Crank connecting rod flying shear arm fixing mechanism and flying shear

Abstract

The utility model discloses a crank connecting rod flying shear arm fixing mechanism, and belongs to the technical field of flying shears. Comprising a tool arm, an eccentric shaft and an expansion sleeve. Wherein the tool arm serves as a key bearing part of the flying shear, a tool arm hole is defined in the tool arm, the eccentric shaft penetrates through the tool arm hole, and the tool arm is connected with the eccentric shaft through matching of the tool arm hole and the eccentric shaft. Furthermore, a gap is formed between the eccentric shaft and the tool arm hole, and an expansion sleeve is arranged in the gap between the eccentric shaft and the tool arm hole. The expansion sleeve can generate radial expansion by screwing a bolt of the expansion sleeve, so that the expansion sleeve inwards holds the eccentric shaft tightly and meanwhile outwards abuts against the inner wall of the tool arm hole tightly. The tool arm and the eccentric shaft are tightly and stably connected through the two-way enclasping and jacking effects. The problem that the gap between the cutting edges becomes large due to displacement of the eccentric shaft is solved, it is ensured that the flying shear can always keep the high-precision shearing effect in the production process, and the production efficiency and the product quality are improved.

Description

Technical Field

[0001] This application relates to the field of flying shear technology, and in particular to a crank-connecting rod flying shear arm fixing mechanism and a flying shear machine. Background Technology

[0002] In industrial production, flying shears play a crucial role as key equipment on the production line. They are primarily responsible for cutting the beginning and end of the rolled material, as well as for emergency breakage in case of unforeseen circumstances, ensuring smooth production processes and product quality.

[0003] In existing crank-connected flying shear structures, the adjustment mechanism for the shear blade gap mainly relies on the eccentric shafts of the two connecting rods. By adjusting the position of the eccentric shafts, the gap between the shear blades can be controlled to adapt to the shearing requirements of different specifications of rolled materials. Referring to Figure 1, the existing technology typically uses an open sleeve on the cutter arm secured with two M16 bolts. This fixing method, to a certain extent, achieves a stable connection between the cutter arm and the eccentric shaft, ensuring the operating accuracy of the flying shear under normal working conditions.

[0004] However, in actual production, flying shears face extremely harsh working conditions. Due to the frequent need to cut the head, tail, and shred, each component of the flying shear bears enormous dynamic loads. The lower blade arm, in particular, with its blade in a forward position, experiences a strong backward force during shearing. The clamping force of the existing shear sleeve is insufficient to resist this frequent and powerful reverse force, and the M16 bolts used also fail to meet the strength requirements of actual working conditions. These structural deficiencies easily lead to the breakage of the shear sleeve's fastening bolts, causing displacement of the eccentric shaft, which in turn leads to a gradual increase in the shear blade gap, significantly negatively impacting production efficiency and product quality. Summary of the Invention

[0005] The purpose of this application is to provide a crank-connecting rod scissor arm fixing mechanism to solve the problem of unstable fixing of the scissor arm and eccentric shaft in the prior art.

[0006] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0007] On the one hand, this application provides a crank connecting rod flying scissor arm fixing mechanism, including: a cutter arm, wherein the cutter arm defines a cutter arm outlet hole;

[0008] An eccentric shaft passes through the cutter arm hole, and there is a gap between the eccentric shaft and the cutter arm hole;

[0009] An expansion sleeve is disposed in the gap between the eccentric shaft and the cutter arm hole. By tightening the bolts of the expansion sleeve, the expansion sleeve can be made to tighten the eccentric shaft and the cutter arm.

[0010] In this design, the cutter arm serves as the load-bearing component of the flying shear, with a cutter arm hole defined on its upper part. This hole mates with the eccentric shaft, connecting the cutter arm and the eccentric shaft. An expansion sleeve is installed between the eccentric shaft and the cutter arm. By tightening the bolts of the expansion sleeve, it expands radially, thus gripping the eccentric shaft inwards and simultaneously pressing against the inner wall of the cutter arm hole outwards. This bidirectional gripping and pressing action ensures a stable connection between the cutter arm and the eccentric shaft. Compared to the existing method of using an open sleeve with two M16 bolts to lock the cutter arm and eccentric shaft, the locking torque of the expansion sleeve is significantly greater than that of two M16 bolts, effectively preventing displacement of the eccentric shaft during production. Because the eccentric shaft position is stable, the blade clearance remains within a suitable range, avoiding the problem of increased blade clearance due to eccentric shaft displacement. This ensures that the flying shear maintains high-precision cutting performance throughout production, improving production efficiency and product quality.

[0011] Optionally, a stop is also included, which is connected to the cutter arm and the eccentric shaft respectively, and the stop is used to restrict the relative rotation of the cutter arm and the eccentric shaft.

[0012] To further enhance the stability of the connection between the cutter arm and the eccentric shaft, this solution also includes a stop. The stop is connected to both the cutter arm and the eccentric shaft to restrict their relative rotation, ensuring that they remain relatively stationary during operation. This prevents the eccentric shaft from shifting due to relative rotation during frequent head-cutting, tail-cutting, and fragmentation tasks.

[0013] Optionally, the stop includes an outer cover disposed at the axial end of the eccentric shaft and a stop disc disposed on the cutter arm, the outer cover being connected to the stop disc.

[0014] Optionally, the outer periphery of the outer cover has an external spline, and the stop disc has an internal spline that mates with the external spline.

[0015] In this design, the stop components include an outer cover located at the axial end of the eccentric shaft and a stop disc mounted on the cutter arm. Specifically, the outer cover has external splines on its outer circumference, and the stop disc has internal splines that mate with the external splines. During installation, the stop disc is fitted onto the outer circumference of the outer cover, and the connection between the outer cover and the stop disc is achieved through the engagement of the external and internal splines. This spline connection method not only provides high connection strength and the ability to withstand large torques, but also facilitates installation and disassembly, making equipment maintenance and repair easier.

[0016] Optionally, the head of the bolt of the expansion sleeve is located on the side of the expansion sleeve closer to the stop plate.

[0017] Optionally, the vertical projection of the bolt of the expansion sleeve on the stop member is located inside the stop disc.

[0018] Optionally, the stop disc is detachably connected to the cutter arm by bolts.

[0019] In this design, the head of the bolt of the expansion sleeve is located on the side of the expansion sleeve closer to the stop plate. Furthermore, the vertical projection of the bolt on the stop plate is located within the stop plate. When tightening or disassembling the expansion sleeve is required, simply removing the stop plate provides sufficient operating space for tightening the bolt, greatly improving the convenience and feasibility of the operation.

[0020] On the other hand, this application provides a flying shear machine, which includes the aforementioned crank-connecting rod flying shear arm fixing mechanism.

[0021] Compared with existing technologies, the beneficial effects achieved by this application are as follows: This application incorporates an expansion sleeve between the cutter arm hole and the eccentric shaft. By tightening the bolts of the expansion sleeve, radial expansion occurs, causing the sleeve to grip the eccentric shaft inwards while simultaneously pressing against the inner wall of the cutter arm hole outwards. This bidirectional gripping and pressing action ensures a stable connection between the cutter arm and the eccentric shaft. Compared to existing methods that use an open sleeve with two M16 bolts to lock the cutter arm and eccentric shaft, the locking torque of the expansion sleeve in this application is significantly greater than that of the two M16 bolts, effectively preventing displacement of the eccentric shaft during production. This avoids the problem of increased blade clearance caused by eccentric shaft displacement, thus ensuring that the flying shear maintains high-precision cutting performance throughout production, improving production efficiency and product quality. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the crank-connecting rod fly scissor arm and eccentric shaft fixing structure in the prior art provided in this application;

[0024] Figure 2 This is a schematic diagram of the overall structure of some embodiments provided in this application.

[0025] Explanation of reference numerals in the attached diagram: 1-Cutter arm; 2-Eccentric shaft; 3-Expansion sleeve; 4-Stop; 11-Cutter arm hole; 41-Outer cover; 42-Stop plate. Detailed Implementation

[0026] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure / application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use.

[0027] Example 1

[0028] This embodiment describes a crank-connecting rod scissor arm fixing mechanism, referencing... Figure 1 and Figure 2 The crank-connecting rod flying shear arm fixing mechanism in this embodiment includes a blade arm 1, an eccentric shaft 2, and an expansion sleeve 3. The blade arm 1, as a key load-bearing component of the flying shear, defines a blade arm hole 11 on its upper part. The eccentric shaft 2 passes through the blade arm hole 11, and the connection between the blade arm 1 and the eccentric shaft 2 is achieved through the engagement of the blade arm hole 11 and the eccentric shaft 2. Furthermore, there is a gap between the eccentric shaft 2 and the blade arm hole 11, and an expansion sleeve 3 is disposed in this gap. In this embodiment, the expansion sleeve 3 is a KTR 400 expansion sleeve 3. By tightening the bolts of the expansion sleeve 3, radial expansion occurs, causing it to grip the eccentric shaft 2 inwards and simultaneously press against the inner wall of the blade arm hole 11 outwards. This bidirectional gripping and pressing action achieves a tight and stable connection between the blade arm and the eccentric shaft 2.

[0029] Compared to the existing method of using an open sleeve and two M16 bolts to lock the cutter arm and eccentric shaft 2, the locking torque of the expansion sleeve 3 in this embodiment can reach 20400 Nm, which is far greater than the locking torque of two M16 bolts. This effectively prevents the eccentric shaft 2 from shifting during production. Because the eccentric shaft 2 is in a stable position, the blade clearance can always be kept within a suitable range, avoiding the problem of increased blade clearance caused by the displacement of the eccentric shaft 2. This ensures that the flying shear maintains a high-precision cutting effect throughout the production process, improving production efficiency and product quality.

[0030] Example 2:

[0031] Based on the same inventive concept as Embodiment 1, refer to Figure 2 To further enhance the stability of the connection between the cutter arm and the eccentric shaft 2, the crank-connecting rod flying scissor arm fixing mechanism in this embodiment also includes a stop 4. The stop 4 is connected to both the cutter arm and the eccentric shaft 2, and is used to restrict the relative rotation of the cutter arm 1 and the eccentric shaft 2, ensuring that the two remain relatively stationary during operation, thereby avoiding the problem of displacement of the eccentric shaft 2 caused by the relative rotation of the cutter arm 1 and the eccentric shaft 2 during frequent head cutting, tail cutting, and fragmentation tasks.

[0032] Specifically, the stop component 4 includes an outer cover 41 detachably connected to the axial end of the eccentric shaft 2 by bolts, and a stop disc 42 detachably connected to the tool arm by bolts. Further, the outer cover 41 has external splines on its outer periphery, and the stop disc 42 has internal splines that mate with the external splines. During installation, the stop disc 42 is fitted onto the outer periphery of the outer cover 41, and the connection between the outer cover 41 and the stop disc 42 is achieved through the engagement of the external and internal splines. This spline connection not only provides high connection strength and the ability to withstand large torques, but also facilitates installation and disassembly, making equipment maintenance and repair easier.

[0033] In this embodiment, the axial length of the expansion sleeve 3 is less than the axial length of the cutter arm hole 11, and the head of the bolt of the expansion sleeve 3 is located on the side of the expansion sleeve 3 closer to the stop plate 42. Furthermore, the vertical projection of the bolt of the expansion sleeve 3 onto the stop member 4 is located within the stop plate 42. When it is necessary to tighten or disassemble the expansion sleeve 3, simply removing the stop plate 42 provides sufficient operating space for tightening the bolt of the expansion sleeve 3, greatly improving the convenience and feasibility of the operation.

[0034] Example 3:

[0035] This embodiment provides a flying shear machine, including the crank-connecting rod flying shear arm fixing mechanism of Embodiment 1 or Embodiment 2.

[0036] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this disclosure / application, and these improvements and modifications should also be considered within the protection scope of this disclosure / application.

Claims

1. A crank lever flying shear arm fixing mechanism characterized by comprising: include: The blade arm (1) defines the blade arm hole (11). An eccentric shaft (2) is inserted through the cutter arm hole (11), and there is a gap between the eccentric shaft (2) and the cutter arm hole (11); An expansion sleeve (3) is provided in the gap between the eccentric shaft (2) and the cutter arm hole (11). By tightening the bolt of the expansion sleeve (3), the expansion sleeve (3) can tighten the eccentric shaft (2) and the cutter arm.

2. The crank lever flying shear arm fixation mechanism according to claim 1, characterized in that, It also includes a stop (4), which is connected to the cutter arm and the eccentric shaft (2) respectively. The stop (4) is used to restrict the relative rotation of the cutter arm (1) and the eccentric shaft (2).

3. The crank lever flying shear arm fixation mechanism according to claim 2, characterized in that, The stop (4) includes an outer cover (41) disposed at the axial end of the eccentric shaft (2) and a stop disc (42) disposed on the cutter arm, wherein the outer cover (41) is connected to the stop disc (42).

4. The crank-connecting rod scissor arm fixing mechanism according to claim 3, characterized in that, The outer cover (41) has an outer spline on its outer periphery, and the stop plate (42) has an inner spline that mates with the outer spline.

5. The crank-connecting rod scissor arm fixing mechanism according to claim 3, characterized in that, The head of the bolt of the expansion sleeve (3) is located on the side of the expansion sleeve (3) near the stop plate (42).

6. The crank-connecting rod scissor arm fixing mechanism according to claim 5, characterized in that, The vertical projection of the bolt of the expansion sleeve (3) on the stop (4) is located inside the stop disc (42).

7. The crank-connecting rod scissor arm fixing mechanism according to claim 6, characterized in that, The stop plate (42) is detachably connected to the cutter arm by bolts.

8. A flying shear machine, characterized in that, The flying shear machine includes the crank-connecting rod flying shear arm fixing mechanism as described in any one of claims 1-7.

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