Device for ensuring uniform pressure distribution of a hydraulic roller press

Abstract

The invention relates to a roller press (1) for grinding specific materials such as cement raw material, cement clinker and similar materials, said roller press (1) comprising two parallel arranged rollers (2, 3), roller (2) being a fixed roller (2) and roller (3) being a movable roller (3), said rollers (2, 3) being configured to rotate in opposite directions towards each other and being separated by a gap (20), said fixed roller (2) comprising an even load distributor assembly ELD (4), said ELD assembly (4) comprising an outer ring (5) and an inner ring (6), said inner ring (6) being fixed on said fixed roller (2) by fastening means (7) such as screws, said inner ring (6) and said outer ring (5) being connected by one or more spring plate groups (8), said spring plate groups (8) being fixed at an angle Θ varying from 0 degrees to 60 degrees, said outer ring (5) comprising a deflection sensing ring (9).

Description

Technical Field

[0001] This invention relates to a roller press for grinding specific materials such as cement raw materials, cement clinker and similar materials. Background Technology

[0002] In the cement and mineral industries, hydraulic roller presses (HRPs) are used to crush larger solid particles into smaller ones by feeding material through the gap between two parallel rollers rotating in opposite directions. The material is not only crushed by the surfaces of both rollers but also by the particles themselves; this method is called interparticle crushing. An ELD (Equal Load Distributor) is an additional feature of the HRP to utilize the entire width of the rollers for efficient material crushing.

[0003] In existing HRP designs, the ratio of roll diameter to roll width is crucial due to the significant edge effect, i.e., the reduced breakage effect at the roll edge. This is because material overflows from the roll edge, reducing the extrusion pressure of material towards the gap at the roll edge. To address this issue, a uniform load distributor (ELD) is used in HRP, but the following problems have been observed:

[0004] -The leaf springs used in the prior art do not provide prestress, so material overflows through the cheek plate.

[0005] - High deflection causes spring failure.

[0006] - Bending springs have a shorter fatigue life. Summary of the Invention

[0007] The purpose of this invention is to overcome or at least mitigate one or more of the aforementioned problems of the prior art and / or to provide consumers with a useful or commercial option.

[0008] The purpose of this invention is to provide a roller press for grinding specific materials such as cement raw materials, cement clinker and similar materials.

[0009] Another object of the present invention is to provide a uniform load distributor assembly ELD.

[0010] Another object of the present invention is to provide an alternative to the prior art.

[0011] In a first aspect, the present invention relates to a roller press for grinding specific materials such as cement raw materials, cement clinker and similar materials, the roller press comprising two parallel rollers, namely a fixed roller and a movable roller, the rollers being configured to rotate toward each other in opposite directions and separated by a gap, the fixed roller comprising a uniform load distributor assembly ELD comprising an outer ring and an inner ring, the inner ring being fixed to the fixed roller by a fastening device such as screws, the inner ring and the outer ring being connected by one or more spring plate assemblies fixed at an angle θ varying from 0 degrees to 60 degrees, the outer ring comprising a deflection sensing ring.

[0012] The invention features a method for achieving uniform load distribution for crushing by using common rotating rings at both ends of the fixed roller. These common rotating rings are preferably mounted to the fixed roller via spring plates and another fixed ring, which holds all the spring plates thereon. The inner ring is preferably fixed to the fixed roller on each side, and prestress on the ELD ring is achieved through offset of the planar surface, allowing the springs to deflect backward during operation and ensuring that material does not flow through.

[0013] Prestress can be achieved by deflecting the leaf spring so that the spring action generated by the material action will push and hold the feed material.

[0014] The elastic element may include multiple spring plates, preferably made of steel. Adding spring plate assemblies reduces the deflection of the annular disk. A key advantage is that the number of spring plate assemblies can be increased during commissioning or production ramp-up to reduce overall annular disk deflection and extend spring plate life. Stiffness is varied by changing the number of spring plates.

[0015] The elastic element spring plate assembly is not radially connected to the roller end surface. They are preferably inclined at a certain angle relative to the radial direction of the roller. The advantage is that the increased length of the spring plates reduces bending stress due to the reduced distance of the force from the mounting position.

[0016] The deflection sensing ring may include an inner support ring and an outer support ring, with the inner support ring mounted on the outer ring via a fastening mechanism. The outer support ring is preferably mounted on the inner support ring via a fastening mechanism.

[0017] The inner support ring can be mounted on the outer ring using screws with pin holes and nuts and / or via a welded joint. The outer support ring can be mounted on the inner support ring using screws with pin holes and nuts and / or via a welded joint.

[0018] The inner ring is preferably assembled with the outer ring so that there is a difference in distance between the planar surfaces of the outer ring and the inner ring.

[0019] The differential distance affects the preload applied to the stationary rollers. The preload caused by this differential distance ensures that the roller press resists not only the stiffness generated by the spring assembly but also the axial force generated by material abrasion. This also ensures that there is always material retention equal to the amount of axial force it generates.

[0020] A preferred range is 1 to 10 spring plates arranged in a spring plate group to provide variable stiffness to the structure by changing the number of spring plates.

[0021] According to the present invention, the uniform load distributor assembly ELD preferably includes an outer ring and an inner ring. The inner ring can be fixed to a fixed roller by screws. The inner ring and the outer ring are preferably connected by one or more spring plate assemblies. The spring plate assemblies are preferably fixed at an angle θ varying from 0 degrees to 60 degrees. The outer ring may include a deflection sensing ring.

[0022] In a second aspect, the present invention relates to a method for uniformly distributing material under load in a roller press for grinding specific materials such as cement raw materials, cement clinker and similar materials, the method preferably utilizing a uniform load distributor according to a first aspect of the invention.

[0023] The first and second aspects of the present invention can be combined. Attached Figure Description

[0024] The accompanying drawings illustrate one way of implementing the invention and should not be construed as limiting other possible embodiments falling within the scope of the appended claims.

[0025] Figure 1 A roller press for grinding specific materials according to the present invention is illustrated schematically.

[0026] Figure 2 A roller press for grinding specific materials according to the present invention is shown schematically from another angle.

[0027] Figure 3 A roller press and ELD assembly for grinding specific materials according to the present invention are schematically shown.

[0028] Figure 4 The spring plate assembly and spring plate according to the present invention are schematically shown.

[0029] Figure 5 The ELD component according to the present invention is illustrated schematically.

[0030] Figure 6 A spring plate assembly mounted on an ELD assembly according to the invention is shown schematically.

[0031] Figure 7 A spring plate assembly mounted on an ELD assembly according to the invention is shown schematically.

[0032] Figure 8 A spring plate assembly mounted on the inner ring of an ELD assembly according to the invention is shown schematically.

[0033] Figure 9 The ELD component according to the present invention is illustrated schematically. Detailed Implementation

[0034] Figure 1 A preferred embodiment of a roller press for grinding specific materials according to the present invention is illustrated schematically.

[0035] exist Figure 2 and Figure 3 The image also schematically illustrates, from another angle, a roller press and an ELD assembly for grinding specific materials according to the present invention.

[0036] exist Figure 1-3 The present invention discloses a roller press 1 for grinding specific materials such as cement raw materials, cement clinker, and similar materials. The roller press 1 includes two parallel rollers 2 and 3: a fixed roller 2 and a movable roller 3. Rollers 2 and 3 are configured to rotate toward each other in opposite directions and are separated by a gap 20. The fixed roller 2 includes a uniform load distributor assembly ELD4. Figure 5 The above discloses an embodiment of the ELD assembly according to the present invention. The ELD assembly 4 includes an outer ring 5 and an inner ring 6. The inner ring 6 is fixed to a fixed roller 2 by a fastening device 7, such as a screw. The inner ring 6 and the outer ring 5 are connected by one or more spring plate assemblies 8. The spring plate assemblies 8 are fixed at an angle θ varying from 0 degrees to 60 degrees. The outer ring 5 includes a deflection sensing ring 9.

[0037] Figure 5 An ELD assembly according to the present invention is schematically illustrated. The sensing ring 9 includes an inner support ring 13 and an outer support ring 14. The inner support ring 13 is mounted on the outer ring 5 by a fastening mechanism. The outer support ring 14 is mounted on the inner support ring 13 by a fastening mechanism. In a preferred embodiment of the invention, the inner support ring 13 is mounted on the outer ring 5 by screws with pin holes 10 and nuts 11 and / or by a welded joint. The outer support ring 14 is mounted on the inner support ring 13 by screws with pin holes 15 and nuts 16 and / or by a welded joint.

[0038] The inner ring 6 and the outer ring 5 are assembled such that there is a differential distance H17 between the planar surfaces of the outer ring 5 and the inner ring 6. The differential distance H17 affects the preload applied to the fixed roller 2, and the preload caused by this differential distance will ensure that the system resists not only the stiffness generated by the spring assembly but also the axial force generated by material abrasion. This will also ensure that there is always material retention equal to the amount of axial force it generates.

[0039] Figure 4 A spring plate assembly and spring plate according to the invention are schematically shown. A plurality of spring plates 18, ranging from 1 to 10, are arranged in the spring plate assembly 8 so as to provide variable stiffness to the structure by changing the number of spring plates 18.

[0040] Figure 6 , 7 Figures 8 and 9 schematically illustrate how the spring plate assembly is mounted onto the inner ring 6 and the outer ring 5.

[0041] Figure 9 The diagram illustrates how angle θ12 is defined. Angle θ12 is measured between the centerline of spring plate 18 and the line connecting the center point of the connecting roller and the center point of spring plate 18.

[0042] In a preferred embodiment of the invention, the uniform load distributor assembly ELD4 includes an outer ring 5 and an inner ring 6. The inner ring 6 is fixed to the fixed roller 2 by screws 7. The inner ring 6 and the outer ring 5 are connected by one or more spring plate assemblies 8. The spring plate assemblies 8 are fixed at an angle θ varying from 0 degrees to 60 degrees. The outer ring 5 includes a deflection sensing ring 9. Figure 9 The ELD component is schematically shown, revealing the angle θ12.

[0043] The present invention also relates to a method for uniformly distributing material under load in a roller press 1 used for grinding specific materials such as cement raw materials, cement clinker, and similar materials. This method utilizes a uniform load distributor according to any of the above embodiments.

[0044] Although the invention has been described in conjunction with specific embodiments, it should not be construed as being limited in any way to the examples presented. It should also be understood that the forms of the invention shown are merely preferred embodiments. Various variations may occur in the function and arrangement of parts; equivalent devices may replace those illustrated and described; and certain features may be used independently of others without departing from the spirit and scope of the invention as defined by the following claims.

[0045] List of reference numerals

[0046] 1. Roller press

[0047] 2. Fixed roller

[0048] 3. Movable roller

[0049] 4. ELD Components

[0050] 5. Outer Ring Road

[0051] 6. Inner Ring Road

[0052] 7. Screws (for retaining rings)

[0053] 8. Spring plate assembly

[0054] 9. Deflection sensing loop

[0055] 10. Screws with pin holes

[0056] 11. Nuts

[0057] 12. θ — Angle

[0058] 13. Inner support ring

[0059] 14. Outer support ring

[0060] 15. Screws with pin holes

[0061] 16. Nuts

[0062] 17.H—Difference distance

[0063] 18. Spring plate

[0064] 19. Screws (for spring assemblies)

[0065] 20. Gap

Claims

1. A roller press (1) for grinding a specific material, said roller press (1) comprising two parallel arranged rollers (2, 3), namely a fixed roller (2) and a movable roller (3), said rollers (2, 3) being configured to rotate in opposite directions towards each other and being separated by a gap (20), said fixed roller (2) comprising a uniform load distributor assembly (4), said uniform load distributor assembly (4) comprising an outer ring (5) and an inner ring (6), said inner ring (6) being fixed on said fixed roller (2) by fastening means (7), said inner ring (6) and said outer ring (5) being connected by one or more spring plate groups (8), said spring plate groups (8) being fixed at an angle Ɵ varying from 0 degrees to 60 degrees, said outer ring (5) comprising a deflection sensing ring (9).

2. The roll press of claim 1, wherein, Said deflection sensing ring (9) comprises an inner support ring (13) and an outer support ring (14), said inner support ring (13) being mounted on said outer ring (5) by fastening means, said outer support ring (14) being mounted on said inner support ring (13) by fastening means.

3. The roll press of claim 2, wherein, Said inner support ring (13) is mounted on said outer ring (5) by screws with pin holes (10) and nuts (11) and / or by welded joints, said outer support ring (14) is mounted on said inner support ring (13) by screws with pin holes (15) and nuts (16) and / or by welded joints.

4. The roll press according to any one of claims 1 to 3, wherein, Said inner ring (6) is assembled with said outer ring (5) in such a way that there is a differential distance H (17) between the planar surfaces of said outer ring (5) and said inner ring (6).

5. The roll press of claim 4, wherein, Said differential distance H (17) has an influence on the pre-load applied on said fixed roller (2), said pre-load caused by said differential distance will ensure that the roller press resists axial forces generated due to material grinding in addition to the stiffness generated by said spring plate groups.

6. The roll press of claim 1, wherein, A number of spring plates (18) ranging from 1 to 10 are arranged in said spring plate groups (8) in order to provide a variable stiffness to the structure by varying the number of spring plates (18).

7. The roll press of claim 1, wherein, Said specific material is cement raw material, cement clinker.

8. The roll press of claim 1, wherein, Said fastening means (7) are screws.

9. A uniform load distributor assembly (4) configured to be included in a fixed roller of a roller press, said uniform load distributor assembly (4) comprising an outer ring (5) and an inner ring (6), said inner ring (6) being fixed on said fixed roller (2) by screws, said inner ring (6) and said outer ring (5) being connected by one or more spring plate groups (8), said spring plate groups (8) being fixed at an angle Ɵ varying from 0 degrees to 60 degrees, said outer ring (5) comprising a deflection sensing ring (9).

10. A method for uniformly distributing load material in a roller press (1) for grinding a specific material, the method utilizing a uniform load distributor assembly according to claim 9.

11. The method of claim 10, wherein, Said specific material is cement raw material, cement clinker.

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