A hydraulic bearing device for a twenty-roller mill housing

Abstract

The utility model discloses a kind of hydraulic bearing devices for twenty-roller mill frame machining, including outer sleeve, end cap, inner sleeve and extension sleeve, inner sleeve is coaxially arranged in the inner side of outer sleeve, and the extension sleeve coaxial with it is integrally formed and processed in one end of outer sleeve, the inner diameter of extension sleeve is less than the inner diameter of outer sleeve and forms step at the interface of both;The other end of outer sleeve is fixedly connected with end cap by bolt, and through hole for high-precision boring bar is provided in the middle of end cap. The hydraulic bearing device can make the tooling composed of high-precision wallboard and high-precision boring bar and the like, ensure the machining precision of mill frame plum-blossom cavity, make the deformation of roll system extremely small during rolling process, obtain very accurate thickness deviation in the whole width direction of rolling, and have the advantages of simple operation, high reliability, low cost and the like.

Description

Technical Field

[0001] This utility model relates to a hydraulic bearing device, specifically a hydraulic bearing device for processing the archway of a 20-roll mill. Background Technology

[0002] Traditionally, the machining of plum blossom cavities primarily relies on vertical boring machines. However, the structural characteristics of vertical boring machines and the excessively long spindle extension during machining result in a significant impact of gravity on the spindle, leading to deflection deformation. Furthermore, the workpiece itself is heavy, making it difficult to maintain the movement accuracy of the boring machine's worktable when bearing such weight. Therefore, machining plum blossom cavities using boring machines cannot meet the precision requirements of high-precision rolling mills. The precision of the plum blossom cavity directly affects the thickness deviation of cold-rolled strip.

[0003] To solve the above problems, a tooling for processing the 20-roll mill arch was invented. The tooling requires the use of bearings. Due to the heavy weight of the 20-roll mill arch itself and the high processing accuracy required, the traditional ball bearings are not accurate enough and are easily damaged, i.e., they are not very stable. Utility Model Content

[0004] The purpose of this utility model is to provide a hydraulic bearing device for the processing of archways in a 20-roll mill, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A hydraulic bearing device for machining the arch of a 20-roll mill includes an outer sleeve, an end cap, an inner sleeve, and an extension sleeve. The inner sleeve is coaxially mounted on the inner side of the outer sleeve. An extension sleeve, coaxial with the inner sleeve, is integrally formed at one end of the outer sleeve. The inner diameter of the extension sleeve is smaller than that of the outer sleeve, and a step is formed at their junction. An end cap is bolted to the other end of the outer sleeve. A through hole for a high-precision boring bar is formed in the center of the end cap. Multiple annular grooves A are formed on the outer surface of the inner sleeve, one of which... The annular groove A corresponds to the oil inlet hole on the surface of the outer sleeve, and the annular groove A and the oil inlet hole are connected. The surface of the extension sleeve is provided with an oil sucker pipe A perpendicular to its center, and the oil sucker pipe A connects the inner wall and the outer wall of the extension sleeve. The inner wall of the outer sleeve is provided with an oil sucker pipe B distributed along its axial direction, and the oil sucker pipe B connects to the oil sucker pipe A. The outer surface of the outer sleeve is also provided with an oil sucker port that connects to the oil sucker pipe B. In actual use, the oil sucker port and the hole connecting the oil sucker pipe A to the outer wall can both be connected to the input end of the oil pump.

[0007] As a further embodiment of this utility model: one end of the inner sleeve is contacted and disposed at one end of the step, and the inner diameter of the step is greater than the inner diameter of the inner sleeve and less than the outer diameter of the inner sleeve.

[0008] As a further embodiment of this utility model, a sealing ring is provided between the other end of the outer sleeve and the end cap.

[0009] As a further embodiment of this utility model: the inner wall of the inner sleeve is provided with a hydraulic oil flow channel, and an oil outlet is provided in the hydraulic oil flow channel, which connects the inner wall and the outer wall of the inner sleeve.

[0010] As a further embodiment of this utility model: the output end of the oil pump is connected to the oil storage tank, and the input end of the oil delivery pump is also connected to the oil storage tank. The oil storage tank can be replenished with the lost oil as needed.

[0011] As a further aspect of this utility model: during actual operation, the lubricating oil input under high pressure passes between the outer sleeve and the inner sleeve, between the inner sleeve and the high-precision boring bar, and then seeps from the corresponding position at the end of the sleeve that contacts the step, and concentrates at the annular groove B formed between the high-precision boring bar and the step.

[0012] As a further embodiment of this utility model: when actually installed on the 20-roll mill stand, there are two hydraulic bearing devices, which are respectively set between the openings on the high-precision wall plates installed at both ends of the 20-roll mill stand and the high-precision boring bars.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] The use of hydraulic bearing devices enables the tooling, composed of high-precision wall plates and high-precision boring bars, to ensure the machining accuracy of the rolling mill stand's plum blossom cavity, minimizing the deformation of the roll system during rolling. This allows for very precise thickness deviations across the entire width of the rolling mill, and offers advantages such as ease of operation, high reliability, and low cost.

[0015] Firstly, regarding improving machining accuracy:

[0016] By using a boring bar fixture fixed at both ends with hydraulic bearings, the mill stand can be machined without moving, thus ensuring a high level of dimensional accuracy for the plum blossom cavity. For example, the dimensional tolerance can be controlled within a very small range (0.002mm), achieving higher dimensional and positional accuracy compared to a vertical boring machine, making the fit between the mill stand and the roll system tighter and more accurate.

[0017] Secondly, in terms of improving processing efficiency and enhancing processing stability:

[0018] By using a boring bar fixture fixed at both ends with hydraulic bearings, the machining process of the plum blossom cavity is simplified, the machining steps and operation steps are reduced, the influence of human factors on the machining process is reduced, and the machining process is made more stable and reliable.

[0019] Finally, regarding reducing processing costs:

[0020] Hydraulic bearing devices have a long service life, and high-precision machining tooling can improve machining accuracy, reducing material scrap and waste caused by machining errors. Because tooling improves machining accuracy and stability, it reduces wear and damage to the rolling mill equipment, thereby lowering equipment maintenance costs. Furthermore, in the long term, high-precision rolling mill stand mortise and tenon joints can extend the rolling mill's service life, reduce equipment replacement frequency, and further reduce costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the hydraulic bearing device used in the processing of the archway of a 20-roll mill.

[0022] Figure 2 A three-dimensional schematic diagram of the external appearance of the hydraulic bearing device used in the processing of the archway of a 20-roll mill.

[0023] Figure 3 This is a schematic diagram of the hydraulic bearing device used in the processing of the archway of a 20-roll mill. Detailed Implementation

[0024] 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.

[0025] Please see Figures 1-3 In this embodiment of the utility model, a hydraulic bearing device for processing the arch of a 20-roll mill includes an outer sleeve 1, an end cap 2, a sealing ring 3, an inner sleeve 4, an oil inlet 5, an annular groove A6, an oil outlet 7, a hydraulic oil flow channel 8, an annular groove B9, a step 10, an oil extraction pipe A11, an extension sleeve 12, an oil extraction pipe B13, and an oil extraction port 14. The inner sleeve 4 is coaxially arranged inside the outer sleeve 1. An extension sleeve 12 is integrally formed at one end of the outer sleeve 1 and is coaxial with it. The inner diameter of the extension sleeve 12 is smaller than the inner diameter of the outer sleeve 1, and a step 10 is formed at the junction of the two. One end of the inner sleeve 4 is in contact with one end of the step 10. The inner diameter of the step 10 is greater than the inner diameter of the inner sleeve 4 and smaller than the outer diameter of the inner sleeve 4.

[0026] The other end of the outer sleeve 1 is fixedly connected to the end cap 2 by bolts. The end cap 2 has a through hole in the middle for a high-precision boring bar to pass through. A sealing ring 3 is pressed between the other end of the outer sleeve 1 and the end cap 2.

[0027] The outer surface of the inner sleeve 4 is provided with a plurality of annular grooves A6, one of which corresponds to the oil inlet hole 5 opened on the surface of the outer sleeve 1, and the annular groove A6 and the oil inlet hole 5 are connected. When the oil inlet hole 5 is connected to the output end of the oil pump, the high pressure lubricating oil will be filled into the annular groove A6 and then gradually penetrate into the space between the outer sleeve 1 and the inner sleeve 4 to reduce the rotational friction between the two, so that the outer sleeve 1 and the inner sleeve 4 can rotate relative to each other.

[0028] The inner wall of the inner sleeve 4 is provided with a hydraulic oil flow channel 8, and an oil outlet 7 is provided in the hydraulic oil flow channel 8. The oil outlet 7 connects the inner wall and the outer wall of the inner sleeve 4, so that the lubricating oil continuously filled between the outer sleeve 1 and the inner sleeve 4 can flow out a portion from the oil outlet 7 to the inner sleeve 4 and the high-precision boring bar, thereby reducing the friction between the two. The extension sleeve 12 in the hydraulic bearing device is fixedly connected to the high-precision wall plate by bolts to prevent the hydraulic bearing device from running off-center.

[0029] The extension sleeve 12 has a vertically centered oil extraction tube A11 on its surface, which connects the inner and outer walls of the extension sleeve 12. The outer sleeve 1 has an axially distributed oil extraction tube B13 inside its inner wall, which connects to the oil extraction tube A11. Specifically, the oil extraction tube A11 is first drilled through the inner and outer walls of the extension sleeve 12, and then a hole is drilled from the other end of the outer sleeve 1 to connect it to the oil extraction tube B13. The outer surface of the outer sleeve 1 also has an oil extraction port 14 connected to the oil extraction tube B13. In actual use, both the oil extraction port 14 and the hole connecting the oil extraction tube A11 to the outer wall can be connected to the input end of the oil pump to facilitate the recovery of hydraulic oil.

[0030] Alternatively, if necessary, the hole connecting the oil extraction pipe 11 to the outer wall of the extension sleeve 12 can be sealed with a plug during use.

[0031] The output end of the oil pump is connected to the oil storage tank, and the input end of the oil delivery pump is also connected to the oil storage tank. The oil storage tank can be replenished with lost oil as needed.

[0032] In actual operation, the lubricating oil, which is input under high pressure, passes between the outer sleeve 1 and the inner sleeve 4, between the inner sleeve 4 and the high-precision boring bar, and then seeps from the corresponding position at the end of the sleeve 4 that contacts the step 10, and concentrates at the annular groove B9 formed between the high-precision boring bar and the step 10, so that it can be pumped away.

[0033] When using the modified hydraulic bearing device, a mechanical seal is installed between the extension sleeve 12 and the outer surface of the high-precision boring bar to reduce leakage; at the same time, a mechanical seal is also installed between the inner wall of the end cover 2 and the outer surface of the high-precision boring bar to further seal the end.

[0034] like Figure 3When actually installed on the 20-roll mill stand, there are two hydraulic bearing devices, which are respectively set between the openings on the high-precision wall plates installed at both ends of the 20-roll mill stand and the high-precision boring bars, so as to facilitate the use of tooling.

[0035] The fixture, composed of high-precision wall panels, high-precision hydraulic bearing devices, and high-precision boring bars, is installed on a boring machine in a suitable work area. It is securely fixed with bolts and other connectors to ensure it does not loosen during machining. Simultaneously, a micrometer and other tools are used to precisely adjust the fixture's level, ensuring its installation accuracy meets preset requirements. The rolling mill archway blank is then hoisted to the fixture's position. The fixture's built-in positioning device is used to position the archway, initially determining the relative position of the archway's plum blossom cavity machining area with the fixture's cutting tool. After installation, a coordinate measuring machine is used to verify that the front and rear holes of the archway wall panels are at the same horizontal level.

[0036] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydraulic bearing device for processing the arch of a 20-roll mill, comprising an outer sleeve (1), an end cap (2), an inner sleeve (4), and an extension sleeve (12), characterized in that, An inner sleeve (4) is coaxially arranged inside the outer sleeve (1). An extension sleeve (12) is integrally formed at one end of the outer sleeve (1) and is coaxial with it. The inner diameter of the extension sleeve (12) is smaller than the inner diameter of the outer sleeve (1) and a step (10) is formed at the junction of the two. An end cap (2) is fixedly connected to the other end of the outer sleeve (1) by bolts. A through hole for a high-precision boring bar to pass through is opened in the middle of the end cap (2). Multiple annular grooves A (6) are opened on the outer surface of the inner sleeve (4). One of the annular grooves A (6) corresponds to the oil inlet hole (5) opened on the surface of the outer sleeve (1). (6) and the oil inlet (5) are connected; the surface of the extension sleeve (12) is provided with an oil sucker pipe A (11) perpendicular to its center, and the oil sucker pipe A (11) is connected to the inner wall and the outer wall of the extension sleeve (12); the inner wall of the outer sleeve (1) is provided with an oil sucker pipe B (13) distributed along its axis, and the oil sucker pipe B (13) is connected to the oil sucker pipe A (11); the outer surface of the outer sleeve (1) is also provided with an oil sucker port (14) connected to the oil sucker pipe B (13); in actual use, the oil sucker port (14) and the hole connecting the oil sucker pipe A (11) to the outer wall are both connected to the input end of the oil pump.

2. The hydraulic bearing device for processing the archway of a 20-roll mill according to claim 1, characterized in that, One end of the inner sleeve (4) is in contact with one end of the step (10), and the inner diameter of the step (10) is greater than the inner diameter of the inner sleeve (4) and less than the outer diameter of the inner sleeve (4).

3. The hydraulic bearing device for processing the archway of a 20-roll mill according to claim 1 or 2, characterized in that, A sealing ring (3) is provided between the other end of the outer sleeve (1) and the end cap (2).

4. The hydraulic bearing device for processing the archway of a 20-roll mill according to claim 3, characterized in that, The inner wall of the inner sleeve (4) is provided with a hydraulic oil flow channel (8), and an oil outlet (7) is provided in the hydraulic oil flow channel (8), which connects the inner wall and the outer wall of the inner sleeve (4).

5. The hydraulic bearing device for processing the archway of a 20-roll mill according to claim 4, characterized in that, The output end of the oil pump is connected to the oil storage tank, and the input end of the oil delivery pump is also connected to the oil storage tank. The oil storage tank can be replenished with lost oil as needed.

6. The hydraulic bearing device for processing the archway of a 20-roll mill according to claim 5, characterized in that, In actual operation, the lubricating oil input by high pressure passes between the outer sleeve (1) and the inner sleeve (4), between the inner sleeve (4) and the high-precision boring bar, and then seeps from the corresponding position at the end of the sleeve (4) that contacts the step (10), and concentrates at the annular groove B (9) formed between the high-precision boring bar and the step (10).

7. The hydraulic bearing device for processing the archway of a 20-roll mill according to claim 6, characterized in that, When actually installed on the 20-roll mill stand, there are two hydraulic bearing devices, which are respectively set between the openings on the high-precision wall plates installed at both ends of the 20-roll mill stand and the high-precision boring bars.

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