Pressure screen bar structure

Abstract

The utility model relates to the technical field of papermaking equipment, in particular to a pressure screen bar structure which comprises a cylindrical screen cylinder, an upper flange and a lower flange are arranged at the two ends of the screen cylinder respectively, a reinforcing ring and middle rings are arranged on the outer wall of the screen cylinder, the reinforcing ring is arranged in the center of the outer wall of the screen cylinder, and a plurality of sets of middle rings are arranged in the axial direction of the screen cylinder at equal intervals. A plurality of bar bodies are fixed on the middle ring and are distributed in a circular array along the central axis of the middle ring, and each bar body comprises a fixed part fixedly connected with the middle ring, an extension part is arranged at one end, facing the rotor wing, of the fixed part, the end face of the extension part is inclined, and the end face of the inclined extension part is gradually close to the rotating direction of the rotor wing. According to the bar structure of the pressure screen, on the basis that the aperture ratio of the screen cylinder is guaranteed, vortexes are prevented from occurring, and therefore the yield is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of papermaking equipment, in particular to a pressure screen rod structure. Background Art

[0002] The bars of the pressure screen, also known as screen bars, are the key part of the screen drum and are produced using a wire-binding machine through a special mold.

[0003] Currently, in the papermaking industry, pulp is a suspension containing fibers. When static or flowing slowly, water tends to precipitate, causing the fibers to settle. Therefore, to achieve optimal screening quality during pulp screening, the size, spacing, and structure of the bars must be carefully considered. This ensures that when pulp passes through the slits of the screen drum, water can pass more easily, while fibers have a harder time passing through the slits. This prevents pulp thickening during pressure screen operation, significantly improving production capacity.

[0004] Conventional rod structures are cylindrical or prismatic, and achieve the function of screening by setting an inclined gap. However, the conventional rod structure still has the following shortcomings:

[0005] The low opening rate of the screen drum leads to a decrease in the production capacity of the pressure screen; if the opening rate of the screen drum is increased, the spacing between the bars will be reduced, which will cause eddy current effect and make it impossible to fully guarantee the production capacity. Utility Model Content

[0006] In order to solve the technical problems existing in the background technology, the utility model provides a pressure screen bar structure, which prevents the occurrence of eddy currents on the basis of ensuring the opening rate of the screen drum, thereby ensuring the output.

[0007] The technical solution adopted by the present invention is:

[0008] A pressure screen bar structure comprises a cylindrical screen drum with upper and lower flanges at either axial end. A reinforcement ring and a center ring are radially protruding from the outer wall of the screen drum. The reinforcement ring is positioned in the center of the outer wall of the screen drum. Multiple groups of center rings are arranged at equal intervals along the axial direction of the screen drum. A rod body is fixed to the center ring, with multiple rod bodies arranged in a circular array along the center axis of the center ring.

[0009] The rod body includes a fixing portion fixedly connected to the middle ring, an extension portion protruding from one end of the fixing portion facing the rotor, and an end face of the extension portion being inclined, and the end faces of the inclined extension portion gradually approach each other along the rotation direction of the rotor.

[0010] Furthermore, the extension portion of the rod body is arranged in a fan shape, including: symmetrically arranged along the fixing portion; and flush arranged along one side of the fixing portion.

[0011] Furthermore, the rod body symmetrically arranged along the fixed part includes: a first fixed part fixedly connected to the middle ring, a fan-shaped first extension part protruding from one end of the first fixed part facing the rotor, the first extension part is symmetrically arranged along the first fixed part, and a first inclined end face is provided at one end of the first extension part facing the rotor, and the first inclined end face gradually approaches along the rotation direction of the rotor.

[0012] Furthermore, a first parallel portion is provided on the convex side of the first inclined end surface.

[0013] Furthermore, a second parallel portion is provided on the concave side of the first inclined end surface.

[0014] Furthermore, the rod body, which is arranged flush along one side of the fixing portion, includes: a second fixing portion fixedly connected to the middle ring; a fan-shaped second extension portion is protruding from one end of the second fixing portion facing the rotor; the second extension portion is arranged flush along one side of the second fixing portion; a second inclined end surface is provided on one end of the second extension portion facing the rotor; the second inclined end surface gradually approaches along the rotation direction of the rotor;

[0015] The flush end of the second extending portion and the second fixing portion is arranged on the convex side of the second inclined end surface.

[0016] Furthermore, a third parallel portion is provided on the convex side of the second inclined end surface.

[0017] Furthermore, a fourth parallel portion is provided on the concave side of the second inclined end surface.

[0018] Furthermore, an end of the second extension portion facing the rotor is provided with a concave arc surface, and the concave arc surface gradually approaches along the rotation direction of the rotor.

[0019] Furthermore, the width of the extension portion is 1.8-2.5 mm, and the gap between adjacent extension portions is 0.15-0.35 mm;

[0020] Relative to the end of the fixing portion, the inclined end surface of the extending portion has an inclination angle of 15-30°.

[0021] The beneficial effects of the pressure screen bar structure of the utility model are:

[0022] 1. The screen drum opening rate is increased by the fan-shaped second extension part that is flush with one side of the second fixing part;

[0023] 2. The concave arc surface provided at the end surface of the second fixing portion increases water permeability by utilizing the eddy current effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the pressure screen of the utility model;

[0025] Figure 2 It is a cross-sectional schematic diagram of a screen drum according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the rod body mechanism of Example 1 of the present utility model Figure 1 ;

[0027] Figure 4 This is a schematic diagram of the rod body mechanism of Example 1 of the present utility model Figure 2 ;

[0028] Figure 5 This is a schematic diagram of the rod body mechanism of Example 1 of the present utility model Figure 3 ;

[0029] Figure 6 This is a schematic diagram of the rod body mechanism of Example 1 of the present utility model Figure 4 ;

[0030] Figure 7 This is a schematic diagram of the rod body mechanism of Example 2 of the present utility model Figure 1 ;

[0031] Figure 8 This is a schematic diagram of the rod body mechanism of Example 2 of the present utility model Figure 2 ;

[0032] Figure 9 This is a schematic diagram of the rod body mechanism of Example 2 of the present utility model Figure 3 ;

[0033] Figure 10 This is a schematic diagram of the rod body mechanism of Example 2 of the present utility model Figure 4 ;

[0034] Figure 11 This is a schematic diagram of the rod body mechanism of Example 2 of the present utility model Figure 5 .

[0035] In the picture:

[0036] 10. Screen drum, 11. Upper flange, 12. Lower flange, 13. Reinforcement ring, 14. Middle ring,

[0037] 2. Rod body,

[0038] 210, first fixing portion, 211, first extending portion, 212, first inclined end surface, 213, first parallel portion, 214, second parallel portion,

[0039] 220, second fixing portion, 221, second extending portion, 222, second inclined end surface, 223, third parallel portion, 224, fourth parallel portion, 225, concave arc surface. DETAILED DESCRIPTION

[0040] In order to more clearly and specifically illustrate the specific implementation objectives and implementation methods of the present utility model, the following is a complete description of the technical solution of the present utility model. The described embodiments are only part of the embodiments of the present utility model, not all of them. Without inventive work, all other embodiments based on the embodiments described in the present utility model fall within the scope of protection of the present utility model.

[0041] The utility model provides a pressure screen bar structure, such as Figure 1 As shown, it includes: a cylindrical screen drum 10, with an upper flange 11 and a lower flange 12 provided at both ends of the axial direction of the screen drum 10, and a reinforcement ring 13 and a middle ring 14 protruding along the radial direction of the outer wall of the screen drum 10. The reinforcement ring 13 is provided at the center of the outer wall of the screen drum 10, and the middle ring 14 is provided in multiple groups at equal intervals along the axial direction of the screen drum 10. Figure 2 As shown, a rod body 2 is fixedly mounted on the middle ring 14 , and a plurality of the rod bodies 2 are distributed in a circular array along the central axis of the middle ring 14 .

[0042] Rod body 2, such as Figure 2 As shown, it comprises a fixed portion fixedly connected to the center ring 14, with an extension protruding from the end of the fixed portion facing the rotor. The extension of the rod body 2 is arranged in a fan-shaped manner, including: symmetrical arrangement along the fixed portion; flush arrangement along one side of the fixed portion; and an inclined end surface of the extension, with the end surfaces of the inclined extension gradually approaching each other in the direction of rotation of the rotor. The width of the extension is 1.8-2.5mm; the gap between adjacent extensions is 0.15-0.35mm; and the angle of the inclined end surface of the extension relative to the end of the fixed portion is 15-30°.

[0043] Example 1:

[0044] like Figure 3 As shown, the rod body 2 is symmetrically arranged along the fixed portion, including: a first fixed portion 210 fixedly connected to the middle ring 14, and a fan-shaped first extension portion 211 is protruded from one end of the first fixed portion 210 facing the rotor. The first extension portion 211 is symmetrically arranged along the first fixed portion 210, and a first inclined end surface 212 is provided on the end of the first extension portion 211 facing the rotor. The first inclined end surface 212 gradually approaches along the rotation direction of the rotor.

[0045] Example 2:

[0046] like Figure 4 As shown, based on the embodiment 1, a first parallel portion 213 is provided on the convex side of the first inclined end surface 212 .

[0047] Example 3:

[0048] like Figure 5As shown, based on the embodiment 1, a second parallel portion 214 is provided on the concave side of the first inclined end surface 212 .

[0049] Example 4:

[0050] like Figure 6 As shown, based on the embodiment 1, a first parallel portion 213 is provided on the convex side of the first inclined end surface 212 , and a second parallel portion 214 is provided on the concave side of the first inclined end surface 212 .

[0051] Example 5:

[0052] like Figure 7 As shown, the rod body 2 arranged flush along one side of the fixed part includes: a second fixed part 220 fixedly connected to the middle ring 14, and a fan-shaped second extension part 221 is protruding from one end of the second fixed part 220 facing the rotor. The second extension part 221 is arranged flush along one side of the second fixed part 220, and a second inclined end surface 222 is provided at the end of the second extension part 221 facing the rotor. The second inclined end surface 222 gradually approaches along the rotation direction of the rotor; the flush end of the second extension part 221 and the second fixed part 220 is arranged on the protruding side of the second inclined end surface 222.

[0053] Example 6:

[0054] like Figure 8 As shown, based on the fifth embodiment, a third parallel portion 223 is provided on the convex side of the second inclined end surface 222 .

[0055] Example 7:

[0056] like Figure 9 As shown, based on the fifth embodiment, a fourth parallel portion 224 is provided on the concave side of the second inclined end surface 222 .

[0057] Example 8:

[0058] like Figure 10 As shown, based on Example 5, a third parallel portion 223 is provided on the convex side of the second inclined end surface 222 , and a fourth parallel portion 224 is provided on the concave side of the second inclined end surface 222 .

[0059] Example 9:

[0060] like Figure 11 As shown, based on Example 5, an end of the second extension portion 221 facing the rotor is provided with an inwardly concave arc surface 225 , and the inwardly concave arc surface 225 gradually approaches along the rotation direction of the rotor.

[0061] In summary, the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the contents of the specification. All equivalent changes and modifications of the shape, structure, characteristics and spirit described in the scope of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A pressure screen bar structure, comprising: A cylindrical screen drum (10) is provided with an upper flange (11) and a lower flange (12) at both ends of the axial direction of the screen drum (10), and a reinforcement ring (13) and a middle ring (14) are provided on the outer wall of the screen drum (10) along its radial direction. The reinforcement ring (13) is provided at the center of the outer wall of the screen drum (10), and the middle ring (14) is provided in multiple groups at equal intervals along the axial direction of the screen drum (10). The invention is characterized in that: A rod body (2) is fixedly arranged on the middle ring (14), and a plurality of the rod bodies (2) are distributed in a circular array along the central axis of the middle ring (14); The rod body (2) comprises: A fixing portion is fixedly connected to the middle ring (14), and an extension portion is protruded from one end of the fixing portion facing the rotor. The end surface of the extension portion is arranged in an inclined shape, and the end surface of the inclined extension portion gradually approaches along the rotation direction of the rotor.

2. A pressure screen bar structure according to claim 1, characterized in that: The extension portion of the rod body (2) is arranged in a fan shape and comprises: symmetrically arranged along the fixing portion; It is arranged flush along one side of the fixing portion.

3. A pressure screen bar structure according to claim 2, characterized in that: The rod body (2) is symmetrically arranged along the fixing portion and comprises: A first fixing portion (210) is fixedly connected to the middle ring (14); a fan-shaped first extension portion (211) is protruded from one end of the first fixing portion (210) facing the rotor; the first extension portion (211) is symmetrically arranged along the first fixing portion (210); a first inclined end surface (212) is provided on one end of the first extension portion (211) facing the rotor; the first inclined end surface (212) gradually approaches along the rotation direction of the rotor.

4. A pressure screen bar structure according to claim 3, characterized in that: A first parallel portion (213) is provided on the convex side of the first inclined end surface (212).

5. A pressure screen bar structure according to claim 3 or 4, characterized in that: A second parallel portion (214) is provided on the inner concave side of the first inclined end surface (212).

6. A pressure screen bar structure according to claim 2, characterized in that: A rod body (2) is arranged flush with one side of the fixing portion and comprises: A second fixing portion (220) fixedly connected to the middle ring (14), wherein a fan-shaped second extension portion (221) is protruding from one end of the second fixing portion (220) facing the rotor, the second extension portion (221) is flushly arranged along one side of the second fixing portion (220), and a second inclined end surface (222) is provided at one end of the second extension portion (221) facing the rotor, and the second inclined end surface (222) gradually approaches along the rotation direction of the rotor; The flush ends of the second extension portion (221) and the second fixing portion (220) are arranged on the convex side of the second inclined end surface (222).

7. A pressure screen bar structure according to claim 6, characterized in that: A third parallel portion (223) is provided on the convex side of the second inclined end surface (222).

8. A pressure screen bar structure according to claim 6 or 7, characterized in that: A fourth parallel portion (224) is provided on the inner concave side of the second inclined end surface (222).

9. The pressure screen bar structure according to claim 6, characterized in that: An end of the second extension portion (221) facing the rotor is provided with an inwardly concave arc surface (225), and the inwardly concave arc surface (225) gradually approaches along the rotation direction of the rotor.

10. A pressure screen bar structure according to claim 3 or 6, characterized in that: The width of the extension portion is 1.8-2.5 mm, and the gap between adjacent extension portions is 0.15-0.35 mm; Relative to the end of the fixing portion, the inclined end surface of the extending portion has an inclination angle of 15-30°.

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