Raw material mixing device for fiberboard production

Abstract

The invention provides a raw material mixing device for fiberboard production, and relates to the technical field of raw material mixing. The raw material mixing device for fiberboard production comprises a base, a material mixing barrel and a stirring assembly. The mixing barrel is rotationally arranged on the base; the stirring assembly comprises a stirring shaft and a secondary driving assembly. The stirring shaft is rotationally arranged in the mixing barrel, a stirring blade group is arranged on the stirring shaft, and the axis of the stirring shaft is perpendicular to the axis of the mixing barrel. The secondary driving assembly comprises a gear ring, a driven gear, a rotating shaft, a connecting frame and a transmission mechanism. And the gear ring is positioned on the outer side of the mixing barrel and is coaxial with the mixing barrel. And the base is fixedly connected with the gear ring. The connecting frame is arranged on the mixing barrel, and the rotating shaft is rotationally arranged on the connecting frame. The driven gear fixedly sleeves the rotating shaft and is meshed with the tooth surface of the gear ring, and the transmission mechanism is used for enabling the rotating shaft to drive the stirring shaft to rotate. The mixing efficiency can be further improved, meanwhile, the problems of material accumulation and the like can be avoided, and the mixing effect is improved.

Description

Technical Field

[0001] This invention relates to the field of raw material mixing technology, and more specifically, to a raw material mixing apparatus for fiberboard production. Background Technology

[0002] As an important environmentally friendly building material, the production quality of fiberboard highly depends on the uniformity of the mixing of raw materials (wood fiber, adhesives, additives, etc.). Traditional mixing equipment often uses fixed mixing tanks or a single rotating cylinder structure. When the static stirring shaft is coaxial with the cylinder, material tends to form stagnant zones at the cylinder edge, leading to wood fiber agglomeration or uneven adhesive distribution. Chinese patent document CN221536415U discloses a double-cone mixer for graphite column production, which includes a base and a double-cone mixing cylinder disposed above the base. A first support seat and a second support seat are fixedly connected to both sides of the top of the base, and a drive cylinder is fixedly connected to the top of the first support seat through an opening. This double-cone mixer for graphite column production uses a motor to drive a rotating rod, which in turn drives multiple agitator plates to agitate the graphite powder inside the double-cone mixing cylinder via an agitator sleeve. Simultaneously, the rotating rod drives a driven gear via a drive gear, which in turn drives an annular plate to rotate in the same direction via ring teeth. The annular plate then drives the double-cone mixing cylinder to rotate, causing the double-cone mixing cylinder and the multiple agitator plates to rotate in opposite directions. This effectively agitates the raw materials inside the double-cone mixing cylinder, saving mixing time and improving mixing efficiency. However, in the aforementioned disclosed prior art:

[0003] 1. In this technical solution, the double-cone mixing cylinder and multiple agitator plates are coaxially arranged, thus creating a reverse circulation of the inner and outer fluids. Significant turbulence forms at the interface between the inner and outer fluids, causing intense friction and tearing of the material layer, thereby completing the mixing process. During this process, the inner and outer fluids move circumferentially, and the force can be considered as radial shearing. Therefore, during mixing, the fluids are accelerated and dispersed at the interface to achieve uniform diffusion and mixing. This is a symmetrical laminar mixing method; although efficiency is improved, further improvements are needed.

[0004] 2. In this technical solution, when the double-cone mixing cylinder and multiple agitator plates are coaxially arranged, material accumulation at the ends of the double-cone mixing cylinder may occur during the mixing process; it is also prone to forming a laminar boundary layer. These problems will result in some raw materials not being effectively mixed during the mixing process, reducing the mixing effect. Summary of the Invention

[0005] The purpose of this invention is to provide a raw material mixing device for fiberboard production, which can further improve mixing efficiency and avoid problems such as material accumulation, thereby improving the mixing effect.

[0006] The embodiments of the present invention are implemented as follows:

[0007] This application provides a raw material mixing device for fiberboard production, including a base, a mixing cylinder, and a stirring assembly. The mixing cylinder is rotatably mounted on the base, and the stirring assembly includes:

[0008] A stirring shaft is rotatably mounted inside the mixing cylinder. The stirring shaft is equipped with a set of stirring blades, and the axis of the stirring shaft is perpendicular to the axis of the mixing cylinder.

[0009] A secondary drive assembly includes a gear ring, a driven gear, a rotating shaft, a connecting frame, and a transmission mechanism. The gear ring is located outside the mixing cylinder and is coaxial with the mixing cylinder. The base is fixedly connected to the gear ring. The connecting frame is disposed on the mixing cylinder. The rotating shaft is rotatably disposed on the connecting frame. The driven gear is fixedly sleeved on the rotating shaft and meshes with the tooth surface of the gear ring. The transmission mechanism is used to drive the stirring shaft to rotate.

[0010] In some embodiments of the present invention, the transmission mechanism described above includes two bevel gears that can cooperate with each other. One bevel gear is sleeved on the stirring shaft, and the other bevel gear is sleeved on the rotating shaft. The two bevel gears mesh with each other.

[0011] In some embodiments of the present invention, the stirring shaft described above is mounted on the mixing cylinder via a first bearing, wherein the first bearing is a sealed bearing structure.

[0012] In some embodiments of the present invention, one end of the mixing cylinder is connected to a connecting shaft, and the connecting shaft is rotatably mounted on the base.

[0013] In some embodiments of the present invention, a driven wheel is sleeved on the connecting shaft, a driving wheel is rotatably mounted on the base, the driving wheel is connected to a drive motor for driving the driving wheel to rotate, and a transmission belt is wound between the driven wheel and the driving wheel.

[0014] In some embodiments of the present invention, the mixing cylinder described above has a double-conical structure.

[0015] In some embodiments of the present invention, the above-mentioned stirring blade assembly includes a plurality of stirring blades, which are sequentially and evenly spaced on the stirring shaft.

[0016] In some embodiments of the present invention, the two ends of the mixing cylinder are coaxially connected to an inlet pipe and an outlet pipe, respectively, and the inlet pipe and the outlet pipe are rotatably connected to the two ends of the mixing cylinder.

[0017] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0018] This invention provides a raw material mixing device for fiberboard production. In this device, the axis of the stirring shaft is perpendicular to the axis of the mixing cylinder. When the stirring blades on the stirring shaft rotate with the shaft, and the mixing cylinder rotates around its axis, the raw materials experience three-dimensional asymmetric shearing, meaning the convection generated is three-dimensional. Compared to existing devices where the axis of the stirring shaft and the axis of the mixing cylinder are the same, resulting in convection only in the tangential direction, the fluid within the mixing cylinder of this invention generates a more three-dimensional convective mixing effect. This leads to better dispersion of fiber components and improved diffusion efficiency of viscous colloids and other raw materials. Therefore, it further enhances the diffusion mixing efficiency of the raw materials. Furthermore, from an overall perspective, the flow of raw materials in this device is three-dimensionally dispersed, forming migratory convection along the axis of the mixing cylinder. The perpendicular stirring shaft propels the raw materials to migrate along the axis of the mixing cylinder, solving the problem of material accumulation at the ends when the stirring shaft and mixing cylinder are coaxially arranged. Furthermore, when the stirring shaft and mixing cylinder are coaxially arranged, a velocity difference occurs between the fluid raw materials inside and outside the existing mixing cylinder, resulting in a laminar boundary layer formed on the inner wall of the mixing cylinder from a macroscopic perspective. However, in this invention, the rotation trajectory of the stirring blade assembly is orthogonal to the revolution trajectory of the mixing cylinder, causing the laminar boundary layer to be periodically torn apart, preventing the formation of an effective laminar boundary layer. This significantly improves the mixing effect. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention 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.

[0020] Figure 1 This is a three-dimensional contour diagram of an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the installation structure of the transmission mechanism in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the pulley mechanism in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of an embodiment of the present invention;

[0024] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0025] Figure 6This is a schematic diagram of the installation structure of the pulley mechanism in an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the installation structure of the feed pipe in an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the installation structure of the discharge pipe in an embodiment of the present invention;

[0028] Figure 9 This is a schematic diagram of the structure of the first bearing cover in an embodiment of the present invention.

[0029] Icons: 1-Base; 2-Mixing cylinder; 3-Agitating shaft; 4-Agitating blade; 5-Gear ring; 6-Driven gear; 7-Rotating shaft; 8-Connecting frame; 9-Bevel gear; 10-First bearing; 11-First bearing cover; 12-Connecting shaft; 13-Second bearing; 14-Driven wheel; 15-Driving wheel; 16-Drive motor; 17-Transmission belt; 19-Infeed pipe; 20-Outfeed pipe; 22-Third bearing; 23-Third short shaft; 24-Fourth bearing; 25-Fourth short shaft. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the 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 invention without inventive effort are within the scope of protection of the invention.

[0032] Example

[0033] Please refer to Figures 1-9This embodiment provides a raw material mixing device for fiberboard production, including a base 1, a mixing cylinder 2, and a stirring assembly. The mixing cylinder 2 is rotatably mounted on the base 1. The stirring assembly includes a stirring shaft 3 and a secondary drive assembly. The stirring shaft 3 is rotatably mounted inside the mixing cylinder 2 and has a set of stirring blades. The axis of the stirring shaft 3 is perpendicular to the axis of the mixing cylinder 2. The secondary drive assembly includes a gear ring 5, a driven gear 6, a rotating shaft 7, a connecting frame 8, and a transmission mechanism. The gear ring 5 is located outside the mixing cylinder 2 and is coaxial with it. The base 1 is fixedly connected to the gear ring 5. The connecting frame 8 is mounted on the mixing cylinder 2, and the rotating shaft 7 is rotatably mounted on the connecting frame 8. The driven gear 6 is fixedly sleeved on the rotating shaft 7 and meshes with the tooth surface of the gear ring 5. The transmission mechanism is used to drive the rotating shaft 7 to rotate the stirring shaft 3.

[0034] As can be seen from the above structure, the base 1 is used to install and support other components. Fiberboard raw materials are added to the mixing cylinder 2 for mixing. The purpose is to provide a place for uniform mixing of fiberboard and adhesive materials. The aforementioned stirring assembly is used to stir, driving the fiberboard and adhesive materials to move, thus enabling them to mix effectively. In this fiberboard production raw material mixing device, the axis of the stirring shaft 3 is perpendicular to the axis of the mixing cylinder 2. When the stirring blades on the stirring shaft 3 rotate with the stirring shaft 3, and the mixing cylinder 2 rotates around its axis, the raw materials will experience three-dimensional asymmetric shearing, meaning the convection generated by the raw materials is three-dimensional. Compared to existing systems where the axis of the stirring shaft 3 is the same as the axis of the mixing cylinder 2, resulting in convection only in the tangential direction, the fluid in the mixing cylinder 2 of this embodiment will generate a more three-dimensional convective mixing effect. Thus, the dispersion effect of the fiber components will be better, and the diffusion efficiency of adhesive materials will also be improved. Therefore, it can further improve the diffusion mixing efficiency of the raw materials.

[0035] Furthermore, from an overall perspective, the flow of raw materials in this embodiment is three-dimensionally dispersed, and migratory convection is formed along the axis of the mixing cylinder 2. The vertical stirring shaft 3 pushes the raw materials to migrate along the axis of the mixing cylinder 2, solving the problem of material accumulation at the end when the stirring shaft 3 and the mixing cylinder 2 are coaxially arranged. In addition, when the stirring shaft 3 and the mixing cylinder 2 are coaxially arranged, the existing flow of raw materials on the inner and outer sides of the mixing cylinder 2 will form a velocity difference, and macroscopically, the raw materials form a laminar boundary layer on the inner wall of the mixing cylinder 2. However, in this invention, the rotation trajectory of the stirring blade assembly is orthogonal to the revolution trajectory of the mixing cylinder 2, and the laminar boundary layer is periodically torn apart, preventing the formation of an effective laminar boundary layer. Thus, the mixing effect can be greatly improved.

[0036] Specifically, in this embodiment, after the mixing cylinder 2 rotates, it also drives the connecting frame 8 to rotate circumferentially. This drives the driven gear 6 and the rotating shaft 7 on the connecting frame 8 to revolve around its circumference. During this revolution, because the driven gear 6 meshes with the gear ring 5, the driven gear 6 and the rotating shaft 7 also rotate on their own axis. During this rotation, the rotating shaft 7 drives the stirring shaft 3 to rotate via a transmission mechanism. This causes the stirring shaft 3 to drive the stirring blade assembly on it to rotate. The rotating mixing cylinder 2 causes the raw materials inside to rotate horizontally, while the stirring blade assembly causes the raw materials to rotate vertically, resulting in a more three-dimensional convective mixing effect in the mixing cylinder 2. As described above, the stirring shaft 3 and the mixing cylinder 2 are essentially driven together, saving space, reducing energy consumption, and simplifying the structure. Furthermore, driving the stirring shaft 3 through the rotation of the mixing cylinder 2 avoids the problem of cables and other external components becoming entangled in the mixing cylinder 2, which can occur when the stirring shaft 3 uses a separate drive source.

[0037] Please refer to Figures 2-5 In some application scenarios of this embodiment, the axis of the stirring shaft 3 and the axis of the mixing cylinder 2 are located in the same plane and are perpendicular to each other. The transmission mechanism specifically includes two bevel gears 9 that can cooperate with each other. One bevel gear 9 is sleeved on the stirring shaft 3, and the other bevel gear 9 is sleeved on the rotating shaft 7, with the two bevel gears 9 meshing with each other. After the two bevel gears 9 mesh, rotation of the rotating shaft 7 will cause the two bevel gears 9 to rotate relative to each other, thereby driving the stirring shaft 3 to rotate. In other embodiments, the transmission mechanism can also be other mechanisms that can satisfy the transmission connection between the stirring shaft 3 and the rotating shaft 7; all are acceptable.

[0038] Please refer to Figures 2-5 In this embodiment, the stirring shaft 3 is mounted on the mixing cylinder 2 via a first bearing 10, which is a sealed bearing structure. Specifically, the first bearing 10 is installed on the mixing cylinder 2, and the stirring shaft 3 passes through the first bearing 10. To prevent leakage of the raw material inside the mixing cylinder 2 along the shaft and between the shaft and the first bearing 10, the first bearing 10 is a sealed bearing structure, which effectively prevents raw material leakage. Specifically, the sealed first bearing 10 actually has a first bearing cover 11 (see reference). Figure 9 The first bearing cover 11 is welded to the mixing cylinder 2 and is sleeved on the stirring shaft 3. A bearing seal ring is provided between the first bearing cover 11 and the stirring shaft 3 for sliding sealing, that is, the stirring shaft 3 will slide relative to the bearing seal ring during rotation, and the bearing seal ring can also play a sealing role.

[0039] Please refer to Figure 3 , Figure 4 and Figure 6In some embodiments of this example, one end of the mixing cylinder 2 is connected to a connecting shaft 12, which is rotatably mounted on the base 1. The connecting shaft 12 is mainly used to enable the mixing cylinder 2 to rotate on the base 1. The mixing cylinder 2 and the connecting shaft 12 are coaxially connected, and the connecting shaft 12 is rotatably mounted on the base 1 using a second bearing 13.

[0040] Please refer to Figure 6 Furthermore, in this embodiment, a driven wheel 14 is sleeved on the connecting shaft 12. A driving wheel 15 is rotatably mounted on the base 1, and a drive motor 16 is connected to the driving wheel 15 to drive its rotation. A transmission belt 17 is wound between the driven wheel 14 and the driving wheel 15. The driving wheel 15, the driven wheel 14, and the transmission belt 17 form a pulley mechanism. After the driving wheel 15 is driven to rotate by the drive motor 16, the driven wheel 14 is driven to rotate by the transmission belt 17, thereby driving the connecting shaft 12 on the driven wheel 14 to rotate.

[0041] In some embodiments of this example, the mixing cylinder 2 has a double-conical structure. The double-conical structure of the mixing cylinder 2 allows the raw materials at both ends to move towards the stirring blade assembly in the middle of the mixing cylinder 2 under centrifugal force during rotation, thereby further improving the mixing effect.

[0042] In this embodiment, the aforementioned stirring blade assembly includes multiple stirring blades 4, which are sequentially and evenly spaced on the stirring shaft 3. The dimensions of the multiple stirring blades 4 are adapted to the dimensions of the mixing cylinder 2. The multiple stirring blades can further enhance the mixing effect of the raw materials.

[0043] Please refer to Figure 7 In some embodiments of this example, the mixing cylinder 2 is coaxially connected to an inlet pipe 19 and an outlet pipe 20 at both ends, respectively. The inlet pipe 19 and the outlet pipe 20 are rotatably connected to both ends of the mixing cylinder 2. The inlet pipe 19 is used to feed the raw materials that have been initially mixed in proportion, and the outlet pipe 20 is used to discharge the raw materials that have been further mixed in the mixing cylinder 2. The rotatable connection between the inlet pipe 19 and the outlet pipe 20 and both ends of the mixing cylinder 2 ensures that the inlet pipe 19 or the outlet pipe 20 is connected to the mixing cylinder 2. At the same time, the rotation of the mixing cylinder 2 will not cause the inlet pipe 19 and the outlet pipe 20 to rotate, thus preventing the inlet pipe 19 and the outlet pipe 20 from being twisted, deformed, or damaged under torque.

[0044] Please refer to Figure 7Specifically, in this embodiment, a first connector is provided between the feed pipe 19 and the mixing cylinder 2. The first connector includes a third bearing 22 and a third short shaft 23. The third bearing 22 is coaxially disposed at the top of the mixing cylinder 2, and the third short shaft 23 passes through and cooperates with the third bearing 22. The third short shaft 23 has a hollow shaft structure. One end of the third short shaft 23 extends into the mixing cylinder 2 and communicates with the mixing cylinder 2, and the other end communicates with the feed pipe 19. During the rotation of the mixing cylinder 2, the third short shaft 23 rotates relative to the third bearing 22, which realizes the rotational connection between the feed pipe 19 and the mixing cylinder 2, and also ensures the communication between the feed pipe 19 and the mixing cylinder 2.

[0045] Please refer to Figure 8 Similarly, in this embodiment, a second connector is provided between the discharge pipe 20 and the mixing cylinder 2. The second connector includes a fourth bearing 24 and a fourth short shaft 25. The connecting shaft 12 is a hollow shaft structure, with one end connected to the bottom of the mixing cylinder 2. The fourth bearing 24 is coaxially mounted on the connecting shaft 12. The fourth short shaft 25 passes through the fourth bearing 24 and extends into the connecting shaft 12. The fourth short shaft 25 is a hollow shaft structure, with one end connected to the connecting shaft 12 and the other end connected to the discharge pipe 20. During the rotation of the mixing cylinder 2, it is actually the connecting shaft 12 that rotates. The rotation of the fourth short shaft 25 relative to the fourth bearing 24 enables the rotational connection between the discharge pipe 20 and the connecting shaft 12, and also indirectly enables the rotational connection between the discharge pipe 20 and the mixing cylinder 2. Simultaneously, the hollow shaft structure of both the connecting shaft 12 and the fourth short shaft 25 ensures the indirect connection between the feed pipe 19 and the mixing cylinder 2. One end of the aforementioned fourth short shaft 25 extends into and communicates with the connecting shaft 12. To prevent material leakage, a sealing structure (not shown in the figure) is provided between the fourth short shaft 25 and the connecting shaft 12 to prevent material leakage. This sealing structure is specifically an existing sliding sealing ring structure, which will not be described further here. If there is any unclear information, please refer to existing technology.

[0046] It should be noted that, in this embodiment, the aforementioned gear ring 5 can be an internal gear structure or an external gear structure. When an internal gear structure is used, the driven gear 6 is located between the gear ring 5 and the mixing cylinder 2; when an external gear structure is used, the gear ring 5 is located between the driven gear 6 and the mixing cylinder 2.

[0047] In other embodiments, the mixing cylinder 2 is a vacuum cylinder structure, and the mixing process can be carried out under vacuum, which can effectively avoid problems such as air bubbles during the mixing process, thus affecting the quality of the finished product.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A raw material mixing device for fiberboard production, comprising a base, a mixing cylinder, and a stirring assembly, characterized in that, The mixing cylinder is rotatably mounted on the base, and the stirring assembly includes: A stirring shaft is rotatably mounted inside the mixing cylinder. The stirring shaft is equipped with a set of stirring blades, and the axis of the stirring shaft is perpendicular to the axis of the mixing cylinder. A secondary drive assembly includes a gear ring, a driven gear, a rotating shaft, a connecting frame, and a transmission mechanism. The gear ring is located outside the mixing cylinder and is coaxial with the mixing cylinder. The base is fixedly connected to the gear ring. The connecting frame is disposed on the mixing cylinder. The rotating shaft is rotatably disposed on the connecting frame. The driven gear is fixedly sleeved on the rotating shaft and meshes with the tooth surface of the gear ring. The transmission mechanism is used to drive the stirring shaft to rotate.

2. The raw material mixing device for fiberboard production according to claim 1, characterized in that, The transmission mechanism includes two bevel gears that can cooperate with each other. One bevel gear is sleeved on the stirring shaft, and the other bevel gear is sleeved on the rotating shaft. The two bevel gears mesh with each other.

3. The raw material mixing device for fiberboard production according to claim 1, characterized in that, The stirring shaft is mounted on the mixing cylinder via a first bearing, which is a sealed bearing structure.

4. The raw material mixing device for fiberboard production according to claim 1, characterized in that, One end of the mixing cylinder is connected to a connecting shaft, which is rotatably mounted on the base.

5. The raw material mixing device for fiberboard production according to claim 4, characterized in that, A driven wheel is sleeved on the connecting shaft, and a driving wheel is rotatably mounted on the base. The driving wheel is connected to a drive motor for driving the driving wheel to rotate, and a transmission belt is wound between the driven wheel and the driving wheel.

6. The raw material mixing device for fiberboard production according to claim 1, characterized in that, The mixing cylinder has a double-conical structure.

7. The raw material mixing device for fiberboard production according to claim 1, characterized in that, The stirring blade assembly includes multiple stirring blades, which are sequentially and evenly spaced on the stirring shaft.

8. The raw material mixing device for fiberboard production according to claim 1, characterized in that, The mixing cylinder has a feed pipe and a discharge pipe coaxially connected to its two ends, and the feed pipe and the discharge pipe are rotatably connected to the two ends of the mixing cylinder.

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