Rake dryer and application thereof in production of N-methyl pyrrolidone

Abstract

The invention relates to the technical field of material drying, in particular to a rake dryer and application of the rake dryer in production of N-methyl-2-pyrrolidone. The multiple groups of deflection plates are rotationally connected with the driving shaft; the traction assembly is arranged in the driving shaft and connected with the deflection plate, and the deflection plate has two deflection states switched by being pulled by the traction assembly; the directional air supply assembly is arranged on the driving shaft, and the directional air supply assembly can dry the materials when the materials in the heat preservation barrel are raised by the deflection plate; the arc-shaped plate is attached to the directional air supply assembly, and the arc-shaped plate can guide air to be opposite to the raised materials; and the annular driving assembly is connected with the arc-shaped plate and the traction assembly, and the annular driving assembly can drive the arc-shaped plate to act when the deflection state of the deflection plate is changed, so that the flowing direction of gas in the heat preservation barrel is changed, and the drying effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of material drying, and specifically to a rake dryer and its application in the production of N-methylpyrrolidone. Background Art

[0002] Recycling waste batteries is a very important task. By recycling waste batteries, environmental pollution can be reduced, which is beneficial to resource conservation and reuse. Among them, by recycling the chemical substances in waste batteries, secondary utilization of materials can be achieved, reducing waste battery pollution while improving economic benefits.

[0003] In the material recycling of waste batteries, the recycling of N-methylpyrrolidone is also a conventional method. During operation, the waste batteries need to be first crushed and then poured into a rake dryer. The N-methylpyrrolidone is evaporated by high temperature and then collected. This method has good economic benefits.

[0004] The rake dryer is provided with inclined scrapers. While driving the movement of waste battery particles, the scrapers can make the waste battery particles turn horizontally in the rake dryer, making the waste battery particles evenly heated and preventing the waste battery particles from sticking to the rake dryer. However, since the inclined state of the scrapers is fixed, in order to make the waste battery particles roll back and forth, the driving motor needs to rotate forward and backward. In this process, the scrapers need to stop rotating first and then accelerate to rotate at a predetermined speed, resulting in a large load on the driving motor. At the same time, the turning of the waste battery particles is intermittent, causing the sticking phenomenon with the rake dryer to occur again and affecting the overall drying speed. Summary of the Invention

[0005] The purpose of the present invention is to provide a rake dryer and its application in the production of N-methylpyrrolidone to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: A rake dryer, comprising: A heat-insulating cylinder body, in which a driving shaft is rotatably installed; Deflection plates, provided in multiple groups and rotatably connected to the driving shaft; A traction assembly, arranged in the driving shaft and connected to the deflection plates. The deflection plates have two deflection states that can be switched by being pulled by the traction assembly; A directional air supply assembly, arranged on the driving shaft. The directional air supply assembly can dry the material when the deflection plates lift the material in the heat-insulating cylinder body; An arc-shaped plate, attached to the directional air supply assembly. The arc-shaped plate can guide the gas to impact against the lifted material; The annular drive assembly is connected to the arc-shaped plate and the traction assembly. When the deflection state of the deflection plate changes, the annular drive assembly can drive the arc-shaped plate to act, so as to change the flow direction of the gas in the heat preservation cylinder body.

[0007] As a further solution of the present invention: the inside of the drive shaft is a hollow structure, and a pulling member capable of moving along its length direction is arranged inside the drive shaft. One end of the pulling member penetrates through the end of the drive shaft and is connected with a connecting plate, and the connecting plate is connected with an electric telescopic rod arranged on the heat preservation cylinder body; A follower tube is arranged on the drive shaft, the deflection plate is rotatably installed at one end of the follower tube away from the drive shaft, and the rotating shaft of the deflection plate is connected with a connecting shaft arranged inside the follower tube, and the connecting shaft and the pulling member are connected through a fitting structure.

[0008] As a further solution of the present invention: the fitting structure includes a convex shaft connected to one end of the connecting shaft away from the deflection plate, and the convex shaft is misaligned with the rotating shaft of the connecting shaft; The fitting structure further includes a horizontal groove arranged on the pulling member, and the convex shaft can slide in the horizontal groove.

[0009] As a further solution of the present invention: the directional air supply assembly includes a first strip-shaped through groove arranged on the drive shaft and located between two adjacent groups of follower tubes, an outer sleeve of the first strip-shaped through groove is a sleeve tube fixedly connected with the heat preservation cylinder body, and an arc-shaped through groove is arranged on the sleeve tube. The gas entering the drive shaft can enter the heat preservation cylinder body through the first strip-shaped through groove and the arc-shaped through groove.

[0010] As a further solution of the present invention: first guiding through holes and second guiding through holes are symmetrically arranged on the arc-shaped plate. When the first guiding through hole or the second guiding through hole coincides with the arc-shaped through groove, the first guiding through hole or the second guiding through hole can guide the gas to be ejected directionally; A guiding groove is further arranged on the arc-shaped plate. The guiding groove is matched with the annular drive assembly, and can enable the arc-shaped plate to rotate relative to the sleeve tube, so that the first guiding through hole and the second guiding through hole can alternately coincide with the arc-shaped through groove.

[0011] As a further solution of the present invention: the guiding groove includes a spiral groove arranged along the axial direction of the arc-shaped plate, and a straight groove is arranged at each end of the spiral groove.

[0012] As a further solution of the present invention: the annular drive assembly includes multiple groups of limiting members connected with the pulling member. The limiting members penetrate through the first strip-shaped through groove, and a collar coaxial with the drive shaft is slidably sleeved between the multiple groups of limiting members; A convex rod is fixed on the collar, and the convex rod can penetrate through the conduction groove provided on the sleeve pipe and extend into the guiding groove.

[0013] As a further solution of the present invention: a plurality of groups of second strip-shaped through grooves are arranged at equal intervals in a circumferential direction at one end of the driving shaft, and a connector is hermetically and rotatably installed on the driving shaft. An annular cavity is formed between the outer wall of the connector and the driving shaft. The gas entering the connector can enter the interior of the driving shaft through the annular cavity and the second strip-shaped through grooves.

[0014] Compared with the prior art, the beneficial effects of the present invention are: By arranging the deflection plate and the traction assembly, compared with the existing rake dryer, the deflection of the deflection plate can be controlled by driving the pulling member, so that the driving motor does not have the action of forward and reverse switching. At the same time, during the process of the material being lifted and turned, the material itself also has a certain inertia. Although the direction of the lateral rolling of the material has changed, the deflection plate can still drive the material to be lifted with a smaller load and perform reverse lateral movement, thereby effectively reducing the load of the driving motor and enabling the material to continuously turn in the inner tank, which also shortens the drying time to a certain extent; By arranging the directional air supply assembly, the dry high-temperature steam entering the driving shaft can be ejected directionally under the guidance of the arc-shaped through groove, so that the dry high-temperature steam can be evenly contacted with the material lifted by the parabolic motion, further improving the drying effect of the material. At the same time, the opening of the arc-shaped through groove is smaller than the opening of the plurality of first strip-shaped through grooves, so that when the dry high-temperature steam escapes from the arc-shaped through groove, it can have a pressurized effect, thereby increasing the initial velocity of the dry high-temperature steam during spraying and enabling the dry high-temperature steam to impact the material moving in a parabolic motion, improving the drying effect on the material; By arranging the arc-shaped member, first, when the first through hole or the second through hole coincides with the arc-shaped through groove, the directional flow effect of the dry high-temperature steam can be maintained, and a spiral steam flow is generated in the inner tank to increase the temperature in the inner tank and create a higher high-temperature environment in the inner tank. Second, the material and the dry high-temperature steam move closer to each other during movement, and the impact force of the dry high-temperature steam on the material can be increased to further improve the drying effect on the material; By arranging the annular driving assembly, when the deflection state of the deflection plate changes, the first through hole or the second through hole coinciding with the arc-shaped through groove will also change its position accordingly, ensuring that when the deflection plate drives the material to turn, the dry high-temperature steam can always move relative to the material, so that during the turning process of the material, it always has a relative movement and collision state with the dry high-temperature steam, further improving the drying effect on the material. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of an embodiment of a rake dryer.

[0016] Figure 2 It is a schematic internal structure diagram of a heat preservation cylinder in an embodiment of a rake dryer.

[0017] Figure 3 It is a schematic structural diagram after removing the heat preservation cylinder in an embodiment of a rake dryer.

[0018] Figure 4 It is Figure 3 an exploded view of the structure.

[0019] Figure 5 It is Figure 3 an exploded view of the structure from another angle.

[0020] Figure 6 It is Figure 5 an enlarged view of the structure at position A in

[0021] Figure 7 It is a schematic internal structure diagram of a drive shaft in an embodiment of a rake dryer.

[0022] Figure 8 It is an exploded view of the structure of a traction assembly in an embodiment of a rake dryer.

[0023] Figure 9 It is an exploded view of the structure of a limiting member, a collar and a convex rod in an embodiment of a rake dryer.

[0024] Figure 10 It is a schematic structural diagram of an arc plate in an embodiment of a rake dryer.

[0025] Figure 11 It is a side view of an arc plate in an embodiment of a rake dryer.

[0026] In the figure: 1. Outer shell; 2. Inner tank; 3. Drive shaft; 301. First strip-shaped through groove; 302. Second strip-shaped through groove; 4. Follow-up tube; 5. Connector; 6. Pulling member; 7. Link plate; 8. Electric telescopic rod; 9. Horizontal groove; 10. Connecting shaft; 11. Convex shaft; 12. Deflection plate; 13. Limiting member; 14. Collar; 15. Convex rod; 16. Sleeve tube; 1601. Arc-shaped through groove; 1602. Conducting groove; 17. Arc plate; 18. First guiding through hole; 19. Second guiding through hole; 20. Straight groove; 21. Spiral groove. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] In addition, the elements in the present invention are referred to as "fixed to" or "disposed on" another element. It can be directly on another element or there may be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0029] Please refer to Figures 1 to 11 , in the embodiment of the present invention, a rake dryer includes: a heat preservation cylinder body, a deflection plate 12, a traction assembly, a directional air supply assembly, an arc plate 17 and an annular drive assembly.

[0030] A drive shaft 3 is rotatably installed in the heat preservation cylinder body. Further, the heat preservation cylinder body is composed of a coaxial outer shell 1 and an inner liner 2, and a sealed chamber is formed between the outer shell 1 and the inner liner 2. Two groups of interfaces are provided on the outer shell 1. High-temperature steam can enter the sealed chamber through one of the structures, and escape from the sealed chamber through the other group of interfaces, so that the high-temperature steam can pass through the sealed chamber and form a high-temperature environment inside the inner liner 2. A plurality of groups of deflection plates 12 are provided and are rotatably connected to the drive shaft 3. Among them, the rotating shaft of the drive shaft 3 is connected to a drive motor through a belt, and a certain gap is reserved between the end of the deflection plate 12 and the inner wall of the inner liner 2.

[0031] During use, by controlling the operation of the drive motor, the output shaft of the drive motor can drive the drive shaft 3 to rotate through the belt. At this time, the deflection plate 12 connected to the drive shaft 3 will make a circular motion around the drive shaft 3 as the center of rotation. At this time, when the deflection plate 12 acts on the material, it can drive the material to move inside the inner liner 2. Specifically, the deflection plate 12 can drive the material to make a circular motion along the inner wall of the inner liner 2. When the material rises to a certain height, the material can make a parabolic motion under the action of gravity and inertia, that is, the deflection plate 12 acting on the material can make the material be lifted, so as to be dispersed in the inner liner 2 and fully contact with the high temperature in the inner liner 2, so as to achieve the drying effect of the material.

[0032] Furthermore, since the deflection plate 12 is inclined during circular motion, an oblique movement force can be generated on the material when the deflection plate 12 acts on the material. As a result, during the process of the material being lifted, it can move along the length direction of the inner tank 2. At this time, the material has a tendency to roll horizontally in the inner tank 2, thereby further improving the drying effect on the material.

[0033] Through the above settings, when the deflection plate 12 makes circular motion, it can not only make the material generate a parabolic motion and be lifted to fully contact with the high temperature in the inner tank 2, but also make the material move horizontally in the inner tank 2 and produce a horizontal rolling effect. The combination of the two can improve the drying effect of the material when following the deflection plate 12 to a certain extent.

[0034] Please refer to Figure 4 、 Figures 7 to 8 The traction assembly is arranged inside the drive shaft 3 and is connected to the deflection plate 12. The deflection plate 12 has two deflection states that can be switched by being pulled by the traction assembly. Specifically, the inside of the drive shaft 3 is a hollow structure, and a pulling member 6 capable of moving along its length direction is arranged inside the drive shaft 3. One end of the pulling member 6 penetrates through the end of the drive shaft 3 and is connected with a connecting plate 7, and the connecting plate 7 is connected with an electric telescopic rod 8 arranged on the heat preservation cylinder body. A follower tube 4 is arranged on the drive shaft 3. The deflection plate 12 is rotatably installed at one end of the follower tube 4 away from the drive shaft 3, and the rotating shaft of the deflection plate 12 is connected with a connecting shaft 10 arranged inside the follower tube 4. The connecting shaft 10 and the pulling member 6 are connected through a fitting structure. The fitting structure includes a convex shaft 11 connected to one end of the connecting shaft 10 away from the deflection plate 12, and the convex shaft 11 is offset from the rotating shaft of the connecting shaft 10. The fitting structure further includes a horizontal groove 9 arranged on the pulling member 6, and the convex shaft 11 can slide in the horizontal groove 9.

[0035] In the initial state, the electric telescopic rod 8 causes the pulling member 6 to have an effect of being pulled outward through the connecting plate 7. At this time, the convex shaft 11 is in contact with one end of the horizontal groove 9, and to ensure the stability of the deflection state of the deflection plate 12 in this state. When it is necessary to make the deflection plate 12 deflect in the reverse direction, the operating end of the electric telescopic rod 8 is controlled to act in the reverse direction, so that the pulling member 6 moves in the reverse direction. At this time, the convex shaft 11 can slide in the horizontal groove 9, so that the connecting shaft 10 rotates, and drives the deflection plate 12 to perform a reverse deflection action. At this time, when the drive shaft 3 drives the deflection plate 12 to perform a circular motion, the deflection plate 12 can still drive the material to perform a lifting action, but the material will roll horizontally in the reverse direction. That is, during the repeated switching of the deflection plate 12, the material can be kept in the process of being lifted, and at the same time, the material can roll horizontally back and forth in the inner tank 2, so that the material has a process of being repeatedly stir-fried, further improving the drying effect. And during the horizontal rolling process of the material, the adhesion phenomenon between the material at the bottom and the inner wall of the inner tank 2 can be effectively avoided.

[0036] Furthermore, for the existing rake dryer, a structure such as the deflection plate 12 is also provided inside it, but the deflection direction of the deflection plate 12 is constant. At this time, in order to prevent the poor horizontal rolling effect of the material from causing the adhesion phenomenon between the material at the bottom and the inner tank 2 and improve the drying effect, it is necessary to drive the motor to drive the deflection plate 12 to perform a circular motion for a predetermined time and then move in the reverse direction. Although this can also achieve the effect in this embodiment, when the deflection plate 12 needs to switch the rotation direction during the circular motion, the deflection plate 12 needs to first decelerate to a stop and then move in the reverse direction, resulting in the material needing to stop moving in the inner tank 2 first, and then follow the deflection plate 12 to move in the reverse direction. The disadvantages are that the drive motor needs to stop first and then drive the deflection plate 12 to accelerate from a standstill to a predetermined speed, resulting in a relatively high load and a large consumption of electric energy. However, in this embodiment, only by driving the pulling member 6 can the deflection of the deflection plate 12 be controlled, so that the drive motor has no forward and reverse switching actions. At the same time, during the process of lifting and turning the material, the material itself also has a certain inertia, so that although the horizontal rolling direction of the material has changed, the deflection plate 12 can still drive the material to lift and perform a reverse horizontal movement with a relatively small load, thereby effectively reducing the load of the drive motor and enabling the material to continuously turn in the inner tank 2, and to a certain extent, shortening the drying time.

[0037] Please refer to Figures 3 to 5 , a plurality of second strip-shaped through grooves 302 are arranged at equal intervals in a circle at one end of the drive shaft 3, and a connection head 5 is rotatably and sealingly installed on the drive shaft 3. An annular cavity is formed between the connection head 5 and the outer wall of the drive shaft 3. The gas entering the connection head 5 can enter the inside of the drive shaft 3 through the annular cavity and the second strip-shaped through grooves 302; The directional air supply component is arranged on the drive shaft 3, and the directional air supply component can dry the material when the deflector 12 raises the material in the heat preservation cylinder body. The directional air supply component includes a first strip-shaped through groove 301 arranged on the drive shaft 3 and located between two adjacent groups of follower pipes 4. A sleeve pipe 16 fixedly connected to the heat preservation cylinder body is sleeved outside the first strip-shaped through groove 301. An arc-shaped through groove 1601 is arranged on the sleeve pipe 16. The gas entering the drive shaft 3 can enter the heat preservation cylinder body through the first strip-shaped through groove 301 and the arc-shaped through groove 1601.

[0038] During use, an external air pumping device (not shown in the figure) can pressurize and introduce dry high-temperature steam into the connector 5. At this time, the high-temperature steam can enter the drive shaft 3 from the annular cavity and the second strip-shaped through groove 302. Since the drive shaft 3 is in a rotating state, the dry high-temperature steam can continuously enter the drive shaft 3. When the dry high-temperature steam enters the inside of the drive shaft 3, it can escape through the second strip-shaped through groove 302. Under the guidance of the arc-shaped through groove 1601, the dry high-temperature steam can be ejected directionally, so that the dry high-temperature steam can uniformly contact the material moving in a parabolic motion, further improving the drying effect of the material.

[0039] It should be further noted that since the sleeve pipe 16 is sleeved outside the first strip-shaped through groove 301, the high-temperature steam escaping from the first strip-shaped through groove 301 can be gathered in the arc-shaped through groove 1601. Obviously, the opening of the arc-shaped through groove 1601 is smaller than the openings of multiple first strip-shaped through grooves 301, so that when the dry high-temperature steam escapes from the arc-shaped through groove 1601, it can have a pressurizing effect, thereby increasing the initial velocity when the dry high-temperature steam is ejected and enabling the dry high-temperature steam to impact the material moving in a parabolic motion, improving the drying effect on the material.

[0040] It should also be noted that since the direction of the circular motion of the deflector 12 is constant, even if the deflection state of the deflector 12 changes, the direction of the material turning is constant. Therefore, when the lateral turning direction of the material changes, the dry high-temperature steam escaping from the arc-shaped through groove 1601 can effectively act on the material to ensure the drying effect on the material.

[0041] Please refer to Figures 3 to 6 、 Figures 10 to 11The arc plate 17 is attached to the directional air supply assembly, and the arc plate 17 can guide the gas to collide with the raised materials. The arc plate 17 is symmetrically provided with a first conductive hole 18 and a second conductive hole 19. When the first conductive hole 18 or the second conductive hole 19 coincides with the arc groove 1601, the first conductive hole 18 or the second conductive hole 19 can guide the gas to be directional sprayed; For details, see Figure 10 , Figure 11 The first conducting hole 18 and the second conducting hole 19 are skewed relative to the radial direction of the arc-shaped plate 17 , and the first conducting hole 18 and the second conducting hole 19 are slanted toward the two ends of the arc-shaped plate 17 , respectively.

[0042] In the initial state, only the first conductive hole 18 or the second conductive hole 19 overlaps with the arc-shaped through groove 1601. At this time, the dry high-temperature steam escaping from the arc-shaped through groove 1601 can escape from the first conductive hole 18 or the second conductive hole 19. At this time, under the guidance of the first conductive hole 18 or the second conductive hole 19, the dry high-temperature steam can move upward obliquely. At this time, after the dry high-temperature steam collides with the material, it can also collide with the inner wall of the inner pot 2 and generate counterclockwise air flow (see Figure 11 ), and the first conducting hole 18 and the second conducting hole 19 are respectively inclined to the two ends of the arc plate 17, so that the high-temperature steam escaping from the first conducting hole 18 or the second conducting hole 19 also has a tendency to move toward the two ends of the inner pot 2, generating a spiral airflow so that the temperature in the inner pot 2 can rise again to create a higher high-temperature environment, and at the same time can offset the material lifted by the deflection plate 12. Specifically, when the material is rolled laterally to one side by the deflection plate 12, the dry high-temperature steam will flow in the opposite direction, so that the dry high-temperature steam can have a tendency to move relative to the material. Under this tendency, the impact force between the dry high-temperature steam and the material is increased, further improving the drying effect.

[0043] Through the above-mentioned arrangement, firstly, when the first conducting hole 18 or the second conducting hole 19 coincides with the arc-shaped through groove 1601, the directional flow effect of the dry high-temperature steam can be maintained, and a spiral steam flow can be generated in the inner pot 2 to increase the temperature in the inner pot 2, so that a higher high-temperature environment can be created in the inner pot 2; secondly, the material and the dry high-temperature steam move close to each other during movement, which can increase the impact force of the dry high-temperature steam on the material, so as to further improve the drying effect on the material.

[0044] See also Figures 4 to 7 , Figure 9 The arc plate 17 is also provided with a guide groove, which cooperates with the annular driving assembly to enable the arc plate 17 to rotate relative to the sleeve tube 16, so that the first conducting hole 18 and the second conducting hole 19 can alternately overlap with the arc through groove 1601; The guiding groove includes a spiral groove 21 arranged along the axial direction of the arc-shaped plate 17, and a straight groove 20 is arranged at each end of the spiral groove 21; The annular driving assembly is connected to the arc-shaped plate 17 and the traction assembly. When the deflection state of the deflection plate 12 changes, the annular driving assembly can drive the arc-shaped plate 17 to act, so as to change the flow direction of the gas in the heat preservation cylinder; The annular driving assembly includes multiple groups of limiting members 13 connected to the pulling member 6. The limiting members 13 penetrate through the first strip-shaped through groove 301, and a collar 14 coaxial with the driving shaft 3 is slidably sleeved between multiple groups of the limiting members 13; A convex rod 15 is fixed on the collar 14, and the convex rod 15 can penetrate through the conduction groove 1602 provided on the sleeve pipe 16 and extend into the guiding groove.

[0045] During use, since the driving shaft 3 is in a rotating state, at this time the pulling member 6 can follow the driving shaft 3 to make a circular motion, and at the same time the limiting member 13 will also make a circular motion. The collar 14 is slidably arranged on the limiting member 13, and the convex rod 15 slides in the conduction groove 1602, so that when the driving shaft 3 rotates, the limiting member 13 can rotate relative to the collar 14. At this time, the convex rod 15 is restricted in the straight groove 20, so that the arc-shaped plate 17 can maintain an axial locking state with the sleeve pipe 16, so as to improve the stability of the first guiding through hole 18 or the second guiding through hole 19 in the state of coinciding with the arc-shaped through groove 1601.

[0046] When the pulling member 6 acts to switch the deflection state of the deflection plate 12, the limiting member 13 will also drive the collar 14 to move along the length direction of the driving shaft 3. At this time, the collar 14 drives the convex rod 15 to move along the length direction of the conduction groove 1602 and makes the convex rod 15 move towards the spiral groove 21. During this process, the convex rod 15 can cooperate with the spiral groove 21, so that the arc-shaped plate 17 rotates relative to the sleeve pipe 16, and the position of the first guiding through hole 18 or the second guiding through hole 19 coinciding with the arc-shaped through groove 1601 is switched. Therefore, when the deflection state of the deflection plate 12 changes, the first guiding through hole 18 or the second guiding through hole 19 coinciding with the arc-shaped through groove 1601 also changes its position accordingly. When the deflection plate 12 drives the material to be turned over, the dry high-temperature steam can always move relative to the material.

[0047] Through the above settings, when the deflection state of the deflection plate 12 changes, the first guiding through hole 18 or the second guiding through hole 19 coinciding with the arc-shaped through groove 1601 will also change its position accordingly, so as to ensure that when the deflection plate 12 drives the material to be turned over, the dry high-temperature steam can always move relative to the material, so that during the process of turning over the material, it always has a relative motion and a collision state with the dry high-temperature steam, further improving the drying effect on the material.

[0048] As an embodiment of the present invention, an application of the rake dryer in the production of N-methylpyrrolidone is also proposed.

[0049] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0050] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. Rake dryer, characterized in that, Including: A heat-insulating cylinder body, in which a driving shaft (3) is rotatably installed; a plurality of deflecting plates (12) are provided and are rotatably connected to the driving shaft (3); a traction assembly is arranged in the driving shaft (3) and is connected to the deflecting plate (12), and the deflecting plate (12) has two deflecting states that can be switched by being pulled by the traction assembly; a directional air supply assembly is arranged on the driving shaft (3), and when the deflecting plate (12) raises the materials in the heat-insulating cylinder body, the directional air supply assembly can dry the materials; an arc plate (17) is attached to the directional air supply assembly, and the arc plate (17) can guide the gas to impact against the raised materials; a ring driving assembly is connected to the arc plate (17) and the traction assembly, and when the deflecting state of the deflecting plate (12) changes, the ring driving assembly can drive the arc plate (17) to act so as to change the flow direction of the gas in the heat-insulating cylinder body.

2. The rake dryer according to claim 1, characterized in that, The inside of the driving shaft (3) is of a hollow structure, and a pulling member (6) capable of moving along its length direction is arranged in the driving shaft (3). One end of the pulling member (6) penetrates through the end of the driving shaft (3) and is connected with a connecting plate (7), and the connecting plate (7) is connected with an electric telescopic rod (8) arranged on the heat-insulating cylinder body; a follower tube (4) is arranged on the driving shaft (3), the deflecting plate (12) is rotatably installed at one end of the follower tube (4) far from the driving shaft (3), and the rotating shaft of the deflecting plate (12) is connected with a connecting shaft (10) arranged in the follower tube (4), and the connecting shaft (10) and the pulling member (6) are connected through a fitting structure.

3. The rake dryer according to claim 2, wherein, The fitting structure includes a convex shaft (11) connected to one end of the connecting shaft (10) far from the deflecting plate (12), and the rotating shaft of the convex shaft (11) is offset from that of the connecting shaft (10); the fitting structure further includes a horizontal groove (9) arranged on the pulling member (6), and the convex shaft (11) can slide in the horizontal groove (9).

4. The rake dryer according to claim 2, characterized in that, The directional air supply assembly includes a first strip-shaped through groove (301) arranged on the driving shaft (3) and located between two adjacent follower tubes (4), an outer sleeve of the first strip-shaped through groove (301) is provided with a sleeve tube (16) fixedly connected with the heat-insulating cylinder body, and an arc-shaped through groove (1601) is arranged on the sleeve tube (16). The gas entering the driving shaft (3) can enter the heat-insulating cylinder body through the first strip-shaped through groove (301) and the arc-shaped through groove (1601).

5. The rake dryer according to claim 4, characterized in that, The arc-shaped plate (17) is symmetrically provided with a first guide through hole (18) and a second guide through hole (19). When the first guide through hole (18) or the second guide through hole (19) coincides with the arc-shaped through groove (1601), the first guide through hole (18) or the second guide through hole (19) can guide the directional injection of gas; the arc-shaped plate (17) is further provided with a guide groove, and the guide groove is matched with the annular driving assembly, so that the arc-shaped plate (17) can rotate relative to the sleeve pipe (16), and the first guide through hole (18) and the second guide through hole (19) can alternately coincide with the arc-shaped through groove (1601).

6. The rake dryer according to claim 5, characterized in that, The guide groove includes a spiral groove (21) arranged along the axial direction of the arc-shaped plate (17), and a straight groove (20) is arranged at each end of the spiral groove (21).

7. The rake dryer according to claim 5, characterized in that, The annular driving assembly includes a plurality of limiting members (13) connected to the pulling member (6). The limiting members (13) penetrate through the first strip-shaped through groove (301), and a collar (14) coaxial with the driving shaft (3) is slidably sleeved between the plurality of limiting members (13); a convex rod (15) is fixed on the collar (14), and the convex rod (15) can penetrate through a conduction groove (1602) arranged on the sleeve pipe (16) and extend into the guide groove.

8. The rake dryer according to claim 1, wherein, One end of the driving shaft (3) is provided with a plurality of second strip-shaped through grooves (302) at equal circumferential intervals, and a connecting head (5) is sealed and rotatably installed on the driving shaft (3). An annular cavity is formed between the connecting head (5) and the outer wall of the driving shaft (3), and the gas entering the connecting head (5) can enter the inside of the driving shaft (3) through the annular cavity and the second strip-shaped through groove (302).

9. Application of the rake dryer according to any one of claims 1 to 8 in the production of N-methylpyrrolidone.

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