impact test on the test piece 9, and observing the whole process of impact on the test piece 9 through the transparent protective cover 4; the test piece 9 is broken and falls to the bottom of the fragment containing box 3 under the blocking of the transparent protective cover 4.
The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (8)
1. A protection and location loading device for SHPB disc test piece, its characterized in that: including the base, heighten the support, fragment containing box and transparent protection casing, the base is fixed in on the guide rail of SHPB equipment base, and fragment containing box bottom is fixed on the base, and fragment containing box top is uncovered, and transparent protection casing bottom sets up and forms totally enclosed visual protective structure at fragment containing box top, and heighten the support lower extreme and fix at the base center, and the bottom of the case that heightens support upper portion upwards passed fragment containing box stretches into inside the totally enclosed visual protective structure.
2. The shielding and positioning loading device for the SHPB disc test piece as recited in claim 1, wherein: the base is of a groove plate structure with an open bottom and a through left side and a right side, U-shaped openings are respectively arranged in the middle positions of the left side edge and the right side edge of the base, connecting bolts penetrate through the two U-shaped openings to be connected with a guide rail of an SHPB equipment base, leveling screws are respectively in threaded connection with four corners of the base, two supporting plates are arranged in front of and behind the upper surface of the base at intervals, the two supporting plates are vertically arranged along the left and right directions, and the lower side edges of the two supporting plates are fixedly connected to the upper surface; the bottom of the fragment containing box is fixedly connected with the upper side edges of the two support plates.
3. The shielding and positioning loading device for the SHPB disc test piece as recited in claim 2, wherein: the height-adjusting support comprises two vertical channel steel guide rails, a lifting support plate, a cushion table, a coarse-adjusting lifting driving mechanism and a fine-adjusting lifting driving mechanism, the lower ends of the two vertical channel steel guide rails are fixedly connected to the upper surface of the base, the two vertical channel steel guide rails are arranged at intervals left and right and are oppositely arranged on the opening side, the lifting support plate is vertically inserted into grooves of the two vertical channel steel guide rails, and the cushion table is horizontally arranged on the upper side edge of the lifting support plate; a group of thick tooth grooves and a group of thin tooth grooves are vertically arranged between the two vertical channel steel guide rails on the front side face or the rear side face of the lifting support plate, locking screws are connected to the front side or the side portions of the vertical channel steel guide rails in a threaded mode, and the inner ends of the locking screws are in compression joint fit with the lifting support plate.
4. The shielding and positioning loading device for the SHPB disc test piece as recited in claim 3, wherein: the coarse adjustment lifting driving mechanism comprises a coarse driving shaft, a large gear and a coarse adjustment knob, the coarse driving shaft is horizontally arranged along the front-back direction, the front end and the rear end of the coarse driving shaft are respectively and rotatably connected to the supporting plates on the front side and the rear side, the large gear is installed on the coarse driving shaft and is meshed with the coarse tooth grooves, and the coarse adjustment knob is installed at the front end part of the coarse driving shaft.
5. The shielding and positioning loading device for the SHPB disc test piece as recited in claim 4, wherein: the fine adjustment lifting driving mechanism comprises a fine driving shaft, a pinion and a fine adjustment knob, the fine driving shaft is horizontally arranged along the front-back direction, the front end and the back end of the fine driving shaft are respectively and rotatably connected to the supporting plates on the front side and the back side, the pinion is installed on the fine driving shaft and meshed with the fine tooth grooves, and the fine adjustment knob is installed at the front end part of the fine driving shaft.
6. The shielding and positioning loading device for the SHPB disc test piece as recited in claim 5, wherein: vertical channel-section steel guide rail is last along vertical scale that is equipped with, fills up the horizontal scale that bench surface was equipped with along controlling the horizontal direction, fills up the bench and has inlayed the surveyor's level.
7. The shielding and positioning loading device for the SHPB disc test piece as recited in claim 6, wherein: the top of the transparent protective cover is of an arch structure, the lower part of the middle of the left end surface and the right end surface of the transparent protective cover is provided with an opening and closing door, and a rod penetrating hole is arranged above the opening and closing door.
8. The test method adopting the protection and positioning loading device for the SHPB disc test piece as claimed in claim 7, wherein: the method comprises the following steps:
the method comprises the following steps: firstly, clamping a base on a guide rail of an SHPB device base, screwing a leveling screw and observing a leveling instrument until a cushion table is horizontal, and then fixing the base on the SHPB device base through a U-shaped opening by using a connecting bolt;
step two: the supporting height matched with the size of the test piece is calculated in advance,
whereinh 1In order to support the height of the support,Hthe height from the center of the pressure lever to the base of the SHPB device,Ris a disc test pieceThe radius of (a) is greater than (b),h 2the thickness of the cushion table is used as the thickness of the cushion table,h 3in order to lift the height of the supporting plate,bis the base plate thickness of the base;
step three: the coarse adjustment knob is held by a hand to drive the coarse driving shaft to rotate, the large gear on the coarse driving shaft drives the meshed coarse gear groove to enable the lifting support plate to move upwards along the two vertical channel steel guide rails, a vertical graduated scale on the vertical channel steel guide rails is observed, the lifting support plate is enabled to ascend to a position close to the supporting height, then the fine adjustment knob is held by the hand to drive the fine driving shaft to rotate, the small gear on the fine driving shaft drives the meshed fine gear groove to enable the lifting support plate to move upwards or downwards along the two vertical channel steel guide rails until the upper surface of the cushion table is adjusted to the accurate supporting height, and then the locking screw is screwed down to enable the lifting support plate and the two vertical channel steel guide;
step four: placing a disc-shaped test piece on a cushion table, ensuring that the test piece is placed in the center of the cushion table according to a horizontal graduated scale on the upper surface of the cushion table, and finally pressing the left side surface and the right side surface of the test piece tightly by using an incident rod and a transmission rod of an SHPB device;
step five: opening an opening and closing door of the transparent protective cover, placing the bottom of the transparent protective cover on the fragment containing box, enabling the incident rod and the transmission rod to be right in the rod penetrating hole, fixing the transparent protective cover and the fragment containing box together through a fixing bolt, and finally closing the opening and closing door;
step six: starting an SHPB device, performing an impact test on the test piece, and observing the whole process of impact on the test piece through a transparent protective cover; the test piece falls to the fragment containing box bottom at transparent protection casing's the blockking after being broken.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113588411A (en) * | 2021-07-22 | 2021-11-02 | 江汉大学 | Adjustable positioning device for cylindrical sample of Hopkinson pressure bar |
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