Asphalt mixing production line and method

Abstract

The invention discloses an asphalt mixing production line and method.The production line comprises an aggregate bin, an aggregate drying device, an aggregate screening device, a hot aggregate bin, two sets of weighing bins, a powder tank, an asphalt supply tank, an oil temperature machine and a stirring device, the two sets of weighing bins are symmetrically arranged, the stirring device comprises a rotating motor, a central rotating shaft and a stirring tank, and the rotating motor is connected with the central rotating shaft; the number of the stirring tanks is at least two, the stirring tanks are arranged around the central rotating shaft, the stirring tanks are rotatably connected to the supporting shaft, outer gear rings are arranged on the stirring tanks, inner gear rings in meshed connection with the outer gear rings are arranged on the stirring platform, and the stirring tanks and the asphalt supply tank are both communicated with the oil temperature machine. Mixtures with different particle sizes are prepared through the two weighing bins respectively, the prepared mixtures can enter the two stirring tanks to be stirred respectively, two asphalt mixtures with different specifications are produced at the same time, the stirring tanks can conduct stirring around revolution and rotation, and the stirring uniformity and efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt processing, and in particular to an asphalt mixing production line and method. Background Art

[0002] The asphalt concrete materials used for existing road paving are generally mixed in large mixing plants and then transported to the paving site for pavement paving. Different application scenarios require the selection of asphalt mixtures of different specifications to ensure the long-term stability and safety of the road. However, the existing mixing production line can only produce one specification of asphalt mixture at a time. When two different road surfaces need to be paved at the same time, production can only be switched in turns, which is inefficient. There are some existing asphalt mixing production lines, such as the asphalt mixing production line disclosed in the Chinese patent application with publication number CN111530378A, which includes an asphalt melter, a powder conveyor and a mixing mechanism, wherein the asphalt melter conveys molten asphalt to the mixing mechanism, and the powder conveyor conveys powder to the mixing mechanism; the mixing mechanism includes a mixing barrel, a powder feeding assembly, an air blast assembly and a mixing processing assembly, wherein the powder feeding assembly and the air blast assembly are both arranged on the top of the mixing barrel, and the mixing processing assembly is arranged in the inner cavity of the mixing barrel; the patent application cuts the asphalt through the mixing processing assembly and quantitatively sprays the modified powder, and the two are mixed in a small particle state to achieve the purpose of uniform mixing, but when the asphalt mixture is produced in this way, only one specification of asphalt mixture can be produced in one mixing, and the simultaneous production demand of asphalt mixtures of different specifications cannot be met. Summary of the invention

[0003] The main purpose of the present invention is to overcome the defects of the above-mentioned background technology and provide an asphalt mixing production line and method.

[0004] To achieve the above-mentioned purpose, the asphalt mixing production line proposed in the present invention includes an aggregate bin, an aggregate drying device, an aggregate screening device, a hot material bin, a weighing bin, a powder tank, an asphalt supply tank, an oil temperature machine and a stirring device, wherein the aggregate bin, the aggregate drying device, the aggregate screening device, the hot material bin and the weighing bin are connected in sequence, the powder tank and the asphalt supply tank are both connected to the weighing bin, the bottom discharge port of the weighing bin corresponds to the feed port of the stirring device, at least two temporary storage chambers are separated in the hot material bin, the weighing bin is symmetrically provided with two groups, and the feed ends of the two groups of weighing bins correspond to the bottom outlets of the temporary storage chambers respectively, the stirring device includes a rotating motor, a central rotating shaft and a stirring tank, the output of the rotating motor The outlet end is connected to one end of the central rotating shaft, and the central rotating shaft is rotatably arranged vertically on the mixing platform. There are at least two mixing tanks, and the mixing tank is surrounded by the central rotating shaft through a supporting shaft. One end of the supporting shaft is fixedly connected to the central rotating shaft, and the other end of the supporting shaft is rotatably connected to the mixing tank. A feeding hopper is provided on the top of the mixing tank, and a finished product discharge port is provided at the bottom of the mixing tank. A discharge valve is provided at the finished product discharge port. An outer tooth ring is provided on the tank body of the mixing tank, and an inner tooth ring meshing with the outer tooth ring is fixedly provided on the mixing platform. The mixing tank and the asphalt supply tank both adopt a sandwich tank structure, and the interlayer of the mixing tank and the asphalt supply tank are both connected to the oil temperature machine. Two sets of weighing bins are used to weigh and prepare asphalt mixtures of two different particle sizes. When the two mixing tanks rotate to directly below the two sets of weighing bins, the weighed and prepared asphalt mixtures can enter the two mixing tanks at the same time for mixing, and two asphalt mixtures of different specifications can be produced at the same time, effectively improving production efficiency; the mixing tank is driven by a rotating motor to rotate around the central rotating axis, and an outer gear ring is provided on the tank body of the mixing tank, and an inner gear ring is fixed on the mixing platform. When the rotating motor drives the mixing tank to rotate, the mixing tank can rotate on its own for mixing, thereby improving mixing uniformity.

[0005] Furthermore, the central rotating shaft and the supporting shaft are evenly provided with a heat transfer oil delivery channel and a heat transfer oil return channel, the top of the central rotating shaft is provided with a first rotary joint, the end of the supporting shaft connected to the mixing tank is provided with a second rotary joint, the oil outlet of the oil temperature machine is connected to the inlet end of the first rotary joint through an oil outlet pipe, and the oil return port of the oil temperature machine is connected to the outlet end of the first rotary joint through an oil return pipe. The heat transfer oil in the oil temperature machine enters the interlayer of the mixing tank through the oil outlet pipe, the first rotary joint, the heat transfer oil delivery channel and the second rotary joint to heat the mixture in the tank, and then returns to the oil temperature machine from the second rotary joint, the heat transfer oil return channel, the first rotary joint and the oil return pipe. The asphalt mixture in the mixing tank is circulated and heated by the heat transfer oil in the oil temperature machine to ensure the temperature in the tank and prevent the asphalt from solidifying in the tank.

[0006] Furthermore, a plurality of stirring blades are provided on the inner wall of the mixing tank, the stirring blades are hollow in structure, and the stirring blades are connected to the interlayer of the mixing tank. By setting the stirring blades as hollow in structure, the contact area during asphalt mixture mixing is increased, and the uniformity of mixing temperature is ensured.

[0007] Furthermore, there are four mixing tanks, which are arranged symmetrically at the center, and a feeding valve is provided at the bottom discharge port of the weighing bin. When the mixing tank stops rotating, the bottom discharge ports of the two groups of weighing bins correspond to the feed hoppers on the two mixing tanks arranged symmetrically at the center. The mixing operation is continuously and alternately performed by the four mixing tanks, thereby further improving the mixing production efficiency.

[0008] Furthermore, it also includes a flue gas treatment device, which includes a first air collecting hood, a second air collecting hood, a cyclone dust collector, a bag dust collector and a chimney. The first air collecting hood is arranged above the aggregate bin and the aggregate drying device. The first air collecting hood is connected with a first smoke duct, the first smoke duct is connected with the inlet of the cyclone dust collector, the air outlet of the cyclone dust collector is connected with the inlet of the bag dust collector, the air outlet of the bag dust collector is connected with the chimney, and a first induced draft fan is provided on the pipeline connecting the air outlet of the bag dust collector with the chimney. The aggregate screening device, the hot material bin and the weighing bin are vertically arranged from top to bottom in sequence. The second air collecting hood is arranged above the aggregate screening device and the powder tank. The second air collecting hood is connected with a second smoke duct, and one end of the second smoke duct is connected with the first smoke duct. The dust overflowing from the production line is collected by the first and second air collecting hoods, and then introduced into the cyclone dust collector and bag dust collector for two-stage dust removal before being discharged to avoid dust pollution of the environment.

[0009] Furthermore, the flue gas treatment device also includes a flue gas cooler, a UV photolysis purifier, a third air hood and a fourth air hood. The third air hood is arranged around the weighing bin, and the fourth air hood is arranged around the stirring platform. The third air hood is connected to a third smoke duct, and the fourth air hood is connected to a fourth smoke duct. The third smoke duct and the fourth smoke duct are both connected to the flue gas cooler. The air outlet of the flue gas cooler is connected to the inlet of the UV photolysis purifier, and the outlet of the UV photolysis purifier is connected to the inlet of the cyclone dust collector. The flue gas containing asphalt is collected by the third air hood and the fourth air hood. Since this process is also mixed with a certain amount of dust, the flue gas is first passed into the flue gas cooler to remove the asphalt in the flue gas, and then passed into the UV photolysis purifier for photolysis purification. Finally, it is subjected to two-stage dust removal through the cyclone dust collector and the bag dust collector to effectively remove pollutants in the asphalt flue gas.

[0010] Furthermore, the flue gas cooler includes a plurality of heat exchange tubes and an asphalt collecting box, wherein the plurality of heat exchange tubes are vertically arranged on the asphalt collecting box, the third smoke duct and the fourth smoke duct are respectively connected to the top of the tube side of the heat exchange tube after being converged into one pipeline, the bottom of the tube side of the heat exchange tube is connected to the asphalt collecting box, and a cooling water pipe is connected to the shell side of the heat exchange tube. When cooling the asphalt flue gas, the flue gas cooler cools the asphalt through the heat exchange tubes, and the cooled asphalt liquid flows along the heat exchange tubes to the asphalt collecting box below for collection. After the asphalt flue gas is cooled, the hot water in the cooling water pipe can be led to the staff dormitory area and other places where hot water is needed for use, so as to recover the waste heat of the asphalt flue gas.

[0011] Furthermore, a fifth air collecting hood is provided above the asphalt supply tank, the fifth air collecting hood is connected to a fifth smoke duct, the fifth smoke duct is connected to the burner of the aggregate drying device, and a second induced draft fan is provided on the fifth smoke duct. The flue gas with high organic matter concentration and low dust content produced by the asphalt supply tank is introduced into the burner of the aggregate drying device through the second induced draft fan for combustion treatment, so as to effectively remove harmful substances in the flue gas.

[0012] The present invention also proposes an asphalt mixing production method, which uses the above-mentioned asphalt mixing production line to produce asphalt mixture, including the following steps: S1, aggregate processing step, the aggregate stored in the aggregate bin is transported to the aggregate drying device through a conveyor belt for drying treatment, the drying temperature is 180-200°C, and after the moisture content of the aggregate is detected to be less than 1%, it is transported to the aggregate screening device through a first lifting conveyor belt for screening, and aggregates of different particle sizes are obtained and stored in different temporary storage chambers in the hot material bin; S2, asphalt processing step, the asphalt stored in the asphalt supply tank is heated by an oil temperature machine, and the heating temperature is The temperature is 160-170℃; S3, asphalt mixture preparation process, according to the specifications and formula of the required asphalt mixture, the aggregates of different particle sizes in the temporary storage cavity are added to the two weighing bins respectively, and the powder stored in the powder tank is transported to the two weighing bins through the second lifting conveyor belt, and the asphalt stored in the asphalt supply tank is transported to the two weighing bins through the asphalt supply pump. The two weighing bins complete the weighing and preparation of asphalt mixtures of different formulas at the same time; S4, asphalt mixture mixing process, after the weighing and preparation of the asphalt mixtures of different formulas in the two weighing bins are completed, the discharge valve at the bottom is opened, and the two weighing bins are The asphalt mixture in the mixing tank falls into the mixing tank of the mixing device below, and the rotating motor is started to drive the central shaft to rotate. The central shaft drives the mixing tank to revolve around the central shaft. The mixing tank can rotate and mix by the cooperation of the outer gear ring and the inner gear ring during the revolution. The mixing time is 20s-35s, and the mixing temperature is 175-185℃. Two asphalt mixtures of different specifications are obtained. After stopping the mixing, the discharge valve at the bottom of the mixing tank is opened to discharge the asphalt mixture in the tank for external use. S5, smoke treatment process. The smoke generated by the aggregate silo and the aggregate drying device during the production process is collected by the first gas collecting hood. The dust generated by the aggregate screening device and the powder tank is collected by the second gas collecting hood and sent to the cyclone dust collector and the bag dust collector for treatment in turn, and then discharged from the chimney; the asphalt-containing flue gas generated by the weighing bin and the stirring device is collected by the third gas collecting hood and the fourth gas collecting hood respectively, and then sent to the flue gas cooler for cooling and then enters the UV photolysis purifier for treatment. The treated flue gas is then sent to the cyclone dust collector and the bag dust collector for treatment and then discharged from the chimney; the asphalt flue gas generated by the asphalt supply tank is collected by the fifth gas collecting hood and sent to the burner of the aggregate drying device for combustion treatment, and the heat generated by the treatment is used to dry the aggregate.

[0013] Furthermore, in steps S3 and S4, the stirring device is provided with four stirring tanks in a centrally symmetrical layout, and the four stirring tanks are grouped in two. When one group of stirring tanks completes mixing and discharges the asphalt mixture in the tank, the other group of stirring tanks simultaneously adds the prepared asphalt mixture to be mixed through the weighing bin; during the rotating mixing process of the stirring tanks, the asphalt mixture preparation process of step S3 is executed.

[0014] The beneficial effects of the present invention include: by setting two groups of weighing bins for weighing and preparing asphalt mixtures of two different particle sizes, when the two mixing tanks rotate to the bottom of the two groups of weighing bins respectively, the weighed and prepared asphalt mixtures can enter the two mixing tanks at the same time for mixing, and produce two asphalt mixtures of different specifications at the same time, effectively improving production efficiency; the mixing tank is driven by a rotating motor to rotate around the central rotating shaft, so that the mixing tank can be effectively switched between the material receiving and discharging stations, and centrifugal mixing can be performed during the rotation process; the mixing tank is rotatably arranged on the support shaft, and an outer gear ring is arranged on the tank body of the mixing tank, and an inner gear ring is fixedly arranged on the mixing platform, the outer gear ring is meshed with the inner gear ring, and when the rotation drives the mixing tank to rotate, the mixing tank can rotate on its own for mixing, thereby improving mixing uniformity and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an overall schematic diagram of an asphalt mixing production line in an embodiment of the present invention.

[0016] Figure 2 Schematic diagram of a hot material bin in an embodiment of the present invention.

[0017] Figure 3 It is a schematic diagram of the installation of an aggregate screening device, a hot material bin, a weighing bin and a stirring device in an embodiment of the present invention.

[0018] Figure 4 Schematic diagram of a stirring device in an embodiment of the present invention.

[0019] Figure 5 Schematic diagram of the interior of a stirring tank in an embodiment of the present invention.

[0020] Figure 6 Schematic diagram of the connection of the flue gas treatment device in the embodiment of the present invention.

[0021] Figure 7 Schematic diagram of a flue gas cooler in an embodiment of the present invention.

[0022] Figure 8 It is a flow chart of the asphalt mixing production method in an embodiment of the present invention.

[0023] Figure numerals: 1 aggregate bin; 101 aggregate conveyor belt; 2 aggregate drying device; 201 first lifting conveyor belt; 3 aggregate screening device; 4 hot material bin; 5 weighing bin; 501 feeding valve; 6 powder tank; 601 second lifting conveyor belt; 7 asphalt supply tank; 8 oil temperature machine; 801 oil outlet pipe; 802 oil return pipe; 9 stirring device; 901 rotating motor; 902 central rotating shaft; 9021 first rotary joint; 903 stirring tank; 9031 stirring blade; 904 supporting shaft; 9041 second rotary joint; 905 feeding hopper; 906 finished product discharge port; 907 discharge valve; 908 outer gear ring; 909 inner gear ring; 10 stirring platform; 11 Flue gas treatment device; 1101 first air collecting hood; 1102 second air collecting hood; 1103 cyclone dust collector; 1104 bag dust collector; 1105 chimney; 1106 first smoke duct; 1107 first induced draft fan; 1108 second smoke duct; 1109 flue gas cooler; 11091 heat exchange tubes; 11092 asphalt collecting box; 11093 cooling water pipe; 11094 asphalt liquid discharge pipe; 1110 UV photolysis purifier; 1111 third air collecting hood; 1112 fourth air collecting hood; 1113 third smoke duct; 1114 fourth smoke duct; 1115 fifth air collecting hood; 1116 fifth smoke duct; 1117 second induced draft fan. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the embodiments of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for both fixing and circuit connection.

[0026] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] Example 1

[0029] See also Figures 1 to 7The asphalt mixing production line disclosed in the present invention comprises an aggregate bin 1, an aggregate drying device 2, an aggregate screening device 3, a hot material bin 4, a weighing bin 5, a powder tank 6, an asphalt supply tank 7, an oil temperature machine 8 and a stirring device 9. The aggregate bin 1, the aggregate drying device 2, the aggregate screening device 3, the hot material bin 4 and the weighing bin 5 are connected in sequence, and are used to transport the aggregate stored in the aggregate bin 1 to the aggregate drying device 2 for drying, and then lift it to the aggregate screening device 3 for screening, and after screening out aggregates of different particle sizes, they are respectively stored in the hot material bin 4, and then added to the weighing bin 5 for quantitative weighing according to the formula requirements of the asphalt mixture. The powder tank 6 and the asphalt supply tank 7 are both connected to the weighing bin 5, and the weighing The discharge port at the bottom of the bin 5 corresponds to the feed port of the stirring device 9. After the aggregate, powder and asphalt liquid are quantitatively weighed and prepared in the weighing bin 5, they enter the stirring device 9 from the discharge port at the bottom under the action of gravity to be evenly mixed to become the finished product. At least two temporary storage chambers 401 are separated in the hot material bin 4. The temporary storage chambers 401 are respectively used to store aggregates of different particle sizes screened from the aggregate screening device 3. The weighing bin 5 is centrally symmetrically provided with two groups. The feed ends of the two groups of weighing bins 5 correspond to the bottom outlets of the temporary storage chambers 401 respectively. Aggregates of different particle sizes fall into different weighing bins 5 below under the action of gravity for weighing, so as to simultaneously configure asphalt mixtures of different particle sizes.The stirring device 9 includes a rotating motor 901, a central rotating shaft 902 and a stirring tank 903. The output end of the rotating motor 901 is connected to one end of the central rotating shaft 902. The central rotating shaft 902 can be rotatably arranged vertically at the center of the stirring platform 10. There are at least two stirring tanks 903. The stirring tanks 903 are arranged around the central rotating shaft 902 through a support shaft 904. Specifically, the support shaft 904 is an L-shaped structure. The powder tank 6 and the asphalt supply tank 7 are arranged on both sides of the stirring platform 10 and are respectively connected to the two groups of weighing bins 5. One end of the support shaft 904 is horizontally fixedly connected to the central rotating shaft 902, and the other end of the support shaft 904 is rotatably connected to the top center of the stirring tank 903. A feed hopper 905 is provided on the top of the mixing tank 903, and the bottom end of the feed hopper 905 is communicated with the inside of the mixing tank 903. A finished product discharge port 906 is provided at the bottom of the mixing tank 903, and a discharge valve 907 is provided at the finished product discharge port 906. The asphalt mixture in the process of mixing is discharged from the finished product discharge port 906 and falls to the transport vehicle below. An outer gear ring 908 is provided on the tank body of the mixing tank 903, and an inner gear ring 909 meshingly connected with the outer gear ring 908 is fixedly provided on the mixing platform 10. The mixing tank 903 and the asphalt supply tank 7 both adopt a sandwich tank structure. The interlayer of the mixing tank 903 and the asphalt supply tank 7 are both communicated with the oil temperature machine 8, and the heat transfer oil in the oil temperature machine 8 is used to heat the asphalt mixture. The asphalt liquid stored in the asphalt supply tank 7 is heated, and the asphalt mixture in the mixing tank 903 is heated to ensure the mixing temperature. Specifically, a heat transfer oil delivery channel (not shown) and a heat transfer oil return channel (not shown) are evenly distributed inside the central rotating shaft 902 and the support shaft 904. The heat transfer oil delivery channel inside the central rotating shaft 902 is connected to the heat transfer oil delivery channel inside the support shaft 904, and the heat transfer oil return channel inside the central rotating shaft 902 is also connected to the heat transfer oil return channel inside the support shaft 904. A first rotary joint 9021 is provided at the top of the central rotating shaft 902, and a second rotary joint 9 is provided at the end where the support shaft 904 is connected to the mixing tank 903. 041, the oil outlet of the oil temperature machine 8 is connected to the inlet end of the first rotary joint 9021 through the oil outlet pipe 801, and the oil return port of the oil temperature machine 8 is connected to the outlet end of the first rotary joint 9021 through the oil return pipe 802. The heat transfer oil in the oil temperature machine 8 enters the interlayer of the mixing tank 903 through the oil outlet pipe 801, the first rotary joint 9021, the heat transfer oil delivery channel and the second rotary joint 9041 to heat the mixture in the tank and then returns to the oil temperature machine 8 from the second rotary joint 9041, the heat transfer oil return channel, the first rotary joint 9021 and the oil return pipe 802 for circulation heating, so as to ensure the temperature of the asphalt mixture in the mixing tank 903 is stable, and to avoid the solidification of the asphalt mixture and affect the mixing effect;In this embodiment, two groups of weighing bins 5 are provided for weighing and preparing two asphalt mixtures of different particle sizes. When the two mixing tanks 903 rotate to the bottom of the two groups of weighing bins 5, the weighed and prepared asphalt mixtures can enter the two mixing tanks 903 for mixing at the same time, and two asphalt mixtures of different specifications can be produced at the same time, which effectively improves production efficiency. The mixing tank 903 is driven to rotate around the central rotating shaft 902 by the rotating motor 901, so that the mixing tank 903 can be effectively switched between the material receiving and material discharging stations, and centrifugal mixing can be performed during the rotation process. The mixing tank 903 is rotatably arranged at one end of the support shaft 904, and an outer gear ring 908 is provided on the tank body of the mixing tank 903, and an inner gear ring 909 is fixedly provided on the mixing platform 10, and the outer gear ring 908 is meshed with the inner gear ring 909. When the rotating motor 901 drives the mixing tank 903 to rotate, the mixing tank 903 can rotate to mix, thereby improving the mixing uniformity. ;

[0030] Example 2

[0031] See also Figure 5 In order to further ensure the temperature uniformity of the asphalt mixture in the mixing tank 903 and avoid the mixing effect being affected by uneven temperature, this embodiment is based on Example 1 and provides a stirring blade 9031 in the mixing tank 903. A plurality of stirring blades 9031 are provided on the inner wall of the mixing tank 903, and the stirring blades 9031 are hollow in structure. The stirring blades 9031 are interconnected with the interlayer of the mixing tank 903, and the heat transfer oil entering the interlayer of the mixing tank 903 from the oil temperature machine 8 can enter the stirring blades 9031, thereby increasing the heat exchange contact area of ​​the asphalt mixture in the mixing tank 903 and avoiding the uneven temperature of the asphalt mixture in the middle part due to the excessive diameter of the mixing tank 903, thereby affecting the mixing effect.

[0032] Example 3

[0033] Please continue reading Figures 1 to 7 In order to further improve the production efficiency, this embodiment configures the number of mixing tanks 903 to four on the basis of Embodiments 1 and 2. The four mixing tanks 903 are arranged in a centrally symmetrical manner. A feeding valve 501 is provided at the bottom discharge port of the weighing bin 5. When the mixing tank 903 stops rotating, the bottom discharge ports of the two groups of weighing bins 5 correspond to the feeding hoppers 905 on the two mixing tanks 903 arranged in a centrally symmetrical manner, respectively. By dividing the four mixing tanks 903 into two groups, with the two centrally symmetrical ones as one group, when one group of mixing tanks 903 completes mixing and discharges the asphalt mixture in the tank for external use, the other group of mixing tanks 903 simultaneously opens the feeding valve 501 at the bottom of the weighing bin 5 to add the prepared asphalt mixture to be mixed. During the rotating mixing process of the mixing tanks 903, the weighing bin 5 weighs and prepares the asphalt mixture, which can effectively shorten the production cycle and further improve the production efficiency.

[0034] Example 4

[0035] See also Figure 1 , Figure 6 , Figure 7In order to prevent the asphalt fume and dust generated during the production process from polluting the environment and affecting the physical and mental health of operators, this embodiment adds a fume treatment device 11 on the basis of the above embodiment. The asphalt mixing production line of this embodiment also includes a fume treatment device 11, and the fume treatment device 11 includes a first air collection hood 1101, a second air collection hood 1102, a cyclone dust collector 1103, a bag dust collector 1104 and a chimney 1105. The first air collection hood 1101 is arranged between the aggregate bin 1 and the aggregate drying device 1103. The first air collecting hood 1101 is connected with a first smoke duct 1106, which is connected to the inlet of the cyclone dust collector 1103, and the air outlet of the cyclone dust collector 1103 is connected to the inlet of the bag dust collector 1104, and the air outlet of the bag dust collector 1104 is connected to the chimney 1105, and the air outlet of the bag dust collector 1104 is connected to the chimney 1105. The pipeline is provided with a first induced draft fan 1107. The aggregate screening device 3, the hot material bin 4 and the weighing bin 5 are arranged vertically on the mixing platform 10 from top to bottom in sequence, so as to reduce the space occupation and facilitate the addition of aggregates. The second air collecting hood 1102 is arranged above the aggregate screening device 3 and the powder tank 6, and is used to collect the dust overflowed during the lifting and transportation of the aggregate screening device 3, the hot material bin 4 and the powder tank 6. The second air collecting hood 1102 is connected with a second smoke duct 1108. The second smoke duct 1108 One end is connected to the first smoke duct 1106, and negative pressure is provided by the first induced draft fan 1107 to extract the dust overflowing from the aggregate bin 1, the aggregate screening device 3, the hot material bin 4, and the powder tank 6, and the smoke generated by the aggregate drying device 2 when drying the aggregate, and the smoke is sequentially passed through the cyclone dust collector 1103 and the bag dust collector 1104 for dust removal. Since these processes do not generate asphalt smoke, most of them are mainly dust particles, and the cyclone dust collector 1103 and the bag dust collector 1104 can effectively remove the dust;The flue gas treatment device 11 also includes a flue gas cooler 1109, a UV photolysis purifier 1110, a third gas collecting hood 1111 and a fourth gas collecting hood 1112. The third gas collecting hood 1111 is arranged around the weighing bin 5 to collect asphalt fume and dust overflowing from the weighing bin 5. The fourth gas collecting hood 1112 is arranged around the mixing platform 10 to collect asphalt fume and dust generated and overflowed during mixing. The third gas collecting hood 1111 is connected to a third smoke duct 1113, and the fourth gas collecting hood 1112 is connected to a fourth smoke duct 1114. The smoke pipe 1114, the third smoke duct 1113 and the fourth smoke duct 1114 are all connected to the smoke cooler 1109. The smoke cooler 1109 includes a plurality of heat exchange tubes 11091 and an asphalt collecting box 11092. The plurality of heat exchange tubes 11091 are vertically arranged on the asphalt collecting box 11092. The third smoke duct 1113 and the fourth smoke duct 1114 are respectively connected to the top of the tube pass of the heat exchange tube 11091 after being converged into one pipeline. The bottom of the tube pass of the heat exchange tube 11091 is connected to the asphalt collecting box 11092. The shell side of the heat exchange tube 11091 is connected with a cooling water pipe 11093, the gas outlet of the flue gas cooler 1109 is connected with the inlet of the UV photolysis purifier 1110, and the outlet of the UV photolysis purifier 1110 is connected with the inlet of the cyclone dust collector 1103. The dust containing asphalt flue gas is quickly cooled by the flue gas cooler 1109, and the asphalt is attached to the inner wall of the heat exchange tube 11091 and flows along the heat exchange tube 11091 to be collected in the asphalt collection box 11092 at the bottom. The collected asphalt liquid is discharged from the asphalt liquid discharge pipe 1109. 094 is discharged. When the cooling effect is not good, several heat exchange tubes 11091 can be switched for use. After cooling pretreatment, most of the asphalt in the asphalt-containing flue gas is collected, and a small part of the asphalt-containing flue gas continues to enter the UV photolysis purifier 1110 for treatment. The remaining organic matter is decomposed and purified under the combined action of ultraviolet light and plasma. The purified flue gas enters the cyclone dust collector 1103 and the type dust collector 1104 for dust removal and can be discharged from the chimney 1105, effectively avoiding pollution of the environment and affecting the physical and mental health of operators.As the asphalt fume overflowing from the asphalt supply tank 7 does not contain impurities such as dust, the concentration of organic waste gas in the fume is relatively high. A fifth air collecting hood 1115 is provided above the asphalt supply tank 7. The fifth air collecting hood 1115 is connected to a fifth smoke duct 1116. The fifth smoke duct 1116 is connected to the burner of the aggregate drying device 2. A second induced draft fan 1117 is provided on the fifth smoke duct 1116 to guide the asphalt fume overflowing from the asphalt supply tank 7 to the burner of the aggregate drying device 2 for combustion treatment. The particulate fume generated by the combustion of the aggregate drying device 2 is collected by the first air collecting hood 1101 and sent to the cyclone dust collector 1103 and the bag dust collector 1104 for two-stage dust removal and then discharged from the chimney 1105. According to the characteristics of different concentrations of asphalt fume and dust generated in different production processes, this embodiment only requires cyclone dust collector 1103 and type dust collector 1104 to effectively remove dust in processes without asphalt fume. In processes with low organic content and more dust impurities in asphalt fume, flue gas cooler 1109 and UV photolysis purifier 1110 are first used before entering cyclone dust collector 1103 and type dust collector 1104 for two-stage dust removal. In processes with high organic content and low dust content in asphalt fume, the flue gas is introduced into the burner of aggregate drying device 2 for combustion treatment, which can effectively treat asphalt fume and dust, reduce the processing load of flue gas treatment device 11, and avoid asphalt fume polluting the environment and affecting the physical and mental health of operators. ;

[0036] Example 5

[0037] See also Figures 1 to 8The asphalt mixing production method disclosed in this embodiment uses the above-mentioned asphalt mixing production line to produce asphalt mixture, including the following steps: S1, aggregate processing step, the aggregate stored in the aggregate bin 1 is transported to the aggregate drying device 2 through the aggregate conveyor belt 101 for drying, the drying temperature is controlled to be 180-200°C, specifically 180°C, 190°C or 200°C, preferably 190°C, after the moisture content of the aggregate is detected to be less than 1%, it is transported to the aggregate screening device 3 through the first lifting conveyor belt 201 for screening, and aggregates of different particle sizes are obtained and stored in different temporary storage chambers 401 in the hot bin 4; S2, asphalt processing step, the asphalt stored in the asphalt supply tank 7 is heated by the oil temperature machine 8, The heating temperature is 160-170°C, which is 160°C, 165°C or 170°C, preferably 165°C, to enhance the fluidity of asphalt; S3, asphalt mixture preparation process, according to the specification formula of the required asphalt mixture, the aggregates of different particle sizes in the temporary storage chamber 401 are respectively added to the two groups of weighing bins 5, and the powder stored in the powder tank 6 is transported to the two groups of weighing bins 5 through the second lifting conveyor belt 601, and the asphalt stored in the asphalt supply tank 7 is pumped to the two groups of weighing bins 5 through the asphalt supply pump (as shown in the figure), and the two groups of weighing bins 5 simultaneously complete the weighing preparation of asphalt mixtures of different formulations; S4, asphalt mixture mixing process, after the weighing preparation of the asphalt mixtures of different formulations in the two groups of weighing bins 5 is completed, open The discharge valve 907 at the bottom, the asphalt mixtures in the two groups of weighing bins 5 fall into the mixing tank 903 of the stirring device 9 below, and then the rotating motor 901 is started to drive the central rotating shaft 902 to rotate, and the central rotating shaft 902 drives the mixing tank 903 to revolve around the central rotating shaft 902. The mixing tank 903 can rotate and mix by the cooperation of the outer gear ring 908 and the inner gear ring 909 during the revolution. The mixing time is 20s-35s, specifically 20s, 30s or 35s, preferably 30s, and the mixing temperature is 175-185℃, specifically 175℃, 180℃ or 185℃, preferably 180℃, to obtain two asphalt mixtures of different specifications. After stopping the mixing, the discharge valve at the bottom of the mixing tank 903 is opened. The asphalt mixture in the discharge tank 907 is transported for use. In this step, the mixing device 9 has four mixing tanks 903 arranged in a centrally symmetrical manner. The four mixing tanks 903 are grouped in two. When one group of mixing tanks 903 has finished mixing the asphalt mixture in the discharge tank, the other group of mixing tanks 903 simultaneously adds the prepared asphalt mixture to be mixed through the weighing bin 5. During the mixing process of the mixing tanks 903 rotating, the asphalt mixture preparation process of step S3 is executed, which effectively shortens the production cycle and improves production efficiency. Specifically, after a group of mixing tanks 903 has finished mixing, the transport vehicles reverse from the left and right sides of the bottom of the mixing platform 10 to enter the bottom of the mixing tanks 903 to receive the finished asphalt mixture discharged from the mixing tanks 903.S5, flue gas treatment process, during the production process, the smoke generated by the aggregate bin 1 and the aggregate drying device 2 is collected by the first gas collection hood 1101, and the dust generated by the aggregate screening device 3 and the powder tank 6 is collected by the second gas collection hood 1102 and sent to the cyclone dust collector 1103 and the bag dust collector 1104 for treatment in turn, and then discharged from the chimney 1105; the asphalt-containing smoke generated by the weighing bin 5 and the stirring device 9 is collected by the third gas collection hood 1111 and the fourth gas collection hood 1112 respectively, and then sent to the smoke cooler 1109 for cooling and then enters the UV photolysis purifier 1110 for treatment. The treated smoke is then sent to the cyclone dust collector 1103 and the bag dust collector 1104 for treatment and then discharged from the chimney 1105; the asphalt smoke generated by the asphalt supply tank 7 is collected by the fifth gas collection hood 1115 and sent to the burner of the aggregate drying device 2 for combustion treatment, and the heat generated by the treatment is used to dry the aggregate. ;

[0038] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, they can also make several substitutions or modifications to these described embodiments, and these substitutions or modifications should be regarded as belonging to the protection scope of the present invention. In the description of this specification, the description of reference terms "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In the absence of mutual contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and modifications can be made herein without departing from the scope of protection of the patent application.

Claims

1. An asphalt mixing production line, comprising an aggregate bin, an aggregate drying device, an aggregate screening device, a hot material bin, a weighing bin, a powder tank, an asphalt supply tank, an oil temperature machine and a stirring device, wherein the aggregate bin, the aggregate drying device, the aggregate screening device, the hot material bin and the weighing bin are connected in sequence, the powder tank and the asphalt supply tank are both connected to the weighing bin, and the bottom discharge port of the weighing bin corresponds to the feed port of the stirring device, characterized in that: At least two temporary storage chambers are separated in the hot material bin, and the weighing bins are symmetrically provided with two groups, and the feed ends of the two groups of weighing bins correspond to the bottom outlets of the temporary storage chambers respectively. The stirring device comprises a rotating motor, a central rotating shaft and a stirring tank, and the output end of the rotating motor is connected to one end of the central rotating shaft, and the central rotating shaft is rotatably arranged vertically on the stirring platform. There are at least two stirring tanks, and the stirring tank is surrounded by the central rotating shaft through a supporting shaft, one end of the supporting shaft is fixedly connected to the central rotating shaft, and the other end of the supporting shaft is rotatably connected to the stirring tank. A feeding hopper is provided on the top of the stirring tank, and a finished product discharge port is provided at the bottom of the stirring tank, and a discharge valve is provided at the finished product discharge port. An outer gear ring is provided on the tank body of the stirring tank, and an inner gear ring meshing with the outer gear ring is fixedly provided on the stirring platform. The stirring tank and the asphalt supply tank both adopt a sandwich tank structure, and the interlayer of the stirring tank and the asphalt supply tank are both connected to the oil temperature machine.

2. The asphalt mixing production line according to claim 1, characterized in that: The interiors of the central rotating shaft and the supporting shaft are evenly provided with heat transfer oil delivery channels and heat transfer oil return channels. A first rotary joint is provided at the top of the central rotating shaft, and a second rotary joint is provided at one end of the supporting shaft connected to the mixing tank. The oil outlet of the oil temperature machine is connected to the inlet end of the first rotary joint through an oil outlet pipe, and the oil return port of the oil temperature machine is connected to the outlet end of the first rotary joint through an oil return pipe. The heat transfer oil in the oil temperature machine enters the interlayer of the mixing tank through the oil outlet pipe, the first rotary joint, the heat transfer oil delivery channel and the second rotary joint to heat the mixed material in the tank, and then returns to the oil temperature machine from the second rotary joint, the heat transfer oil return channel, the first rotary joint and the return oil pipe.

3. The asphalt mixing production line according to claim 2, characterized in that: A plurality of stirring blades are arranged on the inner wall of the stirring tank. The stirring blades are hollow in structure and are communicated with the interlayer of the stirring tank.

4. The asphalt mixing production line according to claim 3, characterized in that: There are four stirring tanks, which are arranged symmetrically with respect to the center. A feeding valve is provided at the bottom discharge port of the weighing bin. When the stirring tank stops rotating, the two groups of bottom discharge ports of the weighing bin respectively correspond to the feeding hoppers on the two stirring tanks which are arranged symmetrically with respect to the center.

5. The asphalt mixing production line according to any one of claims 1 to 4, characterized in that: The smoke treatment device also includes a first air hood, a second air hood, a cyclone dust collector, a bag dust collector and a chimney. The first air hood is arranged above the aggregate bin and the aggregate drying device. The first air hood is connected with a first smoke duct, the first smoke duct is connected with the inlet of the cyclone dust collector, the air outlet of the cyclone dust collector is connected with the inlet of the bag dust collector, the air outlet of the bag dust collector is connected with the chimney, and a first induced draft fan is arranged on the pipeline connecting the air outlet of the bag dust collector and the chimney. The aggregate screening device, the hot material bin and the weighing bin are vertically arranged from top to bottom in sequence. The second air hood is arranged above the aggregate screening device and the powder tank. The second air hood is connected with a second smoke duct, and one end of the second smoke duct is connected with the first smoke duct.

6. The asphalt mixing production line according to claim 5, characterized in that: The flue gas treatment device also includes a flue gas cooler, a UV photolysis purifier, a third air collecting hood and a fourth air collecting hood. The third air collecting hood is arranged around the weighing bin, and the fourth air collecting hood is arranged around the stirring platform. The third air collecting hood is connected to a third smoke duct, and the fourth air collecting hood is connected to a fourth smoke duct. The third smoke duct and the fourth smoke duct are both connected to the flue gas cooler, and the air outlet of the flue gas cooler is connected to the inlet of the UV photolysis purifier, and the outlet of the UV photolysis purifier is connected to the inlet of the cyclone dust collector.

7. The asphalt mixing production line according to claim 6, characterized in that: The flue gas cooler includes a plurality of heat exchange tubes and an asphalt collecting box. The plurality of heat exchange tubes are vertically arranged on the asphalt collecting box. The third smoke duct and the fourth smoke duct are converged into one pipeline and are respectively connected to the top of the tube side of the heat exchange tubes. The bottom of the tube side of the heat exchange tubes is connected to the asphalt collecting box. The shell side of the heat exchange tubes is connected with a cooling water pipe.

8. The asphalt mixing production line according to claim 7, characterized in that: A fifth air collecting hood is provided above the asphalt supply tank, the fifth air collecting hood is connected to a fifth smoke duct, the fifth smoke duct is connected to the burner of the aggregate drying device, and a second induced draft fan is provided on the fifth smoke duct.

9. An asphalt mixing production method, characterized in that: The asphalt mixing production line according to any one of claims 1 to 8 is used to produce asphalt mixture, comprising the following steps: S1, aggregate processing step, the aggregate stored in the aggregate bin is transported to the aggregate drying device through a conveyor belt for drying at a drying temperature of 180-200°C. After the moisture content of the aggregate is detected to be less than 1%, it is transported to the aggregate screening device through a first lifting conveyor belt for screening to obtain aggregates of different particle sizes and respectively stored in different temporary storage chambers in the hot bin; S2, asphalt processing step, heating the asphalt stored in the asphalt supply tank by an oil temperature machine, the heating temperature is 160-170℃; S3, asphalt mixture preparation process, according to the specifications and formulas of the required asphalt mixture, the aggregates of different particle sizes in the temporary storage cavity are added to the two groups of weighing bins respectively, and the powder stored in the powder tank is transported to the two groups of weighing bins through the second lifting conveyor belt, and the asphalt stored in the asphalt supply tank is transported to the two groups of weighing bins through the asphalt supply pump. The two groups of weighing bins simultaneously complete the weighing preparation of asphalt mixtures of different formulas; S4, asphalt mixture mixing process, after the asphalt mixtures of different formulas in the two weighing bins are weighed and prepared, the discharge valve at the bottom is opened, and the asphalt mixtures in the two weighing bins fall into the mixing tanks of the mixing device below respectively, and the rotating motor is started to drive the central rotating shaft to rotate, and the central rotating shaft drives the mixing tank to revolve around the central rotating shaft. During the revolving process of the mixing tank, the outer gear ring and the inner gear ring can rotate to mix, and the mixing time is 20s-35s, and the mixing temperature is 175-185℃, and two asphalt mixtures of different specifications are obtained. After stopping the mixing, the discharge valve at the bottom of the mixing tank is opened to discharge the asphalt mixture in the tank for external use; S5, flue gas treatment process, during the production process, the smoke generated by the aggregate bin and the aggregate drying device is collected by the first gas collecting hood, the dust generated by the aggregate screening device and the powder tank is collected by the second gas collecting hood and then sent to the cyclone dust collector and the bag dust collector for treatment in turn, and then discharged from the chimney; the asphalt-containing smoke generated by the weighing bin and the stirring device is collected by the third gas collecting hood and the fourth gas collecting hood respectively, and then sent to the smoke cooler for cooling and then enters the UV photolysis purifier for treatment. The treated smoke is then sent to the cyclone dust collector and the bag dust collector for treatment and then discharged from the chimney; the asphalt smoke generated by the asphalt supply tank is collected by the fifth gas collecting hood and sent to the burner of the aggregate drying device for combustion treatment, and the heat generated by the treatment is used to dry the aggregate.

10. The asphalt mixing production method according to claim 9, characterized in that: In steps S3 and S4, the stirring device is provided with four stirring tanks in a centrally symmetrical layout, and the four stirring tanks are grouped in two. When one group of stirring tanks finishes mixing and discharging the asphalt mixture in the tank, the other group of stirring tanks simultaneously adds the prepared asphalt mixture to be mixed through the weighing bin; during the rotating mixing process of the stirring tanks, the asphalt mixture preparation process of step S3 is executed.

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