A drying device for recycled aggregates of construction waste

Abstract

The present invention discloses a drying device for recycled aggregate from construction waste, which relates to the technical field of recycled aggregate drying. The main technical features of the drying device are as follows: a frame, a dryer body with an adjustable inclination angle, and a heater disposed on the dryer body. The dryer body includes a drum, a feed port, a discharge port, and an air outlet located above the discharge port. A rotatable core barrel is coaxially disposed within the drum, a first lifting plate is disposed on the inner wall of the drum, and a second lifting plate is disposed on the outer wall of the core barrel corresponding to the first lifting plate. The core barrel is driven by a rotary drive member. A heat recovery pipe is disposed within the core barrel, and independent return and exhaust chambers are disposed on the sides of the discharge port. The air outlet is connected to the return chamber via a pipe, and the exhaust chamber is provided with an exhaust port. The heat recovery pipe has two ends connected to the return and exhaust chambers, respectively. The present invention forms a closed-loop hot air circulation system by providing the coaxial core barrel and the built-in heat recovery pipe, and cooperating with the independent return and exhaust chambers to form the closed-loop hot air circulation system. The system has the advantages of high energy utilization and good drying effect.

Description

Technical Field

[0001] The present invention relates to the technical field of recycled aggregate drying, and more particularly to a construction waste recycled aggregate drying device. Background Art

[0002] In the field of construction waste resource utilization, recycled aggregate is an important renewable resource, and its quality and performance directly affect the production and application of subsequent building materials. However, recycled aggregate usually needs to be dried before use to remove moisture and ensure its stability and performance. Traditional construction waste recycled aggregate drying equipment mostly uses a drum dryer, which uses a heater to heat and dry the recycled aggregate in the drum. However, this type of drying device has many shortcomings. First, the inclination angle of the dryer body is usually fixed, and the outflow rate of the aggregate cannot be flexibly adjusted according to the properties, humidity, and drying requirements of the recycled aggregate. This may lead to aggregate accumulation or excessive flow during the drying process, affecting drying efficiency and stability. Second, the hot air generated during the drying process is often directly discharged and not effectively utilized, resulting in energy waste.

[0003] Therefore, a new solution needs to be proposed to solve this problem. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a construction waste recycled aggregate drying device, which has the advantages of high energy utilization rate and good drying effect.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A construction waste recycled aggregate drying device, comprising a frame, a dryer body installed on the frame with an adjustable inclination angle, and a heater arranged on the dryer body, the dryer body comprising a drum, a feed port, a discharge port and an air outlet located above the discharge port, a rotatable core barrel coaxially provided in the drum, a first lifting plate provided on the inner wall of the drum, a second lifting plate corresponding to the first lifting plate provided on the outer wall of the core barrel, the core barrel driven by a rotating drive member, a heat recovery pipe provided in the core barrel, a return air chamber and an exhaust chamber independent of each other provided on the side of the discharge port, the air outlet is connected to the return air chamber via a pipeline, the exhaust chamber is provided with an exhaust port, and the two ends of the heat recovery pipe are respectively connected to the return air chamber and the exhaust chamber.

[0006] In one embodiment, the dryer body also includes a base, with a feed end cylinder and a discharge end cylinder at both ends of the base respectively, and a sealing cover is provided at the end of the feed end cylinder and the discharge end cylinder away from the drum, the feed port is provided at the top of the feed end cylinder, the discharge port is provided at the bottom of the discharge end cylinder, and the air outlet is provided at the top, the drum is rotatably connected between the feed end cylinder and the discharge end cylinder, and a support ring and a gear ring are coaxially provided on its outer wall, the base is provided with a support wheel that rolls with the support ring and a first reduction motor with a drive gear, and the drive gear is meshed with the gear ring.

[0007] In one embodiment, an exhaust return air cylinder is fixed on the sealing cover of the discharge end cylinder, and the exhaust return air cylinder defines a closed return air chamber and exhaust chamber, and the return air chamber is arranged at one end close to the drum, and the rotating drive member is fixed at the right end of the exhaust return air cylinder, one end of the core cylinder is rotatably connected to the feed end cylinder through a first bracket, and the output end of the rotating drive member passes through the exhaust return air cylinder and is fixedly connected to the other end of the core cylinder.

[0008] In one embodiment, the heat recovery pipe includes a spiral tube as an input pipe and a straight tube as an output pipe. The straight tube is suspended on the axis of the spiral tube, and the output end of the spiral tube is connected to the input end of the straight tube. The heat recovery pipe is sleeved in the core tube, and the spiral tube is in contact with the core tube. The input end of the spiral tube extends into the return air cavity, and the output end of the straight tube extends into the exhaust cavity. The heat recovery pipe and the core tube are both made of heat-conducting material.

[0009] In one embodiment, a pressure relief valve is provided on the air outlet, and a drainage fan is provided on the air outlet.

[0010] In one embodiment, one end of the base is hinged to the frame, and a hydraulic cylinder is hinged between the other end and the frame.

[0011] In one embodiment, a spiral guide blade is provided on the inner peripheral wall of the drum near one end of the feed end cylinder, and the output end of the heater is connected to the drum from the left end of the feed end cylinder.

[0012] In summary, the present invention has the following beneficial effects: the present invention provides a coaxial core drum and a built-in heat recovery pipe, in conjunction with independent return air chambers and exhaust air chambers, to form a closed-loop hot air circulation system. High-temperature exhaust gas enters the heat recovery pipe through the return air chamber, and the core drum's inner wall is preheated by utilizing the core drum's heat conduction characteristics, so that heat energy is recovered from the exhaust gas and transferred to the core drum and the second lifting plate. The exhaust gas after secondary utilization is discharged from the exhaust port, thereby improving the utilization rate of heat energy. The drum and core drum dual-rotation structure is adopted, combined with the correspondingly distributed first and second lifting plates. When the drum rotates, the aggregate is radially scattered and dispersed in the drum, where it fully contacts the hot air from the heater to achieve preliminary dehydration. The aggregate then falls onto the second lifting plate, where it is contact-heated and dehydrated with the second lifting plate with higher heat and the outer wall of the core drum. The core drum then rotates, radially scattering the aggregate a second time and fully contacting the hot air again, thereby achieving further dehydration of the aggregate. At an inclined angle, the aggregate can undergo multiple rounds of this dehydration method before being finally discharged from the discharge port, effectively improving the dryness of the aggregate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural diagram of a construction waste recycled aggregate drying device according to an embodiment of the present application;

[0014] Figure 2 A schematic diagram of the internal structure and hot air flow path of a construction waste recycled aggregate drying device according to an embodiment of the present application;

[0015] Figure 3 This is a structural schematic diagram of the first material lifting plate, the second material lifting plate and the spiral material guide blades in the construction waste recycled aggregate drying device of an embodiment of the present application.

[0016] In the figure: 1. Frame; 2. Base; 3. Heater; 4. Feed end cylinder; 5. Roller; 6. Discharge end cylinder; 7. Feed port; 8. Discharge port; 9. Air outlet; 10. Exhaust port; 11. Induction fan; 12. Pressure relief valve; 13. Rotary drive member; 14. Return air chamber; 15. Exhaust chamber; 16. Core barrel; 17. Heat recovery pipe; 171. Spiral pipe; 172. Straight pipe; 18. First lifting plate; 19. Second lifting plate; 20. Spiral guide blade; 21. First bracket; 22. Support ring; 23. Gear ring; 24. Support roller; 25. First reduction motor; 26. Drive gear. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] like Figures 1 to 3 As shown, an embodiment of the present application provides a construction waste recycled aggregate drying device, comprising a frame 1 and a dryer body mounted on the frame 1 with an adjustable tilt angle. Specifically, the tilt angle is adjusted by a base 2 hinged to the frame 1 at one end and a hydraulic cylinder hinged between the other end and the frame 1. For details, refer to the structural principles of a lifting ramp. The hydraulic cylinder is controlled by a conventional PLC controller, the specific method of which is not described in detail in this embodiment. Furthermore, a heater 3 is provided on the dryer body. The heater 3 utilizes conventional technology and can be, for example, an electric heater 3 with a blower or a gas burner with a blower. The dryer body includes a drum 5, a feed inlet 7, a discharge outlet 8, and an air outlet 9 located above the discharge outlet 8. A rotatable core 16 is coaxially disposed within the drum 5. A first lifting plate 18 is disposed on the inner wall of the drum 5, and a second lifting plate 19 is disposed on the outer wall of the core 16, corresponding to the first lifting plate 18. The core 16 is driven by a rotary drive 13, which can be, for example, a second reduction motor. A heat recovery pipe 17 is provided in the core tube 16, and a return air chamber 14 and an exhaust air chamber 15 are provided on the side of the discharge port 8, which are independent of each other. The air outlet 9 is connected to the return air chamber 14 through a pipeline, and the exhaust air chamber 15 is provided with an exhaust port 10. The two ends of the heat recovery pipe 17 are respectively connected to the return air chamber 14 and the exhaust air chamber 15.

[0019] Specifically, the dryer body also includes a base 2, and the two ends of the base 2 are respectively provided with a feed end cylinder 4 and a discharge end cylinder 6. The feed end cylinder 4 and the discharge end cylinder 6 are provided with a sealing cover at the end away from the drum 5. The feed port 7 is arranged at the top of the feed end cylinder 4, the discharge end cylinder 6 is provided with a discharge port 8 at the bottom and an air outlet 9 at the top. The drum 5 is rotatably connected between the feed end cylinder 4 and the discharge end cylinder 6, and a support ring 22 and a gear ring 23 are coaxially provided on its outer wall. The base 2 is provided with a supporting wheel 24 that rolls with the support ring 22 and a first reduction motor 25 with a drive gear 26. The drive gear 26 is fixed to the output end of the first reduction motor 25, and the drive gear 26 is meshed with the gear ring 23.

[0020] Specifically, an exhaust return air cylinder is fixed on the sealing cover of the discharge end cylinder 6, and a closed return air chamber 14 and an exhaust chamber 15 are defined in the exhaust return air cylinder. The return air chamber 14 is arranged at one end close to the drum 5, and the rotating drive member 13 is fixed at the right end of the exhaust return air cylinder. One end of the core cylinder 16 is rotatably connected to the feed end cylinder 4 through the first bracket 21, and the output end of the rotating drive member 13 passes through the exhaust return air cylinder and is fixedly connected to the other end of the core cylinder 16.

[0021] When the drying device is working, the dryer body is adjusted to a preset inclination angle by controlling the extension and retraction of the piston rod of the hydraulic cylinder to ensure that the axis of the drum 5 forms an optimal aggregate conveying slope with the horizontal plane. The first reduction motor 25 is started, and the drum 5 is rotated by the drive gear 26 and the ring gear 23. At the same time, the core drum 16 forms a differential rotation with the drum 5 under the drive of the rotary drive member 13. Specifically, the linear speed of the core drum 16 is kept greater than or equal to the linear speed of the drum 5. The heater 3 is started, and hot air is blown from the feed end drum 4 to the discharge end drum 6.

[0022] The aggregate to be dried enters the drum 5 through the feed port 7 at the top of the feed end cylinder 4. The sealing cover ensures the airtightness of the connection between the feed end cylinder 4 and the drum 5 to prevent hot air leakage. The aggregate moves downward along the inclined drum 5 under the action of gravity, and at the same time, the centrifugal force generated by the rotation of the drum 5 forms a material curtain. During the rotation of the drum 5, the first lifting plate 18 lifts the aggregate to form a first material curtain. At the same time, the second lifting plate 19 on the outer wall of the core tube 16 forms a staggered movement with the first lifting plate 18, heating the aggregate in a contact manner and scattering it for a second time, so that the aggregate presents a three-dimensional rolling state in the drum 5, greatly increasing the contact area between the aggregate and the hot air.

[0023] The hot and humid air that has completed the heat exchange is discharged from the air outlet 9 at the top of the cylinder 6 at the discharge end, enters the return air chamber 14 through the pipeline, and enters from one end of the heat recovery pipe 17 to perform indirect heat exchange with the outer wall of the core tube 16. After releasing the latent heat in the heat recovery pipe 17, the hot and humid air enters the exhaust chamber 15 from the other end of the heat recovery pipe 17 and is finally discharged through the exhaust port 10.

[0024] The dried aggregate is discharged from the discharge port 8 at the bottom of the discharge end cylinder 6. A vibration screening device (not shown in the figure) can be set at the discharge port 8 for graded collection. The exhaust gas discharged from the exhaust chamber 15 can be connected to the dust removal system (not shown in the figure) for purification to meet environmental emission requirements.

[0025] The above method forms a closed-loop hot air circulation system by setting a coaxial core barrel 16 and a built-in heat recovery pipe 17, and cooperating with the independent return air chamber 14 and exhaust air chamber 15. The high-temperature exhaust gas enters the heat recovery pipe 17 through the return air chamber 14, and the heat conduction characteristics of the core barrel 16 are used to preheat the inner wall of the core barrel 16, so that the heat energy is recovered from the exhaust gas for a second time and transferred to the core barrel 16 and the second lifting plate 19. The exhaust gas after secondary use is discharged from the exhaust port 10, which effectively reduces the exhaust temperature and improves the utilization rate of heat energy. The double-rotating structure of the drum 5 and the core barrel 16 is adopted, combined with the corresponding distribution of the first lifting plate Plate 18 and the second lifting plate 19, when the drum 5 rotates, the aggregate is radially thrown and dispersed in the drum 5 and fully contacted with the hot air from the heater 3 to achieve preliminary dehydration, and then the aggregate falls onto the second lifting plate 19, and is subjected to contact heating and dehydration with the second lifting plate 19 with higher heat and the outer wall of the core barrel 16, and then the core barrel 16 rotates, and the aggregate is radially thrown for a second time and is fully contacted with the hot air again, so as to achieve further dehydration of the aggregate, and at an inclined angle, the aggregate can undergo multiple rounds of dehydration in this way and finally be sent out from the discharge port 8, which effectively improves the dryness of the aggregate.

[0026] In this embodiment, the heat recovery pipe 17 includes an internally hollow spiral tube 171 as an input tube and an internally hollow straight tube 172 as an output tube. The straight tube 172 is suspended on the axis of the spiral tube 171, and the output end of the spiral tube 171 is connected to the input end of the straight tube 172. The heat recovery pipe 17 is sleeved in the core tube 16, and the spiral tube 171 is in contact with the core tube 16. The input end of the spiral tube 171 extends into the return air chamber 14, and the output end of the straight tube 172 extends into the exhaust chamber 15. The side walls of the core tube 16 are respectively provided with through holes for the input and output ends of the spiral tube 171 to extend, while maintaining the overall sealing of the core tube 16 and the heat recovery pipe 17. The heat recovery pipe 17 and the core tube 16 are both made of heat-conducting materials, specifically copper or aluminum.

[0027] When the above-mentioned heat recovery pipe 17 is working, the hot air flow in the return air chamber 14 enters from the spiral hollow pipe of the spiral tube 171 and flows along the spiral path. The spiral structure prolongs the residence time of the air flow in the pipe. At the same time, the heat is continuously transferred to the core tube 16 through the contact between the wall of the spiral tube 171 and the core tube 16. The air flow after cooling through the spiral tube 171 enters the straight tube 172 and flows in a straight line along the axis to the exhaust chamber 15. The straight tube 172 is suspended at the axis of the spiral tube 171 to avoid secondary contact with the spiral tube 171, thereby ensuring that the cooled air flow is quickly discharged and reducing heat backflow.

[0028] In this embodiment, a pressure relief valve 12 is provided on the air outlet 9, and a induced draft fan 11 is provided on the exhaust port 10. By providing the pressure relief valve 12, when the internal pressure in the heat return pipe 17 abnormally increases due to air flow fluctuations or a sudden increase in exhaust resistance, the pressure relief valve 12 automatically opens to release excess pressure, thereby preventing the core tube 16 or the heat return pipe 17 from deformation or seal failure due to overpressure, which is beneficial to ensuring the safety of the drying device. During normal operation, the pressure relief valve 12 can be partially opened to adjust the air volume to match the system heat load requirements and reduce ineffective energy consumption. The induced draft fan 11 increases the negative pressure of the exhaust chamber 15 through active suction, forming a stable pressure gradient with the return air chamber 14, avoiding air backflow or stagnation, and ensuring a continuous and efficient heat exchange process.

[0029] In this embodiment, a spiral guide blade 20 is provided on the inner wall of the drum 5 near one end of the feed end cylinder 4, so that the aggregate can move evenly toward the discharge end cylinder 6 when entering, and the output end of the heater 3 is connected to the drum 5 from the left end of the feed end cylinder 4.

[0030] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the principles of the present invention are within the scope of protection of the present invention. It should be noted that improvements and modifications that do not depart from the principles of the present invention are within the scope of protection of the present invention.

Claims

1. A construction waste recycled aggregate drying device, comprising a frame (1), a dryer body mounted on the frame (1) with an adjustable inclination angle, and a heater (3) provided on the dryer body, wherein the dryer body comprises a drum (5), a feed port (7), a discharge port (8), and an air outlet (9) located above the discharge port (8), and is characterized in that: A rotatable core barrel (16) is coaxially provided in the drum (5), a first material lifting plate (18) is provided on the inner wall of the drum (5), and a second material lifting plate (19) is provided on the outer wall of the core barrel (16) and is distributed correspondingly to the first material lifting plate (18). The core barrel (16) is driven by a rotating driving member (13), a heat recovery pipe (17) is provided in the core barrel (16), and a return air chamber (14) and an exhaust air chamber (15) are provided on the side of the discharge port (8), the air outlet (9) is connected to the return air chamber (14) through a pipeline, and the exhaust air chamber (15) is provided with an exhaust port (10), and the two ends of the heat recovery pipe (17) are connected to the return air chamber (14) and the exhaust air chamber (15) respectively. ), the heat recovery pipe (17) includes a spiral pipe (171) as an input pipe and a straight pipe (172) as an output pipe, the straight pipe (172) is suspended on the axis of the spiral pipe (171), and the output end of the spiral pipe (171) is connected to the input end of the straight pipe (172), the heat recovery pipe (17) is sleeved in the core tube (16), and the spiral pipe (171) is in contact with the core tube (16), the input end of the spiral pipe (171) extends into the return air chamber (14), and the output end of the straight pipe (172) extends into the exhaust air chamber (15), and the heat recovery pipe (17) and the core tube (16) are both made of heat-conducting material.

2. The construction waste recycled aggregate drying device according to claim 1, characterized in that: The dryer body also includes a base (2), and the two ends of the base (2) are respectively provided with a feed end cylinder (4) and a discharge end cylinder (6), and the ends of the feed end cylinder (4) and the discharge end cylinder (6) away from the drum (5) are both provided with a sealing cover, the feed port (7) is provided at the top of the feed end cylinder (4), the discharge end cylinder (6) is provided with a discharge port (8) at the bottom and an air outlet (9) at the top, the drum (5) is rotatably connected between the feed end cylinder (4) and the discharge end cylinder (6), and the outer wall thereof is coaxially provided with a support ring (22) and a gear ring (23), the base (2) is provided with a supporting wheel (24) that is in rolling cooperation with the support ring (22) and a first reduction motor (25) with a driving gear (26), and the driving gear (26) is meshed with the gear ring (23).

3. The construction waste recycled aggregate drying device according to claim 2, characterized in that: An exhaust return air cylinder is fixed on the sealing cover of the discharge end cylinder (6), and a closed return air chamber (14) and an exhaust air chamber (15) are defined in the exhaust return air cylinder. The return air chamber (14) is arranged at one end close to the drum (5), and the rotary drive member (13) is fixed to the right end of the exhaust return air cylinder. One end of the core cylinder (16) is rotatably connected to the feed end cylinder (4) through the first bracket (21), and the output end of the rotary drive member (13) passes through the exhaust return air cylinder and is fixedly connected to the other end of the core cylinder (16).

4. The construction waste recycled aggregate drying device according to claim 1, characterized in that: The air outlet (9) is provided with a pressure relief valve (12), and the air outlet (10) is provided with a flow-inducing fan (11).

5. The construction waste recycled aggregate drying device according to claim 2, characterized in that: One end of the base (2) is hinged to the frame (1), and a hydraulic cylinder is hinged between the other end and the frame (1).

6. The construction waste recycled aggregate drying device according to claim 2, characterized in that: A spiral guide blade (20) is provided on the inner peripheral wall of the drum (5) near one end of the feed end cylinder (4), and the output end of the heater (3) is connected to the inside of the drum (5) through the left end of the feed end cylinder (4).

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