Device for preventing flange bolt from being broken

Abstract

The utility model relates to the technical field of short-stress rolling mill accessories, in particular to a device for preventing a flange bolt from being broken, which comprises a tension stand column, the upper end and the lower end of the tension stand column are provided with an upper end external connection thread and a lower end external connection thread which are used for being connected with an external connection structure, the tension stand column is provided with a mounting groove, and the mounting groove is provided with a clamping ring. A threaded hole is formed in the mounting groove, and a mounting hole matched with the threaded hole is formed in the clamping ring. Therefore, the device for preventing the flange bolt from being broken can solve the technical problems that a rolling mill is difficult to adjust, the service life of a bearing is shortened and even rolling mill burning accidents are caused due to positioning failure of a pressure-bearing flange and sagging of a left box body and a right box body of the rolling mill.

Description

Technical Field

[0001] This application relates to the field of short-stress rolling mill components, and more specifically, to a device for preventing flange bolts from breaking. Background Technology

[0002] In the field of short-stress rolling mill technology, the mating structure of the pressure-bearing flange and tie rod is a key component for ensuring stable mill operation. In existing technology, the tolerance range for the mating between the inner diameter of the pressure-bearing flange and the outer diameter of the tie rod is typically designed to be 0.12–0.25 mm, with an axial adjustment clearance of 0.1–0.2 mm. The pressure-bearing flange is mostly made of ZCuA110Fe3 (copper alloy), and the tie rod is made of 42CrMo (alloy steel). Due to the relatively soft material of the pressure-bearing flange, it wears preferentially during dynamic friction to protect the tie rod. However, this design causes the M8×10 socket head cap screws used to fix the pressure-bearing flange to be subjected to random impact forces, making them prone to breakage.

[0003] When the screw breaks, the pressure flange loses its positioning function, causing the left and right mill housings to sag. This leads to difficulties in mill adjustment, shortened bearing life, and even mill burnout. Repairs require a major offline overhaul, which is time-consuming and labor-intensive, and removing the broken screw is difficult, resulting in a long repair cycle. Furthermore, replacing critical components such as tie rods is costly, significantly increasing spare parts consumption costs.

[0004] While existing technologies mitigate tie rod wear through material selection, they fail to address the core issue of excessive screw load-bearing capacity. Therefore, a technical solution is urgently needed that can both reduce the risk of screw breakage and decrease maintenance costs. Utility Model Content

[0005] Based on the above problems, this application proposes a device for preventing flange bolt breakage, which solves the technical problem of pressure flange positioning failure, mill left and right box body sagging, resulting in difficulty in mill adjustment, shortened bearing life, and even mill burn-out accidents.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A device for preventing flange bolt breakage includes a tension column, the tension column having an upper external thread and a lower external thread for connecting to an external structure at both ends, the tension column having an installation groove, the installation groove having a retaining ring, the installation groove having a threaded hole, and the retaining ring having an installation hole adapted to the threaded hole.

[0008] In one specific implementation, the diameter of the end of the mounting hole near the threaded hole is smaller than that of the end away from the threaded hole.

[0009] In one specific embodiment, the clamping ring is composed of two symmetrical half rings, and the two symmetrical half clamping ring structures are consistent and are installed in the installation groove.

[0010] In one specific embodiment, the device is suitable for a short stress rolling mill with a roll diameter greater than 530 mm.

[0011] In one specific embodiment, a key groove is arranged at the end of the tension column.

[0012] The positive effects of the utility model are as follows:

[0013] The clamping ring bears the main impact force, and the screw only plays a fixing role, so that the actual wire breaking accidents are reduced by more than 90%.

[0014] After the screw is broken, it does not need to be taken offline for repair, and the clamping ring can be directly fastened or replaced within the roll replacement cycle, so that the repair efficiency is improved by 50%.

[0015] By reducing the box sagging and bearing unbalance caused by screw breakage, the service life of the rolling mill bearing is prolonged by 30%, and the cost of spare parts consumption is reduced.

[0016] The key groove and stepped hole design ensure the structural rigidity, the material type control precision is improved by 15%, and the waste rate is reduced.

[0017] The modular clamping ring design is compatible with the existing rolling mill structure, and is especially suitable for large rolling mills (roll diameter > 530 mm), and the modification cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without creating any creative labor.

[0019] Fig. 1 It is a structural schematic diagram A of the utility model;

[0020] Fig. 2 It is a structural schematic diagram B of the utility model;

[0021] Fig. 3 It is a structural schematic diagram of the clamping ring of the utility model;

[0022] EXPLANATION OF REFERENCE NUMERALS

[0023] 1, tension column; 2, upper end external thread; 3, lower end external thread; 4, clamping ring; 5, threaded hole; 6, installation groove; 7, mounting hole; 8, key groove. DETAILED DESCRIPTION

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Example

[0026] like Figs. 1-3 As shown, a device for preventing flange bolt breakage includes a tension column 1, which has an upper external thread 2 and a lower external thread 3 machined at its upper and lower ends, respectively for connecting the rolling mill box and the base; an annular mounting groove 6 is provided in the middle for fixing the retaining ring 4; and a keyway 8 is provided at the end for connecting and reinforcing the rigid fixation with the external structure.

[0027] The keyway 8 engages with the external key to eliminate axial and circumferential sliding between the tension column 1 and the housing, reducing vibration transmission to the screw.

[0028] The retaining ring 4 consists of two symmetrical semi-rings made of high-strength alloy steel (such as 42CrMo), with a hardness higher than that of the pressure-bearing flange. The two symmetrical semi-rings 4 have identical structures. The outer surface of the retaining ring 4 is tightly fitted to the inner wall of the mounting groove 6, while the inner surface contacts the upper pressure-bearing flange. The retaining ring 4 has mounting holes 7 that align with the threaded holes 5 in the mounting groove 6, and is secured with bolts. The diameter of the mounting hole 7 at the end closest to the threaded hole 5 is smaller than that at the end furthest away.

[0029] Insert the retaining ring 4, which consists of two symmetrical semi-rings, into the mounting groove 6 of the tension column 1 to ensure that the joints of the semi-rings are aligned.

[0030] High-strength bolts are used to pass through the mounting hole 7 and the threaded hole (5), with a preload torque of 50-60 N·m;

[0031] The tension column 1 is connected to the rolling mill box and the base respectively through the upper external thread 2 and the lower external thread 3;

[0032] Install a flat key (made of 45 steel) in keyway 8 to ensure that there is no relative displacement between the tension column and the housing.

[0033] During the rolling process, the dynamic load is transmitted to the tension column 1 through the mill box. The retaining ring 4 contacts the external upper pressure flange, dispersing the impact force that was originally borne by the screw to the retaining ring 4 and the tension column 1 body.

[0034] The symmetrical split structure of the retaining ring 4 ensures uniform load distribution and avoids local stress concentration.

[0035] Finally, it should be noted that, in this document, the term "only" is used simply to set off from another element, rather than to necessarily require or imply that only that one element is present. Also, the terms "comprise," "comprises" and "comprising" or any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0036] The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for preventing breakage of a flange bolt, characterized by, The utility model relates to a tension column, which comprises a tension column (1) provided with an upper end external thread (2) and a lower end external thread (3) at both ends for connecting with external structures, an installation groove (6) provided on the tension column (1), a snap ring (4) provided on the installation groove (6), a threaded hole (5) provided on the installation groove (6), and an installation hole (7) provided on the snap ring (4) and matched with the threaded hole (5).

2. A device for preventing breakage of a flange bolt according to claim 1, characterized in that, The diameter of one end of the installation hole (7) close to the threaded hole (5) is smaller than that of the other end away from the threaded hole (5).

3. A device for preventing breakage of a flange bolt according to claim 1, wherein The snap ring (4) is composed of two symmetrical half rings, and the two symmetrical half snap rings (4) have the same structure and are installed in the installation groove (6).

4. A device for preventing breakage of a flange bolt according to claim 1, wherein The device is suitable for short stress rolling mills with a roller diameter greater than 530 mm.

5. A device for preventing breakage of a flange bolt according to claim 1, wherein A key groove (8) is provided at the end of the tension column (1).

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