Preparation system and method of rock asphalt powder
By using a cold air unit and refrigeration system in the rock asphalt powder preparation system to cool the gas split impact mill at low temperature, the problem of rapid cooling of the grinding equipment was solved, product quality and equipment life were improved, and production costs were reduced.
Patent Information
- Application Number
- CN202610057620.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-16
- Publication Date
- 2026-03-17
AI Technical Summary
In the process of preparing rock asphalt powder, existing technologies make it difficult to rapidly cool down the grinding equipment, resulting in uneven product particle size and accelerated equipment wear, which increases production costs.
The system uses a cold air unit to deliver low-temperature cold air into the cooling chamber of the gas-distribution impact mill. Combined with the refrigeration system and temperature controller, it achieves rapid and uniform cooling and avoids overheating of the equipment.
It achieves rapid and uniform cooling, ensuring product quality stability, reducing equipment wear, and lowering production costs.
Smart Images
Figure CN121669385A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of asphalt preparation technology, and specifically to a system and method for preparing rock asphalt powder. Background Technology
[0002] Rock asphalt, as a high-quality natural asphalt material, is widely used in road construction and other fields. However, the ultrafine grinding process of rock asphalt generates a large amount of heat. If the grinding equipment is not cooled in a timely and effective manner, it will not only affect the grinding quality of the rock asphalt, leading to problems such as uneven particle size, but also accelerate the wear of the grinding equipment, shorten its service life, and increase production costs.
[0003] Currently, most cooling methods for grinding equipment used in the preparation of rock asphalt powder involve circulating water cooling. While this can reduce the equipment temperature to some extent, the large and uneven heat generated during grinding makes it difficult for circulating water cooling to remove the heat quickly and evenly. This can lead to changes in the material's properties due to the high-temperature environment during grinding. Summary of the Invention
[0004] The purpose of this invention is to solve the technical problem of the difficulty in rapidly cooling the grinding equipment during the preparation of rock asphalt powder, and to provide a method for preparing rock asphalt.
[0005] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows: A rock bitumen powder preparation system includes a pulverizing section, a dehydration section, a grinding section and a finished product section connected in sequence; The crushing section includes an alligator crusher with a feeding hopper, a double-stage crusher, and a drum screen; the feed inlet of the double-stage crusher is connected to the discharge outlet of the alligator crusher, the discharge outlet of the double-stage crusher is connected to the feed inlet of the drum screen, and the secondary crushing discharge outlet of the drum screen is connected to the feed inlet of the double-stage crusher. The dehydration section includes a drum dryer whose feed end is connected to the screening outlet of the drum screener; The grinding section includes a gas-diverting impact mill whose feed inlet is connected to the discharge end of the drum dryer, and a cold air unit is provided between the air inlet and the air outlet of the cooling chamber of the gas-diverting impact mill. The finished product section includes a screw feeder whose inlet is connected to the outlet of the gas splitting impact mill, and a finished product storage tank located at the outlet of the screw feeder.
[0006] Furthermore, the air cooling unit includes an air duct, an exhaust fan is provided at the air inlet of the air duct, the air outlet of the air duct is connected to the air inlet of the cooling chamber of the gas splitting impact mill through a cold air delivery pipe, and a hot air exhaust system is provided at the air outlet of the cooling chamber of the gas splitting impact mill. The duct is equipped with multiple evaporators arranged in sequence inside, and a refrigeration system connected to the evaporators is provided outside the duct. The outside gas exchanges heat with the low-pressure, low-temperature gas-liquid mixture refrigerant in multiple evaporators in sequence to obtain low-temperature gas.
[0007] Furthermore, the refrigeration system includes an expansion valve, a condenser, and a compressor connected in series between the liquid inlet and liquid outlet of the evaporator; The compressor compresses the low-pressure, low-temperature gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant, which is then sent to the condenser. The high-temperature, high-pressure gaseous refrigerant exchanges heat with the outside environment through the condenser and condenses into a high-pressure, room-temperature liquid refrigerant. The high-pressure, room-temperature liquid refrigerant passes through the expansion valve to form a low-pressure, low-temperature gas-liquid mixture. The low-pressure, low-temperature gas-liquid mixture exchanges heat with the gas entering the duct in the evaporator to form a low-pressure, low-temperature gaseous refrigerant, which then re-enters the compressor.
[0008] Furthermore, a liquid receiver and a filter are sequentially provided between the refrigerant outlet of the condenser and the refrigerant inlet of the expansion valve.
[0009] Furthermore, it also includes a thermostat that is electrically connected to the exhaust fan, hot air extraction system, and compressor; The gas diversion impact mill is equipped with a temperature sensor, which is electrically connected to a temperature controller. The temperature controller controls the operation and temperature adjustment of the exhaust fan, hot air extraction system, and compressor through the temperature signal collected by the temperature sensor.
[0010] Furthermore, it also includes a power supply, with the exhaust fan, hot air extraction system, compressor, and thermostat all connected to the power supply.
[0011] Furthermore, it also includes dust removal equipment connected to rotary drum dryers, gas-distribution impact mills, screw feeders, and finished product storage tanks.
[0012] Furthermore, sealed belt conveyors are provided between the feed inlet of the double-stage crusher and the discharge outlet of the alligator crusher, between the discharge outlet of the double-stage crusher and the feed inlet of the drum screen, between the secondary crushing discharge outlet of the drum screen and the feed inlet of the double-stage crusher, and between the discharge end of the drum dryer and the feed inlet of the gas diversion impact mill.
[0013] A method for preparing rock bitumen powder includes the following steps: S1. The rock asphalt ore with a particle size of 2-40cm is fed into the jaw crusher through the feeding hopper. The jaw crusher performs primary crushing and crushes it to a particle size of less than 200mm. S2, the double-stage crusher performs secondary crushing on rock asphalt ore with a particle size of less than 200mm after the primary crushing. After crushing, the raw rock asphalt ore with a particle size greater than 3mm is screened by a drum screener. The raw rock asphalt ore with a particle size of less than or equal to 3mm is fed back into the double-stage crusher, while the powder with a particle size of less than or equal to 3mm is fed into the drum dryer. S3, the drum dryer dries powder with a particle size of 3mm or less at a temperature of 60-80℃ for 15 minutes, so that the moisture content of the powder is less than 1%; S4. After the dried powder is cooled to room temperature, it is transported to the gas split impact mill. At the same time, -35°C cold air is delivered to the cooling chamber of the gas split impact mill through the cold air unit. The gas split impact mill grinds powder with a particle size of less than or equal to 3 mm in a cooling environment of -35℃ to obtain powder with a fineness of 100 mesh. S5. After grinding, the powder with a fineness of 100 mesh is conveyed to the finished product storage tank by a screw feeder to complete the preparation of rock asphalt powder.
[0014] Furthermore, it also includes step S6: The rock asphalt powder in the finished product storage tank is packaged into ton bags according to the set weight by the finished product packaging machine, thus completing the packaging of the rock asphalt powder.
[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The rock asphalt powder preparation system and method provided by this invention, by setting up a drum screener, facilitates the screening of powder after being crushed by a double-stage crusher, so as to ensure that the particle size of the powder entering the drum dryer and the gas split impact mill is qualified; by setting up a cold air unit between the air inlet and the air outlet of the cooling chamber of the gas split impact mill, the cold air unit continuously sends cold air into the cooling chamber of the gas split impact mill through the air inlet. After exchanging heat with the gas split impact mill, the cold air is discharged through the air outlet, carrying away the heat generated by the gas split impact mill during the grinding process, thereby achieving cooling of the gas split impact mill; compared with the traditional circulating water cooling method, the cold air unit cooling method of this invention is not limited by seasonal temperature, has a faster cooling speed and a more uniform temperature distribution, which can effectively prevent rock asphalt powder from denaturing due to high temperature and ensure the stability of product quality.
[0016] 2. The rock asphalt powder preparation system and method provided by this invention, by installing an exhaust fan at the air inlet of the air duct and installing multiple evaporators arranged in sequence inside the air duct, facilitates the operation of the cold air system. When the cold air system is working, the exhaust fan draws outside gas into the air duct and exchanges heat with the low-pressure, low-temperature gas-liquid mixture refrigerant in the evaporators in sequence to obtain low-temperature cold air. The low-temperature cold air enters the cooling chamber of the gas splitting impact mill through the cold air delivery pipe and exchanges heat with the gas splitting impact mill. The hot air is then discharged by the hot air extraction system. This quickly removes the large amount of heat generated by the equipment during the grinding process, avoids local overheating of the equipment, and thus ensures the grinding quality of the rock asphalt, making the product particle size more uniform. At the same time, due to the improved cooling effect, the wear rate of the equipment is significantly reduced, the service life is extended, and the production cost is reduced. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the cooling air assembly in an embodiment of the present invention.
[0018] Explanation of reference numerals in the attached drawings: 1-Feeding hopper, 2-Jaw crusher, 3-Double-stage crusher, 4-Drum screen, 5-Drum dryer, 6-Gas diversion impact mill, 7-Air cooling unit, 71-Air duct, 72-Cold air conveying pipeline, 73-Cooling chamber, 74-Hot air extraction system, 75-Evaporator, 76-Refrigeration system, 761-Expansion valve, 762-Condenser, 763-Compressor, 764-Liquid receiver, 765-Filter, 77-Thermostat, 8-Screw feeder, 9-Finished product storage tank, 10-Sealed belt conveyor, 11-Dust removal equipment, 12-Iron separator, 13-Finished product packaging machine. Detailed Implementation
[0019] The technical solutions of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0020] like Figure 1 As shown, a rock asphalt powder preparation system includes a pulverizing section, a dehydration section, a grinding section and a finished product section connected in sequence. The crushing section includes an alligator crusher 2 with a feeding hopper 1, a double-stage crusher 3 and a drum screen 4; the feed inlet of the double-stage crusher 3 is connected to the discharge outlet of the alligator crusher 2, the discharge outlet of the double-stage crusher 3 is connected to the feed inlet of the drum screen 4, and the secondary crushing discharge outlet of the drum screen 4 is connected to the feed inlet of the double-stage crusher 3. The dewatering section includes a drum dryer 5 whose feed end is connected to the screening outlet of the drum screener 4; The grinding section includes a gas splitting impact mill 6 whose feed inlet is connected to the discharge end of the drum dryer 5. A cold air unit 7 is provided between the air inlet and the air outlet of the cooling chamber 73 of the gas splitting impact mill 6. The finished product section includes a screw feeder 8 whose inlet is connected to the outlet of the gas splitting impact mill 6, and a finished product storage tank 9 located at the outlet of the screw feeder 8.
[0021] like Figure 2 As shown, the air cooling unit 7 includes an air duct 71, an exhaust fan is provided at the air inlet of the air duct 71, and the air outlet of the air duct 71 is connected to the air inlet of the cooling chamber 73 of the gas splitting impact mill 6 through a cold air conveying pipe 72. A hot air exhaust system 74 is provided at the air outlet of the cooling chamber 73 of the gas splitting impact mill 6. The duct 71 has multiple evaporators 75 arranged in sequence inside, and a refrigeration system 76 connected to the evaporators 75 is provided outside the duct 71. The outside gas exchanges heat with the low-pressure, low-temperature gas-liquid mixture refrigerant in multiple evaporators 75 in sequence to obtain low-temperature gas.
[0022] like Figure 2 As shown, the refrigeration system 76 includes an expansion valve 761, a condenser 762, and a compressor 763 connected in series between the liquid inlet and liquid outlet of the evaporator 75. The compressor 763 compresses the low-pressure, low-temperature gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant, which is then delivered to the condenser 762. The high-temperature, high-pressure gaseous refrigerant exchanges heat with the outside environment through the condenser 762 and condenses into a high-pressure, room-temperature liquid refrigerant. The high-pressure, room-temperature liquid refrigerant passes through the expansion valve 761 and forms a low-pressure, low-temperature gas-liquid mixture. The low-pressure, low-temperature gas-liquid mixture exchanges heat with the gas entering the duct 71 in the evaporator 75 and forms a low-pressure, low-temperature gaseous refrigerant, which then re-enters the compressor 763.
[0023] like Figure 2 As shown, a liquid receiver 764 and a filter 765 are sequentially provided between the refrigerant outlet of the condenser 762 and the refrigerant inlet of the expansion valve 761.
[0024] It also includes a temperature controller 77 that is electrically connected to the exhaust fan, the hot air extraction system 74, and the compressor 763; a temperature sensor is provided inside the gas diversion impact mill 6, and the temperature sensor is electrically connected to the temperature controller 77; the temperature controller 77 controls the operation and temperature adjustment of the exhaust fan, the hot air extraction system 74, and the compressor 763 through the temperature signal collected by the temperature sensor.
[0025] It also includes a power supply, and the exhaust fan, hot air extraction system 74, compressor 763 and thermostat 77 are all connected to the power supply.
[0026] like Figure 1 As shown, it also includes a dust removal device 11 connected to the drum dryer 5, the gas diversion impact mill 6, the screw feeder 8, and the finished product storage tank 9.
[0027] like Figure 1 As shown, sealed belt conveyors 10 are installed between the feed inlet of the double-stage crusher 3 and the discharge outlet of the alligator crusher 2, between the discharge outlet of the double-stage crusher 3 and the feed inlet of the drum screen 4, between the secondary crushing discharge outlet of the drum screen 4 and the feed inlet of the double-stage crusher 3, and between the discharge end of the drum dryer 5 and the feed inlet of the gas diversion impact mill 6.
[0028] In this embodiment, in order to prevent iron impurities present in the rock asphalt ore from damaging the double-stage crusher 3, an iron remover 12 is installed on the sealed belt conveyor 10 between the feed inlet of the double-stage crusher 3 and the discharge outlet of the alligator crusher 2.
[0029] The specific method for preparing rock pitch powder based on the above preparation system of the present invention is as follows: S1. Rock asphalt ore with a particle size of 2-40cm is fed into the jaw crusher 2 through the feeding hopper 1. The jaw crusher 2 performs primary crushing and crushes it to a particle size of less than 200mm. S2, the double-stage crusher 3 performs secondary crushing on rock asphalt ore with a particle size of less than 200mm after the primary crushing; After crushing, the raw rock asphalt ore with a particle size greater than 3mm is screened by the drum screener 4. The raw rock asphalt ore with a particle size greater than 3mm is fed back into the double-stage crusher 3, and the powder with a particle size less than or equal to 3mm is fed into the drum dryer 5. S3, the drum dryer 5 dries powder with a particle size of less than or equal to 3mm at a temperature of 60-80℃ for 15 minutes, so that the moisture content of the powder is less than 1%; S4. After the dried powder is cooled to room temperature, it is transported to the gas split impact mill 6. At the same time, cold air at -35°C is delivered to the cooling chamber 73 of the gas split impact mill 6 through the cold air unit 7. The gas split impact mill 6 grinds powder with a particle size of less than or equal to 3 mm in a cooling environment of -35℃ to obtain powder with a fineness of 100 mesh. S5. After grinding, the powder with a fineness of 100 mesh is conveyed to the finished product storage tank 9 by the screw feeder 8 to complete the preparation of rock asphalt powder. S6. The rock asphalt powder in the finished product storage tank 9 is packaged into ton bags according to the set weight by the finished product packaging machine 13, thus completing the packaging of the rock asphalt powder.
[0030] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A system for producing rock asphalt powder, characterized by, The pulverizing part, the dewatering part, the grinding part and the finished product part are connected in sequence. The pulverizing part comprises a crocodile crusher (2) with a feeding bin (1), a double-stage crusher (3) and a drum screening machine (4). The feeding port of the double-stage crusher (3) is connected with the discharging port of the crocodile crusher (2), the discharging port of the double-stage crusher (3) is connected with the feeding port of the drum screening machine (4), and the secondary crushing discharging port of the drum screening machine (4) is connected with the feeding port of the double-stage crusher (3). The dewatering part comprises a drum dryer (5) with a feeding end connected with the screening discharging port of the drum screening machine (4). The grinding part comprises a gas shunt impact mill (6) with a feeding port connected with the discharging end of the drum dryer (5), and a cooling cavity (73) of the gas shunt impact mill (6) is provided with a cold air fan unit (7) between the air inlet and the air outlet. The finished product part comprises a screw feeder (8) with a feeding port connected with the discharging port of the gas shunt impact mill (6), and a finished product storage tank (9) arranged at the discharging port of the screw feeder (8).
2. The system for preparing rock pitch powder according to claim 1, characterized by, The cold air fan unit (7) comprises an air pipe (71), the air pipe (71) is provided with an air extractor at the air inlet, the air outlet of the air pipe (71) is connected with the air inlet of the cooling cavity (73) of the gas shunt impact mill (6) through a cold air delivery pipeline (72), and the air outlet of the cooling cavity (73) of the gas shunt impact mill (6) is provided with a hot air leading-out system (74). The inside of the air pipe (71) is provided with a plurality of evaporators (75) arranged in sequence, and the outside of the air pipe (71) is provided with a refrigeration system (76) connected with the evaporators (75). The outside gas is sequentially exchanged heat with the low-pressure and low-temperature gas-liquid mixed refrigerant in the plurality of evaporators (75) to obtain low-temperature gas.
3. The system for producing rock pitch powder according to claim 2, characterized by: The refrigeration system (76) comprises an expansion valve (761), a condenser (762) and a compressor (763) connected in series between the liquid inlet and the liquid outlet of the evaporator (75). The compressor (763) compresses the low-pressure and low-temperature gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant, which is delivered to the condenser (762). The high-temperature and high-pressure gaseous refrigerant is condensed into high-pressure and normal-temperature liquid refrigerant through heat exchange with the outside air. The high-pressure and normal-temperature liquid refrigerant is expanded through the expansion valve (761) to form a low-pressure and low-temperature gas-liquid mixture. The low-pressure and low-temperature gas-liquid mixed refrigerant exchanges heat with the gas in the air pipe (71) in the evaporator (75) to form low-pressure and low-temperature gaseous refrigerant, which reenters the compressor (763).
4. The system for producing rock pitch powder according to claim 3, characterized by: A liquid accumulator (764) and a filter (765) are sequentially arranged between the refrigerant outlet of the condenser (762) and the refrigerant inlet of the expansion valve (761).
5. The system for producing rock pitch powder according to claim 4, characterized by: A temperature controller (77) is electrically connected with the air extractor, the hot air leading-out system (74) and the compressor (763). A temperature sensor is arranged in the gas shunt impact mill (6) and is electrically connected with the temperature controller (77). The temperature controller (77) controls the air extractor, the hot air leading-out system (74) and the compressor (763) to work and adjust the temperature according to the temperature signal collected by the temperature sensor.
6. The system for preparing rock pitch powder according to claim 4, characterized by: The power supply is connected with the power supply of the air extractor, the hot air leading-out system (74), the compressor (763) and the temperature controller (77).
7. The system for producing rock pitch powder according to claim 1, characterized by: The dust removal equipment (11) is connected with the drum dryer (5), the gas shunt impact mill (6), the screw feeder (8) and the finished product storage tank (9).
8. The system for producing rock pitch powder according to claim 1, characterized by, The sealing type belt conveyor (10) is arranged between the feeding port of the double-stage crusher (3) and the discharging port of the alligator crusher (2), between the discharging port of the double-stage crusher (3) and the feeding port of the drum screening machine (4), between the secondary crushing discharging port of the drum screening machine (4) and the feeding port of the double-stage crusher (3), and between the discharging end of the drum dryer (5) and the feeding port of the gas shunt impact mill (6).
9. A method of producing rock asphalt powder, characterized by, The method comprises the following steps: S1, the rock asphalt raw ore with a particle size of 2-40 cm is sent into the alligator crusher (2) through the feeding bin (1), and is initially crushed by the alligator crusher (2) and is crushed to a particle size of less than 200 mm; S2, the double-stage crusher (3) performs secondary crushing on the rock asphalt raw ore with a particle size of less than 200 mm after initial crushing; After crushing, the drum screening machine (4) is used for screening, the rock asphalt raw ore with a particle size of greater than 3 mm is sent into the double-stage crusher (3) again, and the powder with a particle size of less than or equal to 3 mm is sent into the drum dryer (5); S3, the drum dryer (5) is used for drying the powder with a particle size of less than or equal to 3 mm at a temperature of 60-80 DEG C, and the drying time is 15 min, so that the water content of the powder is less than 1%; S4, the powder after drying is cooled to room temperature and then conveyed to the gas shunt impact mill (6), and meanwhile, the cold air machine set (7) is used for conveying-35 DEG C cold air into the cooling cavity (73) of the gas shunt impact mill (6); The gas shunt impact mill (6) is used for grinding the powder with a particle size of less than or equal to 3 mm in a cooling environment of-35 DEG C, and the powder with a fineness of 100 mesh is obtained; S5, after grinding, the powder with a fineness of 100 mesh is conveyed into the finished product storage tank (9) by the screw feeder (8), and the preparation of the rock asphalt powder is completed.
10. The method of producing rock pitch powder according to claim 9, characterized by, The method further comprises the following step S6: The rock asphalt powder in the finished product storage tank (9) is packaged into ton bags according to a set weight by the finished product packaging machine (13), and the packaging of the rock asphalt powder is completed.