Scraped film dryer with spiral propelling type fixed scraper

Abstract

The invention discloses a wiped film dryer with a spiral propelling type fixed scraper, belongs to the technical field of wiped film dryers, and aims to solve the problems that raw materials dried by an existing dryer are non-uniform in discharge and different in particle size, unqualified raw materials cannot be removed for re-drying, and hot air at the top of the dryer cannot be used for carrying out auxiliary drying on the raw materials in the dryer. A transmission rod is rotationally connected into the dryer body, a re-drying mechanism facilitating screening and repeated drying of materials which are not completely dried is arranged at the bottom of the dryer body, and a heat recovery mechanism facilitating auxiliary drying through hot air in the dryer body is arranged on one side of the dryer body. The transmission rod is provided with a scraper blade drying mechanism facilitating uniform drying and dispersing of materials. According to the wiped film dryer with the spiral propelling type fixed scraper, the connecting plate is connected to the transmission rod rotating in the dryer body, and the connecting plate is connected with the fixed scraper and the movable scraper, so that raw materials can be dried step by step.

Description

Technical Field

[0001] The invention relates to the technical field of scraping film dryers, in particular to a scraping film dryer with a spirally propelled fixed scraper. Background Art

[0002] The scraped film dryer is an ideal equipment for drying heat-sensitive surfactants. The material stays in the dryer for a short time, the drying effect is good, and energy is saved.

[0003] When in use, the above-mentioned device does not have the structure for improving the drying effect of the dryer, removing and re-drying the unqualified raw materials, and recovering heat energy for auxiliary drying. As a result, when the existing dryer used for heat-sensitive surfactants is in use, the scrapers inside the dryer are mostly movable scrapers, and there are fewer fixed scrapers in the middle layer. The raw materials cannot stay on the scrapers for a short time to improve the drying effect, which easily leads to uneven discharge of the raw materials after drying, and the particles are of different sizes and shapes. In addition, the raw materials directly enter the next equipment for processing after being dried by the dryer, and the unqualified products cannot be screened out and re-dried. At the same time, due to the high internal temperature and the principle of thermal expansion and contraction, the hotter air is mostly gathered at the top, and the high and low temperature difference is large, and the drying process cannot be completely and effectively carried out, which is inconvenient to use. Based on the deficiencies of the existing technology, the present invention designs a scraping dryer with a spiral propulsion-shaped fixed scraper. Summary of the invention

[0004] The invention provides a scraping film dryer with a spiral propulsion-shaped fixed scraper, which has the advantages of improving the drying effect of the dryer, removing and re-drying unqualified raw materials, and recovering heat energy for auxiliary drying.

[0005] The present invention provides the following technical solution: a film scraping dryer with a spiral propulsion fixed scraper, comprising a dryer body, a transmission rod is rotatably connected inside the dryer body, a re-drying mechanism is arranged at the bottom of the dryer body for screening and repeatedly drying incompletely dried materials, a heat recovery mechanism is arranged on one side of the dryer body for utilizing hot air in the dryer body for auxiliary drying, and a scraper drying mechanism is arranged on the transmission rod for uniformly drying and spreading the materials;

[0006] The scraper drying mechanism comprises a connecting plate, a connecting tube, a movable scraper and a connecting shaft, wherein the connecting plate is fixedly connected to the side wall of the transmission rod, the connecting tube is fixedly connected to the connecting plate, the connecting shaft is slidably inserted in the interior of the connecting tube, and the movable scraper is fixedly connected to the outer end of the connecting shaft.

[0007] As a preferred technical solution of the present invention, the scraper drying mechanism also includes a fixed scraper, a limiting circular plate and a spring, the fixed scraper is fixedly connected to the connecting plate, the limiting circular plate is fixedly connected to the inner end of the connecting shaft, and the spring is fixedly arranged between the limiting circular plate and the connecting cylinder.

[0008] As a preferred technical solution of the present invention, the heat recovery mechanism includes a hot air duct, a fan, a dehumidification box, a connecting frame, a water collecting chute, a limit strip, a molecular sieve plate and a sealing plate. The hot air duct is fixedly connected to the side wall of the dryer body, and the inner cavity of the hot air duct is communicated with the inner cavity of the dryer body. The fan is fixedly installed on the hot air duct, the dehumidification box is fixedly connected to the hot air duct, and the dehumidification box is communicated with the inner cavity of the hot air duct, the connecting frame is fixedly connected between the dehumidification box and the dryer body, the water collecting chute is arranged at the bottom of the inner cavity of the dehumidification box, the limit strip is fixedly connected to the inner cavity wall of the dehumidification box, the molecular sieve plate is fixedly inserted in the dehumidification box, and the sealing plate is fixedly connected to the socket of the dehumidification box.

[0009] As a preferred technical solution of the present invention, the re-drying mechanism includes a connecting frame, a screening barrel, a screen, a rejection port, a gathering box, a feed pipe, a top box, a re-drying port, an auger and a lifting motor. The screening barrel is fixedly connected to the bottom of the dryer body, the connecting frame is fixedly sleeved between the dryer body and the screening barrel, the screen is fixedly connected to the inside of the screening barrel, the rejection port is penetrated and opened in the side wall of the screening barrel, the gathering box is fixedly connected to the outer surface of the screening barrel, the feed pipe is fixedly connected to the upper surface of the gathering box, the top box is fixedly connected to the top of the feed pipe, the re-drying port is penetrated and opened in the inside of the dryer body, the auger is rotatably connected to the inside of the feed pipe, and the lifting motor is fixedly installed at the bottom of the gathering box.

[0010] As a preferred technical solution of the present invention, the outer surface of the dryer body is fixedly connected with a feed port communicating with the inner cavity of the dryer body, the outer surface of the dryer body is fixedly connected with a pressure relief valve communicating with the inner cavity of the dryer body, a drying compartment is opened inside the dryer body, the outer surface of the dryer body is fixedly connected with a heat medium inlet communicating with the inner cavity of the drying compartment, and the outer surface of the dryer body is fixedly connected with a heat medium outlet communicating with the inner cavity of the drying compartment.

[0011] As a preferred technical solution of the present invention, a reducer is fixedly connected to the top of the dryer body, a drying motor is fixedly installed on the top of the reducer, and the transmission rod is rotatably connected to the output end at the bottom of the reducer.

[0012] As a preferred technical solution of the present invention, the scraper drying mechanism has twenty-six layers, the connecting tube, movable scraper, limiting circular plate, connecting shaft and spring are arranged on the first to third layers, the fixed scraper is arranged on the fourth to twenty-sixth layers, the movable scraper on the fourth to thirteenth layers is 4 mm away from the inner cavity wall of the dryer body, the movable scraper on the fourteenth to eighteenth layers is 3 mm away from the inner cavity wall of the dryer body, and the movable scraper on the nineteenth to twenty-sixth layers is 2 mm away from the inner cavity wall of the dryer body.

[0013] As a preferred technical solution of the present invention, the feed pipe is rotatably connected to the output end of the lifting motor, and the rejection port is kept flush with the lower end of the screen.

[0014] As a preferred technical solution of the present invention, an observation window for observing the water collecting chute is arranged on the outside of the dehumidification box, and the air flows from top to bottom in the hot air duct.

[0015] As a preferred technical solution of the present invention, the limiting circular plate is slidably connected to the interior of the connecting cylinder, and the spring is movably sleeved on the connecting shaft.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. A film scraping dryer with a spiral propulsion fixed scraper, which connects a heat medium inlet and a heat medium outlet to an external heating device. After starting, the external heating device sends the heat medium into the drying compartment to increase the temperature inside the dryer body. At this time, the raw material is sent into the dryer body from the feed port, and the drying motor is started and driven by the reducer to drive the transmission rod and the scraper drying mechanism to rotate. The rotating transmission rod drives the connecting plate on the transmission rod to rotate accordingly. The movable scrapers of the first to third layers move outward under the centrifugal force and the limit of the limit circular plate and the connecting shaft to contact the inner cavity wall of the dryer body. At this time, the raw material entering the dryer body is dispersed by the movable scraper to increase the contact area with the hot air and then falls onto the fixed scraper. Since the fixed scraper is fixed, the raw material will stay on the fixed scraper for a short period of time after falling on it to improve the drying effect, until the raw material falls step by step and separates from the fixed scraper on the bottom layer. The device is convenient for drying the raw material.

[0018] 2. In a scraper dryer with a spiral-propelled fixed scraper, the dried material discharged from the dryer body enters the screening barrel and falls on the screen. The dried material of qualified size falls directly from the holes of the screen and enters other equipment for processing, while the unqualified large pieces of dried material pass through the rejection port and enter the collection box under the action of the inclination of the screen and its own gravity. At this time, the lifting motor is started to drive the auger to rotate. The unqualified raw materials in the collection box are slowly lifted up by the feeding pipe under the rotation of the auger until they are sent into the top box and re-put into the dryer body through the re-drying port for repeated drying by the scraper drying mechanism. This device is convenient for screening and re-drying of unqualified dried products.

[0019] 3. The scraping dryer with a spiral-propelled fixed scraper can start the fan to draw the hot air with high humidity at the top of the inner cavity of the dryer body into the hot air duct and send it to the dehumidification box. The hot air with high humidity entering the dehumidification box comes into contact with the molecular sieve plate. Since the molecular sieve plate has a large number of micropores and mesoporous structures, the hot air with high humidity will precipitate the water vapor contained in the hot air when passing through the molecular sieve plate. At this time, the hot air with low humidity that passes through the molecular sieve plate re-enters the hot air duct and is transmitted back to the dryer body to circulate from bottom to top to perform auxiliary drying treatment on the raw materials in the dryer body. The device is convenient for auxiliary drying of the raw materials in the dryer body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the dryer body of the present invention when viewed from above;

[0022] Figure 3 It is a schematic diagram of the internal cross-sectional structure of the dryer of the present invention;

[0023] Figure 4 It is a schematic cross-sectional view of the structure of the re-drying mechanism of the present invention;

[0024] Figure 5 This is a schematic diagram of the heat recovery mechanism structure of the present invention;

[0025] Figure 6 It is a schematic diagram of the transmission rod structure of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of the scraper drying mechanism of the present invention;

[0027] Figure 8 It is a schematic diagram of the cross-sectional structure of the movable scraper and the connecting tube of the present invention.

[0028] In the figure: 1. Dryer body; 101. Feeding port; 102. Pressure relief valve; 103. Heat medium inlet; 104. Heat medium outlet; 105. Drying compartment; 2. Transmission rod; 201. Speed ​​reducer; 202. Drying motor; 3. Re-drying mechanism; 301. Connection frame; 302. Screening barrel; 303. Screen; 304. Rejection port; 305. Collection box; 306. Feeding pipe; 307. Top box; 308. Re-drying port; 309. Wringer Dragon; 310, lifting motor; 4, heat recovery mechanism; 401, hot air duct; 402, fan; 403, dehumidification box; 404, connecting frame; 405, water collection chute; 406, limit strip; 407, molecular sieve plate; 408, sealing plate; 5, scraper drying mechanism; 501, connecting plate; 502, fixed scraper; 503, connecting cylinder; 504, movable scraper; 505, limit circular plate; 506, connecting shaft; 507, spring. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-8 A film scraping dryer with a spiral propulsion fixed scraper comprises a dryer body 1, a transmission rod 2 is rotatably connected inside the dryer body 1, a re-drying mechanism 3 is arranged at the bottom of the dryer body 1 for screening and repeatedly drying the incompletely dried material, a heat recovery mechanism 4 is arranged on one side of the dryer body 1 for using the hot air in the dryer body 1 for auxiliary drying, a scraper drying mechanism 5 is arranged on the transmission rod 2 for drying and spreading the material evenly, a feed port 101 is fixedly connected to the outer surface of the dryer body 1 and communicated with the inner cavity of the dryer body 1, and the dryer The outer surface of the dryer body 1 is fixedly connected with a pressure relief valve 102 which is communicated with the inner cavity of the dryer body 1. A drying compartment 105 is provided inside the dryer body 1. The outer surface of the dryer body 1 is fixedly connected with a heat medium inlet 103 which is communicated with the inner cavity of the drying compartment 105. The outer surface of the dryer body 1 is fixedly connected with a heat medium outlet 104 which is communicated with the inner cavity of the drying compartment 105. The top of the dryer body 1 is fixedly connected with a reducer 201. A drying motor 202 is fixedly installed on the top of the reducer 201. The transmission rod 2 is rotatably connected to the output end at the bottom of the reducer 201.

[0031] By providing a drying compartment 105, the temperature of the inner cavity of the dryer body 1 can be increased, and the raw materials in the dryer body 1 can be effectively dried. By providing a pressure relief valve 102, excessive pressure can be prevented after the temperature in the dryer body 1 is increased. By providing a heat medium inlet 103 and a heat medium outlet 104, the drying compartment 105 can be connected to an external heating device to realize heat medium circulation.

[0032] See also Figure 6-8, the scraper drying mechanism 5, the scraper drying mechanism 5 includes a connecting plate 501, a connecting cylinder 503, a movable scraper 504 and a connecting shaft 506, the connecting plate 501 is fixedly connected to the side wall of the transmission rod 2, the connecting cylinder 503 is fixedly connected to the connecting plate 501, the connecting shaft 506 is slidably inserted in the interior of the connecting cylinder 503, and the movable scraper 504 is fixedly connected to the outer end of the connecting shaft 506. The scraper drying mechanism 5 also includes a fixed scraper 502, a limiting circular plate 505 and a spring 507. The fixed scraper 502 is fixedly connected to the connecting plate 501, the limiting circular plate 505 is fixedly connected to the inner end of the connecting shaft 506, and the spring 507 is fixedly arranged on the limiting circular plate 505. Between the scraper drying mechanism 5 and the connecting cylinder 503, the number of layers is twenty-six. The connecting cylinder 503, the movable scraper 504, the limiting circular plate 505, the connecting shaft 506 and the spring 507 are arranged on the first to third layers, and the fixed scraper 502 is arranged on the fourth to twenty-sixth layers. The movable scraper 504 on the fourth to thirteenth layers is 4 mm away from the inner cavity wall of the dryer body 1, the movable scraper 504 on the fourteenth to eighteenth layers is 3 mm away from the inner cavity wall of the dryer body 1, and the movable scraper 504 on the nineteenth to twenty-sixth layers is 2 mm away from the inner cavity wall of the dryer body 1. The limiting circular plate 505 is slidably connected to the inside of the connecting cylinder 503, and the spring 507 is movably sleeved on the connecting shaft 506.

[0033] By arranging the movable scraper 504 and the fixed scraper 502, the raw materials can be dispersed and dried step by step. By arranging the fixed scraper 502 and the connecting plate 501 to be fixedly connected, the residence time of the raw materials on the fixed scraper 502 can be increased, and the drying degree of the raw materials can be improved. By arranging the limiting circular plate 505, the connecting shaft 506 and the spring 507, when the transmission rod 2 rotates to drive the connecting plate 501 to rotate, the movable scraper 504 can be thrown outward to contact the inner cavity wall of the dryer body 1, and when the transmission rod 2 stops, the movable scraper 504 can be retracted inward under the push of the spring 507.

[0034] See also Figure 5The heat recovery mechanism 4 includes a hot air pipe 401, a fan 402, a dehumidification box 403, a connecting frame 404, a water collecting chute 405, a limit bar 406, a molecular sieve plate 407 and a sealing plate 408. The hot air pipe 401 is fixedly connected to the side wall of the dryer body 1, and the inner cavity of the hot air pipe 401 is communicated with the inner cavity of the dryer body 1. The fan 402 is fixedly installed on the hot air pipe 401, and the dehumidification box 403 is fixedly connected to the hot air pipe 401, and the dehumidification box 403 is communicated with the inner cavity of the hot air pipe 401. The connecting frame 404 is fixedly connected between the dehumidification box 403 and the dryer body 1, the water collecting chute 405 is arranged at the bottom of the inner cavity of the dehumidification box 403, the limiting strip 406 is fixedly connected to the inner cavity wall of the dehumidification box 403, the molecular sieve plate 407 is fixedly plugged into the dehumidification box 403, the sealing plate 408 is fixedly connected to the socket of the dehumidification box 403, and an observation window for observing the inside of the water collecting chute 405 is arranged on the outside of the dehumidification box 403, and the air flow direction in the hot air duct 401 is from top to bottom.

[0035] By providing a hot air pipe 401 and a fan 402, hot air with high humidity at the top of the inner cavity of the dryer body 1 can be introduced into the dehumidification box 403. By providing a molecular sieve plate 407, water vapor contained in the hot air can be separated without significantly reducing the hot air. By providing a water collecting chute 405 and an observation window, the dehumidification efficiency of the molecular sieve plate 407 can be observed.

[0036] See also Figure 4 The re-drying mechanism 3 includes a connecting frame 301, a screening barrel 302, a screen 303, a rejection port 304, a collection box 305, a feeding pipe 306, a top box 307, a re-drying port 308, a screw dragon 309 and a lifting motor 310. The screening barrel 302 is fixedly connected to the bottom of the dryer body 1, the connecting frame 301 is fixedly sleeved between the dryer body 1 and the screening barrel 302, the screen 303 is fixedly connected to the inside of the screening barrel 302, the rejection port 304 runs through the side wall of the screening barrel 302, and the collection box 305 is fixedly connected to the outer surface of the screening barrel 302, the feeding pipe 306 is fixedly connected to the upper surface of the gathering box 305, the top box 307 is fixedly connected to the top of the feeding pipe 306, the re-drying port 308 is opened through the interior of the dryer body 1, the auger 309 is rotatably connected to the inside of the feeding pipe 306, the lifting motor 310 is fixedly installed at the bottom of the gathering box 305, the feeding pipe 306 is rotatably connected to the output end of the lifting motor 310, and the rejection port 304 is kept flush with the lower end of the screen 303.

[0037] By setting the screen 303, it is convenient to filter out the unqualified raw materials according to the size. By setting the collection box 305, it is convenient to collect the rejected unqualified raw materials. By setting the feeding pipe 306 and the auger 309, the raw materials collected in the collection box 305 can be transported upward and re-introduced into the dryer body 1 for repeated drying.

[0038] Working principle: when a film scraping dryer with a spiral propulsion fixed scraper is used, in the initial state, first, the drying chamber 105 is opened inside the dryer body 1, and the heat medium inlet 103 and the heat medium outlet 104 connected to the dryer body 1 are communicated with the inner cavity of the drying chamber 105, so as to heat up the dryer body 1 for drying treatment, and a screen 303 is installed in the screening barrel 302 connected to the bottom of the dryer body 1, and the collection box 305 and the feeding pipe 306 arranged on one side of the screening barrel 302 are communicated with the screening barrel 302, so as to collect the raw materials screened by the screen 303 after the dryer body 1 falls into the screening barrel 302, and the raw materials are collected by the feeding pipe 306. The auger 309 driven by the lifting motor 310 arranged in the dryer 6 raises the sieved raw materials to a higher place and re-sends them into the dryer main body 1 for repeated drying treatment, and the hot air pipe 401 connected to one side of the dryer main body 1 is respectively connected to the fan 402 and the dehumidification box 403, and the dehumidification box 403 is provided with a molecular sieve plate 407, so as to dehumidify the hot air in the dryer main body 1 and then re-send it into the dryer main body 1 for auxiliary drying, and at the same time, the transmission rod 2 rotating in the dryer main body 1 is connected with a connecting plate 501, and the connecting plate 501 is respectively connected to the fixed scraper 502 and the movable scraper 504, so as to dry the raw materials step by step;

[0039] When the raw material needs to be dried, firstly, the heat medium inlet 103 and the heat medium outlet 104 are connected to the external heating device. After starting, the external heating device sends the heat medium into the drying chamber 105 to increase the temperature in the dryer body 1. At this time, the raw material is sent into the dryer body 1 from the feed inlet 101, and the drying motor 202 is started and driven by the reducer 201 to drive the transmission rod 2 and the scraper drying mechanism 5 to rotate. The rotating transmission rod 2 drives the connecting plate 501 on the transmission rod 2 to rotate accordingly, and the movable scrapers 504 of the first to third layers are rotated in the centrifugal The raw materials enter the dryer body 1 and are dispersed by the movable scraper 504 to increase the contact area with the hot air, and then fall onto the fixed scraper 502. Since the fixed scraper 502 is fixed, the raw materials will stay on the fixed scraper 502 for a short period of time after falling on it to improve the drying effect, until the raw materials fall step by step and separate from the bottom fixed scraper 502. This device is convenient for drying raw materials.

[0040] When it is necessary to screen and re-dry the unqualified products, the dried materials discharged from the dryer body 1 first enter the screening barrel 302 and fall on the screen 303. The dried materials of qualified size fall directly from the holes of the screen 303 and enter other equipment for processing. The unqualified large pieces of dried materials pass through the rejection port 304 and enter the collection box 305 under the action of the inclination of the screen 303 and its own gravity. At this time, the lifting motor 310 is started to drive the auger 309 to rotate. The unqualified raw materials in the collection box 305 are slowly lifted by the feeding pipe 306 under the rotation of the auger 309 until they are sent into the top box 307, through the re-drying port 308, and are re-put into the dryer body 1 for repeated drying by the scraper drying mechanism 5. The device is convenient for screening and re-drying of unqualified products.

[0041] When the raw materials need to be auxiliary dried, first start the fan 402 to draw the hot and humid hot air at the top of the inner cavity of the dryer body 1 into the hot air pipe 401 and send it to the dehumidification box 403. The high-humidity hot air entering the dehumidification box 403 comes into contact with the molecular sieve plate 407. Since the molecular sieve plate 407 has a large number of micropores and mesoporous structures, the high-humidity hot air will precipitate the water vapor contained in the hot air when passing through the molecular sieve plate 407. At this time, the low-humidity hot air passing through the molecular sieve plate 407 re-enters the hot air pipe 401 and is transmitted back to the dryer body 1 to circulate from bottom to top to perform auxiliary drying treatment on the raw materials in the dryer body 1. The device is convenient for auxiliary drying of the raw materials in the dryer body 1.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A scraping dryer with a spiral-propelled fixed scraper, comprising a dryer body (1), characterized in that: The interior of the dryer body (1) is rotatably connected to a transmission rod (2); the bottom of the dryer body (1) is provided with a re-drying mechanism (3) for screening and repeatedly drying incompletely dried materials; one side of the dryer body (1) is provided with a heat recovery mechanism (4) for utilizing hot air in the dryer body (1) for auxiliary drying; and the transmission rod (2) is provided with a scraper drying mechanism (5) for evenly drying and spreading the materials; A scraper drying mechanism (5), the scraper drying mechanism (5) comprising a connecting plate (501), a connecting tube (503), a movable scraper (504) and a connecting shaft (506), the connecting plate (501) being fixedly connected to the side wall of a transmission rod (2), the connecting tube (503) being fixedly connected to the connecting plate (501), the connecting shaft (506) being slidably inserted into the interior of the connecting tube (503), and the movable scraper (504) being fixedly connected to the outer end of the connecting shaft (506).

2. A scraping film dryer with a spiral propulsion fixed scraper according to claim 1, characterized in that: The scraper drying mechanism (5) further comprises a fixed scraper (502), a limiting circular plate (505) and a spring (507); the fixed scraper (502) is fixedly connected to the connecting plate (501); the limiting circular plate (505) is fixedly connected to the inner end of the connecting shaft (506); and the spring (507) is fixedly arranged between the limiting circular plate (505) and the connecting cylinder (503).

3. A scraping film dryer with a spiral propulsion fixed scraper according to claim 1, characterized in that: The heat recovery mechanism (4) comprises a hot air pipe (401), a fan (402), a dehumidification box (403), a connecting frame (404), a water collecting chute (405), a limit strip (406), a molecular sieve plate (407) and a sealing plate (408); the hot air pipe (401) is fixedly connected to the side wall of the dryer body (1), and the inner cavity of the hot air pipe (401) is communicated with the inner cavity of the dryer body (1); the fan (402) is fixedly installed on the hot air pipe (401); and the dehumidification box (403) is fixedly connected to the side wall of the dryer body (1). On the hot air pipe (401), the dehumidification box (403) is communicated with the inner cavity of the hot air pipe (401), the connecting frame (404) is fixedly connected between the dehumidification box (403) and the dryer body (1), the water collecting chute (405) is arranged at the bottom of the inner cavity of the dehumidification box (403), the limiting strip (406) is fixedly connected to the inner cavity wall of the dehumidification box (403), the molecular sieve plate (407) is fixedly inserted in the dehumidification box (403), and the sealing plate (408) is fixedly connected to the socket of the dehumidification box (403).

4. A scraping film dryer with a spiral propulsion fixed scraper according to claim 1, characterized in that: The re-drying mechanism (3) comprises a connecting frame (301), a screening barrel (302), a screen (303), a rejecting port (304), a collecting box (305), a feeding pipe (306), a top box (307), a re-drying port (308), an auger (309) and a lifting motor (310); the screening barrel (302) is fixedly connected to the bottom of the dryer body (1); the connecting frame (301) is fixedly sleeved between the dryer body (1) and the screening barrel (302); the screen (303) is fixedly connected to the inside of the screening barrel (302); The rejection port (304) is opened through the side wall of the screening barrel (302), the collection box (305) is fixedly connected to the outer surface of the screening barrel (302), the feeding pipe (306) is fixedly connected to the upper surface of the collection box (305), the top box (307) is fixedly connected to the top of the feeding pipe (306), the re-drying port (308) is opened through the inside of the dryer body (1), the auger (309) is rotatably connected to the inside of the feeding pipe (306), and the lifting motor (310) is fixedly installed at the bottom of the collection box (305).

5. The scraping film dryer with a spiral propulsion fixed scraper according to claim 1, characterized in that: The outer surface of the dryer body (1) is fixedly connected with a feed port (101) communicating with the inner cavity of the dryer body (1); the outer surface of the dryer body (1) is fixedly connected with a pressure relief valve (102) communicating with the inner cavity of the dryer body (1); a drying chamber (105) is provided inside the dryer body (1); the outer surface of the dryer body (1) is fixedly connected with a heat medium inlet (103) communicating with the inner cavity of the drying chamber (105); and the outer surface of the dryer body (1) is fixedly connected with a heat medium outlet (104) communicating with the inner cavity of the drying chamber (105).

6. The scraping film dryer with a spiral propulsion fixed scraper according to claim 1, characterized in that: A reducer (201) is fixedly connected to the top of the dryer body (1), a drying motor (202) is fixedly installed on the top of the reducer (201), and the transmission rod (2) is rotatably connected to the output end at the bottom of the reducer (201).

7. The scraping film dryer with a spiral propulsion fixed scraper according to claim 2, characterized in that: The scraper drying mechanism (5) has twenty-six layers, the connecting tube (503), the movable scraper (504), the limiting circular plate (505), the connecting shaft (506) and the spring (507) are arranged on the first to third layers, the fixed scraper (502) is arranged on the fourth to twenty-sixth layers, the movable scraper (504) on the fourth to thirteenth layers is 4 mm away from the inner cavity wall of the dryer body (1), the movable scraper (504) on the fourteenth to eighteenth layers is 3 mm away from the inner cavity wall of the dryer body (1), and the movable scraper (504) on the nineteenth to twenty-sixth layers is 2 mm away from the inner cavity wall of the dryer body (1).

8. The scraping film dryer with a spiral-propelled fixed scraper according to claim 4, characterized in that: The feeding pipe (306) is rotatably connected to the output end of the lifting motor (310), and the rejection port (304) is kept flush with the lower end of the screen (303).

9. The scraping film dryer with a spiral propulsion fixed scraper according to claim 3, characterized in that: An observation window for observing the inside of the water collecting chute (405) is arranged on the outside of the dehumidification box (403), and the air flows from top to bottom in the hot air pipe (401).

10. The scraping film dryer with a spiral-propelled fixed scraper according to claim 2, characterized in that: The limiting circular plate (505) is slidably connected to the interior of the connecting tube (503), and the spring (507) is movably sleeved on the connecting shaft (506).

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