Asphalt anti-stripping agent adding device

Abstract

The invention relates to an asphalt anti-stripping agent adding device. The device comprises an anti-stripping agent storage tank, a metering module, a mixing module and a control module. The anti-stripping agent storage tank comprises a heating element, a temperature measuring element, a first liquid level sensor, a second liquid level sensor and a metal tank body; the metering module comprises a basket filter, a buffer tank, a variable-frequency screw pump and a mass flow meter, a second control valve is arranged at an outlet of the mass flow meter, and a backflow pipeline capable of enabling an anti-stripping agent to flow back to the buffer tank is arranged at the outlet of the mass flow meter; the mixing module comprises a mixer connected with the third connecting pipe, a distance rod mounted on the inner wall of the mixer, and a mixing baffle mounted on the distance rod through a mounting hole; the control module comprises a control unit, a signal acquisition unit, an instruction output unit and a man-machine interaction unit. The device realizes accurate adding and mixing of the anti-stripping agent.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of asphalt processing equipment, and particularly relates to an asphalt anti-stripping agent adding device. BACKGROUND

[0002] In the production process of asphalt mixture, an anti-stripping agent is usually added to the asphalt to enhance the adhesion between the asphalt and aggregate. Traditional anti-stripping agent adding methods, such as pump circulation stirring method and forced stirring method, have the disadvantages of complicated operation, long stirring time, the need for preparing a mixed solution in advance, large equipment footprint, and the like, and are difficult to adapt to the continuous and efficient production rhythm of modern mixing stations.

[0003] As an online adding method that can realize synchronous addition of the anti-stripping agent and the asphalt, the branch pipe blending method is more suitable for continuous production in theory. Existing technical solutions are mostly improvements around this method. For example, the patent "Anti-stripping agent branch pipe blending adding device" (CN212670200U) discloses an adding device using an injection cylinder and a cylinder power mechanism. The anti-stripping agent is quantitatively extracted and injected through the reciprocating movement of a piston, and the on-off of the pipeline is controlled by the inlet and outlet valves. This solution can realize on-demand addition, but the accuracy is easily affected by equipment wear and fluid viscosity, and the reliability and accuracy maintenance of the pneumatic system in a long-term high-dust operating environment are challenging.

[0004] In addition, in the patent "Asphalt anti-stripping agent automatic adding device" (CN114931890A), a weighing type metering tank is used for batch quantitative addition. This method can improve the accuracy of the single addition amount, but its working mode is intermittent, and it cannot realize truly synchronized and continuous online addition and instantaneous proportional adjustment with the asphalt flow. The addition process has a lag, and it is difficult to meet the high requirements of the mixing station for production continuity and consistency of the mix proportion.

[0005] In summary, the asphalt anti-stripping agent adding devices in the prior art have different degrees of deficiencies in terms of measurement accuracy, automation control level, system integration, and response speed. Therefore, there is an urgent need for a new adding device that can integrate high-precision measurement, continuous online addition, automatic temperature control, and intelligent proportional adjustment with the main control system. SUMMARY

[0006] The purpose of the present application is to provide an asphalt anti-stripping agent adding device to solve the problems raised in the background art.

[0007] To achieve the above purpose, the present application provides the following technical solution: an asphalt anti-stripping agent adding device, which is composed of an anti-stripping agent storage tank, a metering module, a mixing module, and a control module, wherein:

[0008] The anti-stripping agent storage tank comprises a metal tank body, a heating element arranged on the metal tank body, a temperature measuring element arranged in the metal tank body, a first liquid level sensor and a second liquid level sensor arranged on the metal tank body, and a breather valve arranged on the metal tank body.

[0009] The metering module comprises a basket filter connected with the metal tank body through a first connecting pipe, a buffer tank connected with the basket filter through a second connecting pipe, a floating ball type exhaust valve arranged on the buffer tank, a variable frequency screw pump installed at the bottom of the buffer tank and driven by a frequency converter, a mass flow meter installed at the outlet of the variable frequency screw pump, a second control valve arranged at the outlet of the mass flow meter, a third connecting pipe installed at the second control valve, and a backflow pipe connected at one end to the third connecting pipe and at the other end to the inlet of the buffer tank, and the backflow pipe is provided with a third control valve.

[0010] The mixing module comprises a mixer connected with the third connecting pipe, a distance rod installed on the inner wall of the mixer, a plurality of mounting holes arranged on the distance rod, a mixing baffle installed on the distance rod through the mounting holes and staggered in a manner that adjacent units are rotated by 90°, a plurality of first through holes and second through holes arranged on the mixing baffle, an inlet pipe installed at the inlet of the mixer, and an outlet pipe installed at the outlet of the mixer.

[0011] The control module comprises a control unit, a signal acquisition unit, an instruction output unit, and a man-machine interaction unit, the signal acquisition unit can receive electrical signals from the first liquid level sensor, the second liquid level sensor, the temperature measuring element, and the mass flow meter, the instruction output unit can issue control instructions to the frequency converter, the second control valve, and the third control valve, and the man-machine interaction unit can display system status, set process parameters, and perform manual operation.

[0012] As a preferred scheme of the present application, the control logic of the control unit is as follows,

[0013] The control unit is configured to issue a high liquid level alarm when receiving the signal of the first liquid level sensor, and issue a low liquid level alarm and execute a shutdown instruction when receiving the signal of the second liquid level sensor.

[0014] The control unit is configured to receive the signal of the temperature measuring element and control the working state of the heating element.

[0015] The control unit is configured to receive the asphalt flow signal sent by the asphalt supply tank and the set addition ratio, calculate the target addition flow, receive the actual flow signal fed back by the mass flow meter, and compare with the target flow, according to the comparison result, output an analog signal to the frequency converter, and steplessly adjust the rotating speed of the variable frequency screw pump.

[0016] The control unit is configured to control the variable frequency screw pump to work at a higher rotating speed when the required addition flow is lower than the lower limit of stable work of the variable frequency screw pump, and adjust the opening of the third control valve at the same time to make part of the fluid backflow, when the system pressure abnormally rises, automatically increase the opening of the third control valve to relieve pressure and backflow, if the pressure continuously rises too high, close the second control valve and stop the variable frequency screw pump.

[0017] As a preferred scheme of the present application, the control unit is further provided with a communication interface for data exchange with the main control system of the asphalt mixing station, receiving start-stop commands and asphalt flow data, and uploading the running state and alarm information of the system.

[0018] As a preferred scheme of the present application, the first liquid level sensor is used to detect the highest liquid level inside the metal tank body, and the second liquid level sensor is used to detect the lowest liquid level inside the metal tank body.

[0019] As a preferred scheme of the present application, the first connecting pipe is a hose.

[0020] As a preferred scheme of the present application, the first connecting pipe is provided with a first control valve at the top.

[0021] As a preferred scheme of the present application, the mixing baffle is a circular plate.

[0022] As a preferred scheme of the present application, the first through hole is circular and is arranged in the central area of the mixing baffle, and the second through hole is fan-shaped and is arranged in the outer edge area of the mixing baffle.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] The device realizes closed-loop control through the metering module composed of the mass flow meter and the variable frequency screw pump. The mass flow meter directly measures the mass flow of the fluid, and its measurement result is not affected by the changes of fluid temperature and density; the frequency converter adjusts the rotating speed of the screw pump in real time according to the flow feedback signal, so as to realize accurate and stable control of the addition amount of anti-stripping agent.

[0025] The core control module of the device is integrated with a control unit, a signal acquisition unit and an instruction output unit. The system can automatically perform a series of operations such as tank heating and heat preservation, liquid level monitoring, pump start and stop and speed regulation, and can receive the asphalt flow signal of the external main system, realize automatic synchronization and proportional regulation of the anti-stripping agent addition amount and the asphalt flow, and reduce manual intervention.

[0026] The online continuous working mode of the device enables the metering and adding process of the anti-stripping agent to be synchronized with the asphalt conveying process, realizes real-time proportional addition without lag, and is beneficial to guarantee the instantaneous consistency and overall stability of the asphalt mixture mixing ratio. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present application.

[0028] Figure 2 It is a schematic diagram of the internal structure of the mixer of the present application.

[0029] Wherein: 101, metal tank body, 102, heating element, 103, temperature measuring element, 104, first liquid level sensor, 105, second liquid level sensor, 106, breather valve, 107, feed inlet, 201, first control valve, 202, first connecting pipe, 203, basket filter, 204, second connecting pipe, 205, buffer tank, 206, floating ball type exhaust valve, 207, variable frequency screw pump, 208, mass flowmeter, 209, second control valve, 210, third connecting pipe, 211, backflow pipe, 212, third control valve, 301, mixer, 302, distance rod, 303, mixing baffle, 304, first through hole, 305, second through hole, 306, inlet pipe, 307, outlet pipe. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] A specific embodiment of the present application is: an asphalt anti-stripping agent adding device, which is installed between the asphalt supply unit and the asphalt mixing unit in the asphalt mixing building, is used for adding anti-stripping agent to the asphalt flow output by the asphalt supply unit, and fully mixes the anti-stripping agent with the asphalt flow, and then outputs to the asphalt mixing unit for next step of mixing processing. The device is composed of an anti-stripping agent storage tank, a metering module, a mixing module and a control module.

[0032] The anti-stripping agent storage tank comprises the following structure: a metal tank body 101, a heating element 102 for heating the tank body is arranged in the bottom and the sidewall of the metal tank body 101, and a temperature measuring element 103 is arranged inside the metal tank body 101; a first liquid level sensor 104 is arranged on the upper part of the metal tank body 101, and a second liquid level sensor 105 is arranged on the lower part of the metal tank body 101, the first liquid level sensor 104 and the second liquid level sensor 105 are respectively used for detecting the highest liquid level and the lowest liquid level inside the metal tank body 101; a breather valve 106 is arranged on the upper part of the metal tank body 101, when the agent in the tank is pumped to cause the pressure in the tank to be higher than the set value, the positive pressure valve disc of the breather valve 106 is opened to safely discharge the excessive gas, so as to prevent the deformation or damage of the storage tank due to overpressure, when the agent in the tank is pumped to cause the pressure in the tank to be lower than the set value, the vacuum valve disc of the breather valve 106 is opened to inhale external gas.

[0033] The metering module comprises the following structure: a basket filter 203, which is communicated with the bottom of the metal tank body 101 through a first connecting pipe 202, the first connecting pipe 202 is a hose, and a first control valve 201 is arranged on the top of the first connecting pipe 202, the first control valve 201 is a manual valve, which is used for manually closing the inlet during maintenance or cleaning; a buffer tank 205, which is communicated with the outlet of the basket filter 203 through a second connecting pipe 204, a floating ball type exhaust valve 206 is arranged on the top of the buffer tank 205, which can be automatically opened to balance the internal and external air pressure when the internal air pressure of the buffer tank 205 is too large; a variable frequency screw pump 207, which is installed at the bottom of the buffer tank 205 and is driven by a frequency converter, the output frequency of the frequency converter is controlled through a PLC analog signal, so that the rotating speed and the output flow of the variable frequency screw pump 207 are steplessly adjusted; a mass flow meter 208, which is installed at the outlet of the variable frequency screw pump 207, the measurement result of the mass flow meter 208 is transmitted to a PLC controller through an electric signal, and a second control valve 209 is arranged at the outlet of the mass flow meter 208, the second control valve 209 is an electric valve and is controlled by the PLC controller, which is used for cutting off the fluid in emergency shutdown and when the addition amount is reached; a third connecting pipe 210, which is installed at the second control valve 209 and is used for connecting the metering module and the mixing module; a backflow pipe 211, one end of which is connected to the third connecting pipe 210, and the other end is connected to the inlet of the buffer tank 205, and a third control valve 212 is arranged on the backflow pipe 211, the third control valve 212 is an electric valve, which is controlled by the PLC to open, so that the anti-stripping agent flows back to the buffer tank 205 when the downstream is blocked and overpressured, thereby preventing the metering module from being damaged due to excessive pressure, and when the anti-stripping agent with small flow needs to be added, the third control valve 212 is controlled to open, so that part of the anti-stripping agent flows back to the buffer tank, thereby realizing the fine adjustment of the addition flow of the anti-stripping agent.

[0034] The mixing module comprises the following structures: a mixer 301 connected with the third connecting pipe 210 for mixing the anti-stripping agent and the asphalt flow; four distance rods 302 equidistantly installed on the inner wall of the mixer 301, and a plurality of mounting holes are arranged on the distance rods 302; a plurality of mixing baffles 303, which are circular plate members, are installed on the distance rods 302 through the mounting holes and are staggered and arranged in a manner that adjacent units are rotated by 90°, and a plurality of first through holes 304 and second through holes 305 are arranged on the mixing baffles 303, the first through holes 304 are circular and arranged in the central region of the mixing baffles 303, and the second through holes 305 are fan-shaped and uniformly distributed along the circumference of the mixing baffles 303; an inlet pipe 306 installed at the inlet of the mixer 301 for inputting the asphalt flow in the asphalt supply unit into the mixer 301; and an outlet pipe 307 installed at the outlet of the mixer 301 for inputting the mixed asphalt flow into the asphalt mixing tank.

[0035] The control module comprises the following structures: a control unit, which is a modular PLC controller and serves as the control core of the system; a signal acquisition unit, which is an analog input module of the PLC and is electrically connected with the control unit and used for receiving electrical signals from the first liquid level sensor 104, the second liquid level sensor 105, the temperature measuring element 103 and the mass flow meter 208; an instruction output unit, which is a digital output module of the PLC and is electrically connected with the control unit and used for issuing control instructions to the frequency converter, the second control valve 209 and the third control valve 212; and a man-machine interaction unit, which is electrically connected with the control unit and used for displaying the system state, setting the process parameters and performing manual operation.

[0036] The control logic of the control unit is as follows:

[0037] Liquid level monitoring logic: the control unit is configured to issue a high liquid level alarm when receiving the signal of the first liquid level sensor 104 and issue a low liquid level alarm and execute a shutdown instruction when receiving the signal of the second liquid level sensor 105.

[0038] Temperature control logic: the control unit is configured to receive the signal of the temperature measuring element 103 and maintain the temperature of the anti-stripping agent in a preset range by controlling the working state of the heating element 102.

[0039] Flow control logic: the control unit is configured to receive the asphalt flow signal sent by the asphalt supply tank and the set addition ratio, calculate the target addition flow; receive the actual flow signal fed back by the mass flow meter 208, and compare it with the target flow; according to the comparison result, output an analog signal to the frequency converter, steplessly adjust the rotating speed of the variable frequency screw pump 207, so that the actual flow dynamically tracks the target flow, forming a closed loop control circuit.

[0040] Flow fine adjustment and safety protection logic: the control unit is configured to control the variable frequency screw pump 207 to work at a higher rotating speed when the required addition flow is lower than the lower limit of stable work of the variable frequency screw pump 207, and at the same time adjust the opening degree of the third control valve 212 to make part of the fluid return, so as to realize fine adjustment of the downstream flow. When the system pressure abnormally rises, the opening degree of the third control valve is automatically increased for pressure relief return; if the pressure continues to be too high, the second control valve 209 is closed and the variable frequency screw pump 207 is stopped, playing a safety protection role.

[0041] Communication interface: the control unit is also provided with a communication interface for data exchange with the main control system of the asphalt mixing station, receiving start and stop commands and asphalt flow data, and uploading the running state and alarm information of the system.

[0042] In this embodiment, the asphalt anti-stripping agent adding device disclosed in the patent is manufactured and used in the following way:

[0043] The metal tank body 101 is made of stainless steel plate by rolling and welding, and a standard flange interface is arranged at the top center of the tank body as a feeding port 107. On one side of the feeding port 107, a round hole is opened using a hole opener, and a stainless steel threaded seat with internal threads is welded at the hole, and a composite breather valve 106 is installed on the stainless steel threaded seat. Electric heating wire is used as the heating element 102, which is tightly attached and tied on the outer wall and flat bottom of the tank body in a coiled manner, and then wrapped with a thermal insulation layer and a stainless steel outer protective shell. A stainless steel sleeve with internal threads is welded on the side wall of the metal tank body 101 near the top and the bottom, respectively, and a drop-in type liquid level sensor is put into the feeding port 107, and the high point sensing head and the low point sensing head are fixed at the corresponding tank depth positions of the two sleeves, respectively. A stainless steel sleeve is welded at the center of the tank bottom, and a temperature measuring element 103 is installed in the sleeve and fixed using a compression nut.

[0044] A stainless steel flange is welded to the bottom outlet of the metal tank 101, and a manual ball valve is connected to the tank through the flange. One end of a metal hose is connected to the flange at the outlet of the manual ball valve, and the other end of the metal hose is connected to the inlet flange of a basket filter 203. The outlet of the filter is connected to the inlet flange of a buffer tank 205 through a short stainless steel pipe. A float ball type automatic exhaust valve is installed on the top of the buffer tank 205.

[0045] A single screw pump is installed on the outlet flange at the bottom of the buffer tank 205. The outlet of the pump is connected to a mass flow meter 208 through a flange. An electric ball valve is installed at the outlet of the mass flow meter 208 as a second control valve 209. The outlet of the valve is divided into two paths through a three-way pipe fitting: one path is the main path, which leads to the mixing module through a stainless steel hard pipe; the other path is the return path, which is connected to a stainless steel return pipe 211. An electric regulating valve is installed on the return pipe 211 as a third control valve 212, and the other end of the return pipe 211 is connected to the inlet on the upper side wall of the buffer tank 205.

[0046] A section of seamless steel pipe is cut as a mixer 301. Inside it, four stainless steel distance bars are welded at 90° intervals in the circumferential direction, and a set of mounting holes are drilled on the distance bars every 150 mm. A plurality of circular mixing baffles 303 with an outer diameter slightly smaller than the inner diameter of the mixer 301 are processed. Two circular first through holes 304 are formed at the same distance from the center on each baffle. A plurality of second through holes 305 in the form of sectors are uniformly distributed around the central hole in the circumferential direction. The baffles are sequentially inserted into the four distance bars 302, with the distance between adjacent baffles being the same as the distance between the mounting holes, i.e. 150 mm, and are fixed through the mounting holes on the distance bars 302 and elastic retaining rings. It is ensured that the first through holes 304 of adjacent two baffles are rotated by 90° with respect to each other, so that the first through holes 304 of adjacent two baffles are not on the same vertical line.

[0047] The mixer 301 is vertically supported and fixed. Its asphalt inlet pipe 306 is connected to the upstream equipment through a flange. A threaded joint is formed on the inlet pipe 306 near the inlet of the mixer 301, and the third connecting pipe 210 from the metering module is connected through the threaded joint, so that the anti-stripping agent is injected into the asphalt flow. The outlet pipe 307 of the mixer 301 directly leads to the mixing tank.

[0048] A modular PLC is used as the control unit, and corresponding analog input module and digital output module are configured. The PLC is installed in the control cabinet together with the frequency converter, circuit breaker, relay, etc. The three-wire signal of the heating element 102, the electrical signals of the two liquid level sensors, the flow signal and the pulse total signal of the mass flow meter 208 are connected to the designated channels of the PLC analog input module, respectively. One channel of the PLC analog output module is connected to the analog input terminal of the frequency converter for controlling the pump speed. The digital output points of the PLC are connected to the power supply circuit of the second control valve 209 and the third control valve 212, respectively, to realize the opening and closing of the valves by controlling the on-off of the control circuit. An AC contactor is connected in series with the power supply circuit of the heating wire, and the coil of the contactor is controlled by another digital output point of the PLC. A touch screen is connected to the port of the control unit through a network cable to complete the configuration programming.

[0049] During the operation of the device, the PLC is first started for self-checking, and the self-checking result is displayed on the touch screen. The control unit reads the temperature of the anti-stripping agent in the tank in real time through the temperature measuring element 103. If the temperature is lower than the preset value, the PLC immediately drives the AC contactor to attract and supply power to the heating element 102 to start heating. The "heating" indicator on the touch screen is lit. When the temperature rises to the set value, the PLC controls the contactor to be disconnected to stop heating. Thereafter, the system continuously monitors the temperature and turns on or off the heating again when the temperature fluctuation exceeds the dead zone range, forming a simple ON / OFF temperature control loop to ensure that the anti-stripping agent is always in a liquid state with optimal fluidity.

[0050] During the standby period, the PLC continuously monitors the signals of the two liquid level sensors. When the liquid level in the tank is in the normal range, the system remains silent. This state continues until a start command is received. When the asphalt mixing station main system is ready for production, the main control system of the asphalt mixing building sends a "start" digital signal to the PLC control unit of the device and simultaneously sends an analog signal representing the current asphalt flow rate.

[0051] After receiving the instruction and the asphalt flow signal, the PLC of the device calculates according to the addition ratio set by the operator on the touch screen in advance: target addition flow = asphalt instantaneous flow x addition ratio. The PLC first issues an "open" instruction to the driver of the second control valve 209, and the valve is fully opened. At the same time, the PLC writes an initial value corresponding to the target flow to its analog output module according to the calculated target flow, and the signal is transmitted to the frequency converter, which drives the motor of the single screw pump to smoothly accelerate from 0 to an initial speed. The anti-stripping agent is pumped out and flows through the mass flow meter 208. The flow meter measures the real mass flow of the fluid in real time and converts it into an analog signal to continuously feedback to the analog input module of the PLC.

[0052] The PLC compares the actual flow signal received with the target flow signal, and calculates the deviation. The control algorithm built in the PLC dynamically adjusts the analog signal value sent to the frequency converter according to the deviation, so as to increase the rotational speed of the pump and the output flow. This process is repeated continuously, forming a closed loop control circuit, so that the actual flow quickly and stably approaches the target flow. The status of the entire process and the real-time flow curve are displayed on the touch screen for monitoring.

[0053] If the asphalt flow decreases, resulting in a target addition flow lower than the lower limit of the stable operation of the screw pump, the PLC will adopt a composite adjustment strategy. It first sets the frequency converter output at a higher, stable rotational speed, and then simultaneously controls the third control valve 212 to open a specific opening. This allows a portion of the fluid to return to the buffer tank 205 through the return pipeline 211, accurately controlling the actual downstream addition flow. The PLC continuously fine-tunes the opening of the third control valve 212 by monitoring the feedback of the mass flow meter 208, achieving fine control of the flow.

[0054] If the downstream pipeline or mixer 301 is blocked due to an accident, the system pressure will suddenly rise. At this time, the mass flow meter 208 and the pump's own pressure sensor will detect an abnormally high pressure signal. After receiving this signal, the PLC will execute the safety logic first: immediately increase the opening of the third control valve 212 to 100%, for full-flow pressure relief return. If the pressure does not return to normal in a short period of time, the PLC will close the second control valve 209 and stop the variable frequency pump, triggering a "high pressure alarm" on the touch screen, thereby protecting the pump and pipeline system from damage.

[0055] The anti-stripping agent meets the high-temperature asphalt from the asphalt supply unit at the inlet pipeline 306 and is initially mixed. This mixed fluid enters the mixer 301 at a certain flow rate. When the fluid flows through the mixed baffle 303 with staggered arrangement, central circular holes and fan-shaped holes, the flow path is continuously divided and combined, achieving dispersion and mixing of the anti-stripping agent and asphalt in the mixer 301, forming a uniform mixture, which is finally discharged to the mixing drum through the outlet pipeline 307.

[0056] When the main control system sends a "stop" command, or the asphalt supply of the mixing plant stops, the PLC of the device executes the shutdown program in sequence: stop the frequency converter output, the pump slows down to a stop; close the second control valve 209; close the third control valve 212. The system returns to standby state, only retaining the temperature control function. During operation, if the liquid level in the tank drops to trigger the low liquid level sensor, the PLC will immediately execute the above-mentioned emergency shutdown program, and issue an "anti-stripping agent low liquid level" audible and visual alarm on the touch screen, preventing the pump from running empty and being damaged.

[0057] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. An asphalt anti-stripping agent adding device characterized by comprising: It is composed of anti-stripping agent storage tank, metering module, mixing module and control module, wherein: The anti-stripping agent storage tank comprises a metal tank body (101), a heating element (102) is arranged on the top of the metal tank body (101), a temperature measuring element (103) is arranged in the metal tank body (101), a first liquid level sensor (104) and a second liquid level sensor (105) are arranged on the metal tank body (101), and a breather valve (106) is arranged on the metal tank body (101); The metering module comprises a basket filter (203) connected with the metal tank body (101) through a first connecting pipe (202), a buffer tank (205) connected with the basket filter (203) through a second connecting pipe (204), a floating ball type exhaust valve (206) arranged on the buffer tank (205), a variable frequency screw pump (207) installed at the bottom of the buffer tank (205) and driven by a frequency converter, a mass flow meter (208) installed at the outlet of the variable frequency screw pump (207), a second control valve (209) arranged at the outlet of the mass flow meter (208), a third connecting pipe (210) installed at the second control valve (209), and a backflow pipe (211) connected to the third connecting pipe (210) at one end and connected to the inlet of the buffer tank (205) at the other end, wherein a third control valve (212) is arranged on the backflow pipe (211); The mixing module comprises a mixer (301) connected with the third connecting pipe (210), a fixed distance rod (302) installed on the inner wall of the mixer (301), a plurality of mounting holes arranged on the fixed distance rod (302), a mixing baffle (303) installed on the fixed distance rod (302) through the mounting holes and staggered arranged in a manner of rotating (90)° of adjacent units, a plurality of first through holes (304) and second through holes (305) arranged on the mixing baffle (303), an inlet pipe (306) installed at the inlet of the mixer (301), and an outlet pipe (307) installed at the outlet of the mixer (301); The control module comprises a control unit, a signal acquisition unit, an instruction output unit and a man-machine interaction unit, the signal acquisition unit can receive electrical signals from the first liquid level sensor (104), the second liquid level sensor (105), the temperature measuring element (103) and the mass flow meter (208), the instruction output unit can send control instructions to the frequency converter, the second control valve (209) and the third control valve (212), and the man-machine interaction unit can display system status, set process parameters and perform manual operation.

2. The asphalt anti-stripping agent adding device according to claim 1, characterized in that: The control logic of the control unit is as follows, The control unit is configured to send a high liquid level alarm when receiving the signal of the first liquid level sensor (104) and send a low liquid level alarm and execute a shutdown instruction when receiving the signal of the second liquid level sensor (105); The control unit is configured to receive the signal of the temperature measuring element (103) and control the working state of the heating element (102); The control unit is configured to receive the asphalt flow signal sent by the asphalt supply tank and the set addition ratio, calculate the target addition flow, receive the actual flow signal fed back by the mass flow meter (208) and compare it with the target flow, output an analog signal to the frequency converter according to the comparison result, and steplessly adjust the rotating speed of the variable frequency screw pump (207); The control unit is configured to control the variable frequency screw pump (207) to work at a higher rotating speed and adjust the opening of the third control valve (212) to make part of the fluid backflow when the required addition flow is lower than the lower limit of the stable working state of the variable frequency screw pump (207), automatically increase the opening of the third control valve (212) to relieve pressure and backflow when the system pressure abnormally rises, and close the second control valve (209) and stop the variable frequency screw pump (207) if the pressure continuously exceeds the high limit.

3. The asphalt anti-stripping agent adding device according to claim 1, characterized in that: The control unit is also provided with a communication interface for data exchange with the main control system of the asphalt mixing station, receiving start and stop commands and asphalt flow data, and uploading the running state and alarm information of the system.

4. The asphalt anti-stripping agent adding device according to claim 1, characterized in that: The first liquid level sensor (104) is used to detect the highest liquid level inside the metal tank body (101), and the second liquid level sensor (105) is used to detect the lowest liquid level inside the metal tank body (101).

5. The asphalt anti-stripping agent adding device according to claim 1, characterized in that: The first connecting pipe (202) is a flexible pipe.

6. The asphalt anti-stripping agent adding device of claim 1, wherein: The first connecting pipe (202) is provided with a first control valve (201) at the top.

7. The asphalt anti-stripping agent adding device according to claim 1, characterized in that: The mixing baffle (303) is a circular plate.

8. The asphalt anti-stripping agent adding device according to claim 1, characterized in that: The first through hole (304) is circular and is arranged in the central area of the mixing baffle (303), and the second through hole (305) is fan-shaped and is arranged in the outer edge area of the mixing baffle (303).

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