Fiber mixing and uniform distribution device

Abstract

The invention relates to a fiber mixing and uniform distribution device. The device comprises a main channel, an auxiliary channel, a speed reduction plate and a controller, a fiber inlet for feeding fibers is formed in the upper end of the main channel, and a main discharge port is formed in the lower end of the main channel; one end of the auxiliary channel is provided with a feed port for feeding granules, and the other end of the auxiliary channel is provided with an auxiliary discharge port, is communicated with the main channel and is used for introducing the granules into the main channel; the width of the main channel below the auxiliary discharge port is greater than that of the main channel above the auxiliary discharge port; the speed reduction plate is used for increasing the opening size of the main discharge hole; the controller controls the speed reduction plate to rotate. The main channel induces airflow diffusion to generate disturbance through variable-diameter arrangement, so that the random dispersion effect of the fibers is intensified, and the particles and the fibers can be randomly and uniformly impacted and wrapped in the main channel. And after the mixed material reaches a horn mouth area formed by the speed reduction plate, the fibers and the granules which are wrapped together are separated, and finally the uniformly distributed loose fibers and the uniformly distributed granules are formed.

Description

Technical Field

[0001] The invention relates to the technical field of nonwoven fabrics, and more particularly to a fiber mixing and uniform distribution device. Background Art

[0002] Common diaper cores and some non-woven wipes in daily life are made by mixing short fibers (including wood pulp fibers, bamboo fibers, chemical fibers, etc.) with absorbent resin particles. Existing devices for producing such products have problems such as low output and poor mixing performance (mainly manifested in fiber agglomeration and uneven particle distribution). Therefore, how to make the fiber and particle materials mix more evenly is the technical problem to be solved by this application. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention proposes a fiber mixing and uniform distribution device, which generates disturbances through air flow expansion and pressure, and a trumpet-shaped injection port structure to allow the mixed materials to be mixed more evenly.

[0004] The present invention provides a fiber mixing and uniform distribution device, and the technical solution is as follows: A fiber mixing and uniform distribution device, comprising a main channel, a secondary channel, a speed reduction plate and a controller; The upper end of the main channel is formed with a fiber inlet for feeding fibers, and the lower end is formed with a main discharge port; A feed port for feeding granular materials is formed at one end of the secondary channel, and a secondary discharge port is formed at the other end and is connected to the main channel for feeding granular materials into the main channel; The width of the main channel below the secondary discharge port is greater than the width of the main channel above the secondary discharge port; There are two speed reduction plates, which are rotatably connected to both sides of the main discharge port to increase the opening size of the main discharge port; The controller is connected to the speed reduction plates and is used to control the rotation of the two speed reduction plates, thereby changing the size of the opening between the two speed reduction plates.

[0005] In summary, the above technical solution has the following beneficial effects: the fiber inlet of the main channel of the present application is used to connect the outlet of the short fiber generating device (such as an opener, a crusher, etc.), and the feed port of the secondary channel is used to connect the discharge port of the weighing type feeding device. The mass of the fiber is less than the mass of the granular material. The fiber and the granular material are mixed in the main channel and discharged from the main discharge port together. The main channel is set with a variable diameter to induce airflow expansion to produce disturbances, thereby aggravating the random dispersion of the fiber, so that the granular material can be randomly and evenly impacted and entrained with the fiber in the main channel. After the mixed material reaches the bell-shaped area formed by the deceleration plate, the deceleration plate increases the size of the main discharge port. According to the Bernoulli equation, the airflow decelerates, and the light-weight fiber immediately follows the deceleration. However, the particles with higher density decrease in speed more slowly than the airflow and fibers due to inertia, thereby separating the entrained fibers and granular materials, and finally forming evenly distributed loose fibers and evenly distributed granular materials in the bell-shaped area formed by the deceleration plate. Thereby, the problems of fiber agglomeration and uneven particles that often occur in the industry are avoided as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the main channel of a fiber mixing and uniform distribution device; Figure 2 A schematic diagram of a controller for a fiber mixing and uniform distribution device; Figure 3 A schematic diagram of a speed reduction plate of a fiber mixing and uniform distribution device; Figure 4 A schematic diagram of ventilation holes in a fiber mixing and uniform distribution device.

[0007] Figure numerals: 10, main channel; 11, fiber inlet; 12, main outlet; 20, secondary channel; 21, feed port; 22, secondary outlet; 30, speed reduction plate; 31, protrusion; 32, ventilation hole; 33, sliding rod; 34, fixed edge; 35, sealing disc; 36, sealing ring; 37, sliding plate; 40, controller; 50, air flow channel; 51, air inlet; 52, air outlet; 60, base; 61, cross bar. DETAILED DESCRIPTION

[0008] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments. 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 creative work are within the scope of protection of the present invention.

[0009] like Figure 1 and Figure 2As shown, a fiber mixing and uniform distribution device includes a main channel 10, a secondary channel 20, a speed reduction plate 30 and a controller 40; a fiber inlet 11 for feeding fibers is formed at the upper end of the main channel 10, and a main discharge port 12 is formed at the lower end; a feed port 21 for feeding granular materials is formed at one end of the secondary channel 20, and a secondary discharge port 22 is formed at the other end and is connected to the main channel 10, for introducing granular materials into the main channel 10; the width of the main channel 10 below the secondary discharge port 22 is greater than the width of the main channel 10 above the secondary discharge port 22; there are two speed reduction plates 30, which are rotatably connected to the two sides of the main discharge port 12 respectively, for increasing the opening size of the main discharge port 12; the controller 40 is connected to the speed reduction plates 30, for controlling the rotation of the two speed reduction plates 30, thereby changing the opening size between the two speed reduction plates 30. The fiber inlet 11 of the main channel 10 of the present application is used to connect to the outlet of the short fiber generating device (such as an opener, a crusher, etc.), and the feed port 21 of the secondary channel 20 is used to connect to the discharge port of the weighing type feeding device. The mass of the fiber is less than the mass of the granular material. The fiber and the granular material are mixed in the main channel 10 and discharged from the main discharge port 12 together. The main channel 10 is set with a variable diameter to induce the airflow to expand and produce disturbances, thereby aggravating the random dispersion of the fiber, so that the granular material can be randomly and evenly impacted and entrained with the fiber in the main channel 10. After the mixed material reaches the bell-mouth area formed by the deceleration plate 30, the deceleration plate 30 increases the size of the main discharge port 12. According to the Bernoulli equation, the airflow is decelerated, and the light-weight fiber immediately follows the deceleration. However, the particles with higher density decrease in speed more slowly than the airflow and fibers due to inertia, thereby separating the entrained fibers and granular materials, and finally forming uniformly distributed loose fibers and uniformly distributed granular materials in the bell-mouth area formed by the deceleration plate 30. This avoids the problems of fiber agglomeration and uneven particles that often occur in the industry.

[0010] Figure 1 is the device cross section, Figure 1 The mid-transverse direction is defined as the width direction, Figure 2 The middle transverse direction is the length direction.

[0011] It also includes an airflow channel 50, which forms an acute angle with one side of the upper end of the main channel 10. An air inlet 51 for airflow is formed at one end of the airflow channel 50, and an air outlet 52 is formed at the other end and communicated with the main channel 10 for introducing airflow into the main channel 10. The air outlet 52 is located above the auxiliary discharge port 22. The airflow channel 50 serves as a process cold air channel, and the air inlet 51 is used to be connected in series with the fan and the air conditioner evaporator. The acute angle formed by the process wind direction and the vertical channel generates negative pressure at the fiber inlet 11, inducing the lightweight fibers at the fiber inlet 11 to move downward rapidly, thereby causing greater disturbance to the fibers and granular materials in the large diameter area below the main channel 10, and more obvious pressure reduction when entering the speed reduction plate 30 area, so that the fibers and granular materials are distributed more evenly.

[0012] The airflow channel 50 is at an angle of thirty degrees to one side of the upper end of the main channel 10. Specifically, the airflow channel 50 includes a first access section and a first connecting section that are connected to each other, the air inlet 51 is located on a side of the first access section away from the first connecting section, the first access section is arranged in a horizontal direction, so as to facilitate the connection of the series fan and the air conditioner evaporator, the air outlet 52 is located on a side of the first connecting section away from the first access section, the first connecting section is at an angle of thirty degrees to one side of the upper end of the main channel 10, and is used to guide the airflow to enter the main channel 10 obliquely downward.

[0013] The secondary channel 20 forms an acute angle with one side of the upper end of the primary channel 10 .

[0014] Preferably, the secondary channel 20 is at an angle of thirty degrees to one side of the upper end of the main channel 10. Specifically, the secondary channel 20 includes a second access section and a second connection end, the feed port 21 is located on the side of the second access section away from the second connection section, the second access section is arranged in a horizontal direction, so as to facilitate the connection of the short fiber generating device, the secondary discharge port 22 is located on the side of the second connection section away from the second access section, the second connection section is arranged at an acute angle to one side of the upper end of the main channel 10, the acute angle range is 10-45°, and the optimal is 30°.

[0015] The width of the main channel 10 below the secondary discharge port 22 is less than twice the width of the main channel 10 above the secondary discharge port 22. The width of the main channel 10 above the secondary discharge port 22 is a, and the width of the main channel 10 below the secondary discharge port 22 is b. The width b satisfies 2a≥b≥a. Too large or too small a width of the main channel 10 below the secondary discharge port 22 affects mixing, so the optimal value is b=1.5a. The distance between the secondary discharge port 22 and the air outlet 52 is greater than or equal to three times the width of the main channel 10 above the secondary discharge port 22, that is, the distance between the secondary discharge port 22 and the air outlet 52 is c, satisfying c≥3a. This setting allows the fiber to have enough time and distance between the secondary discharge port 22 and the air outlet 52 to be accelerated to the same speed as the wind speed. The larger the width above the secondary discharge port 22, the more material is fed, and the distance between the secondary discharge port 22 and the air outlet 52 should also be larger accordingly.

[0016] The main channel 10 can be disconnected between the auxiliary discharge port 22 and the air outlet 52, and between the auxiliary discharge port 22 and the speed reduction plate 30, and fixedly connected by a flange. The disconnection of the main channel 10 can turn it into two three-way components, thereby facilitating processing and assembly.

[0017] The base 60 is also included, and the base 60 is distributed on both sides of the speed reduction plate 30 and connected to the main channel 10 for supporting the main channel 10. The lower end of the base 60 is used to be fixed on the web forming machine, and the space between the bases 60 is used for the speed reduction plate 30 to rotate. The base 60 is also used to shield the two sides of the speed reduction plate 30.

[0018] The base 60 is provided with a cross bar 61 on the outside of the deceleration plate 30, and the controller 40 is a telescopic member, one end of the telescopic member is rotatably set on the cross bar 61, and the other end is movably connected to the deceleration plate 30. The main channel 10, the secondary channel 20 and the airflow channel 50 are all extended in the length direction to form a narrow and long channel, and the deceleration plate 30 is correspondingly arranged along the direction in which the main discharge port 12 extends. The outsides of the deceleration plates 30 on both sides are respectively connected with a number of telescopic rods, and one end of the telescopic member is rotatably set on the cross bar 61 and will not move. The telescopic member and the deceleration plate 30 are connected by two rings, so as to facilitate the movement. The telescopic member can control the opening and closing degree of the deceleration plate 30 by telescoping. The telescopic member is a part such as an electromagnet or an electric pull rod. The controller 40 can also be controlled in other ways, such as a motor with a cam to realize the opening and closing of the deceleration plate 30. The side of the two deceleration plates facing each other is the inner side, and the side facing away is the outer side.

[0019] The angle between the deceleration plate 30 and the vertical direction is between 10 and 30 degrees. There are two ways to use the deceleration plate 30, one is a fixed angle, and the other is a variable angle. The fixed angle means that the controller 40 controls the deceleration plate 30 to maintain a certain angle unchanged, thereby achieving a stable splitting effect. The controller 40 can also control the deceleration plate 30 to repeat the opening and closing action within a specified angle range, so that when the angle of the deceleration plate 30 becomes larger, the mixed material can be better dispersed and split, achieving a more uniform mixing effect.

[0020] The velocity of the airflow in the airflow channel 50 is v, the height of the deceleration plate 30 is l, and the controller 40 controls the deceleration plate 30 to complete one opening and closing within the angle range within the time t, and the time t satisfies the following relationship: Among them, a is the width of the main channel 10 above the auxiliary discharge port 22, b is the width of the main channel 10 below the auxiliary discharge port 22, α is the angle between the speed reduction plate 30 and the vertical direction and is selected to be 30°, and l is the height of the speed reduction plate 30.

[0021] The speed of the airflow channel 50 acting on the fiber is greater than the speed of its own descent, so the speed of the fiber after being driven by the airflow is not greater than the airflow speed. After the airflow enters the area below the secondary feed port 21 of the main channel 10, the width of the main channel 10 increases, so the speed of the airflow is , where a is the width of the main channel 10 above the secondary discharge port 22, b is the width of the main channel 10 below the secondary discharge port 22, and the speed of mixing the fiber and the granular material is not greater than , the vertical height of the deceleration plate 30 is , where l is the height of the deceleration plate 30, α is the angle between the deceleration plate 30 and the vertical direction. In order to calculate the shortest time, the angle alpha is selected as 30°. The fastest time t for the airflow to pass through the deceleration plate 30 area without changing the speed is Because the openings between the deceleration plates 30 become larger, the time for the airflow or the mixed material to pass through the deceleration plates 30 is less than time t. Therefore, the deceleration plates 30 can complete one opening and closing within time t, and all the mixed materials passing through the area of ​​the deceleration plates 30 can be broken up and split, thereby achieving a more uniform mixing effect of the mixed materials.

[0022] like Figure 3 and Figure 4 As shown, a plurality of protrusions 31 are provided on the opposite side of the two deceleration plates 30. When the airflow entrains fibers and particulate materials and flows out from the main outlet 12 of the main channel 10 and passes through the area between the deceleration plates 30, a wall flow is formed near the wall of the deceleration plate 30 due to the viscosity of the airflow. The wall flow will develop and strengthen, and it is easy to randomly peel off as the wall of the deceleration plate 30 moves downward, resulting in random disturbances, thereby affecting the uniformity of the product below. In order to eliminate the influence of the wall flow, the present patent is provided with a plurality of arc-shaped protrusions 31 on the deceleration plate 30, or they can be provided only in the upper half. Through the interference effect of the protrusions 31 on the wall flow, the wall flow is disturbed and destroyed in the initial development stage, and peeled off in advance to avoid greater disturbances after its development and strengthening, thereby ensuring the uniformity of the final product. The protrusions 31 can be of any shape, preferably semicircular protrusions 31. The protrusions 31 are arranged in an array in the horizontal direction and in an alternating array in the vertical direction, so that the three closest nonlinear protrusions 31 are arranged in an equilateral triangle. The semicircle diameter of the protrusion 31 is 5 mm, the height of the protrusion 31 is 1-2 mm, and the relationship between the center spacing e of the protrusions 31 in the horizontal direction and the diameter d of the convex bottom circle is 2d≤e≤3d.

[0023] A plurality of ventilation holes 32 are provided at the upper end of the deceleration plate 30. After the mixed material formed by the fiber and the granular material is ejected from the main discharge port 12, in order to rapidly reduce the pressure in the area of ​​the deceleration plate 30, ventilation holes 32 are provided at the upper end of the depressurization plate, so that the outside air can enter the area between the depressurization plates from the ventilation holes 32, thereby achieving a better depressurization effect, and making the mixed material dispersed more evenly.

[0024] A sliding rod 33 extending axially is provided in the ventilation hole 32, and a fixed edge 34 extends from the inner end of the sliding rod 33 to the inner wall of the ventilation hole 32, and a circular sealing disc 35 is provided at the outer end of the sliding rod 33; an annular sealing ring piece 36 is provided at the outer end of the ventilation hole 32, so that the diameter of the outer end of the ventilation hole 32 is smaller than the diameter of the inner end; a sliding piece 37 is sleeved on the sliding rod 33, and the sliding piece 37 is concentric and used to slide along the sliding rod 33. The diameter of the central circular hole of the sliding piece 37 is smaller than the diameter of the sealing disc 35, and the diameter of the outer ring of the sliding piece 37 is larger than the diameter of the inner hole of the sealing ring piece 36, and smaller than the diameter of the ventilation hole 32; when the sliding piece 37 moves to the inner end of the sliding rod 33, the ventilation hole 32 can pass airflow, and when the sliding piece 37 moves to the outer end of the sliding rod 33, the ventilation hole 32 is blocked by the sliding piece 37. Due to the arrangement of the sealing disc 35 and the sealing ring 36, concentric holes are formed on the outside of the ventilation hole 32, and can be completely covered by the sliding piece 37. When the speed brake adopts a fixed angle, the sliding piece 37 is always on the inner side of the sliding rod 33 due to air pressure, and the ventilation hole 32 is always in an open state and will not change. When the speed brake adopts a variable angle, when the speed brake is opened outward, the external airflow will enter the area between the pressure reducing plates through the ventilation hole 32. At this time, the sliding piece 37 is blown to the inner end of the sliding rod 33 by the airflow, and the ventilation hole 32 is in an open state. When the speed brake is closed inward, the sliding piece 37 will slide to the outer end of the sliding rod 33 due to inertia. At this time, the ventilation hole 32 is in a closed state, thereby preventing the mixed material from going out of the ventilation hole 32.

[0025] The above are only preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A fiber mixing and uniform distribution device, characterized in that: It comprises a main channel (10), a secondary channel (20), a speed reduction plate (30) and a controller (40); The upper end of the main channel (10) is formed with a fiber inlet (11) for feeding fibers, and the lower end is formed with a main discharge port (12); A feed port (21) for feeding granular material is formed at one end of the secondary channel (20), and a secondary discharge port (22) is formed at the other end and is connected to the main channel (10) for feeding granular material into the main channel (10); The width of the main channel (10) below the secondary discharge port (22) is greater than the width of the main channel (10) above the secondary discharge port (22); There are two deceleration plates (30), which are rotatably connected to the two sides of the main discharge port (12) respectively, and are used to increase the opening size of the main discharge port (12); The controller (40) is connected to the deceleration plates (30) and is used to control the rotation of the two deceleration plates (30), thereby changing the size of the opening between the two deceleration plates (30).

2. A fiber mixing and uniform distribution device according to claim 1, characterized in that: The invention also comprises an air flow channel (50), wherein the air flow channel (50) forms an acute angle with one side of the upper end of the main channel (10), an air inlet (51) for air flow is formed at one end of the air flow channel (50), and an air outlet (52) is formed at the other end and is connected to the main channel (10) for introducing air flow into the main channel (10), and the air outlet (52) is located above the auxiliary discharge port (22).

3. A fiber mixing and uniform distribution device according to claim 1, characterized in that: The secondary channel (20) forms an acute angle with one side of the upper end of the main channel (10).

4. A fiber mixing and uniform distribution device according to claim 1, characterized in that: The distance between the secondary material outlet (22) and the air outlet (52) is greater than or equal to three times the width of the main channel (10) located above the secondary material outlet (22).

5. The fiber mixing and uniform distribution device according to claim 1, characterized in that: The width of the main channel (10) below the secondary discharge port (22) is less than twice the width of the main channel (10) above the secondary discharge port (22).

6. A fiber mixing and uniform distribution device according to any one of claims 1 to 5, characterized in that: It also includes a base (60), which is distributed on both sides of the speed reduction plate (30) and connected to the main channel (10) to support the main channel (10); The base (60) is provided with a cross bar (61) on the outer side of the speed reduction plate (30); the controller (40) is a telescopic member, one end of which is rotatably arranged on the cross bar (61) and the other end of which is movably connected to the speed reduction plate (30).

7. A fiber mixing and uniform distribution device according to any one of claims 1 to 5, characterized in that: The velocity of the airflow in the airflow channel (50) is v, the height of the deceleration plate (30) is l, and the controller (40) controls the deceleration plate (30) to complete one opening and closing within the angle range within a time t, and the time t satisfies the following relationship: Wherein, a is the width of the main channel (10) above the secondary discharge port (22), b is the width of the main channel (10) below the secondary discharge port (22), α is the angle between the speed reduction plate (30) and the vertical direction and is selected to be 30°, and l is the height of the speed reduction plate (30).

8. A fiber mixing and uniform distribution device according to any one of claims 1 to 5, characterized in that: A plurality of protrusions (31) are arranged on opposite sides of the two speed reduction plates (30).

9. A fiber mixing and uniform distribution device according to any one of claims 1 to 5, characterized in that: A plurality of ventilation holes (32) are provided at the upper end of the speed reduction plate (30).

10. A fiber mixing and uniform distribution device according to claim 9, characterized in that: A sliding rod (33) extending in the axial direction is arranged in the ventilation hole (32); a fixed edge (34) is extended from an inner end of the sliding rod (33) toward the inner wall of the ventilation hole (32); and a circular sealing disc (35) is arranged at an outer end of the sliding rod (33); An annular sealing ring sheet (36) is provided at an outer end of the ventilation hole (32), so that the diameter of the outer end of the ventilation hole (32) is smaller than the diameter of the inner end; The sliding rod (33) is sleeved with a sliding sheet (37), the sliding sheet (37) is in a concentric circle shape and is used to slide along the sliding rod (33), the diameter of the central circular hole of the sliding sheet (37) is smaller than the diameter of the sealing disc (35), the diameter of the outer ring of the sliding sheet (37) is larger than the diameter of the inner hole of the sealing ring sheet (36) and smaller than the diameter of the ventilation hole (32); When the sliding plate (37) moves to the inner end of the sliding rod (33), air can pass through the ventilation hole (32); when the sliding plate (37) moves to the outer end of the sliding rod (33), the ventilation hole (32) is blocked by the sliding plate (37).

Images