Treatment and recovery equipment for waste pulp in paper product production

Abstract

The utility model discloses treatment and recovery equipment for waste pulp in paper product production, which relates to the technical field of paper product processing and comprises a tank body and a pulp outlet pipe, the pulp outlet pipe is fixedly arranged at the central position of the upper part of the tank body, and a pipe orifice vertically extends into the tank body and extends to the middle of the tank body; the lower side of the tank body is movably connected with a plurality of combined wall sheets, the plurality of combined wall sheets are circumferentially arranged around the central axis of the tank body, and the inner cavity wall of the tank body is jointly enclosed in a manner that the adjacent combined wall sheets are obliquely overlapped; when the device is used for treating, waste slurry tangentially enters from the upper side of the tank body, and naturally forms a spiral inner rotational flow along with the wall surface of the inner cavity in the process of flowing downwards along with gravity, so that solid impurities and cellulose slurry in the waste slurry are centrifugally separated, the cellulose slurry is sucked away and recycled by the slurry outlet pipe in the center, and the impurities are spirally discharged downwards; the device has the characteristic of high-efficiency separation of slag and slurry.

Description

Technical Field

[0001] This utility model relates to the field of paper product processing technology, specifically to a device for treating and recycling waste slurry from paper product manufacturing. Background Technology

[0002] The papermaking process mainly consists of two stages: pulping and papermaking. Pulping involves separating cellulose from plant materials using a series of mechanical and chemical methods, followed by bleaching to create pulp. Papermaking involves diluting the pulp, spraying it onto a wire mesh, pressing it to dry the moisture, and then producing paper. In the pulping process, to ensure the cleanliness of the paper produced in subsequent papermaking, only the portion of the pulp with high brightness and low impurity content is separated and selected. This process generates a large amount of waste pulp with high impurity content, which contains a significant amount of unused pulp. Furthermore, in the papermaking process, the waste liquid obtained after removing water also contains some lost pulp raw materials.

[0003] Because the waste liquid contains a large number of solid impurities of different particle sizes, the pulp in the two parts of the waste liquid mentioned above is difficult to recover through ordinary simple filtration. If it is discarded directly, it will cause great waste and reduce the utilization rate of raw materials. If a step-by-step filtration method is adopted for recovery, the filter screen needs to be cleaned frequently to prevent clogging. This not only consumes additional cleaning procedures but is also inefficient and cannot handle the large amount of waste liquid generated in production in a timely manner. Utility Model Content

[0004] To address the technical problem mentioned in the background section regarding the need to recover lost pulp raw materials from waste pulp, a waste pulp treatment and recovery device for paper product manufacturing is proposed. This device utilizes the principle of centrifugal separation to separate and recover the required cellulose-containing pulp from impurity particles during the rotation of the waste pulp, thereby improving the utilization rate of raw materials.

[0005] This utility model discloses a waste pulp treatment and recycling device for paper product production, including a tank and a pulp outlet pipe. The pulp outlet pipe is fixedly installed at the upper center of the tank, with the pipe opening vertically entering the tank and extending to the middle of the tank. A combination wall plate is movably connected to the lower side of the tank. Several combination wall plates are arranged circumferentially around the central axis of the tank and together form the inner cavity wall of the tank by overlapping adjacent combination wall plates at an incline.

[0006] As a further improvement of this utility model, a slurry inlet is provided on the upper side wall of the tank, and the direction of the slurry inlet is horizontally tangent to the contour of the inner cavity wall of the tank.

[0007] As a further improvement of this utility model, a number of wall plate connecting seats are rotatably connected to the lower side of the tank body. The wall plate connecting seats have the ability to swing towards or away from the center of the tank body. Each wall plate connecting seat is rotatably connected to a combined wall plate below it, which swings synchronously with it.

[0008] As a further improvement of this utility model, the combined wall pieces are provided with an inclined wall surface on one side. When the combined wall pieces are stacked together, the inclined wall surface of any combined wall piece overlaps and adheres to the side of the adjacent combined wall piece that is not provided with an inclined wall surface. All the combined wall pieces together form an inverted cone-shaped combination that is larger at the top and smaller at the bottom, which serves as the lower extension structure of the tank.

[0009] As a further improvement of this utility model, it also includes several sets of driving cylinders, each set of driving cylinders being connected to a combined wall plate. Each set of driving cylinders includes a swing cylinder and a deflection cylinder. The fixed end of the swing cylinder is rotatably connected to the outside of the tank body, and the driving end is movably connected to the outer wall surface of the combined wall plate. When the driving end extends, it can drive the combined wall plate to swing towards the inside of the tank body. When the driving end retracts, it can drive the combined wall plate to swing towards the outside of the tank body. The fixed end of the deflection cylinder is rotatably connected to the outer wall surface of the combined wall plate, and the driving end of the deflection cylinder is rotatably connected to the driving end of the swing cylinder. When the driving end of the deflection cylinder extends, it can drive the end of the combined wall plate with the inclined wall surface to deflect towards the outside of the tank body. When the deflection cylinder retracts, it can drive the end of the combined wall plate with the inclined wall surface to deflect towards the inside of the tank body.

[0010] As a further improvement of this utility model, it also includes an outer shell, the inside of which is formed with a hollow cavity, and several supporting feet extending from the outer wall of the outer shell; the outer shell is fixedly connected to the tank body and is sleeved on the outside of the tank body, thus enclosing the circumferentially arranged combined wall pieces as a whole.

[0011] As a further improvement of this utility model, the outer wall of the slurry outlet pipe is provided with spirally extending guide vanes, and the spiral direction of the guide vanes is consistent with the liquid flow cutting direction at the slurry inlet.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] I. This utility model allows slurry to be fed tangentially from the top side of the tank, so that the waste slurry naturally forms a spiral internal flow with the inner wall surface as it flows down with gravity. This centrifugally separates solid impurities and cellulose slurry in the waste slurry. The cellulose slurry is sucked away and recycled by the central slurry outlet pipe, while the impurities are spirally discharged downwards. This method has the characteristics of highly efficient separation of slag and slurry, and there is no risk of impurities clogging the equipment during filtration.

[0014] II. The cone angle of the inverted cone structure formed by the combined wall panels of this utility model can be adjusted. By changing the inner cavity with different cone angles, different centrifugal separation effects can be applied to the impurity components in the waste slurry: a larger cone angle can achieve higher slag and slurry separation efficiency, while a smaller cone angle can achieve a higher precision slag removal effect. The specific cone angle can be selected and changed according to the specific impurity content and particle size in the waste slurry.

[0015] Third, the outlet of this utility model is tangent to the horizontal contour of the inner cavity wall of the tank, and the direction of rotation of the guide vanes on the outside of the outlet pipe is the same as the direction of liquid flow ingress at the outlet, which can increase the swirling effect of the liquid flow and improve the centrifugal separation effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the internal composite wall panel assembly after the outer shell is partially cut apart according to this utility model;

[0018] Figure 3 This is a schematic diagram of the tank body and the combined wall panel assembly of this utility model after half-section.

[0019] Figure 4 This is a schematic diagram of the specific connection structure between the combined wall panel, the wall panel connecting seat, and the tank body of this utility model (wherein) Figure 4 The enlarged diagram on the left shows the deflection motion of the combined wall panels relative to the wall panel connecting seat, while the enlarged diagram on the right shows the swing motion of the wall panel connecting seat relative to the tank body.

[0020] Figure 5 This is a schematic diagram of the structure of adjacent combined wall panels of this utility model being superimposed and enclosed by each other;

[0021] Figure 6 This is a schematic diagram of the internal liquid flow direction of this utility model;

[0022] Figure 7 The diagram shows a comparison of the changes in the upper and lower openings and the cross-sectional cone angle of the combined structure before and after the deformation of the combined wall panels of this utility model. Figure 7 The cone angle of the combined wall panels on the left is smaller than that on the right.

[0023] 1. Tank body; 101. Combined wall panels; 1011. Inclined wall surface; 102. Slurry inlet; 103. Wall panel connecting seat; 2. Slurry outlet pipe; 201. Guide vane; 3. Drive cylinder; 301. Swing cylinder; 302. Deflection cylinder; 4. Outer shell; 401. Support foot. Detailed Implementation

[0024] Specific Implementation Example 1: Please refer to the appendix Figure 1 -Appendix Figure 7

[0025] like Figure 1 As shown, a waste pulp treatment and recycling device for paper product manufacturing includes a tank 1, a pulp outlet pipe 2, a drive cylinder 3, and a shell 4.

[0026] like Figure 3As shown, the tank body 1 is a hollow cavity with a horizontal cross-section of a circle. A vertical slurry outlet pipe 2 is provided at the upper axial position of the tank body 1, which enters the inner cavity of the tank body 1. The middle and lower parts of the tank body 1 have an inverted conical structure that gradually decreases in size. A slurry inlet 102 is provided on the lower middle cavity wall of the tank body 1. The opening direction of the slurry inlet 102 is horizontally tangent to the contour of the inner cavity wall of the tank body 1.

[0027] like Figure 2 and Figure 4 As shown, 20 wall plate connecting seats 103 are arranged circumferentially around the central axis of the pipe at the lower end of the tank body 1, as follows: Figure 4 As shown in the enlarged view on the right, each wall plate connecting seat 103 is rotatably connected to the tank body 1 and is orthogonal to the central axis of the tank body 1. As the rotation angle of the wall plate connecting seat 103 changes, it can swing towards or away from the center of the tank body 1.

[0028] Furthermore, each wall panel connector 103 has a horizontal platform at its lower part, and a combined wall panel 101 is rotatably connected below the platform. The combined wall panel 101 extends in a direction perpendicular to the platform of the wall panel connector 103. The left and right side walls of the combined wall panel 101 slope inwards towards its vertical center, forming an inverted trapezoidal plate that is wider at the top and narrower at the bottom. Figure 4 As shown in the enlarged view on the left, the combined wall panel 101 deflects relative to the wall panel connecting seat 103, which can cause one side of the left and right side of the combined wall panel 101 to deflect towards the outside of the tank body 1 and the other side to deflect towards the inside of the tank body 1.

[0029] Furthermore, on the wall surface of the combined wall piece 101 facing away from the tank body 1, the right-side corner portion of the outer wall is shaved off to form an inclined wall surface 1011 structure. The side of each of the 20 combined wall pieces 101 with the inclined wall surface 1011 is deflected at the same angle towards the inside of the tank body 1, and all 20 combined wall pieces 101 swing towards the inside of the tank body 1 along with the wall piece connecting seat 103. Figure 5 As shown, the inclined wall surfaces of each composite wall piece 101 are superimposed and adhered to the wall surfaces of adjacent composite wall pieces 101 facing the inner side of the tank body 1, with the inner wall surfaces of adjacent composite wall pieces 101 forming an obtuse angle transition. After the 20 composite wall pieces 101 are superimposed according to the above positional relationship, they together form an inverted conical composite body that is larger at the top and smaller at the bottom. The horizontal cross-section of the composite body is a nearly circular 20-sided polygon, as shown below. Figure 3 As shown, the angle represented by θ is the taper of the internal cavity wall of the assembly composed of the combined wall panels 101.

[0030] like Figure 4As shown, each composite wall panel 101 is equipped with an independent drive cylinder 3, which includes a swing cylinder 301 and a deflection cylinder 302. The fixed end of the swing cylinder 301 is rotatably connected to the lower outer side of the tank body 1, and the drive end is movably connected to the outer wall surface of the composite wall panel 101. The connection is a ball cage universal joint to cooperate with the deflection movement of the composite wall panel 101 relative to the wall panel connecting seat 103. When the drive end extends, it can drive the composite wall panel 101 to swing inward to the tank body 1. When the drive end retracts, it can drive the composite wall panel 101 to swing outward to the tank body 1. The fixed end of the deflection cylinder 302 is rotatably connected to the outer wall surface of the combined wall plate 101 away from the inclined wall surface 1011. The driving end of the deflection cylinder 302 is rotatably connected to the driving end of the swing cylinder 301. The deflection cylinder 302 and the swing cylinder 301 are in an orthogonal position relationship. When the driving end of the deflection cylinder 302 extends, it can drive the end of the combined wall plate 101 with the inclined wall surface 1011 to deflect towards the outside of the tank 1. When the deflection cylinder 302 retracts, it can drive the end of the combined wall plate 101 with the inclined wall surface 1011 to deflect towards the inside of the tank 1.

[0031] like Figure 2 and Figure 3 As shown, the combined wall panels 101 are fitted with an outer shell 4, which is an inverted conical hollow cavity that completely encloses the circumferentially arranged combined wall panels 101. Five downwardly extending support legs 401 are provided on the outer wall of the outer shell 4.

[0032] Separation and impurity removal principle: such as Figure 6 As shown by the thick spiral line, the waste pulp generated during papermaking is tangentially introduced through the inlet 102, flows along the inner wall of the tank 1, and spirals downwards under the influence of gravity into the inverted conical assembly formed by the combined wall panels 101. As the liquid flows downwards in a spiral, the width of the opening in the inner cavity of the inverted conical structure gradually narrows with decreasing height, and the spiral rotation speed of the liquid gradually increases. At the center, influenced by the vacuum negative pressure, an upward liquid flow begins to form, rotating in the opposite direction to the outer liquid flow. Impurities in the waste pulp are deflected during the downward spiral rotation. The centrifugal force moves the liquid flow towards the inner wall of the combined wall plate 101. The liquid flow with less impurities moves towards the middle of the inverted conical assembly. At the bottom, most of the solid impurities are discharged directly from the bottom of the inverted conical assembly. The liquid flow with less impurities moves upward in a spiral motion during the reverse rotation. During the ascent, the impurities gradually slow down their upward speed under the influence of their own gravity and move outward under a similar centrifugal force, thus forming slag and slurry separation again. The slurry outlet pipe 2, which is set at the axis of the tank body 1, can extract the treated slurry with low impurity content from the upper part.

[0033] The principle of separating impurities through deformation of the assembly: such as Figure 7As shown, the taper θ of the combined wall panel 101 assembly shown in the three vertical figures on the left is smaller than that shown in the three vertical figures on the right, and the lower opening of the combined wall panel 101 assembly is larger. The smaller taper θ can achieve a higher degree of separation of impurities in the waste slurry and can separate and obtain a treatment liquid with lower impurity content. However, the larger taper θ can achieve a higher separation efficiency, that is, the speed of separating impurities is faster. When the impurity particle size in the waste slurry is large, the assembly with a smaller taper θ has a higher separation efficiency.

[0034] The deformation principle of the combined wall plate 101: The driving end of the swing cylinder 301 on the left side of the combined wall plate 101 extends outward, and the combined wall plate 101 swings towards the inside of the tank 1 along with the wall plate connecting seat 103. At the same time, the driving end of the deflection cylinder 302 retracts inward, and the side of the combined wall plate 101 with the inclined wall surface 1011 swings towards the inside of the tank 1. The above two swing deflection actions work in sync to make the inner wall taper θ of the combined wall plate 101 change from small to large. Conversely, the driving cylinder 3 moves in the opposite direction to make the inner wall taper θ of the combined wall plate 101 change from large to small.

[0035] Specific Implementation Example 1: Please refer to the appendix Figure 7

[0036] Based on the first specific embodiment, a spirally extending guide vane 201 is made on the outer side of the slurry outlet pipe 2. The rotation direction of the guide vane 201 is consistent with the liquid flow cutting direction at the slurry inlet 102. After the waste slurry is introduced through the slurry inlet 102, it can form a downward spiral rotation more quickly under the guidance of the guide vane 201, and generate centrifugal effect more quickly to achieve the separation of slag and slurry in the waste slurry.

[0037] The above description is only a preferred embodiment of the present utility model and is intended to illustrate the principle and effect of the present utility model, and is not intended to limit the present utility model. All variations, modifications and substitutions within the spirit and principle of the present design are within the protection scope of the present utility model.

Claims

1. A paper product production waste slurry treatment and recovery apparatus characterized by: It includes a tank body (1) and a slurry outlet pipe (2). The slurry outlet pipe (2) is fixedly installed at the center of the upper part of the tank body (1). The pipe opening is vertically inserted into the tank body (1) and extends to the middle of the tank body (1). A combination wall plate (101) is movably connected to the lower side of the tank body (1). Several combination wall plates (101) are arranged circumferentially around the central axis of the tank body (1) and are jointly enclosed to form the inner cavity wall of the tank body (1) in the form of adjacent combination wall plates (101) being inclinedly stacked.

2. A paper product manufacturing waste slurry treatment and recovery apparatus according to claim 1, characterized in that: A slurry inlet (102) is provided on the upper side wall of the tank (1), and the opening direction of the slurry inlet (102) is horizontally tangent to the contour of the inner wall of the tank (1).

3. A paper product manufacturing waste slurry processing and recovery apparatus according to claim 1, characterized in that: The tank body (1) is rotatably connected to several wall plate connecting seats (103). The wall plate connecting seats (103) have the ability to swing closer to or away from the center of the tank body (1). Each wall plate connecting seat (103) is rotatably connected to a combined wall plate (101) which swings synchronously with it.

4. A paper product manufacturing waste slurry treatment and recovery apparatus according to claim 3, characterized in that: The combined wall panel (101) has an inclined wall surface (1011) on one side. When the combined wall panels (101) are stacked together, the inclined wall surface (1011) of any combined wall panel (101) overlaps and adheres to the side of the adjacent combined wall panel (101) that does not have an inclined wall surface (1011). All the combined wall panels (101) together form an inverted cone-shaped combination that is larger at the top and smaller at the bottom, which serves as the lower extension structure of the tank body (1).

5. The waste pulp treatment and recycling equipment for paper product manufacturing according to claim 4, characterized in that: It also includes several sets of driving cylinders (3), each set of driving cylinders (3) is connected to a combined wall plate (101), and each set of driving cylinders (3) includes a swing cylinder (301) and a deflection cylinder (302); the fixed end of the swing cylinder (301) is rotatably connected to the outside of the tank body (1), and the driving end is movably connected to the outer wall surface of the combined wall plate (101). When the driving end extends, it can drive the combined wall plate (101) to swing inward to the tank body (1), and when the driving end retracts, it can drive the combined wall plate (101) to move towards the tank body (1). The deflection cylinder (302) is rotatably connected to the outer wall of the combined wall plate (101). The driving end of the deflection cylinder (302) is rotatably connected to the driving end of the swing cylinder (301). When the driving end of the deflection cylinder (302) extends, it can drive the end of the combined wall plate (101) with the inclined wall surface (1011) to deflect towards the outside of the tank (1). When the deflection cylinder (302) retracts, it can drive the end of the combined wall plate (101) with the inclined wall surface (1011) to deflect towards the inside of the tank (1).

6. The waste pulp treatment and recycling equipment for paper product manufacturing according to claim 1, characterized in that: It also includes an outer shell (4), which has a hollow cavity inside and several support legs (401) extending from the outer wall of the outer shell (4); the outer shell (4) is fixedly connected to the tank (1) and is fitted on the outside of the tank (1), enclosing the circumferentially arranged combination wall pieces (101) as a whole.

7. The waste pulp treatment and recycling equipment for paper product manufacturing according to claim 1, characterized in that: The outer wall of the slurry outlet pipe (2) is provided with spirally extended guide vanes (201), and the direction of rotation of the guide vanes (201) is consistent with the direction of liquid flow ingress at the slurry inlet.

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