Induction heating rod with positioning device
By improving the structure of the induction heating rod, using cylinders and quadratures to connect and install positioning devices, the problem of uneven heating is solved, and the uniform heating of the rolls and the service life is improved.
Patent Information
- Application Number
- CN202422271703.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-18
AI Technical Summary
The existing square cylindrical induction heating rod cannot ensure uniform insertion position when heating the roll, resulting in uneven heat in the inner holes of the roll, which is prone to small cracks, affecting the service life and production efficiency of the roll.
An induction heating rod with positioning device is designed, connected by a cylinder and a tetragonal body, and a positioning piece and bolt nut are installed at the connection to ensure that the heating rod is positioned accurately in the inner hole of the roller shaft and achieve uniform heating.
It improves the heat-installation quality and service life of the roll, avoids the roll shaft cracking caused by uneven heating, and reduces production costs.
Smart Images
Figure CN223128912U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hot fitting of roll shafts, in particular to an induction heating rod with a positioning device used during hot fitting of roll shafts Background Art
[0002] The hot fitting technology of roll shafts or roll rings is an important process for the interference fit hot fitting of roll shafts of rolling mills or pipe reducing mills / sizing mills and other equipment before installation. That is, before hot fitting, an induction heating rod is used to heat the roll as a whole to expand the inner hole of the roll, and then the roll shaft is inserted. After cooling, the roll shaft is tightly and firmly fitted and can be installed and used. Therefore, the quality of hot-fitted roll shafts has a great impact on the subsequent use of the rolls. At present, the shape of the induction heating rod used for heating rolls is square-columnar, with a handle part at the upper part and an induction heating part at the lower part. During use, the square-columnar induction heating rod is manually inserted into the inner hole of the roll shaft to complete the heating process. Since the distance between the square-columnar induction heating rod and the circular inner hole surface of the roll is uneven, it is difficult to ensure the accurate insertion position each time. Therefore, it often occurs that the edges and corners of the square-columnar induction heating rod are in direct contact with the inner hole surface of the roll, resulting in uneven heating of the inner hole of the roll shaft, and excessive internal stress at the relative position of the inner hole of the roll shaft and the edges and corners of the heating rod, causing micro-cracks to occur locally. When the roll is working, rolling and sliding friction are generated between its working surface and the rolled material, and at the same time, it is subjected to alternating thermal stress, with serious wear and large consumption. Each time it is used, it needs to be processed and repaired. When it is used to the maximum hole shape, the roll skin is thinnest, and it is very easy to cause the entire roll to crack and fail. Especially when there are several rolls on the same stand, the failure of one roll affects the simultaneous failure of the rolls on the entire stand, bringing great economic losses to the enterprise Content of the Utility Model
[0003] The utility model finds out the reasons for the cracking and failure of the roll caused by the above-mentioned induction heating rod, and proposes a new technical solution for improving the existing structural design of the square-columnar induction heating rod. The improvement of the utility model makes the surface distance between the inner hole of the roll and the induction heating rod uniform, thereby heating the roll evenly, improving the hot-fitting quality and service life of the roll
[0004] An induction heating rod with a positioning device of the utility model is characterized in that the heating rod is composed of a cylinder connected to a cube and is equipped with a positioning device. Its heating part is the cylinder, and the handle part is the cube. The positioning device is installed at the connection between the cylinder and the cube; wherein, the length of the cylinder is greater than the length of the inner hole of the roll shaft
[0005] The features of the present utility model further lie in that the positioning device is composed of two positioning pieces and several bolt nuts. The upper part of the positioning piece is rectangular, and the lower part is trapezoidal. The two positioning pieces are respectively arranged in parallel on two sides of the cube. The trapezoidal part at the lower part is installed on the end face of the cylinder at the connection of the cylinder and the cube. The two positioning pieces are fixedly connected by several bolt nuts. The width of the rectangle at the upper part of the positioning piece is greater than the diameter of the inner hole of the roller shaft, the minimum width of the trapezoid at the lower part of the positioning piece is less than the diameter of the inner hole of the roller shaft, and the included angle of the hypotenuse of the trapezoid at the lower part of the positioning piece is 45°.
[0006] A further feature of the present utility model is that the center lines of the cylinder, the cube and the positioning device of the heating rod are on the same longitudinal center line. The center lines of the cylinder, the cube and the positioning device of the heating rod are on the same longitudinal center line as the center line of the inner hole of the roller shaft.
[0007] Through multiple trials and improvements to the structure of the induction heating rod, the present utility model makes the positioning of the induction heating rod in the inner hole of the roller shaft accurate, the heating uniform, and the use very convenient. It significantly improves the heating effect and service performance of the induction heating rod, effectively avoids the phenomenon of roller shaft cracking caused by uneven heating, improves the service life of the hot-fitted roller shaft, and saves production costs. Description of the Drawings
[0008] Figure 1 and Figure 2 are the structural schematic diagram and usage status of the existing square-column induction heating rod;
[0009] Figure 3 and Figure 4 are the structural schematic diagram and usage status of the induction heating rod of the present utility model;
[0010] Figure 5 is the exploded structure diagram of the positioning device 3 of the present utility model;
[0011] Figure 6 is the overall assembly structural schematic diagram of the present utility model.
[0012] Among them, the serial numbers represent: 1 is the induction heating cylinder, 2 is the operation handle cube, 3 is the positioning device, 4 is the inner hole of the roller shaft, and 5 is the bolt nut. Detailed Embodiments
[0013] The present utility model will be described in detail below with reference to the drawings and preferred exemplary embodiments. For the purpose of clearly illustrating the present utility model, the structural dimensions and regional ranges in the drawings may be enlarged or exaggerated, or some graphic structures may not be shown when clearly described in the text. However, the sizes of these preferred embodiments and structures do not limit the present utility model.
[0014] Referring to the attached Figures 1 to 6 , the present utility model designs and improves an induction heating rod with a positioning device. The induction heating rod is composed of a heating part cylinder 1 connected to a handle part cube 2, and a positioning device 3 is installed at the connection of the cylinder 1 and the cube 2. First, the square-column-shaped induction heating part of the induction heating rod is changed to a cylinder 1, and the length of the heating part cylinder 1 is greater than the length of the inner hole of the roller. The handle part remains in the shape of a cube 2 unchanged.
[0015] As Figure 5 and Figure 6 shown, the structural form of the positioning device 3 of the present utility model is composed of two positioning pieces and several bolts and nuts; the upper part of the positioning piece is rectangular, and the width of the rectangle is greater than the diameter of the inner hole 4 of the roll; the lower part of the positioning piece is trapezoidal, and the minimum width of the lower trapezoid is less than the diameter of the inner hole of the roll 4, and the included angle of the hypotenuse of the trapezoid is 45°. The two positioning pieces are respectively installed in parallel on both sides of the operation handle cube 2, and the minimum width part of the lower trapezoid of the positioning device 3 is installed on the end face of the cylinder 1 at the connection of the cylinder 1 and the cube 2, and then four bolts and nuts are used to fixedly connect the two positioning pieces of the positioning device 3 to both sides of the cube 2 and the end face of the cylinder 1.
[0016] As Figure 4 and Figure 6 shown, the center lines of the cylinder 1, the cube 2 and the positioning device 3 of the induction heating rod of the present utility model are on the same longitudinal center line, and the center lines of the cylinder 1, the cube 2 and the positioning device 3 of the induction heating rod are also on the same longitudinal center line as the center line of the inner hole of the roll, so that the induction heating rod can be at the same central position at the same time after being placed in the inner hole of the roll, making the distance between the surface of the inner hole of the roll and the heating rod uniform, and improving the efficiency of uniform heating of the roll.
[0017] During operation, the induction heating rod with a positioning device is inserted into the inner hole of the roll 4. The 4 points of the hypotenuse of the trapezoid of the two positioning pieces contact the upper end face of the inner hole of the roll to form a supporting surface. The induction heating rod is perpendicular to the center of the inner hole of the roll under its own gravity. After being placed in the inner hole of the roll, it can be fixed at the end face and the central position of the roll, making the distance between it and the surface of the inner hole of the roll uniform, forming uniform heating of the roll, avoiding the problem of roll cracking caused by uneven heating of the hot-mounted shaft after hot mounting the roll, improving the service life of the roll, ensuring the smooth progress of production, and reducing production costs.
[0018] Example 1
[0019] This embodiment is a specific example of the hot-mounted shaft of the sizing mill rolls in the Φ168 hot-rolled seamless steel tube unit. The main dimensions of the sizing rolls used in this unit are: maximum outer diameter Φ254mm, minimum outer diameter Φ200mm, inner hole diameter Φ90mm, and length 158mm. When hot-mounted originally, 50×50mm square-column-shaped induction heating rods were used, and there often occurred the phenomenon that the rolls cracked and failed during use due to tiny cracks.
[0020] Referring to the appendix Figures 1-6 , in this embodiment, an induction heating rod with a positioning device is adopted. The improved design is as follows: the heating part at the lower part of the heating rod is improved to a Φ72mm cylinder with a length of 170mm; a positioning device is installed on the end face of the cylinder 1 at the connection of the cylinder 1 and the square 2 of the induction heating rod; the upper rectangular width of the positioning piece of the positioning device is 105mm, the minimum lower trapezoidal width is 85mm, and the included angle of the trapezoidal hypotenuse is 45°; the upper rectangular height h1 of the positioning piece is 30mm, the lower trapezoidal height h2 is 50mm, and the two positioning pieces are installed in parallel on both sides of the square 2 of the heating rod on the end face of the heating part cylinder 1 and are fixedly connected through bolts and nuts 5.
[0021] When this embodiment is in use, the induction heating rod with a positioning device is inserted into the inner hole of the sizing roll. The 4 points of the trapezoidal hypotenuse of the two positioning pieces of the positioning device contact the upper end face of the inner hole of the sizing roll to form a supporting surface. The heating rod is perpendicular to the center of the inner hole under the action of its own gravity, and the distance from the surface of the heating rod to the inner hole surface of the sizing roll is evenly distributed, forming uniform heating of the sizing roll. Up to now, more than 300 sizing rolls have been heated in this embodiment. Since the inner hole of the sizing roll is heated evenly, the sizing roll is also evenly stressed after heating and mounting the shaft and cooling. The use effect is very remarkable. There is no roll cracking phenomenon after installation and use, ensuring the smooth progress of production, greatly improving the service life of the sizing mill rolls, thus improving production efficiency and reducing production costs.
[0022] The above is only the preferred embodiment of the present utility model. For those of ordinary skill in the art in this technical field, various improvements can be made without departing from the principle of the present utility model, and these improvements should also be regarded as the protection scope of the present utility model.
Claims
1. An induction heating rod with a positioning device, characterized in that, The heating rod is composed of a cylinder connected to a cuboid and is equipped with a positioning device. The heating part is the cylinder, and the handle part is the cuboid. The positioning device is installed at the connection between the cylinder and the cuboid; wherein, the length of the cylinder is greater than the length of the inner hole of the roller shaft.
2. The induction heating rod according to claim 1, wherein, The positioning device is composed of two positioning pieces and several bolts and nuts. The upper part of the positioning piece is rectangular, and the lower part is trapezoidal; the two positioning pieces are respectively arranged in parallel on both sides of the cuboid, and the lower trapezoidal part is installed on the end face of the cylinder at the connection between the cylinder and the cuboid. The two positioning pieces are fixedly connected by several bolts and nuts.
3. The induction heating rod according to claim 2, wherein, The width of the rectangle at the upper part of the positioning piece is greater than the diameter of the inner hole of the roller shaft, the minimum width of the trapezoid at the lower part of the positioning piece is less than the diameter of the inner hole of the roller shaft, and the included angle of the hypotenuse of the trapezoid at the lower part of the positioning piece is 45°.
4. The induction heating rod according to claim 1 or 2, characterized in that, The center lines of the cylinder, the cuboid and the positioning device of the heating rod are on the same longitudinal center line.
5. The induction heating rod according to claim 4, characterized in that, The center lines of the cylinder, the cuboid and the positioning device of the heating rod are on the same longitudinal center line as the center line of the inner hole of the roller shaft.