A flying shear support arm reinforcement device

Abstract

The utility model relates to a kind of flying shear supporting arm reinforcing device, the outer end of the supporting arm installed on flying shear box is fixedly connected with fixed seat, and the outer side of fixed seat is connected with the inner side of the upper and lower ends of long column through bolt.This utility model connects the distal end of the upper and lower supporting arms into an entity by flying shear supporting arm reinforcing device, and then forms a closed frame structure with flying shear box.Compared with the original cantilever beam structure, the stress direction of the welding seam connecting flying shear box and supporting arm is improved, the cracking problem of the welding seam is solved, and the firmness and stability are strengthened.

Description

Technical Field

[0001] This utility model relates to flying shear equipment in a high-speed wire rod production line for steel rolling, and particularly to a flying shear support arm reinforcement device. Background Technology

[0002] Flying shears are key pieces of equipment in high-speed wire rod mill production lines. A typical rolling line is equipped with at least three flying shears, and the flying shear in the roughing mill section, commonly known as the No. 1 flying shear, is located at the exit of the last roughing mill stand. This case study focuses on the No. 1 flying shear. Its primary functions are head and tail cutting and emergency breakage. Its structural form is a crank-rocker mechanism.

[0003] Crank-rocker type flying shear structure and operating principle (e.g.) Figure 1 and Figure 2 As shown, the upper and lower crankshafts 5 rotate synchronously clockwise and counterclockwise. One end of the upper and lower blade holders 4 is fitted onto the crankshafts 5, and the other end is connected to the rocker arm 3 via a pin 31. The fixed ends of the upper and lower rocker arms 3 are fixed to the upper and lower support arms 2 via pins. Shear blades 41 are mounted on the blade holders 4. During the shearing action, the crankshafts 5 rotate, driving the blade holders 4 to move until the upper and lower shear blades 41 overlap, cutting the rolled piece. The other end of the blade holder 4 swings with the rocker arm 3. Because there is a lead coefficient between the linear velocity of the shear blade 41 and the speed of the rolled piece, the ratio of the linear velocity of the shear blade 41 to the directional velocity of the rolled piece is called the lead coefficient. Especially during the breaking process, to achieve a breakage length that is not too long, the lead coefficient will be even larger. In this case, the rolled piece is almost always broken by pulling during the shearing process. Based on the force-bearing principle of the crank-rocker mechanism, the shearing force is transmitted to the support arm 2 through the tool holder 4 and the rocker arm 3. The support arm 2 is a cantilever beam structure, with its fixed end welded to the flying shear housing 1. Therefore, this weld often cracks due to excessive stress. When the workpiece temperature is too low or the material shape is too large, it also increases the shearing load on the flying shear, leading to the aforementioned cracking problem.

[0004] When the weld at the fixed end of support arm 2 cracks during the flying shear's shearing process, it directly leads to the support arm 2 detaching and equipment shutdown. The usual solution is to reassemble the detached support arm 2 and re-weld it, sometimes even adding reinforcing plates around it for added strength. Each repair takes at least four hours. While this temporarily solves the problem, it eventually recurs, especially since the weld of the lower support arm is often obscured by scale from the rolled workpiece, making it difficult to detect during routine inspections. Flying shear malfunctions and downtime directly impact the production line.

[0005] In short, the flying shear support arm detachment accident in the roughing rolling zone occurs several times a year, and the handling time is long, which has long restricted production and has not been completely resolved. Utility Model Content

[0006] To address the aforementioned technical problems, this utility model provides a flying shear support arm reinforcement device, which changes the cantilever beam characteristics of the support arm, improves the stress direction of the weld at the fixed end of the support arm, and solves the problems of weld cracking and production impact.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a flying shear support arm reinforcement device, comprising a fixed base and a column, wherein the outer end of the support arm installed on the upper and lower parts of the flying shear box is fixedly connected to the fixed base, and the outer side of the fixed base is connected to the inner sides of the upper and lower ends of the elongated column by bolts.

[0008] Furthermore, a boss is provided on the side of the fixing base.

[0009] Furthermore, the side of the column is provided with a groove corresponding to the boss.

[0010] Furthermore, the column body is provided with an inspection hole, the position of which corresponds to the pins at both ends of the rocker arm 3.

[0011] Furthermore, the diameter of the inspection hole is 10mm larger than the diameter of the pin.

[0012] This utility model connects the far ends of the upper and lower support arms into one unit through the flying shear support arm reinforcement device, and together with the flying shear box, it forms a closed frame structure. Compared with the original cantilever beam structure, the stress direction of the weld connecting the flying shear box and the support arm is improved, the problem of weld cracking is solved, and the firmness and stability are enhanced. Attached Figure Description

[0013] Figure 1 This is the front view of the flying shear structure; Figure 2 This is a side view of the flying shear structure; Figure 3 This is a front view of the flying shear structure of this utility model; Figure 4 This is a side view of the flying shear structure of this utility model; Figure 5 yes Figure 4 A magnified structural diagram at point A in the diagram.

[0014] In the diagram: 1. Flying shear box body, 2. Support arm, 3. Rocker arm, 31. Pin, 4. Blade holder, 41. Shear blade, 5. Crankshaft, 6. Fixing base, 61. Boss, 7. Bolt, 8. Column, 81. Groove, 82. Inspection hole. Detailed Implementation

[0015] The utility model mechanism will now be described in detail with reference to the accompanying drawings and embodiments. See also... Figures 3 to 5A flying shear support arm reinforcement device includes a fixed base 6 and a column 8. The outer ends of the support arms 2 mounted on the upper and lower parts of the flying shear housing 1 are fixedly connected to the fixed base 6. The outer side of the fixed base 6 is connected to the inner sides of the upper and lower ends of the elongated column 8 by bolts 7 (see...). Figure 3 and Figure 4 (As shown). The side of the fixing base 6 is provided with a boss 61, and the boss 61 corresponds to the groove 81 provided on the side of the column 8 (see...). Figure 4 and Figure 5 (As shown). The column 8 has four inspection holes 82, the positions of which correspond to the pins 31 at both ends of the rocker arm 3. The diameter of the inspection holes 82 is 10mm larger than the diameter of the pins 31 to facilitate the maintenance, replacement, and disassembly of the pins 31.

[0016] The fixed base 6 and the column 8 are connected by bolts 7, and the fixed base 6 is welded to the support arm 2. The boss 61 machined on the side of the fixed base 6 is engaged with the groove 81 on the side of the column 8. The column 8 has four inspection holes 82 in the middle, and the positions of the inspection holes 82 correspond to the pins 31 at both ends of the rocker arm 3. Example

[0017] In a steel company's high-speed wire rod production line, the flying shear in the roughing zone uses a crank-rocker mechanism. Its main functions are head and tail cutting and accidental breakage. As this equipment is a key piece of equipment on the line, it is used very frequently, with over 3000 cutting operations per day. The welds on the upper and lower support arms 2 and the flying shear housing 1 frequently detach, leading to accidents where the support arms 2 fall off. After improvements were made to the flying shear, a fixed base 6 was welded to the distal end of each of the upper and lower support arms 2. The two fixed bases 6 and the upper and lower ends of the column 8 are then connected by bolts 7, ensuring that the bosses 61 on the side of the fixed base 6 correspond to the grooves 81 on the side of the column 8. Four inspection holes 82, each 10mm larger than the diameter of the pins 31, are located in the middle section of the column 8, and their positions correspond to the pins 31 at both ends of the rocker arm 3.

[0018] During routine minor maintenance, the bearings inside the rocker arm 3 or the bearings in the tool holder 4 can be replaced through the four inspection holes 82. The bearings or pins 31 can then be removed.

[0019] If the flying shear needs to be disassembled for major repair, all bolts 7 can be removed, and the column 8 can be taken off. The fixing seat 6 has been welded to the support arm 2 as a whole and does not need to be cut off. It can be separated from the flying shear box 1 for inspection.

[0020] The flying shear support arm 2 reinforcement device provided by this utility model does not affect the various maintenance work of the original equipment, and achieves the purpose of reinforcement. After the modification, there have been no accidents of weld cracking or falling off of the support arm 2.

Claims

1. A flying shear support arm reinforcement device, characterized in that, The device includes a fixed base and a column. The outer ends of the support arms installed on the upper and lower parts of the flying shear box are fixedly connected to the fixed base. The outer side of the fixed base is connected to the inner sides of the upper and lower ends of the long column by bolts.

2. The flying shear support arm reinforcement device according to claim 1, characterized in that, The side of the mounting base is provided with a boss.

3. The flying shear support arm reinforcement device according to claim 1, characterized in that, The side of the column is provided with a groove corresponding to the boss.

4. The flying shear support arm reinforcement device according to claim 1, characterized in that, The column body is provided with an inspection hole, the position of which corresponds to the pins at both ends of the rocker arm.

5. The flying shear support arm reinforcement device according to claim 4, characterized in that, The diameter of the inspection hole is 10mm larger than the diameter of the pin.

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