An inclined mesh headbox with an ultrasonic device and its application

Abstract

The present invention relates to an inclined mesh headbox with an ultrasonic device and its application, belonging to the field of papermaking equipment. The inclined mesh headbox with an ultrasonic device includes a multi-tube pulp inlet device 101, an upper lip plate safety device 102, a headbox upper lip plate height adjustment device 103, a headbox lower lip plate height adjustment device 104, a side wall panel 106, a bracket 107, a lifting and lowering device 108, an observation hole 109, and a water sealing device 111. The interior includes a pulp inlet pipe 301, a movable upper cover 302, a fixed upper cover 303, an upper lip plate 304, a lower lip plate 305, a pulp mixing chamber 306, a flow stabilization chamber 307, a bottom plate 308, a first group of tube bundle devices 311, and a second group of tube bundle devices 312. The fixed upper cover 303 is provided with an ultrasonic device array 202. The present invention solves problems such as poor paper uniformity caused by re-flocculation between dispersed fibers in the pulp and adhesion of adhesive in the papermaking pulp to the inner wall of the headbox.

Description

Technical Field

[0001] The invention relates to an inclined wire headbox with an ultrasonic device and application thereof, belonging to the field of papermaking equipment. Background Art

[0002] The emergence of the inclined wire paper machine stems from the application of long fibers and non-plant fibers in papermaking. Because the inclined wire former offers excellent dewatering performance, high papermaking uniformity, excellent air permeability, low wire density, and the ability to produce long fibers, it offers significant advantages over other paper machines, such as the Fourdrinier wire, in the production of certain specialty papers. The inclined wire former is the most critical component of the inclined wire paper machine. Currently, hundreds of inclined wire formers are used worldwide to produce wet-laid specialty papers, the majority of which are in Europe. my country's inclined wire former was imported from Voith in Germany in 2003 to produce high-permeability nozzle-bar-formed paper. Since 2008, domestic paper machine manufacturers have begun manufacturing and improving inclined wire formers to accommodate the production of a wider range of wet-laid specialty papers. The inclined wire headbox, the most core component of the inclined wire former, has been a key focus of inclined wire paper machine researchers' modification, upgrading, and R&D efforts.

[0003] Research into the mechanisms and equipment development of ultrasonic cleaning technology, as well as its application, has been underway in my country for nearly 50 years, progressing almost in parallel with progress abroad. Particularly in the late 1980s and early 1990s, with the rapid development of the national economy, the continuous advancement of science and technology, and the urgent need for advanced manufacturing technologies, research into ultrasonic cleaning technology and the development of ultrasonic cleaning equipment experienced rapid growth. Compared to other cleaning methods, ultrasonic cleaning offers advantages such as high cleaning rates, minimal residue, shorter cleaning times, and superior cleaning effectiveness, and is independent of the surface shape of the workpiece being cleaned. Because the ultrasonic generator utilizes Class D amplification and the transducer has high electroacoustic efficiency, ultrasonic cleaning offers the advantages of high efficiency and energy conservation. Therefore, ultrasonic cleaning is a truly high-speed, high-quality, environmentally friendly, and easily automated cleaning technology. Data indicates that ultrasonic cleaning equipment is highly effective for dispersing synthetic fibers, particularly hydrophobic synthetic fibers. At the appropriate slurry concentration, it takes only 7 minutes to disperse the slurry into a well-defined papermaking suspension, making it the most efficient dispersion method currently available.

[0004] Applying ultrasonic devices to the headbox of inclined wire paper machines can not only improve the uniformity and quality of the paper being produced, but also give the headbox a self-cleaning function, thereby improving production efficiency and even breaking through the bottleneck that makes industrial production of certain specialty papers difficult in China.

[0005] At present, there is no case of applying ultrasonic devices to paper machine headboxes, especially inclined wire paper machine headboxes. Summary of the Invention

[0006] In order to solve the above problems, the present invention provides an inclined wire headbox with an ultrasonic device.

[0007] The external structure of the inclined wire headbox with ultrasonic device includes a multi-tube pulp feeding device 101, an upper lip plate safety device 102, a headbox upper lip plate height adjustment device 103, a headbox lower lip plate height adjustment device 104, a side wall plate 106, a bracket 107, a lifting and lowering device 108, an observation hole 109, a water sealing device 111, and a forming wire 112;

[0008] The side wall panels 106 are panels on the left and right sides of the box body. The side wall panels 106 are provided with observation holes for observing the pulp feeding situation. Water sealing devices 111 are provided below the side wall panels 106. The water sealing devices 111 are labyrinth-type polymer sealing strips for preventing pulp blockage in the side wall panels and tearing of the forming wire. The brackets 107 are used to support the box body. The lifting and lowering devices 108 are connected to the brackets 107 and are used to adjust the opening and closing of the headbox.

[0009] The inclined wire headbox with ultrasonic device includes a movable upper cover 302, a fixed upper cover 303, an upper lip plate 304, a lower lip plate 305, a mixing chamber 306, a flow stabilization chamber 307, a bottom plate 308, a first set of tube bundle devices 311, and a second set of tube bundle devices 312. The first set of tube bundle devices 311 and the second set of tube bundle devices 312 are both composed of multiple pipes for uniformly dispersing papermaking pulp.

[0010] The multi-tube pulp feeding device 101 is composed of multiple pulp feeding pipes 301, which are used to ensure that the pressure and profile of the papermaking pulp are uniform;

[0011] The upper lip plate safety device 102 is located on the upper surface of the upper lip plate 304 and includes a cylinder, a cylinder fixing seat, a rotating shaft, a bolt and a pressure sensor. It is pneumatically controlled. When the pressure sensor detects overpressure inside the box, the cylinder, the cylinder fixing seat, the rotating shaft and the bolts will automatically lift the upper lip plate to protect the safety of the equipment.

[0012] The upper lip height adjustment device 103 is located on the upper surface of the movable upper cover 302 and includes a screw lift and a handwheel. The lower lip height adjustment device 104 includes a screw lift, a drive motor and a handwheel, both of which can be adjusted electrically and manually.

[0013] The mixing chamber 306 is the space between the two sets of tube bundle devices in the headbox; the stabilizing chamber 307 is the space between the second set of tube bundle devices 312 and the forming wire 112 in the headbox;

[0014] The movable upper cover 302 is located at the top of the mixing chamber 306 and is provided with a pneumatic opening and closing device 105. The pneumatic opening and closing device includes a cylinder, a cylinder fixing seat, a rotating shaft and a bolt. The opening and closing of the movable upper cover 302 is controlled by pneumatics. After opening the movable upper cover 302, it is convenient to inspect and clean the interior of the box;

[0015] The fixed upper cover 303 is connected to the upper lip plate 304 and is located on the top of the flow stabilization chamber 307;

[0016] The fixed upper cover 303 is provided with an ultrasonic device array 202, which is composed of a plurality of ultrasonic vibration mechanisms, such as ultrasonic vibration plates or ultrasonic vibrators. The ultrasonic device array can be fully or partially opened according to actual production needs;

[0017] A pulp distributor 203 is further provided on the outside of the inclined wire headbox with ultrasonic device, and the pulp distributor 203 is connected to the pulp inlet pipe 301 .

[0018] In one embodiment of the invention, all of the screw lifts are made of SUS304 stainless steel.

[0019] In one embodiment of the invention, the side wall panel 106 is made of SUS304 stainless steel plate with a thickness of 6-20 mm and welded, and the contact surface with the papermaking slurry is ground and polished, with a surface roughness equal to or less than 0.6, and the material of the observation hole is transparent organic glass.

[0020] In one embodiment of the invention, the pipes of the first group of tube bundle devices 311 are round pipes, and the pipes of the second group of tube bundle devices 312 are square pipes; the average straight-line distance between the second group of tube bundle devices 312 and the forming mesh 112 is 200-600 mm; the diameter of the pipes of the first group of tube bundle devices 311 and the second group of tube bundle devices 312 is 10-18 mm, the pipe length is 30-80 mm, and the number of pipes is determined according to the designed sizing amount.

[0021] In one embodiment of the invention, the pipes of the first group of tube bundle devices 311 and the second group of tube bundle devices 312 are made of organic glass, and the inner walls are polished and have a roughness equal to or less than 0.6.

[0022] In one embodiment of the invention, the fasteners of the inclined wire headbox with ultrasonic device are all made of SUS304 stainless steel.

[0023] The application of the inclined wire headbox with ultrasonic device includes:

[0024] Step 1: The papermaking pulp is pumped into the pulp distributor 203, and the pulp distributor 203 disperses the papermaking pulp so that the papermaking pulp flows out of the pulp distributor 203 through multiple fine pulp outlet pipes and then enters the first group of tube bundle devices 311 through the multi-tube pulp inlet device 101;

[0025] Step 2: The first tube bundle device 311 cuts the papermaking pulp longitudinally into a plurality of cylindrical pulps, and then sends them into the mixing chamber 306;

[0026] Step 3: Mixing: The cylindrical papermaking slurry is mixed in the mixing chamber 306 to become uniform.

[0027] Step 4: The mixed papermaking pulp enters the second set of tube bundle devices 312, which cuts the papermaking pulp longitudinally into square columnar pulp again;

[0028] Step 5: After exiting the second tube bundle device 312, the papermaking slurry enters the stabilizing chamber 307. After entering the stabilizing chamber 307, the papermaking slurry becomes a whole again, further improving the uniformity. The inner wall of the fixed upper cover 303 contacts the papermaking slurry. After the ultrasonic device array 202 is turned on, ultrasonic waves are transmitted through the fixed upper cover 303 of the headbox body into the papermaking slurry inside the headbox body, dispersing the papermaking slurry and keeping the interior of the headbox body clean.

[0029] Step 6: The fibers in the papermaking slurry begin to deposit and flocculate on the surface of the forming wire 112, and are dehydrated under the action of the dewatering box 204. The papermaking slurry gradually forms a fiber layer on the forming wire 112; the forming wire 112 moves while dragging the deposited fiber layer, and then exits the headbox through the gap between the upper lip plate 304 and the forming wire 112.

[0030] The ultrasonic device performs ultrasonic treatment on the papermaking pulp throughout the entire process from the papermaking pulp entering the headbox to the formation of the fiber layer.

[0031] In one embodiment of the present invention, the first group of tube bundle devices 311 and the second group of tube bundle devices 312 are both provided with a taper, and the taper is set in the range of 1°-10° to generate pressure drop and micro-turbulence to hinder the entanglement and flocculation between fibers; the micro-turbulence gradually decays when entering the stabilizing chamber 307, and the micro-turbulence completely disappears when the papermaking pulp approaches the forming mesh 112, and the fiber flocculation tendency gradually increases.

[0032] Beneficial effects of the present invention:

[0033] 1. The present invention is equipped with an ultrasonic device, multiple pulp inlet pipes and a tube bundle device, which can effectively disperse the papermaking pulp, solve the problem of poor paper uniformity caused by re-flocculation between dispersed fibers in the papermaking pulp, and improve paper quality.

[0034] 2. The present invention is provided with a movable upper cover, which is convenient for opening and inspecting and cleaning the interior of the box at any time.

[0035] 3. The present invention is provided with an upper lip plate safety device to ensure the safety of the equipment.

[0036] 4. The present invention utilizes the characteristics of ultrasonic devices to disperse synthetic fibers to solve the problem of adhesives in papermaking pulp adhering to the inner wall of the headbox, so that the headbox has a self-cleaning function and improves production efficiency.

[0037] 5. The present invention can use fibers with a length of 2 to 8 mm to produce high-quality specialty paper with good uniformity and high air permeability; it can even break through the bottleneck that makes it difficult to achieve industrial production of certain specialty papers in China.

[0038] 6. The present invention is provided with a water sealing device to prevent slurry blockage in the side wall panels and tearing of the forming mesh.

[0039] 7. The tube bundle device of the present invention is provided with a taper, which is conducive to uniform dispersion of the slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the external structure of the headbox body of the present invention.

[0041] Figure 2 It is a schematic diagram of the internal structure of the headbox of the present invention.

[0042] Figure 3 It is a schematic diagram of the fixed upper cover structure of the present invention.

[0043] Figure 4 This is a sample of aramid fiber paper made without using the ultrasonic device of the present invention.

[0044] Figure 5 This is a sample of aramid fiber paper made by turning on the ultrasonic device of the present invention.

[0045] Figure 6 This is a paper sample diagram showing paper defects caused by adhesive accumulation in the headbox.

[0046] In the figure, 101: multi-tube pulp feeding device, 102: upper lip plate safety device, 103: headbox upper lip plate height adjustment device, 104: headbox lower lip plate height adjustment device, 105: pneumatic opening and closing device, 106: side wall plate, 107: bracket, 108: lifting and lowering device, 109: observation hole, 110: breast roller, 111: water sealing device, 112: forming wire, 202: ultrasonic device array, 203: pulp distributor, 204: dewatering box, 301: pulp feeding pipe, 302: movable upper cover, 303: fixed upper cover, 304: upper lip plate, 305: lower lip plate, 306: mixing chamber, 307: flow stabilization chamber, 308: bottom plate, 311: first group of tube bundle devices, 312: second group of tube bundle devices. DETAILED DESCRIPTION

[0047] Example 1

[0048] like Figure 1 、 Figure 3 As shown, the external structure of the inclined wire headbox with ultrasonic device includes a multi-tube pulp feeding device 101, an upper lip plate safety device 102, a headbox upper lip plate height adjustment device 103, a headbox lower lip plate height adjustment device 104, a side wall plate 106, a bracket 107, a lifting and lowering device 108, an observation hole 109, a water sealing device 111, and a forming wire 112. The bracket 107 is used to support the box body, and the lifting and lowering device 108 is connected to the bracket 107 to adjust the opening and closing of the headbox.

[0049] The sidewall panels 106 are panels on the left and right sides of the box body. Observation holes are provided on the sidewall panels 106 for observing the pulp feeding situation. The sidewall panels 106 are welded and made of SUS304 stainless steel plates with a thickness of 6-20 mm. The contact surface with the papermaking pulp is polished to a surface roughness of equal to or less than 0.6. The observation holes are made of transparent organic glass. Water sealing devices 111 are provided below the sidewall panels 106. The water sealing devices 111 are labyrinth-type polymer sealing strips for preventing pulp blockage in the sidewall panels and tearing of the forming mesh.

[0050] The multi-tube pulp feeding device 101 is composed of multiple pulp feeding pipes 301, which are used to ensure that the pressure and profile of the papermaking pulp are uniform;

[0051] The upper lip plate safety device 102 is located in a cylinder, a cylinder fixing seat, a rotating shaft, a bolt and a pressure sensor, and is pneumatically controlled. When the pressure sensor detects overpressure inside the box, the upper lip plate will be automatically lifted through the cylinder, the cylinder fixing seat, the rotating shaft and the bolts to protect the safety of the equipment;

[0052] The upper lip height adjustment device 103 includes a screw lift and a handwheel, and the lower lip height adjustment device 104 includes a screw lift, a drive motor and a handwheel, both of which can be electrically adjusted and manually fine-tuned. All the screw lifts are made of SUS304 stainless steel.

[0053] like Figure 2 The pulp distributor 203 is connected to multiple pulp inlet pipes 301, and the interior of the inclined mesh flow box with an ultrasonic device includes a movable upper cover 302, a fixed upper cover 303, an upper lip plate 304, a lower lip plate 305, a mixing chamber 306, a stabilizing chamber 307, a bottom plate 308, a first group of tube bundle devices 311, and a second group of tube bundle devices 312; the first group of tube bundle devices 311 and the second group of tube bundle devices 312 are both composed of multiple pipes; the mixing chamber 306 is the space between the two groups of tube bundle devices in the flow box body; the stabilizing chamber 307 is the space between the second group of tube bundle devices 312 and the forming mesh 112 in the flow box body.

[0054] Preferably, both the first group of tube bundle devices 311 and the second group of tube bundle devices 312 have a taper, and the taper is between 1° and 10°, which is used to generate pressure drop and micro-turbulence to prevent entanglement and flocculation between fibers. The pipes of the first group of tube bundle devices 311 are round pipes, and the pipes of the second group of tube bundle devices 312 are square pipes; the average straight-line distance between the second group of tube bundle devices and the forming mesh is 200-600mm; the pipe diameters of the first group of tube bundle devices 311 and the second group of tube bundle devices 312 are 10-18mm, the pipe lengths are 30-80mm, and the number of pipes is determined according to the designed sizing amount. The pipes of the first group of tube bundle devices 311 and the second group of tube bundle devices 312 are made of organic glass, and the inner walls are ground and polished, with a roughness equal to or less than 0.6.

[0055] The movable upper cover 302 is provided with a pneumatic opening and closing device 105, which includes a cylinder, a cylinder fixing seat, a rotating shaft and a bolt. The opening and closing of the movable upper cover 302 is pneumatically controlled. After opening the movable upper cover 302, it is convenient to inspect and clean the interior of the box. The fixed upper cover 303 is connected to the upper lip plate 304 and is located at the top of the flow stabilization chamber 307.

[0056] like Figure 3 As shown, the fixed upper cover 303 is provided with an ultrasonic device array 202, and the ultrasonic device 202 array is composed of a number of ultrasonic vibration mechanisms, and the ultrasonic vibration mechanisms are ultrasonic vibration plates or ultrasonic vibrators. The ultrasonic device array can be fully opened or partially opened according to actual production needs.

[0057] Preferably, the fasteners of the inclined mesh headbox with ultrasonic device are all made of SUS304 stainless steel.

[0058] Working principle of the present invention:

[0059] The papermaking slurry enters the distributor 203, where it is dispersed and flows out of the distributor 203 through multiple fine outlet pipes. These outlet pipes correspond one-to-one with the inlet pipes 301 of the multi-tube inlet device 101 on the headbox. The papermaking slurry then enters the first set of tube bundles 311 through the multi-tube inlet device 101. In the first set of tube bundles 311, the papermaking slurry is longitudinally cut into several cylindrical slurries. The tapered tubes in the tube bundles vary the slurry's flow rate and pressure, creating a pressure drop and micro-turbulence. This micro-turbulence reduces fiber aggregation and promotes uniform dispersion. After exiting the first set of tube bundles 311, the papermaking slurry enters the mixing chamber 306, where the cylindrical slurry is mixed into a single unit, resulting in a more uniform overall papermaking slurry. After mixing, the papermaking slurry enters the second set of tube bundles 312, which further longitudinally cuts the papermaking slurry into square cylindrical slurry. The tube bundles have tapered pipes, which change the slurry's flow rate and pressure, generating a pressure drop and micro-turbulence. Micro-turbulence reduces fiber aggregation and promotes uniform dispersion of the slurry. After exiting the second set of tube bundles 312, the papermaking slurry enters the stabilization chamber 307. Once inside, the slurry becomes a unified whole, achieving improved uniformity. The micro-turbulence gradually subsides within the chamber, and the fibers tend to flocculate. By the end of the stabilization chamber 307, the micro-turbulence has completely dissipated, and the fibers in the papermaking slurry begin to deposit and flocculate on the surface of the forming wire. Dewatering is then performed in the dewatering box 204, and the papermaking slurry gradually forms a fiber layer on the forming wire 112. The forming wire 112 drags the deposited fiber layer along, then exits the headbox through the gap between the upper lip and the forming wire 112. The ultrasonic device array 202 is located on the outer wall of the fixed upper cover 303 of the headbox body. The inner wall of the fixed upper cover 303 contacts the papermaking slurry. When the ultrasonic device array 202 is turned on, ultrasonic waves are transmitted through the fixed upper cover 303 of the headbox body into the papermaking slurry inside the headbox body. The ultrasonic waves disperse the papermaking slurry and keep the headbox body clean. From the time the papermaking slurry enters the headbox body to the time the fiber layer is formed, the ultrasonic device continuously treats the papermaking slurry to reduce fiber aggregation and keep the headbox wall clean. Experiments have shown that ultrasonic waves help disperse fibers in dynamic slurries but do not affect the settling of fibers in static slurries.

[0060] Comparative Example 1

[0061] In the case of Example 1, the ultrasonic device array 202 is not turned on.

[0062] See also Figure 4When the ultrasonic device array 202 is turned off, the aramid fiber paper produced has poor paper uniformity due to the aramid fibers agglomerating.

[0063] like Figure 5 As shown in FIG1 , the aramid fiber paper produced by using the inclined wire headbox with ultrasonic device provided in Example 1 has a paper sheet uniformity significantly better than that of Figure 5 Aramid fiber paper made by an inclined wire headbox without an ultrasonic device is shown.

[0064] Comparative Example 2

[0065] Continuous production was carried out using an inclined wire headbox without an ultrasonic device, and the rest was the same as in Example 1.

[0066] See also Figure 6 Since the inclined wire headbox without ultrasonic device does not have self-cleaning function, when making chemical fiber paper, the pulp contains more adhesives. As the production continues, the adhesives adhere and accumulate in the headbox and eventually fall off, resulting in a large number of adhesive flocs adhering to the surface of the paper sheet, causing paper defects and affecting production efficiency.

[0067] Test: The thickness and tensile index of the paper samples obtained in Example 1 and Comparative Example 1 were measured using an electric thickness tester and a microcomputer tensile strength tester. The basis weight of the paper samples obtained in Example 1 and Comparative Example 1 was 40 g / m 2 The thickness of each paper sample was measured at 12 points. The tensile index of each paper sample was measured at 4 points, with both the longitudinal and transverse tensile index measured at each point. The thickness test results are shown in Table 1 below, and the tensile index test results are shown in Table 2 below.

[0068] Table 1 Thickness of two paper samples (unit: μm)

[0069]

[0070] Table 2 Tensile index of two paper samples (unit: N·m / g)

[0071]

[0072] From the results in Table 1, it can be seen that the variance of the thickness of the paper sample obtained in Comparative Example 1 is significantly greater than the variance of the thickness of the paper sample obtained in Example 1, which indicates that the thickness uniformity of the paper sample in Example 1 is significantly better than that of the paper sample obtained in Comparative Example 1.

[0073] From the results in Table 2, it can be seen that the tensile index of the paper sample obtained in Example 1 is significantly better than that of the paper sample obtained in Comparative Example 1. The low tensile index of the paper sample obtained in Comparative Example 1 is caused by the poor uniformity of fiber arrangement in the paper sample.

[0074] The data in Tables 1 and 2 fully demonstrate that the uniformity of the paper sample obtained in Example 1 is significantly better than that of the paper sample obtained in Comparative Example 1, and the uniformity of the paper made by the inclined wire headbox with an ultrasonic device is significantly better than that of the paper made by the existing inclined wire headbox.

[0075] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. An inclined wire headbox with an ultrasonic device, characterized in that: The external structure includes a multi-tube pulp feeding device (101), an upper lip plate safety device (102), a headbox upper lip plate height adjustment device (103), a headbox lower lip plate height adjustment device (104), a side wall plate (106), a bracket (107), a lifting and lowering device (108), an observation hole (109), a water sealing device (111), and a forming mesh (112); The multi-tube pulp feeding device (101) is composed of a plurality of pulp feeding pipes (301); The upper lip plate safety device (102) is located on the upper surface of the upper lip plate (304) and includes a cylinder, a cylinder fixing seat, a rotating shaft, a bolt and a pressure sensor; The upper lip plate height adjustment device (103) is located on the upper surface of the movable upper cover (302) and includes a screw lift and a hand wheel, and the lower lip plate height adjustment device (104) includes a screw lift, a drive motor and a hand wheel; The side wall panels (106) are panels on the left and right sides of the box body. The side wall panels (106) are provided with the observation holes (109). Water sealing devices (111) are provided below the side wall panels (106). The water sealing devices (111) are labyrinth-type polymer sealing strips used to prevent slurry blockage in the side wall panels and tearing of the forming mesh. The bracket (107) is used to support the box body, and the lifting device (108) is connected to the bracket (107) and is used to adjust the opening and closing of the headbox; The interior of the inclined mesh headbox with ultrasonic device comprises a movable upper cover (302), a fixed upper cover (303), an upper lip plate (304), a lower lip plate (305), a mixing chamber (306), a flow stabilization chamber (307), a bottom plate (308), a first group of tube bundle devices (311), and a second group of tube bundle devices (312); the first group of tube bundle devices (311) and the second group of tube bundle devices (312) are both provided with a taper, and the taper is set in the range of 1°-10°, so as to generate pressure drop and micro-turbulence, thereby preventing entanglement and flocculation between fibers; the first group of tube bundle devices The pipes of the first tube bundle device (311) are round pipes, and the pipes of the second tube bundle device (312) are square pipes; the average straight-line distance between the second tube bundle device and the forming mesh is 200-600 mm; the pipe diameters of the first tube bundle device (311) and the second tube bundle device (312) are 10-18 mm, the pipe lengths are 30-80 mm, and the number of pipes is determined according to the designed sizing amount; the pipes of the first tube bundle device (311) and the second tube bundle device (312) are made of organic glass, and the inner walls are polished and the roughness is equal to or less than 0.6; The mixing chamber (306) is the space between the two groups of tube bundle devices in the headbox; the stabilizing chamber (307) is the space between the second group of tube bundle devices (312) and the forming wire (112) in the headbox; The movable upper cover (302) is located at the top of the mixing chamber (306) and is provided with a pneumatic opening and closing device (105). The pneumatic opening and closing device includes a cylinder, a cylinder fixing seat, a rotating shaft and a bolt, and the opening and closing of the movable upper cover (302) is controlled by pneumatics. The fixed upper cover (303) is connected to the upper lip plate (304) and is located on the top of the flow stabilization chamber (307); The fixed upper cover (303) is provided with an ultrasonic device array (202), and the ultrasonic device array (202) is composed of a plurality of ultrasonic vibration mechanisms, and the ultrasonic vibration mechanisms are ultrasonic vibration plates or ultrasonic vibrators; The first group of tube bundle devices (311) and the second group of tube bundle devices (312) are both composed of a plurality of tubes and are used for uniformly dispersing papermaking pulp.

2. The inclined wire headbox with ultrasonic device according to claim 1, characterized in that: A pulp distributor (203) is further provided on the outside of the inclined mesh headbox with an ultrasonic device, and the pulp distributor (203) is connected to the pulp inlet pipe (301).

3. The inclined wire headbox with ultrasonic device according to claim 1, characterized in that: All of the screw lifts are made of SUS304 stainless steel.

4. The inclined wire headbox with ultrasonic device according to claim 1, characterized in that: The side wall plate (106) is made of SUS304 stainless steel plates with a thickness of 6-20 mm by welding, and the surface in contact with the papermaking slurry is ground and polished, with a surface roughness equal to or less than 0.

6. The material of the observation hole is transparent organic glass.

5. The inclined wire headbox with ultrasonic device according to claim 1, characterized in that: The fasteners of the inclined mesh headbox with ultrasonic device are all made of SUS304 stainless steel.

6. Application of the inclined wire headbox with ultrasonic device according to claim 2, characterized in that: The applications include: Step 1: The papermaking pulp is pumped into the pulp distributor (203), and the pulp distributor (203) disperses the papermaking pulp so that the papermaking pulp flows out of the pulp distributor (203) through a plurality of fine pulp outlet pipes and then enters the first group of tube bundle devices (311) through the multi-tube pulp inlet device (101); Step 2: The first tube bundle device (311) cuts the papermaking pulp longitudinally into a plurality of cylindrical pulps, and then sends the cylindrical pulps into the mixing chamber (306); Step 3: Mixing: The cylindrical papermaking slurry is mixed in the mixing chamber (306) to become uniform; Step 4: the mixed papermaking pulp enters the second set of tube bundle devices (312), and the second set of tube bundle devices (312) cuts the papermaking pulp longitudinally into square columnar pulp again; Step 5: After exiting the second group of tube bundle devices (312), the papermaking pulp enters the steady flow chamber (307). After entering the steady flow chamber (307), the papermaking pulp becomes a whole again, further improving the uniformity; the inner wall of the fixed upper cover (303) contacts the papermaking pulp, and after the ultrasonic device array (202) is turned on, the ultrasonic wave is transmitted to the papermaking pulp inside the headbox through the fixed upper cover (303) of the headbox body, thereby dispersing the papermaking pulp and keeping the inside of the headbox body clean; Step 6: Fibers in the papermaking slurry begin to deposit and flocculate on the surface of the forming wire (112), and are dehydrated under the action of the dewatering box (204), and the papermaking slurry gradually forms a fiber layer on the forming wire (112); the forming wire (112) moves with the deposited fiber layer, and then passes through the gap between the upper lip plate (304) and the forming wire (112) and exits the headbox; The ultrasonic device performs ultrasonic treatment on the papermaking pulp throughout the entire process from the papermaking pulp entering the headbox to the formation of the fiber layer.

7. Application of the inclined wire headbox with ultrasonic device according to claim 6, characterized in that: The first group of tube bundle devices (311) and the second group of tube bundle devices (312) are both provided with a taper, and the taper is set within a range of 1°-10° to generate a pressure drop and micro-turbulence to prevent entanglement and flocculation between fibers; The micro-turbulence gradually decays when entering the steady flow chamber (307), and completely disappears when the papermaking pulp approaches the forming wire (112), and the fiber flocculation tendency gradually increases.

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