Concrete aggregate drying apparatus

Abstract

The utility model relates to building material processing equipment technical field, concretely relates to a kind of concrete aggregate drying device, a kind of concrete aggregate drying device, including rack, as basic support structure;Cylinder subassembly, transversely in the upper portion of the rack, including the outer cylinder of static and the inner cylinder rotatably arranged in the outer cylinder inside;Driving assembly, is located in the outer cylinder one end, for driving the inner cylinder rotation;Drying assembly, arranged in the top of the rack, for the cavity between the outer cylinder and inner cylinder is transported hot air and forms circulating air current;Wherein, the inner cylinder inside is equipped with for turning over aggregate turning over structure;The drying assembly includes hot air blower, with the air outlet of hot air blower and the air inlet of hot air blower, the air outlet and air inlet tube, the air inlet tube is connected to the both ends side portion of the outer cylinder respectively, forms the air circulation path of diagonal arrangement.

Description

Technical Field

[0001] This utility model relates to the field of building material processing equipment technology, specifically to a concrete aggregate drying device. Background Technology

[0002] Concrete aggregates typically require drying before use to remove surface moisture, ensuring accurate mix proportions and final strength. Currently, the most common aggregate drying equipment is the drum dryer, which achieves drying through drum rotation and hot air contact.

[0003] However, existing drying devices of this type still have some obvious problems and drawbacks in practical applications: First, the thermal energy utilization rate is low, and the drying efficiency is poor. Most existing equipment has poor insulation performance, resulting in serious heat loss from the cylinder; moreover, hot air often passes through the material in one direction, and is discharged without sufficient heat exchange with the aggregate, resulting in a large waste of thermal energy and high energy consumption.

[0004] Secondly, the drying uniformity is poor. Traditional dryers have simple or inefficient internal tumbling structures, which easily leads to uneven heating of aggregates during the drying process. Some aggregates are over-dried while others still retain moisture, affecting the overall quality of the dried aggregates. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a concrete aggregate drying device to solve the problems of low thermal energy utilization and uneven aggregate drying in the prior art. The concrete aggregate drying device of this utility model achieves high efficiency, energy saving and uniform drying in the concrete aggregate drying process by using a heat preservation structure and closed-loop hot air circulation, combined with a rotating inner cylinder and its turning mechanism.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: a concrete aggregate drying device, including a frame as a basic support structure; a cylinder assembly, horizontally placed on the upper part of the frame, including a stationary outer cylinder and an inner cylinder rotatably disposed inside the outer cylinder; a drive assembly, disposed at one end of the outer cylinder, for driving the inner cylinder to rotate; a drying assembly, arranged on the top of the frame, for conveying hot air into the cavity between the outer cylinder and the inner cylinder and forming a circulating airflow; wherein, the inner cylinder is provided with a turning structure for turning the aggregate; the drying assembly includes a hot air blower, an air outlet pipe connected to the outlet of the hot air blower, and an air inlet pipe connected to the inlet of the hot air blower, the air outlet pipe and the air inlet pipe being respectively connected to the two ends of the outer cylinder to form a diagonally arranged airflow circulation path.

[0007] In the aforementioned concrete aggregate drying device, the outer cylinder is wrapped with a heat-insulating shell, and the space between the heat-insulating shell and the outer cylinder is filled with thermal insulation material.

[0008] The concrete aggregate drying device described above has a reinforcing structure at the connection between the outer cylinder and the frame.

[0009] In the above-mentioned concrete aggregate drying device, the upper part of the end face of both ends of the outer cylinder is provided with multiple rollers, and the outer side of the inner cylinder is provided with an annular rolling belt that rolls with the rollers.

[0010] In the aforementioned concrete aggregate drying device, the turning structure consists of multiple axial grid strips uniformly welded along the circumference of the inner cylinder.

[0011] The aforementioned concrete aggregate drying device includes a drive assembly comprising a motor, a reducer connected to the motor output shaft, a gear output from the reducer, a gear ring fixed to the end of the inner cylinder, and a transmission belt connecting the gear and the gear ring.

[0012] In the aforementioned concrete aggregate drying device, the transmission belt is a synchronous belt.

[0013] In the aforementioned concrete aggregate drying device, the air inlet pipe is equipped with a filter screen for filtering air.

[0014] In the aforementioned concrete aggregate drying device, the outlet end of the inner cylinder is connected to a discharge hopper, and the bottom of the discharge hopper is equipped with a vibrating feeder for controlling the discharge.

[0015] The beneficial effects of this utility model are: 1. By setting up an insulation structure and a closed-loop hot air circulation path, the thermal energy utilization rate is significantly improved and energy consumption is reduced.

[0016] 2. By combining the inner cylinder rotation with the internal tumbling structure, the aggregate is heated more evenly, effectively improving the drying quality. Attached Figure Description

[0017] The present invention will be further described below with reference to the embodiments and examples.

[0018] Figure 1 This is a three-dimensional structural diagram of an embodiment.

[0019] Figure 2 This is a front view structural diagram of an embodiment.

[0020] Figure 3 This is a schematic diagram of the drying component structure in an embodiment.

[0021] Figure 4 This is a schematic diagram of the driver component structure in an embodiment.

[0022] Figure 5 This is a schematic diagram of the cylindrical assembly structure in an embodiment.

[0023] Figure 6This is a schematic diagram of the lath and grid structure of the cylindrical assembly.

[0024] In the diagram: 1. Frame; 2. Cylinder assembly; 21. Outer cylinder; 22. Inner cylinder; 23. Shell; 24. Slats; 25. Roller; 26. Roller belt; 27. Grid strip; 3. Drive assembly; 31. Base; 32. Motor; 33. Reducer; 34. Gear ring; 35. Gear; 36. Gear belt; 4. Drying assembly; 41. Hot air blower; 42. Air outlet pipe; 43. Air inlet pipe; 44. Filter screen. Detailed Implementation

[0025] This embodiment provides a concrete aggregate drying device, such as... Figure 1-6 As shown, the aggregate is dried efficiently by combining the rotation of the inner cylinder 22 with the circulation of hot air. The drying device consists of a frame 1, a cylinder assembly 2, a drive assembly 3, and a drying assembly 4. The frame 1 serves as the basic support structure and is welded from structural steel to ensure overall stability. The cylinder assembly 2 is placed horizontally on the upper part of the frame 1 and includes a stationary outer cylinder 21 and a rotating inner cylinder 22. The drive assembly 3 is located at one end of the outer cylinder 21 and is used to drive the inner cylinder 22 to rotate. The drying assembly 4 is arranged on the top of the frame 1 and achieves heat exchange through airflow circulation.

[0026] The outer cylinder 21 is made of carbon steel with open ends and is bolted to the inside of the frame 1. Angle steel is added to the connection between the outer cylinder 21 and the frame 1 to reinforce it and prevent deformation, according to load-bearing requirements. The outer cylinder 21 is wrapped with a heat-insulating shell 23, and a glass wool insulation layer is filled between the shell 23 and the outer cylinder 21 to reduce heat loss. Strips 24 are uniformly welded to the surface of the outer cylinder 21 and bolted to the shell 23, forming a detachable structure for easy maintenance. Six T-shaped rollers 25 are evenly arranged on the upper part of the axial end faces of the outer cylinder 21, and the rollers 25 are connected to the outer cylinder 21 via bearing seats. Its top arc surface rolls against the inner cylinder 22's roller 26, achieving circumferential support and axial limiting. The inner cylinder 22 is coaxially arranged inside the outer cylinder 21, made of stainless steel, with a cylinder wall thickness of 8mm. One end of the inner cylinder 22 is fixed with a toothed ring 34 by bolts, and the other end is an open design that connects to the discharge hopper. Multiple axial grid bars 27 are evenly welded circumferentially inside the inner cylinder 22. The grid bars 27 are 50mm high and are used to turn the aggregate to enhance the uniformity of drying. The upper part of the inner cylinder 22 is welded with an annular roller 26. The width of the roller 26 matches the contact surface of the roller 25 to ensure smooth rotation.

[0027] Drive assembly 3 includes a base 31, a motor 32, a reducer 33, a gear ring 34, a gear 35, and a toothed belt 36. The base 31 is horizontally welded to the top of one end of the outer cylinder 21. The motor 32 and the reducer 33 are fixed with bolts. The motor 32 is a three-phase asynchronous motor with a power of 15kW and a speed of 1450r / min. The reducer 33 is a worm gear type with a reduction ratio of 1:30. It is connected to the output shaft of the motor 32 through a coupling. The output shaft of the reducer 33 is keyed with a toothed belt. The gear 35 has a module of 3 and 20 teeth. The gear ring 34 is fixed to the end of the inner cylinder 22, with a module matching that of the gear 35 and 100 teeth. The gear 35 and the gear ring 34 are driven by a toothed belt 36, which is a synchronous belt to ensure no slippage during transmission. When working, after the motor 32 starts, it reduces the speed and increases the torque through the reducer 33 to drive the gear 35 to rotate. The toothed belt 36 drives the gear ring 34 and the inner cylinder 22 to rotate at a constant speed of 5 r / min, so as to realize the slow turning of the aggregate.

[0028] The drying assembly 4 includes a centrifugal hot air blower 41, an air outlet pipe 42, an air inlet pipe 43, and a plate and frame filter screen 44. The hot air blower 41 is located on the top of the frame 1, with a power of 22kW, an air volume of 5000m³ / h, and an air outlet temperature of 120℃. The air outlet pipe 42 and the air inlet pipe 43 are connected to the two ends of the blower, respectively. The diameter of the air outlet pipe 42 is 300mm, and the diameter of the air inlet pipe 43 is 250mm. The air outlet pipe 42 is inserted into the side of one end of the outer cylinder 21, and the air inlet pipe 43 is connected to the side of the other end of the outer cylinder 21, forming a diagonal airflow circulation. In the loop path, a plate and frame filter screen 44 is connected in series at the inlet of the air inlet pipe 43. The filter screen 44 has a precision of 50μm and is used to filter dust and impurities in the air. During operation, after the hot air blower 41 is started, the air outlet pipe 42 draws out the air in the outer cylinder 21 and heats it. The hot air is reinjected into the cavity between the outer cylinder 21 and the inner cylinder 22 through the air inlet pipe 43. The hot air comes into contact with the aggregate through the cylinder wall of the inner cylinder 22. After the aggregate absorbs heat, the moisture evaporates. The humid air is drawn back to the hot air blower 41 by the air outlet pipe 42 for reheating, forming a closed-loop drying cycle.

[0029] Aggregate drying process: The aggregate to be dried enters the inner cylinder 22 through the feed hopper. A gate valve is installed at the bottom of the feed hopper to control the feeding speed at 3t / h. The inner cylinder 22 rotates at a speed of 5r / min. The grid bars 27 turn the aggregate to make it evenly dispersed. The hot air blower 41 continuously blows 120℃ hot air into the cavity. The hot air exchanges heat with the aggregate through the cylinder wall of the inner cylinder 22 (the cylinder wall thickness is 5mm and the thermal conductivity is 45W / (m·K)). The surface moisture of the aggregate evaporates quickly. The dried aggregate moves to the discharge hopper with the rotation of the inner cylinder 22. A vibrating feeder can be installed at the bottom of the discharge hopper to control the discharge speed to match the feeding speed and ensure continuous operation.

Claims

1. A concrete aggregate drying device, characterized in that: include The frame serves as the basic support structure; The cylinder assembly is horizontally placed on the upper part of the frame and includes a stationary outer cylinder and an inner cylinder rotatably disposed inside the outer cylinder; A drive assembly, located at one end of the outer cylinder, is used to drive the inner cylinder to rotate; A drying assembly, located at the top of the frame, is used to deliver hot air into the cavity between the outer and inner cylinders and to form a circulating airflow. The inner cylinder is equipped with a turning structure for turning the aggregate; the drying component includes a hot air blower, an air outlet pipe connected to the outlet of the hot air blower, and an air inlet pipe connected to the inlet of the hot air blower. The air outlet pipe and the air inlet pipe are respectively connected to the two ends of the outer cylinder to form a diagonally arranged airflow circulation path.

2. The concrete aggregate drying device according to claim 1, characterized in that: The outer cylinder is wrapped with a heat-insulating shell, and the space between the heat-insulating shell and the outer cylinder is filled with heat-insulating material.

3. The concrete aggregate drying device according to claim 1, characterized in that: The connection between the outer cylinder and the frame is reinforced.

4. The concrete aggregate drying apparatus of claim 1, wherein: The outer cylinder has multiple rollers on the upper part of its axial ends, and the inner cylinder has an annular rolling belt that rolls with the rollers on its outer side.

5. The concrete aggregate drying apparatus of claim 1, wherein: The flipping structure consists of multiple axial grid strips uniformly welded along the circumference of the inner cylinder.

6. The concrete aggregate drying device according to claim 1, characterized in that: The drive assembly includes a motor, a reducer connected to the motor output shaft, a gear output by the reducer, a gear ring fixed to the end of the inner cylinder, and a transmission belt connecting the gear and the gear ring.

7. The concrete aggregate drying device according to claim 6, characterized in that: The transmission belt is a synchronous belt.

8. The concrete aggregate drying device according to claim 1, characterized in that: The air intake pipe is equipped with a filter screen for filtering air.

9. The concrete aggregate drying apparatus of claim 1, wherein: The inner cylinder is connected to a discharge hopper at its outlet end, and a vibrating feeder for controlling the discharge is provided at the bottom of the discharge hopper.

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