A mixing device for producing coated paper

Abstract

The invention relates to the technical field of coated paper production, and in particular to a mixing device for manufacturing coated paper, comprising a vertical pulping cylinder, a rotating shaft, a pulp collecting cylinder and an elastic ring, wherein the rotating shaft is coaxially inserted at the bottom of the pulping cylinder and can rotate on its own, and a rotor is fixedly sleeved on the top of the rotating shaft, and the rotor has a plurality of blades uniformly arranged along the circumferential direction; the pulp collecting cylinder is sleeved on the rotating shaft, and a plurality of sieve holes are arranged on the top of the pulp collecting cylinder, and the sieve holes connect the pulping cylinder and the pulp collecting cylinder; the elastic ring is fixedly inserted between the pulp collecting cylinder and the pulping cylinder, and a plurality of blocking rod groups arranged in the radial direction are arranged on the upper surface of the elastic ring; a sealed chamber is formed between the elastic ring, the pulp collecting cylinder, the rotating shaft and a third cylinder body, and the sealed chamber is filled with gas; thereby, on the one hand, hard objects can be prevented from floating up and colliding with the rotor under the blocking of the blocking rod, and on the other hand, the pressure on both sides of the elastic ring is equal, which is beneficial to improving the sealing between the elastic ring and the third cylinder body and the pulp collecting cylinder, and reducing leakage.

Description

Technical Field

[0001] The invention relates to the technical field of laminated paper production, in particular to a mixing device for manufacturing laminated paper. Background Art

[0002] Laminated paper is a special paper with a layer of plastic film (usually polyethylene) coated on the surface. It has the advantages of being waterproof, moisture-proof, and oil-proof. It is widely used in food packaging, printing, and electronic product packaging.

[0003] The production process of coated paper includes base paper preparation, material preparation, spraying, drying and winding. In the base paper preparation stage, in order to ensure the quality of paper products, pulping equipment is needed to pulp pulp boards, waste books and waste cartons.

[0004] A hydraulic pulper is a common pulping equipment. In the related art, for example, Chinese patent CN111041878B discloses a vertical hydraulic pulper. A turntable is provided at the central part of the bottom of the basin of the vertical hydraulic pulper, on which a plurality of impeller blades are mounted. A fixed disk with a plurality of blades is provided around the bottom of the disk. The turntable is driven by an electric motor located below through a rotating shaft, or is connected to a transmission motor by a flexible coupling, a reduction gearbox and a rigid coupling. The turntable mainly relies on the mechanical action of the turntable and also relies on the friction of the fiber material to decompose the fibers.

[0005] Although the existing hydraulic pulper can improve the pulping effect during the pulping process, it is found in actual use that, on the one hand, the rotor is easily damaged by the jamming of hard objects, and on the other hand, the gravity of the pulp will cause a certain pressure on the lower shaft seal, which is prone to water leakage and pulp leakage, resulting in frequent shutdown for maintenance, affecting the preparation efficiency of base paper and coated paper. Summary of the invention

[0006] Based on this, it is necessary to provide a mixing device for manufacturing coated paper to address the problem of low preparation efficiency in the current coating paper preparation process.

[0007] The above purpose is achieved through the following technical solutions:

[0008] A mixing device for producing coated paper, comprising:

[0009] A vertical pulping cylinder, the pulping cylinder having a first cylinder body, a second cylinder body and a third cylinder body arranged in sequence from top to bottom, wherein the diameter of the first cylinder body is larger than the diameter of the third cylinder body, and the second cylinder body is an inverted cone structure, so as to facilitate the introduction of hard objects into the third cylinder body;

[0010] A rotating shaft is coaxially inserted at the bottom of the third cylinder and is capable of self-rotation, a rotor is fixedly sleeved on the top of the rotating shaft, and the rotor has a plurality of blades evenly arranged along the circumferential direction;

[0011] A pulp collecting cylinder is sleeved on the rotating shaft and can rotate relative to the rotating shaft. A plurality of sieve holes are arranged on the top of the pulp collecting cylinder. The sieve holes communicate with the pulp crushing cylinder and the pulp collecting cylinder and are used to receive the crushed pulp.

[0012] An elastic ring is fixedly inserted between the third cylinder and the pulp collecting cylinder, and a plurality of blocking rod groups arranged in the radial direction are provided on the upper surface of the elastic ring, each of the blocking rod groups includes a plurality of blocking rods evenly arranged in the circumferential direction, and the blocking rods are used to prevent the hard object from being driven by the pulp;

[0013] A sealed chamber is formed between the elastic ring, the pulp collecting cylinder, the rotating shaft and the third cylinder, and the sealed chamber is filled with gas with a preset pressure.

[0014] Furthermore, the rotor is provided with a plurality of flying knives evenly arranged along the circumferential direction; the top of the pulp collecting cylinder is provided with a plurality of bottom knives evenly arranged along the circumferential direction, and the bottom knives and the flying knives together form a shearing structure.

[0015] Furthermore, the blocking rod is an awn structure.

[0016] Furthermore, the mixing equipment for producing coated paper also includes a sealing structure, and the sealing structure is arranged between the pulp collecting cylinder and the rotating shaft.

[0017] Furthermore, the sealing structure includes at least one sealing ring.

[0018] Furthermore, the mixing equipment for producing coated paper also includes an air supply mechanism, and the air supply mechanism is used to supply gas to the sealed chamber.

[0019] Furthermore, the air replenishing mechanism includes an air pressure sensor and an air pump, the air pressure sensor is arranged in the sealed chamber and is configured to sense the air pressure in the sealed chamber; the air suction end of the air pump is connected to the external environment, and the air exhaust end is connected to the sealed chamber.

[0020] Furthermore, the mixing device for producing coated paper also includes a driving mechanism, and the driving mechanism is configured to provide a driving force for the rotation of the rotating shaft.

[0021] Furthermore, the driving mechanism includes a driving motor, a coupling and a reduction box, the motor shaft of the driving motor is connected to the input end of the reduction box through the coupling, and the output end of the reduction box is connected to the rotating shaft.

[0022] Furthermore, a plurality of pulp fragments evenly arranged along the circumferential direction are arranged on the inner circumferential wall of the second cylinder.

[0023] The beneficial effects of the present invention are:

[0024] When the mixing device for producing coated paper provided by the present invention is used, water and waste paper materials are firstly continuously put into the pulping cylinder, and then the rotating shaft is driven to rotate, and the rotating shaft synchronously drives the blades to rotate through the rotor. On the one hand, the blades drive the water and waste paper materials to form a spiral high-intensity turbulence, while strengthening the crushing effect of the waste paper materials, the water and waste paper materials are mixed evenly by stirring, and finally form slurry, which then enters the pulp collecting cylinder through the sieve holes, and on the other hand, drives the hard objects to first move to the inner circumferential wall of the pulping cylinder, and then moves along the inner circumferential wall of the second cylinder body to the elastic ring under the action of gravity, and is located between the blocking rods, so that it can be blocked by the blocking rods to avoid The slurry floats and collides with the rotor; at the same time, the setting of the sealing chamber isolates the direct contact between the slurry and the rotating shaft, reducing the possibility of slurry leakage from the rotating shaft seal; in the pulping process, when the pressure on the elastic ring caused by the gravity of the slurry increases, the elastic ring will be concave under the pull of the third cylinder and the slurry collecting cylinder. On the one hand, the blocking rods on it are brought closer to each other, thereby further hindering the floating of hard objects and avoiding damage to the rotor. On the other hand, the volume of the sealing chamber is reduced and the pressure is increased, so that the pressure of the sealing chamber on the elastic ring is equal to the pressure on the elastic ring caused by the gravity of the slurry, which is beneficial to improve the sealing between the elastic ring and the third cylinder, the slurry collecting cylinder, and the rotating shaft and the slurry collecting cylinder, and reduce leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the three-dimensional structure of a mixing device for producing coated paper provided in one embodiment of the present invention;

[0026] Figure 2 A schematic cross-sectional perspective structural diagram of a mixing device for producing coated paper provided in one embodiment of the present invention;

[0027] Figure 3 A schematic side view of a mixing device for producing coated paper according to an embodiment of the present invention;

[0028] Figure 4 for Figure 3 Middle AA section view Figure 1 ;

[0029] Figure 5 for Figure 4 A schematic diagram of the partially enlarged structure at B in the middle;

[0030] Figure 6 for Figure 3 Middle AA section view Figure 2 ;

[0031] Figure 7 for Figure 6 Schematic diagram of the partial enlarged structure at point C in the middle.

[0032] in:

[0033] 1. pulping cylinder; 101. feed port; 11. first cylinder; 12. second cylinder; 13. third cylinder; 14. pulping blade; 15. rotating shaft; 16. rotor; 161. blade;

[0034] 2. pulp collecting cylinder; 201. sieve hole; 21. sealing ring;

[0035] 3. elastic ring; 31. blocking rod;

[0036] 4. Driving mechanism; 41. Driving motor; 42. Coupling; 43. Reducer. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned herein, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0039] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] like Figures 1 to 7As shown, a mixing device for manufacturing coated paper provided by an embodiment of the present invention is used for crushing pulp, and is configured to include a vertical pulping cylinder 1, a rotating shaft 15, a pulp collecting cylinder 2 and an elastic ring 3, wherein the pulping cylinder 1 has a first cylinder 11, a second cylinder 12 and a third cylinder 13 arranged in sequence from top to bottom, wherein the diameter of the first cylinder 11 is greater than the diameter of the third cylinder 13, and the second cylinder 12 is an inverted cone structure, so as to facilitate the introduction of hard objects into the third cylinder 13; the rotating shaft 15 is coaxially inserted at the bottom of the third cylinder 13 and can rotate by itself, and a rotor 16 is fixedly sleeved on the top of the rotating shaft 15, and the rotor 16 has a plurality of blades 161 evenly arranged along the circumferential direction; The pulp collecting cylinder 2 is sleeved on the rotating shaft 15 and can rotate relative to the rotating shaft 15. A plurality of sieve holes 201 are arranged on the top of the pulp collecting cylinder 2. The sieve holes 201 connect the pulp crushing cylinder 1 and the pulp collecting cylinder 2 and are used to receive the crushed pulp; the elastic ring 3 is fixedly inserted between the third cylinder 13 and the pulp collecting cylinder 2, and a plurality of radially arranged blocking rods 31 groups are arranged on the upper surface of the elastic ring 3. Each blocking rod 31 group includes a plurality of blocking rods 31 evenly arranged along the circumferential direction, and the blocking rods 31 are used to prevent hard objects from being driven by the slurry; a sealed chamber is formed between the elastic ring 3, the pulp collecting cylinder 2, the rotating shaft 15 and the third cylinder 13, and the sealed chamber is filled with gas with a preset pressure.

[0041] Specifically in this embodiment, Figure 2 As shown, the large end of the second cylinder 12 is coaxially and fixedly connected to the bottom of the first cylinder 11, and the small end of the second cylinder 12 is coaxially and fixedly connected to the top of the third cylinder 13. The setting of the conical structure enables the hard object to move from top to bottom along the inner circumferential wall of the second cylinder 12 to the elastic ring 3 and be located between the blocking rods 31, so that it can be blocked by the blocking rods 31 to avoid floating and colliding with the rotor 16; the top end of the rotating shaft 15 is suspended and inserted inside the pulping cylinder 1 and is located at the second cylinder 12, and the bottom end of the rotating shaft 15 passes through the bottom of the third cylinder 13 and is suspended outside the third cylinder 13; as shown Figure 4 As shown, a feed port 101 is provided on the circumferential side wall of the first cylinder 11 near the top, and the feed port 101 is used to receive water and waste paper materials; Figure 5 As shown, the rotor 16 is configured as a cap-like structure, and is configured to be coaxially and fixedly connected to the top of the rotating shaft 15 by bolts during installation, and the blades 161 are configured as a curved surface structure, and the number can be set to eight. Driven by the blades 161, the slurry can form a tornado-like flow; Figure 5As shown, in order to facilitate fixed insertion between the third cylinder 13 and the pulp collecting cylinder 2, an annular first protrusion is arranged on the outer circumferential wall of the elastic ring 3, and an annular second protrusion is arranged on the inner circumferential wall of the elastic ring 3, and the first protrusion and the second protrusion are both arranged as T-shaped structures. Correspondingly, an annular first groove capable of being engaged with the first protrusion is arranged on the inner circumferential wall of the third cylinder 13, and an annular second groove capable of being engaged with the second protrusion is arranged on the outer circumferential wall of the pulp collecting cylinder 2, and the first groove and the second groove are both arranged as T-shaped structures, and the number of the blocking rod 31 groups can be set to three.

[0042] More specifically, the elastic ring 3 may be made of rubber.

[0043] During use, water and waste paper materials are first continuously fed into the pulping cylinder 1 through the feed port 101, and then the rotating shaft 15 is driven to rotate. The rotating shaft 15 synchronously drives the blades 161 to rotate through the rotor 16. On the one hand, the blades 161 drive the water and waste paper materials to form a spiral high-intensity turbulence, while strengthening the waste paper material crushing effect, the water and waste paper materials are mixed evenly by stirring, and finally form slurry, which then enters the pulp collecting cylinder 2 through the sieve hole 201. On the other hand, it drives the hard objects to first move to the inner circumferential wall of the pulping cylinder 1, and then moves along the inner circumferential wall of the second cylinder body 12 to the elastic ring 3 under the action of gravity, and is located between the blocking rods 31, so that it can be blocked by the blocking rods 31 to avoid floating and colliding with the rotor 16; at the same time, the setting of the sealing chamber isolates the direct contact between the slurry and the rotating shaft 15, reducing the possibility of slurry leakage from the sealing part of the rotating shaft 15; Figure 7 As shown, during the pulping process, when the pressure on the elastic ring 3 caused by gravity of the slurry increases, the elastic ring 3 will be concave under the pulling of the third cylinder 13 and the pulp collecting cylinder 2. On the one hand, the blocking rods 31 thereon are brought closer to each other, thereby further hindering the floating of hard objects and avoiding damage to the rotor 16. At the same time, it helps to enhance the sealing between the elastic ring 3 and the third cylinder 13 and the pulp collecting cylinder 2, which is conducive to further reducing leakage. On the other hand, it reduces the volume and increases the pressure of the sealed chamber, which helps to enhance the sealing between the rotating shaft 15 and the pulp collecting cylinder 2, which is conducive to further reducing leakage. When the pressure on the elastic ring 3 caused by gravity of the slurry decreases, the elastic ring 3 can automatically rebound upward under the elastic effect of the elastic ring 3 itself and the air pressure in the sealed chamber, thereby avoiding maintaining a large concave angle for a long time and reducing the impact on the service life.

[0044] In some embodiments, in order to further improve the crushing effect of waste paper materials, the rotor 16 is also provided with a plurality of flying knives evenly arranged along the circumference; the top of the pulp collecting cylinder 2 is provided with a plurality of bottom knives evenly arranged along the circumference, and the bottom knives and the flying knives together constitute a shearing structure.

[0045] Specifically in this embodiment, the number of flying knives can be set to eight, and they are arranged one-to-one corresponding to the blades 161 and are located below the blades 161; the number of bottom knives can be set to eight.

[0046] During use, the relative movement between the flying knife and the bottom knife can produce the effect of scissors shearing, thereby facilitating the shredding of waste paper materials.

[0047] In some other embodiments, the blocking rod 31 is configured as an awn structure.

[0048] Specifically in this embodiment, Figure 5 As shown, the wheat awn structure is configured to include a main body part and multiple wheat ear parts, wherein the main body part is configured to be a truncated cone structure, and when installed, the small end is configured to be upwardly arranged, and the large end is vertically arranged on the upper surface of the elastic ring 3; the multiple wheat ear parts are axially evenly arranged on the circumferential side wall of the main body part, and each wheat ear part includes multiple wheat ears evenly arranged along the circumferential direction, and the wheat ears are configured to be a round rod structure, and one end is fixed on the circumferential side wall of the main body part, and the other end is suspended, and the whole is inclined downward.

[0049] During the crushing process, the presence of wheat ears can prevent hard objects from floating up; when the pressure on the elastic ring 3 generated by gravity of the slurry increases, the elastic ring 3 will be concave under the pull of the third cylinder 13 and the slurry collecting cylinder 2, so that the wheat ears on adjacent blocking rods 31 are arranged crosswise, thereby further preventing hard objects from floating up.

[0050] In other embodiments, the mixing equipment for manufacturing coated paper is configured to also include a sealing structure, which is disposed between the pulp collecting cylinder 2 and the rotating shaft 15 so as to cooperate with the high pressure in the sealing chamber to perform sealing, thereby further improving the sealing between the pulp collecting cylinder 2 and the rotating shaft 15 and reducing the possibility of pulp leakage from between the pulp collecting cylinder 2 and the rotating shaft 15.

[0051] In a further embodiment, the sealing structure may be configured to include at least one sealing ring 21 .

[0052] Specifically in this embodiment, Figure 5 As shown, there may be three sealing rings 21 , which are inserted between the rotating shaft 15 and the pulp collecting cylinder 2 at equal intervals along the axial direction.

[0053] More specifically, the sealing ring 21 may be made of rubber.

[0054] In other embodiments, the sealing structure may also be configured to include a labyrinth-like annular protrusion and a labyrinth-like annular groove capable of cooperating with the labyrinth-like annular protrusion, wherein the labyrinth-like annular protrusion may be disposed on the circumferential side wall of the rotating shaft 15, and the labyrinth-like annular groove may be disposed on the inner circumferential wall of the pulp collecting cylinder 2, or the labyrinth-like annular protrusion may also be disposed on the inner circumferential wall of the pulp collecting cylinder 2, and the labyrinth-like annular groove may also be disposed on the circumferential side wall of the rotating shaft 15.

[0055] In other embodiments, in order to avoid insufficient air pressure in the sealed chamber, the mixing device for manufacturing coated paper is configured to also include an air replenishing mechanism, which is used to replenish gas into the sealed chamber.

[0056] In a further embodiment, the air replenishing mechanism is configured to include an air pressure sensor and an air pump. The air pressure sensor is arranged in the sealed chamber and is configured to sense the air pressure in the sealed chamber; the air suction end of the air pump is connected to the external environment, and the exhaust end is connected to the sealed chamber.

[0057] Specifically in this embodiment, the air pressure sensor is configured to send a start signal to the air pump when the air pressure inside the sealed chamber is lower than a first preset air pressure, and to send a stop signal to the air pump when the air pressure inside the sealed chamber is higher than a second preset air pressure, wherein the second preset air pressure is greater than the first preset air pressure.

[0058] In other embodiments, the mixing device for producing coated paper is configured to further include a driving mechanism 4 , and the driving mechanism 4 is configured to provide a driving force for the rotation of the rotating shaft 15 .

[0059] In a further embodiment, Figure 1 As shown, the driving mechanism 4 can be configured to include a driving motor 41 , a coupling 42 and a reduction box 43 , wherein the motor shaft of the driving motor 41 is connected to the input end of the reduction box 43 through the coupling 42 , and the output end of the reduction box 43 is connected to the rotating shaft 15 .

[0060] During use, the drive motor 41 is started, and the drive motor 41 drives the rotating shaft 15 to rotate through the transmission of the coupling 42 and the reduction box 43.

[0061] In other embodiments, in order to further enhance the pulping effect and promote pulp circulation, a plurality of pulping pieces 14 are provided on the inner circumferential wall of the second cylinder 12, and the plurality of pulping pieces 14 are evenly arranged along the circumferential direction.

[0062] Specifically in this embodiment, Figure 2 As shown, there may be eight pulping blades 14, and all of them are inclined in the same direction.

[0063] During use, the existence of the pulping blades 14 can, on the one hand, generate shear force on the pulp to increase friction and collision with the pulp, thereby improving pulping efficiency; on the other hand, it can change the flow pattern of the pulp in the pulping tube 1 to promote circulation and mixing of the pulp.

[0064] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A mixing device for producing coated paper, characterized in that: include: A vertical pulping cylinder, the pulping cylinder having a first cylinder body, a second cylinder body and a third cylinder body arranged in sequence from top to bottom, wherein the diameter of the first cylinder body is larger than the diameter of the third cylinder body, and the second cylinder body is an inverted cone structure, so as to facilitate the introduction of hard objects into the third cylinder body; A rotating shaft is coaxially inserted at the bottom of the third cylinder and is capable of self-rotation, a rotor is fixedly sleeved on the top of the rotating shaft, and the rotor has a plurality of blades evenly arranged along the circumferential direction; A pulp collecting cylinder is sleeved on the rotating shaft and can rotate relative to the rotating shaft and is located below the rotor. A plurality of sieve holes are arranged on the top of the pulp collecting cylinder. The sieve holes communicate with the pulp crushing cylinder and the pulp collecting cylinder and are used to receive the crushed pulp. An elastic ring is fixedly inserted between the third cylinder and the pulp collecting cylinder, and a plurality of blocking rod groups arranged in a radial direction are arranged on the upper surface of the elastic ring, each of the blocking rod groups includes a plurality of blocking rods evenly arranged in a circumferential direction, and the blocking rods are used to block the hard object from being driven by the slurry; an annular first protrusion is arranged on the outer peripheral wall of the elastic ring, and an annular second protrusion is arranged on the inner peripheral wall of the elastic ring, and the first protrusion and the second protrusion are both arranged in a T-shaped structure, an annular first groove capable of being clamped with the first protrusion is arranged on the inner peripheral wall of the third cylinder, and an annular second groove capable of being clamped with the second protrusion is arranged on the outer peripheral wall of the pulp collecting cylinder, and the first groove and the second groove are both arranged in a T-shaped structure; A sealed chamber is formed between the elastic ring, the pulp collecting cylinder, the rotating shaft and the third cylinder, and the sealed chamber is filled with gas with a preset pressure.

2. The mixing equipment for producing coated paper according to claim 1, characterized in that: The rotor is also provided with a plurality of flying knives evenly arranged along the circumferential direction; the top of the pulp collecting cylinder is provided with a plurality of bottom knives evenly arranged along the circumferential direction, and the bottom knives and the flying knives together form a shearing structure.

3. The mixing equipment for producing coated paper according to claim 1, characterized in that: The blocking rod is a wheat awn structure.

4. The mixing equipment for producing coated paper according to claim 1, characterized in that: The mixing device for producing coated paper further comprises a sealing structure, and the sealing structure is arranged between the pulp collecting cylinder and the rotating shaft.

5. The mixing equipment for producing coated paper according to claim 4, characterized in that: The sealing structure includes at least one sealing ring.

6. The mixing equipment for producing coated paper according to claim 1, characterized in that: The mixing equipment for producing coated paper further comprises an air supply mechanism, and the air supply mechanism is used to supply gas to the sealed chamber.

7. The mixing equipment for producing coated paper according to claim 6, characterized in that: The air replenishing mechanism includes an air pressure sensor and an air pump. The air pressure sensor is arranged in the sealed chamber and is configured to sense the air pressure in the sealed chamber. The air suction end of the air pump is connected to the external environment, and the air exhaust end is connected to the sealed chamber.

8. The mixing equipment for producing coated paper according to claim 1, characterized in that: The mixing device for producing coated paper further comprises a driving mechanism, and the driving mechanism is configured to provide a driving force for rotating the rotating shaft.

9. The mixing equipment for producing coated paper according to claim 8, characterized in that: The driving mechanism comprises a driving motor, a coupling and a reduction box. The motor shaft of the driving motor is connected to the input end of the reduction box through the coupling, and the output end of the reduction box is connected to the rotating shaft.

10. The mixing equipment for producing coated paper according to claim 1, characterized in that: A plurality of pulp fragments evenly arranged along the circumferential direction are arranged on the inner circumferential wall of the second cylinder.

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