A roller dryer

Abstract

The present invention relates to a roller-disc type dryer, comprising a shell, the top of which is detachably provided with a cover, and the bottom of which is open; a drying disk is arranged at the open position, and forms a drying chamber with the shell; a feed inlet and an exhaust hole are defined at the top of the drying chamber, and a discharge port is defined at the bottom of the drying chamber; a drying roller rotatable on the top surface of the drying disk is provided in the drying chamber, the material to be dried enters the drying chamber through the feed inlet, a drying medium is introduced into the drying disk and the drying roller, and the drying roller rolls and dries the material to be dried spread on the drying disk. The present invention rolls the material to be dried using the drying roller and the drying disk, so that the material to be dried forms a dense material layer between the drying roller and the drying disk, and the material layer is in close contact with the heat exchange surface of the drying disk and the drying roller, and the heat transfer speed of the drying disk and the drying roller to the material to be dried is greatly improved, and the drying efficiency is improved several times compared with the traditional dryer.

Description

Technical Field

[0001] The invention relates to the technical field of drying powdery, paste-like and cake-like materials, and more particularly to a roller-type drying machine. Background Art

[0002] The drying process is the process of removing moisture from wet materials. Usually, a thermal physical method is used, that is, the wet materials are heated to evaporate the moisture in them to achieve the purpose of drying. Conventional heat transfer methods for drying equipment include convection heat transfer and conduction heat transfer. Convection heat transfer uses hot air, hot flue gas, superheated steam, hot inert gas, etc. as drying media. The drying medium is in direct contact with the wet material and transfers heat to the wet material through convection. In convection heat transfer, the drying medium is both a heat carrier and a moisture carrier. Conduction heat transfer uses heat transfer oil, steam, hot water, etc. as drying media. The drying medium does not directly contact the wet material and transfers heat to the wet material through heat conduction. In conduction heat transfer, the drying medium is only a heat carrier.

[0003] Since the latent heat of vaporization of water is very large, when the moisture content of the wet material is high, the drying process is a strong heat exchange process. Taking the evaporation of 1kg of water per second as an example, the heat exchange power is about 2300kw. Therefore, the current drying equipment has a very low processing capacity for materials with a high moisture content (80% moisture content).

[0004] The advantages of convection heat transfer drying equipment are fast heat exchange speed and single-machine processing capacity is greater than conduction heat transfer drying equipment. The disadvantages are that it consumes a large amount of drying medium and produces a large amount of dry exhaust gas. The heat utilization rate is lower than that of conduction heat transfer equipment, and the transportation cost of drying medium and exhaust gas treatment is also high. The advantages of conduction heat transfer drying equipment are large heat carrying capacity of drying medium, small amount of drying medium, and recycling; the heat utilization rate is higher than that of convection heat transfer equipment; the dry exhaust gas is significantly less than that of convection heat transfer equipment. The disadvantages are slow heat exchange speed and low single-machine processing capacity.

[0005] The commonly used conduction heat transfer dryers at present are double cone rotary dryers, disc dryers, rake dryers, and paddle dryers. In order to improve the contact between the material and the heat exchange surface, the traditional conduction heat transfer dryers mostly use a rotating rake to stir the material (disc dryer) or a heat conductive element to directly stir the material (such as a paddle dryer). The applicant has found through research that when the traditional dryer is working, the dried material and the surface of the heat conductive element are in a relatively "loose" contact state, or the dried material falls on the surface of the heat conductive element by its own gravity, or the heat conductive element stirs in the dried material. Since the contact state between the dried material and the surface of the heat conductive element is not "tight" enough, and there are also considerable gaps between the dried materials, the heat transfer coefficient is relatively low, generally 100-150W / (m 2 .℃) range.

[0006] Therefore, how to provide a dryer with high drying efficiency is a problem that those skilled in the art need to solve urgently. Summary of the invention

[0007] Therefore, the object of the present invention is to provide a roller dryer to solve the problem of low drying efficiency of the drying equipment in the prior art.

[0008] The present invention provides a roller-type drying machine, comprising:

[0009] A shell, wherein the top of the shell is provided with a detachable cover, and the bottom of the shell is open;

[0010] A drying plate, the drying plate is arranged at the open portion and forms a drying chamber with the shell; the top of the drying chamber defines a feed inlet and an exhaust hole, and the bottom of the drying chamber defines a discharge port;

[0011] And a drying roller, the drying chamber has the drying roller rotatable on the top surface of the drying plate, the material to be dried enters the drying chamber through the feed inlet, the drying medium is passed into the drying plate and the drying roller, and the drying roller rolls and dries the material to be dried spread on the drying plate.

[0012] It can be known from the above technical scheme that compared with the prior art, the present invention discloses a roller-disc dryer. The present invention utilizes a drying roller and a drying disk to roll the dried material, so that the dried material forms a dense material layer between the drying roller and the drying disk. The material layer is in close contact with the heat exchange surface of the drying disk and the drying roller, and the heat transfer rate from the drying disk and the drying roller to the dried material will be greatly improved. Since the drying roller and the drying disk roll the material, the dried material is rolled into a dense material layer, which not only improves the heat exchange efficiency between the material layer and the drying roller and the drying disk, but also improves the heat transfer rate within the material layer. The material layer that has not been rolled is loose and has a large number of gaps inside, which will hinder the transfer of heat within the material layer. Therefore, the heat transfer rate inside the dried material of the present invention will also be greatly improved, so the drying efficiency is improved several times compared with the traditional dryer.

[0013] Furthermore, the drying roller is dynamically connected to a roller frame transmission part through a roller frame, and the roller frame transmission part drives the roller frame and the drying roller to rotate around the center of the drying chamber.

[0014] Furthermore, the roller frame comprises a feed disc, a roller bracket and a lower scraper; the bottom of the feed disc is a receiving disc, the top of the receiving disc is connected to a connecting frame, the middle of the connecting frame forms a roller frame hollow shaft, the inside of the receiving disc is provided with an upper distributor, the top of the upper distributor passes through the roller frame hollow shaft, and is dynamically connected to the distributor transmission part, the feed port is arranged in the hollow distributor shaft in the middle of the upper distributor; the material to be dried falls into the middle of the receiving disc through the feed port, and is distributed by the upper distributor and falls into the top edge of the drying disc from the discharge port on the side wall of the receiving disc; multiple rows of roller brackets and multiple rows of lower scrapers are arranged at equal angles at the bottom of the receiving disc, the bottom of each row of roller brackets is rotatably connected to the drying roller, the lower scraper is opposite to the distribution direction of the upper distributor, and it scrapes the material to be dried on the top edge of the drying disc from the edge to the middle.

[0015] Furthermore, each row of the lower scrapers includes a plurality of connecting rods and a plurality of lower scraping plates, the top of each connecting rod is fixed to the bottom of the receiving tray, and the bottom of each connecting rod is fixed to one of the lower scraping plates.

[0016] Furthermore, the upper distributor includes: a circular connecting grid plate and an upper scraper; the middle of the circular connecting grid plate is the hollow distribution shaft, and a plurality of groups of upper scrapers are radially arranged at the bottom of the grid plate, and the installation angles of the upper scraper and the lower scraper are complementary.

[0017] Furthermore, a tangential angle A between the lower scraper and the radius line of the pitch circle where the lower scraper is located is 135°-160°.

[0018] Furthermore, the roller frame transmission part and the distributor transmission part have the same structure, and both include a transmission motor, a motor pulley, a transmission pulley and a belt; the transmission motor is vertically supported on the top of the cover body through a base, and its output end faces downward and is connected to the motor pulley, and the motor pulley is connected to the transmission pulley through the belt, and the transmission pulley is installed on the outer wall of the roller frame hollow shaft or the hollow distribution shaft, the roller frame hollow shaft rotates in the middle of the cover body through a slewing bearing, and the hollow distribution shaft rotates inside the roller frame hollow shaft through another slewing bearing.

[0019] Furthermore, the drying roller comprises an inner ring drying roller and an outer ring drying roller, which are rotatably supported on the roller bracket respectively, and the inner ring drying roller and the outer ring drying roller both adopt an inclined truncated cone-shaped roller body, and the roller body is in rolling contact with the drying plate, and the volume of the inner ring drying roller is smaller than that of the outer ring drying roller.

[0020] Furthermore, the drying plate includes: an upper plate, a lower plate, an inner vertical cylinder, an outer vertical cylinder and a reinforcing column; the upper plate and the lower plate are buckled together to form a plate drying chamber, a plurality of reinforcing columns are arranged between the drying chambers, the inner vertical cylinder passes through the middle of the plate drying chamber to form the discharge port, the plate drying chamber has a plate drying medium inlet on its circumference, the outer vertical cylinder is connected to the inside of the plate drying chamber, and extends downward from the plate drying chamber to form a plate drying medium outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0022] Figure 1 The accompanying drawing is a structural schematic diagram of a roller-type dryer provided by the present invention;

[0023] Figure 2 The accompanying drawings show a perspective view of the roller frame;

[0024] Figure 3 The accompanying drawings show a cross-sectional view of the roller frame;

[0025] Figure 4 The accompanying drawings show a bottom view;

[0026] Figure 5 The accompanying drawing shows a schematic diagram of the mechanism of the upper distributor;

[0027] Figure 6 The accompanying drawing shows a schematic diagram of the upper distributor in the roller frame;

[0028] Figure 7 The accompanying drawing shows a schematic diagram of the arrangement angle of the lower scraper;

[0029] Figure 8 The accompanying drawing shows a schematic structural diagram of the roller frame transmission part;

[0030] Fig. 9 The accompanying drawing shows a schematic structural diagram of a drying roller;

[0031] Fig.10 The accompanying drawing shows a schematic diagram of the structure of the drying plate;

[0032] Fig.11 The accompanying drawing shows a schematic diagram of the drying principle of a conventional drying device;

[0033] Fig.12 The accompanying drawing shows a schematic diagram of the drying principle of the present invention;

[0034] In the figure: 100-shell, 101-cover, 102-feeding port, 103-exhaust hole, 104-discharging port, 200-drying plate, 201-upper plate, 202-lower plate, 203-inner vertical cylinder, 204-outer vertical cylinder, 205-reinforcement column, 206-plate drying medium inlet, 300-drying roller, 301-roller heat exchange space, 302-first end panel, 303-second end panel, 304-roller surface, 305-pumping, 306-connecting shaft, 307-bearing, 400-roller frame, 40 1- roller frame transmission part, 4011- transmission motor, 4012- motor pulley, 4013- transmission pulley, 4014- belt, 4015- slewing bearing, 402- feed disc, 4021- discharge port, 403- roller bracket, 404- lower scraper, 405- roller frame hollow shaft, 406- upper distributor, 4061- distributor transmission part, 4062- hollow distribution shaft, 4063- circular connecting grid plate, 4064- upper scraper, G- drying chamber, W- material, J- liquid water. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0036] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] See attached Fig.11 It is a traditional dryer. The drying medium is saturated steam. The heat conducting element is a carbon steel plate (drying plate). The dried material is municipal sludge. When the steam is liquefied, the heat is transferred to the carbon steel plate, and then the heat is transferred to the wet sludge in contact with the carbon steel plate through the carbon steel plate. The wet sludge is dried on the surface of the carbon steel plate to form a thin layer of dry sludge. The heat continues to transfer through the dry sludge layer to dry the wet sludge. The carbon steel plate is a good conductor of heat with a thermal conductivity of 40W / (m.℃). The thermal conductivity of dry sludge (see Appendix B of the Code for Thermal Design of Civil Buildings GB50176-2016 for loose inorganic materials: boiler slag 0.29, fly ash 0.23, blast furnace slag 0.26) is about 0.23~0.29W / (m.℃). It can be seen that the thermal conductivity of loose dry sludge is very poor.

[0040] The applicant has conducted experimental research and found that Fig.12 , use the drying roller and drying plate to roll the dried material, so that the dried material forms a dense material layer between the drying roller and the drying plate, and the material layer is in close contact with the heat exchange surface of the drying plate and the drying roller, and the heat transfer rate from the drying plate and the drying roller to the dried material will be greatly increased. Because the dried material is rolled into a dense material layer, the heat transfer rate inside the dried material will also be greatly increased, so the drying efficiency is several times higher than that of traditional dryers.

[0041] Roller dryer Figure 1 , the drying roller and the drying plate are both heat-conducting elements, and the dried material is spread on the drying plate and rolled into a dense material layer by the drying roller. Specifically, the embodiment of the present invention discloses a roller-plate dryer, including: a housing 100, the top of the housing 100 is detachably provided with a cover 101, and the bottom is open; a drying plate 200, the drying plate 200 is arranged at the open position, and forms a drying chamber G with the housing 100; the top of the drying chamber G defines a feed inlet 102 and an exhaust hole 103, and the bottom of the drying chamber G defines a discharge port 104; and a drying roller 300, the drying chamber G has a drying roller 300 that can rotate on the top surface of the drying plate 200, the material W to be dried enters the drying chamber G through the feed inlet 102, the drying medium is introduced into the drying plate 200 and the drying roller 300, and the drying roller 300 rolls and dries the material W to be dried spread on the drying plate 200.

[0042] Advantageously, the drying roller 300 is connected to the roller frame transmission part 401 through the roller frame 400, and the roller frame transmission part 401 drives the roller frame 400 and the drying roller 300 to rotate around the center of the drying chamber G.

[0043] See attached Figure 2-4 The roller frame 400 includes a feed disc 402, a roller bracket 403 and a lower scraper 404; the bottom of the feed disc 402 is a receiving disc, the top of the receiving disc is connected to a connecting frame, the middle of the connecting frame forms a roller frame hollow shaft 405, the inside of the receiving disc is provided with an upper distributor 406, the top of the upper distributor 406 passes through the roller frame hollow shaft 405, and is connected to the distributor transmission part 4061 by power, and the feed port 102 is arranged in the hollow distribution shaft 4062 in the middle of the upper distributor 406; the material to be dried The material W falls into the middle of the receiving tray through the feed port 102, and is distributed by the upper distributor 406 and falls into the top edge of the drying tray 200 from the discharge port 4021 on the side wall of the receiving tray; multiple rows of roller brackets 403 and multiple rows of lower scrapers 404 are arranged at equal angles and cross-arranged at the bottom of the receiving tray, and a drying roller 300 is rotatably connected to the bottom of each row of roller brackets 403. The lower scraper 404 has a distribution direction opposite to that of the upper distributor 406, and it scrapes the material W to be dried on the top edge of the drying tray 200 from the edge to the middle.

[0044] See attached Figure 4 Each row of lower scrapers 404 includes a plurality of connecting rods and a plurality of lower scrapers. The top of each connecting rod is fixed to the bottom of the receiving tray, and the bottom of each connecting rod is fixed to a lower scraper.

[0045] See attached Figure 5 and 6 The upper distributor 406 includes: a circular connecting grid plate 4063 and an upper scraper 4064; the middle part of the circular connecting grid plate 4063 is a hollow distribution shaft 4062, and a plurality of groups of upper scrapers 4064 are radially arranged at the bottom of the grid plate. The installation angles of the upper scraper 4064 and the lower scraper are complementary. The functions of these two scrapers are one to push the material outward and the other to push the material inward, and the directions of pushing the material are opposite.

[0046] When the upper scraper contacts the material to be dried, it pushes the material outward from the circumference. The upper scrapers distributed on different diameters are combined together to push the material to be dried from the inner circle of the receiving plate to the outer circle gradually, and finally discharged from the discharge port and fall on the outer edge of the top of the drying plate. A lower scraper is also installed under the roller frame. Because the upper scraper and the lower scraper are installed in opposite directions, the lower scraper is responsible for pushing the material on the drying plate from the outer circle to the inner circle. When the material to be dried is evenly laid on the drying plate by the lower scraper, the material is in a relatively loose state, the material is not in close contact with the drying plate, the contact area is small, the heat transfer effect from the drying plate to the material is very poor, and there are many gaps inside the material, which seriously affects the heat transfer inside the material. The state at this time is equivalent to a disc dryer. The drying roller rotates around the center of the dryer with the roller frame to roll the material on the drying plate. Due to the friction with the rolled material, the drying roller rotates around its own axis. At this time, the loose materials on the drying plate are pressed into a dense material layer, and the drying plate and the drying roller transfer heat to the material layer from the upper and lower surfaces of the material layer at the same time, so the heat transfer effect is greatly improved.

[0047] After the material is rolled and dried by the drying roller, it is scraped from the drying plate by the lower scraper. The lower scraper rotates synchronously with the roller frame, and the upper scraper rotates synchronously with the upper distributor to push it to the inside of the drying plate. In this process, the material becomes loose again, and the inner and outer layers of the material are mixed, so that the heat exchange between the materials is sufficient. After that, it is rolled and dried by the next drying roller. After multiple cycles, the material meets the drying requirements and is discharged from the discharge port in the center of the drying plate. In order to ensure that the scraper can push the material smoothly, see the attached Figure 7 The tangent angle A between the lower scraper and the radius line of the pitch circle where it is located is 135°-160°. When the angle A is 90°, the scraper will neither push the material outward nor push the material inward. When the angle A is greater than 90°, the material is pushed outward, and when it is less than 90°, the material is pushed inward. The size of the angle will determine the speed of pushing the material. After testing, it was determined that when the angle A is 135°-160°, the pushing speed is fast.

[0048] See attached Figure 8 The roller frame transmission part 401 and the distributor transmission part 4061 have the same structure, both of which include a transmission motor 4011, a motor pulley 4012, a transmission pulley 4013 and a belt 4014; the transmission motor 4011 is vertically supported on the top of the cover body 101 through a base, and its output end faces downward and is connected to the motor pulley 4012, the motor pulley 4012 is connected to the transmission pulley 4013 through a belt 4014, and the transmission pulley 4013 is installed on the outer wall of the roller frame hollow shaft 405 or the hollow distribution shaft 4062, the roller frame hollow shaft 405 rotates in the middle of the cover body 101 through a slewing bearing 4015, and the hollow distribution shaft 4062 rotates inside the roller frame hollow shaft 405 through another slewing bearing 4015.

[0049] See attached Figure 8 and 9 The drying roller 300 includes an inner ring drying roller and an outer ring drying roller, which are rotatably supported on the roller bracket 403 respectively. The inner ring drying roller and the outer ring drying roller both adopt an inclined truncated cone-shaped roller body, and the roller body is in rolling contact with the drying plate 200. The volume of the inner ring drying roller is smaller than that of the outer ring drying roller.

[0050] The drying roller is divided into two circles, inner and outer, which can better adapt to the material thickness deviation, so that materials of different thicknesses can be effectively rolled. If only one drying roller is used, the large end of the drying roller will be very large, which will increase the volume of the entire equipment; the material thickness on the drying plate is uneven, and the rolling effect is not good.

[0051] See attached Fig. 9 In the embodiment of the present invention, the drying roller 300 comprises: a roller body, a roller heat exchange space 301 is formed inside the roller body, and shaft fixing holes are provided at both ends of the roller body, and a bearing 307 is provided at each set of shaft fixing holes; a connecting shaft 306 is rotatably connected with the bearing 307; the connecting shaft 306 is a hollow shaft; the connecting shaft 306 is fixed on the roller bracket 403, and the roller bracket 403 has a circulation channel for the drying medium, the circulation channel is connected with the connecting shaft 306 and the heat exchange space 301, and the circulation channel has a roller drying medium inlet 4031 and a roller drying medium outlet 4032. The roller body is in the shape of a truncated cone, and its contact working surface is flush with the horizontal plane.

[0052] Advantageously, the roller body is welded together by a first end panel 302, a second end panel 303 and a roller surface body 304. The roller surface body 304 is made of steel and has good heat transfer and rolling hardness.

[0053] The roller surface body 14 is formed by casting or by coiling and welding of plates.

[0054] Near the roller drying medium outlet 4032, the inner side of the connecting shaft 306 is provided with a water extraction pipe 305 with an opening facing downward, and the water extraction pipe 305 is connected to an external water extraction device. The liquid water J generated during the drying process is discharged through the water extraction pipe and the roller drying medium outlet. The water extraction pipe is fixed on the hollow connecting shaft and does not rotate with the roller. The water extraction port is always at the bottom and is as close to the inner surface of the tapered roller as possible while ensuring that it does not interfere with the inner surface of the tapered roller, so that the liquid water J in the drying roller can be extracted more thoroughly.

[0055] See attached Fig.10The drying plate 200 includes: an upper plate 201, a lower plate 202, an inner vertical tube 203, an outer vertical tube 204 and a reinforcing column 205; the upper plate 201 and the lower plate 202 are buckled together to form a drying chamber of the plate body, and a plurality of reinforcing columns 205 are arranged between the drying chambers. The inner vertical tube 203 passes through the middle of the drying chamber of the plate body to form a discharge port 104, and the drying chamber of the plate body has a drying medium inlet 206 on the circumference. The outer vertical tube 204 is connected to the inside of the drying chamber of the plate body and extends downward from the drying chamber of the plate body to form a drying medium outlet of the plate body. Saturated water vapor (drying medium) enters the drying plate from the drying medium inlet of the plate body, and when it encounters the inner wall of the drying plate whose temperature is lower than that of saturated steam, the water vapor condenses into liquid water and releases heat energy at the same time. The heat energy is transferred to the material to be dried through the upper plate, and the liquid water is discharged from the drying medium outlet of the plate body.

[0056] The present invention uses a drying roller and a drying plate to roll the dried material, so that the dried material forms a dense material layer between the drying roller and the drying plate, and the material layer is in close contact with the heat exchange surface of the drying plate and the drying roller, and the heat transfer rate from the drying plate and the drying roller to the dried material will be greatly improved. Since the drying roller and the drying plate roll the material, the dried material is rolled into a dense material layer, which not only improves the heat exchange efficiency between the material layer and the drying roller and the drying plate, but also improves the heat transfer rate in the material layer. The material layer that has not been rolled is loose and has a large number of gaps inside, which will hinder the transfer of heat in the material layer.

[0057] The present invention improves the contact state between the material to be dried and the surface of the heat exchange element by roller pressing, and also improves the internal state of the material to be dried, greatly improving the heat exchange efficiency. Therefore, the drying efficiency is several times higher than that of the traditional conduction heat transfer dryer.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0059] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A roller dryer, characterized in that: include: A housing (100), wherein the top of the housing (100) is provided with a detachable cover (101), and the bottom of the housing (100) is open; A drying plate (200), the drying plate (200) being arranged at the open portion and forming a drying chamber (G) with the housing (100); a feed inlet (102) and an exhaust hole (103) are defined at the top of the drying chamber (G), and a discharge port (104) is defined at the bottom of the drying chamber (G); and a drying roller (300), wherein the drying chamber (G) has the drying roller (300) rotatable on the top surface of the drying plate (200), the material to be dried (W) enters the drying chamber (G) through the feed inlet (102), a drying medium is introduced into the interior of the drying plate (200) and the drying roller (300), and the drying roller (300) rolls and dries the material to be dried (W) spread on the drying plate (200); The drying roller (300) is connected to a roller frame transmission part (401) by power through a roller frame (400), and the roller frame transmission part (401) drives the roller frame (400) and the drying roller (300) to rotate around the center of the drying chamber (G); The roller frame (400) comprises a feed disc (402), a roller bracket (403) and a lower scraper (404); the bottom of the feed disc (402) is a receiving disc, the top of the receiving disc is connected to a connecting frame, the middle of the connecting frame forms a roller frame hollow shaft (405), the inside of the receiving disc is provided with an upper distributor (406), the top of the upper distributor (406) passes through the roller frame hollow shaft (405), and is dynamically connected to the distributor transmission part (4061), the feed port (102) is arranged in the hollow distribution shaft (4062) in the middle of the upper distributor (406); the material to be dried (W) is passed through The feed inlet (102) falls into the middle of the receiving tray, and is distributed by the upper distributor (406) to fall into the top edge of the drying tray (200) from the discharge port (4021) on the side wall of the receiving tray; multiple rows of roller brackets (403) and multiple rows of lower scrapers (404) are arranged at equal angles and cross-arranged at the bottom of the receiving tray, and the bottom of each row of roller brackets (403) is rotatably connected to the drying roller (300), and the lower scraper (404) has a distribution direction opposite to that of the upper distributor (406), and scrapes the material (W) to be dried on the top edge of the drying tray (200) from the edge to the middle; Each row of the lower scrapers (404) comprises a plurality of connecting rods and a plurality of lower scrapers, the top of each connecting rod being fixed to the bottom of the receiving tray, and the bottom of each connecting rod being fixed to one of the lower scrapers; The upper distributor (406) includes: a circular connecting grid plate (4063) and an upper scraper (4064); the middle part of the circular connecting grid plate (4063) is the hollow distribution shaft (4062), and a plurality of groups of upper scrapers (4064) are radially arranged at the bottom of the grid plate, and the installation angles of the upper scraper (4064) and the lower scraper are complementary.

2. A roller dryer according to claim 1, characterized in that: The tangential angle A between the lower scraper and the radius line of the pitch circle where it is located is 135°-160°.

3. A roller dryer according to claim 1, characterized in that: The roller frame transmission part (401) and the distributor transmission part (4061) have the same structure, and both include a transmission motor (4011), a motor pulley (4012), a transmission pulley (4013) and a belt (4014); the transmission motor (4011) is vertically supported on the top of the cover body (101) through a base, and its output end faces downward and is connected to the motor pulley (4012), and the motor pulley (4012) is connected to the belt through the belt. (4014) is connected to the driving pulley (4013), and the driving pulley (4013) is installed on the outer wall of the hollow shaft (405) of the roller frame or the hollow cloth shaft (4062). The hollow shaft (405) of the roller frame rotates in the middle of the cover body (101) through a slewing bearing (4015), and the hollow cloth shaft (4062) rotates inside the hollow shaft (405) of the roller frame through another slewing bearing (4015).

4. A roller dryer according to claim 1, characterized in that: The drying roller (300) comprises an inner ring drying roller and an outer ring drying roller, which are rotatably supported on the roller support (403) respectively, and the inner ring drying roller and the outer ring drying roller both adopt an inclined truncated cone-shaped roller body, and the roller body is in rolling contact with the drying plate (200), and the volume of the inner ring drying roller is smaller than that of the outer ring drying roller.

5. A roller dryer according to claim 1, characterized in that: The drying disk (200) comprises: an upper plate (201), a lower plate (202), an inner vertical tube (203), an outer vertical tube (204) and a reinforcing column (205); the upper plate (201) and the lower plate (202) are buckled together to form a disk drying chamber, a plurality of reinforcing columns (205) are arranged between the drying chambers, the inner vertical tube (203) passes through the middle of the disk drying chamber to form the discharge port (104), the disk drying chamber has a disk drying medium inlet (206) on its circumference, and the outer vertical tube (204) is connected to the inside of the disk drying chamber and extends downward from the disk drying chamber to form a disk drying medium outlet.

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