PVA curing machine

Abstract

The present invention relates to the field of aging equipment and discloses a PVA aging machine, comprising: a heat-conducting outer shell, the heat-conducting outer shell being provided with a feed port for adding additives, and a discharge port at one end of the heat-conducting outer shell; and a heating mechanism disposed on the heat-conducting outer shell, the heating mechanism being used to heat the heat-conducting outer shell and, through the heat-conducting outer shell, heat the material. By providing the heating mechanism, the aging machine provided by the present invention can effectively control the temperature of the alcoholysis reaction. By providing multiple feed ports, different additives can be added according to actual market demand, thereby adjusting the molar ratio of alkali added during alcoholysis, the concentration of the vinyl acetate methanol solution, and the water content. Thus, by using the PVA aging machine provided by the present invention to reprocess polyvinyl alcohol products produced by existing alcoholysis equipment, polyvinyl alcohol products of different specifications can be produced. By providing the PVA aging machine provided by the present invention, polyvinyl alcohol products of various specifications can be produced.

Description

Technical Field

[0001] The present invention relates to the field of curing equipment, in particular to a PVA curing machine. Background Art

[0002] Polyvinyl alcohol, abbreviated as PVA (polyvinyl alcohol), cannot be prepared by the polymerization of the theoretical monomer "vinyl alcohol" because "vinyl alcohol" easily isomerizes to acetaldehyde. It can only be prepared by the alcoholysis or hydrolysis reaction of polyvinyl acetate. The polyvinyl alcohol produced by the alcoholysis method is easy to purify, has high purity, and has good performance of the main product. Therefore, the alcoholysis method is usually used to prepare polyvinyl alcohol in industry.

[0003] However, the current alcoholysis method for producing polyvinyl alcohol (PVA) is limited by the structural features of alcoholysis equipment such as belt alcoholysis machines and pulverizers. To ensure a smooth production process and relatively stable alcoholysis degree and degree of polymerization, which are important indicators of product performance, the alcoholysis reaction temperature, the molar ratio of alkali added during alcoholysis, and the concentration and water content of the vinyl acetate methanol solution must be adjusted to corresponding specified values. This results in the current alcoholysis equipment being able to produce only one specification of PVA, which is uninspired and lacks competitiveness in the consumer market. Therefore, how to prepare PVA of various specifications has become a pressing issue for those skilled in the art. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a PVA ripening machine. By using the PVA ripening machine provided by the present invention to reprocess the polyvinyl alcohol product prepared by the existing alcoholysis setting, the preparation of polyvinyl alcohol of different specifications can be achieved.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a PVA ripening machine, comprising: a heat-conductive shell, the heat-conductive shell being provided with a plurality of feeding ports for adding additives, and a discharge port being provided at one end of the heat-conductive shell; a stirring and conveying mechanism, the stirring and conveying mechanism comprising a rotating shaft and a spiral blade spirally arranged on the rotating shaft along the length direction of the rotating shaft, the two ends of the rotating shaft respectively extending through the two ends of the heat-conductive shell, the spiral blade being used for stirring the material arranged inside the heat-conductive shell and conveying the material to the discharge port; a support, one of the supports being provided at each end of the rotating shaft, and the two ends of the rotating shaft being rotatably supported on the two supports; a power device, the power device being connected to the rotating shaft to drive the rotating shaft to rotate; a heating mechanism, the heating mechanism being provided on the heat-conductive shell, the heating mechanism being used for heating the heat-conductive shell and heating the material through the heat-conductive shell.

[0007] Preferably, the discharge port is provided with an overflow baffle.

[0008] Preferably, the PVA ripening machine further comprises a discharge mechanism, which comprises a discharge plate and a connecting rod, a discharge port is provided on the overflow baffle, the connecting rod is connected to the discharge plate, and the discharge plate is used to open or block the discharge port.

[0009] Preferably, the PVA ripening machine also includes a handle, a positioning sleeve and a clamping sleeve, one end of the connecting rod is connected to the unloading plate, the other end of the connecting rod extends through the heat-conducting shell, the clamping sleeve is sleeved on the connecting rod, and the clamping sleeve is fixed on the heat-conducting shell, one end of the positioning sleeve passes through the clamping sleeve and is positioned by a limiting structure, the handle is sleeved on the outside of the other end of the positioning sleeve and is fixedly connected to the positioning sleeve, the other end of the connecting rod passes through the positioning sleeve and is threadedly connected to the positioning sleeve.

[0010] Preferably, the PVA curing machine further comprises two sealing assemblies, which are symmetrically arranged at both ends of the heat-conductive shell, and both ends of the heat-conductive shell are provided with openings for the rotating shaft to pass through, and the two sealing assemblies correspond one-to-one to the two openings, and the sealing assemblies are used to seal the gap between the corresponding side walls of the openings and the rotating shaft.

[0011] Preferably, the sealing assembly includes: a first sealing sleeve, the first sealing sleeve is arranged in the opening corresponding to it, the rotating shaft passes through the first sealing sleeve, and two sealing tooth assemblies are provided on the inner circumferential wall of the first sealing sleeve along the axial direction of the first sealing sleeve, the sealing tooth assembly includes a plurality of annular teeth arranged side by side along the axial direction of the first sealing sleeve, and a labyrinth cavity is formed between any two adjacent annular teeth, the interior of the first sealing sleeve is connected to the discharge port, and the communication position between the first sealing sleeve and the discharge port is located between the two sealing tooth assemblies; a second sealing sleeve is arranged at one end of the first sealing sleeve away from the heat-conducting shell and connected to the first sealing sleeve, the second sealing sleeve is sleeved on the rotating shaft, and a packing sealing cavity is provided on the inner circumferential wall of the second sealing sleeve, and the packing sealing cavity is arranged along the second sealing A plurality of packing sealing rings are arranged side by side in the axial direction of the sleeve, and each of the packing sealing rings is sleeved on the rotating shaft. A sealing groove is further provided on the inner peripheral wall of one end of the second sealing sleeve close to the first sealing sleeve, and a lip sealing ring is provided in the sealing groove; a distribution hole ring, among the plurality of packing sealing rings, the distribution hole ring is provided between two adjacent packing sealing rings, the distribution hole ring is sleeved on the rotating shaft, and a plurality of air inlet holes are provided on the peripheral side wall of the distribution hole ring, and a plurality of first air outlet holes arranged along the circumference of the distribution hole ring and a plurality of second air outlet holes arranged along the circumference of the distribution hole ring are respectively provided at both ends of the distribution hole ring, the air inlet holes correspond one to one with the first air outlet holes and the second air outlet holes, the air inlet holes are connected with the inert gas, and the air inlet holes are connected with the first air outlet holes and the second air outlet holes corresponding to them.

[0012] Preferably, the heating mechanism is a heating jacket, and a heat exchange medium is provided inside the heating jacket.

[0013] Preferably, the stirring and conveying mechanism further comprises stirring rakes sequentially arranged along the axis of the rotating shaft, the stirring rakes comprising a plurality of stirring blades uniformly arranged along the circumference of the rotating shaft, and each of the stirring blades is fixedly connected to the rotating shaft.

[0014] Preferably, the rotating shaft includes a coaxially arranged driving shaft and a driven shaft, one end of the driving shaft is transmission-connected to one end of the driven shaft, the other end of the driving shaft and the other end of the driven shaft respectively extend through the two ends of the heat-conducting shell and are rotatably supported on the two supports respectively; the number of the power device and the stirring and conveying mechanism are both two, the two stirring and conveying mechanisms are arranged side by side, and the two power devices are respectively used to drive the two rotating shafts to rotate.

[0015] Preferably, the power device includes a motor, a reducer and a manual transmission which are sequentially connected in transmission, and the output end of the manual transmission is transmission-connected to the rotating shaft.

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

[0017] The PVA ripening machine provided by the present invention includes: a heat-conducting outer shell, which is provided with a feeding port for adding additives, and a discharge port is provided at one end of the heat-conducting outer shell; a stirring and conveying mechanism, which includes a rotating shaft and a spiral blade spirally arranged on the rotating shaft along the length direction of the rotating shaft, and the two ends of the rotating shaft respectively extend through the two ends of the heat-conducting outer shell, and the spiral blade is used to stir the material arranged inside the heat-conducting outer shell and convey the material to the discharge port; a support, each end of the rotating shaft is provided with a support, and the two ends of the rotating shaft are rotatably supported on the two supports; a power device, which is connected to the rotating shaft to drive the rotating shaft to rotate; a heating mechanism, which is provided on the heat-conducting outer shell, and the heating mechanism is used to heat the heat-conducting outer shell and heat the material through the heat-conducting outer shell.

[0018] The existing alcoholysis device includes a belt alcoholysis machine, a pulverizer, and a centrifugal dehydrator. The belt alcoholysis machine and pulverizer are used to complete the processing of a fixed specification polyvinyl alcohol product, and the centrifugal dehydrator is used to dehydrate and dry the processed polyvinyl alcohol product. In specific use, the PVA ripening machine provided by the present invention is arranged after the pulverizer and before the centrifugal dehydrator. The polyvinyl alcohol product processed by the belt alcoholysis machine and pulverizer is transported to the ripening machine provided by the present invention. After re-alcoholysis in the ripening machine provided by the present invention, it is transported to the centrifugal dehydrator for dehydration and drying. By providing multiple feeding ports, different additives can be added to the heat-conducting housing of the PVA ripening machine provided by the present invention according to actual market demand, and the molar ratio of the alkali added in the alcoholysis, the concentration of the vinyl acetate methanol solution, and the water content can be adjusted. By providing a heating mechanism, the alcoholysis reaction temperature can be adjusted. In this way, with the help of the PVA ripening machine provided by the present invention, it is possible to produce polyvinyl alcohol products of various specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a front view of a PVA curing machine provided in an embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the internal structure of the PVA curing machine provided in an embodiment of the present invention;

[0022] Figure 3Schematic diagram of the structure of the unloading mechanism of the PVA ripening machine provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic structural diagram of a sealing assembly of a PVA aging machine provided in an embodiment of the present invention;

[0024] Figure 5 Schematic diagram of the structure of the stirring and conveying mechanism of the PVA ripening machine provided in an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 100. PVA aging machine; 1. Heat-conducting housing; 101. Feeding port; 2. Rotating shaft; 201. Driving shaft; 202. Driven shaft; 203. Connecting short shaft; 3. Spiral blade; 4. Mixing rake; 5. Support; 6. Power unit; 7. Heating mechanism; 8. Overflow baffle; 9. Discharge mechanism; 901. Discharge plate; 902. Connecting rod; 903. Handle; 10. Positioning sleeve; 11. Clamping sleeve; 12. First sealing sleeve; 1201. Annular gear; 13. Draft tube; 14. Second sealing sleeve; 15. Packing seal ring; 16. Distribution hole ring; 17. Hanger; 18. Discharge pipe; 19. Lip seal ring; 20. Pressure cover; 21. Third sealing sleeve. DETAILED DESCRIPTION

[0027] 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.

[0028] The purpose of the present invention is to provide a aging machine capable of preparing polyvinyl alcohol products of various specifications.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] refer to Figure 1-Figure 5As shown, the PVA curing machine 100 provided in this embodiment includes: a heat-conductive shell 1, the heat-conductive shell 1 is provided with a feeding port 101 for adding additives, and a discharge port is provided at one end of the heat-conductive shell 1; a stirring and conveying mechanism, the stirring and conveying mechanism includes a rotating shaft 2 and a spiral blade 3 spirally arranged on the rotating shaft 2 along the length direction of the rotating shaft 2, and the two ends of the rotating shaft 2 respectively extend through the two ends of the heat-conductive shell 1, and the spiral blade 3 is used to stir the material set inside the heat-conductive shell 1 and convey the material to the discharge port support 5, and a support 5 is provided at each end of the rotating shaft 2, and the two ends of the rotating shaft 2 are rotatably supported on the two supports 5; a power device 6, the power device 6 is connected to the rotating shaft 2 to drive the rotating shaft 2 to rotate; a heating mechanism 7, the heating mechanism 7 is provided on the heat-conductive shell 1, and the heating mechanism 7 is used to heat the heat-conductive shell 1 and heat the material through the heat-conductive shell 1.

[0031] Existing alcoholysis equipment includes a belt alcoholysis machine, a pulverizer, and a centrifugal dehydrator. The belt alcoholysis machine and pulverizer are used to complete the processing of a fixed specification of polyvinyl alcohol product, and the centrifugal dehydrator is used to dehydrate and dry the processed polyvinyl alcohol product. In specific use, the PVA ripening machine 100 provided by the present invention is arranged after the pulverizer and before the centrifugal dehydrator. The polyvinyl alcohol product processed by the belt alcoholysis machine and pulverizer is transported to the ripening machine provided by the present invention. After re-alcoholysis in the ripening machine provided by the present invention, it is transported to the centrifugal dehydrator for dehydration and drying. By providing multiple feeding ports 101, different additives can be added to the heat-conductive housing 1 of the PVA ripening machine 100 provided by the present invention according to actual market demand. The molar ratio of the alkali added during the alcoholysis, the concentration of the vinyl acetate methanol solution, and the water content can be adjusted. By providing a heating mechanism 7, the alcoholysis reaction temperature can be adjusted. In this way, the PVA ripening machine 100 provided by the present invention can achieve the production of polyvinyl alcohol products of various specifications.

[0032] In this embodiment, the additives specifically include acetic acid, methanol, a base involved in the alcoholysis reaction, and water. Furthermore, the heat-conducting housing 1 is provided with four feeding ports 101, each for adding acetic acid, methanol, a base involved in the alcoholysis reaction, and water. It should be noted that the provision of four feeding ports 101 is not limited to this; other numbers may also be provided. Furthermore, multiple additives may share a single feeding port 101, with each additive being added to the interior of the heat-conducting housing 1 through the single feeding port 101.

[0033] Furthermore, the feeding port 101 is provided at the top of the heat-conducting housing 1 , and the discharging port is connected to the discharging pipe 18 .

[0034] Furthermore, the heat-conducting housing 1 is also provided with an observation port, a light irradiation port, a pressure measuring port and a temperature measuring port.

[0035] In this embodiment, in order to allow the material and the additive to react fully, an overflow baffle 8 is provided at the discharge port, and the discharge is started only when the material is filled in the shell to the overflow plate position.

[0036] In this embodiment, if Figure 2-Figure 3 As shown, the PVA curing machine 100 further includes a discharge mechanism 9, which includes a discharge plate 901 and a connecting rod 902. A discharge port is provided on the overflow baffle 8. The connecting rod 902 is connected to the discharge plate 901, which is used to open or close the discharge port. During use, the discharge plate 901 discharges the remaining material in the heat-conducting housing 1.

[0037] In this embodiment, if Figure 3 As shown, the PVA aging machine 100 also includes a handle 903, a positioning sleeve 10, and a clamping sleeve 11. One end of the connecting rod 902 is connected to the discharge plate 901, and the other end of the connecting rod 902 extends through the heat-conducting shell 1. The clamping sleeve 11 is sleeved on the connecting rod 902 and fixed to the heat-conducting shell 1. One end of the positioning sleeve 10 passes through the clamping sleeve 11 and is positioned by a limiting structure. The handle 903 is sleeved on the outside of the other end of the positioning sleeve 10 and is fixedly connected to the positioning sleeve 10. The other end of the connecting rod 902 passes through the positioning sleeve 10 and is threadedly connected to the positioning sleeve 10. During specific use, by rotating the handle 903 forward and backward, the connecting rod 902 drives the discharge plate 901 to move away from or toward the discharge port, thereby opening or closing the discharge port.

[0038] Furthermore, the limiting structure is specifically a limiting flange, the clamping sleeve 11 is against the limiting flange, and the two ends of the positioning sleeve 10 are positioned by the handle 903 and the limiting flange respectively.

[0039] In this embodiment, the PVA curing machine 100 also includes two sealing components, which are symmetrically arranged at both ends of the heat-conducting shell 1. Both ends of the heat-conducting shell 1 are provided with openings for the rotating shaft 2 to pass through. The two sealing components correspond one-to-one to the two openings, and the sealing components are used to seal the gap between the corresponding opening side walls and the rotating shaft 2.

[0040] Furthermore, if Figure 4As shown, the sealing assembly includes: a first sealing sleeve 12, the first sealing sleeve 12 is arranged in the opening corresponding to it, the rotating shaft 2 passes through the first sealing sleeve 12, and two sealing tooth assemblies are arranged on the inner circumferential wall of the first sealing sleeve 12 along the axial direction of the first sealing sleeve 12, the sealing tooth assembly includes a plurality of annular teeth 1201 arranged side by side along the axial direction of the first sealing sleeve 12, and a labyrinth cavity is formed between any two adjacent annular teeth 1201, the interior of the first sealing sleeve 12 is connected to the discharge port, and the communication position between the first sealing sleeve 12 and the discharge port is located between the two sealing tooth assemblies; a second sealing sleeve 14 is arranged at one end of the first sealing sleeve 12 away from the heat-conducting shell 1 and connected to the first sealing sleeve 12, the second sealing sleeve 14 is sleeved on the rotating shaft 2, and a packing sealing cavity is provided on the inner circumferential wall of the second sealing sleeve 14, and the packing sealing cavity is arranged along the second sealing A plurality of packing sealing rings 15 are arranged side by side in the axial direction of the sleeve 14, and each packing sealing ring 15 is sleeved on the rotating shaft 2. A sealing groove is also provided on the inner peripheral wall of the end of the second sealing sleeve 14 close to the first sealing sleeve 12, and a lip sealing ring 19 is provided in the sealing groove; a distribution hole ring 16, among the plurality of packing sealing rings 15, a distribution hole ring 16 is provided between two adjacent packing sealing rings 15, and the distribution hole ring 16 is sleeved on the rotating shaft 2, and a plurality of air inlet holes are provided on the peripheral side wall of the distribution hole ring 16, and a plurality of first air outlet holes arranged along the circumference of the distribution hole ring 16 and a plurality of second air outlet holes arranged along the circumference of the distribution hole ring 16 are respectively provided at both ends of the distribution hole ring 16, and the air inlet holes correspond to the first air outlet holes and the second air outlet holes one by one, and the air inlet holes are connected to the inert gas, and the air inlet holes are connected to the first air outlet holes and the second air outlet holes corresponding thereto.

[0041] Furthermore, the inert gas is specifically selected to be nitrogen. The first sealing sleeve 12 is connected to the discharge port through the flow guide pipe 13, and the communication position between the first sealing sleeve 12 and the flow guide pipe 13 is located between the two sealing tooth assemblies.

[0042] During operation, after the initial seal by the first sealing sleeve 12, leaked liquid and solid phases are guided to the discharge port through the flow guide tube 13 for convergence. Gas phase leaks are then secondary sealed by the lip seal 19, the packing seal ring 15, and the distribution hole ring 16. By providing these sealing components, the sealing effect of the PVA aging machine 100 provided in this embodiment is greatly improved.

[0043] Furthermore, a third sealing sleeve 21 is provided on the heat-conducting housing 1, through which the connecting rod 902 passes. A sealing filler is provided between the third sealing sleeve 21 and the connecting rod 902 to seal the gap therebetween. Furthermore, one end of the third sealing sleeve 21 is closed, and the other end is provided with an inlet and a gland 20 for opening or closing the inlet. The sealing filler is inserted between the third sealing sleeve 21 and the connecting rod 902 through the inlet.

[0044] In this embodiment, the heating mechanism 7 is a heating jacket, and a heat exchange medium is provided inside the heating jacket.

[0045] Furthermore, the heating jacket is a tubular structure. However, this is not limited to tubular structures and may also be a honeycomb structure. Furthermore, multiple heating mechanisms 7 may be provided along the length of the heat-conducting housing 1 as needed, and the temperatures of the multiple heating mechanisms 7 may be the same or different, depending on actual needs.

[0046] Furthermore, the heat exchange medium is water, but is not limited to water, and other media that can achieve heat exchange can also be selected.

[0047] In this embodiment, in order to make the material and additives mix more fully, the stirring and conveying mechanism also includes a stirring rake 4 arranged in sequence along the axial direction of the rotating shaft 2, and the stirring rake 4 includes a plurality of stirring blades evenly arranged along the circumference of the rotating shaft 2, and each stirring blade is fixedly connected to the rotating shaft 2.

[0048] In this embodiment, if Figure 5 As shown, the rotating shaft 2 includes a coaxially arranged driving shaft 201 and a driven shaft 202, one end of the driving shaft 201 is transmission-connected to one end of the driven shaft 202, and the other end of the driving shaft 201 and the other end of the driven shaft 202 respectively extend through the two ends of the heat-conducting housing 1 and are rotatably supported on two supports 5.

[0049] Furthermore, a first mounting hole and a second mounting hole are respectively provided at the opposite ends of the driving shaft 201 and the driven shaft 202, and the two ends of the connecting short shaft 203 are respectively embedded in the first mounting hole and the second mounting hole, and the two ends of the connecting short shaft 203 are respectively connected to the driving shaft 201 and the driven shaft through a first bolt and a second bolt.

[0050] Furthermore, the connecting short shaft 203 is connected to the inner wall of the heat-conducting shell 1 through the hanger 17. A hanging sliding bearing is installed on the connecting short shaft 203, and the hanging sliding bearing is installed in a hanging bearing seat, and the hanging bearing seat is fixed to the shell through the hanger 17.

[0051] In this embodiment, the number of the power device 6 and the stirring and conveying mechanism are both two, and the two stirring and conveying mechanisms are arranged side by side. The two power devices 6 are respectively used to drive the two rotating shafts 2 to rotate. By setting up two stirring and conveying mechanisms, the material and the additive can be mixed more fully.

[0052] In this embodiment, the power device 6 includes a motor, a reducer and a manual transmission which are sequentially connected in transmission, and the output end of the manual transmission is connected in transmission to the rotating shaft 2. During specific use, the speed of the rotating shaft 2 is adjusted by the manual transmission.

[0053] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A PVA curing machine, characterized in that: include: A heat-conducting shell, wherein the heat-conducting shell is provided with a feeding port for adding additives, and one end of the heat-conducting shell is provided with a discharge port; a stirring and conveying mechanism, the stirring and conveying mechanism comprising a rotating shaft and a spiral blade spirally arranged on the rotating shaft along the length direction of the rotating shaft, the two ends of the rotating shaft respectively extending through the two ends of the heat-conducting shell, the spiral blade being used to stir the material disposed inside the heat-conducting shell and convey the material to the discharge port; a support, one of the supports being provided at each end of the rotating shaft, and the two ends of the rotating shaft being rotatably supported on the two supports; A power device is connected to the rotating shaft to drive the rotating shaft to rotate; a heating mechanism is arranged on the heat-conducting shell, and the heating mechanism is used to heat the heat-conducting shell and heat the material through the heat-conducting shell; the PVA ripening machine is used to be arranged after the crusher and before the centrifugal dehydrator, and the polyvinyl alcohol product processed by the belt hydrolyzer and the crusher is transported to the PVA ripening machine for re-alcoholization, and multiple feeding ports are provided to enable different additives to be added to the inside of the heat-conducting shell of the PVA ripening machine; it also includes two sealing assemblies, and the two sealing assemblies are symmetrically arranged at both ends of the heat-conducting shell. Both ends of the heat-conducting shell are provided with openings for the rotating shaft to pass through, and the two sealing assemblies correspond to the two openings one by one, and the sealing assemblies are used to seal the gap between the corresponding side walls of the openings and the rotating shaft; the sealing assembly includes: a first sealing sleeve, the first sealing sleeve is arranged in the corresponding opening, the rotating shaft passes through the first sealing sleeve, and two sealing tooth assemblies are arranged on the inner peripheral wall of the first sealing sleeve along the axial direction of the first sealing sleeve, and the sealing tooth assembly includes a plurality of annular teeth arranged side by side along the axial direction of the first sealing sleeve, and a labyrinth cavity is formed between any two adjacent annular teeth. The interior of the first sealing sleeve is connected to the discharge port, and the communication position between the first sealing sleeve and the discharge port is located between the two sealing tooth assemblies; a second sealing sleeve is arranged at one end of the first sealing sleeve away from the heat-conducting shell and connected to the first sealing sleeve, the second sealing sleeve is sleeved on the rotating shaft, a packing sealing cavity is provided on the inner circumferential wall of the second sealing sleeve, a plurality of packing sealing rings are arranged side by side in the packing sealing cavity along the axial direction of the second sealing sleeve, each of the packing sealing rings is sleeved on the rotating shaft, a sealing groove is also provided on the inner circumferential wall of the end of the second sealing sleeve close to the first sealing sleeve, the sealing A lip sealing ring is provided in the groove; a distribution hole ring, wherein the distribution hole ring is provided between two adjacent packing sealing rings among the multiple packing sealing rings, the distribution hole ring is sleeved on the rotating shaft, and a plurality of air inlet holes are provided on the peripheral side wall of the distribution hole ring, and a plurality of first air outlet holes arranged along the circumference of the distribution hole ring and a plurality of second air outlet holes arranged along the circumference of the distribution hole ring are respectively provided at both ends of the distribution hole ring, the air inlet holes correspond one-to-one to the first air outlet holes and the second air outlet holes, the air inlet holes are connected to the inert gas, and the air inlet holes are connected to the first air outlet holes and the second air outlet holes corresponding to them.

2. The PVA aging machine according to claim 1, characterized in that: The discharge port is provided with an overflow baffle.

3. The PVA aging machine according to claim 2, characterized in that: It also includes a discharge mechanism, which includes a discharge plate and a connecting rod. A discharge port is provided on the overflow baffle. The connecting rod is connected to the discharge plate, and the discharge plate is used to open or block the discharge port.

4. The PVA aging machine according to claim 3, characterized in that: It also includes a handle, a positioning sleeve and a clamping sleeve. One end of the connecting rod is connected to the unloading plate, and the other end of the connecting rod extends through the heat-conducting shell. The clamping sleeve is mounted on the connecting rod and fixed on the heat-conducting shell. One end of the positioning sleeve passes through the clamping sleeve and is positioned by a limiting structure. The handle is mounted on the outside of the other end of the positioning sleeve and is fixedly connected to the positioning sleeve. The other end of the connecting rod passes through the positioning sleeve and is threadedly connected to the positioning sleeve.

5. The PVA aging machine according to claim 1, characterized in that: The heating mechanism is a heating jacket, and a heat exchange medium is arranged inside the heating jacket.

6. The PVA aging machine according to claim 1, characterized in that: The stirring and conveying mechanism further comprises a stirring rake sequentially arranged along the axis direction of the rotating shaft, and the stirring rake comprises a plurality of stirring blades uniformly arranged along the circumference of the rotating shaft, and each stirring blade is fixedly connected to the rotating shaft.

7. The PVA aging machine according to claim 1, characterized in that: The rotating shaft includes a coaxially arranged driving shaft and a driven shaft, one end of the driving shaft is transmission-connected to one end of the driven shaft, the other end of the driving shaft and the other end of the driven shaft respectively extend through the two ends of the heat-conducting shell and are rotatably supported on the two supports respectively; the number of the power device and the stirring and conveying mechanism are both two, the two stirring and conveying mechanisms are arranged side by side, and the two power devices are respectively used to drive the two rotating shafts to rotate.

8. The PVA aging machine according to claim 1, characterized in that: The power device includes a motor, a reducer and a manual transmission which are sequentially connected in transmission, and the output end of the manual transmission is transmission-connected to the rotating shaft.

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