CN113008696B - Asphalt pavement low-temperature cracking resistance test system - Google Patents
Asphalt pavement low-temperature cracking resistance test system Download PDFInfo
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- CN113008696B CN113008696B CN202110322446.6A CN202110322446A CN113008696B CN 113008696 B CN113008696 B CN 113008696B CN 202110322446 A CN202110322446 A CN 202110322446A CN 113008696 B CN113008696 B CN 113008696B
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- 238000012360 testing method Methods 0.000 title claims abstract description 65
- 239000010426 asphalt Substances 0.000 title claims abstract description 53
- 238000005336 cracking Methods 0.000 title claims abstract description 25
- 230000000670 limiting effect Effects 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000003825 pressing Methods 0.000 claims abstract description 12
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 230000000149 penetrating effect Effects 0.000 claims abstract description 7
- 238000009434 installation Methods 0.000 claims description 4
- 238000011056 performance test Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 10
- 238000005259 measurement Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 14
- 239000000110 cooling liquid Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 2
- 238000010998 test method Methods 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
- 239000000203 mixture 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
- G01N3/08—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
-
- 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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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- 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 fixing 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 is arranged in the mounting box in a penetrating manner; the inner thread of the inner thread pipe is connected with a thread shaft, and the bottom end of the thread shaft is fixed with a pressing head; a driving component is arranged in the mounting box; a top support shaft is connected in the support column in a sliding manner along the vertical direction; the support column is internally connected with a first connecting piece in a sliding manner along the width direction of the support column; one side of the first connecting piece, which is far away from the top support shaft, is fixedly provided with a vertical connecting rod; 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 in sliding connection with the end part of the transverse connecting rod through the strip-shaped limiting grooves; the opposite inner sides of the first connecting piece and the top support shaft are respectively provided with a third inclined plane. The application 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 performance tests, in particular to a system for testing the low-temperature cracking resistance performance of an asphalt pavement.
Background
Currently, asphalt pavement deformability at low temperature is reduced due to the increased rigidity. When the air temperature suddenly drops, the asphalt surface layer cannot shrink under the constraint of the base layer, 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 be cracked.
The related art can refer to the Chinese patent application with publication number of CN104089829A, and discloses a test method and a test device for the low-temperature cracking resistance of an asphalt beam, wherein the test method and the test device comprise a test tank filled with cooling liquid, a bracket for providing two-point support for an asphalt beam test piece is arranged in the test tank, a loading device for continuously applying constant vertical load to the asphalt beam test piece is arranged above the test tank, and a loading pressure head for propping against a midspan 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 to the asphalt test piece and the test time of the crack of the asphalt test piece.
In view of the above-mentioned related art, the inventor considers that when the loading pressure head is about to contact with the asphalt test piece, because the naked eye cannot observe whether the loading pressure head is in contact with the asphalt test piece, the 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 measured starting time cannot be accurately defined, so that the defect that the time value when the asphalt test piece cracks is deviated is caused.
Disclosure of Invention
In order to solve the problem that the measured starting time cannot be accurately defined, the application provides a low-temperature cracking resistance test system for an asphalt pavement.
The application provides a low-temperature cracking resistance test system for an asphalt pavement, which adopts the following technical scheme:
the system 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 fixing frame is fixed at the top of the base; an installation box is fixed on one side of the fixing frame close to the water tank, and an internal thread pipe is arranged in the installation box in a penetrating manner; the inner thread of the inner thread pipe is connected with a thread shaft, and the bottom end of the thread shaft is fixed with a pressing head; a driving component for driving the internal threaded pipe to rotate is arranged in the mounting box; a top support shaft is connected in the support column in a sliding manner along the vertical direction; a first connecting piece is slidingly connected in the support column along the width direction of the support column; a vertical connecting rod is fixed on one side, far away from the top support shaft, of the first connecting piece; 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 in sliding connection with the end part of the transverse connecting rod through the strip-shaped limiting grooves; and the opposite inner sides of the first connecting piece and the top support shaft are respectively provided with a third inclined plane.
Through adopting above-mentioned technical scheme, the transverse connection pole provides spacing effect for the screw thread axle through bar spacing groove for the screw thread axle only can follow vertical removal in the screw thread cooperation process with the internal thread pipe. After the asphalt test piece placed at the top of the jacking shaft is moved downwards under the pressing action, the first connecting piece is moved under the pressing action of the jacking shaft, and the first connecting piece drives the transverse connecting rod to move through the vertical connecting rod, so that the transverse connecting rod is separated from the threaded shaft. The screw shaft stops moving downwards after losing the limiting effect, so that the position of the screw shaft, at which the screw shaft stops moving downwards, can be used as a starting point of a test, and the starting time of the test can be conveniently defined.
Optionally, a chute is formed at the top of the support column; the support column is connected with the top support shaft in a sliding way through a sliding groove; a first mounting groove is formed in one side of the sliding groove, and the support column is connected with the first connecting piece in a sliding manner 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; the fixing component used for fixing the support column and the limiting component used for limiting the asphalt test piece are arranged in the support column.
Through adopting above-mentioned technical scheme, the spout provides the guide effect along vertical removal 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 piece is fixed at the bottom of the first connecting piece, a first guide groove is formed in the bottom of the first mounting groove, and the first guide piece is slidably connected with the support column through the first guide groove; and a third spring is fixed on one side, far away from the top support shaft, of the first guide piece, 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 top support axle one side for first guide, is convenient for drive first connecting piece to be close to top support axle one side through the third spring and resets.
Optionally, the driving assembly comprises a cylinder fixed at the top of the mounting box and a motor fixed in the mounting box, and the internal thread tube is rotationally connected with a piston rod of the cylinder; a driving gear is fixed at the output end of the motor; the inner bottom surface of the mounting box is rotatably provided with a driven gear; the driven gear is connected with the internal thread pipe in a sliding manner along the vertical direction.
Through adopting above-mentioned technical scheme, the motor passes through the driving gear and drives driven gear rotation to drive the internal thread pipe through driven gear and rotate. After the initial time of the test is determined, the air cylinder is started, and the air cylinder drives the internal threaded pipe and the threaded shaft to downwards press the asphalt test piece.
Optionally, the driven gear top surface has seted up the circular through-hole that is used for wearing to establish the internal thread pipe, circular through-hole inner peripheral surface is fixed with two third guide, two third guide grooves have been seted up to the internal thread pipe outer peripheral surface, the third guide is connected with the internal thread pipe slip through the third guide groove.
Through adopting above-mentioned technical scheme, the third guide provides along vertical guide effect for the internal thread pipe through the third guide way, and the internal thread pipe follow-up gear rotation in-process of being convenient for is along vertical removal.
Optionally, the fixing component comprises a first sliding block slidingly connected with the support column along the width direction of the support column, a second sliding block slidingly connected with the support column along the vertical direction, and a third sliding block for being spliced with the side wall of the support column; the side wall of the chute 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 manner through the first connecting groove, and the supporting column is connected with the third sliding block in a sliding manner along the width direction of the supporting column through the third connecting groove; the top of the first connecting groove is provided with a second connecting groove, one side, close to the jacking shaft, of the second sliding block is provided with a square through hole for penetrating the third sliding block, and the inner top surface of the square through hole is fixedly provided with a limiting piece for being spliced with the top of the third sliding block; the first inclined planes are respectively formed on the inner sides of the first sliding block and the opposite inner sides of the top supporting shaft, and the second inclined planes are respectively formed on the inner sides of the first sliding block and the opposite inner sides of the second sliding block.
By adopting the technical scheme, the third sliding block is inserted into the jacking shaft to provide a fixing effect for the jacking shaft. After the jacking shaft abuts against the first sliding block, the first sliding block pushes the second sliding block to move upwards, and therefore limiting of the second sliding block on the third sliding block is relieved. The second sliding block is used for limiting the third sliding block, so that the possibility that the third sliding block is blocked in the downward movement process of the jacking shaft is reduced.
Optionally, a return spring is fixed on one side of the third slider away from the top support shaft, and one end of the return spring away from the third slider is fixedly connected with the support column through a third connecting groove.
Through adopting above-mentioned technical scheme, reset spring applys to the elasticity to being close to top support axle one side for the third slider, is convenient for peg graft with top support axle through reset spring drive third slider to provide fixedly for top support axle.
Optionally, the limiting component comprises a third connecting piece fixedly connected with the limiting component and a fourth connecting piece slidingly connected with the supporting column along the width direction of the supporting column; the second connecting piece and the third connecting piece are both arranged in the second mounting groove in a sliding way; the top of the second connecting piece is provided with a matching groove, and the bottom of the third connecting piece and one side, close to the top support shaft, of the matching groove are provided with a fourth inclined plane; a third mounting groove is formed in one side, close to the top support shaft, of the second mounting groove, and the support column is connected with a third connecting piece in a sliding manner 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 the third connecting piece through the fourth inclined plane in the cooperation groove to promote the third connecting piece upward movement, the third connecting piece promotes the fourth connecting piece through the fifth inclined plane to be close to the top support axle one side and remove, 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 appears shifting the possibility of condition in the test process.
Optionally, a dovetail block is fixed on one side of the third connecting piece, which is close to the top support shaft, and a dovetail groove is formed on one side of the second mounting groove, which is far away from the top support shaft, and the dovetail block is connected with the support column in a sliding manner 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, when being convenient for the third connecting piece along vertical removal, can not separate with the support column.
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 down resets.
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 moved downwards under the pressing action, the first connecting piece is moved under the pressing action of the jacking shaft, and the first connecting piece drives the transverse connecting rod to move through the vertical connecting rod, so that the transverse connecting rod is separated from the threaded shaft. The screw shaft stops moving downwards after losing the limiting function, so that the position of the screw shaft stopping moving downwards can be used as a starting point of a test, and the starting time of the test can be conveniently defined;
2. The third sliding block is inserted into the jacking shaft to provide a fixing effect for the jacking shaft. After the jacking shaft abuts against the first sliding block, the first sliding block pushes the second sliding block to move upwards, and therefore limiting of the second sliding block on the third sliding block is relieved. The second sliding block is used for limiting the third sliding block, so that the possibility that the third sliding block is blocked in the downward movement process of the top support shaft is reduced;
3. the second connecting piece supports and presses the third connecting piece through the fourth inclined plane in the matching groove to promote the third connecting piece to upwards move, the third connecting piece promotes the fourth connecting piece to move to be close to one side of the jacking shaft through the fifth inclined plane, the fourth connecting piece drives the limiting rod to move, the limiting rod provides support for the asphalt test piece after moving, and the possibility that the asphalt test piece is shifted in the test process is reduced.
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 cross-sectional view taken along line A-A of fig. 1.
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.
Reference numerals illustrate: 1. a base; 11. a water tank; 12. a cross bar; 13. a fixing frame; 14. a vertical rod; 15. a third spring; 16. a third inclined surface; 2. a mounting box; 21. a cylinder; 22. an internally threaded tube; 23. a drive gear; 24. a motor; 25. a circular through hole; 26. a third guide member; 27. a third guide groove; 28. a threaded shaft; 29. pressing head; 3. a support column; 31. a chute; 32. a top support shaft; 33. an asphalt test piece; 34. square through holes; 35. a limiting piece; 36. a first inclined surface; 37. a second inclined surface; 4. a fixing assembly; 41. a first slider; 42. a second slider; 43. a third slider; 44. a first connection 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 connector; 52. a vertical connecting rod; 53. a transverse connecting rod; 54. a bar-shaped limit groove; 55. a first mounting groove; 56. a second mounting groove; 57. a first guide; 58. a first guide groove; 6. a limit component; 61. a second connector; 62. a third connecting member; 63. a fourth connecting member; 64. a fourth spring; 65. a mating groove; 66. a fourth inclined surface; 67. dovetail blocks; 68. a dovetail groove; 7. a limit rod; 71. a third mounting groove; 72. a second guide piece; 73. a second guide groove; 74. a fifth inclined surface; 75. a fifth spring; 76. a driven gear.
Detailed Description
The application is described in further detail below with reference to fig. 1-6.
The embodiment of the application discloses a low-temperature cracking resistance test system for an asphalt pavement. 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 low-temperature environment temperature is simulated by placing the asphalt board to be tested in the water cooling liquid. The top of the base 1 is fixed with a fixing frame 13; 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 rod 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 thread 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. The driven gear 76 is rotatably mounted on the inner bottom surface of the mounting box 2. The cylinder 21 is used for pushing the internally threaded tube 22 to move downwards; the motor 24 is used to drive the rotation of the internally threaded tube 22. The top surface of the driven gear 76 is provided with a circular through hole 25 for penetrating the internal thread pipe 22, the inner circumferential surface of the circular through hole 25 is fixedly provided with two third guide pieces 26, the outer circumferential surface of the internal thread pipe 22 is provided with two third guide grooves 27, and the third guide pieces 26 are in sliding connection with the internal thread pipe 22 through the third guide grooves 27; the third guide groove 27 provides a guide function for the third guide 26 so that the driven gear 76 rotates the internally threaded tube 22. The internal thread pipe 22 is internally connected with a thread shaft 28 in a threaded manner, and a pressing head 29 is fixed at the bottom end of the thread shaft 28. Through threaded shaft 28 and female screw tube 22 threaded connection, when threaded shaft 28 receives along vertical spacing effect, threaded shaft 28 can drive the downward movement of pressure head 29.
Referring to fig. 3, a chute 31 is provided at the top of the support column 3. The support column 3 is connected with a support shaft 32 in a vertical sliding manner through a chute 31; the jacking shaft 32 is used to provide support for the asphalt test piece 33. The support column 3 is internally provided with a fixing component 4 for fixing the support 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.
Referring to fig. 4 and 5, the fixing assembly 4 includes a first slider 41 slidably connected to the support column 3 in the width direction of the support column 3, a second slider 42 slidably connected to the support column 3 in the vertical direction, and a third slider 43 for inserting with the side wall of the support column 3; the third slider 43 provides a fixing action for the jack-up shaft 32, thereby fixing the jack-up shaft 32 inside the support column 3. The side wall of the chute 31 is provided with a first connecting groove 44 and a third connecting groove 45; the slide groove 31 is slidably connected with the first slider 41 through a first connecting groove 44, and the support column 3 is slidably connected with the third slider 43 along the width direction of the support column 3 through a third connecting groove 45. A return spring 48 is fixed on one side, far away from the top support shaft 32, of the third sliding block 43, and one end, far away from the third sliding block 43, of the return spring 48 is fixedly connected with the support column 3 through a third connecting groove 45; the return spring 48 provides the third slider 43 with an elastic force to the side close to the jack shaft 32, so as to drive the third slider 43 to return to 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 on the top of the second sliding block 42, and the top end of the first spring 46 is fixedly connected with the support 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 sliding block 43 is formed in one side, close to the top supporting shaft 32, of the second sliding block 42, and a square limiting piece 35 for being inserted into the top of the third sliding block 43 is fixed on the inner top surface of the square through hole 34. The limiting member 35 is configured to provide a limiting effect for the third slider 43, so that the top support shaft 32 is not blocked by the third slider 43 when moving downward.
Referring to fig. 3 and 4, the first slider 41 and the opposite inner side of the top support shaft 32 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 second inclined surfaces 37 are respectively formed on the opposite inner sides of the first slider 41 and the second slider 42. The first slider 41 is pressed by the top support shaft 32 through the first inclined surface 36, the first slider 41 is pushed to move towards the side far away from the top support shaft 32, the second slider 42 is pressed by the first slider 41 through the second inclined surface 37, the second slider 42 is pushed to move upwards, in the moving process of the second slider 42, the limiting piece 35 is separated from the third slider 43, and the reset spring 48 is convenient to drive the third slider 43 to be inserted into the top support shaft 32, so that the top support shaft 32 is fixed.
Referring to fig. 3 and 4, the start-stop assembly 5 includes a square first link 51 slidably coupled to the support column 3 in the width direction of the support column 3, and a vertical link 52 fixed to a side of the first link 51 remote from the top support shaft 32. A transverse connecting rod 53 is fixed to the top end of the vertical connecting rod 52 and on the side close to the first connecting piece 51. Two bar-shaped limiting grooves 54 are formed in the outer 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 vertically through the bar-shaped limiting grooves 54. The side of the chute 31 far away from the first connecting groove 44 is provided with a first mounting groove 55, and the support column 3 is slidably connected with the first connecting piece 51 through the first mounting groove 55. The first connecting piece 51 and the opposite inner sides of the jacking shaft 32 are respectively provided with a third inclined plane 16. The second mounting groove 56 has been seted up at first mounting groove 55 top, and support column 3 slides through second mounting groove 56 along support column 3 width direction and is connected with vertical connecting rod 52. The supporting shaft 32 moves downwards and contacts with the first connecting piece 51, the supporting shaft 32 presses the first connecting piece 51 through the third inclined surface 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 bottom of the first connecting piece 51 is fixed with a first guide piece 57, a first guide groove 58 is formed in the bottom surface of the first mounting groove 55, and the first guide piece 57 is slidably connected with the support column 3 through the first guide groove 58. A third spring 15 is fixed on the side of the first guide 57 away from the top support shaft 32, and the third spring 15 is fixedly connected with the support column 3 through a first guide groove 58.
Referring to fig. 3 and 6, the spacing assembly 6 includes a second connector 61 fixed to one side of the vertical connection rod 52 near the lateral connection rod 53, a third connector 62 slidably connected to the support column 3 in the vertical direction, and a fourth connector 63 slidably connected to the support column 3 in the width direction of the support column 3. The second connecting piece 61 and the third connecting piece 62 are slidably disposed in the second mounting groove 56. 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 of the matching groove 65 close to the top support shaft 32 are 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 on one side of the second mounting groove 56 far away from the top support shaft 32, and the dovetail block 67 is vertically connected with the support column 3 in a sliding manner through the dovetail groove 68; by the sliding fit of the dovetail block 67 with the dovetail groove 68, support is provided for the third link 62, reducing the likelihood of the third link 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. A third mounting groove 71 is formed in the side, close to the top support shaft 32, of the second mounting groove 56, and the support column 3 is slidably connected with the third connecting piece 62 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 slidably connected with the second guide groove 73 along the width direction of the support column 3. A fifth spring 75 is fixed on one side of the second guide piece 72 close to the top support shaft 32, and the fifth spring 75 is fixedly connected with the support column 3 through a second guide groove 73. 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 at the top of the fourth connecting piece 63. 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 provided by the embodiment of the application is as follows:
The low-temperature environment is created by adding water into the water tank 11, and the asphalt test piece 33 is placed into the water tank 11 to be soaked for 10-20min. An asphalt test piece 33 is placed on top of the jacking 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 internally threaded tube 22 to rotate. At this time, the transverse connecting rod 53 is in an inserting state with the bar-shaped limit groove 54 of the threaded shaft 28, and the threaded shaft 28 drives the pressing head 29 to move downwards in the process of connecting the internal threaded tube 22 with the threaded shaft 28 in a threaded manner.
The pressing head 29 is contacted with the asphalt test piece 33 and then presses the asphalt test piece 33 downwards, the first sliding block 41 is pressed by the first inclined surface 36 in the downward moving process of the propping shaft 32, the first sliding block 41 is pushed to move towards the side far away from the propping shaft 32, the first sliding block 41 is pressed by the second inclined surface 37 and pushes the second sliding block 42 to move upwards, in the moving process of the second sliding block 42, the limiting piece 35 is separated from the third sliding block 43, and the reset spring 48 is convenient for driving the third sliding block 43 to be spliced with the propping shaft 32, so that the propping shaft 32 is fixed.
The propping shaft 32 contacts with the first connecting piece 51 in the downward moving process, the propping shaft 32 props against the first connecting piece 51 through the third inclined surface 16 and pushes the first connecting piece 51 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 does not move downward any further after losing its limit.
Meanwhile, the second connecting piece 61 pushes against the third connecting piece 62 to move upwards through the fourth inclined surface 66 arranged in the matching groove 65, and the third connecting piece 62 pushes against the fourth connecting piece 63 through the fifth inclined surface 74 and pushes the fourth connecting piece 63 to move towards the side close to the top supporting shaft 32. The limiting rod 7 is abutted against the asphalt test piece 33 in the moving process along with the fourth connecting piece 63, the asphalt test piece 33 is not limited, and the possibility that the asphalt test piece 33 is shifted in the measuring process is reduced.
After the cylinder 21 is started, the cylinder 21 pushes the internal thread pipe 22 to move downwards, and the internal thread pipe 22 drives the pressing head 29 to press the asphalt test piece 33 downwards through the thread shaft 28, so that the low-temperature cracking resistance test is performed.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (10)
1. The utility model provides an asphalt pavement low temperature cracking resistance performance test system, includes base (1), is fixed in basin (11) at base (1) top and be fixed in two support column (3) of basin (11) bottom, its characterized in that: a fixing frame (13) is fixed at the top of the base (1); an installation box (2) is fixed on one side of the fixing frame (13) close to the water tank (11), and an internal thread pipe (22) is arranged in the installation box (2) in a penetrating manner; the internal thread pipe (22) is internally connected with a thread shaft (28), and a pressing head (29) is fixed at the bottom end of the thread shaft (28); a driving component for driving the internal thread pipe (22) to rotate is arranged in the mounting box (2); a top support shaft (32) is connected in the support column (3) in a sliding manner along the vertical direction; a first connecting piece (51) is slidingly connected in the support column (3) along the width direction of the support column (3); a vertical connecting rod (52) is fixed on one side, far away from the top support shaft (32), of the first connecting piece (51); a transverse connecting rod (53) is fixed at the top end of the vertical connecting rod (52); two bar-shaped limiting grooves (54) are formed in the outer peripheral surface of the threaded shaft (28), and the threaded shaft (28) is slidably connected with the end part of the transverse connecting rod (53) through the bar-shaped limiting grooves (54); the first connecting piece (51) and the opposite inner sides of the jacking shaft (32) are respectively provided with a third inclined plane (16).
2. The asphalt pavement low-temperature cracking resistance test system according to claim 1, wherein: a chute (31) is formed in the top of the support column (3); the support column (3) is connected with the top support shaft (32) in a sliding way through the sliding groove (31); a first mounting groove (55) is formed in one side of the sliding groove (31), and the support column (3) is slidably connected with the first connecting piece (51) through the first mounting groove (55); a second mounting groove (56) is formed in the top of the first mounting groove (55), and the support column (3) is connected with the vertical connecting rod (52) in a sliding manner along the width direction of the support column (3) through the second mounting groove (56); the fixing component (4) used for fixing the support column (3) and the limiting component (6) used for limiting the asphalt test piece (33) are arranged in the support column (3).
3. The asphalt pavement low-temperature cracking resistance test system 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 support column (3) in a sliding manner through the first guide groove (58); a third spring (15) is fixed on one side, far away from the top support shaft (32), of the first guide piece (57), and the third spring (15) is fixedly connected with the support column (3) through a first guide groove (58).
4. The asphalt pavement low-temperature cracking resistance test system 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 internally threaded tube (22) is rotationally connected with a piston rod of the air cylinder (21); a driving gear (23) is fixed at the output end of the motor (24); the inner bottom surface of the mounting box (2) is rotatably provided with a driven gear (76); the driven gear (76) is connected with the internal thread pipe (22) in a sliding manner along the vertical direction.
5. The asphalt pavement low-temperature cracking resistance test system according to claim 4, wherein: the driven gear (76) top surface has seted up circular through-hole (25) that are used for wearing to establish internal thread pipe (22), circular through-hole (25) inner peripheral surface is fixed with two third guide (26), two third guide grooves (27) have been seted up to internal thread pipe (22) outer peripheral surface, third guide (26) are connected with internal thread pipe (22) through third guide groove (27) slip.
6. The asphalt pavement low-temperature cracking resistance test system according to claim 2, wherein: the fixing assembly (4) comprises a first sliding block (41) which is connected with the support column (3) in a sliding manner along the width direction of the support column (3), a second sliding block (42) which is connected with the support column (3) in a sliding manner along the vertical direction, and a third sliding block (43) which is used for being spliced with the side wall of the support 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 way through the first connecting groove (44), and the supporting column (3) is connected with the third sliding block (43) in a sliding way along the width direction of the supporting column (3) through the 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 top supporting shaft (32), of the second sliding block (42), and a limiting piece (35) for being inserted into the top of the third sliding block (43) is fixed on the inner top surface of the square through hole (34); the first inclined planes (36) are respectively formed on the inner sides of the first sliding block (41) and the opposite inner sides of the top supporting shaft (32), and the second inclined planes (37) are respectively formed on the inner sides of the first sliding block (41) and the opposite inner sides of the second sliding block (42).
7. The asphalt pavement low-temperature cracking resistance test system according to claim 6, wherein: and a return spring (48) is fixed on one side, far away from the top support shaft (32), of the third sliding block (43), and one end, far away from the third sliding block (43), of the return spring (48) is fixedly connected with the support column (3) through a third connecting groove (45).
8. The asphalt pavement low-temperature cracking resistance test system 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 manner along the vertical direction, and a fourth connecting piece (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); a matching groove (65) is formed in the top of the second connecting piece (61), and a fourth inclined plane (66) is formed in the bottom of the third connecting piece (62) and one side, close to the jacking shaft (32), of the matching groove (65); a third mounting groove (71) is formed in one side, close to the top support shaft (32), of the second mounting groove (56), and the support column (3) is slidably connected with a third connecting piece (62) 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); and a limiting rod (7) is fixed at the top of the fourth connecting piece (63).
9. The asphalt pavement low-temperature cracking resistance test system according to claim 8, wherein: and a dovetail block (67) is fixed on one side, close to the jacking shaft (32), of the third connecting piece (62), a dovetail groove (68) is formed in one side, far away from the jacking shaft (32), of the second mounting groove (56), and the dovetail block (67) is connected with the support column (3) in a sliding manner through the dovetail groove (68).
10. The asphalt pavement low-temperature cracking resistance test system according to claim 9, wherein: a fourth spring (64) is fixed at the top of the dovetail block (67), and the top end of the fourth spring (64) is fixedly connected with the support column (3) through a dovetail groove (68).
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