A multi-stage steam drying device for the drying section and its process

Abstract

This invention provides a multi-stage steam drying device and its process for a drying section, relating to the field of kraft paper production. It includes a steam distribution assembly composed of opening / closing trigger blocks and a pipeline mechanism. A spacing control component can change the usage positions of the four opening / closing trigger blocks. The pipeline mechanism is in a closed state when in the reset state (the opening / closing plunger is not subjected to external force). Only the pipeline mechanism located at the opening / closing trigger block position will open. Thus, changing the usage position of the four opening / closing trigger blocks changes the opening / closing state of the corresponding pipeline mechanism. Furthermore, the spacing between the effectively opened pipeline mechanisms remains the same, resulting in uniform drying of the kraft paper. The effective usable length of the steam channel can be freely adjusted, solving the problem that the usage position and spacing of the drying nozzles in existing drying devices are always fixed and cannot be adjusted, which leads to an inability to adjust the maximum drying length.

Description

Technical Field

[0001] This invention relates to the field of kraft paper production technology, and in particular to a multi-stage steam drying device and its process in the drying section. Background Technology

[0002] Kraft paper is one of the main types of paper used in cardboard boxes. During production, kraft paper requires a drying process. Specifically, the kraft paper is conveyed by a conveyor and passes through the bottom of the drying section. High-temperature steam sprayed from the drying section dries the kraft paper, facilitating subsequent processing. For example, patent application number CN202010743532.X discloses a kraft paper drying device, including a support frame, a U-shaped support plate, a U-shaped sleeve cover, a conveyor roller, double-row sprockets, a chain, a conveyor motor, a distribution box, a drying cloth, an assembly head, horizontal pipes, vertical pipes, a steam outlet, an installation box, a first heating pipe, a fan, a PLC, a drive switch, a clamping and leveling rod frame structure, a rectangular plate, a rotating water suction cylinder structure, an auxiliary water suction pipe tank structure, and a U-shaped plate frame. The support frame is welded around the lower end of the U-shaped support plate; the U-shaped sleeve cover is welded to the right side of the upper end of the U-shaped support plate; and the conveyor roller is mounted on the inner wall of the U-shaped sleeve cover via bearings. The beneficial effects of this invention are as follows: by setting up a clamping and leveling rod frame structure, the kraft paper can be squeezed by leveling cylinders at different positions during use, thereby achieving the leveling work and increasing functionality.

[0003] However, the current drying equipment used in kraft paper production has fixed positions and spacing of drying nozzles that cannot be adjusted. This results in the inability to adjust the maximum drying length. When drying narrower kraft paper, the steam emitted from the outer drying nozzles is not effectively utilized, leading to poor flexibility and low practicality. Summary of the Invention

[0004] This disclosure relates to a multi-stage steam drying device and its process in the drying section. It has a spacing control component and a steam distribution component. The spacing control component can change the usage position of four opening and closing trigger blocks. When the pipeline mechanism is in the reset state (the opening and closing plunger is not squeezed by external force), it is in the closed state. Only the pipeline mechanism located at the position of the opening and closing trigger block will be opened. Thus, changing the usage position of the four opening and closing trigger blocks changes the opening and closing state of the pipeline mechanism at the corresponding position. The spacing between the effectively opened pipeline mechanisms is always the same, resulting in a uniform drying effect on kraft paper. The effective usable length of the steam channel can be freely adjusted, thus adapting to the drying operation of kraft paper of different widths. It has high steam utilization rate and is highly flexible, adaptable, and practical.

[0005] The first aspect of this disclosure provides a multi-stage steam drying device and its process for a drying section, specifically including: a support assembly, the support assembly including a support frame, a functional frame, an adjusting rod, and a sealing plate, the functional frame being fixedly installed inside the support frame, and the adjusting rod being rotatably connected inside the functional frame, and the sealing plate being inserted into the functional frame; a spacing control assembly, the spacing control assembly including a spacing telescopic frame, a control rod, and two positioning seats, the two positioning seats being rotatably connected to the tops of two connecting shafts in the middle of the spacing telescopic frame, and the control rod being rotatably connected to the top of the support frame, and the control rod being inserted into the two positioning seats; and a steam distribution assembly, the steam distribution assembly consisting of an opening / closing trigger block and a pipeline mechanism, the opening / closing trigger block being inserted into the functional frame, and the top of the opening / closing trigger block being rotatably connected to the rotating shaft of the spacing telescopic frame;

[0006] The piping mechanism includes a fixed seat, an opening and closing plunger, and a drying nozzle. The fixed seat is fixedly installed inside the functional frame, and the opening and closing plunger is inserted into the fixed seat. The drying nozzle is fixedly installed inside the fixed seat.

[0007] The pipe mechanism is provided at the bottom of the functional frame, and the pipe mechanism is arranged in a straight line at the bottom of the functional frame.

[0008] In at least some embodiments, the functional frame has a steam channel inside and a steam inlet channel on the back side of the functional frame. One end of the steam inlet channel is connected to the steam channel, and the other end of the steam inlet channel is connected to a steam generator through a pipe.

[0009] In at least some embodiments, the adjusting rod has threads on its outer surface, and the adjusting rod is screwed into the inside of the sealing disc via the rod threads. There are two sealing discs, and the two sealing discs are symmetrically arranged on both sides inside the steam channel.

[0010] In at least some embodiments, the cross-section of the sealing disc is a regular polygon, and the two sealing discs can move synchronously in opposite directions when the adjusting rod is rotated.

[0011] In at least some embodiments, the control rod has threads on the outside of its body, and the control rod is screwed into the interior of two positioning seats through threads on both sides of the rod body. When the control rod rotates, it can drive the spacing telescopic frame to perform telescopic movements.

[0012] In at least some embodiments, the opening and closing plunger is provided with a sealing top spring inside, and the two ends of the sealing top spring abut against the inside of the opening and closing plunger and the inside of the fixing seat, respectively.

[0013] In at least some embodiments, the fixed seat has a steam distribution channel inside, and the opening and closing plunger has an opening and closing channel inside. Under the action of the sealing top spring, when the opening and closing plunger is not squeezed by external force, the steam distribution channel and the opening and closing channel are misaligned with each other.

[0014] In at least some embodiments, there are four opening and closing trigger blocks, and the four opening and closing trigger blocks are equally spaced. The bottom of the opening and closing trigger block is provided with a sliding abutment block, and the outside of the opening and closing plunger is provided with a passive block. The two ends of the opposite side of the sliding abutment block and the passive block are both designed with inclined chamfers, and the length of the sliding abutment block is greater than the distance between two adjacent passive blocks. The passive block is located on the movement trajectory of the sliding abutment block.

[0015] In at least some embodiments, the opening and closing plunger is provided with a track block on its outside and a track groove is provided inside the fixing seat, and the track block is inserted into the track groove.

[0016] The multi-stage steam drying device and process of the drying section provided by the present invention have the following beneficial effects.

[0017] The device includes a spacing control component and a steam distribution component. The spacing control component can change the position of four opening and closing trigger blocks. When the pipeline mechanism is in the reset state (the opening and closing plunger is not squeezed by external force), it is in the closed state. Only the pipeline mechanism located at the position of the opening and closing trigger block will be opened. Thus, changing the position of the four opening and closing trigger blocks changes the opening and closing state of the pipeline mechanism at the corresponding position. The spacing between the effectively opened pipeline mechanisms is always the same, resulting in uniform drying effect on kraft paper. The effective length of the steam channel can be freely adjusted, thus adapting to the drying operation of kraft paper of different widths. The steam utilization rate is high, improving the flexibility, adaptability and practicality of the device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0019] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0020] In the attached diagram:

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is the present invention. Figure 1 A schematic diagram of the structure on the dorsal side.

[0023] Figure 3 This is a schematic diagram of the internal structure of the present invention.

[0024] Figure 4 This is the present invention. Figure 3 Enlarged structural diagram of part A in the middle.

[0025] Figure 5 This is the present invention. Figure 3Enlarged structural diagram of part B in the middle.

[0026] Figure 6 This is the present invention. Figure 3 Enlarged structural diagram of part C in the middle.

[0027] Figure 7 This is a structural diagram of the disassembled support assembly and spacing control assembly of the present invention.

[0028] Figure 8 This is a structural diagram of the disassembled opening / closing trigger block and pipeline mechanism of the present invention.

[0029] Figure 9 This is a schematic diagram of the internal structure of the pipe mechanism in the reset state of the present invention.

[0030] List of reference numerals

[0031] 1. Bracket assembly; 101. Support frame; 102. Functional frame; 1021. Steam passage; 1022. Steam inlet passage; 103. Adjusting rod; 104. Sealing plate;

[0032] 2. Spacing control assembly; 201. Spacing telescopic frame; 202. Positioning seat; 203. Control rod;

[0033] 3. Open / close trigger block; 301. Sliding resist block;

[0034] 4. Piping mechanism; 401. Fixed seat; 4011. Steam distribution channel; 4012. Track groove; 402. Opening and closing plunger; 4021. Sealing top spring; 4022. Opening and closing channel; 4023. Passive block; 4024. Track block; 403. Drying nozzle. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please refer to Figures 1 to 9 As shown:

[0037] Example 1: This invention provides a multi-stage steam drying device and its process for a drying section, including a support assembly 1, which includes a support frame 101, a functional frame 102, an adjusting rod 103, and a sealing plate 104. The functional frame 102 is fixedly installed inside the support frame 101, and the adjusting rod 103 is rotatably connected inside the functional frame 102. The sealing plate 104 is inserted into the functional frame 102. A spacing control assembly 2 includes a spacing telescopic frame 201, a control rod 203, and two positioning seats 202. The two positioning seats 202 are rotatably connected to the tops of two connecting shafts in the middle of the spacing telescopic frame 201, and the control rod 203 is rotatably connected to the top of the support frame 101 and inserted into the two positioning seats 202. A steam distribution assembly consists of an opening / closing trigger block 3 and a pipe mechanism 4. The opening / closing trigger block 3 is inserted into the functional frame 102, and the top of the opening / closing trigger block 3 is rotatably connected to the inside of the rotating shaft of the spacing telescopic frame 201.

[0038] The pipeline mechanism 4 includes a fixed seat 401, an opening and closing plunger 402, and a drying nozzle 403. The fixed seat 401 is fixedly installed inside the functional frame 102, and the opening and closing plunger 402 is inserted into the fixed seat 401. The drying nozzle 403 is fixedly installed inside the fixed seat 401.

[0039] Several pipe mechanisms 4 are provided at the bottom of the functional frame 102, and the pipe mechanisms 4 are arranged in a straight line at the bottom of the functional frame 102.

[0040] In this embodiment, the functional frame 102 has a steam channel 1021 inside and a steam inlet channel 1022 on the back side. One end of the steam inlet channel 1022 is connected to the steam channel 1021, and the other end of the steam inlet channel 1022 is connected to a steam generator through a pipe. In use, the support assembly 1 can change the effective steam supply length inside the functional frame 102, thereby realizing the function of regulating the effective drying length. The steam emitted by the steam generator enters the interior of the steam channel 1021 through the steam inlet channel 1022. The steam is finally sprayed out through the pipe mechanism 4 in the open state to achieve the drying operation of the passing kraft paper. The effective length of the steam channel 1021 can be changed by adjusting the rod 103, that is, the effective steam supply length inside the functional frame 102 is changed. The rod body of the adjusting rod 103 is threaded on the outside, and The adjusting rod 103 is screwed into the inside of the sealing disc 104 via a threaded rod body. There are two sealing discs 104, which are symmetrically arranged on both sides inside the steam channel 1021. The cross-section of the sealing disc 104 is a regular polygon. When the adjusting rod 103 rotates, the two sealing discs 104 can move synchronously in opposite directions. When the adjusting rod 103 rotates, it can drive the two sealing discs 104 to move synchronously in opposite directions via the threaded rod body, thereby changing the distance between the two sealing discs 104. Only the steam channel 1021 within this distance will receive steam supply, while the steam channel 1021 located outside the space of the sealing disc 104 will not receive steam supply because it is blocked by the sealing disc 104. This controls the effective length of the steam channel 1021, which can adapt to the drying and drying operations of kraft paper of different widths, and has extremely high flexibility and adaptability.

[0041] In this embodiment, the control rod 203 has threads on its outer surface, and the control rod 203 is screwed into the interior of the two positioning seats 202 through the threads on both sides of the rod. When the control rod 203 rotates, it can drive the spacing telescopic frame 201 to extend and retract. In use, the spacing control component 2 can adjust the position of the four opening and closing trigger blocks 3. The change of the position of the opening and closing trigger blocks 3 changes the opening and closing state of the corresponding pipe mechanism 4, thereby realizing the function of adjusting the drying spacing. When the control rod 203 is rotated, the control rod 203 can drive the two positioning seats 202 to move through the rod threads. When the two positioning seats 202 move, they can drive the spacing telescopic frame 201 to extend and retract. When the spacing telescopic frame 201 extends and retracts, it can drive the opening and closing trigger blocks 3 to move synchronously, thereby changing the position of the opening and closing trigger blocks 3. Due to the structural characteristics of the spacing telescopic frame 201, the spacing between the four opening and closing trigger blocks 3 is always the same, ensuring that the drying process of the kraft paper is uniform.

[0042] In this embodiment, the opening / closing plunger 402 is provided with a sealing top spring 4021 inside, and the two ends of the sealing top spring 4021 abut against the inside of the opening / closing plunger 402 and the inside of the fixed seat 401, respectively. The fixed seat 401 is provided with a steam distribution channel 4011 inside, and the opening / closing plunger 402 is provided with an opening / closing channel 4022 inside. Under the action of the sealing top spring 4021, when the opening / closing plunger 402 is not squeezed by external force, the steam distribution channel 4011 and the opening / closing channel 4022 are misaligned with each other. In use, the pipeline mechanism 4 is in the closed state when in the reset state. At this time, the outside of the pipeline mechanism 4 is not squeezed by the opening / closing trigger block 3, so the opening / closing plunger 402 is in the pushed-out state under the action of the sealing top spring 4021, and at this time the steam distribution channel 4011 and the opening / closing channel 4022 are misaligned with each other. The steam inside the steam passage 1021 is not discharged through the pipe mechanism 4 in the reset state, but is discharged from the pipe mechanism 4 at the position of the opening and closing trigger block 3 to achieve the drying operation. The passive block 4023 of the pipe mechanism 4 at the position of the opening and closing trigger block 3 is squeezed by the sliding abutment block 301, so that the opening and closing plunger 402 is pushed into the interior of the fixed seat 401. At this time, the steam distribution passage 4011 and the opening and closing passage 4022 overlap, so the steam inside the steam passage 1021 will enter the drying nozzle 403 through the steam distribution passage 4011 and the opening and closing passage 4022 in sequence and be dispersed and sprayed out, acting on the kraft paper passing at the bottom for drying. Since there are four sliding abutment blocks 301, at least four sets of pipe mechanisms 4 will be opened simultaneously each time, resulting in good drying effect and comprehensive treatment.

[0043] In this embodiment, four opening / closing trigger blocks 3 are provided, and the four opening / closing trigger blocks 3 are equally spaced. A sliding contact block 301 is provided at the bottom of each opening / closing trigger block 3, and a passive block 4023 is provided outside the opening / closing plunger 402. Both ends of the sliding contact block 301 and the passive block 4023 on opposite sides are designed with inclined chamfers. The length of the sliding contact block 301 is greater than the distance between two adjacent passive blocks 4023. The passive block 4023 is located on the movement trajectory of the sliding contact block 301. In use, the spacing control component 2 can adjust the position of the four opening / closing trigger blocks 3. The change in position alters the opening and closing state of the corresponding pipe mechanism 4, thereby enabling the adjustment of the drying spacing. When the control lever 203 is rotated, the control lever 203 can drive the two positioning seats 202 to move through the screw thread. When the two positioning seats 202 move, they can drive the spacing telescopic frame 201 to extend and retract. When the spacing telescopic frame 201 extends and retracts, it can drive the opening and closing trigger block 3 to move synchronously, thereby changing the usage position of the opening and closing trigger block 3. Due to the structural characteristics of the spacing telescopic frame 201, the spacing between the four opening and closing trigger blocks 3 is always the same, ensuring uniform drying of the kraft paper.

[0044] The specific usage and function of this embodiment: In this invention, during the conveying process of kraft paper through the conveying device, the kraft paper passes through the inside of the support frame 101. During the process of passing through the support frame 101, the kraft paper is dried. The support assembly 1 can change the effective steam supply length inside the functional frame 102, thereby realizing the function of controlling the effective drying length. The steam generated by the steam generator enters the inside of the steam channel 1021 through the steam inlet channel 1022. The steam is finally sprayed out through the open pipe mechanism 4 to realize the drying operation of the passing kraft paper. The effective length of the steam channel 1021 can be changed by the adjusting rod 103, that is, the effective steam supply length inside the functional frame 102 can be changed. When the adjusting rod 103 rotates, it drives the two sealing discs 104 to move synchronously and in opposite directions through the thread of the rod body, thereby changing the distance between the two sealing discs 104. Only the steam passage 1021 within this distance will receive steam supply, while the steam passage 1021 located in the space outside the sealing disc 104 will not receive steam supply because it is blocked by the sealing disc 104. This controls the effective length of the steam passage 1021, which can adapt to the drying and drying operations of kraft paper of different widths. When the pipeline mechanism 4 is in the reset state, it is in the closed state. At this time, the outside of the pipeline mechanism 4 is not squeezed by the opening and closing trigger block 3, so the opening and closing plunger 402 is in the pushed-out state under the action of the sealing top spring 4021. At this time, the steam distribution channel 4 The steam distribution channel 4011 and the opening / closing channel 4022 are misaligned, so the steam inside the steam channel 1021 will not be discharged through the pipe mechanism 4 in the reset state, but will be discharged from the pipe mechanism 4 at the position of the opening / closing trigger block 3 to achieve the drying operation. The passive block 4023 of the pipe mechanism 4 at the position of the opening / closing trigger block 3 will be squeezed by the sliding abutment block 301, so that the opening / closing plunger 402 is pushed into the interior of the fixed seat 401. At this time, the steam distribution channel 4011 and the opening / closing channel 4022 overlap, so the steam inside the steam channel 1021 will enter the drying nozzle 403 through the steam distribution channel 4011 and the opening / closing channel 4022 in sequence and be dispersed and sprayed out, acting on the kraft paper passing at the bottom for drying. Furthermore, since there are four sliding contact blocks 301, at least four sets of pipe mechanisms 4 will open simultaneously each time, resulting in good drying and drying effects. The spacing control component 2 can adjust the usage position of the four opening and closing trigger blocks 3. Changing the usage position of the opening and closing trigger blocks 3 changes the opening and closing state of the corresponding pipe mechanism 4, thereby realizing the function of adjusting the drying spacing. When the control rod 203 is rotated, the control rod 203 can drive the two positioning seats 202 to move through the rod thread. When the two positioning seats 202 move, they can drive the spacing telescopic frame 201 to extend and retract. When the spacing telescopic frame 201 extends and retracts, it can drive the opening and closing trigger blocks 3 to move synchronously, thereby changing the usage position of the opening and closing trigger blocks 3. And due to the structural characteristics of the spacing telescopic frame 201...The spacing between the four opening / closing trigger blocks 3 remains constant, ensuring uniform drying of the kraft paper. When the opening / closing trigger block 3 moves, it first releases the resistance and compression of the passive block 4023 of the original position's pipe mechanism 4. Consequently, the pipe mechanism 4 at that position automatically closes under the action of the sealing spring 4021. Furthermore, as the opening / closing trigger block 3 moves, the passive block 4023 of the pipe mechanism 4 in its moving direction is automatically opened by the sliding contact block 301. Therefore, when the opening / closing trigger block 3 moves to the desired position, only the pipe mechanism 4 at that position will be open, enabling the drying of the kraft paper.

[0045] In another embodiment, the opening and closing plunger 402 is provided with a track block 4024 on the outside and a track groove 4012 is provided inside the fixing seat 401. The track block 4024 is inserted into the track groove 4012. The track block 4024 can restrict the movement trajectory of the opening and closing plunger 402 through the track groove 4012, so that the opening and closing plunger 402 will not be skewed or twisted when moving, which would cause the device to jam and fail, thus improving the stability of the device.

[0046] The following points should be noted in this article:

[0047] 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0048] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0049] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A multi-stage through-air drying apparatus for a drying section, characterized by, Include: Support assembly (1), the support assembly (1) includes support frame (101), functional frame (102), adjusting rod (103) and sealing disc (104), the functional frame (102) is fixedly installed in the inside of support frame (101), and adjusting rod (103) is rotatably connected in the inside of functional frame (102), sealing disc (104) is inserted in the inside of functional frame (102);Spacing control assembly (2), the spacing control assembly (2) includes spacing telescopic frame (201), control rod (203) and two positioning seats (202), the two positioning seats (202) are rotatably connected at the top of two connecting shafts in the middle of spacing telescopic frame (201) frame body respectively, and control rod (203) is rotatably connected at the top of support frame (101), control rod (203) is inserted in the inside of two positioning seats (202);Steam distribution assembly, the steam distribution assembly is composed of opening and closing trigger block (3) and pipeline mechanism (4), the opening and closing trigger block (3) is inserted in the inside of functional frame (102), and the top of opening and closing trigger block (3) is rotatably connected in the inside of the rotating shaft of spacing telescopic frame (201); The pipeline mechanism (4) includes fixed seat (401), opening and closing plunger (402) and drying nozzle (403), the fixed seat (401) is fixedly installed in the inside of functional frame (102), and the opening and closing plunger (402) is inserted in the inside of fixed seat (401), the drying nozzle (403) is fixedly installed in the inside of fixed seat (401); The pipeline mechanism (4) is provided with several on the bottom of functional frame (102), and several pipeline mechanisms (4) are arranged in a straight line on the bottom of functional frame (102); The rod body outside of control rod (203) is provided with screw threads, and control rod (203) is inserted in the inside of two positioning seats (202) through the screw threads of two side rod bodies respectively, control rod (203) can drive spacing telescopic frame (201) to make telescopic action when rotating; The inside of opening and closing plunger (402) is provided with sealing top spring (4021), and the two ends of sealing top spring (4021) are respectively abutted against the inside of opening and closing plunger (402) and the inside of fixed seat (401); The inside of fixed seat (401) is provided with steam distribution channel (4011), and the inside of opening and closing plunger (402) is provided with opening and closing channel (4022), under the action of sealing top spring (4021), when opening and closing plunger (402) is not extruded by external force, steam distribution channel (4011) and opening and closing channel (4022) are mutually misaligned; The four opening and closing trigger blocks (3) are equidistantly arranged, the bottom of the opening and closing trigger block (3) is provided with a sliding contact block (301), and the outside of the opening and closing plunger (402) is provided with a passive block (4023). The two ends of the opposite sides of the sliding contact block (301) and the passive block (4023) are designed as inclined chamfers, and the length of the block body of the sliding contact block (301) is greater than the interval of the two adjacent passive blocks (4023). The passive block (4023) is located on the movement track of the sliding contact block (301).

2. The multi-stage drying device according to claim 1, wherein: The inside of the function frame (102) is provided with a steam channel (1021), and the back side of the function frame (102) is provided with an inlet steam channel (1022). One end of the inlet steam channel (1022) is communicated with the steam channel (1021), and the other end of the inlet steam channel (1022) is connected with the steam generator through a pipeline.

3. The multi-stage drying device according to claim 2, wherein: The rod body of the adjusting rod (103) is externally provided with threads, and the adjusting rod (103) is screwed in the inside of the plugging disc (104) through the rod body threads. The plugging disc (104) is provided with two, and the two plugging discs (104) are symmetrically arranged on both sides of the inside of the steam channel (1021).

4. The multi-stage drying device according to claim 3, wherein: The disc body cross section of the plugging disc (104) is a regular polygon. When the adjusting rod (103) rotates, the two plugging discs (104) can move synchronously and in opposite directions.

5. The multi-stage through-air drying apparatus of claim 4, wherein: The outside of the opening and closing plunger (402) is provided with a track block (4024), and the inside of the fixed seat (401) is provided with a track groove (4012). The track block (4024) is inserted into the inside of the track groove (4012).

6. The process as claimed in claim 5, wherein the said multi-stage through-flow drying unit is a drying unit having a plurality of drying sections. The steps include: ①. During the conveying process of the kraft paper by the conveying device, the kraft paper passes through the inside of the support frame (101). The kraft paper is dried and dried during the process of passing through the inside of the support frame (101); ②. The support assembly (1) can change the effective steam supply length in the inside of the function frame (102), so as to realize the regulation function of the effective drying length. The steam generated by the steam generator enters the inside of the steam channel (1021) through the inlet steam channel (1022), and the steam is finally sprayed out through the opening state pipeline mechanism (4) to realize the drying and drying operation on the passing kraft paper; ③. The effective use length of the steam channel (1021) can be changed by the adjusting rod (103), that is, the effective steam supply length in the inside of the function frame (102) is changed. When the adjusting rod (103) rotates, the two plugging discs (104) can be driven to move synchronously and in opposite directions through the rod body threads, so as to change the interval between the two plugging discs (104). Only the steam channel (1021) in the interval can be supplied with steam, and the steam channel (1021) in the space outside the plugging disc (104) cannot be supplied with steam due to being blocked by the plugging disc (104), so as to regulate the effective use length of the steam channel (1021), which can adapt to the drying and drying operation of kraft paper with different widths. ④. The pipeline mechanism (4) is in a closed state in the reset state, at which time the outside of the pipeline mechanism (4) is not extruded by the opening and closing trigger block (3), so that the opening and closing plunger (402) is in the state of being pushed out under the action of the blocking spring (4021), and at this time the steam passage (4011) and the opening and closing passage (4022) are in a mutual misalignment state, so that the steam in the steam passage (1021) will not be discharged through the pipeline mechanism (4) in the reset state, but will be discharged from the pipeline mechanism (4) at the position of the opening and closing trigger block (3) to realize the drying operation, the passive block (4023) of the pipeline mechanism (4) at the position of the opening and closing trigger block (3) will be extruded by the sliding contact block (301), so that the opening and closing plunger (402) is pushed into the inside of the fixed seat (401), at this time the steam passage (4011) and the opening and closing passage (4022) coincide with each other, so that the steam in the steam passage (1021) will pass through the steam passage (4011) and the opening and closing passage (4022) in turn into the inside of the drying nozzle (403) and be scattered and sprayed, and act on the bottom passing kraft paper to perform drying and drying treatment; ⑤. The sliding contact block (301) is provided with four sliding contact blocks, so that at least four groups of pipeline mechanisms (4) will be opened simultaneously, and the drying and drying effect is good; ⑥. The spacing control assembly (2) can control the use position of the four opening and closing trigger blocks (3), and the change of the use position of the opening and closing trigger block (3) changes the opening and closing state of the pipeline mechanism (4) at the corresponding position, thereby realizing the function of controlling the drying spacing; ⑦. When the rotating control rod (203) is rotated, the control rod (203) can drive the two positioning seats (202) to move through the rod body thread, and the two positioning seats (202) can drive the spacing telescopic frame (201) to perform telescopic action when moving, and the spacing telescopic frame (201) can drive the opening and closing trigger block (3) to move synchronously when telescoping, thereby changing the use position of the opening and closing trigger block (3), and due to the structural characteristics of the spacing telescopic frame (201), the spacing between the four opening and closing trigger blocks (3) is always the same, which ensures that the drying and drying treatment of the kraft paper is uniform; ⑧. When the opening and closing trigger block (3) moves, it will first release the extrusion relationship with the passive block (4023) of the pipeline mechanism (4) at the original position, so that the pipeline mechanism (4) at the position will be automatically closed under the action of the blocking spring (4021), and the passive block (4023) of the pipeline mechanism (4) in the moving direction of the opening and closing trigger block (3) will be extruded by the sliding contact block (301) to be automatically opened, so that when the opening and closing trigger block (3) moves to the required position, only the pipeline mechanism (4) at the position will be in an open state to realize the drying and drying operation on the kraft paper.

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