A double-disc pulper

Abstract

This invention relates to the field of grinding mills and fine grinding mills, and discloses a dual-disc grinding mill. Both the first and second grinding discs are equipped with identical grinding texture components. The first grinding disc includes a disc body, and the grinding texture component includes multiple sets of grinding textures of different lengths arranged in a circular array on the disc body. The length direction of the grinding textures is not collinear with the radial direction of the disc body. Multiple damping columns are arranged along the length direction of the grinding textures. The spacing of the damping columns on any of the grinding textures decreases linearly or non-linearly along the direction away from the axis of the disc body. This invention uses damping columns instead of traditional concave bags. When the density of the damping columns is high, it can extend the grinding time of the slurry and increase the internal energy received by the slurry during the grinding process, achieving the effect of increasing temperature for inactivation and sterilization.

Description

Technical Field

[0001] This invention relates to the field of grinding mills and fine grinding mills, and more particularly to a double-disc grinding mill. Background Technology

[0002] When disc mills were first invented, they were mainly used for regrinding coarse wood pulp; the equipment was simple but lacked precision. In recent years, due to extensive research into the mechanical structure and tooth patterns of disc mills, their applications have become increasingly widespread. Especially in recent years, development both domestically and internationally has been very rapid. Currently, the pulp processed by disc mills in China has expanded to include all kinds of plant fiber pulps except hemp pulp, producing dozens of varieties of industrial paper, cultural paper, paperboard, double-sided laminated sheets, toilet paper, opaque paper, waterproof paper, typing paper, etc. Furthermore, the heated tobacco products currently being researched and put into production in the cigarette industry also utilize bamboo powder ground by disc mills as a cigarette material.

[0003] Existing disc mills typically use a ring-shaped array of serrated grinding grooves in the axial direction to grind the slurry material. Under the immense centrifugal force of the high-speed rotating disc, the slurry is pumped out from the center of the disc to the surrounding areas. To prolong the time the slurry spends within the disc and achieve uniform processing, a sealing ring is placed on the grinding surface or a dam is placed in the grooves between the grinding grooves. This forms concave bags to prevent the slurry from being pumped out rapidly. While these concave bags do block the slurry from being pumped out to some extent, the slurry easily gets stuck inside the concave bags, preventing it from moving on the grinding surface for thorough grinding. When the concave bags are full, the grinding grooves become ineffective, causing subsequent slurry to be quickly thrown out of the disc without being ground or with poor grinding quality. Furthermore, the concave bags restrict the movement of the slurry between the first and second grinding discs, preventing it from moving and grinding sufficiently between the discs. Therefore, a disc mill that can limit the rapid pumping out of the slurry and prevent the slurry from clogging the concave bags, thus avoiding poor grinding accuracy and effect in subsequent slurry grinding, is needed. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a dual-disc refiner to solve the problem of poor pulp grinding caused by the concave bag in existing disc refiners.

[0005] The present invention solves the above-mentioned technical problems through the following technical means:

[0006] A dual-disc refiner includes a hinged first and second grinding discs. Both the first and second grinding discs are equipped with identical grinding groove components. The first grinding disc includes a disc body, and the grinding groove component includes multiple sets of grinding grooves of different lengths arranged in a circular array on the disc body. The length direction of the grinding grooves is not collinear with the radial direction of the disc body. Multiple damping pillars are arranged along the length direction of each grinding groove. The spacing of the damping pillars on any grinding groove decreases linearly or non-linearly along the direction away from the disc body axis. This application eliminates the traditional baffles or sealing rings arranged between the grinding grooves. It uses raised damping pillars arranged on the grinding grooves to partially restrict the movement of the slurry moving outward along the grooves between the grinding grooves under the drive of centrifugal force and pump driving force. Furthermore, the grooves between the grinding grooves do not obstruct the slurry due to lateral blockage. This achieves the goal of limiting the rapid pumping out of the slurry while preventing the slurry from moving too little between the grinding discs, thus avoiding poor subsequent grinding accuracy and effect.

[0007] Furthermore, the grinding grooves include a first grinding groove, a second grinding groove, and a third grinding groove with sequentially decreasing lengths. The ends of the first grinding groove, the second grinding groove, and the third grinding groove that are away from the first grinding disc are concentric circles, and the number of the first grinding groove, the second grinding groove, and the third grinding groove is consistent and / or increases progressively. This application provides multiple sets of grinding grooves of different lengths, which can guide the slurry pumped into the refiner step by step along the grooves between adjacent grinding grooves to the third grinding groove under the action of centrifugal force. This results in high transfer efficiency and, to a certain extent, can ablate the slurry to facilitate grinding.

[0008] Furthermore, the damping pillars include a first damping pillar disposed on the first grinding groove, a second damping pillar disposed on the second grinding groove, and a third damping pillar disposed on the third grinding groove, with the diameters of the first, second, and third damping pillars decreasing sequentially. This application aims to maximize the number of third grinding grooves used for performing the main work and enhance the function of preventing rapid pumping of the slurry. By reducing the size of the damping pillars, the arrangement density of the third grinding grooves is increased. The slurry, when moving along the grooves, is restricted by the damping pillars, resulting in higher disorder and grinding efficiency.

[0009] Furthermore, the first grinding disc also includes a central disc, with the disc body sleeved around the periphery of the central disc. Multiple pump inlets are perforated on the central disc, and a pump inlet disc, connected to the central disc's rotating shaft, is positioned corresponding to each pump inlet. The pump inlet disc has a connecting hole matching the pump inlet. A drive bar, an arc-shaped drive bar, is positioned on the other side of the pump inlet disc opposite to the central disc, arranged in a circular array on the pump inlet disc. This application uses the pump inlet on the central disc as the slurry pumping position and includes a rotatable pump inlet disc relative to the central disc. When the pump inlet disc rotates, it intermittently connects the pump inlet and the connecting hole. By controlling the rotation speed of the pump inlet disc, the slurry pumping speed can be controlled. Furthermore, the slurry entering through the connecting hole is guided by the arc-shaped drive disc into the disc body for grinding, resulting in high transfer efficiency.

[0010] Furthermore, the height of the grinding grooves along the axial direction of the disc increases linearly or non-linearly from the end near the pumping disc to the end away from the pumping disc. This application employs a stepped grinding groove design, which, when the first and second grinding discs are engaged, allows for a reserved space for slurry pumping in at the middle of the grinding discs. Furthermore, it allows slurry with smaller particle sizes to enter the third grinding groove area for grinding and pumping out, while slurry with larger particles needs to be crushed near the middle of the first and second grinding discs to reduce the particle diameter before entering the third grinding groove area for grinding.

[0011] Furthermore, one side of the grinding groove is connected to the disc body, and the grinding groove has grinding teeth on the other side of the disc body. Referring to the prior art, the grinding groove needs to be designed to be shallow and dense. After the groove completes the slurry guidance, the slurry needs to be ground by the grinding teeth on the grinding groove. Preferably, the grinding teeth are conical teeth.

[0012] Furthermore, the second grinding disc has a groove corresponding to the pumping disc. This application provides a groove to accommodate the pumping disc, reserving installation space for its installation and rotation.

[0013] The beneficial effects of this invention are:

[0014] This application eliminates the traditional baffles or sealing rings arranged between the grinding grooves. Instead, it uses raised damping columns arranged on the grinding grooves to partially restrict the movement of the slurry moving outward along the grooves between the grinding grooves under the drive of centrifugal force and pump force. Furthermore, there is no lateral obstruction within the grooves between the grinding grooves that would cause slurry adsorption. This achieves the goal of limiting rapid slurry pumping and preventing slurry blockage that could lead to poor subsequent grinding accuracy and effect. Further, by increasing the density of the damping columns in the direction away from the disc axis, more damping columns are placed in the densely packed grinding groove area, which is mainly used for grinding. When the slurry moves along the grooves between the grinding grooves in the direction away from the disc center, the moving speed gradually decreases as the number of damping columns in the grooves increases. This allows the slurry to remain in the densely packed grinding groove area with a higher damping column density for a longer period, thus fully completing the grinding process. To a certain extent, by controlling the density of the damping columns in the densely packed grinding groove area, the grinding time of the slurry in this area can be controlled. When the density of damping columns is high, it can prolong the grinding time of the slurry and increase the internal energy received by the slurry during the receiving and grinding process, thereby achieving the effect of raising the temperature to inactivate and sterilize. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the double-disc refiner of the present invention;

[0016] Figure 2 This is a schematic diagram of the first grinding disc of the present invention;

[0017] Figure 3 This is a schematic diagram of the first grinding disc assembly of the present invention;

[0018] in,

[0019] 100. First grinding disc; 110. Grinding groove; 111. First grinding groove; 112. Second grinding groove; 113. Third grinding groove; 120. Damping column; 121. First damping column; 122. Second damping column; 123. Third damping column; 130. Pump inlet; 140. Disc body; 150. Pump inlet disc; 151. Connecting hole; 152. Drive bar; 160. Center disc; 200. Second grinding disc. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figure 1-2As shown, a dual-disc refiner of the present invention includes a first grinding disc 100 and a second grinding disc 200 hinged together. The first grinding disc 100 and the second grinding disc 200 have similar structures. Both the first grinding disc 100 and the second grinding disc 200 are provided with grinding texture components of the same structure. Taking the first grinding disc 100 as an example, the first grinding disc 100 includes a disc body 140. The grinding texture component includes multiple sets of grinding textures 110 of different lengths arranged in a ring array on the surface of the disc body 140. The length direction of the grinding textures 110 is not collinear with the radial direction of the disc body 140. The grinding textures 110 are used to grind the slurry between the first grinding disc 100 and the second grinding disc 200 when they rotate in opposite directions with the grinding textures on the second grinding disc 200. For details, please refer to existing dual-disc refiners, which will not be described in detail in this application. Multiple damping columns 120 are provided along the length direction of the grinding textures 110. The damping pillars on any grinding groove 110 are arranged such that the spacing between them decreases linearly or non-linearly along the direction away from the center of the grinding groove 140. That is, within a unit length, the further away from the axis of the disc 140 on the grinding groove 110, the greater the number of damping pillars 120. Thus, the further away from the axis of the disc 140 on the grinding groove 110, the higher the density of the damping pillars 120. One side of the grinding groove 110 is connected to the disc 140, and the other side of the grinding groove 110 relative to the disc 140 has grinding teeth. The grinding teeth are used to grind and crush the slurry when the first grinding disc 100 and the second grinding disc 200 are working together. This application eliminates the traditional baffles or sealing rings arranged between the grinding grooves 110. Instead, it uses raised damping columns 120 arranged on the grinding grooves 110 to partially restrict the movement of the slurry moving outward along the grooves between the grinding grooves 110 under the drive of centrifugal force and pump driving force. Furthermore, there is no lateral obstruction in the grooves between the grinding grooves 110 that would cause slurry adsorption. This achieves the goal of limiting the rapid pumping out of the slurry and preventing slurry blockage that could lead to poor subsequent grinding accuracy and grinding effect. Furthermore, increasing the density of the damping columns 120 in the direction away from the axis of the disc 140 allows for more damping columns 120 to be placed in the dense area of ​​the grinding grooves 110, which is mainly used for grinding, away from the axis of the disc 140. When the slurry moves along the grooves between the grinding grooves in the direction away from the center of the disc 140, the moving speed gradually decreases as the number of damping columns 120 in the grooves increases. This allows the slurry to remain in the dense area of ​​the grinding grooves 110 and the area with a high density of damping columns 120 for a longer period of time, thus fully completing the grinding. To a certain extent, by controlling the density of the damping columns 120 in the dense area of ​​the grinding grooves 110, the grinding time of the slurry in the dense area of ​​the grinding grooves 110 can be controlled. When the density of the damping columns 120 is high, the grinding time of the slurry can be extended and the internal energy received by the slurry during the grinding process can be increased, achieving the effect of raising the temperature for inactivation and sterilization.

[0022] The grinding pattern 110 includes a first grinding pattern 111, a second grinding pattern 112, and a third grinding pattern 113, whose lengths decrease sequentially. The ends of the first grinding patterns 111, the second grinding patterns 112, and the third grinding patterns 113, which are furthest from the axis of the disk body 140, are on the same circumference. During setup, the first grinding patterns 111 are first arranged in a circular array, then the second grinding patterns 112 are arranged in a circular array between two adjacent first grinding patterns 111, and finally the third grinding patterns 113 are arranged in a circular array between the first grinding patterns 111 and the second grinding patterns 112. In this application, the grinding pattern 110 is arranged in an equally spaced circular array; however, in actual use, it can also be arranged in a circular array at a specified distance, which will not be described in detail here. The number of the first grinding patterns 111, the second grinding patterns 112, and the third grinding patterns 113 remains equal or decreases sequentially; that is, the number of first grinding patterns 111 is less than or equal to the number of second grinding patterns 112, which is less than or equal to the number of third grinding patterns 113. In this application, the number of the first grinding groove 111 and the second grinding groove 112 are set to be the same, and the number of the second grinding groove 112 is less than the number of the third grinding groove 113. Preferably, the number of the third grinding groove 113 can be four times the number of the second grinding groove 112. This application increases the arrangement density of the grinding groove 110 at the location of the third grinding groove 113, which is mainly used for grinding, by increasing the number of the third grinding groove 113, thereby achieving the purpose of fully grinding the slurry.

[0023] The damping column 120 includes a first damping column 121 disposed on the first grinding groove 111, a second damping column 122 disposed on the second grinding groove 112, and a third damping column 123 disposed on the third grinding groove 113. The diameters of the first damping column 121, the second damping column 122, and the third damping column 123 decrease sequentially. In this application, to prevent the damping columns 120 in the densely arranged areas of the grinding groove 110 from completely blocking the grooves between the grinding grooves 110, thereby restricting the movement of the slurry or blocking the slurry channel, the diameter of the third damping column 123 on the third grinding groove 113 is set to the minimum to ensure that the grooves in the densely arranged areas of the grinding groove 110 are not blocked. The second damping column 122 and the third damping column 123 can, to some extent, delay the entry of the slurry into the area of ​​the third grinding groove 113, thereby increasing the overall grinding time of the slurry.

[0024] The first grinding disc 100 also includes a central disc 160. For example... Figure 3A disc body 140 is fitted around a central disc 160, and multiple pump inlets 130 are provided through the central disc 160. The pump inlets 130 are used to connect to the slurry input pipe to supply slurry to the central position of the dual-disc refiner. A pump inlet disc 150 is provided on the central disc 160 corresponding to the pump inlets 130. The pump inlet disc 150 is connected to the rotating shaft of the central disc 160, and one side of the pump inlet disc 150 is in contact with the central disc 160. The axial direction of the pump inlet disc 150 is collinear with the axial direction of the disc body 140. The pump inlet disc 150 is provided with a connecting hole 151 matching the pump inlets 130. The pump inlet disc 150 can rotate relative to the central disc 160 under the drive of a motor, thereby intermittently connecting the connecting hole 151 and the pump inlets 130, ensuring that the slurry in the grinding groove 110 has more grinding cycles through periodic slurry supply. A plurality of annular array drive bars 152 are provided on the other side of the pump inlet disc 150 relative to the center disc 160. The drive bars 152 are arc-shaped drive bars. The drive bars 152 are used to disperse the slurry that enters the first grinding disc 100 from the pump inlet 130 through the connecting hole 151 to the grinding grooves 110 on the disc body 140.

[0025] The height of the grinding groove 110 along the axial direction of the disc 140 increases linearly or non-linearly from the end near the pump inlet disc 150 to the end away from the pump inlet disc 150. To ensure that the slurry entering from the pump inlet 130 can smoothly reach and be held on the grinding teeth of the grinding groove 110, the height of the grinding groove 110 is set to gradually increase or remain constant away from the axis. Specifically, the grinding groove height is highest at the third grinding groove 113 position, and lowest at the first grinding groove 111 near the pump inlet 130. It is worth noting that this application is primarily used in vertical double-disc refiners to prevent slurry from flowing directly out of the grinding disc along the grooves without being ground by the grinding teeth.

[0026] The structure of the second grinding disc 200 is basically the same as that of the first grinding disc 100. The difference is that the second grinding disc 200 is recessed at the position corresponding to the pump inlet disc 150 to accommodate the pump inlet disc 150. The rotation direction of the second grinding disc 200 is opposite to that of the first grinding disc 100 to provide higher torque to the slurry. The driving method of the first grinding disc 100 and the second grinding disc 200, as well as the collection of the slurry after grinding, can refer to existing dual-disc refiners, and will not be described in detail in this application.

[0027] The damping pillars 120 on the same grinding groove 110 can be arranged such that the radius decreases sequentially from the end closer to the shaft center to the end farther from the shaft center, thereby increasing the number of damping pillars that can be arranged at the end of the grinding groove 110 away from the shaft center.

[0028] The double-disc refiner also includes other components such as the central disc connecting carrier, the pulp output pipe, the drive motor, etc. The relevant contents are already described in detail in the existing technology, so they will not be elaborated on here.

[0029] In use, the slurry first enters the interior of the first grinding disc 100 and the second grinding disc 200 through the connected pump inlet 130 and connecting hole 151, and then enters the disc body 140 under the actuation of the drive bar 152. When the slurry enters the disc body 140, it sequentially enters the third grinding groove 113 along the first grinding groove 111 and the second grinding groove 112. During the movement, the aforementioned grinding grooves 110 perform graded grinding of the slurry, resulting in higher grinding efficiency. Moreover, as the slurry moves along the grooves, the damping pillars 120 on the grinding grooves 110 obstruct the movement of the slurry, preventing it from flowing out of the grooves between the grinding grooves 110 quickly. Furthermore, the damping pillars 120, while obstructing the slurry, also increase the disorder of the slurry's movement, allowing the slurry to move sufficiently to the grinding teeth position on the grinding grooves 110. Increasing the density of the damping columns 120 can also increase the grinding time of the slurry in the first grinding disc 100 and the second grinding disc 200, thereby increasing the internal energy received by the slurry during the receiving and grinding process, achieving the effect of raising the temperature to inactivate and sterilize.

[0030] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention. Technical aspects, shapes, and structures not described in detail in this invention are all well-known technologies.

Claims

1. A twin-disc refiner comprising a first refining disc (100) and a second refining disc (200) hinged together, characterized in that, Both the first grinding disc (100) and the second grinding disc (200) are provided with grinding pattern components with the same structure. The first grinding disc (100) includes a disc body (140). The grinding pattern component includes multiple sets of grinding patterns (110) of different lengths arranged in a ring array on the disc body (140). The length direction of the grinding pattern (110) is not collinear with the radial direction of the disc body (140). Multiple damping columns (120) are provided along the length direction of the grinding pattern (110). The spacing of the damping columns (120) on any grinding pattern (110) decreases linearly or nonlinearly along the direction away from the axis of the disc body (140) of the grinding pattern (110). The grinding marks (110) include a first grinding mark (111), a second grinding mark (112), and a third grinding mark (113) with successively decreasing lengths. The first grinding mark (111), the second grinding mark (112), and the third grinding mark (113) are circular at one end away from the first grinding disc (100). The number of the first grinding mark (111), the second grinding mark (112), and the third grinding mark (113) is consistent and / or increases progressively. The damping column (120) includes a first damping column (121) disposed on the first grinding groove (111), a second damping column (122) disposed on the second grinding groove (112), and a third damping column (123) disposed on the third grinding groove (113), wherein the diameters of the first damping column (121), the second damping column (122), and the third damping column (123) decrease sequentially.

2. The double-disc refiner according to claim 1, characterized in that, The first grinding disc (100) also includes a central disc (160), the disc body (140) is sleeved on the periphery of the central disc (160), a plurality of pump inlets (130) are provided through the central disc (160), a pump inlet disc (150) is provided on the central disc (160) corresponding to the position of the pump inlets (130) and connected to the rotating shaft of the central disc (160), a connecting hole (151) matching the pump inlets (130) is provided on the pump inlet disc (150), a drive bar (152) is provided on the other side of the pump inlet disc (150) opposite to the central disc (160), the drive bar (152) is an arc-shaped drive bar, and the drive bar (152) is arranged in a ring array on the pump inlet disc (150).

3. Double-disc pulp refiner according to claim 2, characterized in that The height of the wear pattern (110) along the axial direction of the disc (140) increases linearly or non-linearly from the end near the pumping disc (150) to the end away from the pumping disc (150).

4. Double-disc pulp refiner according to claim 3, characterized in that The grinding groove (110) is connected to the disc body (140) on one side, and the grinding groove (110) has grinding teeth on the other side of the disc body (140).

5. The twin-disc pulp refiner of claim 2, wherein, The second grinding disc (200) has a groove at the location corresponding to the pumping disc (150).

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