Vacuum disc dryer

Abstract

The utility model provides a vacuum disc dryer which comprises a main machine shell, a main shaft, a plurality of drying discs and a sweeping mechanism, the drying discs are located in the main machine shell, fixed to the main shaft and sequentially arranged at intervals in the axial direction of the main shaft, and the sweeping mechanism comprises a rotation driving assembly and a scraping plate located in the main machine shell; the scraping plate is located between the adjacent drying discs or located on one side of the drying disc on the outermost side, the driving rotating assembly can drive the scraping plate to rotate so that the position of the scraping plate can be switched, the scraping plate is provided with a sweeping position and a non-sweeping position, and when the scraping plate is switched to the sweeping position, the non-sweeping position can be switched to the non-sweeping position. And when the scraping plate is switched to the cleaning position, the scraping plate is in contact with the end face of the drying disc, and when the scraping plate is switched to the non-cleaning position, the scraping plate and the drying disc are spaced and not in contact. The vacuum disc dryer has high drying efficiency and a good drying effect.

Description

Technical Field

[0001] The present application relates to the technical field of vacuum drying equipment, and in particular to a vacuum disc dryer. Background Art

[0002] A vacuum disc dryer is a commonly used drying device. It features a rotating disc inside. During operation, a heat exchange medium is introduced into the disc, exchanging heat with the material and drying it. Improving the drying efficiency of vacuum disc dryers is a technical problem that requires expertise. Summary of the Invention

[0003] To solve the above problems, the present application provides a vacuum disc dryer, which includes a main housing, a main shaft, a plurality of drying discs, and a cleaning mechanism. The drying discs are located in the main housing and fixed to the main shaft and are arranged in sequence along the axial direction of the main shaft. The cleaning mechanism includes a driving assembly and a scraper located in the main housing. The scraper is located between adjacent drying discs or on the side of the outermost drying disc. The driving assembly can drive the scraper to rotate so that the scraper can switch its position. The scraper has a cleaning position and a non-cleaning position. When switched to the cleaning position, the scraper contacts the end surface of the drying disc. When switched to the non-cleaning position, the scraper and the drying disc are spaced apart and do not contact each other.

[0004] In one embodiment of a vacuum disc dryer, the driving assembly includes a roller shaft, a driving member, a gear ring and a rack, the roller shaft is fixedly connected to the scraper, the gear ring is fixedly connected to the roller shaft, the rack is meshed with the gear ring, and the driving member can drive the rack to move axially along the main shaft.

[0005] An embodiment of a vacuum disc dryer, the cleaning mechanism includes a sleeve and a bearing, the sleeve is fixed to the outside of the main housing, the inner circumference of the sleeve is provided with a first step surface, the outer circumference of the roller shaft is provided with an annular boss, and the end face of the annular boss close to the main housing is provided with a protrusion, the bearing is sleeved on the outer circumference of the roller shaft, the bearing is installed in the inner hole of the sleeve and its two ends are respectively abutted against the protrusion and the first step surface.

[0006] An embodiment of a vacuum disc dryer, wherein the cleaning mechanism includes a first sealing ring, a second sealing ring, a gasket and a cover, the inner circumference of the sleeve is provided with a second step surface and a third step surface, the second step surface is located on the side of the first step surface close to the interior of the main casing, and the third step surface is located on the side of the first step surface away from the interior of the main casing, the first sealing ring is mounted in the inner hole of the sleeve and compressed between the bearing and the second step surface, the gasket is mounted in the inner hole of the sleeve and its two ends are respectively abutted against the annular boss and the third step surface, the second sealing ring is mounted in the inner hole of the sleeve and its two ends are respectively abutted against the cover and the annular boss, the cover is sleeved outside the roller shaft, the cover is fixedly connected to the sleeve and blocks the end of the sleeve away from the main casing.

[0007] An embodiment of a vacuum disc dryer, the vacuum disc dryer includes a stirring member and a propulsion piece, the propulsion piece and the stirring member are both arranged at the outer edge of the drying disc, the main housing is provided with a feed port and a discharge port, the propulsion piece is arranged obliquely relative to the main shaft, the end of the propulsion piece close to the feed port is relatively farther away from the main shaft than the end far away from the feed port, the stirring member includes a flaky stirring member and a toothed stirring member, the toothed stirring member includes a flaky stirring body and crushing teeth, the flaky stirring member and the flaky stirring body are arranged parallel to the main shaft.

[0008] An embodiment of a vacuum disc dryer, from the feed port to the discharge port of the main casing, the interior of the main casing is divided into a wet zone, a viscous zone and a particle zone in sequence, the outer edges of all the drying discs in the wet zone are provided with the propulsion piece, part of the outer edges of the drying discs in the viscous zone are provided with the toothed stirring member, and part of the outer edges of the drying discs are provided with the propulsion piece, part of the outer edges of the drying discs in the particle zone are provided with the sheet-like stirring member, and part of the outer edges of the drying discs are provided with the propulsion piece, and the inner side of the main casing is provided with tooth grooves that cooperate with the crushing teeth of the toothed stirring member.

[0009] In one embodiment of the vacuum disc dryer, the side of the tooth portion of the crushing tooth close to the tooth groove is a plane, and the side of the tooth groove close to the crushing tooth includes two intersecting inclined surfaces, and the side of the two intersecting inclined surfaces away from the intersection line is farther away from the crushing tooth than the side close to the intersection line, so that the groove width of the tooth groove first gradually shrinks and then gradually increases.

[0010] An embodiment of a vacuum disc dryer, the vacuum disc dryer includes a feed component and a discharge component, the feed component includes a feed bin, a level meter, and a feed valve, the outlet of the feed bin is connected to the feed port of the main casing through the feed valve, the level meter is used to detect the material level of the feed bin, the discharge component includes a discharge bin, a first discharge valve and a second discharge valve, the inlet of the discharge bin is connected to the discharge port of the main casing through the first discharge valve, and the second discharge valve is arranged at the outlet of the discharge bin.

[0011] An embodiment of the vacuum disc dryer includes a drive motor, which is used to drive the main shaft to rotate. The drive motor is a variable frequency bidirectional motor.

[0012] An embodiment of a vacuum disc dryer includes a dust collector, a dust collector interface is provided on the outer shell of the dust collector, a host interface is provided on the main shell, and the dust collector interface is directly connected to the host interface.

[0013] The vacuum disc dryer provided in this application is equipped with a rotatable cleaning mechanism. When the cleaning mechanism's scraper rotates to the cleaning position, it can scrape material off the end surface of the drying disc, preventing the problem of material compaction on the disc end surface and thus reducing heat exchange efficiency, thereby improving drying efficiency and drying effect. When the cleaning mechanism's scraper rotates to the non-cleaning position, it can break up large pieces of material, thereby improving drying efficiency and drying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A front view of an embodiment of a vacuum disc dryer provided in the present application;

[0015] Figure 2 for Figure 1 Rear view;

[0016] Figure 3 for Figure 1 Left view of;

[0017] Figure 4 This is an enlarged view of the installation location of the cleaning mechanism;

[0018] Figure 5 for Figure 4 The small and medium circles show the enlarged images of the parts;

[0019] Figure 6 for Figure 2 The part circled in the middle is an enlarged view of the scraper in the cleaning position;

[0020] Figure 7 for Figure 6 An enlarged view of the cleaning mechanism with the scraper in the cutting position;

[0021] Figure 8 Schematic diagram of the matching state of the crushing teeth and tooth grooves;

[0022] Figure 9 is a schematic diagram of the cross section of the tooth groove;

[0023] Figure 10 This is a schematic diagram of the application of the vacuum disc dryer.

[0024] The following are the descriptions of the reference numerals:

[0025] 10 Main housing, 10a connecting hole, 10b tooth groove, 10c main machine interface, 10d feed port, 10e discharge port, A cylindrical portion, B trapezoidal portion, C inclined surface;

[0026] 20 spindles;

[0027] 30 discs;

[0028] 40 cleaning mechanism, 401 roller, 401a annular boss, 401b protrusion, 402 scraper, 403 driving member, 404 ring gear, 405 rack, 406 sleeve, 407 bearing, 408 first sealing ring, 409 second sealing ring, 410 sealing cover, 411 end cover, 412 clamping plate, 413 gasket;

[0029] 50 propulsion pieces;

[0030] 60 tooth-shaped stirring element, 601 sheet-shaped stirring body, 602 crushing teeth;

[0031] 70 feed assembly, 701 feed bin, 702 feed valve;

[0032] 80 discharge assembly, 801 discharge bin, 802 first discharge valve, 803 second discharge valve;

[0033] 90 drive motor

[0034] 100 dust collector, 100a dust collector interface, 100b pulse jet component, 100c filter bag;

[0035] 110 condenser; 120 vacuum pump; 130 heat medium circulation pipeline; 140 water storage tank. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0037] like Figure 1-Figure 3 As shown, the vacuum disc dryer provided in the present application includes a main housing 10 , a main shaft 20 , a plurality of discs 30 , a cleaning mechanism 40 , a feeding assembly 70 , a discharging assembly 80 and a driving motor 90 .

[0038] The main casing 10 is provided with a feed port 10d and a discharge port 10e. The feed assembly 70 is connected to the feed port 10d, and the discharge assembly 80 is connected to the discharge port 10e. During operation, the wet material enters the main casing 10 from the feed assembly 70 through the feed port 10d, and the dried material is discharged from the discharge port 10e through the discharge assembly 80 to the outside of the main casing 10. In the illustrated embodiment, the main casing 10 has a cylindrical portion A and a trapezoidal portion B located above the cylindrical portion A. The two ends of the cylindrical portion A are closed by flange end plates, and the flange end plates can be removed for temporary discharge when necessary. The feed port 10d is arranged on the upper wall surface of the trapezoidal portion B and is close to the right end of the main casing 10, and the discharge port 10e is arranged on the front side wall surface of the cylindrical portion A and is close to the left end of the main casing 10.

[0039] The main shaft 20 is inserted into the main housing 10, and the axial direction of the main shaft 20 is along the length direction of the main housing 10. The main shaft 20 is connected to the drive motor 90, and the drive motor 90 drives the main shaft 20 to rotate. In the illustrated embodiment, the main shaft 20 is a hollow structure so that a heat medium can pass through. Both ends of the main shaft 20 extend outside the main housing 10, and one end is connected to the drive motor 90 through a transmission structure. Preferably, the drive motor 90 adopts a variable frequency bidirectional motor, so that the forward and reverse rotation time of the main shaft 20 can be controlled by adjusting the speed and direction of the drive motor 90, thereby extending the residence time of the material in the main housing 10, so that a smaller volume vacuum disc dryer can achieve a larger material processing capacity.

[0040] The discs 30 are located within the main housing 10. They are fixed to the spindle 20 and spaced apart along the axis of the spindle 20. The fixing method is not limited, and can be welded or integrally formed. When the spindle 20 rotates, the discs 30 rotate with it. The discs 30 are hollow to allow for the passage of a heat medium, allowing the hollow cavity of the discs 30 to communicate with the hollow cavity of the spindle 20.

[0041] like Figure 4 As shown, the cleaning mechanism 40 includes a driving assembly and a scraper 402. The scraper 402 is located in the main housing 10, specifically between adjacent discs 30 or on the side of the outermost disc 30. The driving assembly can drive the scraper 402 to rotate. In the illustrated embodiment, the driving assembly includes a roller 401, a driving member 403 (see Figure 1), a ring gear 404 and a rack 405. The main housing 10 is provided with a connecting hole 10a, and the roller shaft 401 is inserted into the connecting hole 10a. The roller shaft 401 is located inside the main housing 10 and is fixedly connected to the scraper 402 at one end through bolts and a clamping plate 412. The roller shaft 401 is located outside the main housing 10 and is fixedly connected to the ring gear 404. Specifically, they can be assembled and fixed or integrally formed. The rack 405 is engaged with the ring gear 404, and the driving member 403 is connected to the rack 405 to drive the rack 405 to move along the axial direction of the main shaft 20. The type of the driving member 403 is not limited, for example, it can be a motor, a hydraulic cylinder or an air cylinder. When the rack 405 moves along the axial direction of the main shaft 20, it drives the ring gear 404 to rotate, and then drives the roller shaft 401 to rotate around its central axis, and then drives the scraper 402 to rotate. The central axis of the roller shaft 401 is perpendicular to the central axis of the main shaft 20. In the illustrated embodiment, as Figure 1 As shown, a plurality of cleaning mechanisms 40 are sequentially spaced apart along the axial direction of the main shaft 20, and each cleaning mechanism 40 shares a common rack 405. In other embodiments, the rotation drive assembly may also be configured as other structures. For example, a driving member 403 with a rotating output shaft may be provided, and the rotating output shaft of the driving member 403 is connected to the roller shaft 401 to drive the roller shaft 401 to rotate.

[0042] The scraper 402 rotates to switch between the cleaning position and the non-cleaning position. The scraper 402 rotates approximately 90 degrees in the forward direction from the cleaning position to the non-cleaning position, and then rotates 180 degrees in the forward direction from the non-cleaning position to return to the cleaning position. Alternatively, the scraper 402 can rotate 90 degrees in the reverse direction from the non-cleaning position to return to the cleaning position.

[0043] like Figure 6 As shown, when the scraper 402 is in the cleaning position, the width direction of the scraper 402 is along the axial direction of the main shaft 20, and the side surfaces of the scraper 402 in the width direction respectively contact the end surfaces of the two disks 30. By driving the scraper 402 to rotate or following the rotation of the disks 30, the scraper 402 can scrape off the material adhering to the end surfaces of the disks 30, thereby preventing the problem of material compaction on the end surfaces of the disks 30 and thus reducing the heat exchange efficiency, thereby improving the drying efficiency and drying effect. In the illustrated embodiment, the end surfaces of the disks 30 are conical surfaces, and the side surfaces of the scraper 402 in the width direction are inclined surfaces with the same inclination and direction as the end surfaces of the disks 30, so as to be in contact with the end surfaces of the disks 30.

[0044] like Figure 7 As shown, when the scraper 402 is in the non-cleaning position, the thickness direction of the scraper 402 is along the axial direction of the main shaft 20, and the scraper 402 is spaced apart from and does not contact the disc 30. At this time, as the disc 30 rotates, the scraper 402 can break large pieces of material into small pieces, so that the material can be dried more quickly and effectively, thereby improving the drying efficiency and drying effect.

[0045] like Figure 5 As shown, in the illustrated embodiment, the cleaning mechanism 40 further includes a sleeve 406 and a bearing 407. The sleeve 406 is fixed to the main housing 10 and surrounds the connecting hole 10a. A first step surface is provided on the inner periphery of the sleeve 406. An annular boss 401a is provided on the outer periphery of the roller shaft 401. A protrusion 401b is provided on the end face of the annular boss 401a close to the main housing 10. The bearing 407 is sleeved on the outside of the roller shaft 401, and the bearing 407 is mounted on the inner hole of the sleeve 406. The two ends of the bearing 407 are respectively in contact with the protrusion 401b and the first step surface. With this arrangement, the roller shaft 401 can rotate more stably under the support of the bearing 407. In addition, an end cover 411 can be provided on the end of the roller shaft 401 away from the main housing 10.

[0046] like Figure 5 As shown, in the illustrated embodiment, the cleaning mechanism 40 also includes a first sealing ring 408, a second sealing ring 409, a gasket 413, and a cover 410. The inner circumference of the sleeve 406 is provided with a second step surface and a third step surface. The second step surface is located on the side of the first step surface closer to the main housing 10, and the third step surface is located on the side of the first step surface away from the main housing 10. The gasket 413 is installed in the inner hole of the sleeve 406, and its two ends abut against the annular boss 401a and the third step surface respectively, thereby preventing mutual wear between the roller 401 and the sleeve 406. The first sealing ring 408 is installed in the inner hole of the sleeve 406 and is compressed between the bearing 407 and the second step surface, thereby providing a seal. The cover 410 is sleeved on the outside of the roller 401. The cover 410 is fixedly connected to the sleeve 406 and blocks the end of the sleeve 406 away from the main housing 10. The cover 410 and the sleeve 406 can be fixedly connected by bolts. The second sealing ring 409 is installed in the inner hole of the sleeve 406 and its two ends are respectively in contact with the cover 410 and the annular boss 401a to play a sealing role. This design achieves a better sealing effect and can prevent leakage from occurring at the position where the main housing 10 connects to the cleaning mechanism 40.

[0047] like Figure 6 As shown, the vacuum disc dryer further includes a propulsion piece 50 and a stirring piece. The propulsion piece 50 and the stirring piece are both arranged at the outer edge of the disc 30. The propulsion piece 50 is tilted relative to the main shaft 20 (for example, tilted at 45 degrees), so that the end of the propulsion piece 50 close to the feed port 10d is relatively farther away from the main shaft 20 from the end away from the feed port 10d. The propulsion piece 50 propels the material from the feed port 10d of the main housing 10 to the discharge port 10e of the main housing 10. The stirring piece includes a flaky stirring piece (not shown in the figure) and a toothed stirring piece 60. The toothed stirring piece 60 includes a flaky stirring body 601 and crushing teeth 602 arranged on the outside of the flaky stirring body 601. The flaky stirring piece and the flaky stirring body 601 are arranged parallel to the main shaft 20.

[0048] The interior of the main housing 10 is divided into a wet zone, a viscous zone and a particle zone from the feed port 10d to the discharge port 10e according to the properties of the material. Propelling pieces 50 are provided on the outer edges of all the discs 30 in the wet zone. Propelling pieces 50 are provided on the outer edges of some of the discs 30 in the viscous zone, and toothed stirring pieces 60 are provided on the outer edges of some of the discs 30. In some embodiments, the discs 30 with propelling pieces 50 provided on the inner and outer edges of the viscous zone and the discs 30 with stirring pieces provided on the outer edges are alternately arranged along the axial direction of the main shaft 20. Propelling pieces 50 are provided on the outer edges of some of the discs 30 in the particle zone, and sheet-like stirring pieces are provided on the outer edges of some of the discs 30. In some embodiments, the discs 30 with propelling pieces 50 provided on the inner and outer edges of the particle zone and the discs 30 with stirring pieces provided on the outer edges are alternately arranged along the axial direction of the main shaft 20. Figure 8 As shown, the main housing 10 is provided with tooth grooves 10b on the inner side thereof for cooperating with the crushing teeth 602 of the toothed stirring member 60. In this way, by configuring different numbers of propulsion pieces 50 and different numbers and types of stirring members in different material property areas, a better drying effect is achieved.

[0049] like Figure 9 As shown, the side of the tooth portion of the crushing tooth 602 near the tooth groove 10b is flat. The side of the tooth portion of the tooth groove 10b near the crushing tooth 602 includes two intersecting inclined surfaces. The side of the two intersecting inclined surfaces away from the intersection line is further away from the crushing tooth 602 than the side closer to the intersection line, causing the groove width of the tooth groove 10b to gradually decrease and then increase. In conventional vacuum disc dryers, wet and dry materials adhere to each other in the viscous zone during operation, forming large particles. This results in the problem that the large particles are dry on the outside, but not effectively dried on the inside, resulting in poor drying results. However, the present invention provides a toothed stirring member 60 in the viscous zone. When the toothed stirring member 60 rotates with the disc 30, as shown in the direction of the arrow in the figure, the large particles are pushed into the groove portion of the tooth groove 10b by the crushing teeth 602, moving from the widest area of ​​the groove portion of the tooth groove 10b to the narrowest area. When moving to the narrowest area, they are squeezed and crushed into small particles. The crushed small particles are pushed along the inclined surface along with the propelling material toward the discharge port 10e, thereby avoiding the problem of the large particles not being effectively dried on the inside, thereby improving the drying efficiency and drying effect. In the illustrated embodiment, the cross-sectional shape of the crushing teeth 602 is rectangular, the cross-sectional shape of the teeth of the tooth groove 10b is rhombus, and the width of the crushing teeth 602 is slightly smaller than the minimum width of the groove portion of the tooth groove 10b.

[0050] like Figure 2As shown, in the illustrated embodiment, the feed assembly 70 includes a feed bin 701 and a feed valve 702. The outlet of the feed bin 701 is connected to the feed port 10d through the feed valve 702. During operation, the material is fed into the feed bin 701 by a feeding device such as a screw pump. When feeding is required, the feed valve 702 is opened, and the material enters the main housing 10 from the feed bin 701 through the feed port 10d. The feed valve 702 can adopt a rotary discharge valve, which can ensure a good sealing effect under continuous feeding. A level meter can also be included, which is used to monitor the material level in the feed bin 701 in real time so as to control the start and stop of the feeding device according to the material level in the feed bin 701.

[0051] like Figure 3 As shown, in the illustrated embodiment, the discharge assembly 80 includes a discharge bin 801, a first discharge valve 802, and a second discharge valve 803. The inlet of the discharge bin 801 is connected to the discharge port 10e through the first discharge valve 802, and the outlet of the discharge bin 801 is provided with a second discharge valve 803. When discharging, the first discharge valve 802 is opened, and the material is discharged from the discharge port 10e to the discharge bin 801. When the first discharge valve 802 is open, the second discharge valve 803 remains closed to prevent air from entering the main body housing during discharge, thereby ensuring air tightness and avoiding the occurrence of the "sonic boom" phenomenon. More specifically, the first discharge valve 802 can adopt a gate, which is opened and closed by a cylinder driving the gate to move. The second discharge valve 803 can adopt a butterfly valve.

[0052] like Figure 1As shown, the vacuum disc dryer also includes a dust collector 100. The outer shell of the dust collector 100 and the main housing 10 are respectively provided with a dust collector interface 100a and a main housing interface 10c. The dust collector interface 100a directly interfaces with the main housing interface 10c. This avoids the problem of dust accumulation and clogging in the pipeline caused by using a pipeline to connect the dust collector 100 outer shell and the main housing 10. The dust collector 100 can be a bag-type dust collector 100 and can be equipped with a pulse jet component 100b to periodically backflush the filter bag 100c, blowing the dust cake adsorbed on the filter bag 100c back into the main housing 10, thereby achieving recycling of the filter bag 100c and greatly improving dust removal efficiency. In the illustrated embodiment, the outer shell of the dust collector 100 includes a tank body and a flange cover plate sealing the top opening of the tank body. The filter bag 100c can be inspected and replaced by removing the flange cover plate. The dust collector 100c can be inspected and replaced by removing the flange cover plate. The dust collector interface 100a is located at the bottom of the tank body. In the illustrated embodiment, the installation position of the dust collector 100 is at a distance from the feed port 10d that is one-third of the total length of the main casing 10. This position allows a large amount of water vapor generated when the material just enters the interior of the main casing 10 to be quickly taken away, thereby improving the drying efficiency and drying effect. It also makes the dust collector 100 farther from the main casing 10 and the discharge port 10e, so that the dust near the discharge port 10e is more likely to settle during its movement toward the dust collector 100, thereby reducing the load on the dust collector 100 and reducing the dust in the exhaust gas.

[0053] like Figure 10 As shown, in this application example, the interior of the shell of the vacuum disc dryer, the interior of the main shaft 20 and the interior of the disc 30 are connected to the heat medium circulation pipeline 130, the air inlet of the condenser 110 is connected to the clean air chamber of the dust collector 100, the vacuum pump 120 is connected to the air outlet of the condenser 110, and a water storage tank 140 is provided at the bottom of the condenser 110. The water storage tank 140 has its own liquid level monitoring and can automatically discharge according to the liquid level.

[0054] During operation, vacuum pump 120 is turned on to achieve a certain vacuum level inside main housing 10. The boiling point of water in a vacuum environment is lower than that under normal pressure, allowing for faster evaporation of moisture from the material, resulting in higher drying efficiency. Under the suction action of vacuum pump 120, the airflow, carrying dust and liquid droplets, enters dust collector 100 for dust removal. After cooling and dehumidification in condenser 110, it is further pumped away by vacuum pump 120 for discharge. The condensed moisture is collected in water tank 140, which automatically discharges wastewater based on the liquid level.

[0055] The principles and implementation methods of the present application have been described above using specific examples. The description of the above embodiments is only intended to help understand the method and core concept of the present application. It should be noted that for those skilled in the art, without departing from the principles of the present application, various improvements and modifications may be made to the present application, and such improvements and modifications also fall within the scope of protection of the present application.

Claims

1. A vacuum disc dryer, characterized in that: The vacuum disc dryer comprises a main housing (10), a main shaft (20), a plurality of discs (30), and a cleaning mechanism (40), wherein the discs (30) are located in the main housing (10) and fixed to the main shaft (20) and are arranged in sequence along the axial direction of the main shaft (20). The cleaning mechanism (40) comprises a driving assembly and a scraper (402) located in the main housing (10), wherein the scraper (402) is located between adjacent discs (30) or on the side of the outermost disc (30). The driving assembly can drive the scraper (402) to rotate so that the scraper (402) can switch its position. The scraper (402) has a cleaning position and a non-cleaning position. When switched to the cleaning position, the scraper (402) contacts the end face of the disc (30). When switched to the non-cleaning position, the scraper (402) and the disc (30) are spaced apart and do not contact each other.

2. The vacuum disc dryer according to claim 1, characterized in that: The driving assembly includes a roller shaft (401), a driving member (403), a gear ring (404) and a rack (405), wherein the roller shaft (401) is fixedly connected to the scraper (402), the gear ring (404) is fixedly connected to the roller shaft (401), the rack (405) is meshed with the gear ring (404), and the driving member (403) can drive the rack (405) to move axially along the main shaft (20).

3. The vacuum disc dryer according to claim 2, characterized in that: The cleaning mechanism (40) includes a sleeve (406) and a bearing (407). The sleeve (406) is fixed to the outside of the main housing (10). The inner periphery of the sleeve (406) is provided with a first step surface. The outer periphery of the roller shaft (401) is provided with an annular boss (401a). The end surface of the annular boss (401a) close to the main housing (10) is provided with a protrusion (401b). The bearing (407) is sleeved on the outer periphery of the roller shaft (401). The bearing (407) is installed in the inner hole of the sleeve (406) and its two ends are respectively in contact with the protrusion (401b) and the first step surface.

4. The vacuum disc dryer according to claim 3, characterized in that: The cleaning mechanism (40) includes a first sealing ring (408), a second sealing ring (409), a gasket (413) and a cover (410). The inner periphery of the sleeve (406) is provided with a second step surface and a third step surface. The second step surface is located on the side of the first step surface close to the interior of the main housing (10), and the third step surface is located on the side of the first step surface away from the interior of the main housing (10). The first sealing ring (408) is installed in the inner hole of the sleeve (406) and is compressed between the bearing (407) and the second step surface. The gasket (413) is mounted on the inner hole of the sleeve (406) and its two ends are respectively in contact with the annular boss (401a) and the third step surface; the second sealing ring (409) is mounted on the inner hole of the sleeve (406) and its two ends are respectively in contact with the cover (410) and the annular boss (401a); the cover (410) is sleeved outside the roller shaft (401); the cover (410) is fixedly connected to the sleeve (406) and blocks one end of the sleeve (406) away from the main housing (10).

5. The vacuum disc dryer according to claim 1, characterized in that: The vacuum disc dryer includes a stirring member and a propulsion piece (50), and the propulsion piece (50) and the stirring member are both arranged on the outer edge of the disc (30). The main housing (10) is provided with a feed port (10d) and a discharge port (10e). The propulsion piece (50) is tilted relative to the main shaft (20). The end of the propulsion piece (50) close to the feed port (10d) is relatively farther away from the feed port (10d) than the end of the propulsion piece (50) farther away from the main shaft (20). The stirring member includes a sheet stirring member and a tooth stirring member (60), and the tooth stirring member includes a sheet stirring body (601) and crushing teeth (602). The sheet stirring member and the sheet stirring body (601) are arranged parallel to the main shaft (20).

6. The vacuum disc dryer according to claim 5, characterized in that: From the feed port (10d) to the discharge port (10e) of the main housing (10), the interior of the main housing (10) is sequentially divided into a wet zone, a viscous zone and a particle zone. The outer edges of all the discs (30) in the wet zone are provided with the propulsion sheet (50). The outer edges of some of the discs (30) in the viscous zone are provided with the toothed stirring member (60) and the outer edges of some of the discs (30) are provided with the propulsion sheet (50). The outer edges of some of the discs (30) in the particle zone are provided with the sheet-like stirring member and the outer edges of some of the discs (30) are provided with the propulsion sheet (50). The inner side of the main housing (10) is provided with a tooth groove (10b) that cooperates with the crushing teeth (602) of the toothed stirring member (60).

7. The vacuum disc dryer according to claim 6, characterized in that: The side surface of the tooth portion of the crushing tooth (602) close to the tooth groove (10b) is a plane, and the side surface of the tooth groove (10b) close to the crushing tooth (602) includes two intersecting inclined surfaces, and the side of the two intersecting inclined surfaces away from the intersection line is farther away from the crushing tooth (602) than the side close to the intersection line, so that the groove width of the tooth groove (10b) first gradually shrinks and then gradually increases.

8. The vacuum disc dryer according to claim 1, characterized in that: The vacuum disc dryer comprises a feed assembly (70) and a discharge assembly (80), wherein the feed assembly (70) comprises a feed bin (701), a material level meter, and a feed valve (702), wherein the outlet of the feed bin (701) is communicated with the feed port (10d) of the main housing (10) via the feed valve (702), and the material level meter is used to detect the material level of the feed bin (701), and the discharge assembly (80) comprises a discharge bin (801), a first discharge valve (802), and a second discharge valve (803), wherein the inlet of the discharge bin (801) is communicated with the discharge port (10e) of the main housing (10) via the first discharge valve (802), and the second discharge valve (803) is arranged at the outlet of the discharge bin (801).

9. The vacuum disc dryer according to claim 1, characterized in that: The vacuum disc dryer comprises a drive motor (90), the drive motor (90) being used to drive the main shaft (20) to rotate, and the drive motor (90) is a variable frequency bidirectional motor.

10. The vacuum disc dryer according to any one of claims 1 to 9, characterized in that: The vacuum disc dryer comprises a dust collector (100), a housing of the dust collector (100) is provided with a dust collector interface (100a), the main housing (10) is provided with a main interface (10c), and the dust collector interface (100a) is directly connected to the main interface (10c).

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