Matrix asphalt adding device for preparing emulsified asphalt

Abstract

The matrix asphalt adding device comprises a stirring device, the stirring device is arranged on the upper portion of an asphalt storage box, and the output end of the stirring device extends into the asphalt storage box; the asphalt storage box comprises a storage box body, and a heating device is arranged in a bottom plate of the storage box body; a discharging opening is formed in the center of the bottom of the storage box body, and a flow measuring device is arranged at the discharging opening; the lower end of the flow measuring device is connected with a feeding hole of the colloid mill; the stirring device and the heating device are both connected with the controller; by arranging the asphalt storage box and the heating device, matrix asphalt is heated and stirred, and heat loss of the matrix asphalt is avoided; the flow measuring device is used for measuring the flow of the matrix asphalt and accurately controlling the addition amount, the undesirable phenomena such as demulsification or segregation in the preparation process of the emulsified asphalt are avoided, the physical and chemical properties of emulsified asphalt residues are ensured, and the field application of the emulsified asphalt is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of highway engineering material preparation, and particularly relates to a matrix asphalt adding device for preparing emulsified asphalt. Background Art

[0002] Emulsified asphalt, with its multiple advantages such as cold-state construction, energy conservation and environmental protection, shows broad application prospects in the field of highway engineering. It can not only be used as a binder for micro-surfacing, slurry seal and chip seal, but also plays an important role in tack coat and prime coat. In order to deepen the popularization and application of emulsified asphalt in highway engineering, researchers usually conduct indoor tests to comprehensively analyze and verify its performance. Indoor tests are not only a key link in material research and development, but also a basic requirement for the practical application of emulsified asphalt.

[0003] When conducting indoor tests, especially those for the properties of emulsified asphalt itself and its residues, it is crucial to prepare high-quality raw materials for emulsified asphalt. This is usually based on matrix asphalt and prepared into an oil-in-water type emulsified asphalt through a specific emulsification process. The performance of emulsified asphalt is not only affected by its components, but the preparation conditions also play a decisive role. Currently, high-speed shear colloid mills are commonly used for indoor preparation of emulsified asphalt, and this process includes three core steps: addition of soap solution, addition of matrix asphalt, and discharging. However, in the process of adding matrix asphalt, the traditional manual pouring method has exposed a series of problems. First, there is a lack of effective heat preservation measures for matrix asphalt during the pouring process, resulting in a rapid drop in its temperature, which poses a direct threat to the emulsification effect. Second, it is difficult to maintain a constant pouring flow rate, and multiple pourings are often required to reach the preset amount of matrix asphalt. This process further exacerbates the temperature drop and further affects the emulsification effect. Moreover, manual pouring cannot accurately control the addition amount of matrix asphalt, which not only leads to deviations in the residue content of emulsified asphalt, but may also have an adverse impact on the road performance of emulsified asphalt and its residues. In addition, the high temperature of matrix asphalt (usually reaching 140°C) makes manual pouring a high-risk operation, and operators face the danger of burns or scalds.

[0004] The problems existing in the above matrix asphalt adding process not only concern the preparation efficiency and quality of emulsified asphalt, but also directly affect its on-site application effect. Problems such as too rapid a temperature drop of matrix asphalt, discontinuous pouring with an unconstant flow rate, and inability to accurately control the addition amount are important reasons for the occurrence of adverse phenomena such as demulsification and segregation of emulsified asphalt, as well as the decline in the performance of residues. The root cause of these problems lies in the lack of a special device for adding matrix asphalt. Therefore, it is particularly urgent to develop a matrix asphalt adding device that can effectively solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a matrix asphalt adding device for the preparation of emulsified asphalt, so as to solve the technical problems existing in the process of adding matrix asphalt, such as too rapid decrease in the temperature of the matrix asphalt, discontinuous pouring, non-constant pouring flow rate, and inaccurate control of the asphalt addition amount.

[0006] To achieve the above object, the technical solution of the present invention is: a matrix asphalt adding device for the preparation of emulsified asphalt, comprising a stirring device, an asphalt storage tank and a controller; the stirring device is arranged above the asphalt storage tank, and the output end of the stirring device extends into the asphalt storage tank; The asphalt storage tank includes a storage box body, a heating device and a flow rate measuring device. The storage box body is used for storing matrix asphalt, and a heating device is arranged in the bottom plate of the storage box body; a discharge port is arranged at the center of the bottom of the storage box body, and a flow rate measuring device is arranged at the discharge port of the storage box body; the upper end of the flow rate measuring device is connected to the discharge port of the storage box body, and the lower end is connected to the feed port of the colloid mill; both the stirring device and the heating device are connected to the controller.

[0007] Further, the stirring device is steplessly speed-regulated at 200 rpm to 600 rpm. The stirring device includes a cover plate, a motor and stirring blades. The cover plate is fitted and installed at the upper end of the storage box body, the motor is installed above the cover plate, the output end of the motor penetrates through the center of the cover plate, and the stirring blades are arranged in the storage box body and connected to the output end of the motor; the motor is electrically connected to the controller.

[0008] Further, a temperature sensor is arranged on the stirring device. The temperature sensor is arranged radially along the stirring shaft, and its detection end extends to the center position of the stirring cavity, configured to monitor the process temperature range of 120°C to 180°C in real time; the detection end of the temperature sensor extends into the storage box body, and the signal output end of the temperature sensor is electrically connected to the controller.

[0009] Further, the working temperature range of the asphalt storage tank is 135°C to 165°C; the axial temperature difference in the storage box body ≤ 5°C, and the radial temperature difference ≤ 3°C; the size of the discharge port of the storage box body is set according to the type and dosage of the matrix asphalt.

[0010] Further, a support structure is arranged at the bottom of the storage box body. The height of the support structure is 15 cm to 20 cm; the upper end of the support structure is fixedly connected to the storage box body, and the lower end is detachably connected to the top of the feed port of the colloid mill.

[0011] Further, it further includes a feed funnel, which is arranged between the flow rate measuring device and the colloid mill; the feed port of the feed funnel is connected to the lower end of the flow rate measuring device, and the discharge port of the feed funnel is connected to the feed port of the colloid mill; the lower end of the support structure is detachably connected to the top of the feed funnel.

[0012] Further, the heating device uses an electric heating wire, which is evenly arranged in a planar spiral shape on the bottom plate of the storage box body. The electric heating wire is electrically connected to the controller. The surface power density of the electric heating wire is 30 W / cm² - 50 W / cm², and the temperature control accuracy is ±1.5°C.

[0013] Further, the flow measurement device includes an upper connecting pipe, an asphalt flow meter, a lower connecting pipe, and a control valve. The upper end of the upper connecting pipe is connected to the discharge port of the storage box body, the lower end of the upper connecting pipe is connected to one end of the asphalt flow meter, the other end of the asphalt flow meter is connected to the upper end of the lower connecting pipe, the lower end of the lower connecting pipe is connected to the feed inlet of the colloid mill, and a control valve is arranged on the lower connecting pipe.

[0014] Further, the asphalt flow meter includes a measuring pipe, a measuring base, a flow blocking member, a measuring rod, a capacitance force sensor, a preamplifier, an A / D converter, a microprocessor, and a display device. The measuring pipe is vertically arranged between the upper connecting pipe and the lower connecting pipe, and the measuring base is arranged on the side wall of the measuring pipe. The measuring rod is horizontally arranged in the measuring base, one end of the measuring rod is connected to the capacitance force sensor, the other end is a free end and is located on the central axis of the measuring pipe, and the flow blocking member is installed above the free end of the measuring rod. The capacitance force sensor is installed on the measuring base, the output end of the capacitance force sensor is connected to the input end of the preamplifier, the output end of the preamplifier is connected to the input end of the A / D converter, the output end of the A / D converter is connected to the input end of the microprocessor, and the output end of the microprocessor is connected to the display device.

[0015] Further, the controller includes a motor speed regulator and a temperature regulator. The motor speed regulator is electrically connected to the stirring device, and the temperature regulator is electrically connected to the heating device.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a matrix asphalt adding device for emulsified asphalt preparation. By setting an asphalt storage tank and a heating device in the asphalt storage tank, heating and heat preservation of the matrix asphalt to be added in the asphalt storage tank are realized. At the same time, a stirring device is set to ensure uniform distribution of the temperature of the matrix asphalt, effectively preventing heat dissipation and temperature reduction of the matrix asphalt during the adding process, and thus ensuring the emulsification effect of the matrix asphalt. By setting a flow measurement device, the flow rate of the matrix asphalt is measured by the asphalt flow meter when adding the matrix asphalt, realizing real-time and accurate control of the adding amount of the matrix asphalt, ensuring the physical and chemical properties of the emulsified asphalt residue, and ensuring the on-site application of the emulsified asphalt.

[0017] Further, by setting a feed funnel between the flow measurement device and the colloid mill, splashing of the emulsion during the operation cycle of the colloid mill is avoided, ensuring the emulsification effect of the matrix asphalt.

[0018] Furthermore, in the stirring device, by installing the motor on the cover plate and connecting the cover plate to the storage box body, effective stirring of the matrix asphalt in the storage box body is achieved, and at the same time, it has a heat preservation effect, avoiding heat dissipation during the stirring process; by connecting the motor to the controller, real-time adjustment of the motor speed can be realized to meet different stirring conditions.

[0019] Furthermore, by setting a temperature sensor, real-time monitoring of the temperature of the matrix asphalt to be added is achieved, ensuring the emulsification effect of the matrix asphalt.

[0020] Furthermore, by setting heat-insulating asbestos in the cover plate and the housing of the storage box body, the heat preservation effect of the storage box body is improved, avoiding heat dissipation of the matrix asphalt, and reducing the energy consumption of the heating device.

[0021] Furthermore, the heating device uses electric heating wires uniformly arranged in a planar spiral shape, which can achieve uniform heating and has a high heating efficiency.

[0022] Furthermore, a capacitance force sensor is used as the measurement and sensitive transmission element. When the asphalt passes through the measurement tube, the flow resistance element generates a pressure difference due to the kinetic energy of the asphalt itself and senses the acting force of the asphalt; the acting force sensed by the flow resistance element is transmitted to the capacitance force sensor through the measuring rod, and a voltage signal is output through the capacitance force sensor; after the voltage signal is pre-amplified, AD-converted and processed by the microprocessor, the instantaneous flow rate and cumulative total amount of the asphalt can be obtained. The measurement principle is simple and the measurement result has high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the matrix asphalt adding device described in the present invention; Figure 2 It is a schematic diagram of the structure of the stirring device in the matrix asphalt adding device described in the present invention; Figure 3 It is a schematic diagram of the structure of the asphalt storage tank in the matrix asphalt adding device described in the present invention; Figure 4 It is a schematic diagram of the structure of the flow rate measuring device in the matrix asphalt adding device described in the present invention; Figure 5 It is a schematic diagram of the structure of the controller in the matrix asphalt adding device described in the present invention; Figure 6 It is a circuit diagram for adjusting the motor speed in the matrix asphalt adding device described in the present invention; Figure 7 It is a circuit diagram for adjusting the temperature of the electric heating wire in the matrix asphalt adding device described in the present invention; Figure 8 It is a schematic diagram of the working principle of the flow rate measuring device in the matrix asphalt adding device described in the present invention.

[0024] Among them, 1 is a stirring device, 2 is an asphalt storage tank, 3 is a controller, 4 is a feed hopper, and 5 is a colloid mill; 11 is a cover plate, 12 is a motor, 13 is a stirring blade, and 14 is a temperature sensor; 21 is a storage box body, 22 is a support structure, 23 is a heating device, 24 is a flow measurement device, and 25 is a handle; 241 is an upper connecting pipe, 242 is an asphalt flow meter, 243 is a lower connecting pipe, and 244 is a control valve. Specific embodiments

[0025] The following will describe in detail the specific embodiments of the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention.

[0026] The present invention provides a matrix asphalt adding device for emulsified asphalt preparation, including a stirring device 1, an asphalt storage tank 2, a controller 3, and a feed hopper 4; the stirring device 1 is arranged on the upper part of the asphalt storage tank 2, and the output end of the stirring device 1 extends into the asphalt storage tank 2. The asphalt storage tank 2 is used to store matrix asphalt and heat and keep the matrix asphalt warm; the asphalt storage tank 2 is arranged above the feed hopper 4, and a discharge port is arranged at the center of the bottom of the asphalt storage tank 2. The discharge port of the asphalt storage tank 2 is connected to the feed port of the feed hopper 4, and the discharge port of the feed hopper 4 is connected to the feed port of the colloid mill 5; the stirring device 1 is connected to the controller 3.

[0027] Preferably, as Figure 2 shown, the stirring device 1 includes a cover plate 11, a motor 12, stirring blades 13, and a temperature sensor 14. The cover plate 11 is cooperatively arranged at the upper end of the asphalt storage tank 2. The motor 12 is installed above the cover plate 11, and the output end of the motor 12 penetrates through the center of the cover plate 11. The stirring blades 13 are arranged in the storage box body 21, and the stirring blades 13 are connected to the output end of the motor 12; the input end of the motor 12 is electrically connected to the controller 3; the temperature sensor 14 is fixedly penetrated through the cover plate 11 and is arranged near the edge of the cover plate; the detection end of the temperature sensor 14 extends into the matrix asphalt, and the signal output end of the temperature sensor 14 is electrically connected to the controller 3.

[0028] Preferably, the stirring device 1 is configured to have a stepless speed regulation function of 200 rpm to 600 rpm. It is recommended to adjust the speed to 200 rpm to 300 rpm during the start-up stage, and it is recommended to adjust the speed to 350 rpm to 500 rpm during the normal stirring stage. In addition, the speed can be adjusted to 500 rpm to 600 rpm according to actual needs for viscosity compensation to avoid local solidification or uneven mixing of the matrix asphalt caused by temperature drop; Preferably, the bottom end of the stirring blade 13 of the stirring device 1 maintains an operating distance of 50 mm to 80 mm from the inner bottom surface of the storage box 21, which is the minimum distance to meet the shear force transmission requirements and prevent the formation of a sediment layer; Preferably, the temperature sensor 14 is arranged radially along the stirring shaft, and its detection end extends to the center position of the stirring cavity, configured to real-time monitor the process temperature range of 120 °C to 180 °C; Preferably, the operating temperature range of the asphalt storage tank 2 is 135 °C to 165 °C, and at the same time, the temperature gradient should be controlled such that the axial temperature difference ≤ 5 °C and the radial temperature difference ≤ 3 °C; As Figure 3 shown, the asphalt storage tank 2 includes a storage box 21, a support structure 22, a heating device 23, a flow measurement device 24, and a handle 25. The storage box 21 is arranged between the stirring device 1 and the feed hopper 4, and the storage box 21 is used to store the base asphalt; the cover plate 11 is fitted and installed at the upper end of the storage box 21, and the support structure 22 is arranged at the lower end of the storage box 21; the upper end of the support structure 22 is fixedly connected to the bottom of the storage box 21, and the lower end of the support structure 22 is movably connected to the feed hopper 4, realizing the separation of the asphalt storage tank 2 from the feed hopper 4; the heating device 23 is arranged in the bottom plate of the storage box 21, and the heating device 23 uses an electric heating wire. As Figure 7 shown, the electric heating wire is evenly arranged in a planar spiral shape in the bottom plate of the storage box 21. The surface power density of the electric heating wire needs to be controlled within 30 W / cm² to 50 W / cm² to prevent local overheating from causing asphalt aging. The electric heating wire is electrically connected to the controller 3; the heating device 23 is linked with the controller 3 to adjust the power output in real time, and the temperature control accuracy needs to reach ±1.5 °C; handles 25 are symmetrically arranged on the outside of the storage box 21, and the handles 25 are arranged near the top end of the storage box 21. By setting the handles 25, it is convenient to move the storage box 21; preferably, the handles 25 and the storage box 21 adopt an integral structure.

[0029] As Figure 4 、 Figure 8 shown, a flow measurement device 24 is arranged at the discharge port of the storage box 21. The upper end of the flow measurement device 24 is connected to the discharge port of the storage box 21, and the lower end of the flow measurement device 24 is connected to the feed port of the feed hopper 4; the flow measurement device 24 includes an upper connecting pipe 241, an asphalt flow meter 242, a lower connecting pipe 243, and a control valve 244. The upper end of the upper connecting pipe 241 is connected to the discharge port of the storage box 21, the lower end of the upper connecting pipe 241 is connected to one end of the asphalt flow meter 242, the other end of the asphalt flow meter 242 is connected to the upper end of the lower connecting pipe 243, the lower end of the lower connecting pipe 243 is connected to the feed port of the colloid mill 5, and a control valve 244 is arranged on the lower connecting pipe 243.

[0030] The asphalt flow rate measuring instrument 242 includes a measuring pipe, a measuring base, a flow blocking member, a measuring rod, a capacitance force sensor, a preamplifier, an A / D converter, a microprocessor and a display device; the measuring pipe is vertically arranged between the upper connecting pipe 241 and the lower connecting pipe 243, and the measuring base is arranged on the side wall of the measuring pipe; the measuring rod is horizontally arranged, one end of the measuring rod is connected to the capacitance force sensor, the other end is a free end and is on the central axis of the measuring pipe, and the flow blocking member is installed above the free end of the measuring rod; the capacitance force sensor is installed on the measuring base, the output end of the capacitance force sensor is connected to the input end of the preamplifier, the output end of the preamplifier is connected to the input end of the A / D converter, the output end of the A / D converter is connected to the input end of the microprocessor, and the output end of the microprocessor is connected to the display device.

[0031] As Figures 5 - 6 shown, the controller 3 includes a power switch, a motor speed regulator, a temperature regulator, an ammeter and a temperature display; the power switch is connected to the power supply, and the ammeter is used to display the magnitude of the power supply current; the motor speed regulator is connected to the motor 12 and is used to adjust the motor speed; the temperature regulator is connected to the heating device 23 and is used to adjust the heating temperature of the heating device; the temperature display is connected to the output end of the temperature sensor 14 and is used to display the temperature of the matrix asphalt in the storage box body 21.

[0032] The present invention also explores the relationship between the outlet size of the asphalt storage tank 2 and the type and dosage of the matrix asphalt, as follows: First of all, the asphalt types in the present invention are mainly divided into: ordinary petroleum asphalt, high-viscosity asphalt and modified asphalt. The viscosities, shear sensitivities and fluidities of different asphalts are significantly different, as follows: 1) Ordinary petroleum asphalt (low viscosity, high fluidity): requires a smaller outlet (50 mm - 60 mm), and the flow rate is stabilized (200 kg / h - 500 kg / h) by restricting the cross-sectional area to avoid the out-of-control flow rate caused by self-weight flow.

[0033] 2) High-viscosity asphalt (viscosity > 10^5 mPa·s): requires a larger outlet (70 mm - 80 mm) to reduce the shear stress and prevent the flow channel blockage caused by viscous resistance.

[0034] 3) Modified asphalt (significant thixotropy): a medium-sized outlet (60 mm - 70 mm) balances the yield stress and flow recovery characteristics to adapt to the medium flow rate requirements of 150 kg / h - 400 kg / h.

[0035] Secondly, the outlet size will directly affect the flow heat loss of the asphalt, so it is necessary to carry out thermodynamic behavior regulation, as follows: 1) For small-diameter discharging (50 mm - 60 mm), by increasing the flow rate (for ordinary asphalt), the exposure time is shortened, convective heat dissipation is reduced, and the temperature drop rate is inhibited (ΔT < 2 °C / min).

[0036] 2) For large-diameter discharging (70 mm - 80 mm), the flow resistance of high-viscosity asphalt is reduced, avoiding frictional heat generation (temperature rise > 5 °C) caused by excessive pumping pressure and subsequent quenching effects.

[0037] Finally, establish the relationship between the discharging port and the flow rate ratio:

[0038] In the formula, is the maximum design flow rate (kg / h), and η is the rotational viscosity at 60 °C (Pa·s).

[0039] The upper limit of the discharging port diameter is set according to the critical Reynolds number of turbulent flow ( = 2100):

[0040] In the formula, is the upper limit of the discharging port diameter, is the Reynolds number, is the flow rate, is the flow velocity.

[0041] Ensure the laminar flow-dominated state and inhibit flow instability (pulsation < 3%).

[0042] Through the above parametric design, the corresponding relationship between the discharging port size of the asphalt storage tank 2 and the type and dosage of the base asphalt is shown in the following table;

[0043] By setting the temperature stability, flow continuity, and metering accuracy during the asphalt transportation process as above, the comprehensive efficiency of the system is increased by 19 - 35%.

[0044] A base asphalt adding device for emulsified asphalt preparation according to the present invention, compared with the method of manually pouring the base asphalt, first through the stirring action of the stirring device and the heating action of the heating device, the base asphalt can be kept warm and its temperature can be evenly distributed, preventing heat loss and temperature drop during the addition of the base asphalt, thereby ensuring the emulsification effect of the base asphalt; meanwhile, when adding the base asphalt, the flow rate of the base asphalt is measured by the asphalt flow rate measuring device, and the dosage of the base asphalt can be accurately controlled, thus ensuring the physical and chemical properties of the emulsified asphalt residue.

[0045] The following further explains the present invention.

[0046] As shown in the appendix Figures 1 - 8As shown, a base asphalt adding device for preparing emulsified asphalt according to the present invention comprises a stirring device 1, an asphalt storage tank 2, a controller 3 and a feeding funnel 4; the stirring device 1 is arranged at the upper end of the asphalt storage tank 2, and is used for stirring and monitoring the temperature of the base asphalt in the asphalt storage tank 2; the asphalt storage tank 2 is arranged above the feeding funnel 4, and the asphalt storage tank 2 is connected to the feeding funnel 4 and then connected to the colloid mill 5; the stirring device 1 and the asphalt storage tank 2 are both connected to the controller 3.

[0047] The stirring device 1 includes a cover plate 11, a motor 12, a stirring blade 13 and a temperature sensor 14. The cover plate 11 adopts a cylindrical structure. Three rectangular protrusions are arranged on the bottom edge of the cover plate 11 for matching and connecting with the asphalt storage box 2. The inside of the cover plate 11 is filled with thermal insulation asbestos to effectively improve the thermal insulation performance of the cover plate 11. The motor 12 is installed at the top center of the cover plate 11, and the motor 12 and the cover plate 11 are connected by bolts. A wire jack is arranged on the side of the motor 12 near the top, and it is connected to the controller 3 through a wire.

[0048] The output shaft of the motor 12 passes through the cover plate 11 and extends into the asphalt storage tank 2. The stirring blade 13 is installed on the output shaft of the motor 12. The stirring blade 13 adopts an "8"-shaped structure and is connected to the motor output shaft through a cylindrical connector. The temperature sensor 14 is located near the edge of the cover plate 11, passes through and is fixed to the cover plate 11, and is connected to the controller 3 through a wire.

[0049] The asphalt storage box 2 includes a storage box body 21, a support structure 22, a heating device 23, a flow measuring device 24 and a handle 25. The storage box body 21 adopts a cylindrical structure. Three rectangular grooves are arranged at the inner top of the storage box body 21. The rectangular grooves match with the rectangular protrusions on the cover plate 11, so that the cover plate 11 and the storage box body 21 are matched and connected; the heating device 23 is arranged on the bottom plate of the storage box body 21, and a wire jack is arranged near the bottom of the outer side of the storage box body 21. One end of the wire jack is connected to the heating device 23, and the other end is connected to the controller 3 through a wire; the heating device 23 adopts an electric heating wire, which is evenly arranged in a plane spiral shape in the bottom plate of the storage box body 21. A through circular hole is arranged in the center of the storage box body 21 as a discharge port; the shell of the storage box body 21 is filled with thermal insulation asbestos.

[0050] The support structure 22 is arranged at the bottom end of the storage box 21, and the upper end of the support structure 22 is fixed to the bottom end of the storage box 21. The support structure 22 includes three evenly arranged rectangular support columns, and the lower end of the rectangular support column is provided with a cylindrical groove, which is used in conjunction with the feeding funnel 4.

[0051] Preferably, the height of the support structure 22 is 15 cm to 20 cm, so that the distance between the discharge port of the storage box 21 and the feed hopper 4 is controlled within the range of 20 cm to 25 cm; Preferably, the lower groove of the support column 221 and the upper boss of the feed hopper 4 adopt an inclined surface plug-in design, which can ensure quick docking and reduce the heat dissipation when heat passes through the metal support column. In addition, a flange heat insulation sleeve can be added at each interface to reduce the contact thermal resistance and heat loss.

[0052] A flow measurement device 24 is provided at the discharge port of the storage box 21. The upper end of the flow measurement device 24 is connected to the discharge port of the storage box 21, and the lower end of the flow measurement device 24 is connected to the feed port of the feed hopper 4; the flow measurement device 24 includes an upper connecting pipe 241, an asphalt flow meter 242, a lower connecting pipe 243 and a control valve 244. The upper end of the upper connecting pipe 241 is fixedly connected to the discharge port of the storage box 21, the lower end of the upper connecting pipe 241 is connected to one end of the asphalt flow meter 242, the other end of the asphalt flow meter 242 is connected to the upper end of the lower connecting pipe 243, the lower end of the lower connecting pipe 243 is connected to the feed port of the colloid mill 5, and a control valve 244 is provided on the lower connecting pipe 243. The control valve 244 is a ball valve, and the ball valve is arranged at the lower end of the lower connecting pipe 243; the upper connecting pipe 241 and the asphalt flow meter 242, and the asphalt flow meter 242 and the lower connecting member 243 are all connected by bolts.

[0053] The asphalt flow meter 242 includes a measuring pipe, a measuring base, a flow blocking member, a measuring rod, a capacitance force sensor, a preamplifier, an A / D converter, a microprocessor and a display device; the measuring pipe is vertically arranged between the upper connecting pipe 241 and the lower connecting pipe 243, and the measuring base is arranged on the side wall of the measuring pipe; the measuring rod is horizontally arranged, one end of the measuring rod is connected to the capacitance force sensor, and the other end is a free end and is located on the central axis of the measuring pipe. The flow blocking member is installed above the free end of the measuring rod; the capacitance force sensor is installed on the measuring base, the output end of the capacitance force sensor is connected to the input end of the preamplifier, the output end of the preamplifier is connected to the input end of the A / D converter, the output end of the A / D converter is connected to the input end of the microprocessor, and the output end of the microprocessor is connected to the display device; the upper connecting pipe, the measuring pipe and the lower connecting pipe all adopt a cylindrical structure and are vertically coaxially arranged, and the inner diameters of the upper connecting pipe, the measuring pipe and the lower connecting pipe are the same; the asphalt flow meter uses a capacitance force sensor as a measuring and sensitive transmission element. When asphalt passes through the measuring pipe, the flow blocking member of the asphalt flow meter generates a pressure difference due to the kinetic energy of the asphalt itself and senses the acting force of the asphalt; the acting force sensed by the flow blocking member is transmitted to the capacitance force sensor through the measuring rod, and a voltage signal is output through the capacitance force sensor; after being processed by the preamplifier, the A / D converter and the microprocessor, the instantaneous flow rate and cumulative total amount of the asphalt are obtained.

[0054] The handle 25 is located at the outer side of the storage box body 21 near the top end. The handle 23 is fixed to the outer side of the storage box body 21, and two handles 25 are symmetrically arranged.

[0055] The controller 3 is provided with a power switch, a motor regulator, a temperature regulator, an ammeter and a temperature display; the motor 12 is electrically connected to the motor regulator in the controller 3, and the motor 12 is a DC motor; the motor regulator is an additional resistor connected in series with the motor rotor. When the motor regulator is rotated, the resistance connected in series with the motor rotor can be changed, thereby changing the circuit current and the speed of the motor. The speed regulation circuit diagram of the motor regulator is as shown in the appendix Figure 6 shown.

[0056] The temperature sensor 14 is electrically connected to the temperature display arranged in the controller 3 for real-time display of the temperature in the storage box body 21. The temperature sensor 14 is a contact type thermocouple sensor. When one end immersed in the matrix asphalt is heated, an electromotive force will be generated in the thermocouple circuit, and this electromotive force will be converted into a temperature value and displayed in real time on the temperature display.

[0057] The heating wire is electrically connected to the temperature regulator arranged in the controller 3. The temperature regulator is equivalent to a variable resistor connected in series in the circuit. By rotating the temperature regulator, the circuit current can be changed, thereby changing the heat generated by the heating wire, and further changing the temperature of the asphalt. The temperature regulation circuit diagram of the heating wire is as shown in the appendix Figure 7 shown.

[0058] When using the matrix asphalt adding device for preparing emulsified asphalt according to the present invention to prepare emulsified asphalt, the specific operation steps are as follows: 1. Melt the matrix asphalt in the oven and heat it to a preset temperature, then close the ball valve and turn on the power switch of the controller; 2. Pour the matrix asphalt into the storage box body. At this time, the temperature of the matrix asphalt will be lower than the preset temperature; then, rotate the motor regulator of the controller to turn on the motor and adjust it to an appropriate speed; and rotate the temperature regulator of the controller to turn on the heating device to heat the matrix asphalt; 3. Observe the temperature display of the controller during the heating process. When the temperature reaches the preset temperature, reverse-rotate the temperature regulator of the controller to turn off the electric heater, thereby stopping the heating; 4. Pour a certain amount and preset temperature of clean water into the feed hopper and turn on the colloid mill to circulate the water to preheat the colloid mill; 5. Turn off the colloid mill and drain the water. Immediately after draining the water, pour the designed amount of soap solution into the feed hopper; 6. After the soap solution is poured out, first start the colloid mill to circulate the soap solution, then hold the handle and place the stirring component and the matrix asphalt storage tank as a whole above the feeding funnel above the colloid mill, and open the ball valve to add the designed amount of matrix asphalt; 7. Hold the handle and remove the stirring device and the asphalt storage tank as a whole from the feeding funnel, and collect the prepared emulsified asphalt after the colloid mill circulates, and finally clean and close the colloid mill.

[0059] Example In this example, the provided matrix asphalt adding device is used to prepare matrix emulsified asphalt, and the raw material ratios for preparing matrix emulsified asphalt are shown in Table 1.

[0060] Table 1 Component ratios of matrix emulsified asphalt

[0061] According to the component ratios of matrix emulsified asphalt listed in Table 1, the following specific operation steps for preparing emulsified asphalt using the matrix asphalt adding device are followed to prepare matrix emulsified asphalt.

[0062] The preparation process is as follows: 1. Melt the matrix asphalt in the oven and heat it to about 140 °C, then close the ball valve and turn on the power switch of the controller; 2. Pour the matrix asphalt into the storage box, and at this time the temperature of the matrix asphalt will be lower than 140 °C; then, turn the motor regulator of the controller to start the motor and adjust it to an appropriate speed; and, turn the temperature regulator of the controller to start the heating device to heat the matrix asphalt; 3. Observe the temperature display of the controller during the heating process. When the temperature reaches 140 °C, reverse the temperature regulator of the controller to turn off the electric heater, thereby stopping the heating; 4. Pour a certain amount of clean water at 60 °C into the feeding funnel, and start the colloid mill to circulate the water to preheat the colloid mill; 5. Close the colloid mill and drain the water. Immediately after draining the water, pour the designed amount of soap solution into the feeding funnel; 6. After the soap solution is poured out, first start the colloid mill to circulate the soap solution for about 5 - 10 seconds, then hold the handle and place the stirring component and the matrix asphalt storage tank as a whole above the feeding funnel above the colloid mill, and open the ball valve to add the designed amount of matrix asphalt; 7. Hold the handle and remove the stirring device and the asphalt storage tank as a whole from the feeding funnel, and collect the prepared emulsified asphalt after the colloid mill circulates for 10 - 15 seconds, and finally clean and close the colloid mill.

[0063] Comparative example In this comparative example, matrix emulsified asphalt was prepared by the method of ordinary manual pouring of matrix asphalt. The raw material ratio for preparing the matrix emulsified asphalt was the same as that in the example. First, the matrix asphalt was melted and heated to about 140 °C in an oven. Then, according to operation steps 4 and 5 for preparing emulsified asphalt using the matrix asphalt addition device above, the colloid mill was preheated and the designed amount of soap solution was added. Finally, the matrix asphalt was manually poured, and after the colloid mill circulated for 10 - 15 seconds, the prepared emulsified asphalt was collected. After the preparation of the emulsified asphalt was completed, the colloid mill was cleaned and shut down.

[0064] Test results Both the examples and comparative examples of the present invention were carried out six times, that is, six repeated tests. According to the "Test Procedures for Bitumen and Bituminous Mixtures for Highway Engineering" JTG E20 - 2011, the self - performance of the emulsified asphalt prepared in the examples and comparative examples and the road - using performance of its residues were tested; the test results are shown in Tables 2 and 3.

[0065] Table 2 Performance indicators of the matrix emulsified asphalt in the examples

[0066] Table 3 Performance indicators of the matrix emulsified asphalt in the comparative example

[0067] Comparing Table 2 and Table 3, compared with manual pouring of matrix asphalt, the over - sieve residue of the emulsified asphalt prepared using the matrix asphalt addition device is generally smaller, and the 1 - day and 5 - day storage stabilities are generally better. Moreover, the coefficient of variation of the self - performance and road - using performance indicators of the evaporation residue of the emulsified asphalt prepared using the matrix asphalt addition device is smaller, indicating that the self - performance of the emulsified asphalt prepared using the matrix asphalt addition device is better, and the self - performance and the performance of the evaporation residue are more stable with less variability. In summary, preparing emulsified asphalt using the matrix asphalt addition device can overcome the deficiencies of ordinary manual pouring of matrix asphalt, effectively improve the self - performance of emulsified asphalt, and reduce the variability of the self - performance and road - using performance of itself and its residues.

[0068] The optional implementation manners of the embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above - mentioned implementation manners. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention. In addition, it should be noted that, in the various specific technical features described in the above - mentioned specific implementation manners, they can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not separately describe various possible combination manners.

Claims

1. A base asphalt adding device for preparing emulsified asphalt, characterized in that: The invention comprises a stirring device (1), an asphalt storage tank (2) and a controller (3); the stirring device (1) is arranged on the upper part of the asphalt storage tank (2), and the output end of the stirring device (1) extends into the asphalt storage tank (2); The asphalt storage box (2) comprises a storage box body (21), a heating device (23) and a flow measuring device (24); the storage box body (21) is used to store base asphalt, and the bottom plate of the storage box body (21) is provided with a heating device (23); a discharge port is provided at the bottom center of the storage box body (21), and a flow measuring device (24) is provided at the discharge port of the storage box body (21); the upper end of the flow measuring device (24) is connected to the discharge port of the storage box body (21), and the lower end is connected to the feed port of the colloid mill (5); the stirring device (1) and the heating device (23) are both connected to the controller (3).

2. A base asphalt adding device for preparing emulsified asphalt according to claim 1, characterized in that: The stirring device (1) is capable of steplessly regulating the speed at 200 rpm to 600 rpm. The stirring device (1) comprises a cover plate (11), a motor (12) and a stirring blade (13). The cover plate (11) is mounted on the upper end of a storage box (21). The motor (12) is mounted above the cover plate (11). The output end of the motor (12) is arranged through the center of the cover plate (11). The stirring blade (13) is arranged in the storage box (21). The stirring blade (13) is connected to the output end of the motor (12). The motor (12) is electrically connected to a controller (3).

3. A base asphalt adding device for preparing emulsified asphalt according to claim 1, characterized in that: The stirring device (1) is provided with a temperature sensor (14), which is arranged radially along the stirring shaft, with a detection end extending to the center of the stirring chamber, and is configured to monitor the process temperature range of 120°C to 180°C in real time; the detection end of the temperature sensor (14) extends into the storage box (21), and the signal output end of the temperature sensor (14) is electrically connected to the controller (3).

4. A base asphalt adding device for preparing emulsified asphalt according to claim 1, characterized in that: The operating temperature range of the asphalt storage box (2) is 135°C to 165°C; the axial temperature difference in the storage box (21) is ≤5°C, and the radial temperature difference is ≤3°C; the outlet size of the storage box (21) is determined according to the asphalt flow rate and the critical Reynolds number of turbulence: Relationship between discharge port and flow ratio: In the formula, is the maximum design flow rate, η is the rotational viscosity at 60°C; The upper limit of the discharge port diameter is set according to the critical Reynolds number of turbulence: In the formula, is the upper limit of the discharge port diameter, is the Reynolds number, For flow, is the flow rate.

5. A base asphalt adding device for preparing emulsified asphalt according to claim 1, characterized in that: A support structure (22) is arranged at the bottom of the storage box (21), and the height of the support structure (22) is 15 cm to 20 cm; the upper end of the support structure (22) is fixedly connected to the storage box (21), and the lower end of the support structure (22) is detachably connected to the top of the feed inlet of the colloid mill (5).

6. A base asphalt adding device for preparing emulsified asphalt according to claim 1, characterized in that: It also includes a feed funnel (4), which is arranged between the flow measuring device (24) and the colloid mill (5); the feed port of the feed funnel (4) is connected to the lower end of the flow measuring device (24), and the discharge port of the feed funnel (4) is connected to the feed port of the colloid mill (5); and the lower end of the support structure (22) is detachably connected to the top of the feed funnel (4).

7. A base asphalt adding device for preparing emulsified asphalt according to claim 1, characterized in that: The heating device (23) uses an electric heating wire, which is evenly arranged in a planar spiral shape in the bottom plate of the storage box (21), and is electrically connected to the controller (3); the surface power density of the electric heating wire is 30W / cm²~50W / cm², and the temperature control accuracy is ±1.5°C.

8. A base asphalt adding device for preparing emulsified asphalt according to claim 1, characterized in that: The flow measuring device (24) comprises an upper connecting pipe (241), an asphalt flow measuring instrument (242), a lower connecting pipe (243) and a control valve (244); the upper end of the upper connecting pipe (241) is connected to the discharge port of the storage box (21); the lower end of the upper connecting pipe (241) is connected to one end of the asphalt flow measuring instrument (242); the other end of the asphalt flow measuring instrument (242) is connected to the upper end of the lower connecting pipe (243); the lower end of the lower connecting pipe (243) is connected to the feed port of the colloid mill (5); and the control valve (244) is arranged on the lower connecting pipe (243).

9. A base asphalt adding device for preparing emulsified asphalt according to claim 8, characterized in that: The asphalt flow meter (242) comprises a measuring tube, a measuring base, a flow blocker, a measuring rod, a capacitive force sensor, a preamplifier, an A / D converter, a microprocessor and a display device; the measuring tube is vertically arranged between an upper connecting tube (241) and a lower connecting tube (243), and the measuring base is arranged on the side wall of the measuring tube; the measuring rod is horizontally arranged in the measuring base, one end of the measuring rod is connected to the capacitive force sensor, and the other end is a free end and is located on the central axis of the measuring tube, and the flow blocker is installed on the upper part of the free end of the measuring rod; the capacitive force sensor is installed on the measuring base, the output end of the capacitive force sensor is connected to the input end of the preamplifier, the output end of the preamplifier is connected to the input end of the A / D converter, the output end of the A / D converter is connected to the input end of the microprocessor, and the output end of the microprocessor is connected to the display device.

10. A base asphalt adding device for preparing emulsified asphalt according to claim 1, characterized in that: The controller (3) comprises a motor speed regulator and a temperature regulator; the motor speed regulator is electrically connected to the stirring device (1), and the temperature regulator is electrically connected to the heating device (21).

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