CN217144264U

CN217144264U - Fiber sizing system

Info

Publication number: CN217144264U
Application number: CN202221014175.4U
Authority: CN
Inventors: 石邵勇; 孙国军; 罗修民
Original assignee: Foshan Pulomis Intelligent Manufacturing Co ltd
Current assignee: Foshan Pulomis Intelligent Manufacturing Co ltd
Priority date: 2022-04-27
Filing date: 2022-04-27
Publication date: 2022-08-09
Anticipated expiration: 2032-04-27

Abstract

The utility model discloses a fibre glueing system, include: the steam separation device is provided with a steam separation cavity, a first feeding hole, a first discharging hole and a steam outlet; the sizing device is provided with a sizing cavity, a second feeding hole and a second discharging hole, and is also provided with a sizing nozzle communicated with the sizing cavity, and the sizing nozzle is used for sizing the fibers passing through the sizing cavity; drying device, drying device are equipped with drying chamber, third feed inlet and third discharge gate, and drying chamber is used for drying the fibre. The fiber discharged by the hot mill is firstly sent into a steam separation cavity of a steam separation device, and the steam can be separated from the fiber mass, so that the temperature and the pressure of the fiber can be reduced; then the fiber enters a glue applying cavity of the glue applying device, glue is sprayed to the fiber by the glue applying nozzle, and the glue is sprayed and mixed with the fiber in the environment with lower temperature and pressure, so that the solidification speed of the glue is reduced, the glue and the fiber can be mixed more fully and uniformly, and the waste of the glue is reduced.

Description

Fiber sizing system

Technical Field

The utility model relates to a panel production technical field, in particular to fibre glueing system.

Background

The density board is a board prepared by taking wood fibers or other plant fibers as raw materials, preparing the fibers and pressing the fibers under the conditions of heating and pressurizing. At present, when preparing fiber, a hot mill grinds raw materials into fiber under the conditions of high temperature and high pressure, then the fiber is applied with glue in a spraying pipeline, the fiber is mixed with the glue, and then the fiber is dried. Because the spraying pipeline is in a high-temperature and high-pressure state, the temperature can reach 175 ℃ and the pressure can reach 6bar generally, and after the glue enters the spraying pipeline, partial glue is solidified under the condition that the glue is not uniformly and fully mixed with the fibers, so that the glue is wasted.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a fibre glueing system, when aiming at solving among the prior art fibre when glue applying in the highly compressed pipeline of putting of spouting of high temperature, partial glue just produces under the condition that does not have with fibre intensive mixing and solidifies, causes the extravagant technical problem of glue.

In order to achieve the above object, the utility model provides a fiber gluing system, include:

the steam separation device is provided with a steam separation cavity, a first feed inlet, a first discharge outlet and a steam outlet, and the first feed inlet, the first discharge outlet and the steam outlet are communicated with the steam separation cavity;

the sizing device is provided with a sizing cavity, a second feeding hole and a second discharging hole, the second feeding hole and the second discharging hole are both communicated with the sizing cavity, the second feeding hole is communicated with the first discharging hole, the sizing device is also provided with a sizing nozzle communicated with the sizing cavity, and the sizing nozzle is used for sizing fibers passing through the sizing cavity;

drying device, drying device is equipped with dry chamber, third feed inlet and third discharge gate, the third feed inlet with the third discharge gate all with dry chamber intercommunication, the third feed inlet with second discharge gate intercommunication, dry chamber is used for drying the fibre.

The fiber mass discharged by the hot grinding of the defibrator contains a large amount of high-pressure and high-temperature steam, the fiber discharged by the hot grinding is firstly sent into a steam separation cavity of a steam separation device, the steam can be separated from the fiber mass, and the temperature and the pressure of the fiber can be reduced; then the fiber enters a sizing cavity of a sizing device, a sizing nozzle sprays glue to the fiber, the glue is sprayed out and mixed with the fiber in an environment with lower temperature and pressure, the solidification speed of the glue is reduced, and the glue and the fiber can be fully and uniformly mixed; and then the fiber mixed with the glue enters a drying cavity of a drying device to realize the drying of the fiber. The technology separates the steam in the fiber, and then applies glue in the environment of lower temperature and lower pressure, which is different from the prior art that glue is applied in a high-temperature high-pressure spraying pipeline, thereby improving the utilization rate of the glue and reducing the waste caused by solidification of the glue applied in the environment of high temperature and high pressure.

Preferably, fibre glueing system still includes the heat sink, the heat sink is equipped with cooling chamber, fourth feed inlet and fourth discharge gate, the fourth feed inlet with the fourth discharge gate all with cooling chamber intercommunication, the fourth feed inlet with first discharge gate intercommunication, the fourth discharge gate with the second feed inlet intercommunication.

The temperature of the fiber may be still higher after the pressure is reduced by the separation steam; the fiber is sent into a cooling cavity of the cooling device for cooling, and the temperature of the fiber can be further reduced, so that the temperature during glue application is further reduced, the solidification of glue is further reduced, and the utilization rate of the glue is improved.

Preferably, the heat sink includes the cooling pipe, the cooling chamber is located the inboard of cooling pipe, the fourth feed inlet with the fourth discharge gate is located respectively the length direction's of cooling pipe both sides, the cooling intracavity is equipped with the cooling spiral, the axis of cooling spiral is followed the length direction of cooling pipe extends, the cooling spiral with the cooling pipe rotates to be connected.

During the fibre entered into the cooling pipe, the cooling spiral pushed the fibre to the fourth discharge gate from the fourth feed inlet, and the in-process fibre of pushing can obtain the cooling.

Preferably, the cooling device further comprises a water spraying opening, the water spraying opening is communicated with the cooling cavity, and the water spraying opening is used for spraying water to cool the fibers passing through the cooling cavity. The water spray nozzle sprays water mist to the fibers of the cooling cavity, and the temperature of the fibers can be rapidly reduced by the water.

Preferably, the gluing device includes the pipe of breaing up of vertical setting, the gluey chamber is located the inboard of breaing up the pipe, the second feed inlet with the second discharge gate is located respectively the upside and the downside of breaing up the pipe, the inboard in gluey chamber is equipped with the spiral of breaing up, the axis of the spiral of breaing up extends along the length direction of breaing up the pipe, the spiral of breaing up with it is connected to break up the pipe rotation, the gluey nozzle is located the downside of the spiral of breaing up.

The fiber after temperature and pressure reduction enters a vertically arranged scattering pipe, and the fiber can be scattered by the rotation of the scattering spiral to form a discrete shape; glue is sprayed out of the glue applying nozzle, when the fiber falls to the position of the glue applying nozzle, the glue is mixed with the fiber, and the discrete fiber can enable the fiber to be more fully mixed with the glue.

Preferably, drying device includes the drying tube, the drying chamber is located the inboard of drying tube, the third feed inlet with the third discharge gate is located respectively the length direction's of drying tube both sides, the drying tube still includes hot-blast import, hot-blast import with the third discharge gate is located respectively the both ends of drying tube, the third feed inlet is located and is close to the upside of one side of hot-blast import.

The fibre after the glueing falls into the drying tube, blows in hot-blast from hot-blast import, and hot-blast temperature can make the fibre dry, and hot-blast blowing fibre is to third discharge gate simultaneously, simple structure.

Preferably, the steam outlet is provided with a steam recovery conduit. The steam separated from the fibers has heat, and the steam outlet is connected with the steam recovery pipeline, so that the steam can be recovered to be reused in occasions needing heating, the utilization rate of energy is improved, and the energy consumption is reduced.

Preferably, the fiber sizing system further comprises a raw material cooking container and a defibrator, wherein the raw material cooking container is provided with a steam inlet and a sixth discharge hole, the steam inlet is communicated with the steam outlet through a steam recovery pipeline, the defibrator is provided with a seventh feed port and a seventh discharge hole, the seventh feed port is communicated with the sixth discharge hole, and the seventh discharge hole is communicated with the first feed port.

The raw material is cooked in the raw material cooking container before entering the defibrator, and the steam recovered in the technology is conveyed to the raw material cooking container and provides heat for the raw material cooking container, so that the steam can be effectively utilized.

Preferably, the steam separation device is a cyclone separator. After the hot-milled fibers enter the cyclone separator, the fibers rotate in the cyclone separator, steam can be separated from fiber clusters and is separated into the fibers and the steam under the action of centrifugal force, the fibers are discharged from the first discharge port, and the steam is discharged from the steam outlet.

Preferably, fibre glueing system still includes conveyor, conveyor includes conveyer pipe and transport screw, the inboard of conveyer pipe is equipped with carries the chamber, be equipped with fifth feed inlet and fifth discharge gate on the conveyer pipe, the fifth feed inlet with the fifth discharge gate all with carry the chamber intercommunication, carry screw to locate carry the inboard in chamber, carry screw with the conveyer pipe rotates to be connected, the fifth feed inlet with the fifth discharge gate is located respectively the length direction's of conveyer pipe both sides, the fifth feed inlet with first discharge gate intercommunication, the fifth discharge gate with second feed inlet intercommunication.

The fiber after the steam separation enters the conveying device firstly and then enters the sizing device, the fiber enters the conveying cavity of the conveying pipe, the fiber is conveyed to the sizing device through the conveying screw, and when too many or too few fibers come out from the steam separation device, the conveying screw can enable the conveying amount of the fiber to be more uniform, and the uniformity of the sizing amount of the fiber is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of the present invention.

In the drawings: 1-steam separation device, 11-steam separation cavity, 12-first feed inlet, 13-first discharge outlet, 14-steam outlet, 15-steam recovery pipeline, 2-glue applying device, 21-glue applying cavity, 22-second feed inlet, 23-second discharge outlet, 24-glue applying nozzle, 25-scattering helix, 3-drying device, 31-drying cavity, 32-third feed inlet, 33-third discharge outlet, 34-hot air inlet, 35-hot air machine, 4-cooling device, 41-cooling cavity, 42-fourth feed inlet, 43-fourth discharge outlet, 45-cooling helix, 46-water spray outlet, 5-raw material cooking container, 51-steam inlet, 52-sixth discharge outlet, 6-hot mill, etc, 61-a seventh feeding hole, 62-a seventh discharging hole, 7-a conveying device and 71-a conveying cavity.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications such as up, down, left, right, front, back, etc. are referred to in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture, and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

As shown in fig. 1, a fiber sizing system includes a steam separation device 1, a sizing device 2, and a drying device 3, which are arranged in this order.

The steam separation device 1 is provided with a steam separation cavity 11, a first feeding hole 12, a first discharging hole 13 and a steam outlet 14, and the first feeding hole 12, the first discharging hole 13 and the steam outlet 14 are all communicated with the steam separation cavity 11. The hot-milled fibers enter the steam separation cavity 11 from the first feeding hole 12, the fibers are separated from steam in the steam separation cavity 11, the temperature and the pressure of the fibers are reduced, and the temperature and the pressure during subsequent sizing can be reduced. The separated fibers are discharged from a first discharge port 13, and the steam is discharged from a steam outlet 14.

The sizing device 2 is provided with a sizing cavity 21, a second feeding hole 22 and a second discharging hole 23, the second feeding hole 22 and the second discharging hole 23 are both communicated with the sizing cavity 21, the second feeding hole 22 is communicated with the first discharging hole 13, the sizing device 2 is further provided with a sizing nozzle 24 communicated with the sizing cavity 21, and the sizing nozzle 24 is used for sizing fibers passing through the sizing cavity 21. The temperature in the glue application cavity 21 is 75-98 ℃. The fiber after steam separation enters the glue applying cavity 21 from the second feeding hole 22, glue is sprayed out from the glue applying nozzle 24 and mixed with the fiber to realize glue applying to the fiber, and the fiber after glue applying is discharged from the second discharging hole 23. The pressure of the fiber in the glue applying cavity 21 is smaller than that of the fiber subjected to hot grinding by the defibrator 6, the pressure of the fiber in the glue applying cavity 21 is lower, the temperature of the fiber is lower, glue is not easy to solidify, the glue can be well attached to the fiber, and the utilization rate of the glue is improved.

The drying device 3 is provided with a drying cavity 31, a third feeding port 32 and a third discharging port 33, the third feeding port 32 and the third discharging port 33 are both communicated with the drying cavity 31, the third feeding port 32 is communicated with the second discharging port 23, and the drying cavity 31 is used for drying the fibers. The fiber after sizing enters the drying cavity 31 from the third feeding port 32, the fiber is dried in the drying cavity 31, and finally the fiber is discharged from the third discharging port 33 and sent to a storage bin for subsequent board making.

The fiber mass discharged by the hot grinding of the hot grinding machine 6 contains a large amount of high-pressure and high-temperature steam, the fiber discharged by the hot grinding is firstly sent into the steam separation cavity 11 of the steam separation device 1, the steam can be separated from the fiber mass, and the temperature and the pressure of the fiber can be reduced. The fiber then enters the glue applying cavity 21 of the glue applying device 2, the glue applying nozzle 24 sprays glue to the fiber, the glue is sprayed out and mixed with the fiber in the environment with lower temperature and pressure, the solidification speed of the glue is slowed down, and the glue and the fiber can be mixed more fully and uniformly. Then the fiber mixed with the glue enters the drying cavity 31 of the drying device 3, so that the fiber is dried, and the viscosity of the glue is increased. The technology separates the steam in the fiber, and then applies glue in the environment of lower temperature and lower pressure, so that the glue and the fiber are mixed more uniformly and fully, the technology is different from the prior art of applying glue in a high-temperature high-pressure spraying pipeline, the utilization rate of the glue is improved, the waste caused by solidification of the glue applied in the environment of high temperature and high pressure is reduced, and the glue consumption is reduced.

In the existing glue applying process for the density board, glue is directly added into a spraying pipeline after hot grinding; because after adding glue, fibre viscosity increases, if after the glueing with splitter separation steam and fibre, the fibre of high viscosity can solidify in splitter, glues in the equipment, causes the equipment to block up, unable normal work, so current glueing system can't separate steam and fibre with splitter, just also can't realize the cryogenic glueing condition of ordinary pressure, has caused under the high pressure high temperature glueing state, the glue of production solidifies the waste that leads to glue.

In some embodiments, the fiber sizing system further includes a cooling device 4, the cooling device 4 is provided with a cooling cavity 41, a fourth feeding hole 42 and a fourth discharging hole 43, the fourth feeding hole 42 and the fourth discharging hole 43 are both communicated with the cooling cavity 41, the fourth feeding hole 42 is communicated with the first discharging hole 13, and the fourth discharging hole 43 is communicated with the second feeding hole 22.

The temperature of the fiber may be higher after the pressure is reduced by separating the steam; the fibers are sent into the cooling cavity 41 of the cooling device 4 for cooling, so that the temperature of the fibers can be further reduced, the temperature during glue application is further reduced, the solidification of glue is further reduced, and the utilization rate of the glue is improved.

Further, heat sink 4 includes the cooling pipe, and the cooling pipe transversely sets up, and the inboard of cooling pipe is located to cooling chamber 41, and the length direction's of cooling pipe both sides are located respectively to fourth feed inlet 42 and fourth discharge gate 43, are equipped with cooling spiral 45 in the cooling chamber 41, and the length direction of cooling pipe is extended along to the axis of cooling spiral 45, and cooling spiral 45 rotates with the cooling pipe to be connected.

During the fibre entered into the cooling pipe from fourth feed inlet 42, the motor drove cooling spiral 45 and rotates, and the fibre is followed fourth feed inlet 42 propelling movement to fourth discharge gate 43, and the fibre can obtain the cooling at the in-process of propelling movement.

Further, the temperature reduction device 4 further comprises a water spraying opening 46, the water spraying opening 46 is communicated with the temperature reduction cavity 41, and the water spraying opening 46 is used for spraying water to reduce the temperature of the fibers passing through the temperature reduction cavity 41. The water spray nozzle 46 sprays water mist on the fibers in the cooling cavity 41, and the water can rapidly reduce the temperature of the fibers.

In some embodiments, the glue applying device 2 comprises a vertically arranged scattering pipe, the glue applying cavity 21 is arranged on the inner side of the scattering pipe, the second feed inlet 22 and the second discharge outlet 23 are respectively arranged on the upper side and the lower side of the scattering pipe, the inner side of the glue applying cavity 21 is provided with a scattering spiral 25, the scattering spiral 25 extends along the length direction of the scattering pipe, the scattering spiral 25 is rotatably connected with the scattering pipe, and the glue applying nozzle 24 is arranged on the lower side of the scattering spiral 25.

The fiber after temperature and pressure reduction is in a shape of a ball, and the mixing of the fiber ball and glue inside the fiber ball needs to be considered during glue application. The fibers are sent into a vertically arranged scattering pipe, and when the fibers fall downwards, the motor drives the scattering screw 25 to rotate so as to scatter the fibers, so that the fibers are scattered and are similar to floccules; the fibers continuously drop, glue is sprayed out of the glue applying nozzles 24, when the fibers drop to the positions of the glue applying nozzles 24, the glue is mixed with the fibers, and the floating discrete fibers can enable the mixing with the glue to be more sufficient.

Further, the spraying direction of the sizing nozzle 24 is perpendicular to the fiber falling direction, and the glue spraying pressure of the sizing nozzle is 1.5-3 bar. Under the spraying direction and the spraying pressure, the mixing effect of the fiber and the glue is better. The jet flow of the glue applying nozzle is matched with the falling flow of the fibers, the jet flow can be increased when the glue amount is large, and the jet flow can be reduced when the glue amount is small. It should be noted that the air pressure of the air stream in the glue application chamber may be influenced by the rotation of the dispersion screw and the pressure of the glue spray, but is still lower than the pressure after the hot grinding by the thermo-grinder 6.

In some embodiments, the drying device 3 includes a drying tube, the drying tube is disposed horizontally, the drying cavity 31 is disposed inside the drying tube, the third feeding hole 32 and the third discharging hole 33 are respectively disposed at two sides of the drying tube in the length direction, the drying tube further includes a hot air inlet 34, a hot air blower 35 is disposed at the hot air inlet 34 to generate hot air, the hot air inlet 34 and the third discharging hole 33 are respectively disposed at two ends of the drying tube, and the third feeding hole 32 is disposed at an upper side of a side close to the hot air inlet 34.

The glued fiber falls into the drying tube from the third feed port 32, high-speed hot air is blown from the hot air inlet 34, the fiber is dried at the hot air temperature, and simultaneously the high-speed hot air blows the fiber to the third discharge port 33, so that the structure is simple. In some embodiments, a break-up pipe is attached to the upper side of the drying pipe, the fibers that have been sized by the break-up pipe fall into the drying pipe, and hot air is blown directly through the fibers for drying.

In some embodiments, the steam outlet 14 is provided with a steam recovery conduit 15. The steam separated from the fibers is also higher in temperature and has more heat; the steam outlet 14 is connected with a steam recovery pipeline 15, so that steam can be recovered to be reused in occasions needing heating, the utilization rate of energy is improved, and the energy consumption is reduced.

Further, the fiber sizing system also comprises a raw material cooking container 5 and a defibrator 6, wherein the raw material cooking container 5 is provided with a steam inlet 51 and a sixth discharge hole 52, the steam inlet 51 is communicated with the steam outlet 14 through a steam recovery pipeline 15, the defibrator 6 is provided with a seventh feed inlet 61 and a seventh discharge hole 62, the seventh feed inlet 61 is communicated with the sixth discharge hole 52, and the seventh discharge hole 62 is communicated with the first feed inlet 12.

The raw material is subjected to cooking in a raw material cooking vessel 5 before entering a defibrator 6. The steam that retrieves in this technique carries raw materials cooking container 5 and provides the heat for raw materials cooking container 5, and raw materials cooking can be for preheating before the raw materials is cooked or the process of cooking of raw materials, can effectively utilize steam, and retrieves and uses in the relevant technology of density board, and it is more convenient to use, and calorific loss is few. The cooked material is fed into a defibrator 6, after which the fibers are fed into a steam separation unit 1.

Further, the steam separating device 1 is a cyclone separator. The cyclone separator can separate solid and gas, after the hot milled fiber enters the cyclone separator, the fiber rotates in the cyclone separator, steam can be separated in fiber mass, the fiber and the steam are separated under the action of centrifugal force, the fiber is discharged from the first discharge port 13, and the steam is discharged from the steam outlet 14.

In some embodiments, the fiber sizing system further includes a conveying device 7, the conveying device 7 includes a conveying pipe and a conveying screw, a conveying cavity 71 is disposed on the inner side of the conveying pipe, a fifth feeding hole and a fifth discharging hole are disposed on the conveying pipe, the fifth feeding hole and the fifth discharging hole are both communicated with the conveying cavity 71, the conveying screw is disposed on the inner side of the conveying cavity 71, the conveying screw is rotatably connected with the conveying pipe, the fifth feeding hole and the fifth discharging hole are respectively disposed on two sides of the conveying pipe in the length direction, the fifth feeding hole is communicated with the first discharging hole 13, and the fifth discharging hole is communicated with the second feeding hole 22.

The fiber after the steam separation firstly enters the conveying device 7 and then enters the sizing device 2, the fiber enters the conveying cavity 71 of the conveying pipe, the fiber is conveyed to the sizing device 2 through the conveying screw, and when too many or too few fibers come out from the steam separation device 1, the conveying screw can enable the conveying amount of the fiber to be more uniform, and the uniformity of the fiber sizing amount is improved.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A fiber sizing system, comprising:

2. The fiber sizing system of claim 1, further comprising a temperature reduction device, wherein the temperature reduction device is provided with a temperature reduction cavity, a fourth feed inlet and a fourth discharge outlet, the fourth feed inlet and the fourth discharge outlet are both communicated with the temperature reduction cavity, the fourth feed inlet is communicated with the first discharge outlet, and the fourth discharge outlet is communicated with the second feed inlet.

3. The fiber sizing system according to claim 2, wherein the cooling device comprises a cooling pipe, the cooling cavity is disposed inside the cooling pipe, the fourth feeding hole and the fourth discharging hole are disposed on two sides of the cooling pipe in the length direction, respectively, a cooling screw is disposed in the cooling cavity, an axis of the cooling screw extends along the length direction of the cooling pipe, and the cooling screw is rotatably connected with the cooling pipe.

4. The fiber sizing system of claim 2, wherein the temperature reduction device further comprises water jets, the water jets being in communication with the temperature reduction chamber, the water jets for spraying water to reduce the temperature of the fibers passing through the temperature reduction chamber.

5. The fiber sizing system according to claim 1, wherein the sizing device comprises a vertically arranged breaking pipe, the sizing chamber is arranged on the inner side of the breaking pipe, the second feed inlet and the second discharge outlet are respectively arranged on the upper side and the lower side of the breaking pipe, a breaking spiral is arranged on the inner side of the sizing chamber, the axis of the breaking spiral extends along the length direction of the breaking pipe, the breaking spiral is rotatably connected with the breaking pipe, and the sizing nozzle is arranged on the lower side of the breaking spiral.

6. The fiber sizing system according to claim 1, wherein the drying device comprises a drying tube, the drying cavity is disposed inside the drying tube, the third feeding port and the third discharging port are respectively disposed at two sides of the drying tube in the length direction, the drying tube further comprises a hot air inlet, the hot air inlet and the third discharging port are respectively disposed at two ends of the drying tube, and the third feeding port is disposed at an upper side of a side close to the hot air inlet.

7. A fiber sizing system according to claim 1, wherein the steam outlet is provided with a steam recovery conduit.

8. A fiber sizing system according to claim 7, further comprising a raw stock digester vessel provided with a steam inlet and a sixth outlet, the steam inlet and the steam outlet being in communication through a steam recovery conduit, and a defibrator provided with a seventh inlet and a seventh outlet, the seventh inlet being in communication with the sixth outlet, the seventh outlet being in communication with the first inlet.

9. The fiber sizing system of claim 1, wherein the steam separation device is a cyclone.

10. The fiber sizing system according to claim 1, further comprising a conveying device, wherein the conveying device comprises a conveying pipe and a conveying screw, a conveying cavity is formed inside the conveying pipe, a fifth feeding hole and a fifth discharging hole are formed in the conveying pipe, the fifth feeding hole and the fifth discharging hole are communicated with the conveying cavity, the conveying screw is arranged inside the conveying cavity, the conveying screw is rotatably connected with the conveying pipe, the fifth feeding hole and the fifth discharging hole are respectively arranged on two sides of the conveying pipe in the length direction, the fifth feeding hole is communicated with the first discharging hole, and the fifth discharging hole is communicated with the second feeding hole.