Method for determining the fiber density of asphalt mixtures

Abstract

The application discloses a fiber density determination method for asphalt mixture, belongs to the technical field of fiber density determination for asphalt mixture, and comprises a specific gravity bottle, a vacuum container and a vacuum pumping device. The vacuum pumping device comprises a base, a vibration table mounted on the base and a gas pumping pump. The vacuum container comprises a mounting cylinder and a top cover. A bearing frame is mounted in the mounting cylinder. The bearing frame comprises a bearing plate for bearing the specific gravity bottle and a clamping frame for clamping the specific gravity bottle. The bottom surface of the bearing plate is fixed with a connecting block. The bottom surface of the mounting cylinder is provided with a connecting groove for inserting the connecting block. The opposite inner sides of the connecting groove are provided with positioning grooves. The mounting cylinder is slidably mounted with a positioning block along the radial direction of the mounting cylinder through the positioning grooves. The two sides of the connecting block are provided with fixing grooves for inserting the positioning block. The application can quickly discharge the bubbles in the specific gravity bottle.

Description

Technical Field

[0001] This application relates to the technical field of fiber density determination for asphalt mixtures, and in particular to a method for determining fiber density for asphalt mixtures. Background Technology

[0002] Asphalt mixtures are mixtures made by combining asphalt binders and mineral aggregates (aggregates, fillers). To improve the performance of asphalt mixtures, modifying materials are added to the asphalt binders or mixtures. Fibers (wood fibers, polymer fibers, mineral fibers) can improve the performance of asphalt mixtures.

[0003] The addition of fibers typically makes asphalt mixtures more viscous and difficult to disperse. The relative density test results of the components in an asphalt mixture are a prerequisite for calculating the theoretical maximum relative density of the mixture. When determining the relative density of fibers used in asphalt mixtures, operators need to measure the mass of the fibers after they are miscible with water. To ensure the accuracy of the measurement results, air bubbles on the fiber surface need to be eliminated. This is usually done by vacuuming the sample. A specific gravity bottle filled with water and the fiber to be tested is placed in a vacuum container filled with water, and the vacuum container is evacuated. This allows water from the vacuum container to enter the specific gravity bottle through the stopper, thus eliminating air bubbles in the specific gravity bottle.

[0004] Regarding the aforementioned related technologies, the inventors believe that when removing air bubbles from a specific gravity bottle by vacuuming, in order to prevent water in the vacuum container from being sucked into the vacuum pump and causing the lubricating oil in the vacuum pump to deteriorate, the water level in the vacuum container should be lower than the top of the vacuum container. Since the bottle stopper on the specific gravity bottle cannot be guaranteed to be always immersed in water when the specific gravity bottle is placed in the vacuum container, the efficiency of air bubble removal is low. Summary of the Invention

[0005] To address the issue of low efficiency in removing air bubbles from the specific gravity bottle during measurement, this application provides a method for determining the fiber density of asphalt mixtures.

[0006] The method for determining the fiber density of asphalt mixtures provided in this application adopts the following technical solution, including the following steps:

[0007] S1. Weighing the specific gravity bottle to obtain the mass... ;

[0008] S2. Weigh the hydrometer bottle filled with water to obtain the mass of the bottle. ;

[0009] S3. Weigh the specific gravity bottle containing the fiber sample to be tested to obtain the mass of the sample. ;

[0010] S4. Fill the specific gravity bottle containing the fiber sample to be tested with water, place the specific gravity bottle in a vacuum container, add water to the vacuum container, and use a vacuum pump to evacuate the vacuum container. After evacuation, remove the specific gravity bottle and weigh it to obtain the mass. ;

[0011] S5. Calculate the density and relative density of the fiber sample to be tested according to the following formulas:

[0012]

[0013]

[0014] in, The relative density of the fiber sample to be tested is dimensionless. The density of the fiber sample to be tested; The mass of the specific gravity bottle after drying; The total mass of the specific gravity bottle and the water it is filled with; The total mass of the specific gravity bottle and the fiber sample to be tested contained therein; The total mass of the specific gravity bottle, the fiber sample to be tested, and the water filling it; The density of water at a preset temperature;

[0015] The vacuuming device includes a base, a vibration table mounted on the base, and a vacuum pump. The vacuum container includes a mounting cylinder and a top cover. A support frame is installed inside the mounting cylinder. The support frame includes a support plate for supporting the specific gravity bottle and a clamping frame for holding the specific gravity bottle. A connecting block is fixed on the bottom surface of the support plate. A connecting groove for inserting the connecting block is opened on the bottom surface of the mounting cylinder. Positioning grooves are opened on the opposite inner sides of the connecting groove. The mounting cylinder slides radially along its own axis through the positioning groove to install the positioning block. Fixing grooves for inserting the positioning block are opened on both sides of the connecting block.

[0016] By adopting the above technical solution, the specific gravity bottle is placed on the support plate, and the specific gravity bottle is clamped by the clamping frame. Then, the connecting block is inserted into the connecting groove, and the positioning block is inserted into the fixing groove, thereby fixing the support plate and the mounting cylinder. When the mounting cylinder vibrates on the vibration table, the mounting cylinder drives the support plate to vibrate, and transmits the vibration to the specific gravity bottle through the support plate, causing the specific gravity bottle to shake, so as to remove air bubbles in the specific gravity bottle and improve the test efficiency.

[0017] Preferably, the positioning block has a reset groove on its side, and a reset block passing through the reset groove is fixed to the inner wall of the positioning groove. A spring is fixed to the side of the reset block away from the connecting groove, and the end of the spring away from the reset block is fixedly connected to the inner wall of the reset groove. The bottom surface of the mounting cylinder has an abutment groove communicating with the positioning groove. An abutment block is installed on the mounting cylinder by sliding vertically through the abutment groove. A spring is fixed to the bottom surface of the abutment block, and the bottom surface of the spring is fixedly connected to the inner bottom surface of the abutment groove. The side of the abutment block has an abutment groove for the positioning block to pass through. The bottom surface of the abutment groove has an inclined surface. The side of the positioning block away from the connecting groove has an inclined surface two that can abut against the inclined surface one.

[0018] By adopting the above technical solution, the connecting block is inserted into the connecting groove, and the abutting block moves upward. The abutting block abuts against the inclined surface one and the inclined surface two, pushing the positioning block to move towards the connecting block and inserting it into the fixing groove, thereby fixing the bearing plate and the mounting cylinder. After the abutting block moves downward, the abutting block resets upward under the elastic force of the second spring, and the positioning block resets under the elastic force of the first spring, so that the positioning block disengages from the fixing groove, so as to separate the bearing plate from the mounting cylinder.

[0019] Preferably, the inner wall of the mounting cylinder is provided with a dovetail groove, and a dovetail block one and a dovetail block two are mounted on the mounting cylinder by sliding vertically through the dovetail groove. The bottom surface of the dovetail block one can abut against the top surface of the dovetail block two, and the dovetail block two is fixedly connected to the side of the abutting block. A fixing rod is fixed to the top of the dovetail groove, and a spring is wound around the outer periphery of the fixing rod. One end of the spring is fixedly connected to the outer periphery of the fixing rod, and the other end of the spring is fixedly connected to the top surface of the dovetail block one. A limiting groove is provided on the inner wall of the mounting cylinder, and a float is mounted on the mounting cylinder by sliding vertically through the limiting groove. A connecting groove communicating with the dovetail groove is provided on the inner wall of the limiting groove. A pull rope is fixed to the bottom surface of the float, and the end of the pull rope away from the float passes through the connecting groove and is fixedly connected to the bottom surface of the dovetail block one.

[0020] By adopting the above technical solution, when the installation cylinder is not filled with water, the first dovetail block is located at the top of the installation cylinder under the action of the spring. During the process of filling the installation cylinder with water, the water level in the installation cylinder rises, and the float moves upward with the water level. The float moves the first dovetail block downward through the pull rope. When the first dovetail block moves to the bottom, it abuts against the second dovetail block and pushes the abutting block to move downward. The abutting block pushes the positioning block to be inserted into the fixed groove.

[0021] Preferably, guide blocks are fixed on both sides of the float, and a guide groove is provided on the inner wall of the limiting groove. The guide blocks are slidably connected to the mounting cylinder plate in the vertical direction through the guide groove.

[0022] By adopting the above technical solution, when the float moves in the limiting groove, the guide block moves in the guide groove, so that the float is not easy to get out of the limiting groove, and the float moves vertically.

[0023] Preferably, a support rod is fixed on both sides of the support plate, and a support block is fixed on the side of the dovetail block near the support rod. A clearance groove is opened on the side of the support block near the support rod, and the support rod is slidably connected to the support block in the vertical direction through the clearance groove.

[0024] By adopting the above technical solution, when the dovetail block one is located at the top of the mounting cylinder under the elastic force of the spring, the bearing plate is located at the top of the mounting cylinder, so that the operator can place the specific gravity bottle on the bearing plate, and the bottom surface of the bearing rod abuts against the bottom surface of the relief groove; when the water level in the mounting cylinder gradually rises, the float moves upward, the dovetail block one drives the bearing plate to move downward, after the connecting block is inserted into the connecting groove, the dovetail block one continues to move downward and pushes the dovetail block two downward, so that the positioning block is inserted into the fixing groove. At this time, the top surface of the bearing rod abuts against the inner top surface of the relief groove, thereby fixing the bearing plate and the mounting cylinder.

[0025] Preferably, the top surface of the support plate has a plurality of placement slots for placing the specific gravity bottle, the clamping frame includes a clamping plate disposed above the support plate, the top surface of the clamping plate has a movable through slot for passing through the specific gravity bottle, the inner wall of the movable through slot has a clamping ring groove, a plurality of rotating blocks and a plurality of clamping rods are installed in the clamping ring groove, the clamping rods are spaced apart circumferentially along the movable through slot, the top surface of the clamping rod has a displacement groove, the rotating blocks move along the length direction of the clamping rod through the displacement groove, the end of the clamping rod can abut against the top of the specific gravity bottle, and the clamping plate is provided with a driving component for driving the clamping rod to rotate into the movable through slot.

[0026] By adopting the above technical solution, the specific gravity bottle is placed in the placement groove, and the clamping rod is rotated so that the end of the clamping rod abuts against the top surface of the specific gravity bottle, so that the specific gravity bottle is not easy to move upward and can vibrate with the installation cylinder to facilitate the removal of air bubbles in the specific gravity bottle.

[0027] Preferably, the driving component includes a gear rotatably mounted in the clamping ring groove, the gear rotatably connected to the end of the clamping rod away from the moving through groove, and a connecting ring groove communicating with the clamping ring groove is opened on the outer peripheral surface of the clamping plate. A first internal gear meshing with the gear rotatably is mounted in the connecting ring groove.

[0028] By adopting the above technical solution, the first internal gear is rotated, which drives the first gear to rotate, and the first gear drives the clamping rod to rotate, so that the end of the clamping rod away from the first gear abuts against the top surface of the specific gravity bottle.

[0029] Preferably, the top surface of the first internal gear is provided with a slot, the top surface of the clamping plate is provided with a fixing through slot, the clamping plate is vertically slidably mounted with a block that can be inserted into the slot through the fixing through slot, the side of the block is provided with a sliding groove, the inner wall of the fixing through slot is fixed with a slider that passes through the sliding groove, the bottom surface of the slider is fixed with a spring three, and the bottom end of the spring three is fixedly connected to the bottom surface of the sliding groove.

[0030] By adopting the above technical solution, when the first internal gear is rotated until the clamping rod abuts against the specific gravity bottle, the slot is located below the fixed through slot, and the clamping block is inserted into the slot under the elastic force of the spring three, so that the first internal gear and the clamping plate remain relatively fixed, and the clamping rod clamps and fixes the specific gravity bottle.

[0031] Preferably, the bottom surface of the clamping plate is fixed with four adjusting screws, the top surface of the bearing plate is provided with an adjusting through hole, a second gear is rotatably installed in the adjusting through hole, the top surface of the second gear is provided with an adjusting through groove for passing through the adjusting screws, the inner circumferential surface of the adjusting through groove is provided with threads, the adjusting screws and the second gear are threadedly driven together, the outer circumferential surface of the bearing plate is provided with a receiving groove, a second internal gear that meshes with the second gear is rotatably installed in the receiving groove.

[0032] By adopting the above technical solution, the second internal gear is rotated, which drives the second gear to rotate. The second gear drives the adjusting screw to move vertically, thereby adjusting the distance between the clamping plate and the bearing plate, so that the end of the clamping rod can abut against the top surface of the specific gravity bottle.

[0033] Preferably, a ratchet is fixedly fitted onto the outer circumferential surface of the second internal gear, a pawl is rotatably mounted on the bottom surface of the receiving groove, the pawl can be inserted into the tooth groove of the ratchet, a receiving block is fixed on the bottom surface of the receiving groove, a spring four is fixed on the side of the receiving block near the pawl, and the end of the spring four away from the receiving block is fixedly connected to the side of the pawl away from the ratchet.

[0034] By adopting the above technical solution, under the action of the ratchet and pawl, the second internal gear can only rotate in one direction, so the second gear can only rotate in one direction, making it impossible for the clamping plate to move away from the bearing plate without the action of external force, thereby ensuring that the end of the clamping rod abuts against the top surface of the specific gravity bottle.

[0035] In summary, this application includes at least one of the following beneficial technical effects:

[0036] 1. Place the specific gravity bottle on the support plate and clamp it with the clamping frame. Then insert the connecting block into the connecting groove and the positioning block into the fixing groove, thereby fixing the support plate and the mounting cylinder. When the mounting cylinder vibrates on the vibration table, the mounting cylinder drives the support plate to vibrate and transmits the vibration to the specific gravity bottle through the support plate, causing the specific gravity bottle to shake, so as to remove air bubbles in the specific gravity bottle and improve the test efficiency.

[0037] 2. Insert the connecting block into the connecting groove, move the abutting block upward, the abutting block abuts against each other through inclined surface one and inclined surface two, push the positioning block to move towards the connecting block and insert it into the fixing groove, thereby fixing the bearing plate and the mounting cylinder; after the abutting block moves downward, the abutting block returns to its original position under the elastic force of spring two, and the positioning block returns to its original position under the elastic force of spring one, so that the positioning block disengages from the fixing groove, so as to separate the bearing plate from the mounting cylinder;

[0038] 3. When the installation cylinder is empty, the first dovetail block is located at the top of the installation cylinder under the action of the spring. During the process of filling the installation cylinder with water, the water level in the installation cylinder rises, and the float moves upward with the water level. The float moves the first dovetail block downward through the pull rope. When the first dovetail block moves to the bottom, it abuts against the second dovetail block and pushes the abutting block downward. The abutting block pushes the positioning block to be inserted into the fixed groove. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the vacuum device and vacuum container in the fiber density determination method for asphalt mixtures according to an embodiment of this application.

[0040] Figure 2 This is a cross-sectional view of the installation cylinder in the fiber density determination method for asphalt mixtures according to an embodiment of this application.

[0041] Figure 3 This is a schematic diagram of the structure of the support frame and clamping frame in the fiber density determination method for asphalt mixtures according to an embodiment of this application.

[0042] Figure 4 yes Figure 3 Enlarged diagram of point A in the middle.

[0043] Figure 5 yes Figure 3 Enlarged diagram of point B in the middle.

[0044] Figure 6 This is a schematic diagram of the structure of the abutment block and the positioning block in the fiber density determination method for asphalt mixtures according to an embodiment of this application.

[0045] Reference numerals: 1. Vacuuming device; 11. Base; 12. Vibration table; 13. Vibration groove; 14. Vacuum container; 15. Mounting cylinder; 16. Top cover; 17. Air pump; 18. Air extraction pipe; 2. Locking plate; 21. Locking through hole; 22. Locking screw; 23. Locking nut; 3. Bearing frame; 31. Bearing plate; 32. Placement groove; 33. Bearing rod; 34. Dovetail block one; 35. Bearing block; 36. Clearance groove; 37. Dovetail groove; 4. Fixing rod; 41. Spring; 42. Limiting groove; 43. Float; 44. Guide block; 45. Guide groove; 46. Pull rope; 5. Clamping frame; 51. Clamping plate; 52. Moving through groove; 53. Clamping ring groove; 54. Clamping rod; 55. Displacement groove; 5 6. Rotating block; 57. Gear 1; 58. Connecting ring groove; 59. First internal gear; 6. Locking block; 61. Locking groove; 62. Sliding groove; 63. Fixing through groove; 64. Sliding block; 65. Spring 3; 7. Adjusting screw; 71. Adjusting through hole; 72. Gear 2; 73. Adjusting through groove; 74. Receiving groove; 75. Second internal gear; 76. Ratchet; 77. Pawl; 78. Receiving block; 79. Spring 4; 8. Connecting block; 81. Connecting groove; 82. Positioning block; 83. Positioning groove; 84. Fixing groove; 85. Reset through groove; 86. Reset block; 87. Spring 1; 9. Abutting block; 91. Abutting groove; 92. Spring 2; 93. Abutting through groove; 94. Inclined surface 1; 95. Inclined surface 2; 96. Dovetail block 2. Detailed Implementation

[0046] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0047] This application discloses a method for determining the fiber density of asphalt mixtures. (Refer to...) Figure 1 and Figure 2 The method for determining the fiber density of asphalt mixtures includes the following steps:

[0048] S1. Weighing the specific gravity bottle to obtain the mass... ;

[0049] S2. Weigh the hydrometer bottle filled with water to obtain the mass of the bottle. ;

[0050] S3. Weigh the specific gravity bottle containing the fiber sample to be tested to obtain the mass of the sample. ;

[0051] S4. Fill the specific gravity bottle containing the fiber sample to be tested with water, place the specific gravity bottle inside the vacuum container 14, add water to the vacuum container 14, and use the vacuum pumping device 1 to evacuate the vacuum container 14. After the vacuuming is completed, remove the specific gravity bottle and weigh it to obtain the mass. ;

[0052] S5. Calculate the density and relative density of the fiber sample to be tested according to the following formulas.

[0053]

[0054]

[0055] in, The relative density of the fiber sample to be tested is dimensionless. The density of the fiber sample to be tested; The mass of the specific gravity bottle after drying; The total mass of the specific gravity bottle and the water it is filled with; The total mass of the specific gravity bottle and the fiber sample to be tested contained therein; The total mass of the specific gravity bottle, the fiber sample to be tested, and the water filling it; This is the density of water at a preset temperature.

[0056] Reference Figure 1 and Figure 2 The vacuum device 1 includes a base 11 and a vibration table 12 mounted on the base 11. The top surface of the vibration table 12 has a vibration groove 13 for placing a vacuum container 14. The vacuum container 14 includes a mounting cylinder 15 and a top cover 16 covering the top of the mounting cylinder 15. A support frame 3 for placing a specific gravity bottle is installed inside the vacuum container 14. A vacuum pump 17 is mounted on the base 11, and the vacuum pipe 18 of the vacuum pump 17 is fixedly connected to the top cover 16. Two vertically arranged locking screws 22 are fixed on the top surface of the base 11. A locking plate 2 is provided on the top cover 16. The top surface of the locking plate 2 has a locking through hole 21 for passing through the locking screws 22. A locking nut 23 is sleeved on the outer periphery of the locking screw 22. The locking nut 23 can abut against the top surface of the locking plate 2, and the bottom surface of the locking plate 2 can abut against the top surface of the top cover 16.

[0057] After placing the specific gravity bottle inside the mounting cylinder 15, cover it with the top cover 16, put the locking plate 2 on the locking screw 22, and tighten the locking nut 23 so that the locking plate 2 abuts against the top cover 16, making it difficult for the top cover 16 to separate from the mounting cylinder 15.

[0058] Reference Figure 2The support frame 3 includes a support plate 31 and a clamping frame 5 for holding the specific gravity bottle. The top surface of the support plate 31 has four placement slots 32 for placing the specific gravity bottle, and the four placement slots 32 are evenly spaced along the circumference of the support plate 31. Dovetail grooves 37 are respectively formed on the opposite inner sides of the mounting cylinder 15, and dovetail blocks 34 are vertically slidably mounted on the mounting cylinder 15 through the dovetail grooves 37. Two symmetrically arranged support rods 33 are fixed to the outer circumferential surface of the support plate 31. A support block 35 is fixed to the side of the dovetail block 34 near the support rods 33. A clearance groove 36 is formed on the side of the support block 35 near the support rods 33, and the support rods 33 are vertically slidably connected to the support block 35 through the clearance groove 36.

[0059] When the bearing rod 33 is inserted into the relief groove 36, and the dovetail block 34 moves the bearing block 35 downward, the bottom surface of the bearing rod 33 abuts against the bottom surface of the relief groove 36 and moves downward with the dovetail block 34.

[0060] Reference Figure 2 A fixing rod 4 is fixed to the top of the dovetail groove 37. A spring 41 is wound around the outer periphery of the fixing rod 4. One end of the spring 41 is fixedly connected to the outer periphery of the fixing rod 4, and the other end of the spring 41 is fixedly connected to the top surface of the dovetail block 34. A limiting groove 42 is formed in the inner wall of the mounting cylinder 15. A float 43 is mounted on the mounting cylinder 15 by sliding vertically through the limiting groove 42. Guide blocks 44 are fixed on both sides of the float 43. A guide groove 45 is formed in the inner wall of the limiting groove 42. The guide blocks 44 are slidably connected to the mounting cylinder 15 plate by sliding vertically through the guide groove 45. A connecting groove communicating with the dovetail groove 37 is formed in the inner wall of the limiting groove 42. A pull rope 46 is fixed to the bottom surface of the float 43. The end of the pull rope 46 away from the float 43 passes through the connecting groove and is fixedly connected to the bottom surface of the dovetail block 34.

[0061] When the mounting cylinder 15 is empty of water, the dovetail block 34 is positioned at the top of the mounting cylinder 15 under the action of the spring 41, so that the operator can place the specific gravity bottle on the support plate 31. During the process of adding water into the mounting cylinder 15, the float 43 gradually rises with the water level. The float 43 drives the dovetail block 34 to move downward through the pull rope 46, so that the dovetail block 34 drives the support plate 31 and the specific gravity bottle to move downward.

[0062] Reference Figure 3 and Figure 4The clamping frame 5 includes a clamping plate 51, the top surface of which has four movable slots 52 for passing through the specific gravity bottle. The inner wall of each movable slot 52 has a clamping ring groove 53, within which are installed several rotating blocks 56 and several clamping rods 54. Each rotating block 56 corresponds to one clamping rod 54, and the end of each clamping rod 54 can abut against the top of the specific gravity bottle. The clamping rods 54 are spaced apart circumferentially along the movable slots 52, and the top surface of each clamping rod 54 has a displacement groove 55 through which the rotating blocks 56 move along the length of the clamping rod 54. A gear 57 is rotatably mounted within the clamping ring groove 53, and the gear 57 is fixedly connected to the end of the clamping rod 54 furthest from the movable slot 52. The outer circumferential surface of the clamping plate 51 is provided with a connecting ring groove 58 that communicates with the clamping ring groove 53. A first internal gear 59 that meshes with gear 57 is rotatably installed in the connecting ring groove 58.

[0063] Reference Figure 3 and Figure 5 The top surface of the first internal gear 59 has a slot 61, and the top surface of the clamping plate 51 has a fixing through slot 63. The clamping plate 51 slides vertically along the fixing through slot 63 to install a locking block 6 that can be inserted into the slot 61. The side of the locking block 6 has a sliding groove 62, and the inner wall of the fixing through slot 63 is fixed with a slider 64 that passes through the sliding groove 62. The bottom surface of the slider 64 is fixed with a spring 65, and the bottom end of the spring 65 is fixedly connected to the bottom surface of the sliding groove 62.

[0064] After the specific gravity bottle is passed through the movable channel 52 and placed on the support plate 31, the first internal gear 59 is rotated. The first internal gear 59 drives the clamping rod 54 to rotate, so that the end of the clamping rod 54 away from the first internal gear 59 abuts against the top surface of the specific gravity bottle, so that the specific gravity bottle is not easy to move upward and separate from the support plate 31.

[0065] Reference Figure 2 and Figure 3 Four adjusting screws 7 are fixed to the bottom surface of the clamping plate 51, and the four adjusting screws 7 are evenly spaced along the circumference of the clamping plate 51. An adjusting through hole 71 is provided on the top surface of the bearing plate 31, and a second gear 72 is rotatably installed within the adjusting through hole 71. An adjusting slot 73 for the adjusting screws 7 to pass through is provided on the top surface of the second gear 72, and the inner circumferential surface of the adjusting slot 73 is threaded, allowing the adjusting screws 7 and the second gear 72 to engage in threaded transmission. A receiving groove 74 is provided on the outer circumferential surface of the bearing plate 31, and a second internal gear 75 that meshes with the second gear 72 is rotatably installed within the receiving groove 74.

[0066] Reference Figure 3A ratchet 76 is fixedly fitted onto the outer circumferential surface of the second internal gear 75. A pawl 77 is rotatably mounted on the bottom surface of the receiving groove 74, and the pawl 77 can be inserted into the tooth groove of the ratchet 76. A receiving block 78 is fixed to the bottom surface of the receiving groove 74, and a spring 79 is fixed to the side of the receiving block 78 near the pawl 77. The end of the spring 79 away from the receiving block 78 is fixedly connected to the side of the pawl 77 away from the ratchet 76.

[0067] Rotating the second internal gear 75 causes the second gear 72 to rotate, which in turn causes the adjusting screw 7 to move vertically, thereby adjusting the height of the clamping rod 54 so that the end of the clamping rod 54 can abut against the top surface of the specific gravity bottle. Under the action of the ratchet 76 and pawl 77, the adjusting screw 7 can only drive the clamping rod 54 to move downward, thereby making the connection between the specific gravity bottle and the support plate 31 tighter.

[0068] Reference Figure 3 and Figure 6 A connecting block 8 is fixed to the bottom surface of the bearing plate 31, and a connecting groove 81 for inserting the connecting block 8 is provided on the bottom surface of the mounting cylinder 15. Positioning grooves 83 are provided on the opposite inner sides of the connecting grooves 81. Positioning blocks 82 are mounted on the mounting cylinder 15 by sliding radially along the positioning grooves 83. Fixing grooves 84 for inserting the positioning blocks 82 are provided on both sides of the connecting block 8. A reset groove 85 is provided on the side of the positioning block 82, and a reset block 86 passing through the reset groove 85 is fixed to the inner wall of the positioning groove 83. A spring 87 is fixed to the side of the reset block 86 away from the connecting groove 81, and the end of the spring 87 away from the reset block 86 is fixedly connected to the inner wall of the reset groove 85.

[0069] Reference Figure 3 and Figure 6 The bottom surface of the mounting cylinder 15 has an abutment groove 91 that communicates with the positioning groove 83. The mounting cylinder 15 slides vertically along the abutment groove 91 to mount an abutment block 9. A second spring 92 is fixed to the bottom surface of the abutment block 9, and the bottom surface of the second spring 92 is fixedly connected to the inner bottom surface of the abutment groove 91. The side of the abutment block 9 has an abutment through groove 93 for the positioning block 82 to pass through. The bottom surface of the abutment through groove 93 is provided with a first inclined surface 94. The side of the positioning block 82 away from the connecting groove 81 is provided with a second inclined surface 95 that can abut against the first inclined surface 94. The mounting cylinder 15 slides vertically along the dovetail groove 37 to mount a second dovetail block 96. The second dovetail block 96 is fixedly connected to the side of the abutment block 9, and the bottom surface of the first dovetail block 34 can abut against the top surface of the second dovetail block 96.

[0070] The support plate 31 moves downward and is inserted into the connecting groove 81. The first dovetail block 34 continues to move downward and abuts against the second dovetail block 96. The first dovetail block 34 pushes the second dovetail block 96 downward. The second dovetail block 96 drives the abutting block 9 downward. The abutting block 9 abuts against the first inclined surface 94 and the second inclined surface 95, thereby pushing the positioning block 82 to move towards the connecting block 8 and insert it into the fixing groove 84, so that the support plate 31 is connected to the mounting cylinder 15.

[0071] The implementation principle of the fiber density determination method for asphalt mixtures in this application embodiment is as follows: The mounting cylinder 15 is placed in the vibration groove 13, and the specific gravity bottle is placed in the placement groove 32. The pawl 77 is separated from the ratchet 76. The second internal gear 75 is rotated to adjust the height of the clamping plate 51 so that the clamping rod 54 is positioned above the specific gravity bottle. Then, the first internal gear 59 is rotated, causing the gear 57 to rotate, so that the end of the clamping rod 54 rotates to abut against the top surface of the specific gravity bottle, thus keeping the specific gravity bottle and the supporting plate 31 relatively fixed. Water is then added to the mounting cylinder 15, and the water level in the mounting cylinder 15 rises, causing the float 43 to gradually rise with the water level. The float 43 moves the dovetail block 34 downward via the pull rope 46. The dovetail block 34 moves the bearing plate 31 downward. During the descent of the bearing plate 31, the connecting block 8 is inserted into the connecting groove 81. The bearing plate 31 stops moving downward. The dovetail block 34 abuts against the dovetail block 96 and continues to move downward. The dovetail block 96 moves the abutting block 9 downward. The abutting block 9 abuts against the inclined surface 94 and the inclined surface 95, thereby pushing the positioning block 82 to move towards the connecting block 8 and inserting it into the fixing groove 84. This fixes the bearing plate 31 to the mounting cylinder 15, so that the specific gravity bottle can vibrate with the mounting cylinder 15 to expel the air bubbles in the specific gravity bottle.

[0072] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for determining the fiber density of asphalt mixtures, characterized in that: Includes the following steps: S1. Weighing the specific gravity bottle to obtain the mass... ; S2. Weigh the hydrometer bottle filled with water to obtain the mass of the bottle. ; S3. Weigh the specific gravity bottle containing the fiber sample to be tested to obtain the mass of the sample. ; S4. Fill the specific gravity bottle containing the fiber sample to be tested with water, place the specific gravity bottle in the vacuum container (14), add water into the vacuum container (14), and use the vacuum pumping device (1) to evacuate the vacuum container (14). After the vacuuming is completed, take out the specific gravity bottle and weigh it to obtain the mass. ; S5. Calculate the density and relative density of the fiber sample to be tested according to the following formulas: ； ； in, The relative density of the fiber sample to be tested is dimensionless. The density of the fiber sample to be tested; The mass of the specific gravity bottle after drying; The total mass of the specific gravity bottle and the water it is filled with; The total mass of the specific gravity bottle and the fiber sample to be tested contained therein; The total mass of the specific gravity bottle, the fiber sample to be tested, and the water filling it; The density of water at a preset temperature; The vacuum device (1) includes a base (11), a vibration table (12) mounted on the base (11), and a vacuum pump (17). The vacuum container (14) includes an installation cylinder (15) and a top cover (16). A support frame (3) is installed inside the installation cylinder (15). The support frame (3) includes a support plate (31) for supporting the specific gravity bottle and a clamping frame (5) for clamping the specific gravity bottle. A connecting block (8) is fixed on the bottom surface of the support plate (31). A connecting groove (81) for inserting the connecting block (8) is opened on the bottom surface of the installation cylinder (15). A positioning groove (83) is opened on the opposite inner side of the connecting groove (81). A positioning block (82) is installed on the installation cylinder (15) by sliding along its own radial direction through the positioning groove (83). A fixing groove (84) for inserting the positioning block (82) is opened on both sides of the connecting block (8). The top surface of the support plate (31) has several placement slots (32) for placing the specific gravity bottle. The clamping frame (5) includes a clamping plate (51) disposed above the support plate (31). The top surface of the clamping plate (51) has a movable through slot (52) for passing through the specific gravity bottle. The inner wall of the movable through slot (52) has a clamping ring groove (53). Several rotating blocks (56) and several clamping rods (54) are installed in the clamping ring groove (53). The clamping rods (54) are spaced apart circumferentially along the moving through groove (52), and the top surface of the clamping rods (54) is provided with a displacement groove (55). The rotating block (56) moves along the length direction of the clamping rods (54) through the displacement groove (55). The end of the clamping rods (54) can abut against the top of the specific gravity bottle. The clamping plate (51) is provided with a driving component for driving the clamping rods (54) to rotate into the moving through groove (52). The driving component includes a gear (57) rotatably mounted in the clamping ring groove (53). The gear (57) is fixedly connected to one end of the clamping rod (54) away from the moving through groove (52). The outer peripheral surface of the clamping plate (51) is provided with a connecting ring groove (58) that communicates with the clamping ring groove (53). A first internal gear (59) that meshes with the gear (57) is rotatably mounted in the connecting ring groove (58).

2. The method for determining fiber density in asphalt mixtures according to claim 1, characterized in that: The positioning block (82) has a reset groove (85) on its side. A reset block (86) passing through the reset groove (85) is fixed to the inner wall of the positioning groove (83). A spring (87) is fixed to the side of the reset block (86) away from the connecting groove (81). One end of the spring (87) away from the reset block (86) is fixedly connected to the inner wall of the reset groove (85). The bottom surface of the mounting cylinder (15) has an abutment groove (91) that communicates with the positioning groove (83). The mounting cylinder (15) passes through the... The abutment groove (91) is vertically slidably installed with an abutment block (9). A second spring (92) is fixed on the bottom surface of the abutment block (9). The bottom surface of the second spring (92) is fixedly connected to the inner bottom surface of the abutment groove (91). The side of the abutment block (9) is provided with an abutment through groove (93) for the positioning block (82) to pass through. The bottom surface of the abutment through groove (93) is provided with a first inclined surface (94). The side of the positioning block (82) away from the connecting groove (81) is provided with a second inclined surface (95) that can abut against the first inclined surface (94).

3. The method for determining fiber density in asphalt mixtures according to claim 2, characterized in that: The inner wall of the mounting cylinder (15) is provided with a dovetail groove (37). The mounting cylinder (15) is vertically slidably mounted with a dovetail block one (34) and a dovetail block two (96) through the dovetail groove (37). The bottom surface of the dovetail block one (34) can abut against the top surface of the dovetail block two (96). The dovetail block two (96) is fixedly connected to the side of the abutment block (9). A fixing rod (4) is fixed at the top of the dovetail groove (37). A spring-loaded spring (41) is wound around the outer periphery of the fixing rod (4). One end of the spring-loaded spring (41) is connected to the outer periphery of the fixing rod (4). The other end of the spring (41) is fixedly connected to the top surface of the dovetail block (34); the inner wall of the mounting cylinder (15) is provided with a limiting groove (42), and the mounting cylinder (15) is vertically slidably mounted with a float (43) through the limiting groove (42). The inner wall of the limiting groove (42) is provided with a connecting groove that communicates with the dovetail groove (37). A pull rope (46) is fixed to the bottom surface of the float (43), and the end of the pull rope (46) away from the float (43) passes through the connecting groove and is fixedly connected to the bottom surface of the dovetail block (34).

4. The method for determining fiber density of asphalt mixtures according to claim 3, characterized in that: Guide blocks (44) are fixed on both sides of the float (43), and guide grooves (45) are provided on the inner wall of the limiting groove (42). The guide blocks (44) slide vertically to the mounting cylinder (15) plate through the guide grooves (45).

5. The method for determining fiber density in asphalt mixtures according to claim 3, characterized in that: Both sides of the bearing plate (31) are fixed with bearing rods (33). The side of the dovetail block (34) near the bearing rod (33) is fixed with a bearing block (35). The side of the bearing block (35) near the bearing rod (33) is provided with a relief groove (36). The bearing rod (33) slides vertically to the bearing block (35) through the relief groove (36).

6. The method for determining fiber density in asphalt mixtures according to claim 1, characterized in that: The top surface of the first internal gear (59) is provided with a slot (61), and the top surface of the clamping plate (51) is provided with a fixed through slot (63). The clamping plate (51) slides vertically through the fixed through slot (63) and a block (6) that can be inserted into the slot (61) is installed. The side of the block (6) is provided with a sliding groove (62). The inner wall of the fixed through slot (63) is fixed with a slider (64) that passes through the sliding groove (62). The bottom surface of the slider (64) is fixed with a spring (65), and the bottom end of the spring (65) is fixedly connected to the bottom surface of the sliding groove (62).

7. The method for determining the fiber density of asphalt mixtures according to claim 1, characterized in that: The bottom surface of the clamping plate (51) is fixed with four adjusting screws (7). The top surface of the bearing plate (31) is provided with an adjusting through hole (71). A gear two (72) is rotatably installed in the adjusting through hole (71). The top surface of the gear two (72) is provided with an adjusting through groove (73) for passing through the adjusting screws (7). The inner circumferential surface of the adjusting through groove (73) is provided with threads. The adjusting screws (7) and the gear two (72) are threadedly driven together. The outer circumferential surface of the bearing plate (31) is provided with a receiving groove (74). A second internal gear (75) that meshes with the gear two (72) is rotatably installed in the receiving groove (74).

8. The method for determining fiber density of asphalt mixtures according to claim 7, characterized in that: A ratchet (76) is fixedly fitted on the outer circumferential surface of the second internal gear (75). A pawl (77) is rotatably mounted on the bottom surface of the receiving groove (74). The pawl (77) can be inserted into the tooth groove of the ratchet (76). A receiving block (78) is fixed on the bottom surface of the receiving groove (74). A spring four (79) is fixed on the side of the receiving block (78) near the pawl (77). The end of the spring four (79) away from the receiving block (78) is fixedly connected to the side of the pawl (77) away from the ratchet (76).

Images