CN109868707A - A kind of original recycled aggregate drying equipment integral system and method - Google Patents

A kind of original recycled aggregate drying equipment integral system and method Download PDF

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Publication number
CN109868707A
CN109868707A CN201910277056.4A CN201910277056A CN109868707A CN 109868707 A CN109868707 A CN 109868707A CN 201910277056 A CN201910277056 A CN 201910277056A CN 109868707 A CN109868707 A CN 109868707A
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China
Prior art keywords
drying roller
material drying
primary
reworked material
roller
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Pending
Application number
CN201910277056.4A
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Chinese (zh)
Inventor
黄文景
侯建强
杨森
翟资雄
张小军
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Fujian South Highway Machinery Co Ltd
Original Assignee
Fujian South Highway Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Fujian South Highway Machinery Co Ltd filed Critical Fujian South Highway Machinery Co Ltd
Priority to CN201910277056.4A priority Critical patent/CN109868707A/en
Publication of CN109868707A publication Critical patent/CN109868707A/en
Pending legal-status Critical Current

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Abstract

The present invention relates to pitch drying equipment technology, in particular to a kind of former recycled aggregate drying equipment integral system and method.The system includes primary material drying roller, reworked material drying roller, primary material drying roller is equipped with burner, the first air inducing case, reworked material drying roller is equipped with hot fume entrance, the second air inducing case, first air inducing case is connect by hot smoke pipe with hot fume entrance, hot fume stream in primary material drying roller is introduced into reworked material drying roller, second air inducing case is connected to primary material drying roller by offgas duct and is introduced by being equipped with burner one end, and reworked material drying roller tail gas is introduced and carries out second-time burning at primary material drying roller inner burner.Primary material, reworked material drying roller share a set of burner, and equipment cost is low;Reworked material drying roller is dried using hot fume heat exchange mode, and temperature is uniformly easily-controllable, while eliminating furnace sections;Recycle heat uses, and energy utilization rate is high, and apparatus adaptability is high.

Description

A kind of original recycled aggregate drying equipment integral system and method
Technical field
The present invention relates to pitch drying equipment technology, in particular to a kind of former recycled aggregate drying equipment integration system System and method.
Background technique
Asphalt is mixture made of being mixed and stirred as mineral aggregate and asphalt binder, aggregate be broadly divided into primary aggregate and Recycled aggregate, primary aggregate refer to that the natural aggregates such as sandstone, recycled aggregate refer to discarded bituminous pavement reclaimed materials.Primary material and reworked material Due to its material properties difference, baking process is generally required to be handled by two sets of different equipment, two sets of independent drying dresses It sets with biggish energy waste and needs corresponding setting environmental protection equipment, working efficiency is lower.
To solve the above problems, the Chinese patent that Authorization Notice No. is CN 204509958U, which discloses one kind, is suitable for drip The recycling and reusing system of green mixture drying heating, including reworked material Drying and primary material Drying, two Dryings into Port is connected to reworked material burner and primary material with burner respectively by air inlet pipe, to the reworked material and original in Drying Raw material provide heating source, it is characterised in that: the gas outlet of the reworked material Drying is connected to hot gas cycle pipe and tail gas recycles Pipe, hot gas cycle pipe access the air inlet of reworked material burner, and tail gas recycling pipe accesses the air inlet of primary material burner Mouthful, the hot gas cycle pipe and tail gas recycle and implement logical close by adjustable damper between pipe.Existing original recycled aggregate dries Dry integrated system realizes tail gas thermal cycle, but still needs using two sets of heating plants, higher cost;Meanwhile it is traditional again Raw aggregate drying roller in order to heating uniformity and prevent sizing, the general design scheme for adding burner hearth using burner, combustion Burner and the expense of burner hearth are relatively high, and the service life of burner hearth is relatively low, therefore there are costs, maintenance for existing design Cost and the relatively high problem of operation cost.
Summary of the invention
In order to overcome the shortcomings in the prior art, the present invention provides that a kind of equipment, maintenance cost is low, heat utilization rate is high, produces The measured former recycled aggregate drying equipment integral system of quality and method.
To achieve the above object, The technical solution adopted by the invention is as follows: a kind of original recycled aggregate drying equipment integration System, including primary material drying roller, reworked material drying roller, it is characterised in that: primary material drying roller both ends are respectively equipped with Burner, the first air inducing case, reworked material drying roller both ends are respectively equipped with hot fume entrance, the second air inducing case, the first air inducing case Connect by hot smoke pipe with hot fume entrance, by primary material drying roller hot fume stream introduce reworked material drying roller, second Air inducing case is connected to primary material drying roller by offgas duct and is introduced by being equipped with burner one end, by reworked material drying roller tail Gas, which introduces, carries out second-time burning at primary material drying roller inner burner.
Further, it is additionally provided with deduster, primary material drying roller is additionally provided with the first dust removing tube, the first dust removing tube connection the One air inducing case and deduster, reworked material drying roller are equipped with the second dust removing tube, and the second dust removing tube connects the second air inducing case and dedusting Device.
Further, hot smoke pipe is equipped with the first air-introduced machine towards hot fume entrance air inducing, and offgas duct is equipped with direction Second air-introduced machine of primary material drying roller burner one end air inducing, the first dust removing tube are equipped with the third air inducing towards deduster Machine, deduster be equipped with provide deduster negative pressure and outwardly after emission treatment tail gas the 4th air-introduced machine.
Further, primary material drying roller is equipped with the first variable-frequency motor of driving roller rotation, reworked material drying roller The second variable-frequency motor equipped with driving roller rotation.
Further, primary material drying roller both ends are respectively equipped with primary material feed inlet, primary material discharge port, primary material into Material mouth is located at first air inducing case one end, and primary material discharge port is located at burner one end, and primary material drying roller uses counterflow heat exchange Mode heats primary material;Reworked material drying roller both ends are respectively equipped with reworked material feed inlet, reworked material discharge port, reworked material charging Mouth is located at second air inducing case one end, and reworked material discharge port is located at hot fume entrance one end, and reworked material drying roller is changed using adverse current Hot mode heats reworked material.
A kind of original recycled aggregate drying equipment integral method, it is characterised in that: again based on original described in above-mentioned any one Raw aggregate drying equipment integral system comprising following steps:
Step 1, primary material drying roller rotation, burner operation, primary aggregate are entered by primary material feed inlet, are burnt Device dries primary aggregate with countercurrent heat exchange method, and the primary aggregate after drying is sent out by primary material discharge port;
Step 2, the high hot exhaust gas that primary material drying roller generates is in the first air inducing case by hot smoke pipe from hot fume entrance Into in reworked material drying roller, reworked material drying roller rotation, reworked material is entered by reworked material feed inlet, reworked material and hot cigarette Gas is dried with countercurrent heat exchange method, and the reworked material after drying is sent out by reworked material discharge port;
Step 3, the tail gas that reworked material drying roller generates return to former drying raw meal by offgas duct in the second air inducing case Roller is sent into equipped with burner one end, and remaining heat is sent back in primary material drying roller in tail gas, while tail gas is burning The content of harmful substance in tail gas is reduced at device by second-time burning.
Further, the first air inducing case also passes through the first dust removing tube and is connected to deduster, and hot smoke pipe is equipped with the first air inducing Machine, the first dust removing tube are equipped with third air-introduced machine, and the power by adjusting the first air-introduced machine and third air-introduced machine is passed through with adjusting Hot fume enters the flow of reworked material drying roller, and then adjusts reworked material drying roller temperature.
Further, the second air inducing case also passes through the second dust removing tube and is connected to deduster, and deduster passes through the 4th air-introduced machine Negative pressure is provided, offgas duct is equipped with the second air-introduced machine, is recovered into former drying raw meal by adjusting the second air-introduced machine power to adjust The tail gas of roller further controls primary the first air inducing of material drying roller case outlet temperature.
Further, the control of reworked material drying roller hot fume inlet temperature is at 450-600 DEG C, the first dust removing tube, second The temperature that dust removing tube is sent into deduster is controlled at 90-110 DEG C.
Further, primary aggregate can be only dried, that is, closes hot smoke pipe, the tail gas that primary material drying roller generates only passes through First dust removing tube is sent to processing discharge in deduster;Recycled aggregate can be only dried, that is, closes the first deduster pipe, burner generates Hot fume by hot smoke pipe be sent into reworked material drying roller reworked material is dried, reworked material drying roller generate tail gas A part sends primary material drying roller second-time burning back to by offgas duct, and a part is sent by the second dust removing tube to deduster Reason discharge.
By the above-mentioned description of this invention it is found that compared with prior art, a kind of former recycled aggregate provided by the invention dries Dry equipment integral system and method, primary material, reworked material drying roller share a set of burner, and equipment cost is low;Reworked material Drying roller is dried using hot fume heat exchange mode, and temperature is uniformly easily-controllable, and product quality is excellent, while eliminating furnace sections, into One step reduces equipment and maintenance cost;Recycle heat uses, and improves energy utilization rate;Each air-introduced machine and each motor coordination control, Easily controllable each device temperature improves the adaptability to different operating conditions, different product production.
Detailed description of the invention
Fig. 1 is a kind of former recycled aggregate drying equipment integral system structural schematic diagram of the present invention.
It is as follows that correspondence is identified in figure: 1. primary material drying rollers, 11. first variable-frequency motors, 12 burners, 13. first are drawn Bellows, 14. primary material feed inlets, 15. primary material discharge ports, 2. reworked material drying rollers, 21. second variable-frequency motors, 22. hot cigarettes Gas entrance, 23. second air inducing casees, 24. reworked material feed inlets, 25. reworked material discharge ports, 3. dedusters, 31. the 4th air-introduced machines, 4. hot smoke pipe, 41. first air-introduced machines, 5. offgas ducts, 51. second air-introduced machines, 6. first dust removing tubes, 61. third air-introduced machines, 7. Two dust removing tubes.
Specific embodiment
Below by way of specific embodiment, the invention will be further described.
Shown in referring to Fig.1, a kind of original recycled aggregate drying equipment integral system, including primary material drying roller 1, regeneration Expect drying roller 2, deduster 3.
By the driving rotation of the first variable-frequency motor 11, primary 1 both ends of material drying roller are respectively equipped with primary material drying roller 1 Burner 12, the first air inducing case 13, primary 1 both ends of material drying roller further respectively have primary material feed inlet 14, the discharging of primary material Mouth 15, primary material feed inlet 14 is located at 13 one end of the first air inducing case, and primary material discharge port 15 is located at 12 one end of burner, primary material Drying roller 1 heats primary material using countercurrent heat exchange method;Reworked material drying roller 2 is turned by the driving of the second variable-frequency motor 21 Dynamic, 2 both ends of reworked material drying roller are respectively equipped with hot fume entrance 22, the second air inducing case 23,1 both ends of reworked material drying roller point It is not additionally provided with reworked material feed inlet 24, reworked material discharge port 25, reworked material feed inlet 24 is located at 23 one end of the second air inducing case, regeneration Material discharge port 25 is located at 22 one end of hot fume entrance, and reworked material drying roller 2 heats reworked material using countercurrent heat exchange method;
First air inducing case 13 of primary material drying roller 1 is connect by hot smoke pipe 4 with hot fume entrance 22, on hot smoke pipe 4 Equipped with the first air-introduced machine 41 towards 22 air inducing of hot fume entrance, hot fume in primary material drying roller 1 is introduced into reworked material and is dried Dry drum 2;Second air inducing case 23 of reworked material drying roller 2 is connected to primary material drying roller 1 by offgas duct 5 and is equipped with burning One end of device 12, offgas duct 5 are equipped with the second air-introduced machine 51 towards primary 1 burner of material drying roller, 12 one end air inducing, will 2 tail gas of reworked material drying roller, which introduces, carries out second-time burning at primary 1 inner burner 12 of material drying roller.
Primary material drying roller 1 is additionally provided with the first dust removing tube 6, and the first dust removing tube 6 connects the first air inducing case 13 and deduster 3, the first dust removing tube 6 is equipped with the third air-introduced machine 61 towards deduster 3, and reworked material drying roller 2 is equipped with the second dust removing tube 7, The second air inducing case 23 of second dust removing tube 7 connection and deduster 3, deduster 3, which is equipped with, provides 3 negative pressure of deduster and outwardly at discharge The tail gas part that 4th air-introduced machine 31 of tail gas after reason, reworked material drying roller 2 and primary material drying roller 1 generate enters dedusting Device 3 is handled.
A kind of original recycled aggregate drying equipment integral method, including three kinds of operating conditions, i.e., dry simultaneously primary aggregate with again Raw aggregate only dries primary aggregate use, the only use of drying recycled aggregate.
Primary aggregate and recycled aggregate are dried simultaneously, steps are as follows for working principle:
Step 1, primary material drying roller 1 are with ignition temperature by the driving rotation of the first variable-frequency motor 11, burner 12 1300-1500 DEG C of temperature carries out heating work, and primary aggregate is entered by primary material feed inlet 14, and burner 12 is to primary aggregate It is dried with countercurrent heat exchange method, the primary aggregate after drying is sent out by primary material discharge port 15;
Step 2,450-600 DEG C of the high hot exhaust gas that primary material drying roller 1 generates pass through hot cigarette in the first air inducing case 13 Pipe 4 enters in reworked material drying roller 2 from hot fume entrance 22, and reworked material drying roller 2 is rotated by the second variable-frequency motor 21, Reworked material is entered by reworked material feed inlet 24, and reworked material and hot fume are dried with countercurrent heat exchange method, the reworked material after drying by Reworked material discharge port 25 is sent out;
At the same time, the tail gas of primary aggregate drying roller 1 some the first air inducing case 13 pass through the first dedusting Pipe 6 is connected to the processing of deduster 3, and hot smoke pipe 4 is equipped with the first air-introduced machine 41, and the first dust removing tube 6 is equipped with third air-introduced machine 61, By adjusting the power of the first air-introduced machine 41 and third air-introduced machine 61 to adjust the stream that hot fume enters reworked material drying roller 2 Amount, while 11 revolving speed of the first variable-frequency motor of coordinated control, adjustment are with control 2 hot fume inlet temperature of reworked material drying roller 450-600 DEG C and control the first dust removing tube 6 be sent into deduster 3 temperature control at 90-110 DEG C.
Step 3, the tail gas that reworked material drying roller 2 generates return to primary material by offgas duct 5 in the second air inducing case 23 Drying roller 1 is sent into equipped with 12 one end of burner, and remaining heat is sent back in primary material drying roller 1 in tail gas, while tail Gas is reduced the content of harmful substance in tail gas at burner 12 by second-time burning.
At the same time, deduster 3 provides negative pressure by the 4th air-introduced machine 31, and offgas duct 5 is equipped with the second air-introduced machine 51, leads to Adjustment 51 power of the second air-introduced machine is crossed to adjust the tail gas for being recovered into primary material drying roller 1, while the first frequency conversion of coordinated control Motor 11,21 revolving speed of the second variable-frequency motor further control primary 1 first air inducing case of material drying roller, 13 outlet temperature, and control Making the second dust removing tube 7 and being sent into the exhaust temperature control of deduster 3 is 90-110 DEG C.
To sum up, primary material drying roller 1, reworked material drying roller 2 only used one group of burner 12 as heating dress It sets, reworked material drying roller 2 is in such a way that hot fume heats, and relative to conventional burners heating method, heating temperature is more Uniformly, it is ensured that reworked material is in heating, drying under preference temperature, and avoids burner flame contact reworked material and occurred Heat problem can save the design of burner hearth, can reduce material and glue cylinder problem, equipment cost, clean and maintenance cost all significantly drop It is low;According to primary aggregate and recycled aggregate self-characteristic, primary aggregate heating temperature is higher, recycled aggregate heating temperature is lower, Therefore, the high-temperature tail gas after the completion of primary aggregate heating, drying is enough to provide recycled aggregate heating, drying required temperature, reworked material 2 tail gas of drying roller sends primary 1 second-time burning of material drying roller back to by offgas duct 5 again, and after-heat is recycled again, into One step reduces fuel cost, and tail gas second-time burning, and full combustion can reduce pernicious gas content in tail gas;On each pipeline Air-introduced machine revolving speed it is adjustable, the first variable-frequency motor 11 and the second variable-frequency electric of primary material drying roller 1 and reworked material drying roller 2 The also adjustable revolving speed of machine 21, passes through each coordinated control, it is ensured that primary material drying roller 1 can be fitted with reworked material drying roller 2 The demand for answering operating temperature under different operating conditions guarantees the quality requirements of product, while it is useless also to can control the processing of deduster 3 The temperature of gas promotes the working efficiency and working life of deduster 3, and circulation of tail gas, which uses, also can reduce 3 operating pressure of deduster.
It only dries primary aggregate to use, steps are as follows for working principle:
The primary rotation of material drying roller 1, burner 12 work, and close hot smoke pipe 4, primary aggregate is by primary material feed inlet 14 Into burner 12 dries primary aggregate with countercurrent heat exchange method, and the primary aggregate after drying is sent by primary material discharge port 15 Out, the first air inducing case 13 is expelled to atmosphere after sending tail gas to the purification of deduster 3 by the first dust removing tube 6.
Recycled aggregate can be only dried, steps are as follows for working principle:
The burner 12 of primary material drying roller 1 works, and closes the first dust removing tube 6, the hot gas of generation is in the first air inducing case 13 by hot smoke pipe from hot fume entrance 22 enter reworked material drying roller 2 in, reworked material drying roller 2 rotate, reworked material by Reworked material feed inlet 24 enters, and reworked material and hot fume are dried with countercurrent heat exchange method, and the reworked material after drying is gone out by reworked material Material mouth 25 is sent out, and a part of tail gas is returned to primary material drying roller 1 equipped with burner by offgas duct 5 by the second air inducing case 23 12 one end are sent into, and remaining heat is sent back in primary material drying roller 1 in tail gas, while tail gas is secondary at burner 12 It burns to reduce the content of harmful substance in tail gas, a part is sent by the second dust removing tube 7 to processing discharge in deduster 3.
Realize the integrated integrated system that a set of equipment is suitable for various working.
It above are only a kind of specific embodiment of the invention, but the design concept of the present invention is not limited to this, all benefits It is made a non-material change to the present invention, should all be belonged to behavior that violates the scope of protection of the present invention with this design.

Claims (10)

1. a kind of original recycled aggregate drying equipment integral system, including primary material drying roller, reworked material drying roller, special Sign is: primary material drying roller both ends are respectively equipped with burner, the first air inducing case, and reworked material drying roller both ends are respectively equipped with Hot fume entrance, the second air inducing case, the first air inducing case are connect by hot smoke pipe with hot fume entrance, will be in primary material drying roller Hot fume stream introduces reworked material drying roller, and the second air inducing case is connected to primary material drying roller by offgas duct and is fired by being equipped with Burner one end introduces, and reworked material drying roller tail gas is introduced and carries out second-time burning at primary material drying roller inner burner.
2. a kind of former recycled aggregate drying equipment integral system according to claim 1, it is characterised in that: be additionally provided with dedusting Device, primary material drying roller are additionally provided with the first dust removing tube, and the first dust removing tube connects the first air inducing case and deduster, reworked material drying Roller is equipped with the second dust removing tube, and the second dust removing tube connects the second air inducing case and deduster.
3. a kind of former recycled aggregate drying equipment integral system according to claim 2, it is characterised in that: set on hot smoke pipe There is the first air-introduced machine towards hot fume entrance air inducing, offgas duct is equipped with towards primary material drying roller burner one end air inducing The second air-introduced machine, the first dust removing tube be equipped with towards deduster third air-introduced machine, deduster be equipped with provide deduster negative pressure And outwardly after emission treatment tail gas the 4th air-introduced machine.
4. a kind of former recycled aggregate drying equipment integral system according to claim 1, it is characterised in that: former drying raw meal Roller is equipped with the first variable-frequency motor of driving roller rotation, and reworked material drying roller is equipped with the second variable-frequency electric of driving roller rotation Machine.
5. a kind of former recycled aggregate drying equipment integral system according to claim 1, it is characterised in that: former drying raw meal Roller both ends are respectively equipped with primary material feed inlet, primary material discharge port, and primary material feed inlet is located at first air inducing case one end, primary Material discharge port is located at burner one end, and primary material drying roller heats primary material using countercurrent heat exchange method;Reworked material drying rolling Cylinder both ends are respectively equipped with reworked material feed inlet, reworked material discharge port, and reworked material feed inlet is located at second air inducing case one end, reworked material Discharge port is located at hot fume entrance one end, and reworked material drying roller heats reworked material using countercurrent heat exchange method.
6. a kind of original recycled aggregate drying equipment integral method, it is characterised in that: based on described in claim 1-5 any one Former recycled aggregate drying equipment integral system comprising following steps:
Step 1, primary material drying roller rotation, burner operation, primary aggregate are entered by primary material feed inlet, burner pair Primary aggregate is dried with countercurrent heat exchange method, and the primary aggregate after drying is sent out by primary material discharge port;
Step 2, the high hot exhaust gas that primary material drying roller generates are entered by hot smoke pipe from hot fume entrance in the first air inducing case In reworked material drying roller, the rotation of reworked material drying roller, reworked material enters by reworked material feed inlet, reworked material and hot fume with Countercurrent heat exchange method drying, the reworked material after drying are sent out by reworked material discharge port;
Step 3, the tail gas that reworked material drying roller generates return to primary material drying roller by offgas duct in the second air inducing case It is sent into equipped with burner one end, remaining heat is sent back in primary material drying roller in tail gas, while tail gas is at burner The content of harmful substance in tail gas is reduced by second-time burning.
7. a kind of former recycled aggregate drying equipment integral method according to claim 6, it is characterised in that: the first air inducing case Deduster is also connected to by the first dust removing tube, hot smoke pipe is equipped with the first air-introduced machine, and the first dust removing tube is equipped with third air inducing Machine, by adjusting the power of the first air-introduced machine and third air-introduced machine to adjust the stream for entering reworked material drying roller by hot fume Amount, and then adjust reworked material drying roller temperature.
8. a kind of former recycled aggregate drying equipment integral method according to claim 7, it is characterised in that: the second air inducing case Deduster is also connected to by the second dust removing tube, deduster provides negative pressure by the 4th air-introduced machine, and offgas duct is equipped with second and draws Blower further controls primary material by adjusting the second air-introduced machine power to adjust the tail gas for being recovered into primary material drying roller Drying roller the first air inducing case outlet temperature.
9. a kind of former recycled aggregate drying equipment integral method according to claim 8, it is characterised in that: reworked material drying At 450-600 DEG C, the temperature control that the first dust removing tube, the second dust removing tube are sent into deduster exists the control of roller hot fume inlet temperature 90-110℃。
10. a kind of former recycled aggregate drying equipment integral method according to claim 6, it is characterised in that: can only dry Primary aggregate, that is, close hot smoke pipe, and the tail gas that primary material drying roller generates only passes through the first dust removing tube and send to deduster Reason discharge;Recycled aggregate can be only dried, that is, closes the first deduster pipe, the hot fume that burner generates is sent into again by hot smoke pipe Drying raw meal roller dries reworked material, and tail gas a part that reworked material drying roller generates is sent back to primary by offgas duct Expect drying roller second-time burning, a part is sent to processing in deduster by the second dust removing tube and is discharged.
CN201910277056.4A 2019-04-08 2019-04-08 A kind of original recycled aggregate drying equipment integral system and method Pending CN109868707A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910277056.4A CN109868707A (en) 2019-04-08 2019-04-08 A kind of original recycled aggregate drying equipment integral system and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910277056.4A CN109868707A (en) 2019-04-08 2019-04-08 A kind of original recycled aggregate drying equipment integral system and method

Publications (1)

Publication Number Publication Date
CN109868707A true CN109868707A (en) 2019-06-11

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CN201910277056.4A Pending CN109868707A (en) 2019-04-08 2019-04-08 A kind of original recycled aggregate drying equipment integral system and method

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111504048A (en) * 2020-04-24 2020-08-07 秦皇岛龙成路桥有限公司 Recycled aggregate drying-machine with dust removal function
CN112301836A (en) * 2019-07-26 2021-02-02 福建南方路面机械股份有限公司 Reclaimed material stirring system and reclaimed material drying cylinder sticky material cleaning process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112301836A (en) * 2019-07-26 2021-02-02 福建南方路面机械股份有限公司 Reclaimed material stirring system and reclaimed material drying cylinder sticky material cleaning process
CN111504048A (en) * 2020-04-24 2020-08-07 秦皇岛龙成路桥有限公司 Recycled aggregate drying-machine with dust removal function

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