CN113008696A - Asphalt pavement low-temperature cracking resistance performance test system - Google Patents
Asphalt pavement low-temperature cracking resistance performance test system Download PDFInfo
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- CN113008696A CN113008696A CN202110322446.6A CN202110322446A CN113008696A CN 113008696 A CN113008696 A CN 113008696A CN 202110322446 A CN202110322446 A CN 202110322446A CN 113008696 A CN113008696 A CN 113008696A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 48
- 238000005336 cracking Methods 0.000 title claims abstract description 27
- 238000011056 performance test Methods 0.000 title claims description 5
- 238000012360 testing method Methods 0.000 claims abstract description 60
- 230000000670 limiting effect Effects 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000003825 pressing Methods 0.000 claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 claims abstract description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 abstract description 2
- 239000000110 cooling liquid Substances 0.000 description 3
- 206010063659 Aversion Diseases 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010998 test method 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
- 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
- G01N3/18—Performing tests at high or low temperatures
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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
- 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
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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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- 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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
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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
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
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- Life Sciences & Earth Sciences (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The application relates to a low-temperature cracking resistance test system for an asphalt pavement, which comprises a base, a water tank and a support column, wherein a fixed frame is fixed at the top of the base; a mounting box is fixed on one side of the fixing frame close to the water tank, and an internal thread pipe penetrates through the mounting box; the internal thread of the internal thread pipe is connected with a threaded shaft, and the bottom end of the threaded shaft is fixedly provided with a pressing head; a driving component is arranged in the mounting box; a jacking shaft is connected in the supporting column in a sliding manner along the vertical direction; a first connecting piece is connected in the support column in a sliding manner along the width direction of the support column; a vertical connecting rod is fixed on one side of the first connecting piece, which is far away from the jacking shaft; a transverse connecting rod is fixed at the top end of the vertical connecting rod; the outer peripheral surface of the threaded shaft is provided with two strip-shaped limiting grooves, and the threaded shaft is connected with the end part of the transverse connecting rod in a sliding manner through the strip-shaped limiting grooves; the first connecting piece and the opposite inner sides of the jacking shafts are respectively provided with a third inclined surface. The method has the effect of accurately defining the measurement starting time of the low-temperature cracking resistance test.
Description
Technical Field
The application relates to the field of asphalt low-temperature resistance tests, in particular to a system for testing low-temperature cracking resistance of an asphalt pavement.
Background
At present, the deformability of asphalt pavement is reduced by the increase in rigidity at low temperatures. When the air temperature suddenly drops, the asphalt surface layer cannot shrink due to the restraint of the base layer, so that great temperature stress is generated, and when the accumulated temperature stress exceeds the tensile strength of the mixture at a certain weak point of the asphalt surface layer, the pavement can crack.
The related technology can refer to Chinese patent application with publication number CN104089829A, and discloses a test method and a test device for low-temperature cracking resistance of an asphalt beam, which comprise a test groove filled with cooling liquid, wherein a support for providing two-point support for an asphalt beam test piece is arranged in the test groove, a loading device for continuously applying constant vertical load to the asphalt beam test piece is arranged above the test groove, and a loading pressure head for abutting against the mid-span part of the asphalt beam test piece is arranged on the loading device. And evaluating the low-temperature cracking resistance of the asphalt test piece by recording the pressure applied by the loading pressure head on the asphalt test piece and the test time of the crack of the asphalt test piece.
For the related technologies, the inventor thinks that there is a defect that when a loading pressure head is about to contact with an asphalt test piece, since whether the loading pressure head is in contact with the asphalt test piece or not cannot be observed by naked eyes, a pressure value fed back by the loading pressure head at the beginning of contact with the asphalt test piece is also in a floating state, and the initial time of measurement cannot be accurately defined, so that a time value of cracking of the asphalt test piece is deviated.
Disclosure of Invention
In order to improve the problem that the measured starting time cannot be defined accurately, the application provides a low-temperature cracking resistance test system for the asphalt pavement.
The application provides a bituminous paving resistance to low temperature cracking performance test system adopts following technical scheme:
a low-temperature cracking resistance test system for an asphalt pavement comprises a base, a water tank fixed at the top of the base and two support columns fixed at the bottom of the water tank, wherein a fixed frame is fixed at the top of the base; a mounting box is fixed on one side of the fixing frame close to the water tank, and an internal thread pipe penetrates through the mounting box; the internal thread of the internal thread pipe is connected with a threaded shaft, and a pressing head is fixed at the bottom end of the threaded shaft; a driving assembly for driving the internal threaded pipe to rotate is arranged in the mounting box; a jacking shaft is connected in the supporting column in a vertical sliding manner; a first connecting piece is connected in the supporting column in a sliding manner along the width direction of the supporting column; a vertical connecting rod is fixed on one side of the first connecting piece, which is far away from the jacking shaft; a transverse connecting rod is fixed at the top end of the vertical connecting rod; the outer peripheral surface of the threaded shaft is provided with two strip-shaped limiting grooves, and the threaded shaft is connected with the end part of the transverse connecting rod in a sliding manner through the strip-shaped limiting grooves; and third inclined planes are respectively arranged on the opposite inner sides of the first connecting piece and the jacking shaft.
Through adopting above-mentioned technical scheme, transverse connection pole provides limiting displacement for the screw spindle through the bar spacing groove for the screw spindle only can follow vertical removal with internal thread pipe thread fit in-process. After the asphalt test piece placed at the top of the jacking shaft is pressed to move downwards, the first connecting piece is pressed to move by the jacking shaft, and the first connecting piece can drive the transverse connecting rod to move through the vertical connecting rod and separate the transverse connecting rod from the threaded shaft. The threaded shaft stops moving downwards after losing the limiting effect, so that the position where the threaded shaft stops moving downwards can be used as the starting point of the test, and the starting time of the test is conveniently defined.
Optionally, the top of the support column is provided with a chute; the supporting column is connected with the top supporting shaft in a sliding manner through a sliding chute; a first mounting groove is formed in one side of the sliding groove, and the supporting column is connected with the first connecting piece in a sliding mode through the first mounting groove; the top of the first mounting groove is provided with a second mounting groove, and the support column is connected with the vertical connecting rod in a sliding manner along the width direction of the support column through the second mounting groove; be provided with the fixed subassembly that is used for fixed support column and be used for spacing subassembly for pitch test piece in the support column.
Through adopting above-mentioned technical scheme, the spout provides the guide effect along vertical movement for the support column, and first mounting groove provides the guide effect along support column width direction removal for first connecting piece.
Optionally, a first guide member is fixed at the bottom of the first connecting member, a first guide groove is formed in the bottom surface of the first mounting groove, and the first guide member is connected with the support column in a sliding manner through the first guide groove; and a third spring is fixed on one side of the first guide piece, which is far away from the top support shaft, and the third spring is fixedly connected with the support column through a first guide groove.
Through adopting above-mentioned technical scheme, the third spring provides the elasticity to being close to shore axle one side for first guide, is convenient for reset to being close to shore axle one side through the first connecting piece of third spring drive.
Optionally, the driving assembly comprises an air cylinder fixed at the top of the mounting box and a motor fixed in the mounting box, and the internal threaded pipe is rotatably connected with a piston rod of the air cylinder; a driving gear is fixed at the output end of the motor; a driven gear is rotatably arranged on the inner bottom surface of the mounting box; the driven gear is connected with the internal thread pipe in a sliding mode along the vertical direction.
Through adopting above-mentioned technical scheme, the motor passes through the driving gear and drives driven gear and rotate to drive the rotation of internal thread pipe through driven gear. After the initial time of the test is determined, the cylinder is started, and the cylinder can drive the internal thread pipe and the thread shaft to downwards abut against the asphalt test piece.
Optionally, a circular through hole for penetrating through the internal thread pipe is formed in the top surface of the driven gear, two third guide pieces are fixed on the inner circumferential surface of the circular through hole, two third guide grooves are formed in the outer circumferential surface of the internal thread pipe, and the third guide pieces are connected with the internal thread pipe in a sliding manner through the third guide grooves.
Through adopting above-mentioned technical scheme, the third guide passes through the third guide way and provides along vertical guide effect for the internal thread pipe, and the internal thread pipe of being convenient for rotates the in-process along vertical removal along with driven gear.
Optionally, the fixing assembly includes a first slider connected to the support column in a sliding manner along the width direction of the support column, a second slider connected to the support column in a sliding manner along the vertical direction, and a third slider for being inserted into the side wall of the support column; the side wall of the sliding groove is provided with a first connecting groove and a third connecting groove; the sliding groove is connected with the first sliding block in a sliding mode through a first connecting groove, and the supporting column is connected with the third sliding block in a sliding mode through a third connecting groove in the width direction of the supporting column; a second connecting groove is formed in the top of the first connecting groove, a square through hole for penetrating a third sliding block is formed in one side, close to the jacking shaft, of the second sliding block, and a limiting part for being in plug-in connection with the top of the third sliding block is fixed on the inner top surface of the square through hole; first inclined planes are respectively arranged on the opposite inner sides of the first sliding block and the jacking shaft, and second inclined planes are respectively arranged on the opposite inner sides of the first sliding block and the second sliding block.
Through adopting above-mentioned technical scheme, peg graft through third slider and shoring axle, provide the fixed action for shoring axle. After the jacking shaft is abutted against the first sliding block, the first sliding block pushes the second sliding block to move upwards, so that the limitation of the second sliding block on the third sliding block is removed. The second sliding block is used for limiting the third sliding block, so that the possibility that the top support is blocked by the third sliding block in the axial downward moving process is reduced.
Optionally, one side, away from the top support shaft, of the third sliding block is fixed with a return spring, and one end, away from the third sliding block, of the return spring is fixedly connected with the support column through a third connecting groove.
Through adopting above-mentioned technical scheme, reset spring applys for the third slider to being close to the elasticity of shoring axle one side, is convenient for peg graft with the shoring axle through reset spring drive third slider to for the shoring axle provides fixedly.
Optionally, the limiting assembly comprises a third connecting piece fixedly connected with the supporting column and a fourth connecting piece connected with the supporting column in a sliding manner along the width direction of the supporting column; the second connecting piece and the third connecting piece are arranged in the second mounting groove in a sliding manner; the top of the second connecting piece is provided with a matching groove, and the bottom of the third connecting piece and one side of the matching groove close to the jacking shaft are both provided with a fourth inclined plane; a third mounting groove is formed in one side, close to the supporting shaft, of the second mounting groove, and the supporting column is connected with a third connecting piece in a sliding mode through the third mounting groove; the opposite inner sides of the third connecting piece and the fourth connecting piece are respectively provided with a fifth inclined plane; and a limiting rod is fixed at the top of the fourth connecting piece.
Through adopting above-mentioned technical scheme, the second connecting piece supports through the fourth inclined plane of cooperation inslot and presses the third connecting piece to promote third connecting piece rebound, the third connecting piece promotes the fourth connecting piece through the fifth inclined plane and moves to being close to shore axle one side, and the fourth connecting piece drives the gag lever post and removes, provides the support for the pitch test piece after the gag lever post removes, reduces the pitch test piece and the possibility that the aversion condition appears in the experimentation.
Optionally, a dovetail block is fixed to one side, close to the jacking shaft, of the third connecting piece, a dovetail groove is formed in one side, far away from the jacking shaft, of the second mounting groove, and the dovetail block is connected with the supporting column in a sliding mode through the dovetail groove.
Through adopting above-mentioned technical scheme, the dovetail provides along vertical guide effect for the forked tail piece, and the dovetail can provide the support for the third connecting piece simultaneously, and the third connecting piece of being convenient for can not separate with the support column along vertical migration.
Optionally, a fourth spring is fixed at the top of the dovetail block, and the top end of the fourth spring is fixedly connected with the support column through a dovetail groove.
Through adopting above-mentioned technical scheme, the fourth spring provides decurrent elasticity for the forked tail piece, is convenient for drive third connecting piece and resets downwards.
In summary, the present application includes at least one of the following beneficial technical effects:
1. after the asphalt test piece placed at the top of the jacking shaft is pressed to move downwards, the first connecting piece is pressed to move by the jacking shaft, and the first connecting piece can drive the transverse connecting rod to move through the vertical connecting rod and separate the transverse connecting rod from the threaded shaft. The threaded shaft stops moving downwards after losing the limiting function, so that the position of the threaded shaft stopping moving downwards can be used as the starting point of the test, and the starting time of the test is conveniently defined;
2. the third sliding block is inserted into the top support shaft to provide a fixing effect for the top support shaft. After the jacking shaft is abutted against the first sliding block, the first sliding block pushes the second sliding block to move upwards, so that the limitation of the second sliding block on the third sliding block is removed. The second sliding block is used for limiting the third sliding block, so that the possibility that the top support is blocked by the third sliding block in the axial downward moving process is reduced;
3. the second connecting piece supports and presses the third connecting piece through the fourth inclined plane of cooperation inslot to promote third connecting piece rebound, the third connecting piece promotes the fourth connecting piece through the fifth inclined plane and moves to being close to shore axle one side, and the fourth connecting piece drives the gag lever post and removes, provides the support for the pitch test piece after the gag lever post removes, reduces the pitch test piece and the possibility that the aversion condition appears in the experimentation.
Drawings
FIG. 1 is a cross-sectional view of a low temperature cracking resistance test system according to an embodiment of the present application.
FIG. 2 is a schematic structural diagram of a low temperature cracking resistance test system according to an embodiment of the present application.
Fig. 3 is a sectional view taken along line a-a of fig. 2.
Fig. 4 is an enlarged schematic view at B in fig. 3.
Fig. 5 is an enlarged schematic view at C in fig. 3.
Fig. 6 is an enlarged schematic view at D in fig. 3.
Description of reference numerals: 1. a base; 11. a water tank; 12. a cross bar; 13. a fixed mount; 14. a vertical rod; 15. a third spring; 16. a third inclined plane; 2. mounting a box; 21. a cylinder; 22. an internally threaded tube; 23. a driving gear; 24. a motor; 25. a circular through hole; 26. a third guide member; 27. a third guide groove; 28. a threaded shaft; 29. a pressing head; 3. a support pillar; 31. a chute; 32. a jacking shaft; 33. asphalt test pieces; 34. a square through hole; 35. a limiting member; 36. a first inclined plane; 37. a second inclined plane; 4. a fixing assembly; 41. a first slider; 42. a second slider; 43. a third slider; 44. a first connecting groove; 45. a third connecting groove; 46. a first spring; 47. a second connecting groove; 48. a return spring; 5. a start-stop assembly; 51. a first connecting member; 52. a vertical connecting rod; 53. a transverse connecting rod; 54. a strip-shaped limiting groove; 55. a first mounting groove; 56. a second mounting groove; 57. a first guide member; 58. a first guide groove; 6. a limiting component; 61. a second connecting member; 62. a third connecting member; 63. a fourth connecting member; 64. a fourth spring; 65. a mating groove; 66. a fourth slope; 67. a dovetail block; 68. a dovetail groove; 7. a limiting rod; 71. a third mounting groove; 72. a second guide piece; 73. a second guide groove; 74. a fifth bevel; 75. a fifth spring; 76. a driven gear.
Detailed Description
The present application is described in further detail below with reference to figures 1-6.
The embodiment of the application discloses bituminous paving resistance to low temperature cracking performance test system. Referring to fig. 1 and 2, the asphalt pavement low temperature cracking resistance test system comprises a base 1, a water tank 11 fixed on the top of the base 1, and two support columns 3 fixed on the bottom of the water tank 11; the water tank 11 is used for containing water cooling liquid, and the asphalt plate to be tested is placed in the water cooling liquid to simulate the temperature of a low-temperature environment. A fixed frame 13 is fixed on the top of the base 1; the fixing frame 13 comprises a vertical rod 14 fixed on the top of the base 1 and a cross rod 12 fixed on one side of the vertical rod 14 close to the water tank 11. A mounting box 2 is fixed on one side of the cross bar 12 close to the water tank 11, an air cylinder 21 is fixed on the top of the mounting box 2, and a piston rod of the air cylinder 21 is rotatably connected with an internal threaded pipe 22; an internally threaded tube 22 is provided through the mounting box 2. A motor 24 is fixed in the mounting box 2, and a driving gear 23 is fixed at the output end of the motor 24. A driven gear 76 is rotatably mounted on the inner bottom surface of the mounting case 2. The cylinder 21 is used for pushing the internal threaded pipe 22 to move downwards; the motor 24 is used for driving the internally threaded tube 22 to rotate. The top surface of the driven gear 76 is provided with a circular through hole 25 for penetrating the internal threaded pipe 22, two third guide pieces 26 are fixed on the inner circumferential surface of the circular through hole 25, two third guide grooves 27 are formed on the outer circumferential surface of the internal threaded pipe 22, and the third guide pieces 26 are connected with the internal threaded pipe 22 in a sliding manner through the third guide grooves 27; the third guide groove 27 provides a guide function for the third guide member 26, so that the driven gear 76 rotates the internally threaded tube 22. The threaded tube 22 is connected with a threaded shaft 28 in a threaded manner, and a pressing head 29 is fixed at the bottom end of the threaded shaft 28. Through the threaded connection of the threaded shaft 28 and the internally threaded tube 22, when the threaded shaft 28 is subjected to a limit action in the vertical direction, the threaded shaft 28 drives the pressing head 29 to move downwards.
Referring to fig. 3, the top of the supporting column 3 is provided with a sliding groove 31. The supporting column 3 is connected with a supporting shaft 32 through a sliding chute 31 in a sliding manner along the vertical direction; the jacking shaft 32 is used to provide support for the asphalt test piece 33. A fixing component 4 for fixing the supporting column 3, a start-stop component 5 for driving the threaded shaft 28 to stop moving downwards and a limiting component 6 for limiting the asphalt test piece 33 are arranged in the supporting column 3.
Referring to fig. 4 and 5, the fixing assembly 4 includes a first sliding block 41 connected to the support column 3 in a sliding manner along the width direction of the support column 3, a second sliding block 42 connected to the support column 3 in a sliding manner along the vertical direction, and a third sliding block 43 for plugging into the side wall of the support column 3; the third slider 43 provides a fixing action for the jack shaft 32, thereby fixing the jack shaft 32 in the support column 3. The side wall of the sliding chute 31 is provided with a first connecting groove 44 and a third connecting groove 45; the sliding groove 31 is connected with the first sliding block 41 through a first connecting groove 44 in a sliding manner, and the supporting column 3 is connected with the third sliding block 43 through a third connecting groove 45 in a sliding manner along the width direction of the supporting column 3. A return spring 48 is fixed on one side of the third sliding block 43 far away from the supporting shaft 32, and one end of the return spring 48 far away from the third sliding block 43 is fixedly connected with the supporting column 3 through a third connecting groove 45; the return spring 48 provides the third slider 43 with an elastic force toward the side close to the jack shaft 32, so as to drive the third slider 43 to return toward the side close to the jack shaft 32. A second connecting groove 47 communicated with the third connecting groove 45 is formed in the top of the first connecting groove 44, a first spring 46 is fixed to the top of the second sliding block 42, and the top end of the first spring 46 is fixedly connected with the supporting column 3 through the second connecting groove 47; the first spring 46 provides a downward elastic force to the second slider 42, so as to drive the second slider 42 to return downward. A square through hole 34 for penetrating the third slider 43 is formed in one side of the second slider 42 close to the supporting shaft 32, and a square limiting member 35 for being inserted into the top of the third slider 43 is fixed on the inner top surface of the square through hole 34. The limiting member 35 is used for providing a limiting effect for the third sliding block 43, so that the supporting shaft 32 is not blocked by the third sliding block 43 when moving downwards.
Referring to fig. 3 and 4, the first slider 41 and the inner side of the top support shaft 32 opposite to each other are respectively provided with a first inclined surface 36, and the first inclined surface 36 is located at the bottom end of the top support shaft 32. The opposite inner sides of the first slider 41 and the second slider 42 are respectively provided with a second inclined surface 37. The jacking shaft 32 is abutted against the first sliding block 41 through the first inclined surface 36 and pushes the first sliding block 41 to move towards the side far away from the jacking shaft 32, the first sliding block 41 is abutted against the second sliding block 42 through the second inclined surface 37 and pushes the second sliding block 42 to move upwards, and in the moving process of the second sliding block 42, the limiting part 35 is separated from the third sliding block 43, so that the reset spring 48 can drive the third sliding block 43 to be inserted into the jacking shaft 32, and the jacking shaft 32 is fixed.
Referring to fig. 3 and 4, the start-stop assembly 5 includes a square first connecting member 51 slidably connected with the support column 3 in the width direction of the support column 3, and a vertical connecting rod 52 fixed to a side of the first connecting member 51 away from the top support shaft 32. A transverse connecting rod 53 is fixed at the top end of the vertical connecting rod 52 and close to one side of the first connecting piece 51. Two strip-shaped limiting grooves 54 are formed in the peripheral surface of the threaded shaft 28, and the threaded shaft 28 is connected with the end portion of the transverse connecting rod 53 in a sliding mode in the vertical direction through the strip-shaped limiting grooves 54. The chute 31 is provided with a first mounting groove 55 on a side away from the first connecting groove 44, and the support column 3 is connected with the first connecting member 51 in a sliding manner through the first mounting groove 55. The first connecting member 51 and the inner side of the top support shaft 32 are respectively provided with a third inclined surface 16. Second mounting groove 56 has been seted up at first mounting groove 55 top, and support column 3 slides along support column 3 width direction through second mounting groove 56 and is connected with vertical connecting rod 52. The jacking shaft 32 moves downwards and contacts with the first connecting piece 51, the jacking shaft 32 presses against the first connecting piece 51 through the third inclined plane 16, the first connecting piece 51 is pushed to move towards the side far away from the first sliding block 41, and the first connecting piece 51 drives the transverse connecting rod 53 to move through the vertical connecting rod 52. First connecting piece 51 bottom is fixed with first guide 57, and first mounting groove 55 bottom surface is seted up first guide way 58, and first guide 57 slides through first guide way 58 and is connected with support column 3. The first guide 57 is fixed with the third spring 15 on the side away from the top support shaft 32, and the third spring 15 is fixedly connected with the support column 3 through the first guide groove 58.
Referring to fig. 3 and 6, the position limiting assembly 6 includes a second connecting member 61 fixed on one side of the vertical connecting rod 52 close to the horizontal connecting rod 53, a third connecting member 62 connected with the support column 3 in a sliding manner along the vertical direction, and a fourth connecting member 63 connected with the support column 3 in a sliding manner along the width direction of the support column 3. The second connecting piece 61 and the third connecting piece 62 are slidably arranged in the second mounting groove 56. The top of the second connecting member 61 is provided with a matching groove 65, and the bottom of the third connecting member 62 and one side of the matching groove 65 close to the supporting shaft 32 are both provided with a fourth inclined surface 66. A dovetail block 67 is fixed on one side of the third connecting piece 62 close to the top support shaft 32, a dovetail groove 68 is formed in one side of the second mounting groove 56 far away from the top support shaft 32, and the dovetail block 67 is connected with the support column 3 in a sliding mode in the vertical direction through the dovetail groove 68; by sliding engagement of dovetail block 67 with dovetail slot 68, support is provided for third connector 62, reducing the likelihood of third connector 62 falling downward. The top of the dovetail block 67 is fixed with a fourth spring 64, and the top end of the fourth spring 64 is fixedly connected with the support column 3 through a dovetail groove 68. The second mounting groove 56 is provided with a third mounting groove 71 on one side close to the supporting shaft 32, and the supporting column 3 is connected with the third connecting piece 62 in a sliding manner through the third mounting groove 71. The top of the third connecting piece 62 is fixed with a second guide piece 72, the top surface of the third mounting groove 71 is provided with a second guide groove 73, and the second guide piece 72 is connected with the second guide groove 73 in a sliding manner along the width direction of the support column 3. A fifth spring 75 is fixed on one side of the second guide plate 72 close to the supporting shaft 32, and the fifth spring 75 is fixedly connected with the supporting column 3 through a second guide groove 73. The opposite inner sides of the third connecting member 62 and the fourth connecting member 63 are respectively provided with a fifth inclined surface 74. The top of the fourth connecting piece 63 is fixed with a limiting rod 7. The longitudinal section of the limiting rod 7 is L-shaped.
The implementation principle of the low-temperature cracking resistance test system for the asphalt pavement in the embodiment of the application is as follows:
the water is added into the water tank 11 to create a low-temperature environment, and the asphalt test piece 33 is placed into the water tank 11 to be soaked for 10-20 min. The asphalt test piece 33 is placed on top of the jack shaft 32. The motor 24 is started, the motor 24 drives the driven gear 76 to rotate through the driving gear 23, and the driven gear 76 drives the internal threaded pipe 22 to rotate. At this time, the transverse connecting rod 53 and the strip-shaped limiting groove 54 of the threaded shaft 28 are in an inserted state, and the threaded shaft 28 drives the pressing head 29 to move downwards in the process of threaded connection of the internal threaded pipe 22 and the threaded shaft 28.
The pressing head 29 is pressed against the asphalt test piece 33 downwards after contacting the asphalt test piece 33, the jacking shaft 32 is pressed against the first sliding block 41 through the first inclined surface 36 in the downward moving process, the first sliding block 41 is pushed to move towards the side far away from the jacking shaft 32, the first sliding block 41 is pressed against the second sliding block 42 through the second inclined surface 37, the second sliding block 42 is pushed to move upwards, the limiting part 35 is separated from the third sliding block 43 in the moving process of the second sliding block 42, the reset spring 48 is convenient to drive the third sliding block 43 to be inserted into the jacking shaft 32, and therefore the jacking shaft 32 is fixed.
The jacking shaft 32 contacts with the first connecting piece 51 in the downward moving process, the jacking shaft 32 presses against the first connecting piece 51 through the third inclined plane 16, the first connecting piece 51 is pushed to move towards the side far away from the first sliding block 41, and the first connecting piece 51 drives the transverse connecting rod 53 to move through the vertical connecting rod 52. The transverse connecting rod 53 is separated from the strip-shaped limiting groove 54 in the moving process. The threaded shaft 28 loses its stop and no longer moves downward.
Meanwhile, the second connecting piece 61 presses the third connecting piece 62 to move upwards through the fourth inclined surface 66 opened in the matching groove 65, the third connecting piece 62 presses the fourth connecting piece 63 through the fifth inclined surface 74, and the fourth connecting piece 63 is pushed to move towards the side close to the top support shaft 32. The limiting rod 7 abuts against the asphalt test piece 33 in the moving process along with the fourth connecting piece 63, and is not limited by the asphalt test piece 33, so that the possibility of displacement of the asphalt test piece 33 in the measuring process is reduced.
After the cylinder 21 is started, the cylinder 21 pushes the internal threaded pipe 22 to move downwards, and the internal threaded pipe 22 drives the pressing head 29 to downwards abut against the asphalt test piece 33 through the threaded shaft 28 to perform a low-temperature cracking resistance test.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The utility model provides an anti low temperature cracking performance test system of bituminous paving, includes base (1), is fixed in basin (11) at base (1) top and be fixed in two support columns (3) of basin (11) bottom, its characterized in that: a fixed frame (13) is fixed at the top of the base (1); a mounting box (2) is fixed on one side of the fixing frame (13) close to the water tank (11), and an internal threaded pipe (22) penetrates through the mounting box (2); a threaded shaft (28) is connected with the internal thread of the internal threaded pipe (22), and a pressing head (29) is fixed at the bottom end of the threaded shaft (28); a driving assembly for driving the internal threaded pipe (22) to rotate is arranged in the mounting box (2); a jacking shaft (32) is connected in the supporting column (3) in a sliding manner along the vertical direction; a first connecting piece (51) is connected in the supporting column (3) in a sliding manner along the width direction of the supporting column (3); a vertical connecting rod (52) is fixed on one side of the first connecting piece (51) far away from the top supporting shaft (32); a transverse connecting rod (53) is fixed at the top end of the vertical connecting rod (52); the outer peripheral surface of the threaded shaft (28) is provided with two strip-shaped limiting grooves (54), and the threaded shaft (28) is connected with the end part of the transverse connecting rod (53) in a sliding manner through the strip-shaped limiting grooves (54); and third inclined planes (16) are respectively arranged on the opposite inner sides of the first connecting piece (51) and the jacking shaft (32).
2. The system for testing the low-temperature cracking resistance of the asphalt pavement according to claim 1, wherein: the top of the supporting column (3) is provided with a sliding chute (31); the supporting column (3) is connected with a supporting shaft (32) in a sliding manner through a sliding chute (31); a first mounting groove (55) is formed in one side of the sliding groove (31), and the supporting column (3) is connected with a first connecting piece (51) in a sliding mode through the first mounting groove (55); the top of the first mounting groove (55) is provided with a second mounting groove (56), and the supporting column (3) is connected with the vertical connecting rod (52) in a sliding manner along the width direction of the supporting column (3) through the second mounting groove (56); and a fixing component (4) for fixing the supporting column (3) and a limiting component (6) for limiting the asphalt test piece (33) are arranged in the supporting column (3).
3. The system for testing the low-temperature cracking resistance of the asphalt pavement according to claim 2, wherein: a first guide piece (57) is fixed at the bottom of the first connecting piece (51), a first guide groove (58) is formed in the bottom surface of the first mounting groove (55), and the first guide piece (57) is connected with the supporting column (3) in a sliding mode through the first guide groove (58); and a third spring (15) is fixed on one side, away from the top supporting shaft (32), of the first guide piece (57), and the third spring (15) is fixedly connected with the supporting column (3) through a first guide groove (58).
4. The system for testing the low-temperature cracking resistance of the asphalt pavement according to claim 2, wherein: the driving assembly comprises an air cylinder (21) fixed at the top of the mounting box (2) and a motor (24) fixed in the mounting box (2), and the internal threaded pipe (22) is rotatably connected with a piston rod of the air cylinder (21); a driving gear (23) is fixed at the output end of the motor (24); a driven gear (76) is rotatably arranged on the inner bottom surface of the mounting box (2); the driven gear (76) is connected with the internal threaded pipe (22) in a sliding mode along the vertical direction.
5. The system for testing the low-temperature cracking resistance of the asphalt pavement according to claim 4, wherein: the top surface of the driven gear (76) is provided with a circular through hole (25) used for penetrating through the internal threaded pipe (22), the inner peripheral surface of the circular through hole (25) is fixedly provided with two third guide pieces (26), the outer peripheral surface of the internal threaded pipe (22) is provided with two third guide grooves (27), and the third guide pieces (26) are connected with the internal threaded pipe (22) in a sliding mode through the third guide grooves (27).
6. The system for testing the low-temperature cracking resistance of the asphalt pavement according to claim 2, wherein: the fixed assembly (4) comprises a first sliding block (41) connected with the supporting column (3) in a sliding manner along the width direction of the supporting column (3), a second sliding block (42) connected with the supporting column (3) in a sliding manner along the vertical direction, and a third sliding block (43) inserted into the side wall of the supporting column (3); a first connecting groove (44) and a third connecting groove (45) are formed in the side wall of the sliding groove (31); the sliding groove (31) is connected with the first sliding block (41) in a sliding mode through a first connecting groove (44), and the supporting column (3) is connected with the third sliding block (43) in a sliding mode along the width direction of the supporting column (3) through a third connecting groove (45); a second connecting groove (47) is formed in the top of the first connecting groove (44), a square through hole (34) for penetrating the third sliding block (43) is formed in one side, close to the supporting shaft (32), of the second sliding block (42), and a limiting piece (35) for being connected with the top of the third sliding block (43) in an inserting mode is fixed on the inner top surface of the square through hole (34); the first slide block (41) and the opposite inner sides of the jacking shaft (32) are respectively provided with a first inclined surface (36), and the opposite inner sides of the first slide block (41) and the second slide block (42) are respectively provided with a second inclined surface (37).
7. The system for testing the low-temperature cracking resistance of the asphalt pavement according to claim 6, wherein: and one side of the third sliding block (43) far away from the top supporting shaft (32) is fixed with a return spring (48), and one end of the return spring (48) far away from the third sliding block (43) is fixedly connected with the supporting column (3) through a third connecting groove (45).
8. The system for testing the low-temperature cracking resistance of the asphalt pavement according to claim 6, wherein: the limiting assembly (6) comprises a second connecting piece (61) fixed on one side of the vertical connecting rod (52) close to the transverse connecting rod (53), a third connecting piece (62) connected with the support column (3) in a sliding mode along the vertical direction, and a fourth connecting piece (63) connected with the support column (3) in a sliding mode along the width direction of the support column (3); the second connecting piece (61) and the third connecting piece (62) are arranged in the second mounting groove (56) in a sliding manner; the top of the second connecting piece (61) is provided with a matching groove (65), and the bottom of the third connecting piece (62) and one side, close to the jacking shaft (32), of the matching groove (65) are provided with fourth inclined planes (66); a third mounting groove (71) is formed in one side, close to the jacking shaft (32), of the second mounting groove (56), and the supporting column (3) is connected with a third connecting piece (62) in a sliding mode through the third mounting groove (71); the opposite inner sides of the third connecting piece (62) and the fourth connecting piece (63) are respectively provided with a fifth inclined plane (74); a limiting rod (7) is fixed to the top of the fourth connecting piece (63).
9. The system for testing the low-temperature cracking resistance of the asphalt pavement according to claim 6, wherein: third connecting piece (62) are fixed with dovetail block (67) near top strut axle (32) one side, dovetail (68) have been seted up to second mounting groove (56) keep away from top strut axle (32) one side, dovetail block (67) are passed through dovetail (68) and are connected with support column (3) slide.
10. The system for testing the low-temperature cracking resistance of the asphalt pavement according to claim 9, wherein: a fourth spring (64) is fixed to the top of the dovetail block (67), and the top end of the fourth spring (64) is fixedly connected with the supporting column (3) through a dovetail groove (68).
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