Asphalt mixture scattering detection device capable of controlling friction force

Abstract

The asphalt mixture scattering detection device capable of controlling the friction force comprises a base, a first supporting rod and a second supporting rod are fixedly arranged on the base, a round rod is arranged between the first supporting rod and the second supporting rod, and the two ends of the round rod are rotationally connected with the first supporting rod and the second supporting rod respectively; the first supporting rod and the second supporting rod are both parallel to the upper surface of the base. A conveying belt is arranged below the round rod; the upper surface of the base is rotationally connected with a first transmission rod and a second transmission rod, and the inner sides of the two ends of the conveying belt are in transmission connection with the first transmission rod and the second transmission rod correspondingly. The round rod is fixed to one end of a thin rope, and the other end of the thin rope is fixedly connected with a connecting disc. And the connecting disc is fixedly connected with an asphalt mixture test piece. According to the utility model, the problems that a test piece is easily damaged and the friction force on the test piece is uncontrollable when the anti-scattering performance of the asphalt mixture is tested by the Laus abrasion tester through impact are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of road engineering and relates to an asphalt mixture scattering detection device capable of controlling friction. Background Art

[0002] In terms of asphalt mixture scattering detection, through scientific detection methods and standards, the particle scattering problem of drainage asphalt pavement during use can be evaluated and controlled, further improving the durability and service life of the pavement.

[0003] At present, the main testing standard for the anti-scattering performance of asphalt mixtures is the Los Angeles abrader test specification. During the test, a Marshall specimen is placed in a metal cylinder and repeatedly impacted to produce mass loss. The anti-scattering performance of the asphalt mixture is evaluated by the mass difference before and after the test. During the test, it is impossible to determine whether the mass loss is caused by damage to the specimen due to impact or by wear. At the same time, the friction force on the specimen during the test is uncontrollable, resulting in large differences in test results. Summary of the Invention

[0004] In order to achieve the above-mentioned purpose, the utility model provides an asphalt mixture scattering detection device with controllable friction force, which solves the problem that the Los Angeles abrasion tester tests the anti-scattering performance of asphalt mixture through impact, which easily causes damage to the test piece and the friction force on the test piece is uncontrollable.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is a friction-controllable asphalt mixture scattering detection device, comprising a base, a first support rod and a second support rod are fixed on the base, a round rod is provided between the first support rod and the second support rod, and the two ends of the round rod are rotatably connected to the first support rod and the second support rod respectively; the first support rod and the second support rod are both parallel to the upper surface of the base; a conveyor belt is provided under the round rod; the upper surface of the base is rotatably connected with the first transmission rod and the second transmission rod, and the inner sides of the two ends of the conveyor belt are respectively transmission-connected to the first transmission rod and the second transmission rod; the round rod is fixed to one end of the thin rope, and the other end of the thin rope is fixedly connected to the connecting disk; the connecting disk is fixedly connected to the asphalt mixture specimen; the second transmission rod is fixedly connected to the output end of the first motor, and the first motor is fixed on the base; the first motor is electrically connected to the current controller.

[0006] Furthermore, the first transmission rod is fixedly connected to the output end of the second motor, and the second motor is electrically connected to the current controller.

[0007] Furthermore, one end of the first transmission rod away from the second motor and one end of the second transmission rod away from the first motor are respectively connected to the rolling support, and the lower side of the rolling support is fixed on the base through a rolling base.

[0008] Furthermore, the conveyor belt includes a wear layer, an adhesive layer, and a chain, wherein the adhesive layer is located between the wear layer and the chain; gears are fixedly sleeved on the first transmission rod and the second transmission rod respectively; the gears are connected by chain transmission, and the chain is engaged with the gears.

[0009] Furthermore, the chain includes a first chain and a second chain; two gears are fixedly mounted on the first transmission rod and the second transmission rod; the first chain is respectively engaged with the corresponding gears on the first transmission rod and the second transmission rod; the second chain is respectively engaged with the corresponding gears on the first transmission rod and the second transmission rod.

[0010] Furthermore, the wear layer is a rubber belt with patterns.

[0011] Furthermore, the connecting disk includes a metal inner ring and a metal outer ring, and the metal inner ring and the metal outer ring are rotatably connected by steel balls; a metal disc is fixedly sleeved on the outside of the metal outer ring; the end of the thin rope away from the round rod is fixedly connected to the metal inner ring; and the metal disc is fixedly connected to the asphalt mixture specimen.

[0012] Furthermore, a rotation speed sensor is provided between the conveyor belt and the second support rod.

[0013] Furthermore, the model of the rotation speed sensor is ESH31850.

[0014] Furthermore, one end of the round rod is fixedly connected to the rotating handle.

[0015] The beneficial effects of the utility model are:

[0016] 1. The utility model adjusts the rotational speed of the first motor and the second motor through a current controller to achieve synchronous operation of the two motors, thereby driving the conveyor belt to rotate at a uniform speed; at the same time, the round rod is connected to the connecting disk by a thin rope, and the asphalt mixture specimen is fixed between the two connecting disks to achieve the rotation of the asphalt mixture specimen; friction is then generated by the rotating conveyor belt and the rotating asphalt mixture specimen to conduct the test; finally, by comparing the total weight of the connecting disk and the asphalt mixture specimen before and after the test, the mass loss rate is calculated to complete the experiment.

[0017] 2. In the present invention, it is only necessary to determine the acceleration torque of the conveyor belt during no-load and experiment and the electromagnetic torque of the motor rotor to determine the magnitude of the friction force on the asphalt mixture; the asphalt mixture scattering test with different friction forces can be achieved by changing the size of the Marshall specimen and replacing the wear layer with different friction coefficients.

[0018] 3. The utility model fixes the asphalt mixture specimen on two connecting plates for testing, thereby avoiding damage to the specimen caused by impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of an asphalt mixture scattering detection device in an embodiment of the present utility model.

[0021] Figure 2 It is a schematic diagram of the transmission rod gear structure in an embodiment of the present utility model.

[0022] Figure 3 It is a cross-sectional view of the conveyor belt structure in the embodiment of the present utility model.

[0023] Figure 4 It is a front view of the connecting disk in the embodiment of the present utility model.

[0024] Figure 5 It is a side view of the connecting disk in the embodiment of the present utility model.

[0025] In the figure, 1. Base, 2. First support rod, 3. Second support rod, 4. Round rod, 5. First motor, 6. Second motor, 7. Connecting disk, 8. String, 9. Conveyor belt, 10. Second transmission rod, 11. Rolling support, 12. Rolling base, 13. First transmission rod, 14. Gear, 18. First chain, 19. Second chain, 20. Wear layer, 21. Adhesive layer, 22. Chain, 23. Metal outer ring, 24. Steel ball, 25. Metal inner ring, 26. Metal disc, 27. Current controller, 28. Speed ​​sensor, 29. Rotating handle. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] like Figures 1 to 4 As shown, the present invention provides an asphalt mixture scattering detection device capable of controlling friction, comprising a base 1, a power supply control structure and a test main body structure.

[0028] The power supply control structure includes a first motor 5, a second motor 6, and a current controller 27. The current controller 27 is connected in series with the first motor 5 and the second motor 6, respectively. The current controller 27 is used to control the current of the first motor 5 and the second motor 6, thereby controlling the speed of the first motor 5 and the second motor 6. The current controller 27 specifically adopts a WYG programmable DC regulated power supply.

[0029] The main structure of the test consists of the following: a first support rod 2 and a second support rod 3 are mounted on a base 1 and fixedly connected to the base 1; a round rod 4 is placed horizontally above the conveyor belt 9, with its ends rotatably connected to the first support rod 2 and the second support rod 3, respectively. The output ends of the first motor 5 and the second motor 6 are fixedly connected to the second transmission rod 10 and the first transmission rod 13, respectively. The other ends of the first transmission rod 13 and the second transmission rod 10 are connected to a rolling support 11, which is fixed to the base 1 via a rolling base 12. The conveyor belt 9 is mounted on the first transmission rod 13 and the second transmission rod 10, and a thin rope 8 is connected to a connecting plate 7 at one end and tied to the round rod 4 at the other end. The connecting plate 7 is glued to both sides of the Marshall specimen to ensure that the Marshall specimen (i.e., the asphalt mixture specimen, hereinafter referred to as the Marshall specimen) can roll freely on the conveyor belt 9 during the test. In addition, using two motors to synchronously drive the conveyor belt 9 can significantly reduce the internal friction of the conveyor belt 9 during rotation, compared to using a single motor to drive the conveyor belt 9.

[0030] In some embodiments, two gears 14 are fixedly mounted on the first transmission rod 13 and the second transmission rod 10. The schematic diagram of the gears 14 is as shown in FIG. Figure 2 As shown; conveyor belt 9 as Figure 3 As shown, the conveyor belt 9 comprises a wear layer 20, an adhesive layer 21, and a chain 22. The wear layer 20 is provided as the outermost layer and is a patterned rubber belt. The chain 22 is provided on the innermost side of the conveyor belt 9 and is meshed with the gear 14. The adhesive layer 21 is provided between the wear layer 20 and the chain 22. The adhesive layer 21 fixes the chain 22 and the wear layer 20 together, and the gear 14 drives the chain 22 and the wear layer 20 to rotate.

[0031] In some embodiments, a rotation speed sensor 28 is provided between the conveyor belt 9 and the second support rod 3 to measure the rotation speed of the conveyor belt 9. The specific model of the rotation speed sensor 28 is ESH31850.

[0032] In some embodiments, the chain 22 includes a first chain 18 and a second chain 19 , and the first chain 18 and the second chain 19 are respectively engaged with corresponding gears 14 .

[0033] In some embodiments, one end of the round rod 4 is fixedly connected to the rotating handle 29 , and the round rod 4 can be driven to rotate by rotating the rotating handle 29 , thereby tightening and loosening the thin rope 8 on the round rod 4 .

[0034] In some embodiments, the connection plate 7 is as follows Figure 4 、 Figure 5 As shown, the Marshall test piece consists of a metal outer ring 23, steel balls 24, a metal inner ring 25, and a metal disc 26. The end of the string 8, away from the round rod 4, is fixedly connected to the metal inner ring 25. The inner ring 25 and the outer ring 23 are rotationally connected via the steel balls 24, similar to the principle of a bearing. The metal disc 26 is fixedly connected to the outer ring 23, and the other end of the metal disc 26 is glued to the Marshall test piece. When the conveyor belt 9 rotates, the Marshall test piece rotates with the metal disc 26 due to friction. However, the metal inner ring 25, due to its rotational connection with the metal disc 26, does not rotate due to the tension of the string 8, thus achieving scattering detection of the Marshall test piece.

[0035] The working process of this utility model is:

[0036] First, remove the thin rope 8 from the round rod 4, take a Marshall specimen, glue the metal discs 26 of the two connecting plates 7 to both sides of the Marshall specimen with glue, weigh the total weight of the connecting plates 7 and the specimen at this time, and record it as the first total weight; leave a sufficiently long length for the two thin ropes 8, tie the two thin ropes 8 at the same length and then tie the other ends together to the same place on the round rod 4, and place the Marshall specimen with the connecting plates 7 glued upright on the conveyor belt 9 to complete the specimen preparation.

[0037] Turn on the power supply, turn on the speed sensor 28 to read the speed of the conveyor belt 9, operate the current controller 27, increase the current, and the first motor 5 and the second motor 6 rotate synchronously. At this time, the Marshall specimen rolls under the drive of the conveyor belt 9. Adjust the current controller 27 and observe the speed sensor 28. When the speed of the conveyor belt 9 is uniform, the magnitude of the friction force on the Marshall specimen can be calculated.

[0038] Specifically, when rotating at a constant speed, the conveyor belt 9 is powered by the electromagnetic torque of the rotors of the first and second motors 5 and 6 (the electromagnetic torque of the rotor is equal to the electromagnetic torque of the stator minus the frictional resistance torque; the electromagnetic torque of the stator can be calculated from the current). The conveyor belt 9 is also affected by various frictional forces and torques, such as the friction of the first and second transmission rods 13 and 10 (e.g., the friction between the transmission rods and the rolling bearings 11), and the friction at the junction of the Marshall specimen and the wear layer 20. These various frictional forces and torques can be calculated by calculating the difference between the electromagnetic torque generated by the current when the conveyor belt 9 reaches the same speed when unloaded and the acceleration torque generated by the conveyor belt 9. The electromagnetic torque exerted on the rotor is transmitted through the rotor to the corresponding transmission rod, which then transmits it to the conveyor belt 9. Therefore, the acceleration torque of the conveyor belt 9 is essentially the result of the electromagnetic torque after various frictional torque losses. Therefore, the friction force exerted on the Marshall specimen at this time can be calculated by subtracting the acceleration torque of the conveyor belt 9 from the electromagnetic torque of the rotor, and then subtracting the various frictional forces and torques.

[0039] Asphalt mixture scattering tests with different friction forces can be achieved by changing the size of the Marshall specimen and replacing the wearing layer 20 with different friction coefficients.

[0040] After the test, turn the rotary handle 29 to tighten the string 8, suspend the connecting disk 7 and the Marshall specimen in the air, turn off the conveyor belt 9, and remove the string 8 after the Marshall specimen stops rotating. Weigh the total weight of the connecting disk 7 and the Marshall specimen at this time, record it as the second total weight, and calculate the mass loss rate through the first total weight and the second total weight to complete the test.

[0041] Each embodiment in this specification is described in a related manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. An asphalt mixture scattering detection device capable of controlling friction, comprising a base (1), characterized in that: A first support rod (2) and a second support rod (3) are fixedly provided on the base (1); a round rod (4) is provided between the first support rod (2) and the second support rod (3); the two ends of the round rod (4) are rotatably connected to the first support rod (2) and the second support rod (3); the first support rod (2) and the second support rod (3) are parallel to the upper surface of the base (1); a conveyor belt (9) is provided below the round rod (4); a first transmission rod (13) and a second transmission rod (10) are rotatably connected to the upper surface of the base (1); the inner sides of the two ends of the conveyor belt (9) are respectively transmission-connected to the first transmission rod (13) and the second transmission rod (10); the round rod (4) is fixed to one end of a thin rope (8), and the other end of the thin rope (8) is fixedly connected to a connecting disk (7); the connecting disk (7) is fixedly connected to an asphalt mixture specimen; the second transmission rod (10) is fixedly connected to the output end of a first motor (5), and the first motor (5) is fixed to the base (1); the first motor (5) is electrically connected to a current controller (27).

2. The asphalt mixture scattering detection device capable of controlling friction according to claim 1, characterized in that: The first transmission rod (13) is fixedly connected to the output end of the second motor (6), and the second motor (6) is electrically connected to the current controller (27).

3. The asphalt mixture scattering detection device capable of controlling friction according to claim 1, characterized in that: One end of the first transmission rod (13) away from the second motor (6) and one end of the second transmission rod (10) away from the first motor (5) are respectively connected to the rolling support (11), and the lower part of the rolling support (11) is fixed to the base (1) via a rolling base (12).

4. The asphalt mixture scattering detection device capable of controlling friction according to claim 1, characterized in that: The conveyor belt (9) comprises a wear layer (20), an adhesive layer (21), and a chain (22), wherein the adhesive layer (21) is located between the wear layer (20) and the chain (22); gears (14) are fixedly sleeved on the first transmission rod (13) and the second transmission rod (10), respectively; the gears (14) are connected to each other through the chain (22), and the chain (22) is meshed with the gears (14).

5. The asphalt mixture scattering detection device capable of controlling friction according to claim 4, characterized in that: The chain (22) includes a first chain (18) and a second chain (19); two gears (14) are fixedly sleeved on the first transmission rod (13) and the second transmission rod (10); the first chain (18) is respectively engaged with the corresponding gears (14) on the first transmission rod (13) and the second transmission rod (10); and the second chain (19) is respectively engaged with the corresponding gears (14) on the first transmission rod (13) and the second transmission rod (10).

6. The asphalt mixture scattering detection device capable of controlling friction according to claim 4, characterized in that: The wear layer (20) is a rubber belt with patterns.

7. The asphalt mixture scattering detection device capable of controlling friction according to claim 1, characterized in that: The connecting disk (7) comprises a metal inner ring (25) and a metal outer ring (23), wherein the metal inner ring (25) and the metal outer ring (23) are rotatably connected via a steel ball (24); a metal disc (26) is fixedly sleeved on the outer side of the metal outer ring (23); an end of the thin rope (8) away from the round rod (4) is fixedly connected to the metal inner ring (25); and the metal disc (26) is fixedly connected to the asphalt mixture specimen.

8. The asphalt mixture scattering detection device capable of controlling friction according to claim 1, characterized in that: A rotation speed sensor (28) is provided between the conveyor belt (9) and the second support rod (3).

9. The asphalt mixture scattering detection device capable of controlling friction according to claim 8, characterized in that: The model of the rotation speed sensor (28) is ESH31850.

10. The asphalt mixture scattering detection device capable of controlling friction according to claim 1, characterized in that: One end of the round rod (4) is fixedly connected to the rotating handle (29).

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