Automatic guiding and centering protection sleeve for finishing mill roll ring installation

Abstract

The application discloses an automatic guiding and centering protective sleeve for the installation of a finishing mill roller ring, wherein the upper part of the protective sleeve body is a conical body, the lower part is a cylindrical body, the inner cavity of the cylindrical body is sequentially provided with a taper sleeve and a spline sleeve from bottom to top, the conical body is provided with a weight-removing through hole in the radial direction above the cylindrical body, the inner cavity of the conical body is sequentially provided with a shaft shoulder sleeve and a shaft head thread protective sleeve above the weight-removing through hole, the wall of the conical body is provided with a first cross hand hole in the radial direction at the position of the weight-removing through hole and a second cross hand hole in the radial direction at the position of the shaft head thread protective sleeve, and the first cross hand hole is 45 degrees out of phase with the second cross hand hole. The protective sleeve overcomes the defects in the manual installation process of the traditional roller ring, is simple to assemble, accurately guides, automatically centers, can quickly install the roller ring on the roller shaft, realizes the quick replacement of the roller ring, reduces the difficulty of replacement operation, improves the operation efficiency, effectively protects the roller shaft, and guarantees the installation precision of the roller ring.

Description

Technical Field

[0001] This invention relates to the field of steel rolling machinery technology, and in particular to an automatic guide centering protective sleeve for the installation of roll rings in finishing mills. Background Technology

[0002] In the process of high-speed wire rod rolling in steel plants, wire rod specifications are frequently changed according to production needs, and the finishing mill also requires corresponding replacement of roll rings. Manual replacement of various roll ring specifications is difficult due to alignment and misalignment during installation. This often results in the roll rings bumping against the roll shaft, causing damage to the shaft shoulders and mating surfaces, leading to defects such as protrusions, pits, and deformation. This severely compromises the fit accuracy of the roll shaft, further damaging the tapered sleeve mating surface. Ultimately, this prevents the roll rings from being properly installed, resulting in phenomena such as steel pulling, roll misalignment, and slippage during rolling, affecting the shape and surface quality of the wire rod and producing substandard products. Furthermore, damaged finishing mill roll shafts and tapered sleeves are difficult to repair, and replacement parts are costly. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an automatic guide and centering protective sleeve for the installation of roll rings in finishing mills. This protective sleeve overcomes the defects of the traditional manual installation process of roll rings. Its installation is simple, provides accurate guidance, and automatically centers the roll rings, which can quickly install the roll rings onto the roll shaft, realize the rapid replacement of roll rings, reduce the difficulty of replacement operations, improve work efficiency, effectively protect the roll shaft, and ensure the installation accuracy of the roll rings.

[0004] To solve the above technical problems, the present invention provides an automatic guide centering protective sleeve for the installation of rolling mill roll rings, comprising a protective sleeve body. The upper part of the protective sleeve body is conical and the lower part is cylindrical. The inner cavity of the cylindrical body consists of a tapered sleeve and a spline sleeve from bottom to top. The conical body has a de-weighting through hole radially above the cylindrical body. The inner cavity of the conical body is provided with a shoulder sleeve and a shaft head threaded protective sleeve above the de-weighting through hole. The wall of the conical body has a first cross-shaped hand hole radially at the position of the de-weighting through hole and a second cross-shaped hand hole radially at the position of the shaft head threaded protective sleeve. The first cross-shaped hand hole and the second cross-shaped hand hole are offset at a 45-degree angle.

[0005] Furthermore, the clearance between the inner wall of the protective sleeve body and the roller shaft is 0.15 to 0.20 mm.

[0006] Furthermore, the diameter of the first cross-shaped hand hole and the second cross-shaped hand hole is Ø25mm.

[0007] Furthermore, the length of the conical sleeve in the inner cavity of the cylindrical body is 1 mm less than the conical surface of the roll shaft. Because the automatic guide and centering protective sleeve for the installation of rolling mill roll rings in this invention adopts the above-mentioned technical solution, the upper part of the protective sleeve body is conical and the lower part is cylindrical. The inner cavity of the cylindrical body consists of a tapered sleeve and a splined sleeve from bottom to top. A de-weighting through hole is radially opened on the upper part of the conical body. Above the de-weighting through hole, a shoulder sleeve and a threaded protective sleeve are sequentially arranged on the inner cavity of the conical body. A first cross-shaped hand hole is radially provided on the wall of the conical body at the de-weighting through hole position, and a second cross-shaped hand hole is radially provided at the position of the threaded protective sleeve. The first and second cross-shaped hand holes are offset at a 45-degree angle. This protective sleeve overcomes the defects of the traditional manual installation process for rolling mill roll rings. Its assembly is simple, provides accurate guidance, and automatically centers, allowing for rapid installation of the roll ring onto the rolling mill shaft. This enables rapid replacement of the roll ring, reduces the difficulty of replacement operations, improves work efficiency, effectively protects the rolling mill shaft, and ensures the installation accuracy of the roll ring. Attached Figure Description

[0008] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the automatic guide centering protective sleeve for the installation of the roll ring of a finishing mill according to the present invention; Figure 2 for Figure 1 Top view. Detailed Implementation

[0009] Implementation, for example Figure 1 and Figure 2 As shown, the automatic guide centering protective sleeve for the installation of the roll ring of a finishing mill includes a protective sleeve body 1. The upper part of the protective sleeve body 1 is conical 11 and the lower part is cylindrical 12. The inner cavity of the cylindrical body 12 consists of a tapered sleeve 121 and a spline sleeve 122 from bottom to top. The conical body 11 has a weight-reducing through hole 111 radially above the cylindrical body 12. The weight-reducing through hole 111 is used to reduce the weight of the protective sleeve body and facilitate disassembly and assembly. The inner cavity of the conical body 11 is provided with a shoulder sleeve 112 and a shaft head threaded protective sleeve 113 above the weight-reducing through hole 111. The wall of the conical body 11 has a first cross-shaped hand hole 114 radially at the position of the weight-reducing through hole 111 and a second cross-shaped hand hole 115 radially at the position of the shaft head threaded protective sleeve 113. The first cross-shaped hand hole 114 and the second cross-shaped hand hole 115 are offset by a 45-degree angle.

[0010] Preferably, the fit clearance between the inner wall of the protective sleeve body 1 and the roller shaft is 0.15 to 0.20 mm.

[0011] Preferably, the diameter of the first cross hand hole 114 and the second cross hand hole 115 is Ø25mm.

[0012] Preferably, the length of the conical sleeve 121 inside the cylindrical body 12 is 1 mm less than the conical surface of the roll shaft.

[0013] Before installing the roller ring, first slip the tapered sleeve of the protective sleeve body onto the tapered surface of the roller shaft from the roller shaft end, ensuring that the tapered sleeve fits snugly against the tapered surface of the roller shaft. After releasing your hand, the protective sleeve body will automatically align and fit onto the roller shaft. At this time, the spline sleeve, shoulder sleeve, and threaded protective sleeve at the corresponding dimensional positions on the roller shaft will provide comprehensive protection for the roller shaft. Then, place the roller ring into the conical opening at the top of the protective sleeve body. Gently allow the roller ring to automatically align itself along the conical surface of the protective sleeve body under its own weight and slide into the installation position of the lower roller shaft, automatically aligning itself. Because the tapered surface of the roller shaft and the tapered sleeve of the protective sleeve body have the same taper, they provide excellent positioning. At this point, the roller ring will reach the required installation position. Hook your hand through the first or second cross-shaped hand hole and pull out the protective sleeve body to quickly complete the entire installation of the roller ring.

[0014] The protective sleeve body is made of ordinary carbon steel (Q235A or 45). Carbon steel protective sleeves are less hard than alloy steel roll shafts, making them less prone to damaging the roll shaft, and their manufacturing cost is lower. The protective sleeve body and the roll shaft are fitted with a clearance of 0.20mm for easy installation. Lathe machining ensures the smoothness and precision of the inner hole and surface. This protective sleeve provides all-around protection for the roll shaft. The inner hole dimensions of the protective sleeve are designed to match the roll shaft's external dimensions, protecting everything from the mating surface to the threaded portion at the shaft end. This protective sleeve is lightweight and easy to operate. The upper part of the protective sleeve body is designed with a tapered opening, smaller than the inner diameter of the roll ring, facilitating easy insertion of the roll ring at the tapered opening. The first and second cross-shaped hand holes allow for easy removal of the protective sleeve by hand or tools. This also reduces the weight of the protective sleeve body, making it easy to easily insert or remove the protective sleeve from the roll shaft for roll ring replacement. The tapered sleeve at the bottom of the protective sleeve body is designed to be 1mm shorter than the tapered surface of the roll shaft, allowing the protective sleeve to adhere tightly to the tapered surface of the roll shaft under its own weight, preventing wobbling. The protective sleeve body is fitted onto the outside of the roll shaft to protect the roll shaft surface, shoulder, and threaded part of the shaft head. The roll ring is then fitted onto the protective sleeve body. After the roll ring is in place, the protective sleeve body is removed, completing the installation of the roll ring. The inner hole of the roll ring and the protective sleeve body are clearance fit (0.15-0.20mm), so there will be no interference.

[0015] The upper part of this protective sleeve is conical and the lower part is cylindrical. The inner hole of the protective sleeve body is designed in a stepped shape according to the roller shaft to better fit and position with the roller shaft surface. The first cross hand hole is the sleeve removal hole and the second cross hand hole is the weight removal hole to reduce the weight of the protective sleeve body and facilitate easy disassembly and assembly of the protective sleeve.

[0016] The application of this protective sleeve effectively reduces spare parts consumption. The cost of a roller ring spare part is 4500 yuan / piece, and the cost of a roller shaft spare part is 12000 yuan / piece. Based on a monthly consumption of 10 roller rings and 2 damaged roller shafts, the monthly spare parts consumption cost Y = 10 × 4500 + 2 × 12000 = 69000 yuan. Therefore, at least 828,000 yuan in spare parts consumption costs can be reduced annually. Simultaneously, it prevents damage to the appearance quality of the wire, reducing losses from defective products. It also reduces the difficulty of roller ring installation and saves installation time. In the fast-paced production of wire, replacing one pair of roller rings saves 5 minutes, and replacing 10 pairs of roller rings saves 50 minutes. By saving time on roller ring replacement, production efficiency is improved and labor intensity is reduced.

Claims

1. An automatic guide and centering protective sleeve for installing roll rings in a finishing mill, comprising a protective sleeve body, characterized in that: The protective sleeve body has a conical upper part and a cylindrical lower part. The protective sleeve body is made of Q235A or 45# steel with a hardness lower than that of the alloy steel material of the roll shaft. The inner cavity of the cylindrical body consists of a tapered sleeve and a spline sleeve from bottom to top. The tapered body has a de-weighting through hole radially above the cylindrical body. The inner cavity of the tapered body has a shoulder sleeve and a threaded protective sleeve above the de-weighting through hole. The tapered sleeve fits against the tapered surface of the roll shaft. The spline sleeve, shoulder sleeve, and threaded protective sleeve are positioned at the corresponding dimensional positions of the roll shaft, providing comprehensive protection for the roll shaft. The tapered surface of the roll shaft has the same taper as the tapered sleeve of the protective sleeve body. The wall of the tapered body has a first cross-shaped hand hole radially at the de-weighting through hole and a second cross-shaped hand hole radially at the threaded protective sleeve position. The first cross-shaped hand hole and the second cross-shaped hand hole are offset at a 45-degree angle. The length of the tapered sleeve in the inner cavity of the cylindrical body is 1 mm less than the tapered surface of the roll shaft.

2. The automatic guide centering protective sleeve for installing the roll ring of a finishing mill as described in claim 1, characterized in that: The clearance between the inner wall of the protective sleeve body and the roller shaft is 0.15 to 0.20 mm.

3. The automatic guide centering protective sleeve for installing the roll ring of a finishing mill according to claim 1 or 2, characterized in that: The diameter of the first cross-shaped hand hole and the second cross-shaped hand hole is Ø25mm.

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