An online repair method for wear on the active end of a coiler for a coiling furnace of a Steckel rolling mill

Abstract

The present invention relates to an online repair method for the wear of the active end of a coiler for a coiling furnace of a furnace coiling mill, comprising a repair plate, and the online repair method is as follows: (1) making a repair plate, the repair plate is provided with an arc groove, the inner diameter of the arc groove is adapted to the outer diameter of a mandrel, a first clamping groove is provided in the arc groove of the repair plate, the size of the first clamping groove is adapted to the size of a positioning key on the mandrel after wear; (2) installing, after the first clamping groove of the repair plate is clamped on the positioning key on the mandrel, the repair plate is fixed on the active flange. The present invention solves the technical problem that the mandrel cannot drive the coiler body to rotate smoothly in the circumferential direction after wear.

Description

Technical Field

[0001] The invention relates to an online repair method for wear on the active end of a coiler for a coiling furnace of a Steckel mill, and belongs to the technical field of hot rolling equipment. Background Art

[0002] Steckel mill is a steel plate rolling mill. The main rolling mill of the Steckel mill is equipped with furnace coiling machines before and after. During the rolling process of the steel plate, when the steel plate reaches the required thickness, the steel plate is rolled on the coil body of the furnace coiling machine for insulation to reduce the temperature drop rate of the steel plate during rolling. The coil body used for coiling the steel plate is driven to rotate by the mandrel. The coil body includes a movable end and a fixed end. The fixed end of the coil body is fixed to the mandrel. Since the coil body works in a high temperature environment of 950-1000℃, when the coil body and the mandrel are stretched after heating or contracted by cooling, pulling deformation will occur between the coil body and the mandrel. In order to eliminate the influence of thermal expansion and contraction on the coil body and the mandrel, the movable end of the coil body is usually connected to the mandrel through a positioning key. However, when the drum body of the winding machine encounters a large impact during the process of curling the steel plate, or when curling the steel plate under high load, unbalanced force or torque will be generated, and the thermal expansion and contraction will cause the drum body and the core shaft to produce telescopic movement along the axial direction, which will eventually cause wear between the flange and the locating key at the movable end of the drum body. When the wear of the flange or locating key reaches a certain extent, the core shaft drives the drum body to rotate in the circumferential direction, and relative movement will occur between the drum body and the core shaft. Ultimately, the core shaft cannot smoothly drive the drum body to rotate, affecting the normal operation of the winding machine.

[0003] At present, the repair method of shutdown replacement is adopted. This repair method requires the equipment to be shut down and offline first, and then wait for the equipment to cool down, and then remove the worn flange and / or locating key from the roll body and the mandrel of the furnace coil rolling mill, and finally install the new flange and / or locating key. The repair method of shutdown replacement takes a long time to repair, which seriously affects the production progress. Summary of the invention

[0004] The purpose of the present invention is to provide a new technical solution to improve or solve the technical problems existing in the prior art as described above.

[0005] The technical solution provided by the present invention is as follows: an online repair method for the wear of the active end of a coiler for a coiling furnace of a furnace coiling mill, comprising a coiler body and a mandrel, the mandrel passing through the coiler body and arranged on the axis of the coiler body, the coiler body comprising a fixed end and a movable end, the fixed end of the coiler body is provided with a welding flange fixedly connected to the mandrel, the movable end of the coiler body is provided with a movable flange, a positioning key is provided on one end of the mandrel close to the movable flange, a second slot is provided on the movable flange, the movable flange is connected with the positioning key on the mandrel through the second slot, and also comprises a repair plate, and the method for online repairing the coil of the furnace coil mill using the repair plate is as follows:

[0006] (1) manufacturing a repair plate, wherein an arc-shaped groove is formed on the repair plate, the inner diameter of the arc-shaped groove is matched with the outer diameter of the core shaft, and a first clamping groove is formed in the arc-shaped groove of the repair plate, the size of the first clamping groove is matched with the size of the positioning key on the core shaft after being worn;

[0007] (2) Installation: After the first slot of the repair plate is clamped on the positioning key on the core shaft, the repair plate is fixed on the movable flange.

[0008] Furthermore, the repair plate is arc-shaped, fan-shaped or square.

[0009] Furthermore, in step (1), two repair plates are manufactured, and the two repair plates are connected end to end to form a circular ring which is externally mounted on the core shaft.

[0010] Furthermore, the repair plate is made of 40 chrome steel or stainless steel.

[0011] Furthermore, both ends of the core shaft are supported by bearing seats.

[0012] Furthermore, the thickness of the repair plate is 60 mm to 200 mm.

[0013] Furthermore, the number of the positioning keys is two, and the two positioning keys are symmetrically arranged along the radial direction of the core shaft and about the axis of the core shaft.

[0014] Furthermore, the repair plate is fixed to the movable flange by welding.

[0015] The beneficial effect of the present invention is that when wear occurs between the flange at the movable end of the reel body and the positioning key, a gap will appear between the positioning key on the core shaft and the second slot of the movable flange. When the core shaft drives the reel body to rotate in the circumferential direction, relative movement will occur between the reel body and the core shaft, that is, the key connection between the reel and the core shaft becomes loose, and the core shaft cannot continue to drive the reel body to rotate smoothly. By adopting the repair method of the present invention, the repair plate is fixed on the movable flange, and the first slot on the repair plate is connected to the positioning key of the core shaft, thereby eliminating the matching clearance between the core shaft and the movable flange caused by wear. The repair plate has the effect of preventing the positioning key from loosening with the movable flange. There is no need to disassemble and repair, but the repair can be completed online during the idle period of equipment shutdown, overcoming the relative movement problem caused by wear between the reel body and the core shaft of the reel machine along the circumferential rotation, so that the core shaft can continue to drive the reel body to rotate smoothly, improve the repair efficiency, shorten the repair time, and save the operation and repair costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the cooperation between the mandrel and the reel of the present invention;

[0017] Figure 2 It is a structural schematic diagram of the installation of the movable flange and the welding flange of the present invention;

[0018] Figure 3 For the present invention Figure 2 A-direction projection view;

[0019] Figure 4 For the present invention Figure 3 The enlarged structural diagram at E in FIG.

[0020] Figure 5 It is a structural schematic diagram of the repair plate of the present invention;

[0021] Figure 6 It is a structural schematic diagram of the repair of the repair plate of the present invention;

[0022] Figure 7 For the present invention Figure 6 A front view of

[0023] Figure 8 For the present invention Figure 7 Right view of;

[0024] Fig. 9 For the present invention Figure 8 A schematic diagram of the structure at F of FIG.

[0025] Fig.10 It is a structural schematic diagram of a specific embodiment 2 of the present invention;

[0026] Fig.11It is a structural schematic diagram of a repair plate according to a second specific embodiment of the present invention;

[0027] Fig.12 It is a structural schematic diagram of a specific embodiment 3 of the present invention;

[0028] In the figure, 1, drum body; 101, first flange mounting part; 1011, welding flange; 102, second flange mounting part; 1021, movable flange; 2, core shaft; 3, positioning key; 4, repair plate; 401, arc groove; 402, first slot; 403, second slot; 5, bearing seat support. DETAILED DESCRIPTION

[0029] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention. Specific embodiment one:

[0031] like Figures 1 to 9 As shown, specific embodiment 1 discloses an online repair method for the wear of the movable end of a coiling machine for a coil rolling furnace of a furnace coil rolling mill, comprising a coil body 1 and a mandrel 2, the mandrel 2 passes through the coil body 1 and is arranged on the axis of the coil body 1, the coil body 1 comprises a fixed end and a movable end, the fixed end of the coil body 1 is provided with a welding flange 1011 fixedly connected to the mandrel 2, the movable end of the coil body 1 is provided with a movable flange 1021, a positioning key 3 is provided on the end of the mandrel 2 close to the movable flange 1021, a second slot 403 is provided on the movable flange 1021, the movable flange 1021 is connected with the positioning key 3 on the mandrel 2 through the second slot 403, more specifically, as Figures 1 to 3As shown, the fixed end of the reel body 1 is provided with a first flange mounting portion 101, and the movable end of the reel body 1 is provided with a second flange mounting portion 102. A welding flange 1011 is connected to the first flange mounting portion 101 of the reel body 1 by bolts, and a through hole is provided in the center of the welding flange 1011 for the core shaft 2 to pass through. The welding flange 1011 is sleeved on the core shaft 2 and connected to the core shaft 2 by welding; a keyway is provided at the other end of the core shaft 2, and the number of the keyways can be one or more. In the present embodiment, the number of the keyways is two, and the two keyways are symmetrically arranged along the radial direction of the core shaft 2 and about the axis of the core shaft 2. A positioning key 3 is installed in the keyway, and a movable flange 1021 is fixed to the second flange mounting portion 102 of the reel body 1, and a through hole is provided in the center of the movable flange 1021. The side wall of the through hole is provided with a second card slot 403 that matches the number of the positioning keys 3. In the present embodiment, the number of the second card slot 403 is two, and the movable flange 1021 sleeves After being connected to the core shaft 2, the second slot 403 of the movable flange 1021 is clamped on the positioning key 3 of the core shaft 2; the movable end of the roll body 1 is positioned by the positioning key 3 and the second slot 403, which not only enables the core shaft 2 to drive the roll body 1 to rotate in the circumferential direction, but also when the roll body 1 or the core shaft 2 is heated and elongated, no pulling phenomenon will occur between the roll body 1 and the core shaft 2; however, when the roll body 1 of the roll machine encounters a large impact during the process of curling the steel plate, or under high load When curling the steel plate, an unbalanced force or moment will be generated, and the thermal expansion and contraction will cause the reel body 1 and the core shaft 2 to produce telescopic movement along the axial direction, which will eventually cause wear between the movable flange 1021 and the positioning key 3 at the movable end of the reel body. When the wear of the movable flange 1021 or the positioning key 2 reaches a certain extent, the core shaft 2 drives the reel body 1 to rotate in the circumferential direction, and relative movement will occur between the reel body 1 and the core shaft 2. Finally, the core shaft 2 cannot smoothly drive the reel body 1 to rotate, affecting the normal operation of the reel machine.

[0032] like Figure 5 As shown, the online repair method for the wear of the active end of the coiler for the coiling furnace of the Steckel rolling mill also includes a repair plate 4, and the online repair method is as follows:

[0033] (1) manufacturing a repair plate 4, wherein an arc-shaped groove 401 is provided on the repair plate 4, wherein the inner diameter of the arc-shaped groove 401 is adapted to the outer diameter of the core shaft 2, and a first clamping groove 402 is provided in the arc-shaped groove 401 of the repair plate 4, wherein the size of the first clamping groove 402 is adapted to the size of the worn positioning key 3 on the core shaft 2;

[0034] (2) Installation: After the first slot 402 of the repair plate 4 is clamped on the positioning key 3 on the mandrel 2, the repair plate 4 is fixed to the movable flange 1021. The method of fixing the repair plate 4 to the movable flange 1021 can be selected according to the working conditions, preferably by welding, of course, it can also be fixed by bolts, or by interference fit and the like.

[0035] It should be noted that the present invention is an online repair performed when the active end of the coiling furnace of the Steckel Mill is worn. When the wear occurs, the size of the positioning key 3 of the mandrel 2 will become smaller or / and the size of the second slot 403 of the movable flange 1021 will become larger, and a matching gap will appear between the positioning key 3 on the mandrel 2 and the second slot 403 of the movable flange 1021 (such as Figure 4 As shown in the figure, when the core shaft 2 drives the roll body 1 to rotate in the circumferential direction, relative movement occurs between the roll body 1 and the core shaft 2. The size of the first slot 402 opened in the arc groove 401 of the repair plate 4 in the above-mentioned step (1) is adapted to the size of the positioning key 3 on the core shaft 2 after wear.

[0036] In addition, in the present embodiment, the repair plate 4 is in an arc shape. Of course, the repair plate 4 may also be in other shapes, such as a sector shape or a square shape.

[0037] The repair plate 4 is made of 40 chrome steel, which is one of the most widely used alloy structural steels in the machinery manufacturing industry, and has good properties such as wear resistance, chemical corrosion resistance, tear resistance, high load-bearing and shock absorption. The thickness of the repair plate 4 is 60 mm to 200 mm, preferably 90 mm. Of course, other materials, such as stainless steel, can also be used to make the repair plate 4. For ordinary technicians in this field, the material of the repair plate 4 can be selected according to specific working conditions.

[0038] By adopting the repair method of the present invention, the first slot 402 on the repair plate 4 is engaged with the positioning key 3 on the mandrel 2, and then the repair plate 4 is fixed on the movable flange 1021, thereby eliminating the matching gap (such as the gap between the mandrel 2 and the movable flange 1021) caused by wear. Fig. 9 As shown in the figure, the repair method of the present invention can be completed online during the idle period of equipment shutdown, which overcomes the relative movement problem caused by wear between the reel body 1 and the core shaft 2 of the reel machine along the circumferential rotation, so that the core shaft 2 can continue to drive the reel body 1 to rotate smoothly, thereby improving the repair efficiency, shortening the repair time, and saving the operation and repair costs. Specific embodiment 2:

[0040] like Fig.10 and 11As shown, different from the specific embodiment 1, two arc-shaped repair plates 4 are made, and the two arc-shaped repair plates 4 are connected end to end to form a ring that is outer-mounted on the core shaft 2. The two repair plates 4 can increase the axial connection strength between the roll body 1 and the core shaft 2. Specific embodiment three:

[0042] like Fig.12 As shown, different from the specific embodiment 1, the two ends of the core shaft 2 are supported by bearing seats 5, which can ensure the smooth rotation of the core shaft 2.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An online repair method for the wear of the movable end of a coiling machine for a coiling furnace of a furnace coil rolling mill, comprising a coiling body (1) and a mandrel (2), wherein the mandrel (2) passes through the coiling body (1) and is arranged on the axis of the coiling body (1), the coiling body (1) comprises a fixed end and a movable end, the fixed end of the coiling body (1) is provided with a welding flange (1011) fixedly connected to the mandrel (2), the movable end of the coiling body (1) is provided with a movable flange (1021), a positioning key (3) is provided on one end of the mandrel (2) close to the movable flange (1021), a second groove (403) is provided on the movable flange (1021), and the movable flange (1021) is connected to the positioning key (3) on the mandrel (2) through the second groove (403), It is characterized in that It also includes a repair plate (4), which performs online repair when the movable end of the coiling furnace of the Steckel rolling mill is worn. When the wear occurs, the size of the positioning key (3) of the mandrel (2) will become smaller or / and the size of the second clamping groove (403) of the movable flange (1021) will become larger, and a matching gap will appear between the positioning key (3) on the mandrel (2) and the second clamping groove (403) of the movable flange (1021). When the mandrel (2) drives the roll body (1) to rotate in the circumferential direction, relative movement will occur between the roll body (1) and the mandrel (2). The online repair method is as follows: (1) manufacturing a repair plate (4), wherein an arc-shaped groove (401) is provided on the repair plate (4), wherein the inner diameter of the arc-shaped groove (401) is matched with the outer diameter of the core shaft (2), and a first clamping groove (402) is provided in the arc-shaped groove (401) of the repair plate (4), wherein the size of the first clamping groove (402) is matched with the size of the positioning key (3) on the core shaft (2) after being worn; (2) Installation, after the first slot (402) of the repair plate (4) is clamped on the positioning key (3) on the core shaft (2), the repair plate (4) is fixed on the movable flange (1021); The repair plate (4) is fixed to the movable flange (1021) by welding.

2. The online repair method for wear of the active end of the coiler for the coiling furnace of the Steckel mill according to claim 1, It is characterized in that The repair plate (4) is arc-shaped, fan-shaped or square-shaped.

3. The online repair method for wear of the active end of the coiler for the coiling furnace of the Steckel mill according to claim 2, It is characterized in that In step (1), two repair plates (4) are manufactured. The two repair plates (4) are connected end to end to form a circular ring which is externally mounted on the core shaft (2).

4. The online repair method for wear of the active end of the coiler for the coiling furnace of the Steckel mill according to any one of claims 1 to 3, It is characterized in that The repair plate (4) is made of 40 chrome steel or stainless steel.

5. The online repair method for wear of the active end of the coiler for the coiling furnace of the Steckel mill according to claim 4, It is characterized in that Both ends of the core shaft (2) are supported by bearing seats (5).

6. The online repair method for wear of the active end of the coiler for the coiling furnace of the Steckel mill according to claim 1, It is characterized in that The thickness of the repair plate (4) is 60 mm to 200 mm.

7. The online repair method for wear of the active end of the coiler for the coiling furnace of the Steckel mill according to claim 1, It is characterized in that The number of the positioning keys (3) is two, and the two positioning keys (3) are symmetrically arranged along the radial direction of the core shaft (2) and about the axis of the core shaft (2).

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