A rotary film drying oven for high-viscosity and high-elastic asphalt

Abstract

The present invention relates to a rotary film oven for high-viscosity and high-elastic asphalt. In the rotary film oven, a fan is arranged on the top surface of the box body and faces the rotating disk; the fan is connected to the fan switch; a hot air duct is arranged on the bottom surface of the box body and faces the rotating disk; the hot air duct is respectively connected to the heating timing setting switch and the heating switch; electromagnetic suction cups are evenly arranged at the surrounding positions of the box body, and each electromagnetic suction cup faces the rotating disk; each electromagnetic suction cup is connected to the electromagnetic intensity adjustment switch; a strong magnetic metal rod is placed in a sample rotating bottle; a thermometer is arranged on the top surface of the box body and connected to the temperature liquid crystal adjustment switch; the electromagnetic intensity adjustment switch, the temperature liquid crystal adjustment switch, the heating timing setting switch, the heating switch and the fan switch are all connected to the power switch. The present invention improves the asphalt film forming effect.

Description

Technical Field

[0001] The invention relates to the field of asphalt processing devices, and in particular to a rotary film drying oven for high-viscosity and high-elasticity asphalt. Background Art

[0002] In the PG grading of asphalt, the rolling thin-film oven test (RTFOT) is used to simulate the short-term aging of asphalt during the construction process. The existing RTFOT experimental method is to prepare a standard asphalt sample according to the method of regulation T0602, and evenly pour the asphalt sample into a sample bottle with a height of 139.7mm±1.5mm, an outer diameter of 64mm±1.2mm, a wall thickness of 2.4mm±0.3mm, and a mouth diameter of 31.75mm±1.5mm. The asphalt in the bottle is 35g±0.5g. The sample bottle is placed in a rotating thin-film oven maintained at a constant temperature of 163℃±0.5℃, in which the ring frame on which the sample bottle is placed rotates at a speed of 15r / min±0.2r / min, and hot air with a flow rate of 4000mL / min±200mL / min is sprayed in at the same time for 85min. After the time is reached, the sample bottle is taken out, and after cooling, the mass loss and various indicators of other residues after aging are measured. The existing RTFOT test method simulates the short-term aging of asphalt during the construction process, which is reasonable for base asphalt, but there are problems with high-viscosity and high-elasticity modified asphalt. For the rotating thin film oven test of high-viscosity and high-elasticity asphalt, there is still no asphalt on the bottle mouth after rotation, which means that at the test temperature of 163°C, the modified asphalt has a high viscosity and cannot form a uniform film in the bottle, or the modified asphalt thin layer in the rotating bottle does not flow, and it is impossible to simulate the effect of asphalt being affected by hot air in a continuously flowing thin film state. Therefore, the original RTFOT cannot truly simulate the short-term aging of modified asphalt during the actual mixing process.

[0003] Based on the above problems, some technicians have proposed the following improved methods:

[0004] (1) The RTFOT was improved by adding steel rods. The results showed that the effect of adding steel rods to form a new surface of the asphalt film was not obvious. It was difficult for the steel rods to make the asphalt form a uniform flowing film under the action of gravity alone.

[0005] (2) The fluidity of modified asphalt can be improved by increasing the test temperature, but simply increasing the temperature cannot truly reflect the short-term aging scenario. Changing the temperature is not conducive to the comparison of experimental data when testing different materials. Moreover, if the test temperature is too high, the risk factor of the test will increase.

[0006] Therefore, there is an urgent need for a rotary film drying oven for high-viscosity and high-elastic asphalt to solve the technical problem that high-viscosity and high-elastic asphalt cannot form a uniform asphalt film in a sample rotating bottle. Summary of the invention

[0007] The purpose of the present invention is to provide a rotary film drying oven for high-viscosity and high-elasticity asphalt to improve the asphalt film forming effect.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] A rotary film drying oven for high-viscosity and high-elastic asphalt, comprising a box body, a rotating disk is arranged in the box body, the rotating disk is connected to the rotating switch, and the rotating switch is connected to the power switch; a sample port is provided on the rotating disk, and the sample port is used to place a rotating bottle for sample; the rotary film drying oven also includes: a fan, a fan switch, a hot air duct, a heating timing setting switch, a heating switch, four electromagnetic suction cups, a strong magnetic metal rod, an electromagnetic intensity adjustment switch, a thermometer and a temperature liquid crystal adjustment switch;

[0010] The fan is arranged on the top surface of the box body and faces the rotating disk;

[0011] The fan is connected to the fan switch;

[0012] The hot air duct is arranged on the bottom surface of the box body and faces the rotating disk; the hot air duct is respectively connected to the heating timing setting switch and the heating switch;

[0013] The electromagnetic suction cups are evenly arranged at the four sides of the box, and each of the electromagnetic suction cups is directly facing the rotating disk; each of the electromagnetic suction cups is connected to the electromagnetic intensity adjustment switch;

[0014] The strong magnetic metal rod is placed in the sample rotating bottle;

[0015] The thermometer is arranged on the top surface of the box body and is connected to the temperature liquid crystal adjustment switch;

[0016] The electromagnetic intensity adjustment switch, the temperature liquid crystal adjustment switch, the heating timing setting switch, the heating switch and the fan switch are all connected to the power switch.

[0017] Optionally, the height of the ferromagnetic metal rod is lower than the height of the sample rotating bottle.

[0018] Optionally, the rotating disk is made of ceramic or copper-aluminum alloy.

[0019] Optionally, it also includes: hot air circulation holes;

[0020] The hot air circulation holes are arranged on the inner wall of the box body and are communicated with the hot air duct to form air circulation.

[0021] Optionally, it also includes: an air flow sensor and an air flow meter;

[0022] The air flow sensor is arranged on the top surface of the box body and is connected to the air flow meter.

[0023] Optionally, it also includes: an exhaust hole;

[0024] The exhaust hole is arranged on the top of the box body.

[0025] Optionally, it also includes: a fan motor;

[0026] The fan motor is connected to the fan and the fan switch respectively.

[0027] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0028] The present invention provides a rotary film oven for high-viscosity and high-elastic asphalt. An electromagnetic suction cup is added to the original rotary film oven. The electromagnetic induction principle technology is used to form a force on the strong magnetic metal rod in the sample rotating bottle, thereby helping to form an asphalt film from the inside, thereby solving the technical problem that high-viscosity and high-elastic asphalt cannot form a uniform asphalt film in the sample rotating bottle. The electromagnetic intensity adjustment switch is used to adjust the size of the force formed, thereby better adapting to the experimental needs and further improving the asphalt film formation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 creative labor.

[0030] Figure 1 This is a schematic diagram of the structure of a rotary thin film oven for high-viscosity and high-elastic asphalt provided by the present invention;

[0031] Figure 2 This is a simple circuit diagram of an adjustable electromagnet. DETAILED DESCRIPTION

[0032] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0033] The purpose of the present invention is to provide a rotary film drying oven for high-viscosity and high-elasticity asphalt to improve the asphalt film forming effect.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Figure 1 The schematic diagram of the structure of a rotary film oven for high-viscosity and high-elastic asphalt provided by the present invention is as follows: Figure 1 As shown, a rotary film drying oven for high-viscosity and high-elastic asphalt provided by the present invention comprises a box body 1, a rotating disk 3 is arranged in the box body 1, the rotating disk 3 is connected to the rotating switch 20, and the rotating switch 20 is connected to the power switch 17; a sample port is provided on the rotating disk 3, and the sample port is used to place a sample rotating bottle 11; the rotary film drying oven also includes: a fan 6, a fan switch 18, a hot air duct 9, a heating timing setting switch 16, a heating switch 19, four electromagnetic suction cups 8, a strong magnetic metal rod 12, an electromagnetic intensity adjustment switch 14, a thermometer 2 and a temperature liquid crystal adjustment switch 15.

[0036] The fan 6 is disposed on the top surface of the housing 1 and faces the rotating disk 3 .

[0037] The fan 6 is connected to the fan switch 18 .

[0038] The hot air duct 9 is arranged on the bottom surface of the box body 1 and faces the rotating disk 3; the hot air duct 9 is connected to the heating timing setting switch 16 and the heating switch 19 respectively.

[0039] The electromagnetic suction cups 8 are evenly arranged at the four sides of the box body 1 , and each of the electromagnetic suction cups 8 faces the rotating disk 3 ; each of the electromagnetic suction cups 8 is connected to the electromagnetic intensity adjustment switch 14 .

[0040] The strong magnetic metal rod 12 is placed in the sample rotating bottle 11 .

[0041] The thermometer 2 is arranged on the top surface of the box body 1 and is connected to the temperature liquid crystal adjustment switch 15 .

[0042] The electromagnetic intensity adjustment switch 14 , the temperature liquid crystal adjustment switch 15 , the heating timing setting switch 16 , the heating switch 19 and the fan switch 18 are all connected to the power switch 17 .

[0043] The experimental process is basically the same as the conventional RTFOT, the difference is that before starting the rotation, the electromagnetic suction cup 8 switch is turned on, the power is turned on to obtain magnetism, and then the rotation is started. After the rotation is completed, the electromagnetic switch is turned off, and then the oven door is opened to take out the test piece. During the rotation process, the measuring bottle is close to the electromagnetic suction cup 8 in different directions at different degrees. Each electromagnetic suction cup 8 will generate magnetic forces of different angles on the metal rod in the bottle, so that the metal rod can rotate in the bottle, and the asphalt in the measuring bottle is more fully rolled, which is conducive to the formation of asphalt film. When the electromagnetic suction cup 8 is not turned on, it does not affect the short-term aging test of conventional matrix asphalt, and the electromagnetic intensity can also be adjusted.

[0044] like Figure 1 As shown, four electromagnetic chucks 8 are added around the inside of the oven. The electromagnetic chuck 8 is a common machine tool accessory product that uses the electromagnetic principle to generate magnetic force by energizing the internal coil, and through the magnetic conductive panel, the workpiece in contact with the panel surface is tightly sucked. When the coil is powered off, the magnetic force disappears to achieve demagnetization and remove the workpiece. The schematic diagram of the adjustable electromagnet simple circuit is shown in Figure 2 shown.

[0045] In the working state, the electromagnetic suction cup 8 is energized to generate magnetic force. The magnetic force attracts the metal rod. During the continuous rotation of the rotating disk 3, the metal rods independently existing in each rotating bottle are also moving, and approaching the electromagnetic suction cups 8 in different directions in turn. Under the influence of gravity, the metal rods roll back and forth in the rotating sample bottle, and pressure is generated in the surface tangent to the inner surface of the rotating sample bottle, which can crush the high-viscosity and high-elastic asphalt, and promote the asphalt to form a uniform film in the sample bottle.

[0046] The four electromagnetic suction cups 8 are centrally symmetrical, and the rotating disk 3 rotates at a speed of 15r / min for 85min. The steel rod rotates continuously in the sample bottle, and the asphalt can be fully crushed at all angles. In the current existing experiments, no steel rod is placed in the sample bottle, and only the centrifugal force is used to form a thin film of asphalt on the inner surface of the bottle. In comparison, the experimental method of the present invention can ensure that the asphalt film is more uniform and meets the standard requirements and experimental needs.

[0047] The height of the ferromagnetic metal rod 12 is lower than the height of the sample rotating bottle 11 .

[0048] As a specific embodiment, the height of the sample rotating bottle 11 is 139.7 mm±1.5 mm, and the height of the ferromagnetic metal rod 12 is preferably about 138 mm.

[0049] In order to avoid the influence, the rotating disk 3 should be made of weak magnetic material, and the strength should not be significantly reduced at the experimental temperature. The material of the rotating disk 3 is ceramic or copper-aluminum alloy.

[0050] The rotary film oven for high-viscosity and high-elasticity asphalt provided by the present invention further includes: hot air circulation holes 10.

[0051] The hot air circulation holes 10 are provided on the inner wall of the box body 1 and communicate with the hot air duct 9 to form air circulation.

[0052] The rotary film drying oven for high-viscosity and high-elasticity asphalt provided by the present invention further includes: an air flow sensor 7 and an air flow meter 13 .

[0053] The air flow sensor 7 is arranged on the top surface of the box body 1 and is connected to the air flow meter 13 .

[0054] The rotary film oven for high-viscosity and high-elastic asphalt provided by the present invention further includes: an exhaust hole 4;

[0055] The exhaust hole 4 is arranged on the top of the box body 1 .

[0056] The rotary film drying oven for high-viscosity and high-elasticity asphalt provided by the present invention also includes: a fan motor 5.

[0057] The fan motor 5 is connected to the fan 6 and the fan switch 18 respectively.

[0058] The operating procedures of a rotary film oven for high-viscosity and high-elastic asphalt provided by the present invention are as follows:

[0059] Prepare standard asphalt samples according to the method of regulation T0602, and pour the asphalt samples evenly into a sample rotating bottle 11 with a height of 139.7mm±1.5mm, an outer diameter of 64mm±1.2mm, a wall thickness of 2.4mm±0.3mm, and a mouth diameter of 31.75mm±1.5mm. The asphalt in the sample rotating bottle 11 is 35g±0.5g, and a strong magnetic metal rod 12 with a height of 138mm and a diameter of 10mm is placed in the sample rotating bottle 11. Open the hatch of the oven, and place the sample rotating bottle 11 in a rotary film oven maintained at a constant temperature of 163℃±0.5℃. Close the door, turn on the fan switch 18; turn on the heating switch 19; adjust the electromagnetic intensity adjustment switch 14 according to the viscosity of the asphalt sample; then turn on the rotation switch 20, let the rotating disk 3 with the sample rotating bottle 11 rotate at a speed of 15r / min±0.2r / min, adjust the air flow meter 13, spray hot air with a flow rate of 4000mL / min±200mL / min from the hot air duct 9, set the heating timing setting switch 16, and keep it for 85min. It is necessary to ensure that the temperature in the box 1 rises to 163℃±0.5℃ within 10min, and observe the temperature LCD adjustment switch 15 or the thermometer 2. If it cannot be reached, the experiment cannot continue. After the time is reached, take out the sample rotating bottle 11, and after cooling, measure the mass loss and various indicators of other residues after aging.

[0060] The strong magnetic metal rod 12 of the present invention can better make the asphalt form a uniform flowing film under the action of magnetic force. The experimental temperature is still 163℃±0.5℃, which can well reflect the short-term aging scene. It is conducive to the comparison of experimental data when testing different materials. And it will not increase the risk factor of the experiment.

[0061] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0062] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A rotary film oven for high-viscosity and high-elastic asphalt, comprising a box body and a rotary switch; a rotary disk is arranged in the box body, the rotary disk is connected to the rotary switch, and the rotary switch is connected to a power switch; The rotating disk is provided with a sample port, and the sample port is used to place a sample rotating bottle; the characteristic is that: The rotary film oven also includes: a fan, a blower switch, a hot air duct, a heating timing setting switch, a heating switch, four electromagnetic suction cups, a strong magnetic metal rod, an electromagnetic intensity adjustment switch, a thermometer and a temperature liquid crystal adjustment switch; The fan is arranged on the top surface of the box body and faces the rotating disk; The fan is connected to the fan switch; The hot air duct is arranged on the bottom surface of the box body and faces the rotating disk; The electromagnetic suction cups are evenly arranged at the four sides of the box, and each of the electromagnetic suction cups is directly facing the rotating disk; each of the electromagnetic suction cups is connected to the electromagnetic intensity adjustment switch; The strong magnetic metal rod is placed in the sample rotating bottle; The thermometer is arranged on the top surface of the box body and is connected to the temperature liquid crystal adjustment switch; The electromagnetic intensity adjustment switch, the temperature liquid crystal adjustment switch, the heating timing setting switch, the heating switch and the fan switch are all connected to the power switch; The height of the strong magnetic metal rod is lower than the height of the sample rotating bottle; The different degrees of proximity between the rotating bottle and the electromagnetic suction cups in different directions during the rotation process of the sample rotating bottle are used, and each electromagnetic suction cup generates magnetic forces of different angles on the metal rod in the rotating bottle, so that the metal rod rotates in the rotating bottle and the asphalt in the rotating bottle is fully crushed; The rotary film oven further comprises: hot air circulation holes; The hot air circulation holes are arranged on the inner wall of the box body and are communicated with the hot air duct to form air circulation.

2. A rotary film drying oven for high-viscosity and high-elastic asphalt according to claim 1, characterized in that: The material of the rotating disk is ceramic or copper-aluminum alloy.

3. The rotary film drying oven for high-viscosity and high-elastic asphalt according to claim 1, characterized in that: Also includes: Air flow sensor and air flow meter; The air flow sensor is arranged on the top surface of the box body and is connected to the air flow meter.

4. The rotary film drying oven for high-viscosity and high-elastic asphalt according to claim 1, characterized in that: Also includes: Exhaust holes; The exhaust hole is arranged on the top of the box body.

5. The rotary film drying oven for high-viscosity and high-elastic asphalt according to claim 1, characterized in that: Also includes: Fan motor; The fan motor is connected to the fan and the fan switch respectively.

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