Pulp dreg removing device with a closing mechanism

Abstract

The utility model relates to paper pulp processing technical field, concretely relates to paper pulp deslagging device adopting closing mechanism, including cylinder and inlet, the cylinder includes cylinder section and taper cylinder section, and sets up closing mechanism between cylinder section and taper cylinder section, the top of cylinder section is detachably arranged top cap, and top cap is set up conical flow guide body, the utility model can use single or a pair of inlet to replace pressure screen, the number of cylindrical flow guide hole on the upper surface of conical ring is designed according to the concentration difference of pulp, this design guarantees the processing efficiency of different concentration pulp, solves the problem of screen gap blockage and complex production process in the prior art, and the big round angle of conical ring entrance reduces the impact energy loss of pulp, simultaneously, also reduces the winding of fiber due to impact, and the small round angle of outlet forms micro-turbulent flow, reduces the residual amount of fiber, improves deslagging efficiency, effectively deals with the " quasi-solid " mass condition formed by high concentration pulp.

Description

Technical Field

[0001] This utility model relates to the field of pulp treatment technology, and specifically to a pulp deslagging device employing a closed mechanism. Background Technology

[0002] With the paper industry facing a shortage of pulp raw materials, more paper mills are using waste paper as pulp raw material. However, waste paper contains many impurities, and the treatment of light impurities has become a key problem that existing manufacturers urgently need to solve. Currently, the main methods for treating light impurities include thermal dispersion and pressure screening. Thermal dispersion can only disperse light impurities such as wax, hot melt adhesive, and polyethylene, but cannot completely remove them. Pressure screening uses extremely fine screen gaps to filter impurities, but when using pressure screens with extremely fine screen gaps, large pressure is often required to ensure smooth filtration, which can easily lead to screen blockage and further increase the complexity of the production process. It is particularly noteworthy that under high-concentration pulp conditions, the fiber network will form "solid-like" clumps. This special physical characteristic will significantly disrupt the stability of the eddy current, causing a sharp decline in the separation efficiency of traditional slag removal devices. This is also one of the important challenges currently facing the technology.

[0003] Furthermore, the aforementioned existing technologies also lack separate measures to address pulps with different concentrations, such as high and low concentrations.

[0004] Therefore, it is necessary to invent a pulp deslagging device with a closed mechanism to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a pulp deslagging device with a closed mechanism, which uses a single or a pair of pulp inlets to replace a pressure screen. The number of cylindrical guide holes on the upper surface of the conical ring is designed according to the difference in pulp concentration. This design not only ensures the processing efficiency of pulps of different concentrations, but also solves the problems of screen clogging and complex production processes in the prior art. The large rounded corner of the conical ring inlet reduces the loss of pulp impact energy. At the same time, it also reduces fiber entanglement due to impact, and the small rounded corner of the outlet forms micro-turbulence, reducing the amount of fiber residue. This improves the deslagging efficiency and effectively deals with the "solid-like" clumps formed by high-concentration pulp.

[0006] To achieve the above objectives, this utility model provides the following technical solution: It includes a cylinder and a slurry inlet. The cylinder comprises a cylindrical section and a conical section, with a closing mechanism between the cylindrical and conical sections. A top cover is detachably provided on the top of the cylindrical section, and a conical guide tube is provided through the top cover. A slurry inlet is provided on the side of the cylindrical section, and a good slurry outlet is provided at the bottom of the conical section. The outer diameter of the closing mechanism is the same as the inner diameter of the cylindrical section, and the closing mechanism adapts to different concentrations of slurry through vertical disassembly.

[0007] Preferably, the closing mechanism includes a stackable conical ring, with a guide hole on the upper surface of the conical ring, the guide hole being cylindrical.

[0008] Preferably, a fixed shaft is provided on the lower surface of the conical ring, and the outer diameter of the fixed shaft is the same as the inner diameter of the guide hole.

[0009] Preferably, the number of guide holes is 4 to 10.

[0010] Preferably, the upper and lower edges of the inner diameter of the conical ring are rounded.

[0011] Preferably, the diameter of the cylindrical section is the same as the top diameter of the conical section, and the cylindrical section and the conical section are fixedly connected.

[0012] This utility model also provides a pulp deslagging device, including a cylinder and a pulp inlet. The cylinder includes a cylindrical section and a conical section. A top cover is provided at the top of the cylindrical section, and a conical guide is provided through the top cover. A pulp inlet is provided on the side of the cylindrical section, and a good pulp outlet is provided at the bottom of the conical section. There are two pulp inlets, which are respectively provided on both sides of the cylindrical section, and the pulp inlets on both sides are centrally symmetrical.

[0013] Preferably, the slurry inlet has a tapered structure.

[0014] The technical effects and advantages provided by this utility model in the above technical solution are as follows: Traditional pressure screens require significant pressure to ensure effective filtration, which can easily lead to screen clogging and fiber residue. This new design employs a segmented structure with a cylindrical section and a conical section: the cylindrical section generates a stable vortex, while the conical section accelerates slurry separation through its gradually decreasing diameter. Simultaneously, the lower surface of the stacked conical rings in the closing mechanism is fitted with a fixed shaft that fits into the guide holes, ensuring axial positioning without requiring excessive pressure, preventing screen clogging, and simplifying the production process. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1 This is a side sectional view of Embodiment 1 of the present invention; Figure 2 This utility model Figure 1 Enlarged view of point A in the middle; Figure 3 This is an exploded view of Embodiment 1 of this utility model; Figure 4 This is an exploded view of the closing mechanism of Embodiment 1 of this utility model; Figure 5This is a perspective view of Embodiment 2 of the present invention without the top cover; Figure 6 This is a top view of Embodiment 2 of the present invention without the top cover; Explanation of reference numerals in the attached figures: 100. Cylinder body; 200. Slurry inlet; 101. Cylindrical section; 102. Conical section; 300. Closing mechanism; 400. Top cover; 500. Conical guide tube; 600. Impurity discharge pipe; 700. Good slurry outlet; 301. Conical ring; 302. Guide hole; 303. Fixed shaft; 800. Rounded corner. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0018] Example 1: This utility model provides the following... Figure 1-4 The pulp deslagging device with a closed mechanism 300 shown includes a cylinder 100 and a pulp inlet 200. The cylinder 100 includes a cylindrical section 101 and a conical section 102. The segmented structure realizes functional zoning. The cylindrical section 101 (located in the upper part) is responsible for forming vortices, and the conical section 102 (located in the lower part) accelerates pulp separation. A closed mechanism 300 is provided between the cylindrical section 101 and the conical section 102. The outer diameter of the closed mechanism 300 is the same as the inner diameter of the cylindrical section 101. The closed mechanism 300 located between the two sections (such as a stackable conical ring 301) serves as a physical connector, forming a stepped pressure gradient.

[0019] A detachable top cover 400 is provided on the top of the cylindrical section 101 (specifically, the top cover 400 has bolt holes, and the top of the cylindrical section 101 has the same bolt holes, through which bolts pass, connecting the top cover 400 and the cylindrical section 101 as a whole). A conical guide 500 is provided through the top cover 400 (specifically, the conical guide 500 is interference-fitted with the top cover 400, the outer wall of the conical guide 500 is welded to the top cover 400, and the conical guide 500 maintains vertical continuity). The conical structure of the cylinder 100 guides the slurry to form a stable vortex, with light slag accumulating in the low-pressure zone at the center. A discharge pipe 600 is installed at the bottom of the conical guide 500. The conical guide 500 and the discharge pipe 600 are coaxial. The bottom of the conical guide 500 is welded to the top of the discharge pipe 600. The conical guide 500 and the discharge pipe 600 are coaxial. Its geometry forms a low-pressure zone at the center of the vortex, causing light impurities (such as plastics and waxes) to accumulate towards the center of the cylinder 100, making it easy to discharge through the discharge pipe 600.

[0020] The bolted top cover 400 is used to seal the top of the cylindrical section 101, maintain the internal pressure environment, and prevent air disturbance from affecting the centrifugal separation effect.

[0021] A slurry inlet 200 is provided on the side of the cylindrical section 101 (specifically, the slurry inlet 200 is welded to the cylindrical section 101, and the slurry inlet 200 can remain unobstructed, allowing fluid to smoothly enter the cylindrical section 101). The slurry inlet 200 on the side allows the slurry to enter tangentially to the cylinder wall, enhancing the vortex intensity. A good slurry outlet 700 is provided at the bottom of the conical section 102. The bottom of the conical section 102 is narrowed, utilizing the combined effects of gravity and centrifugal force to concentrate and discharge the purified slurry. High-concentration slurry easily forms "solid-like" clumps, which disrupts the vortex stability and leads to a decrease in separation efficiency. The above solution solves this problem by matching the tangential design of the slurry inlet 200 with the diameter of the cylindrical section 101 + conical section 102: the slurry inlet 200 is set tangentially to the cylinder wall, so that a strong vortex is formed immediately after the slurry enters.

[0022] The closing mechanism 300 includes a stackable conical ring 301, and a guide hole 302 is provided on the upper surface of the conical ring 301. The guide hole 302 is cylindrical.

[0023] 4-10 cylindrical guide holes 302, preferably 4 or 10 cylindrical guide holes 302, the specific design scheme is as follows: 302 configuration with 4 flow guide holes: suitable for low-concentration slurries (≤2%), increasing the flow rate per hole by reducing the number of holes and preventing low-speed clogging.

[0024] Ten guide holes 302 configuration: For high-concentration slurries (≥5%), the multi-hole diversion reduces local flow velocity and avoids fiber shear damage. The guide holes 302 are evenly distributed in a circumferential array, and the center distance between adjacent holes is strictly maintained at a ratio of 3:1 to the hole diameter, effectively eliminating eddy current interference.

[0025] A fixed shaft 303 is provided on the lower surface of the conical ring 301, and the outer diameter of the fixed shaft 303 is the same as the inner diameter of the guide hole 302. Ten fixed shafts 303 are provided on the lower surface of the conical ring 301 with four guide holes 302. This is to allow for overlapping and cooperation with the conical ring 301 with ten guide holes 302. When all ten guide holes 302 are needed, the conical ring 301 with four guide holes 302 on its upper surface is disassembled and removed. This design meets the processing requirements of slurries of different concentrations. In other words, the closing mechanism 300 adapts to different slurry concentrations through vertical disassembly, solving the problems of screen clogging and complex production processes in existing technologies.

[0026] Finally, in order to accommodate slurries of different concentrations, the bottom conical ring 301 was welded to the cylinder 100.

[0027] The fixed shaft 303 of the upper conical ring 301 and the lower guide hole 302 form a detachable fit (that is, the fixed shaft 303 is embedded in the guide hole 302), achieving axial positioning, that is: the cumulative overlap error is ≤0.1mm / layer, ensuring the straightness of the flow channel; the fixed shaft 303 is made of 316L stainless steel.

[0028] The upper and lower edges of the inner diameter of the conical ring 301 are rounded with 800° radius. The radius R = 1mm-5mm, the large radius R = 3mm-5mm, and the small radius R = 1mm-3mm. The large radius 800° at the inlet of the conical ring 301 reduces the loss of impact energy of the slurry. At the same time, it also reduces the fiber entanglement caused by impact. The small radius 800° at the outlet creates micro-turbulence, reducing the amount of fiber residue. It improves the slag removal efficiency and effectively deals with the "solid-like" clumps formed by high-concentration slurry.

[0029] The diameter of the cylindrical section 101 is the same as the top diameter of the conical section 102, and the cylindrical section 101 and the conical section 102 are fixedly connected. The tops of the cylindrical section 101 and the conical section 102 maintain a strictly equal diameter, eliminating the "local low-pressure zone caused by the Bernoulli effect" in the traditional variable-diameter structure of the prior art. When the slurry enters the conical section 102 from the cylindrical section 101, the tangential velocity V θ Keep it constant.

[0030] Existing thermal dispersion methods can only disperse light impurities such as wax and hot melt adhesives, but cannot completely remove them. Example 1 achieves graded sieving through the porous structure of the closed mechanism 300 (i.e., stacked conical rings 301). The number of cylindrical guide holes 302 on the upper surface of the conical rings 301 is designed according to the slurry concentration. For low-concentration slurries (≤2%), four guide holes 302 are used (to increase the flow rate per hole and prevent impurities from clogging at low speeds). For high-concentration slurries (≥5%), ten guide holes 302 are used (multiple holes reduce local flow velocity and avoid fiber shear damage). This design ensures efficient processing of slurries of different concentrations while efficiently removing light impurities through physical sieving.

[0031] Example 2: The difference between this example and Example 1 is that this example provides a pulp deslagging device, such as... Figures 5-6 As shown, the system includes a cylinder 100 and a slurry inlet 200. The cylinder 100 comprises a cylindrical section 101 and a conical section 102. A top cover 400 is provided at the top of the cylindrical section 101, and a conical guide 500 is provided through the top cover 400. The slurry inlet 200 is provided on the side of the cylindrical section 101, and a good slurry outlet 700 is provided at the bottom of the conical section 102. There are two slurry inlets 200, which are respectively located on both sides of the cylindrical section 101 and are centrally symmetrical. The centrally symmetrical arrangement of the two slurry inlets 200 generates two vortices with a phase difference of π. The superposition effect of these vortices is as follows: enhanced velocity field: the tangential velocity is increased, and the uniformity of impurity separation is improved. The two slurry streams converge at the bottom 1 / 3 to 1 / 4 of the conical guide 500, forming a "double helix-single core" flow structure, where the single core refers to the cylinder 100. The efficiency of light impurities accumulating in a single core is improved. The slurry inlet 200 has a tapered structure, which accelerates the slurry flow rate and enhances the initial centrifugal force.

[0032] The other design schemes in this embodiment are the same as those in Embodiment 1.

[0033] The number, position, and size of the conical ring 301 and the fixed shaft 303 in the attached figures are for illustrative purposes only, and those skilled in the art can make adjustments or improvements according to the actual situation.

[0034] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pulp deslagging device employing a closed mechanism, comprising a cylinder and a pulp inlet, characterized in that, The cylinder body includes a cylindrical section and a conical section, with a closing mechanism between the cylindrical and conical sections. A top cover is detachably installed on the top of the cylindrical section, and a conical guide is installed through the top cover. A slurry inlet is installed on the side of the cylindrical section, and a good slurry outlet is installed at the bottom of the conical section. The outer diameter of the closing mechanism is the same as the inner diameter of the cylindrical section, and the closing mechanism can adapt to different concentrations of slurry by vertical disassembly.

2. The pulp deslagging device employing a closed mechanism as described in claim 1, characterized in that, The closing mechanism includes stackable conical rings, with guide holes on the upper surface of the conical rings, the guide holes being cylindrical.

3. The pulp deslagging device employing a closed mechanism as described in claim 2, characterized in that, A fixed shaft is provided on the lower surface of the tapered ring, and the outer diameter of the fixed shaft is the same as the inner diameter of the guide hole.

4. The pulp deslagging device employing a closed mechanism as described in claim 3, characterized in that, The number of guide holes is 4 to 10.

5. The pulp deslagging device employing a closed mechanism as described in claim 3, characterized in that, The upper and lower edges of the inner diameter of the conical ring are rounded.

6. The pulp deslagging device employing a closed mechanism as described in claim 1, characterized in that, The diameter of the cylindrical section is the same as the top diameter of the conical section, and the cylindrical section and the conical section are fixedly connected.

7. A pulp deslagging device, characterized in that, The invention includes a cylinder and a slurry inlet. The cylinder comprises a cylindrical section and a conical section. A top cover is provided at the top of the cylindrical section, and a conical guide is provided through the top cover. A slurry inlet is provided on the side of the cylindrical section, and a good slurry outlet is provided at the bottom of the conical section. There are two slurry inlets, which are respectively provided on both sides of the cylindrical section, and the two slurry inlets are centrally symmetrical.

8. The pulp deslagging device as described in claim 7, characterized in that, The slurry inlet has a tapered structure.

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