Rotor structure of paper pulp pressurized screen

Abstract

The utility model discloses a paper pulp pressurized screen rotor structure, which relates to the technical field of pressurized screens, and comprises a shaft sleeve, a conical barrel and a cylinder which are sequentially welded and fixedly connected from top to bottom along the axial direction, the cylinder is provided with a convex rotor wing through the mounting groove, and the rotor wing is detachably mounted in the mounting groove through a fixing bolt; the rotor wing further comprises a mounting surface, a slurry pushing surface and a slurry sucking surface, the slurry pushing surface and the slurry sucking surface are connected and protrude outwards, and the head of the rotor wing is triangular. The rotor wing is detachably installed, the structure of the rotor wing head is improved, the size of the rotor wing head is reduced, installation and replacement are easy, the maintenance cost is low, positive pressure pulses of the rotor wing head to fiber bundles are milder, and the back suction amount of fibers under negative pressure is reduced.

Description

Technical Field

[0001] This utility model relates to the field of pressure screen technology, specifically to a rotor structure for a pulp pressure screen. Background Technology

[0002] Pressure screens are used in the preparation of pulp fiber suspensions. The structure of a pressure screen consists of a screen drum, rotor blades, a shell, and a transmission device. The working principle of a pressure screen is as follows: Pulp enters the screen drum through the inlet pipe at a certain pressure. Good pulp passes through the screen holes on the drum under the action of the internal and external pressure difference, while pulp residue gradually moves from top to bottom to the discharge pipe. The gap between the pressure screen rotor blades and the screen drum is very small. At the front of the rotor, as the gap between the pushing surface and the screen surface gradually decreases, the pressure on the pulp gradually increases, which facilitates the smooth passage of good pulp fibers through the screen drum. At the tail of the rotor, as the gap between the suction surface and the screen surface gradually increases, the pressure on the pulp gradually decreases and a negative pressure appears, which acts as a suction force on the pulp. This causes the pulp to backflush, achieving a self-cleaning effect on the screen drum and preventing screen hole blockage.

[0003] Traditional pressure screen rotors are welded and fixed to the drum. Over time, these rotors become damaged from friction and impact, eventually malfunctioning and requiring replacement. Repairing them involves cutting away the damaged parts, smoothing them out, and then welding on new rotors – a time-consuming and labor-intensive process. Furthermore, the excessively thick rotor head exerts excessive force on the fiber bundles, causing them to be forcefully squeezed through the screen holes. Due to the excessive positive pressure pulse, the amount of fiber re-absorbed under negative pressure after passing through the screen drum is also high.

[0004] To address the aforementioned issues, we provide a pulp pressure screen rotor structure. Utility Model Content

[0005] The purpose of this utility model is to provide a pulp pressure screen rotor structure that solves the problems of inconvenient replacement of traditional pressure screen rotors due to welding and fixing, excessive thrust on fiber bundles due to excessive thickness of traditional rotor heads, and high fiber back-suction under negative pressure.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a pulp pressure screen rotor structure, comprising a bushing, a conical cylinder, and a cylindrical body that are sequentially welded and fixedly connected from top to bottom along the axial direction. The outer wall of the cylindrical body is provided with a recessed mounting groove, and at least two sets of threaded holes are provided in the mounting groove. The cylindrical body is fitted with an outwardly protruding rotor through the mounting groove. The rotor is provided with at least two sets of mounting holes. The rotor is detachably installed in the mounting groove by fixing bolts, and the fixing bolts pass through the mounting holes and connect with the threaded holes.

[0007] The rotor also includes a mounting surface, a pushing surface, and a suction surface. The mounting hole is located on the suction surface. The pushing surface and the suction surface are connected and protrude outward. The head of the rotor is triangular.

[0008] Preferably, the rotors are symmetrically distributed around the axial direction of the cylinder, and the rotors on the cylinder are staggered circumferentially from top to bottom.

[0009] Preferably, the rotors on the cylindrical body have the same shape.

[0010] Preferably, the shape of the mounting groove is adapted to the shape of the rotor, the mounting surface of the rotor protrudes outward, and the groove depth at the protruding position of the mounting surface corresponding to the mounting groove is greater than the groove depth at both ends of the rotor corresponding to the mounting groove.

[0011] Preferably, the rotor is thicker in the middle and thinner at both ends, with a short head and long tail, and the fixing bolts are connected at the thickest part of the rotor wall.

[0012] This utility model has the following beneficial effects:

[0013] 1. The rotor of this utility model is detachable and easy to install and replace, with low maintenance cost. Compared with welding fixation, it reduces the grinding and welding process during maintenance, saving time and effort.

[0014] 2. The rotor of this utility model improves the rotor head structure, reduces the rotor head size, and reduces the thrust of the rotor head on the fiber bundle. The triangular head has a gradually increasing thrust on the mixing pulp, making the positive pressure pulse of the rotor head on the fiber bundle more gentle, which can effectively solve the problem of high fiber back suction caused by excessive positive pressure pulse. Attached Figure Description

[0015] Figure 1 This is a front view of the present utility model;

[0016] Figure 2 This is a top view of the present invention;

[0017] Figure 3 This is a perspective view of the present utility model;

[0018] Figure 4 This is a schematic diagram of the mounting groove structure on the cylindrical body of this utility model;

[0019] Figure 5 This is a cross-sectional view of the present invention;

[0020] Figure 6 This is a schematic diagram of the rotor structure of this utility model;

[0021] Figure 7 This is a top view of the cylindrical body of this utility model.

[0022] In the diagram: 1. Bushing; 2. Conical cylinder; 3. Cylinder; 31. Mounting groove; 32. Threaded hole; 4. Rotor; 41. Mounting hole; 42. Mounting surface; 43. Pushing surface; 44. Suction surface; 5. Fixing bolt. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figure 1-7 As shown, this utility model provides a technical solution: a pulp pressure screen rotor structure, including a bushing 1, a conical cylinder 2 and a cylindrical body 3 that are welded and fixedly connected from top to bottom along the axial direction;

[0025] The outer wall of the cylindrical body 3 is provided with a recessed mounting groove 31. The mounting groove 31 is provided with at least two sets of threaded holes 32. The shape of the mounting groove 31 is adapted to the shape of the rotor 4. The cylindrical body 3 is installed with the protruding rotor 4 through the mounting groove 31. The rotors 4 on the cylindrical body 3 have the same shape, which ensures uniformity and is easy to install and has low manufacturing cost.

[0026] The rotors 4 are symmetrically distributed around the axis of the cylindrical body 3, and the rotors 4 on the cylindrical body 3 are staggered in the circumferential direction from top to bottom. The rotors 4 are detachably installed in the mounting groove 31 by fixing bolts 5. The fixing bolts 5 pass through the mounting hole 41 and are connected to the threaded hole 32. The rotors 4 can be detached and installed, which is simple to install and replace and has low maintenance cost. Compared with welding and fixing, it reduces the grinding and welding process during maintenance, saving time and effort.

[0027] The rotor 4 is thick in the middle and thin at both ends, with a short head and a long tail. The rotor 4 has at least two sets of mounting holes 41. The rotor 4 also includes a mounting surface 42, a slurry pushing surface 43, and a slurry suction surface 44. The mounting holes 41 are set on the slurry suction surface 44. The slurry pushing surface 43 and the slurry suction surface 44 are connected and protrude outward. The head of the rotor 4 is triangular. The mounting surface 42 of the rotor 4 protrudes outward. The groove depth at the protruding position of the mounting surface 42 corresponding to the mounting groove 31 is greater than the groove depth at both ends of the rotor 4 corresponding to the mounting groove 31. The fixing bolt 5 is connected at the position of the thick wall of the rotor 4. The tail of the rotor 4 smoothly transitions tangentially to the wall of the cylindrical body 3.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pulp pressure screen rotor structure, comprising a bushing (1), a conical cylinder (2), and a cylindrical body (3) welded and fixedly connected sequentially from top to bottom along the axial direction, characterized in that: The outer wall of the cylindrical body (3) is provided with a recessed mounting groove (31). The mounting groove (31) is provided with at least two sets of threaded holes (32). The cylindrical body (3) is provided with an outwardly protruding rotor (4) through the mounting groove (31). The rotor (4) is provided with at least two sets of mounting holes (41). The rotor (4) is detachably installed in the mounting groove (31) by fixing bolts (5). The fixing bolts (5) pass through the mounting holes (41) and connect to the threaded holes (32). The rotor (4) also includes a mounting surface (42), a slurry pushing surface (43) and a slurry suction surface (44). The mounting hole (41) is provided on the slurry suction surface (44). The slurry pushing surface (43) and the slurry suction surface (44) are connected and protrude outward. The head of the rotor (4) is triangular.

2. The pulp pressure screen rotor structure according to claim 1, characterized in that: The rotors (4) are symmetrically distributed around the axis of the cylindrical body (3), and the rotors (4) on the cylindrical body (3) are staggered in the circumferential direction from top to bottom.

3. The pulp pressure screen rotor structure according to claim 1, characterized in that: The rotor (4) on the cylindrical body (3) has the same shape.

4. The pulp pressure screen rotor structure according to claim 1, characterized in that: The shape of the mounting groove (31) is adapted to the shape of the rotor (4). The mounting surface (42) of the rotor (4) protrudes outward, and the groove depth at the protruding position of the mounting surface (42) corresponding to the mounting groove (31) is greater than the groove depth at both ends of the rotor (4) corresponding to the mounting groove (31).

5. The pulp pressure screen rotor structure according to claim 1, characterized in that: The rotor (4) is thick in the middle and thin at both ends. The rotor (4) has a short head and a long tail. The fixing bolt (5) is connected at the thick part of the rotor (4). The tail of the rotor (4) smoothly transitions to the wall of the cylindrical body (3) along the tangential direction of the wall.

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