CN110857834A - Double-layer heating disc type dryer - Google Patents

Abstract

The invention relates to a double-layer heating disc type dryer which comprises a drying bin, a variable speed motor, a bracket, a heating disc, a transmission shaft, a rake lever device and an air inlet and discharge device. The variable speed motor drives the transmission shaft to rotate, and the rake lever device and the transmission shaft rotate together. The harrow bar device comprises a fixing frame, a heating device, a harrow bar, harrow blades and a guide plate. The material on the heating plate has produced the displacement under the effect of stirring of the harrow leaf of harrow pole device and guide plate and has turned the shop, has improved the dry degree of consistency of material water content, and the effective heating area of the quotation of heating plate >85%, heating device's power cord passes through the brush and connects or electrically drives to connect and connect the power outside the connection drying storehouse, and the heat energy that heating device produced passes through on the material of thermal radiation conduction on the heating plate quotation. Materials on the surface of the heating plate are heated by the heating plate and the heating device in a heat conduction mode from top to bottom, so that the upper and lower heating intensity of the materials is increased, and the material drying speed is increased.

Description

Double-layer heating disc type dryer

Technical Field

The invention relates to a disc dryer, in particular to a double-layer heating disc dryer.

Background

Heating plates installed in a disc dryer on the market at present are multi-layered, materials are arranged on the heating plates, heating media (steam and hot water) in the heating plates transfer heat to the materials on the heating plates through the upper surfaces of the heating plates, and the materials absorb the heat energy on the heating plates to evaporate the water. The heating device is not arranged on the rake rod, so that the materials on the heating plate are only heated by single-side heat conduction of the heating plate, the material drying speed is slow, and the material drying effect is influenced.

When the disc dryer works, a plurality of rake blades arranged on the rake rod rotate along the disc surface of the heating disc under the driving of the rake rod, the front side of the disc dryer is provided with a material pushing rake blade to enable materials to move along the tangential direction and the vertical direction of the rake blades, the rear side of the disc dryer is provided with a limiting rake blade to control the spreading area of the materials, and the limiting rake blade is also the material pushing rake blade of the next material ring. Each rake blade only pushes the materials in front of the rake blade to be stacked into a material pile along the front face of the rake blade scraper according to the dynamic repose angle, the material pile is in an asymmetric slope shape, the covering area of the annular material pile is even smaller than the exposed area, the effective heating area of the heating plate is less than 50%, and the normal efficiency of the dryer is seriously influenced.

Disclosure of Invention

In order to solve the problem of overcoming the defects in the prior art, the double-layer heating disc type dryer is provided. A heating device and a guide plate are arranged on the harrow bar: the area of the annular material pile covered on the surface of the heating disc is more than 85 percent under the guiding and spreading action of the guide plates. The materials on the heating plate are heated by the heating plate and the heating plate in a heat conduction mode from top to bottom, the material drying speed is increased, and the material drying speed is improved.

The technical scheme adopted by the invention for solving the technical problems is as follows: a double-layer heating disc dryer comprises a drying bin, a variable speed motor, a support, a heating disc, a transmission shaft and a rake lever device.

The drying bin is fixed on the ground through a support.

The drying bin comprises a feeding hole, a discharging hole and an exhaust hole.

The double-layer heating disc type dryer can select a vacuum drying process or a convection drying process according to the drying quality requirement of the materials, so that the drying quality and speed of the materials are improved.

Firstly, mounting high-air-tightness type air-tight devices on a feeding hole and a discharging hole of a drying bin according to the implementation of a vacuum drying process by using a double-layer heating disc dryer, and feeding and discharging materials in high air tightness by using the high-air-tightness type air-tight devices; and a vacuum unit is arranged on the exhaust port to vacuumize.

The high-airtight type air-lock ensures that air outside the drying bin cannot leak into the drying bin through the high-airtight type air-lock in the feeding and discharging process of materials.

After the high-airtight type air-tight devices are arranged on the discharge port and the feed port of the drying bin, materials can continuously enter and exit the drying bin through the high-airtight type air-tight devices, and moisture generated by gasification during drying of the materials in the drying bin is pumped out of the drying bin through a vacuum unit arranged on an exhaust port of the drying bin; the material can carry out the vacuum drying of continuity, promotes the dry efficiency of material and optimizes the dry effect of material.

Secondly, when the convection drying process is carried out by the double-layer heating disc type dryer, an air-lock valve is arranged on a feeding hole of the drying bin for feeding; an air inlet and discharge device is arranged on a discharge port of the drying bin, and the discharge port or any discharge port is not opened. An exhaust fan is arranged on an exhaust port of the drying bin for exhausting, and the exhaust fan is an axial flow fan or a centrifugal fan.

1. The air inlet and discharge device comprises a three-way pipe, an air inlet fan, an air seal device and a discharge pipe. The three-way pipe is provided with an inlet, an air inlet and an outlet. The inlet of the three-way pipe is provided with a flange, and the air inlet and discharge device is fixed on the discharge hole of the drying bin through the flange on the three-way pipe. The air inlet fan is arranged at the air inlet of the three-way pipe and is an axial flow fan or a centrifugal fan. The air closing device is arranged at the outlet of the three-way pipe and used for highly airtight material discharge of materials at the discharge outlet of the drying bin, and the dried materials discharged by the air closing device are arranged on the conveying belt in a bundling manner through the material discharge pipe, so that the dried materials are conveyed in a centralized manner. The air lock ensures that air outside the drying bin can not leak into the drying bin through the air lock in the discharging process of the materials.

When the air inlet and discharge device is arranged on the discharge port of the drying bin, the temperature of air outside the drying bin is lower than that of the dried material. Cold air outside the drying bin is blown into the drying bin by the air inlet fan; the cold air enters the drying bin through a discharge hole of the drying bin.

The high temperature material after the cold air is to the drying of dry storehouse discharge gate department plays refrigerated usefulness, and the low temperature air becomes hot-air after having absorbed the high temperature on the material, and the hot-air after heating plays the effect of carrying the moisture that the material is gasification produced when dry in the dry storehouse, and the moisture that the exhaust fan on the dry storehouse discharge gate carried hot-air discharges dry storehouse.

2. When the air inlet and discharge device is not installed on the discharge port of the drying bin, the air outside the drying bin enters the drying bin through the discharge port of the drying bin; the exhaust fan on the exhaust port is an axial fan or a centrifugal fan. In cold air got into dry storehouse through the discharge gate in dry storehouse, cold air played refrigerated effect to the high temperature material after the drying of dry storehouse discharge gate department, became hot-air after the low temperature air has absorbed the high temperature on the material, the effect of the moisture that the gasification produced when heating up when playing the material drying in the dry storehouse, the dry storehouse of moisture discharge that the fan on the gas vent carried hot-air.

The heating plate of the double-layer heating tray dryer is made in the same structure as that of the heating plate of the conventional tray dryer.

The heating plate is a large heating plate and a small heating plate. The fixing and mounting method of the heating plate of the double-layer heating disc dryer and the heat supply of the heat-conducting medium are the same as those of the conventional disc dryer. The large heating plate and the small heating plate are fixed on a bin body in the drying bin by a support frame in sequence, and the small heating plate is arranged below the large heating plate. The heat conducting medium for supplying heat is water or heat conducting oil.

After the heat-conducting medium is heated by the heating equipment arranged outside, the heat-conducting medium carrying heat energy enters the heating plate through the heat energy inlet of the heating plate, the heat energy carried by the heat-conducting medium is transferred to the disk surface of the heating plate, and the heat energy carried by the heat-conducting medium carries out heat conduction and heating on the material on the disk surface of the heating plate. The heat-conducting medium after heat conduction is discharged out of the heating plate through a heat energy outlet of the heating plate and then is heated again through an external heating device; the heat-conducting medium is always circulated in the heating plate and the heating equipment for heat-conducting heating.

The external heating device is a boiler, a burner or a heat pump.

The transmission shaft penetrates through a bearing device arranged on the bin body in the lower end bin of the drying bin, the upper end of the transmission shaft enters the drying bin, and the transmission shaft penetrates through a middle hole of the heating plate. The bearing device supports and supports the transmission shaft, and the stability of the transmission shaft is guaranteed. The joint of the transmission shaft and the drying cabin body is fixedly sealed by a sealing device outside the cabin. The transmission shaft is dynamically sealed by the sealing device in the rotating process, and air outside the drying bin can not enter the drying bin through the connecting part of the transmission shaft and the drying bin body during vacuum drying of materials.

A plurality of groups of harrow bar devices are fixedly arranged on a transmission shaft in the drying bin, and one group of harrow bar devices corresponds to one heating plate.

The speed change motor is connected with the lower end of the transmission shaft, the transmission shaft is driven by the speed change motor to rotate, and the rake lever device and the transmission shaft rotate together.

The harrow bar device comprises a fixing frame, a heating device, a harrow bar, harrow blades and a guide plate.

The harrow blades are fixedly arranged below the harrow bar, and the connection mode of the harrow blades and the harrow bar is the same as that of a conventional disc dryer.

The heating device is connected and fixed with the rake rods on two adjacent sides into a whole through a fixing frame; the fixing frame is a metal strip, and the length of the fixing frame is 50-180 mm.

The appearance shape of the heating device is fan-shaped, the heating device is arranged on the harrow bar device, the heating device is a small end close to the inner side, and the heating device is a large end close to the outer side.

One end of a rake rod of the rake rod device is fixed on the transmission shaft, the small end of the heating device is fixed on the transmission shaft through the fixing frame, and the rake rod device and the transmission shaft are fixedly connected into a whole.

The guide plate comprises a guide plate and a pressing plate. The pressing plate is arranged on the material guide plate, and the pressing plate and the material guide plate are integrated. The material for making the guide plate and the pressure plate is a metal plate, and the guide plate is made by directly stamping a metal plate; the thickness of the metal plate is 0.5-3 mm.

The appearance of the said deflector is the shape, the shape is the reverse upward L shape angle iron.

The pressing plate presses materials which cannot move upwards and break through the material pile of the pressing plate, and the materials can only move towards two sides along the material guide plate. The material pile is guided and spread by the guide plate under the pressing action of the pressing plate, and the material of the material pile is spread on the disc surface of the heating disc.

The guide plate is fixed on a side plate of the heating device on the side, facing the material, of the heating device, or is fixed on a fixing frame between the heating device and the rake lever; the length of the lower end of the guide plate extending out of the lower end surface of the heating device is 10-45 mm.

The length of the guide plate is the same as that of the side plate of the heating device.

The guide plate pushes the material piles formed by the harrow leaves to be spread and cover the disc surface of the heating disc.

The lower ends of the harrow leaves of the harrow bar device are attached to the disc surface of the heating disc; the distance between the lower end of the guide plate and the disk surface of the heating disk is equal to the thickness of the material to be dried on the disk surface of the heating disk.

The distance between the lower end face of the heating device of the rake rod device and the surface of the material layer on the disc face of the heating disc is 8-50 mm, so that heat energy generated by the heating device is conveniently conducted on the material through heat radiation.

The upper end of transmission shaft install the electric wire tube, the lower extreme of transmission shaft and electric wire tube is fixed as an organic whole, the electric wire tube is along with the transmission shaft synchronous revolution together, heating device's power cord is worn in the pipe of the electric wire tube of transmission shaft upper end, heating device's power cord is along with transmission shaft and electric wire tube synchronous revolution together. The power cord of the heating device is connected with a power supply outside the drying bin through an electric brush joint or an electric drive joint.

After a power line of the heating device is electrified, heat energy generated by the heating device is conducted on materials on the surface of the heating plate through heat radiation.

The heating device is an electric heating plate or an infrared heating device.

The electric heating plate comprises a heating plate, a heat conducting working medium and an electric heating pipe; the heat conducting working medium and the electric heating pipe are arranged inside the heating plate. The heating plate is a hollow metal box made of metal plates.

The bottom plate and the top plate in the heating plate are connected and fixed by metal strips. The installation of the metal strips in the heating plate does not influence the flow of the heat-conducting working medium. The heating plate fixed by the metal strips ensures that the heating plate cannot deform in a protruding or sunken way due to high-pressure negative pressure in the drying bin. The heat conducting working medium is water or heat conducting oil.

The distance between the lower end face of the heating plate and the surface of the material layer on the disc face of the heating disc is 8-50 mm, so that heat energy generated by the heating plate is conveniently conducted on the material through heat radiation.

When the power line of the heating plate synchronously rotates along with the transmission shaft, the power supply outside the drying bin supplies power to the power line of the electric heating pipe in the electric heating plate through the electric brush joint or the electric driving joint.

After the electric wire of the electric heating pipe is electrified, the heat energy generated by the electric heating pipe is used for heating and conducting heat for the heat conducting working medium in the heating plate; the heat energy carried by the heat-conducting working medium in the electric heating plate is conducted on the material on the surface of the heating plate through heat radiation.

The infrared heating device comprises an infrared generator, a reflecting cover and a frame. The frame is a metal frame made of metal.

The reflector is arranged and fixed on the frame, and the infrared generator is arranged in the reflector of the reflector.

The infrared generator is characterized in that two ends of the infrared generator are fixed on the frame, or the infrared generator is fixed on the reflector; the power lines of the infrared generators are connected into a whole.

The heat insulation layer is arranged outside the reflecting cover for heat insulation, and the heat insulation layer reduces the loss of heat energy.

The infrared generator is a tungsten infrared bulb, or cast iron with a nichrome wire inside, or a ceramic hollow plate with a nichrome wire inside, or a silicon carbide plate-shaped heater.

The distance between the lower part of the infrared generator of the infrared heating device and the surface of the material layer on the disc surface of the heating disc is 8-50 mm, so that the heat energy generated by the infrared generator is conveniently conducted on the material through heat radiation.

When the power line on the infrared generator rotates synchronously along with the transmission shaft, the power supply outside the drying bin supplies power to the power line of the infrared generator through the electric brush joint or the electric drive joint. After the electric wire of the infrared generator is electrified, the heat energy generated by the infrared generator is conducted on the material on the surface of the heating plate through heat radiation.

The work flow of the material turning and paving of the harrow bar device is as follows:

the material heating device comprises a plurality of rake blades arranged on a rake rod, wherein the rake blades are driven by the rake rod to rotate along the disc surface of the heating disc, the material moves along the tangential direction and the vertical direction of the rake blades, a guide plate arranged on the heating device is arranged behind the rake blades, and the guide plate controls the spreading area of the material on the disc surface.

And secondly, the rake blades of the rake rod push the materials in front of the rake rod, and the pushed materials are gathered into an asymmetrical annular material pile along the side edges of the rake blades under the guiding and guiding effects of the rake blades.

Thirdly, materials are gathered at the side edge of the rake blade to form an asymmetric material pile and are paved through the diversion of the diversion plate, the materials lower than the space between the lower end of the diversion plate and the disc surface move through the lower end of the diversion plate, and the materials higher than the lower end of the diversion plate cannot move through the lower end of the diversion plate.

And fourthly, the materials higher than the lower end of the guide plate move towards the two sides of the guide plate under the guide flow guiding action of the guide plate, the materials higher than the lower end of the guide plate sequentially settle down in the process of moving towards the two sides, and the materials which settle down and are positioned in the space between the lower end of the guide plate and the disc surface move through the lower end of the guide plate.

Fifthly, the material of the annular material pile covers the disc surface of the heating disc under the guiding, guiding and spreading action of the guide plates, the effective heating area of the disc surface of the heating disc is larger than 85%, and the normal efficiency of the heating disc of the disc dryer is improved.

The material drying work flow of the double-layer heating disc type dryer is as follows:

firstly, conveying a material to be dried on a first layer of large heating disc at the upper part in a drying bin from a feeding hole of the drying bin, driving a transmission shaft to rotate by a variable speed motor, driving a rake rod device to do rotary motion by the transmission shaft, enabling the material to flow through the disc surface of the large heating disc along an exponential spiral line under the pushing action of rake blades, and enabling the material on the large heating disc to move inwards in a rotating way and fall onto a next layer of small heating disc from a middle hole in the middle; the material on the small heating plate is transferred to the outer edge of the small heating plate by the outward rotating stirring guide flow and falls to the outer edge of the large heating plate below the outer edge of the small heating plate; the large heating plates and the small heating plates are alternately arranged up and down, so that the materials can continuously flow through the drying bin of the whole disc type dryer in an internal rotation or external rotation mode.

And secondly, covering the materials on the disk surface of the heating disk under the guiding, guiding and spreading effects of the rake blades and the guide plates. The material has produced the displacement under the stirring water conservancy diversion effect of harrow leaf and guide plate and has turned the spreading, has improved the dry degree of consistency of material water content, and the effective heating area of the quotation of heating plate >85%, has improved the performance of the normal efficiency of disc dryer.

Thirdly, after the heat-conducting medium is heated by the heating equipment arranged outside, the heat-conducting medium carrying heat energy enters the heating plate through the heat energy inlet of the heating plate, the heat energy carried by the heat-conducting medium is transferred to the plate surface of the heating plate, and the heat energy carried by the heat-conducting medium in the heating plate conducts heat for the material on the plate surface of the heating plate.

And fourthly, after a power cord of the heating device on the rake rod device is electrified, heat energy generated by the heating device is conducted on the material on the surface of the heating plate through heat radiation. Materials on the surface of the heating plate are heated by the heating plate and the heating device in a heat conduction mode from top to bottom, so that the upper and lower heating intensity of the materials is increased, and the material drying speed is increased.

Fifthly, discharging moisture generated when the materials in the drying bin are dried through an air outlet of the drying bin; and the dried material on the lowest small heating plate in the drying bin is discharged out of the drying bin through a discharge hole of the drying bin.

Compared with the prior disc dryer, the invention has the following beneficial effects: a double-layer heating disc dryer is characterized in that a transmission shaft is fixedly provided with a plurality of groups of rake rod devices; the harrow bar device comprises a fixing frame, a heating device, a harrow bar, harrow blades and a guide plate. The material on the heating plate produces the displacement and turns over the spreading under the stirring water conservancy diversion effect of the harrow leaf of harrow pole device and guide plate, has improved the dry degree of consistency of material water content, and the effective heating area of the quotation of heating plate > 85%. The power cord of the heating device is connected with a power supply outside the drying bin through an electric brush joint or an electric drive joint, and heat energy generated by the heating device is conducted on materials on the disc surface of the heating disc through heat radiation. Materials on the surface of the heating plate are heated by the heating plate and the heating device in a heat conduction mode from top to bottom, so that the upper and lower heating intensity of the materials is increased, and the material drying speed is increased.

Drawings

FIG. 1 is a schematic diagram of the construction of a dual-layer heated tray dryer of the present invention;

fig. 2 is a schematic view of the connection of the rake lever unit and the drive shaft of the double-deck heated tray dryer of the present invention;

fig. 3 is a schematic view of the construction of the rake lever assembly of the double-deck heated tray dryer of the present invention;

fig. 4 is a schematic view of the construction of an electric heating plate of a raking arm unit of the double-heated tray dryer of the present invention;

FIG. 5 is a schematic view of the structure of the infrared heating means of the rake lever means of the double-deck heated tray dryer of the present invention;

fig. 6 is a schematic view of the structure of the deflector of the raker arm assembly of the double-deck heated tray dryer of the present invention;

FIG. 7 is a schematic diagram of a dual-layer heated tray dryer in the convection drying process of the present invention;

fig. 8 is a schematic structural view of an intake and discharge device of a double-layer heated tray dryer according to the present invention.

In the figure: 1. the device comprises a drying bin, 2, a variable speed motor, 3, a transmission shaft, 4, a support, 5, a rake rod device, 6, an exhaust port, 7, a fixing frame, 8, a heating device, 9, a feed inlet, 10, a discharge port, 11, a large heating disc, 12, a small heating disc, 13, a rake rod, 14, a guide plate, 15, material thickness, 16, rake blades, 17, an electric heating pipe, 18, a heat conducting working medium, 19, an electric heating plate, 20, an infrared generator, 21, a reflecting cover, 22, an infrared heating device, 23, a disc surface, 24, a material pile, 25, an electric wire pipe, 26, a frame, 27, a pressing plate, 28, a lower end surface, 29, a material guide plate, 30, a lower end, 31, an air inlet fan, 32, a flange, 33, a three-way pipe, 34, an air lock, 35, a discharge pipe, 36 and an air.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

example 1:

referring to fig. 1, 2 and 3, the double-layer heating disc dryer comprises a drying bin 1, a variable speed motor 2, a bracket 4, a heating disc, a transmission shaft 3 and a harrow bar device 5.

The drying bin 1 is fixed on the ground through a support 4.

The drying bin 1 comprises a feeding hole 9, a discharging hole 10 and an exhaust port 6.

When the double-layer heating disc dryer performs a vacuum drying process, high-air-tightness air-tight devices are arranged on a feeding hole 9 and a discharging hole 10 of the drying bin 1 and used for feeding and discharging materials in a high-air-tightness manner, and a vacuum unit is arranged on an exhaust port 6 for vacuumizing and exhausting.

After the high-airtight type air-tight device is arranged on the discharge port 10 and the feed port 9 of the drying bin 1, the materials can continuously enter and exit the drying bin 1 through the high-airtight type air-tight device, and moisture generated by gasification during drying of the materials in the drying bin 1 is pumped out of the drying bin 1 by a vacuum unit arranged on an exhaust port 6 of the drying bin 1; the material can carry out the vacuum drying of continuity, promotes the dry efficiency of material and optimizes the dry effect of material.

The heating plate is a large heating plate 11 and a small heating plate 12; the large heating plate 11 and the small heating plate 12 are fixed on the bin body in the drying bin 1 by a support frame in sequence, and the small heating plate 12 is arranged below the large heating plate 11.

The transmission shaft 3 penetrates through a bearing device arranged on a bin body in a bin at the lower end of the drying bin 1, the upper end of the transmission shaft 3 enters the drying bin 1, and the transmission shaft 3 penetrates through a middle hole of the heating plate. The bearing device supports and supports the transmission shaft 3, and the stability of the transmission shaft 3 is guaranteed.

The joint of the transmission shaft 3 and the drying bin 1 is fixedly sealed by a sealing device outside the bin.

The transmission shaft 3 is dynamically sealed by a sealing device in the rotating process, and air outside the drying bin 1 can not enter the drying bin 1 through the connecting part of the transmission shaft 3 and the bin body of the drying bin 1 during vacuum drying of materials.

A plurality of groups of harrow bar devices 5 are fixedly arranged on the transmission shaft 3 in the drying bin 1, and one group of harrow bar devices 5 corresponds to one heating plate.

The variable speed motor 2 is connected with the lower end of the transmission shaft 3, the variable speed motor 2 drives the transmission shaft 3 to rotate, and the rake lever device 5 and the transmission shaft 3 rotate together.

As shown in fig. 2 and 3, the rake lever device 5 comprises a fixed frame 7, a heating device 8, a rake lever 13, rake blades 16 and a guide plate 14.

The blades 16 are fixedly arranged below the rake bar 13, and the connecting mode of the blades 16 and the rake bar 13 is the same as that of the conventional disc dryer.

The heating device 8 is connected and fixed with the harrow bars 13 at two adjacent sides into a whole through the fixed frame 7.

The length of the fixing frame 7 is 80 mm.

The heating device 8 is fan-shaped, and the heating device 8 is arranged on the harrow bar device 5 and is a small end close to the inner part and a large end close to the outer part.

One end of a harrow bar 13 of the harrow bar device 5 is fixed on the transmission shaft 3, the small end of the heating device 8 is fixed on the transmission shaft 3 through a fixing frame 7, and the harrow bar device 5 and the transmission shaft 3 are fixedly connected into a whole.

The guide plate 14 comprises a guide plate 29 and a pressing plate 27. The pressing plate 27 is provided above the material guide plate 29, and the pressing plate 27 and the material guide plate 29 are integrated.

The appearance of the baffle 14 is a "shape".

The pressing plate 27 presses materials and cannot move upwards, the material pile 24 is guided and paved by the material guide plate 29 under the pressing action of the pressing plate 27, and the materials of the material pile 24 are paved on the disk surface 23 of the heating disk.

The guide plate 14 is fixed on a side plate of the heating device 8 facing the material side of the heating device 8; the length of the lower end 30 of the guide plate 29 of the guide plate 14 extending beyond the lower end surface 28 of the heating device 8 is 20 mm.

The length of the guide plate 14 is the same as that of the side plate of the heating device 8.

The deflector 14 spreads the material pile 24 pushed by the rake blades 16 to cover the disc surface 23 of the heating disc.

The lower end of the rake blade 16 is attached to the disk surface 23 of the heating disk; the distance between the lower end 30 of the guide plate 14 and the disk surface 23 of the heating disk is equal to the thickness 15 of the material to be dried on the disk surface 23 of the heating disk.

The distance between the lower end surface 28 of the heating device 8 of the rake lever device 5 and the surface of the material layer on the disc surface 23 of the heating disc is 18mm, so that the heat energy generated by the heating device 8 is conveniently conducted on the material through heat radiation.

The upper end of the transmission shaft 3 is provided with a wire tube 25, the transmission shaft 3 and the lower end of the wire tube 25 are fixed into a whole, and the wire tube 25 rotates synchronously with the transmission shaft 3.

The power cord of the heating device 8 is threaded in the tube of the electric wire tube 25 at the upper end of the transmission shaft 3, and the power cord of the heating device 8 synchronously rotates along with the transmission shaft 3 and the electric wire tube 25; the power cord of the heating device 8 is connected with the power supply outside the drying cabin 1 through the brush joint.

After the power cord of the heating device 8 is electrified, the heat energy generated by the heating device 8 is conducted on the material on the heating plate surface 23 through heat radiation.

The heating means 8 shown in fig. 1, 2, 3, 4 is an electrical heating plate 19, as shown in fig. 1, 2, 3.

The electric heating plate 19 comprises a heating plate, a heat conducting working medium 18 and an electric heating pipe 17; a heat conducting working medium 18 and an electric heating tube 17 are mounted inside the heating plate.

The bottom plate and the top plate of the heating plate are fixedly connected through metal strips. The mounting of the metal strips in the heating plate does not affect the flow of the heat-conducting working medium 18.

The heating plate fixed by the metal strips ensures that the heating plate does not deform convexly or concavely due to the high-pressure negative pressure inside the drying bin 1. The heat conducting working substance 18 is a heat conducting oil.

The distance between the lower end surface 28 of the heating plate and the surface of the material layer on the plate surface 23 of the heating plate is 18mm, so that the heat energy generated by the heating plate is conveniently conducted on the material through heat radiation.

When the power line of the heating plate synchronously rotates along with the transmission shaft 3, the power supply outside the drying bin 1 supplies power to the power line of the electric heating pipe 17 in the electric heating plate 19 through the electric driving joint.

After the electric wire of the electric heating pipe 17 is electrified, the heat energy generated by the electric heating pipe 17 heats the heat conducting working medium in the heating plate for heat conduction; the heat energy carried by the heat conducting working medium in the electric heating plate 19 is conducted on the material on the heating plate surface 23 through heat radiation.

The work flow of the material turning and spreading of the rake lever device 5 is as follows:

the material heating device comprises a plurality of rake blades 16 arranged on a rake rod 13, wherein the rake blades 16 are driven by the rake rod 13 to rotate along the disk surface 23 of the heating disk, the material moves along the tangential direction and the vertical direction of the rake blades 16, a guide plate 14 arranged on the heating device 8 is arranged behind the rake blades 16, and the guide plate 14 controls the paving area of the material on the disk surface 23.

Secondly, the rake blade 16 of the rake rod 13 pushes the material ahead of the rake rod, and the pushed material is gathered into an asymmetrical annular material pile 24 along the side edge of the rake blade 16 under the guiding and guiding action of the rake blade 16.

Thirdly, the materials are gathered at the side edge of the rake blades 16 to form an asymmetric material pile 24 which is spread by the diversion of the diversion plate 14, the materials lower than the space between the lower end 30 of the diversion plate 14 and the disc surface 23 move through the lower end 30 of the diversion plate 14, and the materials higher than the lower end 30 of the diversion plate 14 cannot move through the lower end 30 of the diversion plate 14.

And fourthly, under the guiding and guiding action of the guide plate 14, the materials higher than the lower end 30 of the guide plate 14 move to the two sides of the guide plate 14, the materials higher than the lower end 30 of the guide plate 14 settle down in sequence in the process of moving to the two sides, and the materials which settle down and are positioned in the space between the lower end 30 of the guide plate 14 and the plate surface 23 move through the lower surface of the lower end 30 of the guide plate 14.

Fifthly, the material of the material pile 24 covers the disc surface 23 of the heating disc under the guiding, guiding and spreading action of the guide plate 14, the effective heating area of the disc surface 23 of the heating disc is larger than 85%, and the normal efficiency of the heating disc of the disc dryer is improved.

The material drying work flow of the double-layer heating disc type dryer is as follows:

firstly, materials to be dried are conveyed on a first layer of large heating disc 11 at the upper part in a drying bin 1 from a feeding hole 9 of the drying bin 1, a variable speed motor 2 drives a transmission shaft 3 to rotate, the transmission shaft 3 drives a rake lever device 5 to do rotary motion, the materials flow through a disc surface 23 of the large heating disc 11 along an exponential spiral line under the pushing action of rake blades 16, the materials on the large heating disc 11 inwardly and spirally move and fall onto a next layer of small heating disc 12 from a middle hole in the middle; the material on the small heating plate 12 is transferred to the outer edge of the small heating plate 12 by the outward turning stirring guide flow and falls to the outer edge of the large heating plate 11 below the outer edge of the small heating plate 12; the large heating plates 11 and the small heating plates 12 are alternately arranged up and down, and the materials can continuously flow through the drying bin 1 of the whole disc type dryer by internal rotation or external rotation.

Secondly, the material on the disk surface 23 of the heating disk covers the disk surface 23 of the heating disk under the guiding and spreading action of the rake blades 16 and the guide plate 14. The material has produced the displacement under the stirring water conservancy diversion effect of harrow leaf 16 and guide plate 14 and has turned the spreading, has improved the dry degree of consistency of material water content, and the effective heating area of the quotation 23 of heating plate >85%, has improved the performance of the normal efficiency of heating plate.

Thirdly, after the heat-conducting medium is heated by the heating equipment arranged outside, the heat-conducting medium carrying heat energy enters the heating plate through the heat energy inlet of the heating plate, the heat energy carried by the heat-conducting medium is transferred to the plate surface 23 of the heating plate, and the heat energy carried by the heat-conducting medium in the heating plate conducts heat for the material on the plate surface 23 of the heating plate.

Fourthly, after the power cord of the electric heating plate 19 is electrified, the heat energy generated by the electric heating plate 19 is conducted on the material on the heating plate panel 23 through heat radiation.

Fifthly, materials on the surface 23 of the heating plate are heated by the heating plate and the electric heating plate 19 in a heat conduction mode, so that the up-down heating intensity of the materials is increased, and the drying speed of the materials is increased.

Sixthly, discharging moisture generated when the materials in the drying bin 1 are dried through an air outlet 6 of the drying bin 1; the dried material on the lowest heating plate 12 in the drying bin 1 is discharged out of the drying bin 1 through a discharge hole 10 of the drying bin 1.

Example 2:

referring to fig. 1, 2, 3, 5 and 7, the double-layer heating disc dryer comprises a drying bin 1, a variable speed motor 2, a bracket 4, a heating disc, a transmission shaft 3, a rake lever device 5 and an air inlet and discharge device 36.

The double-deck heated tray dryer of embodiment 2 shown in fig. 1, 2, and 7 has the same structure as the double-deck heated tray dryer described in embodiment 1, and thus, description thereof will not be repeated.

The drying bin 1 comprises a feeding hole 9, a discharging hole 10 and an exhaust port 6.

The inlet and outlet device 36 shown in fig. 8 comprises a tee 33, an inlet fan 31, an airlock 34 and a discharge pipe 35.

The three-way pipe 33 is provided with an inlet, an air inlet and an outlet.

The inlet of the three-way pipe 33 is provided with a flange 32, and the air inlet and discharge device 36 is fixed on the discharge hole 10 of the drying bin 1 through the flange 32 on the three-way pipe 33.

The air inlet fan 31 is arranged at the air inlet of the three-way pipe 33, and the air inlet fan 31 is a centrifugal fan.

The air lock 34 is installed on the outlet of the three-way pipe 33, and the air lock 34 is used for discharging the materials at the outlet of the drying bin in a highly airtight manner.

The dried materials discharged by the air-lock valve 34 are arranged on the conveying belt by a discharge pipe 35 in a cluster mode, so that the dried materials can be conveyed in a centralized mode.

The air lock 34 ensures that air outside the drying bin 1 cannot leak into the drying bin 1 through the air lock 34 in the discharging process of the materials.

As shown in fig. 7, the double-heated tray dryer shown in fig. 8 is installed with an airlock on the feed port 9 of the drying silo 1 for feeding when the convection drying process is performed.

The air inlet and discharge device 36 is installed on the discharge port 10 of the drying bin 1.

And an exhaust fan is arranged on the exhaust port 6 for exhausting, and the exhaust fan is an axial flow fan.

When the air inlet and discharge device 36 is arranged on the discharge port of the drying bin 1, cold air outside the drying bin 1 is blown and pressed by the air inlet fan 31 to enter the drying bin 1; the cold air enters the drying bin 1 through the discharge hole 10 of the drying bin 1.

The cold air plays the refrigerated effect to the high temperature material after the drying of discharge gate 10 department in dry storehouse 1, becomes hot-air after the low temperature air has absorbed the high temperature on the material, and the hot-air after heating plays the effect of carrying the moisture that the material gasification produced when dry in dry storehouse 1, and the exhaust fan on dry storehouse 1 gas vent 6 discharges dry storehouse 1 with the moisture that hot-air carried.

As shown in fig. 1, 2, 3, 5 and 7, the heating device 8 is an infrared heating device 22.

The guide plate 14 is fixed on the fixing frame 7 between the heating device 8 and the harrow bar 13.

The infrared heating device 22 comprises an infrared generator 20, a reflector 21 and a frame 26.

The frame 26 is a metal frame made of metal.

The reflectors 21 are arranged and fixed on the frame 26.

The infrared generator 20 is mounted in the housing of a reflector 21.

The infrared generator 20 is fixed on the reflector 21, and the power lines of the infrared generators 20 are connected into a whole.

The reflecting shade 21 is externally provided with a heat insulation layer for heat insulation.

The infrared generator 20 is a tungsten infrared bulb.

The distance between the lower part of the infrared generator 20 of the infrared heating device 22 and the surface of the material layer on the plate surface 23 of the heating plate is 15mm, so that the heat energy generated by the infrared generator 20 is conveniently conducted on the material through heat radiation.

When the power line on the infrared generator 20 rotates synchronously with the transmission shaft 3, the power supply outside the drying bin 1 supplies power to the power line of the infrared generator 20 through the electric brush joint or the electric drive joint.

After the electric wire of the infrared generator 20 is electrified, the heat energy generated by the infrared generator 20 is conducted on the material on the heating plate surface 23 through heat radiation.

The above embodiments are only used to help understand the manufacturing method and the core concept of the present invention, and the specific implementation is not limited to the above specific embodiments, and those skilled in the art can make changes without creative efforts from the above concepts, which all fall within the protection scope of the present invention.

Claims (6)

1. A double-layer heating disc type dryer comprises a drying bin (1), a variable speed motor (2), a bracket (4), a heating disc, a transmission shaft (3), a rake lever device (5) and an air inlet and discharge device (36); the method is characterized in that: the double-layer heating disc type dryer can select a vacuum drying process or a convection drying process according to the requirement of the drying quality of the materials;

the drying bin (1) is fixed on the ground through a support (4);

the drying bin (1) comprises a feeding hole (9), a discharging hole (10) and an exhaust hole (6);

the heating plates are a large heating plate (11) and a small heating plate (12), and the large heating plate (11) and the small heating plate (12) are sequentially fixed on a bin body in the drying bin (1) through a supporting frame;

the harrow bar device (5) comprises a fixed frame (7), a heating device (8), a harrow bar (13), harrow blades (16) and a guide plate (14); the harrow blades (16) are fixedly arranged below the harrow rods (13), and the heating device (8) is connected and fixed with the harrow rods (13) at two adjacent sides into a whole through the fixing frame (7);

the guide plate (14) comprises a guide plate (29) and a pressing plate (27); the pressing plate (27) and the material guide plate (29) are integrated;

the guide plate (14) is fixed on a side plate of the heating device (8) at one side of the heating device (8) facing the material, and the guide plate (14) or the fixed frame (7) between the heating device (8) and the rake lever (13);

the length of the lower end (30) of the guide plate (14) extending out of the lower end surface (28) of the heating device (8) of the guide plate (29) is 10-45 mm; the material pile (24) is guided and paved by a material guide plate (29) under the pressing action of a pressing plate (27);

one end of a harrow bar (13) of the harrow bar device (5) is fixed on the transmission shaft (3), the small end of the heating device (8) is fixed on the transmission shaft (3) through a fixing frame (7), and the harrow bar device (5) and the transmission shaft (3) are fixedly connected into a whole;

the lower end of the rake blade (16) is attached to the disc surface (23) of the heating disc, and the distance between the lower end (30) of the guide plate (14) and the disc surface (23) of the heating disc is equal to the thickness (15) of the material to be dried on the disc surface (23) of the heating disc;

the upper end of the transmission shaft (3) is provided with a wire tube (25);

the power cord of the heating device (8) is penetrated in the tube of the electric wire tube (25) at the upper end of the transmission shaft (3), the power cord of the heating device (8) synchronously rotates along with the transmission shaft (3) and the electric wire tube (25), and the power cord of the heating device (8) is connected with a power supply outside the drying bin (1) through an electric brush joint or an electric drive joint;

the variable speed motor (2) is connected with the lower end of the transmission shaft (3), and the transmission shaft (3) is driven by the variable speed motor (2) to rotate; the harrow bar device (5) and the transmission shaft (3) rotate together, the materials are displaced, stirred and paved under the stirring and flow guiding effects of harrow blades (16) and a flow guide plate (14) of the harrow bar device (5),

the heating device (8) is an electric heating plate (19) or an infrared heating device (22);

the air inlet and discharge device (36) comprises a three-way pipe (33), an air inlet fan (31), an air lock (34) and a discharge pipe (35);

heat-conducting media carrying heat energy enter the heating plate through a heat energy inlet of the heating plate, and the heat energy carried by the heat-conducting media in the heating plate conducts heat on materials on a plate surface (23) of the heating plate; after a power line of the heating device (8) is electrified, heat energy generated by the heating device (8) is conducted on the material on the heating plate disc surface (23) through heat radiation, and the material on the heating plate disc surface (23) is heated by the heating plate and the heating device (8) in a heat conduction mode from top to bottom.

2. A dual-deck heated tray dryer as set forth in claim 1, wherein: the length of the fixing frame (7) is 50-180 mm.

3. A dual-deck heated tray dryer as set forth in claim 1, wherein: the appearance shape of the heating device (8) is a sector, the heating device (8) is arranged on the harrow bar device (5) and is close to the inner small end and the outer large end.

4. A dual-deck heated tray dryer as set forth in claim 1, wherein: the distance between the lower end surface (28) of the heating device (8) and the surface of the material layer on the plate surface (23) of the heating plate is 8-50 mm.

5. A dual-deck heated tray dryer as set forth in claim 1, wherein: the electric heating plate (19) comprises a heating plate, a heat conducting working medium (18) and an electric heating pipe (17); the heat conducting working medium (18) and the electric heating pipe (17) are arranged inside the heating plate; after the electric wire of the electric heating pipe (17) is electrified, the heat energy generated by the electric heating pipe (17) heats the heat conducting working medium (18) in the heating plate for heat conduction; heat energy carried by a heat conducting working medium (18) in the electric heating plate (19) is conducted on the material on the surface (23) of the heating plate through heat radiation.

6. A dual-deck heated tray dryer as set forth in claim 1, wherein: the infrared heating device (22) comprises an infrared generator (20), a reflector (21) and a frame (26); the reflectors (21) are arranged and fixed on the frame (26), and the infrared generator (20) is arranged in the reflectors (21); after the electric wire of the infrared generator (20) is electrified, the heat energy generated by the infrared generator (20) is conducted on the material on the surface (23) of the heating plate through heat radiation.

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