Multi-layer fiber sizing agent desizing furnace

Abstract

This utility model discloses a multi-layer fiber sizing agent desizing furnace, belonging to the field of prepreg processing technology. It includes a furnace body with threading inlets and outlets on two opposite side walls. The furnace interior contains multiple conveying units for conveying multifilament fibers and heating units for baking the multifilament fibers on each conveying unit. The conveying units are arranged in multiple layers along a first direction, forming an S-shaped conveying path on each unit and between adjacent units. The first-layer conveying unit has an inlet end corresponding to the threading inlet position, and the last-layer conveying unit has an outlet end corresponding to the threading outlet position. This utility model, through multi-layer threading, fully utilizes the internal space of the furnace body and effectively reduces the furnace length without reducing the threading speed.

Description

Technical Field

[0001] This utility model relates to the field of prepreg processing technology, and in particular to a multi-layer fiber sizing agent desizing furnace. Background Technology

[0002] In order to ensure the bonding of fibers and protect the fiber morphology, fiber multifilaments are usually impregnated to coat their surface with a sizing agent.

[0003] When processing prepreg products, different types of prepregs require different types of resins. Therefore, it is necessary to desizing the sizing agent on the original fibers during processing. The existing desizing methods mostly adopt the high-temperature incineration method, which involves introducing carbon fiber multifilaments into a desizing furnace and burning off the original sizing agent at a temperature of about 600°C.

[0004] Currently available desizing furnaces are horizontal desizing furnaces, consisting of a furnace body with threading ports on two opposite end faces to allow carbon fiber multifilaments to pass through. However, the internal fiber multifilaments follow a single straight path. To achieve good desizing results, the furnace body needs to be relatively long, resulting in a large footprint and affecting the rational layout of the entire production line within a limited factory space. If the furnace body size is reduced, the threading speed needs to be lowered accordingly, leading to a decrease in production efficiency. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-layer fiber sizing agent desizing furnace. Through a multi-layer fiber feeding method, the internal space of the furnace body is fully utilized without reducing the feeding speed, thereby effectively reducing the length of the furnace body.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A multi-layer fiber sizing agent desizing furnace includes a furnace body with threading inlets and threading outlets on two opposite side walls. The furnace body contains multiple conveying units for conveying multifilament fibers and heating units for baking the multifilament fibers on each conveying unit. The conveying units are arranged in multiple layers along a first direction, forming an S-shaped conveying path on each unit and between adjacent units. The first layer of conveying units has an inlet end corresponding to the threading inlet position, and the last layer of conveying units has an outlet end corresponding to the threading outlet position. By setting multiple conveying units within the furnace body, the multifilament fibers flow in an S-shape within the furnace body. Independent heating units bake the multifilament fibers flowing through each conveying unit at high temperatures, thereby achieving sufficient combustion of the sizing agent on the multifilament fibers while maintaining a constant fiber feed speed. This effectively reduces the length of the furnace body and makes full use of its internal space.

[0007] The first direction is parallel to the height direction of the furnace body, and the number of the conveying units is an odd number greater than or equal to 3.

[0008] Each of the conveying units includes a mounting frame, a reversing guide roller, and intermediate guide rollers. The mounting frame is fixedly installed in the inner cavity of the furnace body. The reversing guide rollers are rotatably installed at opposite ends of the mounting frame of the first layer conveying unit away from the wire threading inlet, the mounting frame of the last layer conveying unit away from the wire threading outlet, and the mounting frame of the intermediate layer conveying unit. There are multiple intermediate guide rollers, which are arranged at intervals along the length of the mounting frame and rotatably installed on the mounting frame.

[0009] The heating unit includes an electric heating tube and spiral fins sleeved on the outside of the electric heating tube. There are multiple electric heating tubes, which are fixed at intervals on the mounting frame along the length of the mounting frame and located below the S-shaped conveying path.

[0010] The mounting frame includes a base plate and two side plates. The base plate is horizontally fixed to the inner cavity of the furnace body, and the two side plates are respectively fixed to the front and rear sides of the base plate, and together with the base plate and the two side walls opposite to the furnace body, they form a collection chamber for collecting the ash of the sizing agent.

[0011] The system includes a traction assembly comprising a reducer fixed to the outside of the furnace body and a traction motor driven by the reducer. The output shaft of the reducer passes through the furnace body and is driven by any of the reversing guide rollers of the middle conveying unit. The traction assembly, driven by the reversing guide rollers, can provide the same linear speed as the preceding yarn unwinding device and the subsequent prepreg winding device, thereby alleviating the significant increase in fiber multifilament tension caused by relative friction when the multifilament changes direction at the reversing guide rollers.

[0012] The heating unit includes an upper infrared heating plate and a lower infrared heating plate, which are fixed side by side vertically on the mounting frame, and the S-shaped conveying path is located between the upper and lower heating plates.

[0013] An inlet guide roller is provided at the wire threading inlet, and an outlet guide roller is provided at the wire threading outlet. The inlet guide roller and the outlet guide roller are fixed to the outside of the furnace body by their respective rotating brackets.

[0014] This utility model has the following beneficial effects: This invention sets up multiple conveying units inside the furnace, allowing the multifilament fibers to flow in an S-shape within the furnace. Independent heating units bake the multifilament fibers flowing through each conveying unit at high temperatures, thereby achieving sufficient combustion of the sizing agent on the multifilament fibers while maintaining a constant yarn feed speed. By fully utilizing the internal space of the furnace, the required length of the furnace body is effectively reduced, thus ensuring a reasonable layout of the entire production line. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a structural schematic diagram of the present invention from another angle; Figure 3 This is a cross-sectional view of the present invention along the width direction; Figure 4 This is a schematic diagram showing the connection between the conveying unit and the heating unit in Example 1; Figure 5 This is a cross-sectional view along the length of the furnace body of the present invention after the heating unit of Embodiment 1 is installed inside the furnace body. Figure 6 This is a schematic diagram showing the connection between the conveying unit and the heating unit in Example 2; Figure 7 This is a cross-sectional view along the length of the furnace body of this utility model after the heating unit of Embodiment 2 is installed.

[0017] 1. Furnace body; 101. Door; 102. Exhaust gas outlet; 103. Temperature control box; 104. Threading inlet; 105. Threading outlet; 2. Conveying unit; 201. Mounting frame; 2011. Side plate; 2012. Base plate; 2013. Connecting plate; 2014. Arc-shaped mounting groove; 202. Intermediate guide roller; 203. Changing guide roller; 203a. Changing guide roller one; 203b. Changing guide roller two; 203c. Changing guide roller 3; 203d, guide roller 4; 203e, guide roller 5; 203f, guide roller 6; 203g, guide roller 7; 203h, guide roller 8; 204, bearing; 3, heating unit; 301, electric heating tube; 302, upper infrared heating plate; 303, lower infrared heating plate; 4, inlet guide roller; 5, outlet guide roller; 6, traction assembly; 601, traction motor; 602, reducer; 7, S-shaped conveyor path. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] like Figure 1 and Figure 2As shown, this utility model provides a multi-layer fiber sizing agent desizing furnace, including a furnace body 1. A threading inlet 104 and a threading outlet 105 are respectively opened on two opposite side walls of the furnace body 1. Similar to the prior art, the furnace body 1 has an inner cavity, an openable door 101 on the front side of the furnace body 1, and a tail gas exhaust port 102 on the top of the furnace body 1, which is connected to the tail gas treatment equipment in the workshop. Unlike the prior art, the inner cavity of the furnace body 1 is provided with multiple conveying units 2 for conveying multifilament fibers and heating units 3 for baking the multifilament fibers on each conveying unit 2. Each heating unit 3 is electrically connected to a temperature control box 103 of the furnace body 1, and a temperature sensor is provided inside the furnace body 1 to monitor the temperature at each conveying unit 2. The temperature control box 103 receives the temperature sensor data. The sensor signal adjusts the output power of the corresponding heating unit 3 to achieve independent baking effect for each heating unit 3; each of the conveying units 2 is arranged in multiple layers along the first direction, and an S-shaped conveying path 7 is formed on each conveying unit 2 and between adjacent conveying units 2. The first layer conveying unit 2 has an inlet end corresponding to the position of the threading inlet 104, and the last layer conveying unit 2 has an outlet end corresponding to the position of the threading outlet 105; the multi-layer arrangement of the above-mentioned conveying units 2 makes the fiber multifilaments flow in an S-shape within the furnace body 1, thereby reducing the length of the furnace body 1 and making full use of the internal space of the furnace body 1. The fiber multifilaments flowing through each conveying unit 2 are baked at high temperature by independent heating units 3. Under the condition that the threading speed remains unchanged, sufficient combustion effect is generated on the sizing agent on the fiber multifilaments to ensure production efficiency.

[0023] Further preferred, such as Figure 5 As shown, the first direction is parallel to the height direction of the furnace body 1, and the number of conveying units 2 is an odd number greater than or equal to 3. Specifically, in this scheme, the wire threading inlet 104 is located at the lower part of the furnace body 1, and the wire threading outlet 105 is located at the upper part of the furnace body 1. The number of layers of conveying units 2 is determined according to the installation area reserved in the factory building. In this scheme, as shown... Figure 5 As shown, the number of conveying units 2 is selected as 5, which are, from bottom to top, the first layer conveying unit 2, the second layer conveying unit 2, the third layer conveying unit 2, the fourth layer conveying unit 2, and the last layer conveying unit 2.

[0024] In order to provide guidance for fiber multifilament at the threading inlet 104 and threading outlet 105 of the furnace body 1, an inlet guide roller 4 is provided at the threading inlet 104 and an outlet guide roller 5 is provided at the threading outlet 105. The inlet guide roller 4 and the outlet guide roller 5 are fixed to the outside of the furnace body 1 by their respective rotating brackets.

[0025] like Figure 4As shown, each of the conveying units 2 includes a mounting frame 201, a reversing guide roller 203, and an intermediate guide roller 202. The mounting frame 201 is fixedly installed in the inner cavity of the furnace body 1. The reversing guide roller 203 is rotatably installed at the opposite ends of the mounting frame 201 of the first layer conveying unit 2 away from the wire threading inlet 104, the opposite end of the mounting frame 201 of the last layer conveying unit 2 away from the wire threading outlet 105, and the opposite ends of the mounting frame 201 of the intermediate layer (second, third, and fourth layers in this scheme) conveying units 2. For ease of description, as shown... Figure 5 As shown, the aforementioned guide rollers 203 are sequentially defined as follows: guide roller 1 203a on the first layer conveying unit 2, guide roller 2 203b and guide roller 3 203c on the second layer conveying unit 2, guide roller 4 203d and guide roller 5 203e on the third layer conveying unit 2, guide roller 6 203f and guide roller 7 203g on the fourth layer conveying unit 2, and guide roller 8 203h on the last layer conveying unit 2; and after the fiber multifilament enters through the threading inlet 104, it sequentially passes around the guide rollers 203a and 203c on the third layer conveying unit 2, and guide roller 4 203d and guide roller 5 203e on the fourth layer conveying unit 2, guide roller 6 203f and guide roller 7 203g on the fourth layer conveying unit 2, and guide roller 8 203h on the last layer conveying unit 2; and after the fiber multifilament enters through the threading inlet 104, it sequentially passes around the guide rollers 203a and 203c on the fourth layer conveying unit 2, and guide roller 7 203g on the fifth ..., guide roller 8 203h on the fifth layer conveying unit 2, guide roller 9 203d and guide roller 103e on the fourth layer conveying unit 2, guide roller 103d and guide roller After passing through guide roller 1 203a, guide roller 2 203b, guide roller 3 203c, guide roller 4 203d, guide roller 5 203e, guide roller 6 203f, guide roller 7 203g, and guide roller 8 203h, the fiber multifilaments pass through the threading outlet 105 and exit the furnace body 1. There are multiple intermediate guide rollers 202, which are arranged at intervals along the length of the mounting frame 201 and rotated on the mounting frame 201. The fiber multifilaments are in contact with the surface of each intermediate guide roller 202 along the S-shaped conveying path.

[0026] Specifically, the mounting frame 201 includes a base plate 2012 and two side plates 2011. The base plate 2012 is horizontally fixed to the inner cavity of the furnace body 1. The two side plates 2011 are respectively fixed to the front and rear sides of the base plate 2012, and together with the base plate 2012 and the two side walls opposite to the furnace body 1, they form a collection chamber for collecting the ash of the sizing agent. Figure 4 As shown, each of the aforementioned reversing guide rollers 203 is located between two side plates 2011, and both ends of the reversing guide rollers 203 pass through the side plates 2011 and are rotatably connected to the side plates 2011 via bearings 204. The intermediate guide roller 202 is detachably mounted on the side plate 2011. Specifically, the side plate 2011 may be provided with an arc-shaped mounting groove 2014. The rotating shaft end of the intermediate guide roller 202 is placed in the arc-shaped mounting groove 2014 and can rotate relative to the arc-shaped mounting groove 2014. By removing the intermediate guide roller 202, cleaning tools, such as a vacuum hose, can be used to clean the collection chamber below and around the intermediate guide roller 202.

[0027] like Figure 4As shown, the heating unit 3 in Embodiment 1 includes an electric heating tube 301 and a spiral fin sleeved on the outside of the electric heating tube 301. There are multiple electric heating tubes 301, which are fixed at intervals on the mounting frame 201 along the length direction of the mounting frame 201 and located below the S-shaped conveying path.

[0028] like Figure 7 As shown, the heating unit 3 in Embodiment 2 includes an upper infrared heating plate 302 and a lower infrared heating plate 303. The upper infrared heating plate 302 and the lower infrared heating plate 303 are fixed side by side vertically on the mounting frame 201, and the S-shaped conveying path 7 is located between the upper heating plate and the lower heating plate. Figure 6 As shown, in this specific embodiment, the lower infrared heating plate 303 is located between the two side plates 2011 of the mounting bracket 201 and is fixed to the side plates 2011 with screws. The upper infrared heating plate 302 is fixed to the top of the two side plates 2011 by the connecting plate 2013. Compared with the electric heating tube 301, the infrared heating plate has a more uniform heating temperature, and the ash of the sizing agent after incineration mostly falls on the quartz glass surface of the lower infrared heating plate 303, which is easy to clean.

[0029] Because the multifilament fiber needs to pass through multiple guide rollers 203 inside the furnace 1 to change its conveying direction, there will be close friction between the multifilament fiber and the guide rollers 203. This will cause the tension of the multifilament fiber to increase significantly after it exits from the threading outlet 105. To alleviate this phenomenon, such as Figure 2 and Figure 3 As shown, the outer side of the furnace body 1 also includes a traction assembly 6. Specifically, the traction assembly 6 includes a reducer 602 fixed to the outer side of the furnace body 1 and a traction motor 601 driven by the reducer 602. The transmission connection between the traction motor 601 and the reducer 602 is achieved through a reduction gear set. The output shaft of the reducer 602 passes through the furnace body 1 and is driven by any of the guide rollers of the intermediate layer conveying unit 2. The above transmission connection can be achieved by a coupling (not shown in the figure). More preferably, there are multiple traction assemblies, the number of which is the same as the number of intermediate layer conveying units 2. The quantities are the same. Specifically, in this scheme, there are three traction components 6, which are referred to from bottom to top as traction component one, traction component two (not shown in the figure) and traction component three. The output shaft of the reducer 602 of traction component one is connected to the reversing guide roller two 203b, the output shaft of the reducer 602 of traction component two is connected to the reversing guide roller four 203d, and the output shaft of the reducer 602 of traction component three is connected to the reversing guide roller six 203f. Each traction component 6 provides the same linear speed as the yarn unwinding device in the previous process and the prepreg winding device in the subsequent process, thereby balancing the tension generated by the fiber multifilament due to reversal.

[0030] Based on the area of ​​the workshop of the company purchasing the production line, and on the premise of ensuring a reasonable layout of the entire prepreg production line, the maximum length of the desizing furnace that can be installed is determined, and the number of conveying unit 2 layers in the furnace body 1 is determined according to the length. The fiber multifilament is conveyed in an S-shape in the furnace body 1, and each layer is in a high-temperature environment where the sizing agent can be burned, so as to ensure that the sizing agent on the fiber multifilament is completely burned at the predetermined yarn feeding speed, thereby ensuring the production efficiency of the production line.

[0031] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A multi-layer fiber sizing agent desizing furnace, comprising a furnace body, wherein a threading inlet and a threading outlet are respectively provided on two opposite side walls of the furnace body, characterized in that, The furnace body is provided with multiple conveying units for conveying fiber multifilaments and heating units for baking the fiber multifilaments on each conveying unit. Each conveying unit is arranged in multiple layers along a first direction, and an S-shaped conveying path is formed on each conveying unit and between adjacent conveying units. The first layer conveying unit has an inlet end corresponding to the threading inlet position, and the last layer conveying unit has an outlet end corresponding to the threading outlet position.

2. The multi-layer fiber sizing agent desizing furnace according to claim 1, characterized in that, The first direction is parallel to the height direction of the furnace body, and the number of the conveying units is an odd number greater than or equal to 3.

3. The multi-layer fiber sizing agent desizing furnace according to claim 1 or 2, characterized in that, Each of the conveying units includes a mounting frame, a reversing guide roller, and intermediate guide rollers. The mounting frame is fixedly installed in the inner cavity of the furnace body. The reversing guide rollers are rotatably installed at opposite ends of the mounting frame of the first layer conveying unit away from the wire threading inlet, the mounting frame of the last layer conveying unit away from the wire threading outlet, and the mounting frame of the intermediate layer conveying unit. There are multiple intermediate guide rollers, which are arranged at intervals along the length of the mounting frame and rotatably installed on the mounting frame.

4. The multi-layer fiber sizing agent desizing furnace according to claim 1 or 2, characterized in that, The heating unit includes an electric heating tube and spiral fins sleeved on the outside of the electric heating tube. There are multiple electric heating tubes, which are fixed at intervals on the mounting frame along the length of the mounting frame and located below the S-shaped conveying path.

5. The multi-layer fiber sizing agent desizing furnace according to claim 3, characterized in that, The mounting frame includes a base plate and two side plates. The base plate is horizontally fixed to the inner cavity of the furnace body, and the two side plates are respectively fixed to the front and rear sides of the base plate, and together with the base plate and the two side walls opposite to the furnace body, they form a collection chamber for collecting the ash of the sizing agent.

6. The multi-layer fiber sizing agent desizing furnace according to claim 3, characterized in that, The system includes a traction assembly, which comprises a speed reducer fixed to the outside of the furnace body and a traction motor connected to the speed reducer. The output shaft of the speed reducer passes through the furnace body and is connected to any of the guide rollers of the middle conveying unit.

7. The multi-layer fiber sizing agent desizing furnace according to claim 1 or 2, characterized in that, The heating unit includes an upper infrared heating plate and a lower infrared heating plate, which are fixed side by side vertically on the mounting frame, and the S-shaped conveying path is located between the upper and lower heating plates.

8. The multi-layer fiber sizing agent desizing furnace according to claim 1, characterized in that, An inlet guide roller is provided at the wire threading inlet, and an outlet guide roller is provided at the wire threading outlet. The inlet guide roller and the outlet guide roller are fixed to the outside of the furnace body by their respective rotating brackets.

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