Rotor for fiber material preparation apparatus

Abstract

The utility model relates to a rotor (21) used for fiber material preparation equipment (1), the rotor (21) is provided with a rotor shaft (25) and at least one rotor blade (23) radially extending from the rotor shaft (25), the rotor blade (23) is used for moving fiber material suspension liquid, the rotor (21) is used for rotating and driving in a preferential direction (33), the rotor (21) has rotor blades (23) which have an incident flow surface (31) for accelerating the orientation of the fibrous suspension in a preferred direction, and wherein the rotor (21) is at least partially provided with a functional surface (41) on at least one surface (35) facing away from the preferred direction, the functional surface is a roughened surface and the incident flow surface has a lower roughness than the functional surface.

Description

Technical Field

[0001] The utility model relates to various rotors used for material preparation or pulp preparation. Background Art

[0002] Rotors are used, for example, in pulping machines. The pulping machine is filled with hot return water and the rotor in the pulping machine sets the water in rotation. Paper is added in bales or in bulk. The paper is moistened with water. The rotor generates a flow, which draws the paper into the area of ​​the rotor. The introduced paper is roughly comminuted by the rotor. From a certain size of paper pieces, the efficiency of the rotor decreases. Further decomposition now takes place by impact action in the area of ​​the screen plate opening. The efficiency decreases as the paper pieces become smaller. Further decomposition then takes place only in the moving material by material friction. This decomposition caused by material friction is usually very inefficient, time-consuming or associated with a relatively high energy demand. Usually during decomposition, depending on the raw material and the state of the decomposition elements, rotors, screen plates, there are still 1x1 mm particles in the acceptable pulp, also called qualified material. 2 Up to 5x5mm 2 The acceptable pulp is further broken down and shredded in the subsequent secondary pulper. Most of the lumps and paper lumps are broken down. However, the remaining lumps and lumps are discharged as waste in the subsequent sorting and appear as fiber loss.

[0003] Furthermore, the remaining long fibers in the suspension often appear together with entanglements. This means that a fiber cloud is formed which is connected by the long fibers. Foreign matter may also be contained in the fiber cloud, which makes it difficult to separate the foreign matter from the fiber suspension.

[0004] A pulping machine with fixedly arranged wings is known from document US Pat. No. 3,163,368. The wings are arranged radially coaxially with the rotor and have a ribbed surface on both sides.

[0005] A pulp disintegrator with a stationary impact element near the rotor is known from document DE 26919247 U1. The rotor comprises at least one spiral body. The spiral body has an adjustment section A and a section B not belonging to the adjustment section. The adjustment section A is arranged at an angle to the section B. Utility Model Content

[0006] The technical problem to be solved by the present invention is to improve the quality of the fiber suspension produced in the corresponding process steps. In particular, the technical problem to be solved by the present invention is to produce a more uniform fiber suspension and increase the proportion of free, individual fibers.

[0007] The technical problem is solved by a rotor for a fiber material preparation device, wherein the rotor has a rotor shaft and at least one rotor blade extending radially from the rotor shaft for moving a fiber material suspension, and the rotor is configured for rotational drive in a preferred direction, wherein the rotor blade has an incident flow surface for accelerating the fiber suspension in the preferred direction, and the rotor is at least partially provided with a functional surface on at least one surface facing away from the preferred direction, wherein the functional surface is a rough surface and the incident flow surface has a lower roughness than the functional surface.

[0008] By means of the rotor according to the invention having a functional surface, an improved fiber suspension can be achieved in a fiber material production plant.

[0009] By arranging the rotor according to the invention in the fiber material production device, the efficiency of the fiber material production device can also be subsequently increased. A functional surface is understood to be a surface with a rough surface. Preferably, the functional surface has a total height R of the roughness profile in the range of 0.15 mm to 5 mm. t For example, the total height of the roughness profile can be detected using a surface measuring device Partometers S3P. A measuring distance of 10 times the value of the total height of the roughness profile has proven to be suitable. When the total height of the roughness profile exceeds 4 mm, the total height of the roughness profile can preferably be determined by embossing.

[0010] Due to the locally generated eddies, the lumps and / or paper pieces slide along the functional surface. The lumps or paper pieces are subjected to friction and / or shear forces and break down into individual fibers. The functional surface is arranged on the surface facing away from the preferred direction. This allows gentle treatment of the components through which the flow passes. High energy input is avoided and the wear of the functional surface is kept to a minimum. The basic feature is that the functional surface is located on the side facing away from the flow and is therefore exposed to less wear. In order to also keep the energy requirement low, no functional surface is arranged precisely on the flow surface. The flow surface has a lower roughness than the functional surface.

[0011] In a preferred embodiment, it is provided that the functional surface is a structured surface having a structure, in particular a regular structure, of at least 0.15 mm, preferably 1.5 mm high, the height being measured perpendicularly to the surface normal of the surface opened by the minimum point. This surface structure can be measured by an electron microscope. This height difference has been shown to be beneficial for interacting with paper pieces flowing through. In particular, paper pieces or lumps can be captured in the structure and then gently broken down into single fibers by the shear forces generated by the suspension that continues to flow through the structure. Here, the suspension that flows through also causes the functional surface to be rinsed and prevents clogging of the surface structure. Therefore, the functional surface structure must be selected in such a way that clogging of the surface structure does not occur according to the suspension used in the processing. When a fiber mat is placed on a functional surface and the function is therefore no longer guaranteed, there is clogging of the surface.

[0012] In a further embodiment, it is provided that the functional surface is a rough surface, ie a surface with a non-periodic structure, extending from a height of 0.15 mm to 5 mm. This allows for a respectively suitable treatment of the fiber connections (paper lumps / lumps).

[0013] In one embodiment, it is provided that the functional surface is arranged on one of the rear sides relative to the preferred direction of the rotor blade. The functional surface is thus not loaded by the main flow of the suspension. This results in lower wear compared to positioning on the surface of the rotor facing the flow.

[0014] The rotor is provided for a flat screen machine, such as a pulping machine or a disc separator or a vertical separator. In a preferred application, it is provided that a rotor with a functional surface is used in a pulping machine. The efficiency of the pulping machine can be further improved thereby. Through the functional surface, the decomposition of lumps and plaques can be achieved through interaction with the functional surface. It has been proven to be advantageous to provide a functional surface on the surface of the rotor blade that is not directly facing the flow. In particular, it has been shown to be effective in the area where turbulence is formed during operation to provide a functional surface for gentle treatment of fiber composites. Here, different functional surfaces can be provided on different faces of the rotor blade that are away from the screen. Therefore, a functional surface provided on the side of the rotor blade that is away from the screen, which is approximately parallel to the screen, can have a different structure from a surface having a component extending perpendicular to the screen on the side of the rotor blade that is away from the preferred direction. By pressing in paper lumps and lumps, the lumps and lumps receive a load above their strength and are decomposed into single fibers. Multiple interactions with the functional surface may also be required to achieve decomposition and loosening of the fiber composite.

[0015] In one embodiment, it is provided that functional surfaces are arranged on the rotor shaft between the rotor blades in the circumferential direction. These functional surfaces can be additional or can also be provided as the only functional surface.

[0016] It has proven to be particularly advantageous if the functional surface is arranged on the rotor shaft adjacent to the side of the rotor facing away from the preferred direction and extends only over a partial region in the circumferential direction. The functional surface is formed on the back side of the rotor blade facing away from the preferred direction. This allows the functional surface in the surface region to be varied depending on the application. This results in an effect suitable for improving the fiber suspension.

[0017] It has proven to be advantageous if the functional surface is also provided on the propeller head of the stirring mechanism.

[0018] The functional surface on the stirring mechanism leads to a gentle fibrillation or fluttering (German: Fibrillierung) of the fibers. This increases the strength of the paper without damaging the fibers. The keratinized fiber surface is reactivated. The functional surface is so fine that neither spinning nor sticking pulverization (German: Stickizerkleinerung) occurs. However, there is a high flow intensity, so that the functional surface is always self-cleaning and no deposits are formed.

[0019] In general, and independently of the specific machine, the functional surface contributes to the cleaning of the paper fibers. Just as the fibers can be colored, even the smallest dirt particles can attach to the free OH groups. The paper strength decreases because the OH groups of the fibers are already occupied by dirt. The fibers are treated and cleaned by the functional surface, just like on a washboard. This results in reinforced OH groups, which contribute to the strength of the paper. This allows the addition of additives to be reduced.

[0020] In one embodiment, in particular in a rotor for a pressure screening device, it is provided that at least one functional surface is arranged on one of the rotor blades, preferably on all rotor blades, in the outflow or discharge area, wherein the functional surface can vary in extent. The functional surface comprises a surface area proportion of at most 50% of the respective surface. Preferably, turbulence is generated in such a discharge area, which facilitates the interaction with the functional surface.

[0021] It has proven to be advantageous if the rotor blade is designed radially on the outside with a flow surface extending in the circumferential direction and the functional surface is formed as a surface region. The functional surface is formed at the end of the flow surface facing away from the preferred direction and has an axial extension. Advantages are also obtained if the rotor blade is designed radially on the inside with a flow surface extending in the circumferential direction and the functional surface is designed as a surface region. The functional surface region can also be provided inside and outside.

[0022] As a preferred application, the rotor has proven to be used in screening devices for removing fiber mats that form on the screen.

[0023] The method according to the invention for operating a rotor according to one of the preceding claims is characterized in that the fibers of the fiber suspension are accelerated by the rotational movement of the rotor, wherein the fibers first interact with the surfaces of the rotor blades facing the preferential direction and are accelerated, and then a part of the fiber suspension moving from the rotor in the area facing away from the preferential direction flows over at least one functional surface of the rotor and is additionally broken down or debonded or defibrillated (German: defibrilliert) by interaction with the functional surface. This additional treatment is a particularly gentle process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Further advantageous features of the invention are explained based on exemplary embodiments with reference to the accompanying drawings.

[0025] Figure 1 A schematic diagram showing a fiber material processing device in the form of a screening device,

[0026] Figure 2 :Rotor for pulping machine

[0027] Figure 3 : Circulation propellers for pump units

[0028] Figure 4a : Schematic diagram of flat screen rotor

[0029] Figure 4b : Partial enlarged view of the flat screen rotor

[0030] Figures 5 to 16 : Different designs of functional surfaces. DETAILED DESCRIPTION

[0031] Figure 1, a screening device 9 of a fiber material preparation device 1 is shown. The design shown is a pressure separator. This screening device 9 has a suspension inlet 3, a material outlet 5 and a waste outlet 7. The screen 11 configured as a screen basket is arranged vertically. Alternatively, the screen not shown can also be arranged horizontally. The rotor 21 is arranged on the side of the screen basket facing the suspension inlet. Here, the rotor 21 is arranged radially inside the screen basket. The rotor 21 includes a drivable rotor shaft 25. The rotor blades 23 are firmly connected to the rotor shaft 25. These rotor blades 23 are arranged radially away from the rotor shaft 25. Through these rotor blades 23, the fibers and impurities located on the screen 11 are removed from the screen 11. For this purpose, the rotor blades 23 are vertically spaced radially from the screen 11 and rotate in front of the screen during operation. Here, the rotor blades 23 have an inflow area 31 pointing to the direction of rotation and a drainage area 39 at the end 29 of the rotor blade 23 relative to the circumferential direction 33. The drainage area 39 is provided with a functional surface 41. During operation, the fiber suspension is fed to the screening device 9. Due to the negative pressure on the material side, the suspension is accelerated in the direction of the screen 11. The suspension with fibers passes through the screen 11. The components of the suspension that are blocked by the screen 11 are removed from the screen by the rotor blades rotating through the screen. The material that has passed through the screen is discharged through the material outlet. Impurities are discharged downward from the screening device 9 and discharged through the waste outlet 7.

[0032] In the outflow region 39, the radial distance to the screen 11 increases and turbulence can be formed. As a result, the components of the suspension that are released from the screen 11 are gently treated by the functional surface 41 arranged in this region. The fiber composite can be broken up. The thickening in the screening device 9, also called a pressure separator, can be reduced by the breakdown of the fiber composite. The efficiency of the screening device 9 is increased. Due to the position of the functional surface 41, the wear of the functional surface 41 is very low and the associated energy requirement is also low. In such a screening device 9, fine functional surfaces have proven to be particularly suitable. Fine functional surfaces are those with a roughness profile total height R t The wear of the functional surface 41 requiring refurbishment can be expected at the same intervals as necessary rotor refurbishment.

[0033] Figure 22 shows a rotor 27 which is intended for a pulping machine. Such a rotor 27 is intended for mixing the ingredients in a pulping machine. The pulping machine is filled with hot return water. The rotor 27 in the pulping machine sets the water in rotation. Paper is introduced in bales or in bulk. The paper is moistened with water. The rotor 27 sucks the paper into the region of the rotor 27, where a rough comminution of the introduced paper takes place. From a certain size of paper lumps, the efficiency of the rotor 27 decreases. The further disintegration of the paper now takes place by impact on the screen opening of the pulping machine. But the efficiency also decreases as the paper lumps become smaller. The further disintegration now takes place only in the moving material by material friction. But this disintegration is very inefficient depending on the raw material. During the emptying process, depending on the raw material and the state of the disintegrating elements, paper lumps and agglomerates of sizes between 1x1 and 5x5 mm are still present in the accepted stock. The proportion of paper lumps is significantly reduced by the rotor 27 shown here.

[0034] The rotor blades 23 are connected to the rotor shaft 25. The rotor blades 23 have an incident surface 31 facing the direction of rotation. A functional surface 41 is provided on each of the rear sides of the blades 23. This surface is arranged facing away from the preferred direction 33. This means that the surface is arranged on the blades 23 of the rotor 21 opposite to the direction of rotation. This results in a better decomposition of paper lumps and agglomerates for all paper types.

[0035] By pressing lumps and paper lumps into the surface structure of the functional surface 41, 41', the lumps and paper lumps are loaded and broken down into single fibers. Paper lumps break down into lumps, and lumps break down into fibers. In this case, the fibers are separated from the fiber composite on many small impact surfaces of the functional surface 41. Even if the corners and edges of the functional surface are rounded, the shearing effect of the functional surface 41 is still maintained. The suspension flowing through the functional surface 41, 41' experiences shearing forces due to the flow paths of different lengths. Small pigment particles and coating lumps can also be crushed on the functional surface 41, 41'. Dirt spots are no longer visible visually or can only be seen very little. Due to the low flow intensity on the side away from the rotor blade 23, the plastic parts are not crushed by the functional surface and can be discharged as impurities. In the rotor provided for the pulping machine, a functional surface with a total height of a roughness profile in the range of 1 to 3 mm is particularly suitable.

[0036] exist Figure 32 shows a propeller 51 which can be used as a pump wheel as a rotor 21. Such a pump wheel can be used in a pump for pumping a fiber suspension. The rotor 21 is also called the propeller 51 and has a rotor shaft 25. The radially extending rotor blades 23 are connected to the rotor shaft 25. Functional surfaces 41, 41' are arranged between the rotor blades 23 in the circumferential direction and on the surfaces facing away from the rotor blades. Here, different functional surfaces 41 and 41' can be arranged on the surfaces facing away from the rotor blades and on the rotor shaft 25 between the blades. It is also possible to arrange the functional surface 41 only on the rotor blades 23 or to arrange the functional surface only on the shaft 41'.

[0037] The functional surface 41 is mounted on the propeller 51 of the agitator on the side of the propeller blade that performs conveyance.

[0038] The functional surfaces 41, 41' on the propellers cause gentle, minimal fibrillation of the fibers. This increases the strength of the paper without damaging the fibers. The keratinized fiber surfaces are reactivated. The functional surfaces 41, 41' are so fine that neither spinning nor sticking (German: Stickizerkleinerung) occurs. However, there is a high flow intensity, so that the functional surfaces 41, 41' are always self-cleaning and no deposits are formed.

[0039] A functional surface is any surface structure that forms a height / depth difference greater than 0.15 mm. The height-depth difference can be determined by a suitable measuring device based on the depth difference. The functional surface 41, 41' can be composed of grooves, trenches, holes and protrusions of any shape. Fig. 9 Different functional surfaces 41 , 41 ′ are shown.

[0040] A rotor for a flat screen is shown in Figure 4. The rotor is provided with a functional surface with a rib structure 61.

[0041] exist Figure 7 , Fig.10 , Fig.11 , Figures 13 to 16 A functional surface with a periodic structure is shown in FIG. Figure 5 A functional surface with a nearly periodic structure is shown. Figure 6 , Figure 8 , Fig. 9 and Fig.12 A non-periodic functional surface is shown in FIG. 1 . These examples show that the functional surface can have very different structures. The structure used depends largely on the intended application and the desired quality of the suspension.

[0042] Figure 8 A particularly fine functional surface is shown in . The surface has a non-periodic structure and a height-to-depth ratio of 0.15 mm.

[0043] Reference numerals list

[0044] 1 Fiber material preparation equipment

[0045] 3 Suspension inlet

[0046] 5 Material export

[0047] 7 Waste outlet

[0048] 9 Screening device

[0049] 11. Screen

[0050] 21 Rotor

[0051] 23 Rotor blades

[0052] 25 Rotor shaft

[0053] 27 Rotor for pulping machine

[0054] 29 End of rotor blade

[0055] 31. Streamside

[0056] 33 Preferred direction / direction of rotation

[0057] 34 Circumferential

[0058] 35 Divergence

[0059] 36 Radial

[0060] 37 dorsal side

[0061] 38 Axial

[0062] 39 Drainage area

[0063] 40 Flow surface

[0064] 41 Functional surface / functional surface area

[0065] 41' Functional Surface

[0066] 43 Structure of rules

[0067] 45 Aperiodic structures

[0068] 47 bulge

[0069] 51 Propeller

Claims

1. A rotor (21) for a fiber material preparation device (1), wherein: The rotor (21) has a rotor shaft (25) and at least one rotor blade (23) extending radially from the rotor shaft (25) for moving a fibrous stock suspension, and the rotor (21) is designed to be driven in rotation in a preferred direction (33), wherein the rotor blade (23) has a flow surface (31) directed in the preferred direction for accelerating the fibrous stock suspension, It is characterized in that The rotor (21) is at least partially provided with a functional surface (41) on at least one surface (35) facing away from the preferred direction, wherein the functional surface is a rough surface and the flow surface has a lower roughness than the functional surface.

2. A rotor (21) for a fiber material preparation device (1) according to claim 1, It is characterized in that The functional surface (41) is a regularly structured surface, the structure of which has a total roughness profile height Rt of at least 0.15 mm.

3. A rotor (21) for a fiber material preparation device (1) according to claim 1, It is characterized in that The functional surface (41) is a non-periodic structured surface having a total height Rt of a roughness profile of 0.15 mm to 5 mm.

4. The rotor (21) for a fiber material preparation device (1) according to claim 1, It is characterized in that The functional surface (41) is formed on a rear side (37) of the rotor blade (23) facing away from the preferential direction (33).

5. A rotor (21) for a fiber material preparation device (1) according to claim 4, It is characterized in that The rotor (23) is provided for a flat screen machine.

6. A rotor (21) for a fiber material preparation device (1) according to claim 5, It is characterized in that The rotor (23) is arranged for use in a pulping machine or a disc separator or a vertical separator.

7. The rotor (21) for a fiber material preparation device (1) according to claim 1, It is characterized in that The functional surface (41) is arranged on the rotor shaft (25) in the circumferential direction (34) between the rotor blades (23).

8. A rotor (21) for a fiber material preparation device (1) according to claim 7, It is characterized in that The functional surface (41) is arranged on the rotor shaft (25) adjacent to a surface (35) of the rotor blade (23) facing away from the preferred direction (33) and extends in the circumferential direction (34) only over a partial region of the surface between the rotor blades.

9. A rotor (21) for a fiber material preparation device (1) according to claim 7 or 8, It is characterized in that The rotor (21) is a propeller (51) with a propeller head, which serves as a rotor shaft (25) for the circulation of the fiber suspension.

10. The rotor (21) for a fiber material preparation device (1) according to claim 1, It is characterized in that The functional surface (41) is arranged on the rotor blade (23) in the outflow region (39), wherein the functional surface (41) can vary in extent.

11. The rotor (21) for a fiber material preparation device (1) according to claim 1, It is characterized in that The rotor blade (23) is radially externally formed with a flow surface (40) extending in a circumferential direction (34), and at least one surface region is formed with a functional surface (41) which has an extension in an axial direction (38) at an end of the flow surface (40) facing away from the preferred direction (33).

12. A rotor (21) for a fiber material preparation device (1) according to claim 10 or 11, It is characterized in that The rotor (21) is used in a screening device (9) for separating a fiber mat formed on a screen (11).

13. The rotor (21) for a fiber material preparation device (1) according to claim 1, It is characterized in that The functional surface (41) is formed in the turbulent zone when the rotor (21) is in operation.

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