Asphalt mixture cyclic heating device and method

Abstract

The invention relates to the field of asphalt heating, in particular to an asphalt mixture cyclic heating device and method.The asphalt mixture cyclic heating device comprises a heat preservation box body, a charging door is installed at the upper end of the heat preservation box body, and a feeding mechanism is installed on one side of the exterior of the heat preservation box body; a heat conduction oil layer and a heat preservation layer are arranged in the inner wall of the heat preservation box body, the heat conduction oil layer is connected with an external heat conduction oil electric heating system, an upper installation frame and a lower installation frame are installed at the middle end in the heat preservation box body, a rotating rod is installed between the upper installation frame and the lower installation frame, and stirring rods are installed on the rotating rod and evenly distributed on the outer side of the rotating rod at equal intervals. The rotating rod and the stirring rod can be driven to rotate through the bevel gear, then internal asphalt is driven to be rotationally stirred, the position of the asphalt in the heat preservation box body is continuously changed, and therefore the situation that heat is accumulated in the heat preservation box body and cannot be conducted into the heat preservation box body is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of asphalt heating, in particular to an asphalt mixture circulating heating device and method. BACKGROUND

[0002] With decades of high-speed development and rapid construction, China's road traffic infrastructure construction has achieved remarkable success, and asphalt pavement has good flatness, high driving comfort, convenient construction, and convenient maintenance and repair, etc. It is the main pavement type of the current high-grade highway, so asphalt is widely used in pavement construction. Asphalt is a black-brown complex mixture composed of different molecular weight hydrocarbons and their non-metallic derivatives, and is a kind of high-viscosity organic liquid. As a liquid medium, it will freeze when the temperature is too low, so the asphalt needs to be heated and kept warm.

[0003] The existing asphalt heating device, such as the asphalt concrete storage device with heating function disclosed in CN221368753U, includes support leg one, base, rotating seat, hydraulic cylinder, hinged seat, fixed plate, support leg two and bearing plate, which cooperate with each other to conveniently adjust the angle of the storage tank, so that the asphalt concrete storage device is more convenient when discharging asphalt concrete. The cooperation of the liquid storage tank, drive motor, stirring blade, heating pipe, resistance sheet, thermometer and connecting pipe can assist in heating the inside of the storage tank, thereby preventing freezing during asphalt concrete storage, thereby increasing the practicality of the asphalt concrete storage device.

[0004] However, the existing asphalt heating device mostly only heats the inner wall during the heating process, which easily causes temperature accumulation near the inner wall, resulting in a large temperature difference of asphalt at different positions inside the device, reducing the heat preservation effect, and the inner wall is easy to adhere to residual which is difficult to clean, affecting the subsequent use. SUMMARY

[0005] An asphalt mixture circulating heating device and method aims to solve the technical problems of temperature accumulation near the inner wall and easy adhesion of the inner wall to residual which is difficult to clean.

[0006] The application discloses a kind of asphalt mixture circulating heating device, including heat preservation box main body, the upper end of heat preservation box main body is equipped with loading door, the outer side of heat preservation box main body is equipped with feeding mechanism, feeding mechanism is connected with lifting feeding hopper by winch, steel wire rope, connecting seat, and is loaded by equipment front part, material is sent into heat preservation box main body inside, heat conduction oil layer and heat preservation layer are equipped in the inner wall of heat preservation box main body, heat conduction oil layer is connected with external heat conduction oil electric heating system, the middle end of heat preservation box main body inside is equipped with upper mounting bracket and lower mounting bracket, and upper mounting bracket and lower mounting bracket are equipped with rotating rod between them, rotating rod is equipped with stirring rod on it, and stirring rod is evenly distributed at its outer side, the lower end of rotating rod penetrates into lower mounting bracket inside, and two rotating rods are symmetrically arranged in heat preservation box main body, the upper end of rotating rod penetrates into upper mounting bracket inside, and installation groove is arranged in upper mounting bracket inside, and rotating rod is hollow inside, inner sleeve rod is installed in the inside of rotating rod, and stirring rod is fixedly connected with the outside of inner sleeve rod, and moving slot is arranged on the connecting place of rotating rod and inner sleeve rod outside corresponding stirring rod, the upper end of inner sleeve rod penetrates into installation groove from the inside of rotating rod, and scraping frame is installed in the upper end of heat preservation box main body inside, and scraping frame is arranged in rectangular, and is close to heat preservation box main body inside outside, and close plate is installed on the side of scraping frame outside close to the inner wall of box body, the section of close plate is triangular, and the acute angle end faces downward, and rotating push plate is installed on the side of the inclined surface of close plate, and rotating push plate is matched with inclined surface, and upper end is L-shaped and is bent into the inside of close plate, rotating shaft is arranged on the upper end of rotating push plate, worm gear rod is installed in the inside of close plate, and inclined wheel is arranged on one side of worm gear rod, screw head is installed on the upper end of close plate, and screw head lower end enters the inside of close plate, and connecting rod is arranged on the lower end of screw head, screw rod is arranged on the bottom of connecting rod, and is engaged with worm gear rod, and discharging auger is installed in the bottom of heat preservation box main body.

[0007] Preferably, the lower mounting bracket is internally provided with a driving rod, one end of the driving rod extends outward and is connected with a driving motor, and a bevel gear is arranged on the outer side of the driving rod corresponding to the lower end of the rotating rod.

[0008] Preferably, the inner wall of the installation groove is provided with an annular inclined groove, and the two sides of the annular inclined groove are respectively arc-shaped curved upward and downward.

[0009] Preferably, the outer side of the upper end of the inner sleeve rod is provided with a convex rod, and the outer end of the convex rod enters the annular inclined groove.

[0010] Preferably, a rotating screw is arranged on the inner side of the scraping frame, the outer side of the rotating screw is screwed with the inner side of the scraping frame, the lower end of the rotating screw enters the inside of the lower mounting bracket, and is engaged with the bevel gear on the driving rod.

[0011] As preferred, the close-together board is provided with a mounting block on one side, and the mounting block enters the inside of the scraping frame at one end, and the inside of the scraping frame is provided with a spring on one side corresponding to the mounting block.

[0012] As preferred, the close-together board is provided with a mounting block on one side, and the mounting block enters the inside of the scraping frame at one end, and the inside of the scraping frame is provided with a spring on one side corresponding to the mounting block.

[0013] As preferred, the connecting rod is provided with a one-way transmission connecting piece.

[0014] A bituminous mixture circulating heating method, comprising the following steps:

[0015] Firstly, the bituminous mixture is poured into the inside of the heat preservation box body by using the feeding mechanism, and then the loading door is closed to reduce heat loss;

[0016] Secondly, the heated oil liquid is sent into the inside of the heat preservation box body by connecting the external heat conducting oil electric heating system with the heat conducting oil layer;

[0017] Thirdly, the cooled oil liquid is guided out and sent back to the inside of the heat conducting oil heating system to be heated again to form a circulating flow;

[0018] Fourthly, the inside bituminous mixture is stirred to avoid heat accumulation on the inner wall by the rotating rod and the stirring rod installed in the inside of the heat preservation box body;

[0019] Fifthly, the mounting groove is arranged in the upper mounting frame, and the annular inclined groove is arranged on the inner wall of the mounting groove, so that the stirring rod moves up and down to make the bitumen upper and lower layers convective exchange heat;

[0020] Sixthly, the scraping frame moves downward on the inner wall of the heat preservation box body to avoid long-term adhesion of the bitumen on the inner wall;

[0021] Seventhly, the bitumen close to the inner wall is pushed to the middle by the rotating push plate to ensure that the temperature inside the heat preservation box body is uniform.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] 1. The utility model discloses a heat preservation box body inside the middle end is equipped with upper mounting bracket and lower mounting bracket, the lower mounting bracket inside is equipped with drive rod, and the one end of drive rod extends outward and is connected with drive motor, and the upper mounting bracket is equipped with rotating rod between lower mounting bracket, and the rotating rod is equipped with stirring rod, and the stirring rod is evenly distributed on its outside, and the lower end of rotating rod penetrates into the lower mounting bracket, and the lower end of rotating rod is equipped with bevel gear on the outside corresponding rotating rod, and the bottom of rotating rod is engaged with bevel gear, and the two of rotating rod are arranged in the heat preservation box body symmetry, and when drive rod rotates under the drive of external motor, can drive rotating rod and stirring rod to rotate through bevel gear, and then drive the asphalt in the inside to rotate and agitate, constantly change the position of asphalt in the heat preservation box body, to avoid the heat accumulation in the heat preservation box body and can not be conducted to the inside.

[0024] 2. The utility model discloses the upper end of rotating rod penetrates into the upper mounting bracket, and the upper mounting bracket is equipped with installation slot, and the inside of rotating rod is hollow, and the inside of rotating rod is equipped with inner sleeve rod, and the outside of stirring rod is fixedly connected with inner sleeve rod, and the outside of rotating rod is equipped with moving slot corresponding the connection of stirring rod and inner sleeve rod, and the upper end of inner sleeve rod penetrates into the installation slot from the inside of rotating rod, and the inner wall of installation slot is equipped with annular chute, and the two sides of annular chute are respectively curved upwards and downwards, and the outside of upper end of inner sleeve rod is equipped with convex rod, and the outer end of convex rod enters the annular chute, and when rotating rod rotates, can drive inner sleeve rod to rotate in the installation slot, and then drive convex rod to move up and down along the shape of annular chute, and then drive inner sleeve rod and stirring rod to move up and down, to improve the efficiency of agitating asphalt, and make the asphalt of upper and lower layers agitate together.

[0025] 3. The utility model discloses the upper end of heat preservation box body is equipped with scraping frame, and the scraping frame is rectangularly arranged, and the outside is close to the inside of heat preservation box body, and the inside of scraping frame is equipped with rotating screw rod, and the outside screw thread of rotating screw rod is engaged with the inside of scraping frame, and the lower end of rotating screw rod enters the inside of lower mounting bracket, and is engaged with the bevel gear on the drive rod, and the side of scraping frame outside close to the inner wall of box body is equipped with close plate, and the tangent plane of close plate is triangular, and the acute angle end faces downward, and one side of close plate is equipped with mounting block, and one end of mounting block enters the inside of scraping frame, and the side corresponding mounting block of the inside of scraping frame is equipped with spring, and can be close to the inner wall of heat preservation box body under the action of spring by close plate, to make close plate move downward when drive rod rotates and drives rotating screw rod to rotate, and scrape the asphalt on the inner wall with the acute angle end, to avoid the effect that asphalt adheres to the inner wall when discharging.

[0026] 4. The rotating push plate is installed on one side of the close-fitting plate, the rotating push plate is attached to the slope, and the upper end is L-shaped and bent into the close-fitting plate, the rotating push plate is provided with a rotating shaft at the upper end, a worm gear rod is installed in the close-fitting plate, one side of the worm gear rod is provided with a bevel gear, a space is provided in the close-fitting plate for the bevel gear to rotate, the rotating push rod is also provided with an extension rod, one end of the extension rod extends into the space where the bevel gear is installed, a spring is installed on one side of the extension rod, a screw head is installed at the upper end of the close-fitting plate, the screw head enters the close-fitting plate, a connecting rod is provided at the lower end of the screw head, a screw rod is provided at the bottom of the connecting rod and is engaged with the worm gear rod, so that during the process of keeping the asphalt warm, the scraping frame can also move downward in the asphalt, so that the screw head contacts the asphalt liquid medium, thereby driving the screw head to rotate, so that the screw rod at the bottom rotates and drives the bevel gear to rotate, thereby contacting the extension rod from one side, driving it to extrude the spring, and at the same time, the rotating push plate rotates outwardly by the rotating shaft, so that the asphalt with the highest temperature scraped from the inner wall of the box body is pushed to the inner side of the middle, then is stirred and mixed by the stirring rod, further ensuring the uniformity of heating and keeping warm in the box body, and avoiding large temperature difference in the asphalt. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the main view of the device heat preservation box body of the application;

[0028] Figure 2 It is the internal front perspective view of the heat preservation box of the application;

[0029] Figure 3 It is the internal front perspective view of the heat preservation box of the application; Figure 2 It is the enlarged view of A in the application;

[0030] Figure 4 It is the internal front perspective view of the heat preservation box of the application;

[0031] Figure 5 It is the enlarged view of B in the application; Figure 4

[0032] Figure 6 It is the perspective view of the stirring rod of the application;

[0033] Figure 7 It is the perspective view of the annular chute of the application;

[0034] Figure 8 It is the perspective view of the scraping frame of the application;

[0035] Figure 9 It is the principle diagram of the electric heating system of the heat conduction oil;

[0036] Figure 10 It is the flow chart of the electric heating system of the heat conduction oil;

[0037] Figures 1-10 ​The application relates to a heat preservation box, which comprises a heat preservation box main body, a charging door, a heat conduction oil layer, a heat preservation layer, a charging mechanism, a discharging auger, an upper mounting frame, an installation groove, an annular chute, a rotating rod, a moving slot, a stirring rod, a lower mounting frame, a driving rod, a bevel gear, a rotating screw, a scraping frame, an inner sleeve rod, a convex rod, a close plate, a spiral head, a connecting rod, a worm, a mounting block, a rotating push plate, a rotating shaft, an extension rod, a worm gear rod, an inclined wheel, a single transmission connecting piece. DETAILED DESCRIPTION

[0038] To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0040] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0041] In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0042] In the description of the present application, it is also necessary to explain that, unless otherwise explicitly specified and limited, if the terms "arrangement", "installation", "connection", "connection" appear, they should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] Please refer to Figures 1 to 10 A planar structure schematic diagram and a three-dimensional structure schematic diagram of an asphalt mixture circulating heating device.

[0044] An asphalt mixture circulating heating device, comprising a heat preservation box body 1, a loading door 101 is installed at the upper end of the heat preservation box body 1, a feeding mechanism 2 is installed on one side of the outer part of the heat preservation box body 1, the feeding mechanism 2 is connected with a lifting hopper through a winch, a steel wire rope and a connecting seat, and the device is loaded through the front part to send the material into the inside of the heat preservation box body 1, a heat conducting oil layer 102 and a heat preservation layer 103 are arranged in the inner wall of the heat preservation box body 1, the heat conducting oil layer 102 is connected with an external heat conducting oil electric heating system, an upper mounting bracket 4 and a lower mounting bracket 7 are installed at the middle end of the inside of the heat preservation box body 1, a driving rod 8 is installed in the inside of the lower mounting bracket 7, one end of the driving rod 8 extends outward and is connected with a driving motor, a rotating rod 5 is installed between the upper mounting bracket 4 and the lower mounting bracket 7, a stirring rod 6 is installed on the rotating rod 5, the stirring rod 6 is uniformly and equidistantly distributed on the outer side thereof, the lower end of the rotating rod 5 penetrates into the inside of the lower mounting bracket 4, a bevel gear 801 is installed on the outer side of the driving rod 8 corresponding to the lower end of the rotating rod 5, the bottom of the rotating rod 5 is engagedly connected with the bevel gear 801, and two of the rotating rods 5 are symmetrically arranged in the heat preservation box body 1.

[0045] In specific implementation, the upper end of the rotating rod 5 penetrates into the inside of the upper mounting bracket 4, the inside of the upper mounting bracket 4 is provided with a mounting groove 401, the inside of the rotating rod 5 is hollow, an inner sleeve rod 11 is installed in the inside of the rotating rod 5, the stirring rod 6 is fixedly connected with the outer side of the inner sleeve rod 11, the connecting position of the stirring rod 6 and the inner sleeve rod 11 on the rotating rod 5 is provided with a moving slot 501, the upper end of the inner sleeve rod 11 penetrates out of the inside of the rotating rod 5 and enters the mounting groove 401, the inner wall of the mounting groove 401 is provided with an annular inclined groove 402, the two sides of the annular inclined groove 402 are respectively arc-bent upward and downward, the outer side of the upper end of the inner sleeve rod 11 is provided with a convex rod 1101, and the outer end of the convex rod 1101 enters the annular inclined groove 402.

[0046] In a specific implementation, the upper end of the heat preservation box body 1 is provided with a scraping frame 10, which is rectangular and closely attached to the inner side of the heat preservation box body 1. A rotating screw rod 9 is arranged on the inner side of the scraping frame 10. The outer side of the rotating screw rod 9 is threadedly engaged with the inner side of the scraping frame 10. The lower end of the rotating screw rod 9 enters the inner part of the lower mounting bracket 7 and is engaged with the bevel gear 801 on the driving rod 8. The outer side of the scraping frame 10 is provided with a close plate 12 close to the inner wall of the box body. The cross section of the close plate 12 is triangular, and the acute angle end faces downward. The close plate 10 is provided with a mounting block 14 on one side, and one end of the mounting block 14 enters the inner part of the scraping frame 10. The inner part of the scraping frame 10 is provided with a spring on the side corresponding to the mounting block 14.

[0047] In a specific implementation, the side of the inclined surface of the close plate 12 is provided with a rotating push plate 15, which is attached to the inclined surface and the upper end is L-shaped and bent into the inner part of the close plate 12. The upper end of the rotating push plate 15 is provided with a rotating shaft 1501. The inner part of the close plate 12 is provided with a worm gear rod 16. The worm gear rod 16 is provided with a bevel gear 17 on one side. The inner part of the close plate 12 is provided with a space for the bevel gear 17 to rotate. The upper end of the rotating push plate 15 is further provided with an extension rod 1502, one end of which extends into the space where the bevel gear 17 is arranged. The extension rod 1502 is provided with a spring on one side. The upper end of the close plate 12 is provided with a screw head 13, which enters the inner part of the close plate 12. The lower end of the screw head 13 is provided with a connecting rod 1301, the bottom of which is provided with a screw rod 1302 and is engaged with the worm gear rod 16. The connecting rod 1301 is provided with a one-way transmission connecting piece 18. The bottom of the heat preservation box body 1 is provided with an outlet auger 3.

[0048] A method for circulating heating of asphalt mixture, the steps of which are as follows:

[0049] Firstly, the asphalt mixture is poured into the inner part of the heat preservation box body 1 by using the feeding mechanism, and then the feeding door is closed to reduce heat loss.

[0050] Secondly, the heated oil is sent into the inner part of the heat preservation box body 1 by connecting the external heat conduction oil electric heating system with the heat conduction oil layer 102.

[0051] Thirdly, the cooled oil is guided out and sent back to the inner part of the heat conduction oil heating system to be reheated, forming a circulating flow.

[0052] Fourthly, the inner part of the heat preservation box body 1 is provided with a rotating rod 5 and a stirring rod to stir the inner asphalt mixture to avoid heat accumulation on the inner wall.

[0053] Fifthly, the upper mounting bracket 4 is provided with a mounting groove 401, and the inner wall of the mounting groove 401 is provided with an annular inclined groove 402, so that the stirring rod 6 moves up and down to make the heat of the upper and lower layers of asphalt convect and exchange.

[0054] The sixth step is to move the scraping frame 10 downwards on the inner wall of the heat preservation box body 1 to avoid long-term adhesion of the asphalt on the inner wall;

[0055] The seventh step is to push the asphalt close to the inner wall to the middle by the rotating push plate 15 to ensure that the temperature inside the heat preservation box body 1 is uniform.

[0056] The asphalt mixture circulating heating method provided by the embodiment of the present application comprises the following steps.

[0057] The first step is to pour the asphalt mixture into the heat preservation box body 1 by using the feeding mechanism, and then close the feeding door to reduce heat loss.

[0058] The second step is to connect the external heat conducting oil electric heating system with the heat conducting oil layer 102, and send the heated oil into the heat preservation box body 1.

[0059] The third step is to guide the cooled oil out of the heat preservation box body 1 and send it back to the heat conducting oil heating system to be heated again to form a circulating flow.

[0060] The fourth step is to install the rotating rod 5 and the stirring rod in the heat preservation box body 1 to stir the internal asphalt mixture to avoid heat accumulation on the inner wall.

[0061] The fifth step is to use the installation groove 401 provided in the upper mounting frame 4, and the annular inclined groove 402 provided on the inner wall of the installation groove 401 to make the stirring rod 6 move up and down to make the heat of the upper and lower layers of the asphalt convect and exchange.

[0062] The sixth step is to move the scraping frame 10 downwards on the inner wall of the heat preservation box body 1 to avoid long-term adhesion of the asphalt on the inner wall.

[0063] The seventh step is to push the asphalt close to the inner wall to the middle by the rotating push plate 15 to ensure that the temperature inside the heat preservation box body 1 is uniform.

[0064] Before starting the heat conducting oil electric heating system, a comprehensive and detailed inspection needs to be carried out to ensure the safe and stable operation of the system. Since the asphalt has the characteristic of strong temperature sensitivity, its fluidity will change significantly with temperature. The sufficient amount and good quality of the heat conducting oil are the key to ensure the heat transfer efficiency. The liquid level of the heat conducting oil should be ensured to be within a reasonable range. If the liquid level is too low, the electric heater may be dry, which affects the service life of the equipment and even causes safety accidents. At the same time, it is necessary to check whether the heat conducting oil is deteriorated or has too much impurity. If so, it needs to be replaced in time to avoid affecting the heat transfer effect.

[0065] Check the sealing of each equipment connection. The heat transfer oil pump is driven by the motor to transport the heat transfer oil to each link, and the sealing of the pipeline, valve and equipment connection is very important. Once the leakage occurs, not only the waste of heat transfer oil will be caused, but also the pressure stability of the system will be affected, and then the heat preservation effect on asphalt will be affected.

[0066] Confirm the state of the heat preservation silo. Ensure that the heat transfer oil layer of the heat preservation silo is clean and unblocked, so that the heat transfer oil can circulate smoothly in it and fully play the heat preservation effect on asphalt. At the same time, check whether the heat preservation layer of the heat preservation box body is intact to reduce heat loss and meet the heat preservation characteristics of asphalt needing continuous and stable temperature environment.

[0067] Asphalt is easy to cool and gradually solidify at room temperature, and its viscosity increases with the decrease of temperature, so it is very important to keep the temperature of asphalt within a certain range. Too low temperature will cause asphalt to solidify, affect its fluidity, and then affect its transportation and use effect. Generally, the best temperature for asphalt heat preservation is between 160℃ and 180℃, and exceeding or below this range may affect its performance and fluidity.

[0068] When the system starts, the electric heater starts to heat the heat transfer oil, which is heated from room temperature (about 20-25℃) to the specified temperature (usually 180℃), and the power required for static heat transfer oil heating is calculated;

[0069] P = m * c * ΔT / t

[0070] Where: P is the heating power, in kilowatts (kW);

[0071] m is the mass of heat transfer oil, in kilograms (kg);

[0072] c is the specific heat capacity of the liquid, which is usually taken as 1.8-2.0 kilocalories per kilogram per degree Celsius (kcal / kg·℃) for petroleum products;

[0073] ΔT is the required temperature rise, i.e. the difference between the initial temperature and the target temperature, in degrees Celsius (℃);

[0074] t is the time required to reach the target temperature, in hours (h)

[0075] The heating element in the electric heater converts electrical energy into heat energy, gradually increasing the temperature of the heat transfer oil, and the temperature control system monitors the temperature of the heat transfer oil in real time to ensure that the heating speed is stable and avoid overheating or too fast heating. When the heat transfer oil reaches the specified temperature, it is continuously pumped into the heat transfer oil layer of the heat preservation box body under the action of the heat transfer oil pump.

[0076] The high-temperature heat-conducting oil entering the heat-conducting oil layer transmits heat to the bitumen in the bin through heat transfer, maintains the bitumen in a suitable temperature range, and meets the characteristics that the viscosity of the bitumen changes greatly with temperature and the bitumen needs to be kept at a certain temperature to ensure fluidity. With the transmission of heat, the temperature of the heat-conducting oil gradually decreases, and the heat-conducting oil after the temperature decreases is extracted from the heat-conducting oil layer of the bin and then enters the electric heater again to be heated and warmed. Such a process is repeated to form a continuous and stable cycle, so that the bitumen in the heat-insulating bin is always kept in a heat-insulating temperature environment required.

[0077] In the case of fluid flow, the heat transfer rate increases, so the flow rate and temperature difference need to be introduced when calculating;

[0078] P = C_f * m_dot * DeltaT / t

[0079] Wherein: Cf is the heat transfer coefficient, which is related to the flow rate, pipe diameter, pipe material, fluid properties, etc.

[0080] m_dot is the mass flow rate of the fluid, and the unit is kilogram per second (kg / s) or kilogram per hour (kg / h);

[0081] DeltaT is also the temperature difference between the inlet and outlet of the system, and the unit is Celsius (℃);

[0082] t still represents the time required to heat the fluid to the target temperature;

[0083] During the heat transfer process, the temperature of the heat-conducting oil will gradually decrease. In particular, after a certain period of time, the temperature of the heat-conducting oil may decrease below the set minimum return temperature (such as 160℃), and the low-temperature heat-conducting oil is extracted through the heat-conducting oil pump and sent back to the electric heater for heating, so that the temperature of the heat-conducting oil is always maintained within the optimal heating range (usually 160-180℃).

[0084] This process continuously heats and circulates the heat-conducting oil to maintain the constant temperature of the bitumen, and when the temperature of the heat-conducting oil exceeds the set safe temperature range (such as the temperature exceeds 190℃), the temperature control system automatically cuts off the power supply of the electric heater to prevent overheating, and the system will prompt through an alarm device.

[0085] Working principle

[0086] The working principle of the bitumen mixture circulating heating device and method provided by the embodiment of the application is as follows.

[0087] Firstly, through the heat preservation box main body 1 inside the middle end installation has the upper mounting bracket 4 and the lower mounting bracket 7, the lower mounting bracket 7 inside installation has the drive rod 8, the drive rod 8 one end extends outward and is connected with the drive motor, the upper mounting bracket 4 and the lower mounting bracket 7 between installation has the rotary rod 5, the rotary rod 5 on installation has the stirring rod 6, the stirring rod 6 on its outside even equidistance distribution, the rotary rod 5 lower end enters the lower mounting bracket 4 inside, the drive rod 8 outside corresponding the lower end of rotary rod 5 installation has the bevel gear 801, the rotary rod 5 bottom and bevel gear 801 engagement connection, the rotary rod 5 in the heat preservation box main body 1 symmetry and is provided with two, when the drive rod 8 is driven under the drive of external motor and rotates, can through bevel gear 801 drive rotary rod 5 and stirring rod 6 to rotate, further drive inside bitumen to rotate and agitate, constantly change bitumen in the heat preservation box main body 1 inside the position, to avoid heat accumulation in the heat preservation box main body 1 inside and cannot be conducted to the inside, then through the rotary rod 5 upper end enters the upper mounting bracket 4 inside, the upper mounting bracket 4 inside is provided with installation slot 401, the rotary rod 5 inside is hollow and is provided, the rotary rod 5 inside installation has the inner sleeve rod 11, the stirring rod 6 and the inner sleeve rod 11 outside fixed connection, the rotary rod 5 on corresponding the stirring rod 6 and the inner sleeve rod 11 connection place is provided with the movement slot 501, the inner sleeve rod 11 upper end enters the installation slot 401 in the rotary rod 5 inside, the installation slot 401 inner wall is equipped with annular chute 402, annular chute 402 both sides are respectively upwards and downwards arc bending, the inner sleeve rod 11 upper end outside is provided with convex rod 1101, convex rod 1101 outer end enters annular chute 402, then when the rotary rod 5 rotates, can drive inner sleeve rod 11 in installation slot 401 rotates, further drive convex rod 1101 along the shape of annular chute 402 moves up and down, further drive inner sleeve rod 11 and stirring rod 6 moves up and down, to reach the efficiency of agitating bitumen, make the bitumen of upper and lower layer agitates together, after that, through the heat preservation box main body 1 inside upper end installation has the scraping frame 10, the scraping frame 10 is rectangular and is provided, and the outside is close to the heat preservation box main body 1 inside, the scraping frame 10 inside installation has the rotating screw 9, the rotating screw 9 outside thread and scraping frame 10 inside engagement, the rotating screw 9 lower end enters the lower mounting bracket 7 inside, and with the bevel gear 801 on drive rod 8 engagement connection, the scraping frame 10 outside close to the box body inner wall one side installation has the close plate 12, the close plate 12 section is triangular, and the acute angle end faces down, the close plate 10 one side is provided with the mounting block 14, and the mounting block 14 one end enters the scraping frame 10 inside, the scraping frame 10 inside corresponding the one side of mounting block 14 is equipped with spring, then can use close plate 12 under the action of spring and the heat preservation box main body 1 inner wall close, to when drive rod 8 rotates and drives rotating screw 9 to rotate, can drive close plate 12 to move down, use the acute angle end to scrape the bitumen on the inner wall, reach the effect of avoiding bitumen to adhere to the inner wall when discharging, finally through the close plate 12 inclined plane one side installation has the rotary push plate 15, the rotary push plate 15 and the inclined plane are fitted, and the upper end is L-shaped and is bent into the close plate 12 inside,The upper end of the rotating push plate 15 is provided with a rotating shaft 1501, the inside of the plate 12 is provided with a worm gear rod 16, one side of the worm gear rod 16 is provided with a bevel gear 17, the inside of the plate 12 is provided with a space for the bevel gear 17 to rotate, the upper end of the rotating push rod 15 is further provided with an extension rod 1502, one end of the extension rod 1502 extends into the space where the bevel gear 17 is installed, one side of the extension rod 1502 is provided with a spring, the upper end of the plate 12 is provided with a spiral head 13, the lower end of the spiral head 13 enters the inside of the plate 12, the lower end of the spiral head 13 is provided with a connecting rod 1301, the bottom of the connecting rod 1301 is provided with a screw rod 1302, and is engagedly connected with the worm gear rod 16, so that in the process of heating and keeping the asphalt, the scraping frame 10 can also move downward in the asphalt, so that the spiral head 13 is in contact with the asphalt liquid medium, so as to drive the spiral head 13 to rotate, so that the screw rod 13 at the bottom rotates to drive the bevel gear 17 to rotate, and then contacts the extension rod 1502 from one side, drives the extension rod 1502 to extrude the spring, and at the same time, the rotating push plate 15 rotates outwardly by the rotating shaft 1501, so that the asphalt with the highest temperature scraped from the inner wall of the box is pushed to the middle of the inside, and then is stirred and mixed by the stirring rod 6, further ensuring that the heating and keeping of the box are uniform, and avoiding that the temperature difference in the asphalt is large.

[0088] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A bituminous mixture circulating heating device comprising an insulating box body (1), characterized in that: The upper end of the heat preservation box body (1) is provided with a loading door (101), the outer side of the heat preservation box body (1) is provided with a feeding mechanism (2), the inner wall of the heat preservation box body (1) is provided with a heat conducting oil layer (102) and a heat preservation layer (103), the middle end of the inside of the heat preservation box body (1) is provided with an upper mounting frame (4) and a lower mounting frame (7), a rotating rod (5) is arranged between the upper mounting frame (4) and the lower mounting frame (7), the rotating rod (5) is provided with a stirring rod (6), the stirring rod (6) is uniformly and equidistantly distributed on the outer side thereof, the lower end of the rotating rod (5) penetrates into the inside of the lower mounting frame (4), the upper end of the rotating rod (5) penetrates into the inside of the upper mounting frame (4), the inside of the upper mounting frame (4) is provided with a mounting groove (401), the inside of the rotating rod (5) is hollow, the inside of the rotating rod (5) is provided with an inner sleeve rod (11), the upper end of the inside of the heat preservation box body (1) is provided with a scraping frame (10), the scraping frame (10) is provided in a rectangular shape and closely attached to the inside of the heat preservation box body (1), the side of the outer side of the scraping frame (10) close to the inner wall of the box body is provided with a close plate (12), the tangent plane of the close plate (12) is triangular, and the acute angle end faces downward, the side of the inclined surface of the close plate (12) is provided with a rotating push plate (15), the rotating push plate (15) is attached to the inclined surface, and the upper end is L-shaped and bent into the inside of the close plate (12), the bottom of the heat preservation box body (1) is provided with a discharging auger (3).

2. The asphalt mixture circulating heating device according to claim 1, characterized in that: The stirring rod (6) and the inner sleeve rod (11) are fixedly connected on the outer sides thereof, the rotating rod (5) is provided with a moving slot (501) corresponding to the connection positions of the stirring rod (6) and the inner sleeve rod (11) on the upper end thereof, and the upper end of the inner sleeve rod (11) penetrates out of the inside of the rotating rod (5) and enters the mounting groove (401).

3. The asphalt mixture circulating heating device according to claim 1, characterized in that: The upper end of the rotating push plate (15) is provided with a rotating shaft (1501), the inside of the close plate (12) is provided with a worm rod (16), one side of the worm rod (16) is provided with a bevel gear (17), and the upper end of the close plate (12) is provided with a screw head (13).

4. The asphalt mixture circulating heating device according to claim 3, characterized in that: The lower end of the screw head (13) enters the inside of the close plate (12), the lower end of the screw head (13) is provided with a connecting rod (1301), the bottom of the connecting rod (1301) is provided with a screw rod (1302) and is engagedly connected with the worm rod (16).

5. The asphalt mixture circulating heating device according to claim 1, characterized in that: The inside of the lower mounting frame (7) is provided with a driving rod (8), one end of the driving rod (8) extends outward and is connected with a driving motor, the outer side of the driving rod (8) is provided with a bevel gear (801) corresponding to the lower end of the rotating rod (5), and the bottom of the rotating rod (5) is engagedly connected with the bevel gear (801).

6. The asphalt mixture circulating heating device according to claim 1, characterized in that: The inner wall of the mounting groove (401) is provided with an annular inclined groove (402), the two sides of the annular inclined groove (402) are respectively arc-shaped and curved upward and downward, the outer side of the upper end of the inner sleeve rod (11) is provided with a convex rod (1101), and the outer end of the convex rod (1101) enters the annular inclined groove (402).

7. The asphalt mixture circulating heating device according to claim 1, characterized in that: The scraping frame (10) is internally provided with a rotating screw rod (9), the outer side of the rotating screw rod (9) is threadedly engaged with the inner side of the scraping frame (10), the lower end of the rotating screw rod (9) enters the inside of the lower mounting frame (7) and is engagedly connected with the bevel gear (801) on the driving rod (8).

8. The asphalt mixture circulating heating device according to claim 1, characterized in that: The inner side of the close-to-board (12) is provided with a space for the rotation of the oblique wheel (17), the upper end of the rotating push rod (15) is further provided with an extension rod (1502), one end of the extension rod (1502) extends into the space for the installation of the oblique wheel (17), and the extension rod (1502) is provided with a spring on one side.

9. The asphalt mixture circulating heating method according to any one of claims 1 to 8, wherein The method comprises the following steps: In the first step, the asphalt mixture is poured into the inside of the heat preservation box body (1) by using the feeding mechanism, and then the loading door is closed to reduce heat loss; In the second step, the heated oil liquid is sent into the inside of the heat preservation box body (1) by connecting the external heat conduction oil electric heating system with the heat conduction oil layer (102); In the third step, the cooled oil liquid is guided out and sent back to the inside of the heat conduction oil heating system to be reheated, forming a circulating flow; In the fourth step, the inside of the heat preservation box body (1) is provided with a rotating rod (5) and a stirring rod, which are used to stir the internal asphalt mixture to avoid heat accumulation on the inner wall; In the fifth step, the upper mounting frame (4) is provided with an installation groove (401), and the inner wall of the installation groove (401) is provided with an annular inclined groove (402), so that the stirring rod (6) moves up and down to make the heat of the upper and lower layers of the asphalt convect; In the sixth step, the scraping frame (10) moves downward on the inner wall of the heat preservation box body (1) to avoid long-term adhesion of the asphalt to the inner wall; In the seventh step, the rotating push plate (15) is used to push the asphalt close to the inner wall to the middle part to ensure that the temperature inside the heat preservation box body (1) is uniform.

Images