Rake Dryer and Its Application in the Production of N-Methylpyrrolidone

Abstract

The present invention relates to the technical field of material drying, and in particular to a rake dryer and an application thereof in the production of N-methylpyrrolidone, comprising: a heat-insulating cylinder, in which a drive shaft is rotatably installed; a deflection plate, which is provided with multiple groups and is rotatably connected to the drive shaft; a traction assembly, which is arranged in the drive shaft and connected to the deflection plate, and the deflection plate has two deflection states that are switched by being pulled by the traction assembly; a directional air supply assembly, which is arranged on the drive shaft and can dry the material in the heat-insulating cylinder when the deflection plate lifts the material; a curved plate, which is attached to the directional air supply assembly and can guide the gas to collide with the lifted material; and an annular drive assembly, which is connected to the curved plate and the traction assembly and can drive the curved plate to move when the deflection state of the deflection plate changes, so as to change the flow direction of the gas in the heat-insulating cylinder and improve the drying effect.

Description

Technical Field

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

[0002] Recycling used batteries is a crucial task. Recycling used batteries can reduce environmental pollution and contribute to resource conservation and reuse. Recycling the chemical substances in used batteries allows for the secondary use of materials, reducing pollution from used batteries while increasing economic benefits.

[0003] In the material recycling of waste batteries, the recovery of N-methylpyrrolidone is also a common method. During the operation, the waste batteries need to be crushed first, and then dumped into a rake dryer, and the high temperature is used to evaporate the N-methylpyrrolidone and then collect it. This method has good economic benefits.

[0004] The rake dryer is provided with an inclined scraper, which can drive the waste battery particles to move while turning the waste battery particles horizontally in the rake dryer, so that the waste battery particles are heated evenly and prevent the waste battery particles from sticking to the rake dryer. However, since the inclination of the scraper is fixed, in order to make the waste battery particles roll back and forth, the drive motor needs to be driven forward and reverse. During this process, the scraper needs to stop rotating first and then accelerate to rotate at a predetermined speed, resulting in a large load on the drive motor. At the same time, there are intervals in the turning of the waste battery particles, which causes the sticking phenomenon with the rake dryer to occur again, affecting the overall drying speed. Summary of the Invention

[0005] The object 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 technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] Rake dryer, comprising:

[0008] A heat-insulating cylinder, wherein a drive shaft is rotatably mounted in the heat-insulating cylinder;

[0009] Deflection plates are provided in multiple groups and are rotatably connected to the drive shaft;

[0010] a traction assembly disposed in the drive shaft and connected to the deflection plate, the deflection plate having two deflection states switched by being pulled by the traction assembly;

[0011] a directional air supply assembly, disposed on the drive shaft, capable of drying the material when the deflector plate lifts the material in the heat-insulating cylinder;

[0012] An arc-shaped plate is attached to the directional air supply assembly, and the arc-shaped plate can guide the air to collide with the raised materials;

[0013] The annular driving assembly connects the arc plate and the traction assembly. When the deflection state of the deflection plate changes, the annular driving assembly can drive the arc plate to move so as to change the flow direction of the gas in the heat-insulating cylinder.

[0014] As a further solution of the present invention: the interior of the drive shaft is a hollow structure, and a pulling member capable of moving along the length direction of the drive shaft is provided in the drive shaft, one end of the pulling member passes through the end of the drive shaft and is connected to a connecting plate, and the connecting plate is connected to the electric telescopic rod provided on the heat-insulating cylinder;

[0015] The driving shaft is provided with a follower tube, the deflection plate is rotatably mounted on one end of the follower tube away from the driving shaft, and the rotating shaft of the deflection plate is connected to the connecting shaft provided in the follower tube, and the connecting shaft and the pulling member are connected via a chimeric structure.

[0016] As a further solution of the present invention: the interlocking structure includes a protruding shaft connected to an end of the connecting shaft away from the deflection plate, and the protruding shaft is offset from the rotating axis of the connecting shaft;

[0017] The interlocking structure further comprises a transverse groove provided on the pulling member, and the protruding shaft can slide in the transverse groove.

[0018] As a further solution of the present invention: the directional air supply component includes a first strip-shaped through groove arranged on the driving shaft and located between two adjacent groups of follower tubes, the outside of the first strip-shaped through groove is provided with a sleeve tube fixedly connected to the insulation cylinder, and the sleeve tube is provided with an arc-shaped through groove, and the gas entering the driving shaft can enter the insulation cylinder through the first strip-shaped through groove and the arc-shaped through groove.

[0019] As a further solution of the present invention: a first conducting hole and a second conducting hole are symmetrically provided on the arc-shaped plate, and when the first conducting hole or the second conducting hole coincides with the arc-shaped through groove, the first conducting hole or the second conducting hole can guide the gas to be ejected in a directional manner;

[0020] The arc plate is further provided with a guide groove, which cooperates with the annular driving assembly to enable the arc plate to rotate relative to the sleeve tube, so that the first conducting hole and the second conducting hole can alternately overlap with the arc groove.

[0021] As a further solution of the present invention: the guide groove includes a spiral groove arranged along the axial direction of the arc-shaped plate, and a straight groove is respectively provided at both ends of the spiral groove.

[0022] As a further solution of the present invention: the annular drive assembly includes multiple groups of limiting members connected to the pulling member, the limiting members pass through the first strip-shaped through-slot, and a ring coaxial with the drive shaft is slidably sleeved between the multiple groups of limiting members;

[0023] A convex rod is fixed on the collar, and the convex rod can pass through the conducting groove arranged on the sleeve pipe and extend into the guide groove.

[0024] As a further solution of the present invention: one end of the drive shaft is provided with multiple groups of second strip-shaped through grooves at equal intervals around the circumference, and a connector is sealed and rotatably mounted on the drive shaft, and an annular cavity is formed between the connector and the outer wall of the drive shaft, and the gas entering the connector can enter the interior of the drive shaft through the annular cavity and the second strip-shaped through grooves.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] By setting up the deflection plate and the traction assembly, compared with the existing rake-type dryer, the deflection of the deflection plate can be controlled by driving the traction member, so that the drive motor does not need to switch forward and reverse. At the same time, during the process of lifting and turning the material, the material itself 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 lift and make reverse lateral movement with a smaller load, thereby effectively reducing the load of the drive motor, allowing the material to continue to turn in the inner tank, and shortening the drying time to a certain extent.

[0027] By providing a directional air supply assembly, the dry high-temperature steam entering the drive shaft can be directed to be ejected under the guidance of the arc-shaped through groove, so that the dry high-temperature steam can evenly contact the material that is lifted up 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 multiple groups of first strip-shaped through grooves, so that when the dry high-temperature steam escapes from the arc-shaped through groove, it can be pressurized, thereby increasing the initial velocity of the dry high-temperature steam when it is ejected, and enabling the dry high-temperature steam to impact the material that is doing parabolic motion, thereby improving the drying effect of the material.

[0028] By providing the arc-shaped member, firstly, when the first conducting hole or the second conducting 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 can be generated in the inner container, thereby increasing the temperature inside the inner container and creating a higher temperature environment in the inner container. 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, thereby further improving the drying effect on the material.

[0029] By setting up the annular drive assembly, when the deflection state of the deflection plate changes, the first conductive hole or the second conductive hole overlapping with the arc-shaped through groove will also switch positions accordingly, thereby ensuring that when the deflection plate drives the material to turn over, the dry high-temperature steam can always move relative to the material, so that during the turning process of the material, it and the dry high-temperature steam are always in a state of relative movement and collision, further improving the drying effect of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of an embodiment of a rake dryer.

[0031] Figure 2 This is a schematic diagram of the internal structure of the heat-insulating cylinder in one embodiment of a rake dryer.

[0032] Figure 3 This is a schematic diagram of the structure of a rake dryer after the heat preservation cylinder is removed in one embodiment.

[0033] Figure 4 for Figure 3 Exploded diagram of the structure.

[0034] Figure 5 for Figure 3 Exploded view of the structure from another angle.

[0035] Figure 6 for Figure 5 A magnified view of the structure at point A.

[0036] Figure 7 This is a schematic diagram of the internal structure of the drive shaft in one embodiment of a rake dryer.

[0037] Figure 8 This is an exploded view of the structure of the traction assembly in one embodiment of a rake dryer.

[0038] Figure 9 This is an exploded view of the limiter, collar, and protruding rod structure in one embodiment of a rake dryer.

[0039] Figure 10 This is a schematic structural diagram of the curved plate in one embodiment of a rake dryer.

[0040] Figure 11 A side view of a curved plate in an embodiment of a rake dryer.

[0041] In the figure: 1. outer shell; 2. liner; 3. drive shaft; 301. first strip through groove; 302. second strip through groove; 4. follower tube; 5. connector; 6. pulling member; 7. connecting plate; 8. electric telescopic rod; 9. transverse groove; 10. connecting shaft; 11. convex shaft; 12. deflection plate; 13. limit member; 14. collar; 15. convex rod; 16. sleeve tube; 1601. arcuate through groove; 1602. conducting groove; 17. arcuate plate; 18. first conducting hole; 19. second conducting hole; 20. straight groove; 21. spiral groove. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0043] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0044] See also Figures 1 to 11 In an embodiment of the present invention, the rake dryer includes: a heat-insulating cylinder, a deflection plate 12, a traction assembly, a directional air supply assembly, an arc plate 17 and a ring drive assembly.

[0045] A drive shaft 3 is rotatably mounted in the heat-insulating cylinder. Furthermore, the heat-insulating cylinder 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 sets of interfaces are provided on the outer shell 1, and high-temperature steam can enter the sealed chamber through one set of structures and escape from the sealed chamber through the other set 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;

[0046] The deflection plates 12 are provided in multiple groups and are rotatably connected to the drive shaft 3 , wherein the rotating shaft of the drive shaft 3 is connected to the drive motor via a belt, and a certain gap is reserved between the end of the deflection plate 12 and the inner wall of the liner 2 .

[0047] 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 along the drive shaft 3 as the rotation center. At this time, when the deflection plate 12 acts on the material, it can drive the material to move in the inner liner 2. Specifically, the deflection plate 12 can drive the material to move in a circular motion along the inner wall of the inner liner 2. After 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 acts on the material to make the material be lifted up, so as to be dispersed in the inner liner 2 and fully contact with the high temperature in the inner liner 2, thereby achieving the drying effect of the material.

[0048] Furthermore, since the deflection plate 12 is in an inclined state when performing circular motion, the deflection plate 12 can cause the material to generate an oblique movement force when acting on the material, thereby causing the material to be lifted up and move along the length direction of the inner liner 2. At this time, the material has a tendency to roll horizontally in the inner liner 2, thereby further improving the drying effect of the material.

[0049] Through the above-mentioned arrangement, when the deflection plate 12 makes a circular motion, the material can be lifted up in a parabolic motion so as to fully contact the high temperature in the inner liner 2, and the material can also be moved laterally in the inner liner 2 and produce a lateral tumbling effect. The combination of the two can improve the drying effect of the material when it follows the movement of the deflection plate 12 to a certain extent.

[0050] See also Figure 4 、 Figure 7-Figure 8 The traction assembly is arranged in the drive shaft 3 and connected to the deflection plate 12, and the deflection plate 12 has two deflection states that are switched by being pulled by the traction assembly;

[0051] Specifically, the interior of the drive shaft 3 is a hollow structure, and a pulling member 6 capable of moving along its length is provided in the drive shaft 3. One end of the pulling member 6 passes through the end of the drive shaft 3 and is connected to a connecting plate 7. The connecting plate 7 is connected to an electric telescopic rod 8 provided on the heat-insulating cylinder.

[0052] The drive shaft 3 is provided with a follower tube 4, the deflection plate 12 is rotatably mounted on the end of the follower tube 4 away from the drive shaft 3, and the rotation axis of the deflection plate 12 is connected to the connecting shaft 10 provided in the follower tube 4, and the connecting shaft 10 and the pulling member 6 are connected via a chimeric structure, and the chimeric structure includes a protruding shaft 11 connected to the end of the connecting shaft 10 away from the deflection plate 12, and the protruding shaft 11 is staggered with the rotation axis of the connecting shaft 10;

[0053] The interlocking structure further includes a transverse groove 9 provided on the pulling member 6 , and the protruding shaft 11 can slide in the transverse groove 9 .

[0054] In the initial state, the electric telescopic rod 8 causes the pulling member 6 to be pulled outward through the connecting plate 7. At this time, the convex shaft 11 is in contact with one end of the horizontal slot 9, thereby ensuring the stability of the deflection state of the deflection plate 12 in this state. When it is necessary to deflect the deflection plate 12 in the opposite direction, the action end of the electric telescopic rod 8 is controlled to move in the opposite direction, so that the pulling member 6 moves in the opposite direction. At this time, the convex shaft 11 can slide in the horizontal slot 9, causing the connecting shaft 10 to rotate and drive 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 be lifted, but the material will roll in the opposite direction, that is, in the process of repeated switching of the deflection plate 12, the material can keep being lifted, and at the same time, the material can roll reciprocatingly in the inner liner 2, so that the material has a process of being stir-fried back and forth, further improving the drying effect, and in the process of the material rolling horizontally, it can effectively avoid the adhesion between the bottom material and the inner wall of the inner liner 2.

[0055] Furthermore, with respect to the existing rake-type dryer, a structure such as the deflection plate 12 is also provided inside the dryer, but the deflection direction of the deflection plate 12 is constant. At this time, in order to prevent the poor lateral rolling effect of the material from causing adhesion between the material at the bottom and the inner tank 2 and to improve the drying effect, it is necessary to drive the motor to drive the deflection plate 12 to make a circular motion for a predetermined time and then move in the reverse direction. Although this can also achieve the effect of the present embodiment, when the deflection plate 12 is making a circular motion and needs to switch the rotation direction, the deflection plate 12 needs to slow down to stop and then move in the reverse direction, resulting in the material needing to stop in the inner tank 2 and then follow the deflection plate 12 to move in the reverse direction, resulting in disadvantages. Yes, the driving motor needs to be stopped first and then drive the deflection plate 12 to accelerate from a standstill to a predetermined speed. The load generated is relatively high and the consumption of electric energy is also relatively large. However, in this embodiment, the deflection of the deflection plate 12 can be controlled only by driving the pulling member 6, and the driving motor does not have the action of switching between forward and reverse rotations. At the same time, in the process of lifting and turning the material, the material itself also has a certain inertia. Although the direction of the lateral rolling of the material has changed, the deflection plate 12 can still drive the material to be lifted and to make a reverse lateral movement with a smaller load, thereby effectively reducing the load of the driving motor and allowing the material to continue to turn over in the inner tank 2, which also shortens the drying time to a certain extent.

[0056] See also Figures 3 to 5 One end of the drive shaft 3 is provided with a plurality of groups of second strip-shaped through grooves 302 at equal intervals around the circumference, and a connector 5 is sealed and rotatably mounted on the drive shaft 3. An annular cavity is formed between the connector 5 and the outer wall of the drive shaft 3. Gas entering the connector 5 can enter the interior of the drive shaft 3 through the annular cavity and the second strip-shaped through grooves 302;

[0057] The directional air supply component is arranged on the driving shaft 3, and the directional air supply component can dry the material when the deflection plate 12 lifts the material in the heat preservation cylinder;

[0058] The directional air supply component includes a first strip-shaped through groove 301 arranged on the driving shaft 3 and located between two adjacent groups of follower tubes 4. The outside of the first strip-shaped through groove 301 is provided with a sleeve pipe 16 fixedly connected to the insulation cylinder. The sleeve pipe 16 is provided with an arc-shaped through groove 1601. The gas entering the driving shaft 3 can enter the insulation cylinder through the first strip-shaped through groove 301 and the arc-shaped through groove 1601.

[0059] During use, an external pumping device (not shown in the figure) can pressurize the dry high-temperature steam and pass it into the connecting head 5. At this time, the high-temperature steam can enter the drive shaft 3 through the annular cavity and the second strip 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 interior of the drive shaft 3, it can escape through the second strip groove 302 and, under the guidance of the arc groove 1601, the dry high-temperature steam can be sprayed out in a direction, so that the dry high-temperature steam can evenly contact the material that is lifted up by the parabolic motion, further improving the drying effect of the material.

[0060] It should be noted that, since the sleeve tube 16 is sleeved on the outside of the first strip groove 301, the high-temperature steam escaping from the first strip groove 301 can be collected in the arc-shaped groove 1601. Obviously, the opening of the arc-shaped groove 1601 is smaller than the openings of multiple groups of first strip grooves 301, so that when the dry high-temperature steam escapes from the arc-shaped groove 1601, it can be pressurized, thereby increasing the initial velocity of the dry high-temperature steam when it is ejected, and enabling the dry high-temperature steam to impact the material doing parabolic motion, thereby improving the drying effect on the material.

[0061] It should also be noted that since the direction of the circular motion of the deflection plate 12 is constant, even if the deflection state of the deflection plate 12 changes, the direction of the material flipping is constant. Therefore, when the lateral rolling direction of the material changes, the dry high-temperature steam escaping from the arc-shaped groove 1601 can effectively act on the material to ensure the drying effect of the material.

[0062] See also Figures 3 to 6 、 Figure 10-11The arc-shaped plate 17 is attached to the directional air supply assembly. The arc-shaped plate 17 can guide the gas to collide with the raised materials. The arc-shaped 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-shaped through groove 1601, the first conductive hole 18 or the second conductive hole 19 can guide the gas to be ejected in a directional manner.

[0063] 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.

[0064] In the initial state, only the first conductive hole 18 or the second conductive hole 19 overlaps with the arc-shaped groove 1601. At this time, the dry high-temperature steam escaping from the arc-shaped groove 1601 can escape through 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 obliquely upward. At this time, after the dry high-temperature steam collides with the material, it can also collide with the inner wall of the inner container 2 and generate counterclockwise air flow (see Figure 11 ), and at the same time, the first conducting hole 18 and the second conducting hole 19 are respectively inclined to the two ends of the arc-shaped 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 tank 2, generating a spiral airflow so that the temperature in the inner tank 2 can rise again to create a higher high-temperature environment, and at the same time can offset the material raised by the deflection plate 12. Specifically, when the material is rolled horizontally 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 has 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.

[0065] 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 liner 2 to increase the temperature inside the inner liner 2, so that a higher high-temperature environment can be created in the inner liner 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, thereby further improving the drying effect on the material.

[0066] See also Figures 4 to 7 、 Figure 9The arc-shaped plate 17 is further provided with a guide groove, which cooperates with the annular drive assembly to enable the arc-shaped 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-shaped through groove 1601;

[0067] 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 provided at each end of the spiral groove 21;

[0068] The annular drive assembly is connected to the arc plate 17 and the traction assembly. When the deflection state of the deflection plate 12 changes, the annular drive assembly can drive the arc plate 17 to move, so as to change the flow direction of the gas in the heat preservation cylinder;

[0069] The annular drive assembly includes multiple groups of limit members 13 connected to the pulling member 6. The limit members 13 pass through the first strip-shaped through slot 301. A collar 14 coaxial with the drive shaft 3 is slidably sleeved between the multiple groups of limit members 13.

[0070] A protruding rod 15 is fixed on the collar 14 , and the protruding rod 15 can pass through the conducting groove 1602 provided on the sleeve tube 16 and extend into the guide groove.

[0071] During use, since the drive shaft 3 is in a rotating state, the pulling member 6 can follow the drive shaft 3 to make a circular motion, and the limit member 13 will also make a circular motion, and the ring 14 is slidably set on the limit member 13, and the protruding rod 15 slides in the guide groove 1602, so that when the drive shaft 3 rotates, the limit member 13 can rotate relative to the ring 14, and at this time the protruding rod 15 is restricted in the straight groove 20, so that the arc plate 17 can maintain an axial locking state with the sleeve tube 16, so as to improve the stability of the first guide hole 18 or the second guide hole 19 when it overlaps with the arc groove 1601.

[0072] When the pulling member 6 is actuated to switch the deflection state of the deflection plate 12, the limit member 13 will also drive the collar 14 to move along the length direction of the drive shaft 3. At this time, the collar 14 drives the protruding rod 15 to move along the length direction of the conducting groove 1602, and causes the protruding rod 15 to move toward the spiral groove 21. During this process, the protruding rod 15 can cooperate with the spiral groove 21, so that the arc plate 17 rotates relative to the sleeve tube 16, so that the first conducting hole 18 or the second conducting hole 19 overlapping with the arc through groove 1601 switches position, so that when the deflection state of the deflection plate 12 changes, the first conducting hole 18 or the second conducting hole 19 overlapping with the arc through groove 1601 switches position accordingly, so that when the deflection state of the deflection plate 12 drives the material to turn over, the dry high-temperature steam can always move relative to the material.

[0073] Through the above arrangement, when the deflection state of the deflection plate 12 changes, the first conductive hole 18 or the second conductive hole 19 that coincides with the arc-shaped through groove 1601 will also switch positions accordingly, thereby ensuring that when the deflection plate 12 drives the material to turn, the dry high-temperature steam can always move relative to the material. In this way, during the turning process of the material, the material and the dry high-temperature steam are always in a state of relative motion and collision, thereby further improving the drying effect of the material.

[0074] As an embodiment of the present invention, the application of the rake dryer in the production of N-methylpyrrolidone is also proposed.

[0075] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0076] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. Rake dryer, characterized in that, include: A heat-insulating cylinder, wherein a drive shaft (3) is rotatably mounted in the heat-insulating cylinder; Deflection plates (12) are provided in multiple groups and are rotationally connected to the drive shaft (3); A traction assembly is arranged in the drive shaft (3) and connected to the deflection plate (12), the deflection plate (12) having two deflection states that are switched by being pulled by the traction assembly; a directional air supply component, arranged on the drive shaft (3), capable of drying the material when the deflection plate (12) lifts the material in the heat-insulating cylinder; An arc-shaped plate (17) is attached to the directional air supply assembly, and the arc-shaped plate (17) can guide the gas to collide with the raised materials; an annular drive assembly connected to the arc plate (17) and the traction assembly, wherein the annular drive assembly is capable of driving the arc plate (17) to move when the deflection state of the deflection plate (12) changes, thereby changing the flow direction of the gas in the heat-insulating cylinder; The interior of the drive shaft (3) is a hollow structure, and a pulling member (6) capable of moving along the length direction thereof is provided in the drive shaft (3), one end of the pulling member (6) passes through the end of the drive shaft (3) and is connected to a connecting plate (7), the connecting plate (7) is connected to an electric telescopic rod (8) provided on the heat-insulating cylinder, and a follower tube (4) is provided on the drive shaft (3); The directional air supply component comprises a first strip-shaped through groove (301) provided on the driving shaft (3) and located between two adjacent groups of follower tubes (4); a sleeve tube (16) fixedly connected to the heat-insulating cylinder is sleeved on the outside of the first strip-shaped through groove (301); an arc-shaped through groove (1601) is provided on the sleeve tube (16); and gas entering the driving shaft (3) can enter the heat-insulating cylinder through the first strip-shaped through groove (301) and the arc-shaped through groove (1601); A first conducting hole (18) and a second conducting hole (19) are symmetrically provided on the arc-shaped plate (17); when the first conducting hole (18) or the second conducting hole (19) coincides with the arc-shaped through groove (1601), the first conducting hole (18) or the second conducting hole (19) can guide the gas to be ejected in a directional manner; The arc-shaped plate (17) is further provided with a guide groove, and the guide groove cooperates with the annular drive assembly to enable the arc-shaped 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-shaped through groove (1601); The annular drive assembly comprises a plurality of groups of limiting members (13) connected to the pulling member (6), the limiting members (13) passing through the first strip-shaped through slot (301), and a collar (14) coaxial with the drive shaft (3) is slidably sleeved between the plurality of groups of limiting members (13); A protruding rod (15) is fixed on the collar (14), and the protruding rod (15) is capable of passing through a conducting groove (1602) provided on the sleeve tube (16) and extending into the guide groove.

2. The rake dryer according to claim 1, characterized in that The deflection plate (12) is rotatably mounted on an end of the follower tube (4) away from the drive shaft (3), and the rotation axis of the deflection plate (12) is connected to a connecting shaft (10) provided in the follower tube (4), and the connecting shaft (10) and the pulling member (6) are connected via a chimeric structure.

3. The rake dryer according to claim 2, characterized in that The interlocking structure comprises a protruding shaft (11) connected to an end of the connecting shaft (10) away from the deflection plate (12), wherein the protruding shaft (11) is misaligned with the rotation axis of the connecting shaft (10); The interlocking structure further comprises a transverse groove (9) provided on the pulling member (6), and the protruding shaft (11) is capable of sliding in the transverse groove (9).

4. The rake dryer according to claim 1, characterized in that The guide groove comprises a spiral groove (21) arranged along the axial direction of the arc-shaped plate (17), and a straight groove (20) is respectively provided at both ends of the spiral groove (21).

5. The rake dryer according to claim 1, characterized in that One end of the drive shaft (3) is provided with a plurality of groups of second strip-shaped through grooves (302) at equal intervals around the circumference, and a connector (5) is rotatably mounted on the drive shaft (3) in a sealed manner, an annular cavity is formed between the connector (5) and the outer wall of the drive shaft (3), and gas entering the connector (5) can enter the interior of the drive shaft (3) through the annular cavity and the second strip-shaped through grooves (302).

6. Use of the rake dryer according to any one of claims 1 to 5 in the production of N-methylpyrrolidone.

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