Energy-saving mineral powder drying machine

Abstract

The invention relates to the technical field of mineral powder drying, and particularly discloses an energy-saving mineral powder drying machine which comprises a bottom bin and a vertical cylinder which are vertically communicated, an inner cylinder extending into the bottom bin is concentrically fixed in the vertical cylinder, a hollow rotating shaft is concentrically and rotatably arranged in the inner cylinder, and the upper end and the lower end of the hollow rotating shaft penetrate through the vertical cylinder and the bottom bin correspondingly; the lower end, extending out of the bottom bin, of the hollow rotating shaft is connected with a lifting motor, the hollow rotating shaft located in the inner barrel is provided with a lifting auger blade extending to the lower end of the bottom bin, the end of the hollow rotating shaft is connected with a hot air supply assembly, and the upper end of the vertical barrel is connected with a negative pressure air exhaust assembly; the mineral powder drying machine disclosed by the invention adopts a vertical design, so that the occupied area of the whole drying machine can be effectively reduced, meanwhile, the whole drying machine not only realizes quick drying of mineral powder, but also realizes full utilization of heat in hot air, reduces heat energy loss in the mineral powder drying process, and has the effects of energy conservation and emission reduction.

Description

Technical Field

[0001] The present invention relates to the technical field of ore powder drying, and specifically discloses an energy-saving ore powder dryer. Background Art

[0002] During the preparation of ore powder, it is necessary to dry it to improve the fluidity, dispersibility and stability of the ore powder and avoid caking. The existing equipment for ore powder drying mainly uses a drum dryer. During operation, the ore powder and hot air are introduced from the same end of the drum. During the rotation of the drum, the material is lifted and then scattered by the lifting plates on its inner wall, and then the introduced hot air is used to make it fully contact with the ore powder to complete drying.

[0003] For example, the utility model patent with the application number 202022348794.4 discloses an energy-saving phosphate ore powder drying device, including a base, a feeding mechanism, a discharging mechanism, a drum mechanism and a driving mechanism. The drum mechanism includes a drum, a front end cover and a rear end cover. A hot air pipe is installed on the front end cover, and an exhaust pipe is arranged on the rear end cover; the feeding mechanism includes a feeding cylinder and a feeding hopper. A feeding shaft is installed in the feeding cylinder, and spiral cutters are arranged on the feeding shaft. A first motor is installed at the end of the feeding cylinder, and the first motor is in transmission connection with the feeding shaft; the discharging mechanism includes a discharging pipe and a blockage; the driving mechanism includes an external gear ring, a driving gear, a second motor and a supporting component. The external gear ring is fixedly installed in the middle of the outer wall of the drum, and the driving gear is installed on the output shaft of the second motor and meshes with the external gear ring. The energy-saving phosphate ore powder drying device disclosed in this patent is a common type of drum dryer on the market. The ore powder and hot air are introduced from the same end of the drum, and the material is scattered by the lifting plates to make it fully contact with the hot air to complete the rapid drying of the material. However, the drum dryer has some deficiencies when used for ore powder drying: Firstly, the drum dryer not only occupies a large area, but also has serious dust emission during operation; Secondly, the hot air introduced from the bottom of the drum end face will gather at the top of the drum, resulting in only the material scattered in the front section being able to contact the hot air, while the hot air in the rear section gathers at the top, making the scattered material unable to fully contact the hot air, resulting in the ineffective utilization of the heat in the hot air and the unobvious energy-saving effect. Therefore, in view of the technical problems and deficiencies existing in the existing drum dryer during the ore powder drying process, this application proposes a vertical energy-saving ore powder dryer that can solve the above technical problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a vertical energy-saving ore powder dryer to solve the problems of large floor area, serious dust emission and poor energy-saving effect existing in the existing drum dryer during the drying process of ore powder.

[0005] The present invention is realized through the following technical solutions: An energy-saving ore powder dryer, comprising a bottom bin and a vertical cylinder that are connected up and down. An inner cylinder extending into the bottom bin is fixedly arranged concentrically in the vertical cylinder, and a hollow rotating shaft is rotatably arranged concentrically in the inner cylinder. The upper and lower ends of the hollow rotating shaft respectively penetrate through the vertical cylinder and the bottom bin, and a lifting motor is connected to the lower end of the hollow rotating shaft extending out of the bottom bin. A lifting auger blade extending to the lower end of the bottom bin is arranged on the hollow rotating shaft located in the inner cylinder. A feeding device is arranged at the side end of the bottom bin, and a discharging part is arranged at the lower end of the bottom bin.

[0006] The end of the hollow rotating shaft is connected with a hot air supply component, and the upper end of the vertical cylinder is connected with a negative pressure air extraction component. The hot air supply component includes a hot air source, a hot air pipe is connected to the hot air source, and the end of the hot air pipe is hermetically and rotatably connected to the bottom end of the hollow rotating shaft. The top end of the hollow rotating shaft is hermetically and rotatably connected with a guide air pipe, and the lower end of the guide air pipe is connected with a air distribution ring arranged closely against the outer surface of the lower end of the inner cylinder.

[0007] As a further setting of the above solution, a swirl adjustment mechanism is arranged in the swirl annular channel between the vertical cylinder and the inner cylinder above the air distribution ring. The swirl adjustment mechanism includes a plurality of sector plates arranged in an annular array in the swirl annular channel. A shaft rod along the radial direction is arranged at the middle position of the sector plate, and the two ends of the shaft rod are respectively rotatably connected with circular holes on the vertical cylinder and the inner cylinder. A transmission mechanism for driving all the shaft rods to rotate synchronously is arranged on the outer circular surface of the vertical cylinder.

[0008] As a further setting of the above solution, the transmission mechanism includes a slotted hole ring rotatably arranged on the outer circular surface of the vertical cylinder. Oblique slotted holes corresponding to each shaft rod are uniformly arranged on the slotted hole ring. An end strip is connected to the outer end of the shaft rod, and a convex column or a roller acting on the oblique slotted hole is fixedly connected to the end strip.

[0009] As a further setting of the above solution, a slide rail ring is arranged on the outer circular surface of the vertical cylinder. The slotted hole ring is rotationally installed in a limited way on the slide rail ring, and a toothed ring is arranged on the slotted hole ring. A power motor is fixedly installed on the vertical cylinder, and a gear meshing with the toothed ring is arranged on the power motor.

[0010] As a further setting of the above solution, a guide material inclined ring is arranged at the top of the inner cylinder. The upper end of the air distribution ring is provided with an inclined downward and protruding guide material ring surface. A plurality of air outlet holes are circumferentially and uniformly arranged on the air distribution ring below the guide material ring surface.

[0011] As a further setting of the above solution, the negative pressure air extraction component includes a negative pressure pipe connected to the upper end of the vertical cylinder. The lower end of the negative pressure pipe is connected with a dehumidification and filtration box, and a negative pressure fan is connected to the dehumidification and filtration box.

[0012] As a further setting of the above solution, the feeding device includes a feeding cylinder communicated with the bottom bin. The upper surface of the outer end of the feeding cylinder is connected with a feeding hopper. An upper feeding auger shaft is arranged inside the feeding cylinder, and the end of the upper feeding auger shaft is connected with an upper feeding motor.

[0013] As a further setting of the above solution, it further includes a base. The bottom bin is in the shape of a frustum of a cone with a wider upper part and a narrower lower part and is installed on the base.

[0014] During the operation of the vertical energy-saving ore powder dryer disclosed in the present invention, the hot air first enters from the bottom of the hollow rotating shaft, then flows upward along the hollow rotating shaft, and is then conveyed to the air distribution ring by the air guide pipe, so that it is evenly discharged from the periphery of the air distribution ring, and then spirally rises upward along the swirl annular passage between the vertical cylinder and the inner cylinder. The ore powder is lifted upward along the inner cylinder from the bottom bin by the lifting auger blade, and heat exchange is carried out with the hot air flowing through the hollow rotating shaft during the upward lifting process, so that its own temperature is preheated and increased. When the ore powder is lifted to the top of the inner cylinder, it is scattered from all around, and the ore powder will encounter the spirally rising hot air throughout the falling process, so that the hot air and the ore powder are in full thermal contact, enabling the moisture of the ore powder to evaporate and be extracted by the negative pressure air extraction component together with the hot air flow. After extraction, it is filtered, intercepted and dried, avoiding the dust emission during the ore powder drying process, and at the same time enabling the hot air to be in full contact with the ore powder, improving the drying effect of the ore powder.

[0015] In addition, at the initial stage of feeding, the lower end of the swirl passage can be blocked by the swirl adjustment mechanism, and then opened after a large amount of ore powder is loaded inside. The opened swirl adjustment mechanism makes the ore powder fall into the bottom bin. Then, when a large batch of ore powder is dried, the inclination angle of the fan-shaped plate relative to the horizontal plane can also be adjusted to change the pitch of the above spiral air flow, so that the movement time of the hot air along the swirl passage can be adjusted, ensuring that the ore powder can be in full contact with the hot air to complete the drying operation.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The ore powder dryer disclosed in the present invention adopts a vertical design, which can effectively reduce the floor area of the entire dryer; during the operation of ore powder drying, the ore powder can carry out heat exchange with the hot air flowing through the hollow rotating shaft when it is lifted upward to realize its own preheating and temperature increase, and then the falling ore powder will encounter the hot air discharged from the air distribution pipe and flowing upward throughout the falling process along the swirl passage, enabling the falling ore powder to be in full contact with the rising hot air, realizing the rapid drying of the ore powder, and realizing the full utilization of the heat in the hot air, reducing the heat energy loss during the ore powder drying process, and having the effect of energy conservation and emission reduction.

[0017] In the ore powder dryer of the present invention, through the design of the swirl adjustment mechanism, the spiral state of the hot air flowing upward can be adjusted, thereby adjusting the contact time between the hot air rising spirally and the ore powder, ensuring that the ore powder can be effectively dried during the drying process of the ore powder, guaranteeing its drying effect while reducing the energy consumption of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is a schematic perspective view of the first angle of the present invention; Figure 2 is a schematic perspective view of the second angle of the present invention; Figure 3 is a schematic internal plan view of the bottom bin, vertical cylinder, inner cylinder, etc. of the present invention; Figure 4 is a schematic internal perspective view of the bottom bin, vertical cylinder, inner cylinder, etc. of the present invention; Figure 5 is a schematic partial perspective view of the hot air supply assembly of the present invention; Figure 6 is a schematic perspective view of the swirl adjustment mechanism of the present invention; Figure 7 For the present invention Figure 4 is an enlarged schematic view of part A in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to enable those skilled in the art to better understand the solutions of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0021] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will refer to the attached Figures 1 - 7 drawings and describe the present application in detail in combination with the embodiments. Embodiment 1

[0022] Embodiment 1 discloses an energy-saving ore powder dryer. Refer to the attached Figures 1 - 4, including a bottom bin 1, a vertical cylinder 2, an inner cylinder 3, a feeding device 4, a hot air supply component 5, and a negative pressure air extraction component 6. The bottom bin 1 is in the shape of a frustum of a cone with a wider top and a narrower bottom, and is stably supported on the ground by a base 7. The feeding device 4 is connected to one side of the upper end of the bottom bin 1, and a discharge part 101 is provided at the lower end of the bottom bin 1. A corresponding gate valve (not shown in the figure) can be provided at the position where the discharge part 101 communicates with the bottom bin 1 to achieve the on-off control between the two.

[0023] Specifically, the feeding device 4 includes a feeding cylinder 401 connected to the side of the bottom bin 1. A feeding hopper 402 is connected to the upper surface of the outer end of the feeding cylinder 401. A feeding auger leaf shaft 403 is arranged inside the feeding cylinder 401, and a feeding motor 404 connected to the feeding auger leaf shaft 403 is provided at the outer end of the feeding cylinder 401. Under the spiral propulsion of the feeding auger leaf shaft 403, the mineral powder to be processed in the feeding hopper 402 can be quantitatively fed into the bottom bin 1.

[0024] The vertical cylinder 2 is vertically and fixedly connected to the upper end of the bottom bin 1, and the negative pressure air extraction component 6 is connected to the upper side of the vertical cylinder 2. Specifically, the negative pressure air extraction component 6 includes a negative pressure pipe 601 connected to the vertical cylinder 2. The lower end of the negative pressure pipe 601 is connected to a dehumidification and filtration box 602, and then a negative pressure fan 603 is connected to the other end of the dehumidification and filtration box 602. Under the action of the negative pressure fan 603, the floating hot and humid air can be pumped into the dehumidification and filtration box 602, and is discharged after being processed by the dehumidification module and the filtration module in the dehumidification and filtration box 602 in sequence.

[0025] The inner cylinder 3 is concentrically arranged inside the vertical cylinder 2, and the vertical cylinder 3 is fixedly connected to the vertical cylinder 2 through radial connecting rods 8 on the outer circumferential surfaces of the upper and lower ends. A hollow rotating shaft 9 is concentrically arranged in the inner cylinder 3. The upper and lower ends of the hollow rotating shaft 9 respectively penetrate through the top wall of the vertical cylinder 2 and the bottom wall of the bottom bin 1, and are connected to the hollow rotating shaft 9 through a sealed rotating shaft. A lifting motor 12 is provided on the base 7, and a transmission belt 13 is arranged between the motor shaft of the lifting motor 12 and the lower end of the hollow rotating shaft 9 extending out of the bottom bin 1. A lifting auger leaf 10 extending down to the bottom of the bottom bin 1 is arranged on the hollow rotating shaft 9 inside the inner cylinder 3, and a guiding inclined ring 11 inclined downward is arranged at the top of the inner cylinder 3. Under the action of the lifting auger leaf 10, the mineral powder in the bottom bin 1 can be continuously lifted upward, and then comes out of the inner cylinder 3 and falls into the swirling annular channel formed between the vertical cylinder 2 and the inner cylinder 3 under the action of the guiding inclined ring 11.

[0026] The hot air supply assembly 5 includes a hot air source 501. Specifically, the hot air source 501 can be a hot air blower, a combustion furnace, or the like. A hot air duct 502 is connected to the hot air source 501, and a connecting sleeve 503 that is hermetically and rotationally connected to the bottom of the hollow rotating shaft 9 is provided at the end of the hot air duct 502. At the top of the hollow rotating shaft 9, a duct 505 is also hermetically and rotationally connected through a connecting sleeve 503. The end of the duct 505 extends to the lower end of the swirl annular passage formed by the vertical cylinder 2 and the inner cylinder 3, and a air distribution ring 504 is connected to the end of the duct 505. Specifically, when designing the air distribution ring 504, it is arranged closely against the outer surface of the inner cylinder 3, and an inclined downward and protruding material guiding ring surface 5041 is provided at its upper end. Then, a plurality of air outlet holes 5042 are circumferentially and evenly formed in the air distribution ring 504 below the material guiding ring surface 5041, so as to avoid the falling ore powder from entering the air distribution ring 504 through the air outlet 5042 and causing blockage while ensuring the smooth discharge of hot air. In addition, a heat insulation layer is coated on the duct 505 located outside the vertical cylinder 2 to prevent a large amount of heat energy from being wasted when the hot air is transported along the duct 505.

[0027] During the operation of the vertical energy-saving ore powder dryer disclosed in Embodiment 1, the feeding device 4 feeds the ore powder to be dried into the bottom bin 1, and then the hot air supply assembly 5, the negative pressure air extraction assembly 6, and the lifting motor 12 are started simultaneously. Under the action of the hot air supply assembly 5 and the negative pressure air extraction assembly 6, the high-temperature hot air flow first flows upward from the bottom of the hollow rotating shaft 9, and then is introduced into the air distribution ring 504 by the duct 505, so that the hot air is discharged from the air outlet holes 5042 around the air distribution ring 504, then enters the swirl annular passage, and finally the discharged hot air flows along the swirl annular passage to the top of the vertical cylinder 2 and is extracted and filtered and dried by the negative pressure air extraction assembly 6.

[0028] At the same time, the fed ore powder is first conveyed upward along the inner cylinder 3 under the action of the lifting auger blade 10, and is preheated by the hot air flowing through the hollow rotating shaft 9 during the upward conveying process. Then the ore powder is discharged from the top of the inner cylinder 3, and is evenly discharged into the swirl annular passage from all around under the action of the material guiding inclined ring 11, and moves downward along the swirl annular passage. During its movement, it will come into contact with the upward flowing hot air, so as to realize the rapid heating and volatilization of the internal moisture, and then fall into the bottom bin 1, and then the hollow rotating shaft 9 and the lifting auger blade 10 convey the once-dried ore powder upward again. After repeating the above steps several times, when the ore powder is dried to the required moisture content, the gate valve on the discharge part 101 is opened, and the dried ore powder can be discharged and collected. Embodiment 2

[0029] Embodiment 2 discloses a vertical energy-saving ore powder dryer which is improved and designed based on the technical solution in Embodiment 1, and the same parts as those in Embodiment 1 will not be described again.

[0030] Reference appendixFigure 3 , attached Figure 4 , attached Figure 6 and attached Figure 7 , in Embodiment 2, a swirl adjustment mechanism 14 is provided in the swirl annular passage above the air distribution ring 504. Specifically, the swirl adjustment mechanism 14 includes a plurality of sector plates 141 arranged in an annular array in the swirl annular passage, and when all the sector plates 141 are in a horizontal state, the swirl annular passage can be closed. A shaft rod 142 arranged radially is integrally formed at the middle position of each sector plate 141. The two ends of the shaft rod 142 are respectively rotatably connected to the round holes on the vertical cylinder 2 and the inner cylinder 3, and the outer end of the shaft rod 142 extends out of the vertical cylinder 2. Then, a transmission mechanism for simultaneously driving all the shaft rods 142 to rotate is arranged on the outer circular surface of the vertical cylinder 2.

[0031] Specifically, the transmission mechanism includes a slotted hole ring 143 rotatably arranged on the outer surface of the vertical cylinder 2, and a slide rail ring 144 is fixedly arranged on the outer surface of the vertical cylinder 2, so that the slotted hole ring 143 is rotationally installed on the slide rail ring 144 in a limited manner. A toothed ring 145 is arranged on the outer circular surface of the slotted hole ring 143. Then, a power motor 146 is fixedly installed on the vertical cylinder 2, and a gear 147 meshing with the toothed ring 145 is arranged on the motor shaft of the power motor 146. Under the power input of the power motor 146 and the meshing transmission of the gears, the slotted hole ring 143 can accurately rotate a certain angle.

[0032] Oblique slotted holes 148 corresponding to each shaft rod 142 are circumferentially and evenly formed on the outer circular surface of the slotted hole ring 143. Then, an end strip 149 is connected to the outer end of the shaft rod 142, and a convex column 140 or a roller extending into the oblique slotted hole 148 and acting with it is fixedly connected to the end strip 149.

[0033] Through the design of the above-mentioned swirl adjustment mechanism 14 in Embodiment 2, during the process of the feeding device 4 feeding the ore powder, first, all the sector plates 141 are adjusted to the horizontal state to close the swirl annular passage. Then, the fed ore powder can be lifted up and down by the hollow rotating shaft 9 and the lifting auger blades 10 and fall into the swirl annular passage. Then, the sector plates 141 separate it from the bottom bin 1, so that the entire dryer can feed more ore powder to be dried at one time.

[0034] After the feeding is completed, the dynamic hot air supply component 5 and the negative pressure air extraction component 6 are started simultaneously, and then the power motor 146 is controlled to rotate by a certain angle. Under the meshing drive of the gear 147 and the gear ring 145, the slot hole ring 143 rotates by a certain angle. At this time, under the action of the inclined slot holes 148, the convex columns 140, the end strips 149 and the shaft rod 142, all the sector plates 141 rotate by a certain angle around the shaft rod 142, so that an inclined air guiding groove is formed between two adjacent sector plates 141, and the ore powder originally accumulated on the sector plates 141 also falls into the bottom bin 1. During the subsequent operation, the high-temperature air flow discharged from the air distribution ring 504 can form a spiral rising air flow after being guided by the sector plates 141, thereby increasing the contact time between the high-temperature air flow moving downward in the swirl ring channel and the falling ore powder, so that it can fully dry the ore powder.

[0035] For a period of time before the ore powder is almost dried, the diversion angle between the sector plate 141 and the horizontal plane is reduced by controlling the power motor 146 to rotate by a certain angle, further increasing the movement duration of the high-temperature air flow in the swirl ring channel, improving the heat utilization of the high-temperature air flow in the subsequent ore powder drying process, reducing the intake of the high-temperature air flow on the premise of ensuring thorough drying of the ore powder, and realizing the energy saving and emission reduction effect during the operation of the dryer.

[0036] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An energy-saving ore powder dryer, characterized in that, It includes a bottom bin and a vertical cylinder that are connected up and down. An inner cylinder extending into the bottom bin is fixedly arranged concentrically in the vertical cylinder, and a hollow rotating shaft is rotatably arranged concentrically in the inner cylinder. The upper and lower ends of the hollow rotating shaft respectively penetrate through the vertical cylinder and the bottom bin, and the lower end of the hollow rotating shaft extending out of the bottom bin is connected with a lifting motor. A lifting auger blade extending to the lower end of the bottom bin is arranged on the hollow rotating shaft located in the inner cylinder. A feeding device is arranged at the side end of the bottom bin, and a discharging part is arranged at the lower end of the bottom bin. A hot air supply component is connected to the end of the hollow rotating shaft, and a negative pressure air extraction component is connected to the upper end of the vertical cylinder. The hot air supply component includes a hot air source, a hot air pipe is connected to the hot air source, and the end of the hot air pipe is hermetically and rotatably connected to the bottom end of the hollow rotating shaft. The top end of the hollow rotating shaft is hermetically and rotatably connected to a guide air pipe, and the lower end of the guide air pipe is connected with a air distribution ring arranged closely against the outer surface of the lower end of the inner cylinder.

2. The energy-saving ore powder dryer according to claim 1, characterized in that, A swirl adjustment mechanism is arranged in the swirl annular channel between the vertical cylinder and the inner cylinder above the air distribution ring. The swirl adjustment mechanism includes a plurality of sector plates arranged in an annular array in the swirl annular channel. A radial shaft rod is arranged at the middle position of the sector plate, and the two ends of the shaft rod are respectively rotatably connected to the round holes on the vertical cylinder and the inner cylinder. A transmission mechanism for driving all the shaft rods to rotate synchronously is arranged on the outer circular surface of the vertical cylinder.

3. The energy-saving ore powder dryer according to claim 2, wherein The transmission mechanism includes a slot hole ring rotatably arranged on the outer circular surface of the vertical cylinder. Oblique slot holes corresponding to each shaft rod are uniformly arranged on the slot hole ring. An end strip is connected to the outer end of the shaft rod, and a convex column or a roller acting on the oblique slot hole is fixedly connected to the end strip.

4. The energy-saving ore powder dryer according to claim 3, characterized in that, A slide rail ring is arranged on the outer circular surface of the vertical cylinder. The slot hole ring is limited and rotatably installed on the slide rail ring, and a toothed ring is arranged on the slot hole ring. A power motor is fixedly installed on the vertical cylinder, and a gear meshing with the toothed ring is arranged on the power motor.

5. The energy-saving ore powder dryer according to claim 1, characterized in that A guide material inclined ring is arranged at the top of the inner cylinder. The upper end of the air distribution ring is provided with an inclined downward and protruding guide material ring surface. A plurality of air outlet holes are circumferentially and uniformly arranged on the air distribution ring below the guide material ring surface.

6. The energy-saving ore powder dryer according to claim 1, characterized in that, The negative pressure air extraction component includes a negative pressure pipe connected to the upper end of the vertical cylinder. The lower end of the negative pressure pipe is connected with a dehumidification and filtration box, and a negative pressure fan is connected to the dehumidification and filtration box.

7. The energy-saving ore powder dryer according to claim 1, wherein, The feeding device includes a feeding cylinder communicated with the bottom bin. A feeding hopper is connected to the upper surface of the outer end of the feeding cylinder. A feeding auger blade shaft is arranged inside the feeding cylinder, and the end of the feeding auger blade shaft is connected with a feeding motor.

8. The energy-saving ore powder dryer according to claim 1, wherein, It also includes a base. The bottom bin is in the shape of a frustum of a cone with a wider upper part and a narrower lower part and is installed on the base.

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