A trunnion for a coal mill roller

Abstract

The utility model relates to coal mill grinding roller device technical field especially relates to a kind of trunnion of coal mill grinding roller, including trunnion, trunnion seat and trunnion cover;The inside of trunnion seat is equipped with bushing;The flange of one end of trunnion is equipped with, and the other end is sleeved in bushing;The inside of trunnion seat is hollow ball-and-socket shape;The bushing is hollow truncated sphere;It is non-rigid connection between the inside of trunnion seat and the outside of bushing.The utility model changes the sliding bearing structure of trunnion seat into trunnion structure, reduces the requirement to both sides concentricity while can reduce the stress generated due to eccentricity when operating, avoid the fracture of connecting bolt between trunnion and the grinding roller head of coal mill grinding roller.

Description

Technical Field

[0001] This utility model relates to the technical field of coal mill grinding roller devices, and in particular to a self-aligning trunnion for a coal mill grinding roller. Background Technology

[0002] Traditional coal mills use bolts to fasten the grinding roller assembly to the trunnion, which cannot withstand the impact and weight of the grinding roller assembly for a long time, and the bolts often experience fatigue fracture.

[0003] In existing technologies, trunnion seats typically employ a sliding bearing structure, with the trunnion and grinding roller head connected via a bushing structure concentric with the trunnion seat. Patent CN222446707U discloses a novel trunnion and grinding roller device, where a sleeve is provided on the grinding roller head, and the trunnion is inserted into the sleeve, representing a socket-type flexible connection structure between the grinding roller head and the trunnion. Patent CN214765855U discloses a novel coal mill grinding roller trunnion device, which shifts the trunnion's rotational center of gravity to the grinding roller head by providing left and right extended trunnions, thus primarily absorbing the weight of the entire grinding roller and the variable load impact force generated during grinding. Patent CN209631332U discloses a coal mill grinding roller support structure, which improves the stress-damage resistance of the connection structure through the sleeve connection between the trunnion and the support sleeve and housing.

[0004] While the above solutions can all address the issue of trunnion bolt breakage, all methods—whether using sliding bearing bushings, socket connections, or extended housings—require extremely high concentricity on both sides of the trunnion seat during installation. However, under the influence of the immense grinding force, impact loads, thermal deformation, and foundation settlement of the coal mill, misalignment of the trunnion seats inevitably occurs during mill roller operation. This difference between static installation accuracy and dynamic operating conditions is the fundamental reason why the bolts at the connection point bear enormous additional bending stress.

[0005] Therefore, how to automatically adjust the concentricity of the trunnions on both sides of the coal mill roller to fundamentally avoid the breakage of the trunnion connecting bolts is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a self-aligning trunnion for a coal mill roller.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a self-aligning trunnion for a coal mill roller, comprising a trunnion, a trunnion seat, and a trunnion cover;

[0008] The trunnion seat has a bushing on its inner side; one end of the trunnion has a flange, and the other end is fitted into the bushing;

[0009] The outer side of the trunnion seat is provided with a reducing flange; the reducing flange includes a large diameter portion and a small diameter portion; the small diameter portion is provided with several through holes; the trunnion cover is provided with several trunnion cover bolts; each trunnion cover bolt passes through each through hole to fix the trunnion cover to the trunnion seat.

[0010] Furthermore, the inner side of the trunnion seat is a hollow ball-and-socket shape.

[0011] Furthermore, the bushing is a hollow truncated sphere.

[0012] Furthermore, the connection between the inner side of the trunnion seat and the outer side of the bushing is non-rigid.

[0013] Furthermore, the flange is provided with a plurality of trunnion bolts; the trunnion is fixed to the grinding head of the coal mill grinding roller by means of the trunnion bolts.

[0014] Furthermore, the large-diameter section is provided with several trunnion seat bolts; the trunnion seat is fixed to the housing of the coal mill roller by the trunnion seat bolts.

[0015] The beneficial effects of this utility model are: the sliding bearing structure of the trunnion seat is changed to a self-aligning structure, which reduces the requirements for concentricity on both sides and reduces the stress caused by misalignment during operation, thus preventing the connecting bolts between the trunnion and the grinding roller head of the coal mill from breaking. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 3 This is an installation diagram of this utility model;

[0020] Figure 4 This is a schematic diagram of the overall structure of the trunnion seat of this utility model;

[0021] Figure 5 This is a schematic diagram of the overall structure of the bushing in this utility model.

[0022] In the figure: 1. Trunnion, 2. Bushing, 3. Trunnion seat, 4. Trunnion cover, 5. Flange, 6. Reducing flange, 61. Major diameter section, 62. Minor diameter section, 7. Trunnion bolt, 8. Trunnion seat bolt, 9. Trunnion cover bolt, 10. Through hole. 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. It should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "fixing", and "connection" should be interpreted broadly. For those skilled in the art, the specific meaning of the above terms in this patent can be understood according to the specific circumstances.

[0024] like Figure 1 As shown, a self-aligning trunnion for a coal mill roller includes a trunnion 1, a trunnion seat 3, and a trunnion cover 4. The outer side of the trunnion seat 3 is provided with a reducing flange 6, which includes a large diameter portion 61 and a small diameter portion 62. The large diameter portion 61 is provided with a plurality of trunnion seat bolts 8 evenly distributed along its circumference. One end of the trunnion 1 is provided with a flange 5, which is provided with a plurality of trunnion bolts 7 evenly distributed along its circumference. The trunnion cover 4 is provided with a plurality of trunnion cover bolts 9 evenly distributed along its circumference.

[0025] like Figure 2 and Figure 3 As shown, a bushing 2 is provided on the inner side of the trunnion seat 3, and the end of the trunnion 1 without the flange 5 is fitted into the bushing 2. Figure 3 As shown, the small diameter portion 62 is provided with a plurality of through holes 10 corresponding to the trunnion cap bolts 9 evenly around its periphery. When installing the trunnion cap 4, each trunnion cap bolt 9 is inserted into each through hole 10 and tightened, thereby fixing the trunnion cap 4 to the trunnion seat 3.

[0026] like Figure 4 As shown, the inner side of the trunnion 3 is a hollow ball-and-socket shape.

[0027] like Figure 5 As shown, bushing 2 is a hollow truncated sphere.

[0028] When the aforementioned self-aligning trunnions are installed on the coal mill grinding roller, each trunnion seat bolt 8 extends into the corresponding hole on the coal mill grinding roller housing and is tightened, thereby fixing the trunnion seat 3 to the housing. Simultaneously, each trunnion bolt 7 extends into the corresponding hole on the grinding roller head and is tightened, thereby fixing the trunnion 7 to the grinding roller head. The coal mill grinding roller housing and grinding roller head are common and universal components in the technical field involved in this utility model, and therefore are not specifically shown in the accompanying drawings.

[0029] During operation, under the constraint of bushing 2, trunnion 1 does not directly contact the inner side of trunnion seat 3. The axial direction of trunnion 1 depends on bushing 2. The spherical outer side of bushing 2 is not rigidly connected to the inner side of trunnion seat 3. In this way, when the coal mill roller is working, trunnion 1 can freely deflect within a certain angle through bushing 2, completely eliminating the additional stress caused by misalignment during installation or foundation settlement, and preventing the trunnion bolt 7 connecting trunnion 1 and the grinding roller head of the coal mill roller from breaking.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A self-aligning trunnion for a coal mill roller, characterized in that, It includes a trunnion (1), a trunnion seat (3), and a trunnion cover (4); The trunnion seat (3) is provided with a bushing (2) on its inner side; one end of the trunnion (1) is provided with a flange (5), and the other end is fitted into the bushing (2); The outer side of the trunnion seat (3) is provided with a reducing flange (6); the reducing flange (6) includes a large diameter part (61) and a small diameter part (62); the small diameter part (62) is provided with a plurality of through holes (10); the trunnion cover (4) is provided with a plurality of trunnion cover bolts (9); each trunnion cover bolt (9) passes through each through hole (10) to fix the trunnion cover (4) to the trunnion seat (3).

2. The self-aligning trunnion of a coal mill roller according to claim 1, characterized in that, The inner side of the trunnion seat (3) is a hollow ball-shaped socket.

3. The self-aligning trunnion of a coal mill roller according to claim 1, characterized in that, The bushing (2) is a hollow truncated sphere.

4. A self-aligning trunnion for a coal mill roller according to any one of claims 1 to 3, characterized in that, The inner side of the trunnion seat (3) and the outer side of the bushing (2) are non-rigidly connected.

5. The self-aligning trunnion of a coal mill roller according to claim 1, characterized in that, The flange (5) is provided with a number of trunnion bolts (7); the trunnion (1) is fixed to the grinding head of the coal mill grinding roller by the trunnion bolts (7).

6. The self-aligning trunnion of a coal mill roller according to claim 1, characterized in that, The large-diameter section (61) is provided with a number of trunnion seat bolts (8); the trunnion seat (3) is fixed to the housing of the coal mill grinding roller by means of the trunnion seat bolts (8).

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