Multipurpose dryer for drying sticky materials

Abstract

A multi-purpose drying machine that can be used for drying sticky materials includes a large drum and a drying cylinder. The drying cylinder is characterized in that the drying cylinder is a tube bundle composed of three cylinders of different diameters bundled together, the feed port is connected to the beginning of the small drying cylinder, the end of the small drying cylinder is connected to the beginning of the middle drying cylinder, the end of the middle drying cylinder is connected to the beginning of the large drying cylinder, and the end of the large drying cylinder is connected to the discharge port. The diameter of the drying cylinder of the present invention gradually increases, so that the running time of the hot air carrying the wet material in each drying cylinder is not equal, that is, it gradually slows down, tends to be consistent with the material drying characteristics, and improves the drying efficiency. It can prevent sticky materials from sticking to the contact parts in the dryer; it is easy to disassemble and repair; it can be used to dry pastes, powders, and granular materials with different moisture contents; the anti-stick coating processing and curing process can be carried out using the system's own heating and cooling system, which greatly saves manufacturing and maintenance costs.

Description

Technical Field

[0001] The invention belongs to a drying device, in particular to a multi-purpose drying machine for sticky materials. Background Art

[0002] At present, there are two main forms of commercial drum dryers: one is a single drum dryer, whose structure is: a copy plate is welded on the inner wall of a cylinder of equal diameter, and rollers are installed at both ends of the outer wall of the cylinder. The rollers at both ends fall on the four support wheels at both ends. There are two transmission methods: one is that the support wheel is driven by the motor through the reducer to rotate, and the drum is driven to rotate by friction; the other is that a large gear ring is installed in the middle of the outside of the drum, and the small gear meshing with it is driven by the motor through the reducer, so that the drum rotates at a certain speed, and the wet material is sucked into the drum by hot air through one end of the drum for heat exchange. The wet material is dehydrated to the standard and discharged from the other end of the drum for air-material separation, thereby completing the drying process. It has a simple structure, convenient maintenance and strong adaptability. However, the problem is that the cross-sectional area of ​​the drum is the same, the wind speed is constant, and the material travel speed in the drum is basically unchanged, which is not compatible with the characteristics of the material in the drying process (decreasing drying rate), so the drying efficiency is low, and the drum is long, occupies a large area, and is easy to stick to the wall when used for sticky materials.

[0003] The other is a multi-ring drum dryer, which has a structure of three drying drums of different diameters, and the transmission method is the same as that of a single drum. Hot air drives the wet material to be sucked in from one end of the inner drying drum, transferred to the middle drum at the other end, and transferred to the large drum at the end, and finally discharged from the end of the large drum to separate the air and the material, thus completing the drying process. In this structure, due to the different cross-sectional areas of the three set drums, the cross-sectional area gradually increases from the inner drum → the middle drum → the large drum, so that the hot air drives the material to move at different speeds in the three drums, that is, the inner drum has a fast speed, the middle drum is second, and the outer drum is the slowest, which is consistent with the characteristics of the wet material in the drying process. Therefore, the drying intensity is high, the thermal efficiency is high, and the floor space is small. However, there are problems: the volume is large, and the sticky material is easy to stick to the wall when drying. It is difficult to clean and overhaul, especially for small machines, which are almost impossible to overhaul and clean.

[0004] Drying sticky materials is a difficult problem in the drying industry. We tried to solve the wall-sticking problem by spraying polytetrafluoroethylene at the contact point of the material. The existing problem is that after spraying, it needs to be cured at high temperature in a heating furnace. The dryer parts are large and it is difficult to find a corresponding heating furnace. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-purpose dryer that can be used for sticky materials. Three drying cylinders are provided, and the diameters of the three drying cylinders gradually increase, so that the running time of hot air carrying wet materials in each drying cylinder is different, that is, it gradually slows down, tends to be consistent with the material drying characteristics, and improves the drying efficiency. It can be applied to the drying of sticky materials, that is, it can prevent sticky materials from sticking to the contact parts in the dryer; it is easy to disassemble and assemble, and it is suitable for timely maintenance when the anti-stick coating is worn; the high-temperature sintering and curing process of the anti-stick coating can be carried out after the drying system is installed, using the system's own heating and cooling system, which greatly saves manufacturing and maintenance costs. It can be applied to the drying of pastes, powders, and granular materials with different moisture contents, and is particularly suitable for the drying of sticky materials.

[0006] The technical scheme provided by the present invention is as follows: it comprises a large drum, a drying drum, a support frame equipped with a group of supporting wheels and a driving reduction mechanism, and is characterized in that: the drying drum is composed of three cylinders with copying plates welded on the inner walls, an adjusting tube sandwiched between cylinders of different diameters, and a tube bundle formed by being bundled together in parallel, the tube bundle is covered with a large drum, and inlets and outlets are respectively arranged on the two end plates of the large drum along the axial position, the inlet is connected to the beginning of the small drying drum through a neck with the same diameter as the small drying drum, the end of the small drying drum is connected to the beginning of the middle drying drum through a straight cylinder, the end of the middle drying drum is connected to the beginning of the large drying drum through a straight cylinder, the end of the large drying drum is connected to the outlet through a neck with the same diameter as the large drying drum, two rollers are arranged on the outer walls of the two ends of the large drum, the large drum is seated on the group of supporting wheels of the supporting frames at the two ends through the rollers, the supporting wheels are driven to rotate by a motor through a reducer, and the large drum is driven to rotate by friction.

[0007] The inner diameter ratio of the above three drying cylinders with different diameters, small, medium and large, is 2:3:4.

[0008] The assembly structure of the above-mentioned integral tube bundle is as follows: reinforcing ribs are arranged on the tube wall of each tube, and tie bars are welded between the reinforcing ribs of each tube.

[0009] In the above structure, all the parts whose surfaces are in contact with the materials are coated with a polytetrafluoroethylene anti-sticking layer on the contact surface with the materials.

[0010] In the above structure, all the connection parts between the surface and the material contact parts adopt a detachable connection structure, that is, flange and bolt connection;

[0011] The method of coating the contact surface of the above-mentioned part in contact with the material with a polytetrafluoroethylene anti-stick layer is as follows: before assembly, polytetrafluoroethylene is coated on the contact surface with the material, and the drying system is assembled at the use site. Before starting the machine, hot air from the drying system is blown in to make its temperature reach the curing temperature of polytetrafluoroethylene, that is, hot air at 420°C to 450°C is introduced, and it is kept for about 30 minutes to solidify before cold air is introduced for sintering and solidification to achieve a non-stick effect.

[0012] The positive effects of the present invention are as follows: 1. The diameters of the three rollers gradually increase, so that the running time of the hot air carrying the wet material in each drying cylinder is different and gradually slows down, which is consistent with the drying characteristics of the material, and the drying efficiency is greatly improved. 2. The parts in the dryer that contact the material are all coated with an anti-stick coating, which is suitable for drying sticky materials. 3. All parts in the whole machine with an anti-stick coating are easy to disassemble and assemble, so as to adapt to timely maintenance when the anti-stick coating is worn. 4. The processing and maintenance of the anti-stick coating and the high-temperature sintering and curing process are carried out using the system's own heating and cooling system, which greatly saves manufacturing and maintenance costs. 5. The dryer of the present invention can be used for drying pastes, powders, and granular materials with different moisture contents. It is particularly suitable for drying sticky materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an external schematic diagram of the present invention.

[0014] Figure 2 yes Figure 1 Right view of .

[0015] Figure 3 It is a schematic diagram of the internal integral tube bundle structure of the present invention.

[0016] Figure 4 It is a schematic diagram of the structure in which the internal integral tube bundle of the present invention is assembled in a large drum.

[0017] Figure 5 yes Figure 4 M-M section view.

[0018] Figure 6 It is a three-dimensional schematic diagram of a single-section drying drum.

[0019] Figure 7 It is a schematic diagram of the angle between a single lift plate in the drying drum and the axis of the drum.

[0020] Figure 8 It is a schematic diagram of the shape of a single copy board.

[0021] Fig. 9 yes Figure 8 Right view of .

[0022] The serial numbers of the parts in the figure are as follows: feed port 1, large roller 2, large drum 3, discharge port 4, power transmission device 5, transmission support roller 6, support roller frame 7, connection neck between feed port and small drying cylinder 8, drying cylinder end cover 9, large drying cylinder 10, tensioning rod 11, connecting flange 12, reinforcing rib 13, middle drying cylinder 14, connecting straight cylinder 15, small drying cylinder 16, connection neck between discharge port and large drying cylinder 17, adjusting pipe 18, copying plate 19. DETAILED DESCRIPTION

[0023] See Figure 1-5The specific structure is as follows: the drying cylinder is a tube bundle consisting of three small, medium and large drying cylinders 16, 14 and 10 of different diameters, with an adjusting tube 18 sandwiched between them, and the tube bundle is formed in parallel. Its connection structure is: a reinforcing rib 13 is welded on the outer wall of each drying cylinder, and a tie rod 11 is welded between the reinforcing ribs 13 of each cylinder. The large drum 3 is set outside the tube bundle and connected to the tube bundle as a whole. In order to make the reinforcing ribs of the large, medium and small drying cylinders tangent to the inner wall of the large drum and ensure that the center of gravity of the rotary drum coincides with its axis, an adjusting tube 18 is set between the three drying cylinders, which intersects with the three drying cylinders and has an axis parallel to them. The two ends of the large drum 3 are connected to the end plates by bolts, and the inlet and outlet ports 1 and 4 are respectively installed on the two end plates along the axial position. The inlet port 1 is connected to the beginning of the small drying cylinder 16 through a bend neck 8 with the same diameter as the small drying cylinder, the end of the small drying cylinder 16 is connected to the beginning of the middle drying cylinder 14 through a straight cylinder 15, the end of the middle drying cylinder 14 is connected to the beginning of the large drying cylinder 10 through a straight cylinder (not shown in the figure), and the end of the large drying cylinder 10 is connected to the outlet port 4 through a bend neck 17 with the same diameter as the large drying cylinder. The ends of each drying cylinder are sealed with an end cover 9.

[0024] See Figure 1 Two rollers 2 are installed on the outer walls of both ends of the large drum 3. The large drum 3 is seated on a group of supporting wheels 6 on the supporting frames 7 at both ends through the two rollers 2. The supporting wheels 6 are driven to rotate by the motor through the reducer 5, and the large drum 3 is driven to rotate through friction.

[0025] See Figure 5-9 Each drying cylinder has a lifting plate 19 welded to its inner wall. To ensure smooth material flow, a slope is provided at the material-facing end of the lifting plate (see Figure 8 ), the slope angle is 150 degrees. At the same time, the copy board 19 is provided with a front folding plate (see Figure 8 , 9 ), the forward folding angle is 150 degrees; 4-8 copying plates are evenly distributed in the circumference of each drying cylinder, and the copying plate 19 is set in a spiral direction in the drying cylinder, that is, along the forward direction of the material, the angle with the horizontal is 3° (see Figure 7 ), when the cylinder rotates, it pushes the material forward.

[0026] In the above structure, all surfaces of the parts in contact with the materials shall be sprayed with polytetrafluoroethylene (anti-stick material). In order to facilitate disassembly and timely maintenance when the anti-stick coating is worn, the connection parts of these parts shall adopt a detachable connection structure, that is, flange and bolt connection; the main connection parts include as follows: the small, medium and large drying cylinders 16, 14, 10 are all connected in multiple sections by flanges 12 and bolts, the feed port 1 is connected to the beginning of the small drying cylinder 16 through the elbow 8, the end of the small drying cylinder 16 is connected to the beginning of the medium drying cylinder 14 by a straight cylinder 15, the end of the medium drying cylinder 14 is connected to the beginning of the large drying cylinder 10 by a straight cylinder, and the end of the large drying cylinder 10 is connected to the discharge port 4 by an elbow 17.

[0027] The method of coating the contact surface of the above-mentioned parts in contact with the material with a polytetrafluoroethylene anti-stick layer is as follows: before assembling parts in the factory, the contact surface of these parts with the material is sprayed with a polytetrafluoroethylene anti-stick coating, that is, the surface of the parts in contact with the material is subjected to sandblasting → dust blowing → primer spraying → curing → spraying polytetrafluoroethylene (anti-stick material), and then the drying system is assembled at the use site. After the installation is completed, before starting the machine, hot air from the drying system is introduced to make its temperature reach the curing temperature of polytetrafluoroethylene, that is, hot air at 420°C to 450°C is introduced, and it is kept for about 30 minutes to allow it to cure before cold air is introduced for sintering and curing.

[0028] The dimensions of each part are: the diameters of the three drying drums are 200, 300, and 400 mm respectively, the diameter of the large drum is 1000 mm, the length is 6000 mm, the motor power is 1.5X2 kW. Volume: 1.82 cubic meters.

[0029] Drying materials: sticky initial water content 80% final water content 15%;

[0030] Water removal: 91 kg / hour;

[0031] Processing capacity: 120 kg / hour;

[0032] Drying intensity: 50 kg / m3 / hour;

[0033] Process: Start the motor, the whole tube bundle rotates at a certain speed, the hot air carries the wet material and is sucked in from the feed port, preheated in the small drying cylinder, and quickly heat exchanged until the end enters the middle cylinder. As the moisture content of the wet material decreases and the hot air temperature decreases, the heat exchange speed slows down. Since the cross-section of the middle drying cylinder is larger than that of the small drying cylinder, it is just adapted to it. At the end of the middle drying cylinder, the moisture content of the wet material is further reduced and it is in the speed reduction drying stage. The diameter of the large drying cylinder is increased to adapt to it. The dried material is discharged from the end outlet of the large drying cylinder for the next step of air-material separation, completing the entire drying process.

Claims

1. A multi-purpose drying machine for drying sticky materials, comprising a large drum (3), a drying cylinder, a support frame equipped with a group of supporting wheels and a driving and reducing mechanism, wherein: The inner diameter ratio of the three cylinders of small, medium and large diameters is 2:3:4; the diameters of the three cylinders (16, 14, 10) are gradually increased, so that the running time of the hot air carrying the wet material in each cylinder is different, that is, it gradually slows down, which is consistent with the drying characteristics of the material; the drying cylinder is composed of three cylinders with different diameters and welded with a copy plate (19) on the inner wall, and an adjusting tube (18) is sandwiched between the cylinders, which are parallel and bundled together to form a tube bundle, and the tube bundle is covered with a large drum (3), and the two end plates of the large drum (3) are respectively provided with inlet and outlet ports (1, 4) along the axial position, and the inlet port (1) is connected to the small drum (16) a neck turn (8) of equal diameter is connected to the beginning of the small cylinder (16), the end of the small cylinder (16) is connected to the beginning of the middle cylinder (14) by a straight cylinder, the end of the middle cylinder (14) is connected to the beginning of the large cylinder (10) by a straight cylinder, the end of the large cylinder (10) is connected to the discharge port (4) by a neck turn (17) of equal diameter to the large cylinder (10), two rollers are installed on the outer wall of both ends of the large cylinder (3), and the large cylinder (3) is seated on the group of supporting wheels of the supporting frames at both ends through the rollers, and the supporting wheels are driven to rotate by the motor through the reducer, and the large cylinder (3) is driven to rotate by the friction force; The material-facing end of the lifting plate (19) is provided with a slope, and the slope angle is 150°; at the same time, the lifting plate (19) is provided with a front folding plate, and the front folding angle is 150°; 4-8 lifting plates (19) are evenly distributed in the circumferential direction of each cylinder, and the lifting plates (19) are arranged in a spiral direction in the cylinder, that is, along the forward direction of the material, the angle with the horizontal is 3°, and the material is pushed forward when the cylinder body rotates.

2. The multi-purpose dryer for drying sticky materials according to claim 1, characterized in that: The assembly structure of the integral tube bundle is that reinforcing ribs (13) are arranged on the cylinder wall of each cylinder, and tie bars (11) are welded between the reinforcing ribs (13) of each cylinder.

3. The multi-purpose dryer for drying sticky materials according to claim 2, characterized in that: In the above structure, all the parts whose surfaces are in contact with the materials are coated with a polytetrafluoroethylene anti-sticking layer on the contact surface with the materials.

4. The multi-purpose dryer for drying sticky materials according to claim 2, characterized in that: In the above structure, all connection parts between the surface and the material contact parts adopt a detachable connection structure, that is, flange and bolt connection.

5. The multi-purpose dryer for drying sticky materials according to claim 4, characterized in that: The contact surface of the above-mentioned part in contact with the material is coated with a polytetrafluoroethylene anti-sticking layer. The coating method is to coat the contact surface with the material with polytetrafluoroethylene before assembly. The drying system is assembled at the use site. Before starting the machine, hot air from the drying system is blown in to make its temperature reach the curing temperature of polytetrafluoro, that is, hot air at 420°C to 450°C is introduced, and it is kept for 30 minutes to solidify before cold air is introduced for sintering and solidification to achieve a non-stick effect.

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