A composite force field emulsified asphalt and water mixing stability experimental device and test method

Abstract

The invention discloses a composite force field emulsified asphalt and water mixing stability experimental device and test method, the experimental device comprises a mixing drum, a hollow main mixing shaft is installed inside the mixing drum, a plurality of staggered H-shaped mixing paddles and I-shaped mixing rods are arranged on the main mixing shaft, a mixing blade with holes is arranged between the H-shaped mixing paddles and the I-shaped mixing rod, the upper end of the main mixing shaft extends out of the top of the mixing drum and is connected to the output shaft of the ring-shaped motor; the water inlet is located in the middle of the ring-shaped motor, water vapor enters the main mixing shaft through the water inlet under the action of pump pressure and is ejected from the drainage hole at the bottom of the mixing blade with holes; the first observation chamber and the second observation chamber are separated from each other and are both arranged below the mixing drum; the control valve is used to control the mixture flowing out of the mixing drum to enter the first observation chamber or the second observation chamber. The invention makes water and emulsified asphalt fully mixed, has good uniformity, high mixing efficiency, strong repeatability of the test, and reduces the influence of human operation.

Description

Technical Field

[0001] The invention belongs to the technical field of asphalt, and relates to a composite force field emulsified asphalt and water mixing stability experimental device and a testing method. Background Art

[0002] According to the experimental device and usage method designed for the test of emulsified asphalt and water mixing stability in T 0665-2011 of JTG E20-2011 Highway Engineering Asphalt and Asphalt Mixture Test Procedure, for some emulsified asphalts, especially spraying emulsified asphalt, in order to ensure smooth and uniform spreading, the emulsified asphalt with a high residue content needs to be diluted with water before construction. At this time, if it is not inspected in advance, it is possible that the emulsified asphalt will break when diluted with water. In order to ensure the construction quality, it is necessary to evaluate the water dilution stability of emulsified asphalt. The amount of emulsified asphalt used in the test is relatively small, and there is no special stirring device to stir the emulsified asphalt. It can only be stirred manually by the test personnel. Due to the high viscosity of emulsified asphalt, the test personnel are more laborious when stirring manually, and the stirring effect is poor, which affects the experimental results. In addition, the existing experimental methods have complicated operation steps, are greatly affected by human operation factors, and the test results are highly subjective, and can only be qualitatively analyzed.

[0003] At present, the main method is the stability test of emulsified asphalt and water mixture in the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011) T0665-2011. The disadvantage of this method is that the test results are highly subjective and can only be analyzed qualitatively. The disadvantage of the mixing test given in the "Technical Guide for Micro-surfacing and Slurry Seal" is also the subjectivity of the test. The test results may vary greatly when operated by different personnel, and the repeatability and reproducibility of the test are poor. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a composite force field emulsified asphalt and water mixing stability experimental device, so that water and emulsified asphalt can be fully mixed with good uniformity and high mixing efficiency. The test repeatability is strong, the influence of human operation is reduced, and the problems of large subjectivity and large error in the test existing in the prior art are solved.

[0005] Another object of the present invention is to provide a method for testing the mixing stability of composite force field emulsified asphalt and water.

[0006] The technical solution adopted by the present invention is a composite force field emulsified asphalt and water mixing stability test device, comprising

[0007] A mixing drum, wherein a hollow main mixing shaft is installed inside the mixing drum, and a plurality of H-shaped mixing paddles and I-shaped mixing rods are arranged on the main mixing shaft, and a mixing blade with holes is arranged between the H-shaped mixing paddles and the I-shaped mixing rod, and the I-shaped mixing rod is located below the mixing blade with holes; the upper end of the main mixing shaft extends out of the top of the mixing drum and is connected to the output shaft of the ring motor, and the ring motor controls the hollow main mixing shaft to drive the H-shaped mixing paddles, the mixing blades with holes, and the I-shaped mixing rod to rotate simultaneously;

[0008] A water inlet, the water inlet is located in the middle of the ring-shaped motor, and water vapor enters the main stirring shaft through the water inlet under the action of pump pressure and is ejected from the drainage hole at the bottom of the perforated stirring blade;

[0009] An emulsified asphalt feed hopper, wherein the emulsified asphalt feed hopper is arranged on the top of the mixing drum;

[0010] A first observation chamber and a second observation chamber, wherein the first observation chamber and the second observation chamber are separated from each other and are both arranged below the mixing drum;

[0011] The control valve is used to control the mixed material flowing out of the mixing drum to enter the first observation chamber or the second observation chamber.

[0012] Furthermore, a spiral stirring paddle is provided below the I-shaped stirring rod at the bottom, and the upper port of the spiral stirring paddle is larger than the lower port and is conical; a plurality of radial stirring paddles with a U-shaped longitudinal section are provided below the spiral stirring paddle, and the rotating shaft of each radial stirring paddle is horizontally arranged and arranged along the radial direction of the stirring drum; the diameter of the upper port of the spiral stirring paddle is the same as the diameter of the H-shaped stirring paddle, and the diameter of the lower port of the spiral stirring paddle is not less than the radial spacing between the two opposite radial stirring paddles.

[0013] Furthermore, a circular placement plate is provided at the bottom center of the mixing drum, and the periphery of the placement plate is fixedly connected to the inner wall of the mixing drum through radially arranged transverse plates, and there are gaps between adjacent transverse plates to facilitate the falling of the mixture; the magnetic stirring rotor is placed on the placement plate, and the diameter of the placement plate is the same as the diameter of the lower port of the spiral stirring paddle; the top and bottom side walls of the mixing drum are respectively provided with a first electromagnetic coil and a second electromagnetic coil, and the first electromagnetic coil and the second electromagnetic coil are connected to a three-phase motor, and alternating current with a difference of 120° is introduced through the three-phase motor to drive the magnetic stirring rotor to rotate and drive the liquid to generate a rotating vortex, and the rotation direction of the main stirring shaft is opposite to the rotation direction of the magnetic stirring rotor, and together they form a composite force field.

[0014] Furthermore, two mechanical plug-in pieces are provided inside the control valve, one mechanical plug-in piece is used to connect or disconnect the mixing drum and the first observation chamber, and the other mechanical plug-in piece is used to connect or disconnect the mixing drum and the second observation chamber.

[0015] Furthermore, the control valve is provided with a through hole, the position of the through hole avoids the center of the control valve, the aperture of the through hole is less than or equal to 1 / 2 of the cross-sectional area of ​​the control valve, and the through hole on the control valve is connected to the bottom of the mixing drum through an arc transition.

[0016] Furthermore, the control valve includes a magnetic valve body, a shell is provided on the outside of the magnetic valve body, the magnetic valve body is a hollow rectangular structure, a stirring discharge port is provided at the center of the top of the magnetic valve body, the stirring discharge port is connected with the bottom discharge port of the mixing drum, a first observation chamber feed port and a second observation chamber feed port are respectively provided on both sides of the bottom of the magnetic valve body, a material control rod is installed in the magnetic valve body, the diameter of the material control rod is the same as the width of the magnetic valve body, the height of the material control rod is the same as the height of the magnetic valve body, the upper and lower ends of the material control rod are respectively connected to the magnetic valve body in a sliding and sealing manner, and the diameters of the stirring discharge port, the first observation chamber feed port and the second observation chamber feed port are all smaller than the diameter of the material control rod; two horizontally arranged connecting rods are symmetrically installed on both sides of the material control rod, the connecting rods extend out of the magnetic valve body and are connected to the magnetic valve body in a sliding and sealing manner, the other ends of the two connecting rods are respectively fixedly connected to the first electromagnet and the second electromagnet, a first spring group is installed between the first electromagnet and the shell, and a second spring group is installed between the second electromagnet and the shell.

[0017] Furthermore, a constant temperature control device is provided inside the mixing drum, and a heating resistance wire is provided in the middle layer of the main mixing shaft to ensure that the input water vapor will not condense into liquid water in the main mixing shaft.

[0018] Furthermore, there are multiple emulsified asphalt feed hoppers, each of which is provided with two layers of screens; the water inlet and the emulsified asphalt feed hopper are respectively provided with adjustable speed control valves, so that water and emulsified asphalt enter the mixing drum at a constant speed.

[0019] Furthermore, a lid that can be opened / closed is provided at the bottom of the first observation chamber and the second observation chamber, and a horizontally arranged screen is installed above the lid, and the screen is in contact with the upper surface of the lid.

[0020] A test method for the mixing stability of composite force field emulsified asphalt and water is carried out according to the following steps:

[0021] S1, set the temperature of the mixing drum, turn on the ring motor, apply air pressure to the internal water inlet channel of the main mixing shaft through the air pump, inject water vapor and emulsified asphalt into the mixing drum at a uniform speed through the water inlet and the emulsified asphalt feed hopper, and start mixing; after mixing evenly, control the valve to control the mixture in the mixing drum to enter the first observation room, and start timing;

[0022] S2, close the control valve and add the material for the second time. The speed and amount of the second addition are the same as those of the first addition. After stirring evenly, the mixed material in the mixing drum is controlled by the control valve to enter the second observation chamber, and the timing starts;

[0023] S3, after the time is reached, check whether the corresponding mixture has asphalt agglomeration and record the experimental results;

[0024] S4, repeating steps S1-S3, performing multiple tests and comparisons to determine whether the stability of the mixture of emulsified asphalt and water meets the requirements;

[0025] S5, after the test is finished, the first observation chamber and the second observation chamber are controlled to be opened, and the mixed material is recycled.

[0026] The beneficial effects of the present invention are:

[0027] (1) The present invention applies pressure to water vapor through air pressure, so that the water vapor fills the mixing drum. After the water vapor encounters the emulsified asphalt mass at room temperature, it condenses into liquid and adheres to the emulsified asphalt, thereby achieving the initial mixing of the emulsified asphalt and water. Multi-directional and multi-angle stirring devices are arranged to work together, combined with the centrifugal force-electromagnetic field composite force field, to achieve high-speed and uniform stirring of the emulsified asphalt and water, and to fully mix the water and the emulsified asphalt, thereby improving the mixing efficiency.

[0028] (2) The experimental process of the present invention is less affected by the environment and human operation, and can ensure standardized experimental conditions. The temperature and mixing time can be adjusted and displayed. It is more suitable for the uniform mixing of small doses of emulsified asphalt and water required for the experiment, and the emulsion can be quickly and uniformly stirred in all directions and at multiple angles in a short time. The static mixtures of the two groups of parallel experiments can be effectively observed and compared, and the test repeatability and reproducibility are good, making the test results more objective and scientific, providing a reliable basis for relevant practical applications or research.

[0029] (3) The present invention has a high degree of automation and is easy to operate; it is small in size, highly portable, and convenient for sampling and cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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 or the description of the prior art 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 work.

[0031] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0032] Figure 2 It is a stereogram of an embodiment of the present invention.

[0033] Figure 3 It is a schematic diagram of the structure of the control valve in Example 3 of the present invention.

[0034] Figure 4 It is a schematic structural diagram of a placement plate and a cross plate in an embodiment of the present invention.

[0035] In the figure, 1. annular motor, 2. first feed inlet, 3. second feed inlet, 4. mixing drum, 5. main mixing shaft, 6. H-type mixing paddle, 7. mixing blade with hole, 8. water inlet, 9. I-shaped mixing rod, 10. auxiliary mixing shaft, 11. spiral mixing paddle, 12. radial mixing paddle, 13. control valve, 14. observation room, 15. display screen operation table, 16. base, 17. inclined surface, 18. first electromagnetic coil, 19. second electromagnetic coil, 20. placement plate, 21. horizontal plate, 22. magnetic valve body, 23. filter screen, 24. first spring group, 25. first electromagnet, 26. connecting rod, 27. control rod, 28. stirring outlet, 29. first observation room feed inlet, 30. second observation room feed inlet, 31. shell, 32. second spring group, 33. second electromagnet. DETAILED DESCRIPTION

[0036] The following will be combined with 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 making creative work are within the scope of protection of the present invention.

[0037] Embodiment 1,

[0038] A composite force field emulsified asphalt and water mixing stability test device, such as Figure 1-2 As shown, it includes a mixing drum 4, a hollow main mixing shaft 5 is installed inside the mixing drum 4, a plurality of H-shaped mixing paddles 6 and I-shaped mixing rods 9 are arranged on the main mixing shaft 5, a mixing blade 7 with holes is arranged between the H-shaped mixing paddles 6 and the I-shaped mixing rod 9, and the I-shaped mixing rod 9 is located below the mixing blade 7 with holes; the upper end of the main mixing shaft 5 extends out of the top of the mixing drum 4 and is connected to the output shaft of the ring motor 1, the ring motor 1 controls the hollow main mixing shaft 5 to drive the H-shaped mixing paddle 6, the mixing blade 7 with holes, and the I-shaped mixing rod 9 to rotate simultaneously, and distilled water enters the main mixing shaft 5 through the water inlet 8 in the middle of the ring motor 1 under the action of air pressure, and under the action of air pressure, the distilled water is sprayed from the surface of the mixing blade 7 with holes, and then mixed with the emulsified asphalt, and an emulsified asphalt feed hopper is arranged on the top of the mixing drum 4; the H-shaped mixing paddle 6 and the I-shaped mixing rod 9 are fixedly connected to the main mixing shaft 5 through the corresponding auxiliary mixing shafts 10 respectively.

[0039] A spiral stirring paddle 11 is provided below the bottom H-shaped stirring paddle 6, and at least four radial stirring paddles 12 with a U-shaped longitudinal section are provided below the spiral stirring paddle 11. The spiral stirring paddle 11 is made of a spirally wound metal wire, and the upper port is larger than the lower port, and is conical. The upper port diameter of the spiral stirring paddle 11 is the same as the diameter of the H-shaped stirring paddle 6. The lower end outer edge of the spiral stirring paddle 11 and the U-shaped midpoint of the radial stirring paddle 12 along the radial direction are maintained in the same vertical line to achieve efficient stirring of the U-shaped stirring paddle. The spiral stirring paddle 11 mainly plays a role in buffering and gathering the emulsified asphalt falling from the top, reducing the impact of the mixture in the free fall state on the bottom of the mixing drum, and at the same time gathering the continuously falling mixture to the U-shaped stirring paddle for re-stirring.

[0040] Each radial stirring paddle 12 is fixedly connected to the corresponding motor output shaft through a rotating shaft, and the rotating shaft of each radial stirring paddle 12 is horizontally arranged and arranged along the radial direction of the mixing drum 4. The emulsified asphalt clumps falling down through the evenly perforated inclined surface are of different sizes. During the falling process, since the H-shaped stirring paddle 6, the perforated stirring blade 7, the I-shaped stirring rod 9, and the spiral stirring paddle 11 are difficult to fully stir the asphalt and water vapor near the inner wall of the mixing drum 4, the radial stirring paddle 12 can make up for this function well, mix and stir the mixed liquid again, and finally form a uniform emulsified asphalt and water mixture.

[0041] like Figure 4 As shown, a circular placement plate 20 is provided at the bottom center of the mixing drum 4, and the periphery of the placement plate 20 is fixedly connected to the inner wall of the mixing drum 4 through a radially arranged transverse plate 21, and there is a gap between adjacent transverse plates 21, which is convenient for the mixture to fall; the magnetic stirring rotor is placed on the placement plate 20, and an upwardly extending flange is provided around the placement plate 20 to prevent the magnetic stirring rotor from falling, and the diameter of the placement plate 20 is the same as the diameter of the lower port of the spiral stirring paddle 11; the top and bottom side walls of the mixing drum 4 are respectively provided with a first electromagnetic coil 18 and a second electromagnetic coil 19, and the first electromagnetic coil 18 and the second electromagnetic coil 19 are connected to a three-phase motor, and an alternating current with a difference of 120° is passed through the three-phase motor to generate a rotating magnetic field. The magnetic stirring rotor is olive-shaped and made of permanent magnetic material, which can generate directional rotation in the rotating magnetic field, thereby driving the emulsified asphalt liquid to form a vortex. After the mixture falls on the placement plate 20, it can generate centrifugal force to fall under the stirring action of the magnetic rotor, and will not continue to accumulate on the protective plate.

[0042] The rotation direction of the main stirring shaft 5 is opposite to that of the magnetic stirring rotor, and they do not cancel each other out. They together form a composite force field to achieve high-speed stirring and mixing of emulsified asphalt and water, making the emulsified asphalt more evenly distributed and preventing asphalt particles from agglomerating. Because the magnetic stirring rotor mainly provides the rotation tendency of the mixture in the air, that is, the emulsified asphalt spirals down during the falling process and has kinetic energy in the horizontal direction. The stirring rod on the main stirring shaft 5 provides a certain counter-force to the larger asphalt clumps that fall down so that they are broken up into smaller asphalt clumps. After being broken up, their surface area increases, thereby increasing the area in contact with water vapor and making the water distribution in the mixture more even.

[0043] A transparent observation chamber 14 is provided below the mixing drum 4, and a control valve 13 is provided between the mixing drum 4 and the observation chamber 14. The observation chamber 14 is made of transparent material, and the middle of the observation chamber 14 is divided into two identical semi-cylindrical containers by a transparent partition, namely, the first observation chamber and the second observation chamber; the upper end of the control valve 13 is rotatably sealed and connected to the bottom of the mixing drum 4, and the lower end of the control valve 13 is rotatably sealed and connected to the observation chamber 14. A through hole is provided on the control valve 13, and the position of the through hole avoids the center of the control valve 13, and the aperture of the through hole is less than or equal to 1 / 2 of the cross-sectional area of ​​the control valve 13; when the control valve 13 is rotated to the point that the through hole is only connected to the first observation chamber, the mixture in the mixing drum 4 enters the first observation chamber, and when the control valve 13 is rotated to the point that the second observation chamber is only connected, the mixture in the mixing drum 4 enters the second observation chamber, and the mixing time is the time when the quantitative emulsified asphalt and water mixture all passes through the mixing drum and reaches the observation chamber. After two mixings, the mixture enters the first observation chamber and the second observation chamber respectively, and the experimental results are compared and observed.

[0044] The inner wall of the constant temperature mixing drum 4 is coated with an anti-stick coating. The bottom of the observation chamber 14 (the first observation chamber and the second observation chamber) is provided with a lid that can be opened / closed to facilitate the outflow of the mixture. The lid is sealed and connected to the bottom of the observation chamber 14 through a sealing ring. A horizontally arranged screen is installed above the lid at the bottom of the observation chamber 14. The screen is in contact with the upper surface of the lid, and the aperture of the screen is 1mm. A rubber ring is provided at the edge of the upper cover with a stirring shaft at the top of the mixing drum 4 to improve the sealing performance of the upper cover and the mixing drum 4, and to prevent the emulsified asphalt and water from overflowing or seeping from the joint between the upper cover and the mixing drum 4 during stirring. The upper cover is provided with an exhaust hole to prevent excessive pressure in the container during stirring; a constant temperature control device is provided inside the mixing drum 4, and the constant temperature control device includes a heating resistor wire, a temperature sensor, and a controller, which are known in the art, to ensure stirring at the required temperature (constant temperature 25°C); in addition, after the test is completed, the temperature is adjusted to increase to facilitate the cleaning of residual emulsified asphalt.

[0045] A display screen operation table 15 is provided below the observation room 14, and a base 16 is provided at the bottom of the display screen operation table 15. The model of the display screen operation table 15 is 19264A, and its function is to time and control the heating temperature of the resistance wire, control the start and end rotation of each stirring paddle, control the opening direction of the valve and the amount of current flowing through the electromagnetic coil to generate electromagnetic fields of different intensities. A detachable disc is provided on the base 16, and after the lid is opened, the emulsified asphalt in the observation room can fall on the lid; the detachable disc has a certain depth, which is convenient for collecting and removing the emulsified asphalt and water from the observation room when it is opened, and convenient for cleaning the instrument.

[0046] The observation room 14 can be provided with a heating resistor to adjust the temperature and a temperature sensing rod, and the temperature is displayed on the display screen of the display screen operation console 15.

[0047] There are two emulsified asphalt feed hoppers, namely the first feed port 2 and the second feed port 3. The emulsified asphalt is poured in two portions at the same time so that it flows more evenly into the mixing drum 4. The first feed port 2 and the second feed port 3 are both provided with two layers of screens to ensure that the particle size of the mixed asphalt is less than 1.18 mm, and the distance between the two layers of screens is 10 cm.

[0048] The water inlet 8 and the emulsified asphalt feed hopper are respectively provided with adjustable speed control valves, so that 150ml of distilled water and 60ml of emulsified asphalt enter the mixing drum 4 with a volume of 1000ml at a constant speed. In order to increase the contact area between the emulsified asphalt and water when it flows into the mixing drum 4 and distribute it more evenly in space, an inclined surface 17 with uniform holes is provided. The emulsified asphalt flows into the constant temperature mixing drum 4 through the inclined surface 17 with uniform holes. A large area of ​​water is sprayed from the row holes provided on the lower side of all the perforated mixing blades, which can increase the contact area between the emulsified asphalt and water, making the contact more uniform in a short time, thereby stirring more evenly faster; the main stirring shaft 5, the auxiliary stirring shaft 10, the H-type stirring paddle 6, the perforated stirring blade 7, the I-shaped stirring rod 9 and the radial stirring paddle 12 at the bottom work together to stir at high speed in all directions and angles to ensure sufficient stirring within a certain period of time.

[0049] In the embodiment of the present invention, the H-type stirring paddle 6, the perforated stirring blade 7, and the I-shaped stirring rod 9 rotate coaxially, and the upper surface of the perforated stirring blade 7 is evenly and densely covered with fine holes. Under the drive of air pressure, water vapor is sprayed into the barrel, and the water vapor will fill the entire stirring barrel. A heating resistor wire is arranged in the middle layer of the main stirring shaft 5 to ensure that the water vapor input from the inlet will not condense into liquid water in the main stirring shaft. The emulsified asphalt entering the stirring barrel 4 from the feeding port through the evenly perforated inclined surface generates kinetic energy in the horizontal direction in the rotating vortex, and is dispersed into smaller emulsified asphalt groups after being impacted and struck in opposite directions by the H-type stirring paddle 6 and the I-shaped stirring rod 9. After the water vapor encounters the emulsified asphalt group at room temperature, it condenses into liquid and adheres to the emulsified asphalt, thereby realizing the initial mixing of the emulsified asphalt and water. The mixture after the initial mixing of the emulsified asphalt and water falls on the spiral stirring paddle 11, which reduces the kinetic energy of the mixture in the vertical direction and reduces the impact on the bottom electromagnetic valve. After the spiral stirring paddle gathers the mixture, it falls on the radial stirring paddle 12 for secondary mixing. In the embodiment, after the feeding is completed, the radial stirring paddle 12 continues stirring for 5 minutes to achieve secondary stirring of the mixture to form a final mixture of emulsified asphalt and water stability test.

[0050] Since emulsified asphalt has a certain viscosity and continuity, the traditional test scheme cannot achieve a sufficient and uniform mixing of water and asphalt in small molecular clusters simply by manual stirring, so that the test results are often not ideal and scientific. The embodiment of the present invention solves the problem that the test results are greatly affected by the stirring conditions due to uneven mixing in traditional tests by using physical striking of asphalt clusters in combination with natural adhesion of water vapor and secondary mechanical mixing and stirring. The embodiment of the present invention makes the water content in the emulsified asphalt more evenly distributed, greatly reduces the influence of human subjective factors on the test results, and makes the test results more objective and scientific.

[0051] Inverted V-shaped baffles with an angle of 5-10° are arranged on both sides of the bottom of the perforated stirring blade 7, and a plurality of water outlet holes are evenly arranged at the bottom of the perforated stirring blade 7 inside the inverted V-shaped baffle. Since an I-shaped stirring rod 9 is provided below the perforated stirring blade 7 to guide the radial movement of the mixture, combined with the inverted V-shaped baffle, the stirring efficiency can be ensured while preventing the mixture from blocking the water outlet holes, thereby ensuring the smooth ejection of water vapor and improving the test accuracy.

[0052] Embodiment 2,

[0053] Two mechanical plug-in plates are arranged inside the control valve 13, one mechanical plug-in plate is used for connecting or disconnecting the mixing drum 4 and the first observation chamber, and the other mechanical plug-in plate is used for connecting or disconnecting the mixing drum 4 and the second observation chamber.

[0054] Embodiment 3,

[0055] like Figure 3As shown, the control valve 13 includes a magnetic valve body 22, and a shell 31 is provided on the outside of the magnetic valve body 22. The magnetic valve body 22 is a hollow rectangular structure. A stirring discharge port 28 is provided at the center of the top of the magnetic valve body 22. The stirring discharge port 28 is connected to the bottom discharge port of the mixing drum 4. A first observation chamber feed port 29 and a second observation chamber feed port 30 are respectively provided on both sides of the bottom of the magnetic valve body 22. A material control rod 27 is installed in the magnetic valve body 22. The diameter of the material control rod 27 is the same as the width of the magnetic valve body 22, and the height of the material control rod 27 is the same as the height of the magnetic valve body 22, so as to ensure that when feeding one observation chamber 14, the material control rod 27 can effectively prevent the mixture from entering the other observation chamber 14. At the same time, in the process of the material control rod 27 moving left and right, the material can be well allowed to enter the two observation chambers 14, and the mixture will not accumulate in the magnetic valve body 22. The upper and lower ends of the material control rod 27 are respectively connected to the magnetic valve body 22 in a sliding and sealing manner. The diameters of the stirring discharge port 28, the first observation chamber feed port 29 and the second observation chamber feed port 30 are all 9 / 10 of the diameter of the material control rod 27, that is, they are all smaller than the diameter of the material control rod 27. Two horizontally arranged connecting rods 26 are symmetrically installed on both sides of the material control rod 27. The connecting rods 26 extend out of the magnetic valve body 22 and are connected to the magnetic valve body 22 in a sliding and sealing manner. The other ends of the two connecting rods 26 are respectively fixedly connected to the first electromagnet 25 and the second electromagnet 33. A first spring group 24 is installed between the first electromagnet 25 and the housing 31, and a second spring group 32 is installed between the second electromagnet 33 and the housing 31. A filter screen 23 is arranged at the first observation chamber feed port 29 and the second observation chamber feed port 30 to prevent impurities from entering the observation chamber 14 during the stirring process to avoid affecting the experimental results.

[0056] When the emulsified asphalt is stirred with water, the first electromagnet 25 and the second electromagnet 33 are not energized, and the control rod 27 is located in the middle position of the magnetic valve body 22, which can seal the stirring discharge port 28, so that the mixture will not flow into the observation chamber 14 during the stirring process. After the stirring is completed, the first electromagnet 25 is energized to generate electromagnetic force, so that the first electromagnet 25 is attracted to the side wall of the magnetic valve body 22, and the control rod 27 is pushed to move to the other side wall of the magnetic valve body 22 through the connecting rod 26, which can seal the feed port 30 of the second observation chamber, and at the same time, the stirring discharge port 28 and the feed port 29 of the first observation chamber are both in an open state, and the mixed material enters the first observation chamber; after the mixture has completely entered the first observation chamber, the first electromagnet 25 and the second electromagnet 33 are not energized, and the control rod 27 returns to the middle position under the restoring force of the first spring group 24 and the second spring group 32, and the stirring discharge port 28 is sealed, and the second stirring begins. After the second stirring is completed, the first electromagnet 25 is powered off and the second electromagnet 33 is powered on. The electromagnetic force causes the second electromagnet 33 to be attracted to the side wall of the magnetic valve body 22, and the material control rod 27 is pushed to move to the other side wall of the magnetic valve body 22 through the connecting rod 26, so as to seal the first observation chamber feed port 29. At the same time, the stirring discharge port 28 and the second observation chamber feed port 30 are both in an open state, and the mixed material enters the second observation chamber (see Figure 3 ), at this time, the first spring group 24 is in a compressed state, and the second spring group 32 is in a stretched state. After the mixture has all entered the second observation chamber, the second electromagnet 33 is powered off, and the control rod 27 is restored to the middle position under the restoring force of the first spring group 24 and the second spring group 32, and the stirring outlet 28 is sealed, and then the second group of experimental stirring is started. The first spring group 24 and the second spring group 32 are both composed of two horizontal springs to ensure that the upper and lower parts of the first electromagnet 25 and the second electromagnet 33 are balanced, and provide sufficient restoring force to reset the control rod 27.

[0057] Embodiment 4,

[0058] In Example 1, the through hole on the control valve 13 is connected to the bottom of the mixing drum 4 through an arc transition, so that the mixed material in the mixing drum 4 can smoothly pass through the through hole into the first observation chamber or the second observation chamber.

[0059] Embodiment 5,

[0060] A composite force field emulsified asphalt and water mixing stability test method, specifically:

[0061] S1, set the temperature of the mixing drum 4, turn on the ring motor 1, apply air pressure to the internal water inlet channel of the main mixing shaft 5 through the air pump, press water into the mixing paddle and spray it out at a uniform speed, adjust the control valves of the water inlet and the emulsified asphalt feed hopper, and inject water and emulsified asphalt into the mixing drum 4 at a uniform speed through the water inlet and the emulsified asphalt feed hopper to start mixing; after mixing evenly, control the valve 13 to control the mixture in the mixing drum 4 to enter the first mixing chamber, and start timing;

[0062] S2, close the control valve 13 and add the material for the second time. The speed and amount of the second addition are the same as those of the first addition. After stirring evenly, the mixed material in the mixing drum 4 is controlled by the control valve 13 to enter the second mixing chamber, and the timing starts.

[0063] S3, after the time is reached (standing at 25°C for 2h), check whether the corresponding mixture has asphalt agglomeration and record the experimental results; or open the bottom cover of the observation chamber 14, the emulsified asphalt will flow out through the screen, but if there is agglomeration, it will remain on the screen, so as to judge the stability of the emulsified asphalt and water mixture; the mass and particle size of the agglomerates obtained by testing different emulsified asphalts can also be used to quantitatively evaluate the stability of the emulsified asphalt and water mixture;

[0064] S4, repeating steps S1-S3, performing multiple tests and comparisons to determine whether the stability of the mixture of emulsified asphalt and water meets the requirements;

[0065] S5, recycle the mixed material; fasten the base cover, add water from the water inlet, increase the flow rate, stir quickly to clean the container.

[0066] When the existing test device is used to test the mixing stability of emulsified asphalt and water, manual stirring has certain subjective factors, so it is often necessary to do more groups of experiments for comparison, which wastes experimental raw materials to a certain extent and has poor reliability. The time for the mixture of the present invention to pass through the mixing drum under the action of each stirring structure is the stirring time, which saves time and labor; the present invention realizes high-speed and uniform stirring of emulsified asphalt and water, and fully mixes water and emulsified asphalt, improves mixing efficiency, has less human operation impact, and has strong repeatability, which provides a strong guarantee for the accuracy and scientificity of comparative experiments and reproducible experiments.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A composite force field emulsified asphalt and water mixing stability test device, characterized in that: include A mixing drum (4), wherein a hollow main mixing shaft (5) is installed inside the mixing drum (4), and a plurality of H-shaped mixing paddles (6) and I-shaped mixing rods (9) are arranged on the main mixing shaft (5), and a mixing blade (7) with holes is arranged between the H-shaped mixing paddles (6) and the I-shaped mixing rod (9), and the I-shaped mixing rod (9) is located below the mixing blade (7) with holes; the upper end of the main mixing shaft (5) extends out of the top of the mixing drum (4) and is connected to the output shaft of the ring-shaped motor (1), and the ring-shaped motor (1) controls the hollow main mixing shaft (5) to drive the H-shaped mixing paddles (6), the mixing blades with holes (7), and the I-shaped mixing rod (9) to rotate simultaneously; A water inlet (8), wherein the water inlet (8) is located in the middle of the ring-shaped motor (1), and water vapor enters the interior of the main stirring shaft (5) through the water inlet (8) under the action of pump pressure and is ejected from the drainage hole at the bottom of the perforated stirring blade (7); inverted V-shaped baffles with an angle of 5-10° are arranged on both sides of the bottom of the perforated stirring blade (7); An emulsified asphalt feed hopper, the emulsified asphalt feed hopper being arranged on the top of the mixing drum (4); A first observation chamber and a second observation chamber, wherein the first observation chamber and the second observation chamber are separated from each other and are both arranged below the mixing drum (4); A control valve (13) for controlling the mixed material flowing out of the mixing drum (4) to enter the first observation chamber or the second observation chamber; A spiral stirring paddle (11) is provided below the I-shaped stirring rod (9) at the bottom. The spiral stirring paddle (11) is formed by spirally winding a metal wire. The upper end of the spiral stirring paddle (11) is larger than the lower end and is tapered. A plurality of radial stirring paddles (12) with a U-shaped longitudinal section are provided below the spiral stirring paddle (11). The rotating shaft of each radial stirring paddle (12) is arranged horizontally and radially along the stirring drum (4). The diameter of the upper end of the spiral stirring paddle (11) is the same as that of the H-shaped stirring paddle (6), and the diameter of the lower end of the spiral stirring paddle (11) is not less than the radial spacing between two opposite radial stirring paddles (12). A circular placement plate (20) is provided at the center of the bottom of the mixing drum (4), and the periphery of the placement plate (20) is fixedly connected to the inner wall of the mixing drum (4) through radially arranged transverse plates (21), and there is a gap between adjacent transverse plates (21) to facilitate the falling of the mixed material; the magnetic stirring rotor is placed on the placement plate (20), and the diameter of the placement plate (20) is the same as the diameter of the lower port of the spiral stirring paddle (11); the top and bottom side walls of the mixing drum (4) are respectively provided with a first electromagnetic coil (18) and a second electromagnetic coil (19), and the first electromagnetic coil (18) and the second electromagnetic coil (19) are connected to a three-phase motor, and an alternating current with a mutual difference of 120 degrees is introduced through the three-phase motor to drive the magnetic stirring rotor to rotate and drive the liquid to generate a rotating vortex, and the rotation direction of the main stirring shaft (5) is opposite to the rotation direction of the magnetic stirring rotor, and together they form a composite force field; A constant temperature control device is provided inside the mixing drum (4), and a heating resistance wire is provided in the middle layer of the main mixing shaft (5) to ensure that the input water vapor will not condense into liquid water in the main mixing shaft (5).

2. According to claim 1, a composite force field emulsified asphalt and water mixing stability test device is characterized in that: Two mechanical plug-in plates are arranged inside the control valve (13), one mechanical plug-in plate is used to connect or disconnect the mixing drum (4) and the first observation chamber, and the other mechanical plug-in plate is used to connect or disconnect the mixing drum (4) and the second observation chamber.

3. According to claim 1, a composite force field emulsified asphalt and water mixing stability test device is characterized in that: The control valve (13) is provided with a through hole, the position of the through hole is away from the center of the control valve (13), the aperture of the through hole is less than or equal to 1 / 2 of the cross-sectional area of ​​the control valve (13), and the through hole on the control valve (13) is connected to the bottom of the mixing drum (4) through an arc transition.

4. According to claim 1, a composite force field emulsified asphalt and water mixing stability test device is characterized in that: The control valve (13) comprises a magnetic valve body (22), a shell (31) is arranged outside the magnetic valve body (22), the magnetic valve body (22) is a hollow rectangular parallelepiped structure, a stirring discharge port (28) is arranged at the center of the top of the magnetic valve body (22), the stirring discharge port (28) is connected to the bottom discharge port of the stirring drum (4), a first observation chamber feed port (29) and a second observation chamber feed port (30) are arranged on both sides of the bottom of the magnetic valve body (22), a control rod (27) is installed in the magnetic valve body (22), the diameter of the control rod (27) is the same as the width of the magnetic valve body (22), the height of the control rod (27) is the same as the height of the magnetic valve body (22), and the upper and lower ends of the control rod (27) are They are respectively connected to the magnetic valve body (22) in a sliding and sealing manner, and the diameters of the stirring discharge port (28), the first observation chamber feed port (29) and the second observation chamber feed port (30) are all smaller than the diameter of the control rod (27); two horizontally arranged connecting rods (26) are symmetrically installed on both sides of the control rod (27), the connecting rods (26) extend out of the magnetic valve body (22) and are connected to the magnetic valve body (22) in a sliding and sealing manner, and the other ends of the two connecting rods (26) are respectively fixedly connected to the first electromagnet (25) and the second electromagnet (33), a first spring group (24) is installed between the first electromagnet (25) and the housing (31), and a second spring group (32) is installed between the second electromagnet (33) and the housing (31).

5. According to claim 1, a composite force field emulsified asphalt and water mixing stability test device is characterized in that: There are multiple emulsified asphalt feed hoppers, each of which is provided with two layers of screens; the water inlet (8) and the emulsified asphalt feed hopper are respectively provided with adjustable speed control valves, so that water and emulsified asphalt enter the mixing drum (4) at a constant speed.

6. According to claim 1, a composite force field emulsified asphalt and water mixing stability test device is characterized in that: The bottom of the first observation chamber and the second observation chamber is provided with a lid which can be opened / closed, and a horizontally arranged screen is installed above the lid, and the screen is in contact with the upper surface of the lid.

7. A method for testing the mixing stability of composite force field emulsified asphalt and water, characterized in that: Using the composite force field emulsified asphalt and water mixing stability test device as claimed in claim 1, the following steps are carried out: S1, setting the temperature of the mixing drum (4), turning on the ring motor (1), applying air pressure to the internal water inlet channel of the main mixing shaft (5) through an air pump, injecting water vapor and emulsified asphalt into the mixing drum (4) at a uniform speed through the water inlet (8) and the emulsified asphalt feed hopper, and starting mixing; after the mixing is uniform, controlling the valve (13) to control the mixed material in the mixing drum (4) to enter the first observation chamber, and starting the timing; S2, close the control valve (13) and add the material for the second time, the speed and amount of the second addition are the same as those of the first addition; after stirring evenly, control the control valve (13) to control the mixed material in the mixing drum (4) to enter the second observation chamber, and start timing; S3, after the time is reached, check whether the corresponding mixture has asphalt agglomeration and record the experimental results; S4, repeating steps S1-S3, performing multiple tests and comparisons to determine whether the stability of the mixture of emulsified asphalt and water meets the requirements; S5. After the test, the mixed material is recycled.

Images