Energy-saving heating device for asphalt mixture

Abstract

The utility model discloses an asphalt mixture energy -conserving heating device relates to asphalt production equipment technical field, and the utility model discloses a kind of asphalt mixing box, the top of asphalt mixing box is equipped with heat recovery mechanism, for recycling and utilizing the waste heat generated when preparing, heat recovery mechanism includes: preheating component includes the conveying pipe fixedly installed in asphalt mixing box top one side, conveying pipe's outside fixed mounting has shell, the waste gas generated by the asphalt mixing box heating mixture in the application, into the cavity formed by fixed cover and rotating cover by air inlet pipe, by the delivery of pipe its waste gas afterheat can effectively heat conveying pipe, and the afterheat of waste gas is preheated when mixture is conveyed in conveying pipe, to reutilize originally discarded heat, reduce the energy consumption required for subsequent asphalt mixing box to heat mixture, reduce energy consumption in production process, significantly improve energy utilization efficiency, save production cost.

Description

Technical Field

[0001] This utility model relates to the technical field of asphalt production equipment, specifically to an energy-saving heating device for asphalt mixtures. Background Technology

[0002] Asphalt mixture is a composite material made by mixing asphalt (petroleum asphalt or modified asphalt), aggregates (coarse aggregates, fine aggregates, mineral powder) and additives (such as anti-stripping agents, fibers, etc.) in a certain proportion. The asphalt (binder) is heated to a fluid state (usually 150-180℃) to facilitate uniform mixing with aggregates for use.

[0003] Referring to the patent document: Patent Publication No. CN222685177U, Patent Publication Date 2025-03-28, a heating energy-saving device for asphalt mixture is disclosed, including an asphalt heating box. A longitudinally movable heat transfer conduit is horizontally arranged inside the asphalt heating box. A heat transfer medium inlet and an outlet are respectively provided at both ends of the heat transfer conduit. A retractable heat transfer medium inlet assembly connected to the heat transfer medium inlet and a retractable heat transfer medium outlet assembly connected to the heat transfer medium outlet are provided on the upper surface of the asphalt heating box. Longitudinal displacement components for longitudinally moving the heat transfer conduit are symmetrically arranged at the left and right ends of the asphalt heating box. When the heat transfer oil heated by the heat transfer oil furnace passes through the inside of the heat transfer conduit, it can indirectly heat the asphalt. By providing longitudinal displacement components on the asphalt heating box for longitudinally moving the heat transfer conduit, the heat transfer conduit can move up and down during heat exchange with the asphalt, achieving heat exchange with the asphalt above the inside of the asphalt heating box, improving the uniformity of indirect heating of the asphalt, avoiding localized heating of the bottom of the asphalt, and having certain energy-saving advantages.

[0004] Based on the search of patent numbers and the shortcomings of existing technologies, the following was found:

[0005] Existing asphalt mixture heating equipment, while emitting asphalt mixtures into the atmosphere after preliminary treatment such as dust removal and desulfurization, does not effectively recover and utilize the large amount of sensible and latent heat contained therein. Specifically, the temperature of the high-temperature exhaust gas discharged from the heating device can typically reach 150℃-300℃. If this heat could be recovered and utilized, it could significantly reduce the energy consumption of subsequent production processes. However, most traditional equipment only focuses on the removal of pollutants from the exhaust gas and directly discharges the purified exhaust gas, resulting in a large amount of heat energy carried in the exhaust gas being lost during the emission process.

[0006] Therefore, this utility model provides an energy-saving heating device for asphalt mixtures. Utility Model Content

[0007] In order to address the problem that most existing asphalt mixture heating equipment focuses on the treatment of exhaust gas pollutants, but a large amount of heat in the emitted high-temperature exhaust gas of 150-300℃ is not recovered and utilized, resulting in energy waste, the purpose of this utility model is to provide an energy-saving heating device for asphalt mixtures.

[0008] To achieve the above objectives, this utility model provides the following technical solution: an energy-saving heating device for asphalt mixtures, comprising an asphalt mixing tank, wherein a heat recovery mechanism is provided at the top of the asphalt mixing tank for recovering and utilizing the waste heat generated during its preparation. The heat recovery mechanism includes:

[0009] The preheating assembly includes a conveying pipe fixedly installed on one side of the top of the asphalt mixing tank. An outer shell is fixedly installed on the outside of the conveying pipe. A spiral conveying blade is provided in the middle of the conveying pipe. A drive motor is provided in the middle of the top of the conveying pipe. The top of the spiral conveying blade is fixedly installed on the drive end of the drive motor. A base is fixedly installed on the other side of the top of the asphalt mixing tank. A fixed cover is fixedly installed on the top of the base. A rotating cover is rotatably installed on one side of the middle of the fixed cover. A guide tube is fixedly installed in the middle of the top of the fixed cover. The other end of the guide tube is fixedly installed on the top of the outer shell. Two symmetrically distributed air inlet pipes are fixedly installed at the bottom of one side of the fixed cover. The bottom ends of the two air inlet pipes are both fixedly installed on one side of the top of the asphalt mixing tank.

[0010] The cleaning component, located in the middle of the rotating hood, is used to filter impurities in the recovered hot air.

[0011] Preferably, a coarse dustproof net is detachably installed in the middle of the rotating cover, a pleated filter element is detachably installed in the middle of the coarse dustproof net, the middle of the pleated filter element is connected to the conduit, a driven gear is fixedly installed in the middle of the bottom end of the rotating cover, and a drive component is provided on one side of the driven gear.

[0012] Preferably, a hopper is fixedly installed at the top of the conveying pipe, and the hopper has an inverted conical structure.

[0013] Preferably, a mounting plate is fixedly installed at the top of the hopper, and a drive motor is fixedly installed at the middle of the top of the mounting plate.

[0014] Preferably, an exhaust pipe is fixedly installed on one side of the lower part of the outer casing, and the exhaust end of the exhaust pipe is connected to the input end of the external air purification device.

[0015] Preferably, the drive assembly includes a servo motor fixedly installed on one side of the middle of the base, and a drive gear is fixedly installed on the drive end of the servo motor, with the drive gear and the driven gear meshing with each other.

[0016] Beneficial effects

[0017] This invention provides an energy-saving heating device for asphalt mixtures. Compared with the prior art, it has the following advantages:

[0018] 1. This application enables the waste gas generated by heating the mixture in the asphalt mixing tank to enter the cavity composed of the fixed cover and the rotating cover through the air inlet pipe. After filtration, it enters the cavity between the outer shell and the outer wall of the conveying pipe through the conduit. The residual heat of the waste gas can effectively heat the conveying pipe. At the same time, the drive motor drives the spiral conveyor blade to rotate, which transports the mixture to the asphalt mixing tank through the conveying pipe. The mixture is preheated by the residual heat of the waste gas when it is transported in the conveying pipe, thereby reusing the originally wasted heat, reducing the energy consumption required for subsequent heating of the mixture in the asphalt mixing tank, reducing energy consumption in the production process, significantly improving energy utilization efficiency, and saving production costs.

[0019] 2. The coarse dustproof net and pleated filter element set in the middle of the rotating cover in this application can perform graded filtration of impurities in the recovered hot air. The coarse dustproof net intercepts large particles of impurities, and the multi-layer composite filter material of the pleated filter element can adsorb fine dust and harmful gases, ensuring that the gas entering the outer shell is clean and preventing impurities from clogging the conveying pipe or affecting the heat exchange effect. When the filter screen and filter element become clogged due to long-term use, the driven gear driven by the servo motor can rotate the rotating cover 180 degrees, exposing the coarse dustproof net and pleated filter element for easy cleaning or replacement, maintaining the filtration effect, ensuring the continuous and stable operation of the heat recovery device, extending the service life of the device, and reducing equipment maintenance costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a schematic cross-sectional view of the preheating component of this utility model.

[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of the fixing cover of this utility model.

[0023] Figure 4 This is a schematic diagram of the connection structure between the servo motor and the drive gear in this utility model.

[0024] Figure 5 This is a schematic diagram of the structure after the fixed cover and the rotating cover are separated in this utility model.

[0025] In the diagram: 1. Asphalt mixing bin; 2. Heat recovery mechanism; 21. Preheating component; 211. Outer shell; 2111. Exhaust pipe; 212. Conveying pipe; 213. Screw conveyor blade; 214. Hopper; 215. Drive motor; 2151. Mounting plate; 216. Fixing cover; 2161. Base; 217. Rotating cover; 218. Conduit; 219. Air inlet pipe; 22. Cleaning component; 221. Coarse dustproof net; 222. Pleated filter element; 223. Servo motor; 224. Drive gear; 225. Driven gear. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-5 This utility model provides a technical solution: an energy-saving heating device for asphalt mixtures, including an asphalt mixing tank 1, with a heat recovery mechanism 2 at the top of the asphalt mixing tank 1 for recovering and utilizing the waste heat generated during its preparation. The heat recovery mechanism 2 includes:

[0028] The preheating assembly 21 includes a conveying pipe 212 fixedly installed on one side of the top of the asphalt mixing bin 1. The conveying pipe 212 is made of high-temperature resistant, thermally conductive stainless steel, and its inner wall is specially polished to effectively reduce the adhesion of the mixture during the conveying process and reduce the conveying resistance. An outer shell 211 is fixedly installed on the outside of the conveying pipe 212. The outer shell 211 is made of ceramic fiber composite material with excellent heat insulation performance, which can prevent heat loss and ensure the safety of operators. A spiral conveying blade 213 is provided in the middle of the conveying pipe 212. The spiral conveying blade 213 adopts a variable pitch design. The pitch is smaller at the end near the hopper 214, which can perform preliminary compaction and pushing of the mixture. The pitch gradually increases at the end away from the hopper 214, which is conducive to the uniform heating of the mixture during the conveying process. A drive motor 215 is provided at the top middle of the conveying pipe 212. The top of the spiral conveying blade 213 is fixedly installed on the drive end of the drive motor 215. The MY series single-phase asynchronous motor is used, and the speed of the screw conveyor blade 213 can be flexibly adjusted according to actual production needs. A base 2161 is fixedly installed on the other side of the top of the asphalt mixing box 1. A fixed cover 216 is fixedly installed on the top of the base 2161. A rotating cover 217 is rotatably installed on one side of the middle of the fixed cover 216. A conduit 218 is fixedly installed on the middle of the top of the fixed cover 216. The other end of the conduit 218 is fixedly installed on the top of the outer shell 211. The conduit 218 is installed in a ring structure at one end of the outer shell 211. Multiple air inlet channels are provided at the bottom of the ring structure so that hot air can enter the outer shell 211 evenly. Two symmetrically distributed air inlet pipes 219 are fixedly installed on the bottom of one side of the fixed cover 216. The bottom ends of the two air inlet pipes 219 are fixedly installed on the top side of the asphalt mixing box 1. A backfire prevention device is provided at the air inlet of the air inlet pipe 219 to effectively prevent flame backflow in the asphalt mixing box 1.

[0029] The cleaning component 22, located in the middle of the rotating shroud 217, is used to filter impurities in the recovered hot air.

[0030] A coarse dustproof net 221 is detachably installed in the middle of the rotating cover 217. The coarse dustproof net 221 is made of woven metal wire mesh, which can effectively intercept large particulate impurities while ensuring the passage of gas. A pleated filter element 222 is detachably installed in the middle of the coarse dustproof net 221. The pleated filter element 222 uses multi-layer composite filter material, including a pre-filter layer, an activated carbon adsorption layer and a high-efficiency filter layer, which can adsorb and filter fine dust and harmful gases in hot air. The middle of the pleated filter element 222 is connected to the conduit 218. A driven gear 225 is fixedly installed in the middle of the bottom end of the rotating cover 217. A drive component is provided on one side of the driven gear 225.

[0031] A hopper 214 is fixedly installed at the top of the conveying pipe 212, and the hopper 214 has an inverted conical structure. This structure can effectively prevent the mixture from accumulating and clogging in the hopper 214.

[0032] A mounting plate 2151 is fixedly installed on the top of the hopper 214, and a drive motor 215 is fixedly installed in the middle of the top of the mounting plate 2151. A shock-absorbing rubber pad is provided between the mounting plate 2151 and the hopper 214 to reduce the transmission of vibration generated by the drive motor 215 during operation.

[0033] An exhaust pipe 2111 is fixedly installed on one side of the lower part of the outer casing 211. The exhaust end of the exhaust pipe 2111 is connected to the input end of the external air purification device. A flow control valve and a temperature sensor are installed on the exhaust pipe 2111, which can monitor the exhaust flow and the temperature inside the outer casing 211 in real time.

[0034] The drive assembly includes a servo motor 223 fixedly mounted on one side of the middle of the base 2161. The drive end of the servo motor 223 is fixedly mounted with a drive gear 224, which meshes with the driven gear 225. The servo motor 223 is a three-phase permanent magnet synchronous motor of model HC20220325, equipped with a high-precision encoder, which can stably control the rotation angle and speed of the rotating cover 217, ensuring that the replacement operation of the coarse dustproof net 221 and the pleated filter element 222 is accurate.

[0035] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0036] During operation, the asphalt mixture entering the asphalt mixing tank 1 is heated to prepare a usable asphalt mixture. At the same time, the exhaust gas generated during heating enters the sealed cavity formed by the fixed cover 216 and the rotating cover 217 through the air inlet pipe 219. The gas first passes through the coarse dustproof net 221 to filter out large particulate impurities in the gas, and then passes through the pleated filter element 222 to adsorb and filter out fine dust. The gas enters the middle of the pleated filter element 222 through the conduit 218 connected to it and enters the cavity formed by the outer wall of the outer shell 211 and the outer wall of the conveying pipe 212. The residual heat of the gas heats the conveying pipe 212. Finally, the gas is discharged through the exhaust pipe 2111 on the lower side of the outer shell 211.

[0037] While the asphalt mixing box 1 is working, the drive motor 215 drives the spiral conveyor blade 213 to rotate synchronously, so that it can convey the mixture entering the hopper 214. During the conveying process, since the mixture needs to pass through the conveying pipe 212, the material being conveyed can be preheated.

[0038] Under prolonged use, the servo motor 223 can drive the drive gear 224 to rotate, causing the meshing driven gear 225 to rotate, thereby driving the rotating cover 217 to rotate. After rotating 180 degrees, the outer wall of the rotating cover 217 comes into contact with the inner wall of the fixed cover 216. At this time, the coarse dustproof net 221 and the pleated filter element 222 are exposed and can be cleaned or disassembled and replaced. After the cleaning is completed, the servo motor 223 can reverse the drive to reset the rotating cover 217.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving heating device for asphalt mixtures, comprising an asphalt mixing tank (1), characterized in that: The top of the asphalt mixing tank (1) is equipped with a heat recovery mechanism (2) for recovering and utilizing the waste heat generated during its preparation. The heat recovery mechanism (2) includes: The preheating assembly (21) includes a conveying pipe (212) fixedly installed on one side of the top of the asphalt mixing tank (1). A housing (211) is fixedly installed on the outside of the conveying pipe (212). A spiral conveying blade (213) is provided in the middle of the conveying pipe (212). A drive motor (215) is provided in the middle of the top of the conveying pipe (212). The top of the spiral conveying blade (213) is fixedly installed on the drive end of the drive motor (215). A base (2161) is fixedly installed on the other side of the top of the asphalt mixing tank (1). A fixed cover (216) is fixedly installed at the top of the seat (2161). A rotating cover (217) is rotatably installed on one side of the middle part of the fixed cover (216). A conduit (218) is fixedly installed at the middle of the top of the fixed cover (216). The other end of the conduit (218) is fixedly installed at the top of the outer shell (211). Two symmetrically distributed air inlet pipes (219) are fixedly installed at the bottom of one side of the fixed cover (216). The bottom ends of the two air inlet pipes (219) are fixedly installed on one side of the top of the asphalt mixing box (1). A cleaning component (22) is located in the middle of the rotating shroud (217) and is used to filter impurities in the recovered hot air.

2. The energy-saving heating device for asphalt mixture according to claim 1, characterized in that: A coarse dustproof net (221) is detachably installed in the middle of the rotating cover (217), and a pleated filter element (222) is detachably installed in the middle of the coarse dustproof net (221). The middle of the pleated filter element (222) is connected to the conduit (218). A driven gear (225) is fixedly installed in the middle of the bottom end of the rotating cover (217), and a drive assembly is provided on one side of the driven gear (225).

3. The energy-saving heating device for asphalt mixture according to claim 1, characterized in that: The top end of the conveying pipe (212) is fixedly equipped with a hopper (214), and the hopper (214) has an inverted conical structure.

4. The energy-saving heating device for asphalt mixture according to claim 3, characterized in that: The top of the hopper (214) is fixedly mounted with an mounting plate (2151), and the drive motor (215) is fixedly mounted in the middle of the top of the mounting plate (2151).

5. The energy-saving heating device for asphalt mixture according to claim 1, characterized in that: An exhaust pipe (2111) is fixedly installed on one side of the lower part of the outer casing (211), and the exhaust end of the exhaust pipe (2111) is connected to the input end of the external air purification device.

6. The energy-saving heating device for asphalt mixture according to claim 2, characterized in that: The drive assembly includes a servo motor (223) fixedly installed on one side of the middle of the base (2161). The drive end of the servo motor (223) is fixedly installed with a drive gear (224), and the drive gear (224) and the driven gear (225) are meshed and connected to each other.

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