Scraper type heat exchange device

Abstract

The scraper type heat exchange device comprises a medium cylinder, a material cylinder connected into the medium cylinder in a sealed mode, end covers connected to the two ends of the medium cylinder and the two ends of the material cylinder and a main shaft rotationally connected to the two end covers, the main shaft is movably arranged in the material cylinder, a cavity is formed in the main shaft, a mounting hole is formed in the main shaft, and the mounting hole communicates with the cavity. A sleeve is fixed in each mounting hole; a transmission shaft is rotationally connected to the end cover, a scraper mechanism is slidably connected to the main shaft through a mounting hole, and a pushing mechanism for pushing the scraper mechanism to make contact with the barrel wall of the material barrel is connected to the transmission shaft; a plurality of groups of driving mechanisms for driving the scraper mechanisms to rotate are arranged in the cavity of the main shaft, and every two groups of scraper mechanisms are provided with one group of driving mechanism. The main shaft rotates to drive the scraper mechanism to rotate so as to stir the feed liquid and transfer heat, and meanwhile, the driving mechanism drives the scraper mechanism to rotate, namely, the scraper mechanism rotates while revolving along with the main shaft, so that the stirring and heat transfer efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange devices, in particular to a scraper type heat exchange device. Background Art

[0002] Scraped surface heat exchanger is a heat exchanger that uses scrapers to stir the liquid and treat the heat transfer surface to speed up the heat transfer efficiency. Scraped surface heat exchanger is suitable for the production of low viscosity liquid. During long-term use, the liquid may adhere to the inner wall of the heat exchanger, causing the heat transfer surface to easily form a coking film, so a scraped surface heat exchanger is needed to clean the coking film.

[0003] After searching, it was found that the Chinese utility model patent with authorization announcement number CN202083254U discloses a detachable inner cylinder scraper heat exchanger. It can be seen from its specification that when in use, one end of the main shaft is connected to the drive motor, and the material inlet is connected to the delivery pump. Therefore, the delivery pump continuously inputs the feed liquid into the material cylinder of the heat exchanger, and at the same time transports the heating or cooling medium in the medium cylinder. The feed liquid and the medium exchange heat. As the main shaft rotates continuously, the material scraper is driven to stir the feed liquid, thereby accelerating the heat transfer efficiency. At the same time, the end of the scraper scrapes the inner wall of the material cylinder to avoid the material sticking to the inner wall of the material cylinder to form a coking film or liquid crystallization, further ensuring the quality and hygiene standards of the feed liquid.

[0004] However, the scraper-type heat exchange device described in the above patent and the currently common heat exchange devices all have the following problems: (1) When the scraper is stirring the liquid, it can only rotate along with the main shaft and cannot rotate at the same time as the main shaft rotates, resulting in a poor stirring effect. On the one hand, the liquid cannot be stirred evenly, and on the other hand, heat cannot be transferred better; (2) When the main shaft rotates, the scraper is always in contact with the wall of the material barrel. On the one hand, the wall of the barrel will provide resistance to the scraper and reduce the rotation rate of the scraper. On the other hand, the scraper is in contact with the wall of the barrel and rotates along the wall. If there is no foreign matter such as coking film attached to the wall of the barrel, the scraper will directly cause wear to the wall of the barrel, and the scraper will also cause wear. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a scraper-type heat exchange device to solve the problems of the scraper-type heat exchange device that the scraper cannot rotate on its own and the scraper is always in contact with the wall of the material barrel.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A scraper-type heat exchange device comprises a medium cylinder, a material cylinder sealedly connected in the medium cylinder, end covers connected to both ends of the medium cylinder and the material cylinder, and a main shaft rotatably connected to the two end covers, the main shaft is movably arranged in the material cylinder, the medium cylinder is connected with a medium inlet pipe and a medium outlet pipe, the material cylinder is connected with a material inlet pipe and a material outlet pipe, the material inlet pipe and the material outlet pipe are both passed through the medium cylinder and are sealedly connected to the medium cylinder, one end of the main shaft located outside the material cylinder is fixedly connected with a gear, a cavity is arranged in the main shaft, and a plurality of groups of equidistant gears are provided on the main shaft in pairs. The mounting holes of each group are symmetrical about the axis of the main shaft, the mounting holes are connected to the cavity, and a sleeve is fixed in the mounting hole; the end cover is rotatably connected to a transmission shaft, the interior of the transmission shaft is located in the material barrel, a first motor is installed on one of the end covers, and the first motor is connected to the transmission shaft through a coupling; a scraper mechanism is slidably connected to the main shaft through the mounting hole, and a pushing mechanism for pushing the scraper mechanism to contact the barrel wall of the material barrel is connected to the transmission shaft; a driving mechanism for driving all scraper mechanisms to rotate is provided in the cavity of the main shaft.

[0007] Preferably, the scraper mechanism includes a sliding rod slidably connected to the sleeve, and a scraper connected to the outer end of the sliding rod, the scraper is located in the material barrel, the inner end of the sliding rod extends into the cavity of the main shaft, the inner wall of the sleeve is provided with a sliding groove with an annular cross-section, the outer wall of the sliding rod is connected to a sliding plate with an annular shape, the sliding plate is slidably arranged in the sliding groove, the inner wall of the sliding groove close to one end of the main shaft is connected to a first magnet through a rotating bearing, and a second magnet attracted to the first magnet is installed on the side of the sliding plate facing the main shaft.

[0008] In the above technical solution, when there is no need to scrape off foreign matter on the wall of the material barrel, the first magnet and the second magnet attract each other, so that the scraper is separated from the barrel wall, and the rotation of the main shaft drives the scraper to rotate, thereby stirring the material liquid.

[0009] Preferably, the pushing mechanism is a transmission wheel fixedly connected to the transmission shaft, the transmission wheel is located in the middle between the two mounting holes, the outer wall of the transmission wheel is provided with a plurality of protrusions protruding outward and matching with the slide rod, and recesses are formed between adjacent protrusions. When the inner end of the slide rod contacts the recessed portion, the scraper is separated from the wall of the material barrel, and the first magnet is connected with the second magnet by magnetic force, driving the transmission wheel to rotate, and the slide rod can be pushed by the protrusion to make the scraper contact with the wall of the material barrel.

[0010] In the above technical solution, when the inner end of the sliding rod contacts the recessed portion, the first magnet and the second magnet are connected by magnetic force, the scraper is separated from the wall of the material barrel, and the scraper is driven to rotate synchronously during the rotation of the main shaft. The first motor drives the transmission shaft to rotate, and the transmission shaft drives the transmission wheel to rotate, pushing the sliding rod to slide outward through the protrusion, separating the first magnet and the second magnet until the scraper contacts the wall of the material barrel, thereby facilitating the cleaning of the wall of the material barrel.

[0011] Preferably, the driving mechanism includes a partition connected to the main shaft, an outer tube rotatably connected to the partition, a first bevel gear connected to both ends of the outer tube, and a second bevel gear connected to the sliding rod. The outer tube is rotatably connected to the transmission shaft, and the partition is located between every two transmission wheels. When the first magnet is connected to the second magnet, the first bevel gear is meshed with the second bevel gear. After the first magnet is separated from the second magnet, the first bevel gear is separated from the second bevel gear; the driving mechanism also includes a third bevel gear connected to the outer tube, a rotating shaft rotatably connected to the main shaft, a fourth bevel gear and a fifth bevel gear connected to the rotating shaft, a transmission rod rotatably connected to the main shaft, and a sixth bevel gear connected to the transmission rod and meshed with the fifth bevel gear. The rotating shaft is perpendicular to the main shaft, the transmission rod is located on one side of the main shaft and parallel to the main shaft, the fourth bevel gear is meshed with the third bevel gear, the transmission rod is rotatably connected to the partition, a driving chamber is provided at one end of the main shaft, a second motor is installed in the driving chamber, and the second motor is transmission-connected to one end of the transmission rod.

[0012] In the above technical solution, when the first magnet is connected with the second magnet, the scraper is separated from the barrel wall of the material barrel, and the first bevel gear is meshed with the second bevel gear, the second motor is started, the transmission rod is driven to rotate, the transmission rod drives the sixth bevel gear to rotate, the sixth bevel gear drives the fifth bevel gear to rotate, the fifth bevel gear drives the rotating shaft to rotate, and during the rotation of the rotating shaft, the outer tube is driven to rotate through the cooperation of the fourth bevel gear and the third bevel gear, and the outer tube drives the second bevel gear to rotate through the first bevel gear, thereby driving the slide rod to rotate, and the slide rod drives the scraper to rotate, so as to realize the self-rotation of the scraper. When the protruding part of the transmission wheel pushes the slide rod outward until the scraper contacts the barrel wall of the material barrel, the first bevel gear is separated from the second bevel gear, and even if the second motor is working, it will not drive the second bevel gear to rotate, so that the scraper will not rotate, but the scraper will revolve with the main shaft, so as to facilitate the scraper to scrape foreign matter from the barrel wall of the material barrel.

[0013] Preferably, the end surface of the sliding rod facing one end of the transmission wheel is arc-shaped, the protrusion and the recess are arc-shaped, and the connection is smoothly transitioned.

[0014] In the above technical solution, the protrusion, the recessed portion of the transmission wheel and the end surface of the slide bar are all arc-shaped, which reduces the resistance during movement and facilitates the transmission wheel to drive the slide bar to slide.

[0015] Preferably, the scraper has an arc-shaped cross section and cooperates with the wall of the material barrel.

[0016] In the above technical solution, when the scraper contacts the wall of the material barrel, the outer end surface of the scraper coincides with the wall of the barrel, and when the main shaft rotates, the scraper can more easily remove foreign matter from the wall of the barrel.

[0017] Preferably, the inner wall of the sleeve at one end close to the material barrel is connected to a first sealing ring, and the inner wall of the sleeve at one end close to the cavity is connected to a second sealing ring.

[0018] The above technical solution can prevent the slurry from entering the cavity of the main shaft through the sleeve through the action of the first sealing ring and the second sealing ring.

[0019] Preferably, the end cover is connected to the end of the medium cylinder by bolts, a third sealing ring is provided at the connection between the end cover and the main shaft, and a fourth sealing ring is provided at the connection between the material cylinder and the main shaft.

[0020] The above technical solution can prevent the liquid from overflowing from the end cover through the action of the third sealing ring and the fourth sealing ring.

[0021] Compared with the prior art, the present invention has the following beneficial effects: (1) The main shaft rotates, driving the scraper mechanism to rotate, thereby stirring the liquid and transferring heat. At the same time, the driving mechanism drives the scraper mechanism to rotate. That is, while the scraper mechanism revolves with the main shaft, it also rotates, thereby improving the stirring and heat transfer efficiency.

[0022] (2) When the barrel wall of the material barrel does not need to be cleaned, the scraper mechanism is separated from the barrel wall. When the barrel wall needs to be cleaned, the scraper mechanism is pushed outward by the pushing mechanism so that the outer end of the scraper mechanism contacts the barrel wall to clean the barrel wall. The position of the scraper mechanism can be adjusted as needed so that it does not contact the barrel wall during normal operation. Only when the barrel wall needs to be cleaned, the scraper mechanism contacts the barrel wall, thereby reducing the wear of the material barrel and the scraper mechanism and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the separation of the scraper and the material barrel; Figure 2 Figure 1 A partial enlarged view of Figure 3 for Figure 2 AA section view after removing the driving mechanism; Figure 4 for Figure 3 A partial enlarged view of Figure 5 It is a schematic diagram of the contact between the scraper and the material barrel; Figure 6 for Figure 5 A partial enlarged view of Figure 7 for Figure 6 BB section view after removing the driving mechanism; Figure 8 for Figure 7 A partial enlarged view of Fig. 9 A side view of the main shaft and the driving mechanism; In the figure: 1-medium cylinder, 2-material cylinder, 3-end cover, 4-main shaft, 5-medium inlet pipe, 6-medium outlet pipe, 7-material inlet pipe, 8-material outlet pipe, 9-gear, 10-mounting hole, 11-sleeve, 12-transmission shaft, 13-first motor, 14-scraper mechanism, 14a-slide rod, 14b-scraper, 14c-slide groove, 14d-slide plate, 14e-first magnet, 14f-second magnet, 14g-rotation bearing, 15-drive mechanism, 15a -partition, 15b-outer tube, 15c-first bevel gear, 15d-second bevel gear, 15e-third bevel gear, 15f-rotating shaft, 15g-fourth bevel gear, 15h-fifth bevel gear, 15i-transmission rod, 15j-sixth bevel gear, 15k-second motor, 16-transmission wheel, 16a-protrusion, 16b-recess, 17-first sealing ring, 18-second sealing ring, 19-third sealing ring, 20-fourth sealing ring. DETAILED DESCRIPTION

[0024] 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.

[0025] Example 1 See also Figure 1 A scraper heat exchange device includes a medium cylinder 1, a material cylinder 2 sealedly connected in the medium cylinder, end covers 3 connected to both ends of the medium cylinder and the material cylinder, and a main shaft 4 rotatably connected to the two end covers, wherein the material cylinder 2 can be welded in the medium cylinder 1, which improves the structural strength and has sealing performance. The main shaft 4 is movably arranged in the material cylinder 2, the medium cylinder 1 is connected with a medium inlet pipe 5 and a medium outlet pipe 6, the material cylinder 2 is connected with a material inlet pipe 7 and a material outlet pipe 8, both of which pass through the medium cylinder 1 and are sealed with the medium cylinder 1, wherein the material inlet pipe 7 and the material outlet pipe 8 can also be welded with the medium cylinder 1 to ensure the sealing performance of the medium cylinder.

[0026] The main shaft 4 is fixedly connected to a gear 9 at one end outside the material barrel. The gear 9 is driven to rotate by an external driving device, which can drive the main shaft 4 to rotate. A cavity is provided in the main shaft 4. A plurality of groups of equidistant mounting holes 10 are provided on the main shaft 4. The two mounting holes 10 in each group are symmetrical about the axis of the main shaft 4. The mounting holes 10 are connected to the cavity. A sleeve 11 (such as Figure 4 as shown).

[0027] The end cover 3 is rotatably connected with a transmission shaft 12, the interior of the transmission shaft 12 is located in the material barrel 2, and a first motor 13 is installed on one of the end covers 3. The first motor 13 is transmission-connected to the transmission shaft 12 through a coupling. When the motor 13 is started, the transmission shaft 12 can be driven to rotate.

[0028] like Figure 3 , Figure 4 , Figure 5 As shown, a scraper mechanism 14 is slidably connected to the main shaft 4 through a mounting hole 10, and the scraper mechanism 14 includes a slide rod 14a slidably connected to the sleeve, and a scraper 14b connected to the outer end of the slide rod, the scraper 14b is located in the material barrel 2, and the inner end of the slide rod 14a extends into the cavity of the main shaft 4, the inner wall of the sleeve 11 is provided with a slide groove 14c with a ring-shaped cross-section, and the outer wall of the slide rod 14a is connected to a slide plate 14d with a ring-shaped shape, and the slide plate 14d is slidably arranged in the slide groove 14c, and the inner wall of the slide groove 14c close to one end of the main shaft is connected to a first magnet 14e through a rotating bearing, and a second magnet 14f attracted to the first magnet is installed on the side of the slide plate 14d facing the main shaft, wherein the sleeve and the rotating bearing can be made of ceramic material to prevent the generation of suction between the two and the first magnet, thereby not preventing the first magnet 14e from rotating in the sleeve 11. In addition, both the first magnet 14e and the second magnet 14f can be magnets with strong magnetic force, so that the first magnet and the second magnet will not be easily separated after being bonded.

[0029] The transmission shaft 12 is connected with a pushing mechanism for pushing the scraper mechanism 14 to contact the wall of the material barrel 2; the pushing mechanism includes a transmission wheel 16 fixedly connected to the transmission shaft, the transmission wheel is located in the middle between the two mounting holes, the outer wall of the transmission wheel 16 is provided with a plurality of protrusions 16a protruding outward and matching the slide bar 14a, and recesses 16b are formed between adjacent protrusions 16a. When the inner end of the slide bar 14a contacts the recesses 16b, the scraper 14b is separated from the wall of the material barrel 2, and the first magnet 14e is connected with the second magnet 14f by magnetic force, driving the transmission wheel 16 to rotate, and the slide bar 14a can be pushed by the protrusions 16a to make the scraper 14b contact the wall of the material barrel 2. When the inner end of the slide bar 14a contacts the recessed portion 16b, the first magnet 14e and the second magnet 14f are connected by magnetic force, and the scraper 14b is separated from the wall of the material barrel 2. The main shaft 4 drives the scraper 14b to rotate synchronously during rotation, driving the transmission shaft 12 to rotate, and the transmission shaft 12 drives the transmission wheel 16 to rotate, pushing the slide bar 14a to slide outward through the protrusion 16a, so that the first magnet 14e and the second magnet 14f are separated until the scraper 14b contacts the wall of the material barrel 2, so as to clean the foreign matter on the wall. The cross section of the scraper 14b is arc-shaped and cooperates with the wall of the material barrel 2. When the scraper 14b contacts the wall of the material barrel 2, the outer end face of the scraper 14b coincides with the wall. When the main shaft 4 rotates, the scraper 14b is easier to remove the foreign matter on the wall.

[0030] A driving mechanism 15 for driving all the scraper mechanisms 14 to rotate is provided in the cavity of the main shaft 4. The driving mechanism 15 includes a partition 15a connected to the main shaft, an outer tube 15b rotatably connected to the partition, a first bevel gear 15c connected to both ends of the outer tube, and a second bevel gear 15d connected to the slide bar. The partition 15a is located between every two transmission wheels 16. When the first magnet 14e is connected to the second magnet 14f, the first bevel gear 15c is meshed with the second bevel gear 15d. After the first magnet 14e is separated from the second magnet 14f, the first bevel gear 15c is separated from the second bevel gear 15d. The driving mechanism 15 also includes a third bevel gear 15e connected to the outer tube, a rotating shaft 15f rotatably connected to the main shaft, and a third bevel gear 15e connected to the outer tube. , a fourth bevel gear 15g and a fifth bevel gear 15h connected to the rotating shaft, a transmission rod 15i rotatably connected to the main shaft, and a sixth bevel gear 15j connected to the transmission rod and meshing with the fifth bevel gear 15h. The rotating shaft 15f is perpendicular to the main shaft 4, and the transmission rod 15i is located on one side of the main shaft and parallel to the main shaft 4, so that the rotating shaft, the transmission shaft and the transmission rod will not affect each other. The fourth bevel gear 15g is meshed with the third bevel gear 15e, and the transmission rod 15i is rotatably connected to the partition 15a. A driving chamber is provided at one end of the main shaft 4, and a second motor 15k is installed in the driving chamber. The second motor 15k is transmission-connected to one end of the transmission rod 15i.

[0031] When the first magnet 14e is connected with the second magnet 14f, the scraper 14b is separated from the wall of the material barrel 2. At this time, the first bevel gear 15c is meshed with the second bevel gear 15d, and the second motor 15k is started to drive the transmission rod 15i to rotate, and the transmission rod 15i drives the sixth bevel gear 15j to rotate, and the sixth bevel gear 15j drives the fifth bevel gear 15h to rotate, and the fifth bevel gear 15h drives the rotating shaft 15f to rotate. During the rotation of the rotating shaft 15f, the outer tube 15b is driven to rotate through the cooperation of the fourth bevel gear 15g and the third bevel gear 15e, and the outer tube 15b drives the second bevel gear 15d to rotate through the first bevel gear 15c, thereby driving the slide bar 14a to rotate, and the slide bar 14a drives the scraper 14b to rotate, so as to realize the self-rotation of the scraper 14b. When the protrusion 16a of the transmission wheel 16 pushes the slide bar 14a outward until the scraper 14b contacts the wall of the material barrel 2, the first bevel gear 15c is separated from the second bevel gear 15d. Even if the second motor 15k works, it will not drive the second bevel gear 15d to rotate, so that the scraper 14b will not rotate on its own. Instead, the scraper 14b will revolve with the main shaft 4, so that the scraper 14b can scrape away foreign matter on the wall of the material barrel.

[0032] The end surface of the slide bar 14a facing the transmission wheel 16 is arc-shaped, and the protrusion 16a and the recess 16b are arc-shaped and the connection is smooth. The protrusion 16a, the recess 16b of the transmission wheel 16 and the end surface of the slide bar 14b are all arc-shaped, which reduces the resistance during movement and facilitates the transmission wheel 16 to drive the slide bar 14a to slide.

[0033] The working principle of this example is as follows: liquid enters from the material inlet pipe 7 and enters the material barrel 2, the heating medium enters from the medium inlet pipe 5 and enters the medium barrel 1, the liquid flows in the material barrel 2, the heating medium rotates in the medium barrel 1, the liquid is heated by the heating medium, and finally the liquid flows out from the material outlet pipe 8, and the heating medium is discharged from the medium outlet pipe 6. When the liquid flows in the material barrel, the gear 9 is driven to rotate by the external driving device, and the gear drives the main shaft 4 to rotate, and the main shaft 4 drives all the scrapers 14b to rotate together, that is, to revolve around the main shaft. At this time, the first magnet 14e and the second magnet 14f attract each other, and the first bevel gear 15c is meshed with the second bevel gear 15d. Since the second magnet 14f is rotatably connected to the sleeve 11 through the rotating bearing 14g, after starting the second motor 15k, the outer tube 15b is driven to rotate through the action of the transmission rod 15i, the sixth bevel gear 15j, the fifth bevel gear 15j, the fourth bevel gear 15g, and the third bevel gear 15e. The outer tube 15b drives the second bevel gear 15d to rotate through the first bevel gear 15c, thereby driving the slide bar 14a, the first magnet 14e, and the second magnet 14f to rotate at the same time, and the slide bar 14a drives the scraper 14b to rotate, thereby realizing the self-rotation of the scraper 14b. The scraper's revolution and rotation are carried out simultaneously, which greatly improves the efficiency of stirring and heat transfer.

[0034] When the barrel wall of the material barrel 2 needs to be cleaned, the first motor 13 is started to drive the transmission shaft 12, and the transmission shaft 12 drives the transmission wheel 16 to rotate. The transmission wheel 16 pushes the slide bar 14a to slide outward through the protrusion 16a, so that the first magnet 14e and the second magnet 14f are separated, until the scraper 14b contacts the barrel wall of the material barrel 2, and then the main shaft 4 is driven to rotate, which can drive the scraper 14b to revolve with the main shaft to clean the foreign matter on the barrel wall. Moreover, after the scraper 14b contacts the barrel wall of the material barrel 2, the first bevel gear 15c is separated from the second bevel gear 15d. When the second motor is working, it will not drive the second bevel gear 15d to rotate, so that the scraper 14b will not rotate, but the scraper 14b will revolve with the main shaft 4, so that the scraper 14b can scrape the foreign matter on the barrel wall of the material barrel 2.

[0035] Example 2 On the basis of Example 1, the inner wall of the sleeve 11 close to the material barrel is connected with a first sealing ring 17, and the inner wall of the sleeve 11 close to the cavity is connected with a second sealing ring 18. The first sealing ring and the second sealing ring can prevent the liquid from entering the cavity of the main shaft through the sleeve.

[0036] The end cover 3 is connected to the end of the medium cylinder 1 by bolts, a third sealing ring 19 is provided at the connection between the end cover 3 and the main shaft 4, and a fourth sealing ring 20 is provided at the connection between the material cylinder 2 and the main shaft 4. The third sealing ring and the fourth sealing ring can prevent the liquid from overflowing from the end cover.

[0037] It should be noted that the terms "include", "comprises" or any other variations 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. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0038] 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 scraper-type heat exchange device, comprising a medium cylinder (1), a material cylinder (2) sealedly connected in the medium cylinder, end covers (3) connected to both ends of the medium cylinder and the material cylinder, and a main shaft (4) rotatably connected to the two end covers, the main shaft (4) being movably arranged in the material cylinder (2), the medium cylinder (1) being connected to a medium inlet pipe (5) and a medium outlet pipe (6), the material cylinder (2) being connected to a material inlet pipe (7) and a material outlet pipe (8), the material inlet pipe (7) and the material outlet pipe (8) both passing through the medium cylinder (1) and being sealedly connected to the medium cylinder (1), Features: The main shaft (4) is fixedly connected to a gear (9) at one end located outside the material barrel, a cavity is provided in the main shaft (4), and a plurality of groups of equidistant mounting holes (10) are provided on the main shaft (4), the two mounting holes (10) in each group are symmetrical about the axis of the main shaft (4), the mounting holes (10) are connected to the cavity, and a sleeve (11) is fixed in the mounting hole (10); the end cover (3) is rotatably connected to a transmission shaft (12), the interior of the transmission shaft (12) is located in the material barrel (2), a first motor (13) is installed on one of the end covers (3), and the first motor (13) is transmission-connected to the transmission shaft (12) through a coupling; a scraper mechanism (14) is slidably connected to the main shaft (4) through the mounting hole (10), and a driving mechanism for driving the scraper mechanism (14) to contact the barrel wall of the material barrel (2) is connected to the transmission shaft (12); a driving mechanism (15) for driving all the scraper mechanisms (14) to rotate is provided in the cavity of the main shaft (4); The scraper mechanism (14) comprises a slide rod (14a) slidably connected to the sleeve, and a scraper (14b) connected to the outer end of the slide rod, the scraper (14b) is located in the material barrel (2), the inner end of the slide rod (14a) extends into the cavity of the main shaft (4), the inner wall of the sleeve (11) is provided with a slide groove (14c) with a ring-shaped cross section, the outer wall of the slide rod (14a) is connected to a slide plate (14d) with a ring shape, the slide plate (14d) is slidably arranged in the slide groove (14c), the inner wall of the slide groove (14c) close to one end of the main shaft is connected to a first magnet (14e) through a rotating bearing (14g), and a second magnet (14f) attracted to the first magnet is installed on the side of the slide plate (14d) facing the main shaft; The pushing mechanism comprises a driving wheel (16) fixedly connected to the driving shaft (12), the driving wheel (16) being located in the middle between the two mounting holes (10), the outer wall of the driving wheel (16) being provided with a plurality of protrusions (16a) protruding outward and matching with the slide bar (14a), recesses (16b) being formed between adjacent protrusions (16a), and when the inner end of the slide bar (14a) contacts the recesses (16b), the scraper (14b) is separated from the wall of the material barrel (2), and the first magnet (14e) is connected to the second magnet (14f) by magnetic force; the driving wheel (16) is driven to rotate, and the slide bar (14a) can be pushed to move in the direction of the material barrel through the protrusions (16a), so that the scraper (14b) contacts the wall of the material barrel (2); The driving mechanism (15) comprises a partition (15a) connected to the main shaft, an outer tube (15b) rotatably connected to the partition, a first bevel gear (15c) fixedly connected to both ends of the outer tube, and a second bevel gear (15d) connected to the opposite ends of the two slide bars. The outer tube (15b) is rotatably connected to the transmission shaft (12). The partition (15a) is located between every two transmission wheels (16). When the first magnet (14e) is connected to the second magnet (14f), the first bevel gear (15c) is meshed with the second bevel gear (15d). After the first magnet (14e) is separated from the second magnet (14f), the first bevel gear (15c) is separated from the second bevel gear (15d). The driving mechanism (15) also comprises a third bevel gear (15c) connected to the outer tube. A gear (15e), a rotating shaft (15f) rotatably connected to the main shaft, a fourth bevel gear (15g) and a fifth bevel gear (15h) connected to the rotating shaft, a transmission rod (15i) rotatably connected to the main shaft, and a sixth bevel gear (15j) connected to the transmission rod and meshing with the fifth bevel gear (15h), the rotating shaft (15f) is perpendicular to the main shaft (4), the transmission rod (15i) is located on one side of the main shaft and is parallel to the main shaft (4), the fourth bevel gear (15g) is meshed with the third bevel gear (15e), the transmission rod (15i) is rotatably connected to the partition plate (15a), a driving chamber is provided at one end of the main shaft (4), a second motor (15k) is installed in the driving chamber, and the second motor (15k) is transmission-connected to one end of the transmission rod (15i).

2. A scraped surface heat exchange device according to claim 1, It is characterized in that The end surface of the sliding rod (14a) facing the transmission wheel (16) is arc-shaped, and the protruding portion (16a) and the recessed portion (16b) are arc-shaped, and the connection portion has a smooth transition.

3. A scraped surface heat exchange device according to claim 2, It is characterized in that The scraper (14b) has an arc-shaped cross section and cooperates with the wall of the material barrel (2).

4. A scraped surface heat exchange device according to claim 3, It is characterized in that The inner wall of the sleeve (11) at one end close to the material barrel is connected to a first sealing ring (17), and the inner wall of the sleeve (11) at one end close to the cavity is connected to a second sealing ring (18).

5. A scraped surface heat exchange device according to claim 4, It is characterized in that The end cover (3) is connected to the end of the medium cylinder (1) by means of bolts; a third sealing ring (19) is provided at the connection between the end cover (3) and the main shaft (4); and a fourth sealing ring (20) is provided at the connection between the material cylinder (2) and the main shaft (4).

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