Crescent scissors and replacement method thereof

Abstract

The invention discloses a pair of crescent shears and a replacement method thereof, and solves the technical problem that the crescent shears in the prior art are easy to wear during online replacement, the crescent shears comprise a frame and a crescent shear assembly, the crescent shear assembly comprises a knife rest, an upper shear guide, an upper shear assembly and a lower shear assembly, and the upper shear guide is slidably connected with the knife rest; the upper shear assembly comprises an upper shear base and an upper shear blade which are in guiding connection with the upper shear, the upper shear base is provided with a limiting piece abutting against the upper shear blade, and the upper shear blade is provided with an upper shear face. The lower shear assembly comprises a lower shear base and a lower shear blade which are connected with the tool rest, and the lower shear blade is provided with a lower shear face meshed with the upper shear face. The upper shear blade is detachably connected with the upper shear seat, the lower shear blade is detachably connected with the lower shear seat, the upper shear blade and the lower shear blade can be conveniently mounted and dismounted, meanwhile, a limiting part is arranged on the upper shear seat, it can be guaranteed that a limiting face can be formed in the upper shear blade replacement process, accurate alignment of the upper shear blade during mounting is guaranteed, the upper shear blade replacement speed is increased, and the replacement efficiency is improved. Therefore, the mounting precision of the upper shear blade is improved.

Description

Technical Field

[0001] This application belongs to the technical field of crescent shears, and particularly relates to a crescent shear and a replacement method thereof. Background Art

[0002] Due to the unique design of the crescent shear of the MiBach welding machine, the replacement of the crescent shear has a certain degree of professionalism and complexity. The replacement of the shear blade and the adjustment of the gap require a high level. Therefore, the crescent shear must be replaced quickly and efficiently and adjusted to the optimal shear blade gap to ensure the good condition of the crescent notch in the weld area and ensure the continuous rolling operation of the production line. The original method for replacing the crescent shear is on-line replacement. When the crescent shear blade is worn or damaged, only a single component is replaced. When replacing, the shear blade can be accurately installed in place, but the shear blade gap cannot be effectively adjusted to a reasonable standard after installation, resulting in a poor cut surface of the strip steel after shearing, a lot of burrs, and unable to well meet the production requirements. At the same time, the shear blade replacement method is not unified, the randomness is strong each time, and the standard is not clear. Summary of the Invention

[0003] To solve the technical problem that the current on-line replacement of the crescent shear is prone to wear, this application provides a crescent shear and a replacement method thereof.

[0004] In the first aspect of this application, a crescent shear is provided, including a frame and a crescent shear assembly provided on the frame. The crescent shear assembly includes:

[0005] A tool holder;

[0006] An upper shear guide, which is slidably connected to the tool holder;

[0007] An upper shear assembly, including an upper shear seat connected to the upper shear guide and an upper shear blade detachably connected to the upper shear seat. The upper shear seat is provided with a limiting member abutting against the upper shear blade, and the upper shear blade is provided with an upper shear surface;

[0008] A lower shear assembly, including a lower shear seat connected to the tool holder and a lower shear blade detachably connected to the lower shear seat. The lower shear blade is provided with a lower shear surface meshing with the upper shear surface.

[0009] In some embodiments, the upper shear blade is detachably connected to the upper shear seat through a first fastener; the lower shear blade is detachably connected to the lower shear seat through a second fastener.

[0010] In some embodiments, the lower shear surface is arc-shaped, the lower shear blade at least includes a first lower shear blade and a second lower shear blade. The first lower shear blade is provided with a first lower shear surface, the second lower shear blade is provided with a second lower shear surface, and the ends of the first lower shear blade and the second lower shear blade abut against each other so that the first lower shear surface and the second lower shear surface enclose an arc surface.

[0011] In some embodiments, the upper shear blade abuts against the upper shear seat, one of which is provided with a notch and the other is provided with a convex block that mates with the notch.

[0012] In some embodiments, the upper shear blade is provided with a notch, and the upper shear seat is provided with a convex block that mates with the notch;

[0013] Wherein, when the upper shear blade abuts against the upper shear seat, the distance from the top of the limiting member to the top of the convex block of the upper shear seat is equal to the height of the notch.

[0014] In a second aspect of the present application, a method for replacing a crescent shear is provided, including the following steps:

[0015] Removing the crescent shear assembly, moving the crescent shear assembly from the frame to the maintenance platform;

[0016] Disassembling the upper shear blade, guiding and moving the upper shear blade so that the upper shear blade is separated from the lower shear blade, and disassembling the upper shear blade from the upper shear seat;

[0017] Disassembling the lower shear blade, disassembling the lower shear blade from the lower shear seat;

[0018] Pre-assembling the lower shear blade, fitting the lower shear blade to the lower shear seat, and pre-connecting the lower shear blade to the lower shear seat;

[0019] Reassembling the upper shear blade, moving the upper shear blade to fit with the limiting member, and tightly connecting the upper shear blade to the upper shear seat;

[0020] Reassembling the lower shear blade, moving the upper shear blade to engage the upper shear blade with the lower shear blade, arranging a plurality of gaskets at intervals along the radial direction and the circumferential direction of the shear plane, moving the lower shear blade until the lower shear blade fits with the upper shear blade, and tightly connecting the lower shear blade to the lower shear seat;

[0021] Reassembling the crescent shear assembly.

[0022] In some embodiments, before guiding and moving the upper shear blade, it further includes:

[0023] Flipping the tool rest 90 degrees so that the back of the tool rest of the crescent shear abuts against the maintenance platform;

[0024] Disassembling the upper shear blade from the upper shear seat specifically includes: moving the upper shear blade out by a lifting device.

[0025] In some embodiments, after disassembling the upper shear blade from the upper shear seat, clean the mounting surface of the upper shear seat;

[0026] After disassembling the lower cutting blade from the lower cutting seat, clean the mounting surface of the lower cutting seat.

[0027] In some embodiments, a plurality of gaskets are arranged at intervals along the radial direction and the circumferential direction of the shearing surface. Move the lower cutting blade until the lower shearing surface of the lower cutting blade abuts against the gasket, so that the distance between the lower shearing surface of the lower cutting blade and the mounting groove of the lower cutting seat is the thickness of the gasket, and the thickness of the gasket is 0.1 mm to 0.15 mm.

[0028] In some embodiments, after reinstalling the lower cutting blade and before reinstalling the crescent shear assembly, the following steps are further included:

[0029] Fill the gap between one side of the lower cutting blade away from the lower shearing surface and the lower cutting seat with positioning glue, and let it stand for 12 to 14 hours to harden the positioning glue.

[0030] A crescent shear and a replacement method thereof according to one or more embodiments of the present application. The crescent shear includes a frame and a crescent shear assembly provided on the frame. The crescent shear assembly includes a tool rest, an upper shear guide, an upper shear assembly and a lower shear assembly. The upper shear guide is slidably connected to the tool rest; the upper shear assembly includes an upper cutting seat connected to the upper shear guide and an upper cutting blade detachably connected to the upper cutting seat. The upper cutting seat is provided with a limiting member abutting against the upper cutting blade, and the upper cutting blade is provided with an upper shearing surface; the lower shear assembly includes a lower cutting seat connected to the tool rest and a lower cutting blade detachably connected to the lower cutting seat. The lower cutting blade is provided with a lower shearing surface meshing with the upper shearing surface. The upper cutting blade is detachably connected to the upper cutting seat, and the lower cutting blade is detachably connected to the lower cutting seat, which facilitates the installation and disassembly of the upper cutting blade and the lower cutting blade. At the same time, by arranging a limiting member on the upper cutting seat, a limiting surface can be ensured during the replacement process of the upper cutting blade, ensuring accurate alignment during the installation of the upper cutting blade, improving the replacement speed of the upper cutting blade, and thus improving the installation accuracy of the upper cutting blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The structural schematic diagram of the crescent shear assembly of the crescent shear in one or more embodiments of the present application is shown.

[0032] Figure 2 Shown Figure 1 The structural schematic diagram of the tool rest of the crescent shear assembly being flipped 90 degrees and the upper cutting blade being removed.

[0033] Figure 3 Shown Figure 2 The structural schematic diagram of the lower cutting blade of the crescent shear assembly being removed.

[0034] Figure 4 Shown Figure 3 The structural schematic diagram of the lower cutting blade being reinstalled.

[0035] Figure 5Shows Figure 4 Schematic diagram of the structure of the upper shear blade during reinstallation.

[0036] Figure 6 Shows Figure 5 Enlarged schematic diagram of the structure at position A of the upper shear blade during reinstallation.

[0037] Figure 7 Shows Figure 5 Schematic diagram of the structure of the upper shear guide moving.

[0038] Figure 8 Shows Figure 7 Schematic diagram of the structure after placing a gasket on the lower shear blade.

[0039] Figure 9 Shows Figure 8 Schematic diagram of the structure filled with positioning glue.

[0040] Description of reference numerals: 100 - crescent shear, 110 - tool holder, 120 - upper shear guide, 130 - upper shear assembly, 131 - upper shear base, 132 - upper shear blade, 133 - notch, 135 - first fastener, 136 - limiting part, 140 - lower shear assembly, 141 - lower shear base, 142 - lower shear blade, 1421 - first lower shear blade, 1422 - second lower shear blade, 143 - second fastener; 200 - gasket, 300 - positioning glue, 400 - maintenance platform, 500 - lifting ring. Detailed implementation manners

[0041] In order to enable those skilled in the art in the technical field to which the present application pertains to more clearly understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0042] During the operation of online replacing the blades of the crescent shear 100, the operation space is narrow, and the assembly surface of the blades cannot be completely cleaned, there are sanitary dead corners, which will cause the blades to be uneven after reinstallation, affecting the installation accuracy. After the upper shear blade 132 and the lower shear blade 142 are replaced online, affected by the spatial position and cleanliness, the adjustment time of the blade gap is long and the usage accuracy requirements cannot be met. The cut surface after shearing the strip steel is poor, with a lot of burrs, and it is very easy to break the strip at the rolling mill, and it cannot well meet the production requirements. Therefore, a crescent shear 100 is provided to improve the installation accuracy after replacing the crescent shear 100 to meet the production requirements.

[0043] Please refer to Figure 1, in the embodiment of the first aspect of the present application, a crescent shear 100 is provided. The crescent shear 100 includes a frame and a crescent shear 100 assembly provided on the frame. The crescent shear 100 assembly includes a tool rest 110, an upper shear guide 120, an upper shear assembly 130, and a lower shear assembly 140. The upper shear guide 120 is slidably connected to the tool rest 110; the upper shear assembly 130 includes an upper shear seat 131 connected to the upper shear guide 120 and an upper shear blade 132 detachably connected to the upper shear seat 131. The upper shear seat 131 is provided with a limiting member 136 abutting against the upper shear blade 132, and the upper shear blade 132 is provided with an upper shear surface; the lower shear assembly 140 includes a lower shear seat 141 connected to the tool rest 110 and a lower shear blade 142 detachably connected to the lower shear seat 141. The lower shear blade 142 is provided with a lower shear surface meshing with the upper shear surface.

[0044] The tool rest 110 of the crescent shear 100 has a U-shaped back, providing an installation base for the upper shear guide 120. The upper shear guide 120 is used to connect to a driving member, such as a hydraulic cylinder. That is, the top of the upper shear guide 120 is externally connected to the driving member, and the driving member drives the upper shear guide 120 and the upper shear assembly 130 connected to the upper shear guide 120 to move up or down, so as to engage or disengage the upper shear blade 132 and the lower shear blade 142.

[0045] In order to ensure that the upper shear blade 132 can be better limited and fixed during disassembly and installation, by providing the limiting member 136 on the upper shear seat 131, a limiting surface can be ensured during the replacement process of the upper shear blade 132, ensuring the precise alignment during the installation of the upper shear blade 132, improving the replacement speed of the upper shear blade 132, and thus improving the installation accuracy of the upper shear blade 132.

[0046] The lower shear seat 141 is provided with an installation groove, and the lower shear blade 142 is installed in the installation groove. The lower shear blade 142 is installed in the installation groove and is provided with a gap with the groove wall of the installation groove, facilitating the adjustment of the distance between the shear surface of the lower shear blade 142 and the shear surface of the upper shear blade 132 after meshing, and ensuring the shear quality and accuracy of the upper shear blade 132 and the upper shear blade 132.

[0047] Therefore, the upper shear blade 132 is detachably connected to the upper shear seat 131, and the lower shear blade 142 is detachably connected to the lower shear seat 141, facilitating the installation and disassembly of the upper shear blade 132 and the lower shear blade 142. At the same time, by providing the limiting member 136 on the upper shear seat 131, a limiting surface can be ensured during the replacement process of the upper shear blade 132, ensuring the precise alignment during the installation of the upper shear blade 132, improving the replacement speed of the upper shear blade 132, and thus improving the installation accuracy of the upper shear blade 132.

[0048] In some embodiments, the upper cutting blade 132 and the upper cutting seat 131 are detachably connected by a first fastener 135; the upper cutting blade 132 of the crescent shear 100 and the upper cutting seat 131 are detachably connected by a first fastener 135. This connection method facilitates the installation, adjustment, and replacement of the upper cutting blade 132. The upper cutting blade 132 is mounted on the movable upper cutting seat 131, and the lower cutting surface of the upper cutting blade 132 can be an inclined surface so as to gradually fit with the inclined surface of the lower cutting surface of the lower cutting blade 142 during the cutting process. In some embodiments, the first fastener 135 can be a bolt or a screw, that is, the upper cutting blade 132 is connected to the upper cutting seat 131 by a bolt or a screw. This detachable connection method enables the upper cutting blade 132 to be conveniently disassembled and replaced.

[0049] In some other embodiments, the lower cutting blade 142 and the lower cutting seat 141 are detachably connected by a second fastener 143; the lower cutting blade 142 and the lower cutting seat 141 are detachably connected by a second fastener 143. This design also facilitates installation, adjustment, and replacement. In some embodiments, the second fastener 143 can be a bolt or a screw, and the lower cutting blade 142 is connected to the lower cutting seat 141 by a bolt or a screw. This detachable connection method facilitates the installation, adjustment, and replacement of the lower cutting blade 142. In some embodiments, the lower cutting surface of the lower cutting blade 142 can be an inclined surface, which cooperates with the inclined surface of the upper cutting blade 132 to form a cutting action.

[0050] In some embodiments, the lower cutting surface is arc-shaped, and the lower cutting blade 142 at least includes a first lower cutting blade 1421 and a second lower cutting blade 1422. The first lower cutting blade 1421 is provided with a first lower cutting surface, and the second lower cutting blade 1422 is provided with a second lower cutting surface. The ends of the first lower cutting blade 1421 and the second lower cutting blade 1422 are abutted against each other so that the first lower cutting surface and the second lower cutting surface enclose an arc surface. By enclosing a lower cutting blade 142 with two cutting blades, compared with a structure with only one cutting blade, it is convenient to locally adjust the gap between the lower cutting blade 142 and the upper cutting blade 132, thereby improving the precision of the crescent shear 100. The first lower cutting blade 1421 and the second lower cutting blade 1422 are centrosymmetric structures, and the first lower cutting blade 1421 and the second lower cutting blade 1422 are respectively connected to the lower cutting seat 141. In some other embodiments, the lower cutting blade 142 includes an arc-shaped structure spliced by 3 cutting blades, or can also be an arc-shaped structure spliced by 4 cutting blades. Preferably, the lower cutting blade 142 is an arc-shaped structure spliced by two cutting blades, which is not only convenient for local adjustment but also avoids too many connection points, affecting the strength of the lower cutting blade 142.

[0051] In some embodiments, the upper cutting blade 132 abuts against the upper cutting seat 131, one of which is provided with a notch 133 and the other is provided with a convex block that mates with the notch 133. That is, after the upper cutting blade 132 is installed on the upper cutting seat 131, the notch 133 abuts against the convex block, which can limit the upper cutting blade 132, ensure the positioning of the upper cutting blade 132 after disassembly and reinstallation, and facilitate the installation accuracy and speed.

[0052] In some embodiments, the upper cutting blade 132 is provided with a notch 133, and the upper cutting seat 131 is provided with a convex block that mates with the notch 133; wherein, when the upper cutting blade 132 abuts against the upper cutting seat 131, the distance from the top of the limiting member 136 to the top of the convex block of the upper cutting seat 131 is equal to the height of the notch 133. That is, the notch 133 of the upper cutting blade 132 abuts against the convex block of the upper cutting seat 131, and the upper cutting seat 131 forms a primary limit. At the same time, the bottom of the upper cutting blade 132 abuts against the limiting member 136, and the limiting member 136 and the upper cutting seat 131 form a double limit, improving the installation accuracy and installation speed of the upper cutting blade 132.

[0053] In the second aspect of the present application, a method for replacing the crescent shear 100 is provided, including the following steps:

[0054] S100: Removal of the crescent shear 100 assembly, moving the crescent shear 100 assembly from the frame to the maintenance platform 400;

[0055] As Figure 2 shown, moving the crescent shear 100 assembly from the frame to the maintenance platform 400, that is, the crescent shear 100 assembly can be lifted out of the frame by a lifting device and placed on the maintenance platform 400.

[0056] S200: Disassembly of the upper cutting blade 132, moving the upper cutting guide 120 to separate the upper cutting blade 132 from the lower cutting blade 142, and disassembling the upper cutting blade 132 from the upper cutting seat 131;

[0057] As Figure 2 shown, before disassembling the upper cutting blade 132 and the lower cutting blade 142, it is first necessary to move the upper cutting guide 120 to separate the upper cutting blade 132 from the lower cutting blade 142. This creates a certain disassembly space between the upper cutting blade 132 and the lower cutting blade 142, ensuring the safety and smooth progress of the disassembly process. For example, a hydraulic cylinder, a manual hoist or other driving device can be used to drive the upper cutting guide 120 to move away from the lower cutting seat 141, so that the upper cutting blade 132 is completely separated from the contact position of the lower cutting blade 142. This separation can avoid unnecessary damage to the lower cutting blade 142 during the disassembly process and ensure that the upper cutting blade 132 can be successfully disassembled from the upper cutting seat 131.

[0058] S300: Disassembly of the lower cutting blade 142, removing the lower cutting blade 142 from the lower cutting seat 141;

[0059] As Figure 3 shown, the disassembly of the lower cutting blade 142 can be achieved by using appropriate tools such as a wrench or an electric wrench to loosen the fasteners between the lower cutting blade 142 and the lower cutting seat 141 in a certain order. During loosening, ensure the smoothness of the operation to avoid unnecessary damage to the lower cutting seat 141 or the lower cutting blade 142. After loosening all the fasteners, the lower cutting blade 142 can be removed from the lower cutting seat 141.

[0060] S400: Preliminary reinstallation of the lower cutting blade 142, fitting the lower cutting blade 142 to the lower cutting seat 141 and preliminarily connecting the lower cutting blade 142 to the lower cutting seat 141;

[0061] As Figure 4 shown, the preliminary reinstallation of the lower cutting blade 142 means aligning the lower cutting blade 142 with the installation groove of the lower cutting seat 141, ensuring that the installation surface of the lower cutting blade 142 is completely fitted to the installation groove of the lower cutting seat 141. Pay attention to the installation direction of the lower cutting blade 142 to align it with the installation groove of the lower cutting seat 141. After fitting, use bolts or screws to preliminarily fix the lower cutting blade 142 to the lower cutting seat 141. During preliminary connection, do not fully tighten the bolts or screws, just ensure that there is no obvious gap or misalignment between the lower cutting blade 142 and the lower cutting seat 141. The bolts can be tightened gradually in a diagonal manner to ensure that the lower cutting blade 142 is evenly stressed and avoid excessive local stress.

[0062] S500: Reinstallation of the upper cutting blade 132, moving the upper cutting blade 132 to fit with the limiting member 136 and connecting and fastening the upper cutting blade 132 to the upper cutting seat 131;

[0063] As Figure 5 and Figure 6 shown, use a lifting device to move the upper cutting blade 132 to the position where it fits with the limiting member 136, ensuring that the notch 133 position on the installation surface of the upper cutting blade 132 is completely fitted with the convex block of the upper cutting seat 131. After fitting, use bolts or screws to preliminarily fix the upper cutting blade 132 to the upper cutting seat 131. During preliminary connection, do not fully tighten the bolts or screws, just ensure that there is no obvious gap or misalignment between the upper cutting blade 132 and the upper cutting seat 131. The bolts can be tightened gradually in a diagonal manner to ensure that the upper cutting blade 132 is evenly stressed and avoid excessive local stress. After preliminary connection, check the fitting degree between the upper cutting blade 132 and the upper cutting seat 131 to ensure there is no gap or misalignment. After confirming good fitting and correct position, gradually tighten the bolts or screws according to the specified torque value to complete the final fixation. Through this process, the installation quality of the upper cutting blade 132 and the upper cutting seat 131 can be ensured, providing a stable guarantee for subsequent cutting work.

[0064] S600: Reassembly of the lower cutting blade 142. Move the upper cutting blade 132 to engage the upper cutting blade 132 with the lower cutting blade 142. Arrange a plurality of spacers 200 radially along the lower cutting surface and circumferentially along the lower cutting surface. Move the lower cutting blade 142 until the lower cutting blade 142 fits against the upper cutting blade 132, and firmly connect the lower cutting blade 142 to the lower cutting seat 141. After the clearance adjustment is completed, remove the spacers 200, so as to ensure a uniform clearance between the upper cutting surface and the lower cutting surface.

[0065] As Figure 7 and Figure 8 shown, slowly push the upper shear guide 1201 downward to bring the upper cutting blade 132 and the lower cutting blade 142 into a working engagement state. Place the spacers 200 radially along the lower cutting surface, i.e., along the crescent arc direction. The plurality of spacers 200 are arranged circumferentially at intervals along the crescent arc. In some embodiments, the number of spacers 200 is 5, and the thickness of the spacers 200 can be 0.1 - 0.15 mm, i.e., it can be 0.1 mm, 0.12 mm, 0.14 mm or 0.15 mm. The clearance between the upper cutting blade 132 and the lower cutting blade 142 is required to be 0.1 mm. Note that a spacer 200 must be placed at the junction of the two lower cutting blades 142. Slowly loosen the second fastener 143 fixing the lower cutting blade 142 a little, and gently tap the lower cutting blade 142 with a special tool to evenly press it against the upper cutting blade 132, and use a torque wrench to tighten the second fastener 143.

[0066] S700: Reassembly of the crescent shear 100 assembly.

[0067] Then reinstall the cutting blade assembly onto the crescent shear 100 frame to ensure that the lower cutting blade 142 does not displace during the shearing force application, thus causing a change in the mating clearance between the upper and lower cutting blades 142.

[0068] In some embodiments, before moving the upper shear guide 120, i.e., before step S200, it further includes: As Figure 2 shown, flip the tool holder 110 by 90 degrees so that the back surface of the tool holder 110 of the crescent shear 100 abuts against the maintenance platform 400;

[0069] Lift the crescent shear 100 assembly out of the frame with a hoisting device for disassembly and place it on the maintenance platform 400. Flip the tool holder 110 of the crescent shear 100 by ninety degrees so that the back surface of the tool holder 110 contacts the platform.

[0070] In some other embodiments, disassembling the upper cutting blade 132 from the upper cutting seat 131 specifically includes: moving the upper cutting blade 132 out by a hoisting device.

[0071] In some other embodiments, the lifting device is provided with a lifting ring 500, and the upper shear blade 132 is provided with a corresponding lifting opening. The lifting ring 500 is matched with the lifting opening, which facilitates the lifting of the upper shear blade 132 by the lifting device. Since the upper shear blade 132 is relatively heavy, usually 50 - 80 kg, a lifting opening matched with the lifting ring is provided on the upper shear blade 132, which facilitates lifting the upper shear blade 132 out by the lifting device.

[0072] In some embodiments, after the upper shear blade 132 is disassembled from the upper shear seat 131, the mounting surface of the upper shear seat 131 is cleaned; after disassembly, a comprehensive inspection should be carried out on the lower shear blade 142 and the lower shear seat 141, the dirt and impurities on the surface should be cleaned, and whether there is wear or deformation should be checked. For severely worn components, they should be replaced in time to ensure the normal operation of the equipment. Regularly disassembling and inspecting the lower shear blade 142 is an important part of the maintenance of the crescent shear 100. Through disassembly and inspection, potential problems can be discovered and solved in time, the service life of the equipment can be extended, and the shearing quality and efficiency can be improved.

[0073] In some other embodiments, after the lower shear blade 142 is disassembled from the lower shear seat 141, the mounting surface of the lower shear seat 141 is cleaned. After disassembly, a comprehensive inspection should be carried out on the lower shear blade 142 and the lower shear seat 141, the dirt and impurities on the surface should be cleaned, and whether there is wear or deformation should be checked. For severely worn components, they should be replaced in time to ensure the normal operation of the equipment. Regularly disassembling and inspecting the lower shear blade 142 is an important part of the maintenance of the crescent shear 100. Through disassembly and inspection, potential problems can be discovered and solved in time, the service life of the equipment can be extended, and the shearing quality and efficiency can be improved.

[0074] In the prior art, the lower shear blade 142 of the crescent shear 100 is only fastened by bolts. There is a certain gap between the back of the lower shear blade 142 and the lower shear seat 141 due to installation requirements. During the shearing process, when the lower shear blade 142 is under stress, there is a phenomenon of insufficient bolt fastening resulting in displacement of the shear blade, causing the problem of an increased gap between the upper and lower shear blades 142, which is not conducive to shearing.

[0075] Therefore, in some embodiments, a plurality of spacers 200 are arranged at intervals in the radial direction along the lower shearing surface and in the circumferential direction along the lower shearing surface. The lower cutting blade 142 is moved until the lower shearing surface of the lower cutting blade 142 abuts against the spacer 200, so that the distance between the lower shearing surface of the lower cutting blade 142 and the mounting groove of the lower cutting seat 141 is the thickness of the spacer 200, and the thickness of the spacer 200 is 0.1 mm to 0.15 mm. A plurality of spacers 200 are placed along the crescent arc direction, and the lower cutting blade 142 is moved until the lower shearing surface of the lower cutting blade 142 abuts against the spacer 200, so that the distance between the lower shearing surface of the lower cutting blade 142 and the mounting groove of the lower cutting seat 141 is the thickness of the spacer 200, and the thickness of the spacer 200 is 0.1 mm to 0.15 mm. When installing the lower cutting blade 142, note that the upper shear is raised to the highest position, and the lower cutting blade 142 is installed as close as possible to the lower cutting seat 141 to avoid knife biting when the upper shear descends later and to facilitate clearance adjustment. After the clearance adjustment is completed, the spacer 200 is removed, so that the clearance between the upper shearing surface and the lower shearing surface can be ensured to be uniform. That is, after the upper cutting blade 132 and the lower cutting blade 142 are reinstalled, the upper cutting blade 132 and the lower cutting blade 142 are engaged, and the cutting blade clearance is adjusted evenly to avoid cutting blade wear or even chipping, thereby improving the service life of the cutting blade.

[0076] In some embodiments, after the lower cutting blade 142 is reinstalled and before the crescent shear 100 assembly is reinstalled, the following steps are further included: the gap between the side of the lower cutting blade 142 away from the lower shearing surface and the lower cutting seat 141 is filled with a positioning adhesive 300, and it is left to stand for 12 to 14 hours to harden the positioning adhesive 300. First, the contact surface between the back of the lower cutting blade 142 and the lower cutting seat 141 needs to be cleaned to ensure that the surface is free of oil, dust or other impurities. This step is crucial for ensuring the adhesion effect of the positioning adhesive 300. Then, the positioning adhesive 300 is evenly applied to the gap between the back of the lower cutting blade 142 and the lower cutting seat 141. The filling of the positioning adhesive 300 should be as even as possible to avoid the appearance of air bubbles or uneven filling. After the filling is completed, the lower cutting blade 142 and the lower cutting seat 141 need to be kept stationary to avoid external interference. The positioning adhesive 300 usually needs to stand for 12 hours to completely harden. During this period, it should be ensured that the equipment is in a stable state to avoid vibration or movement to ensure that the positioning adhesive 300 can be fully cured. After curing, the positioning adhesive 300 will form a strong adhesion layer, effectively filling the gap between the lower cutting blade 142 and the lower cutting seat 141, enhancing the stability of the connection, and preventing loosening or displacement caused by vibration or impact. Such an operation can not only improve the operating stability of the equipment, but also extend the service life of the equipment and reduce the failures and maintenance costs caused by loose connections. Through the above operations, the connection between the lower cutting blade 142 and the lower cutting seat 141 is more firm and reliable, providing a guarantee for the efficient operation of the crescent shear 100.

[0077] After fixing the crescent assembly, you can select the jog slow mode for testing. The specific steps are as follows:

[0078] Step 1: Select the jog slow mode. First, select a suitable test material. Usually, select a material with the same material and thickness as the strip steel used in actual production. For example, select steel plates with thicknesses of 1.0, 2.0, 3.0, 4.0, 5.0, and 6.0 mm for test shearing. The length of the test material should be long enough to observe the edge quality after shearing.

[0079] Step 2: Secondly, place the test material at the working position of the crescent shear 100 and ensure that the material is aligned with the shear blade. Start the crescent shear 100 and perform the shearing operation. During the shearing process, observe whether the shearing action is stable, and check for any abnormal noises or vibrations. Record any abnormal phenomena during the shearing process.

[0080] Step 3: After shearing is completed, take out the sheared strip steel and carefully observe the quality of the sheared edge. Check whether the edge is flat and smooth, and check for any burrs, cracks, or deformations. Use a magnifying glass or microscope to check for fine defects. At the same time, measure the flatness of the sheared edge and the burr height to ensure compliance with the quality standards. Record the quality data of the sheared edge, including flatness, burr height, and edge shape. Compare these data with the design standards to evaluate whether the shearing quality meets the standard, that is, the proportion of the torn surface of the cut < 20%. If it is found that the shearing quality does not meet the standard, analyze the possible reasons, such as too large or too small shear blade clearance, shear blade wear, etc., and take corresponding adjustment or repair measures.

[0081] In actual production, due to the high shearing frequency of the crescent shear, the shear blades wear quickly, the torn surface of the crescent cut increases, and it is very easy to occur edge cracking and strip breakage in the crescent area during the rolling process, resulting in abnormal shutdown of the production line. Each time it takes about 0.5 hours to handle the fault, and the number of occurrences per month is relatively large, about 6 - 8 times, affecting the normal production capacity of the unit by 3.5 hours. This application is used in actual production. For example: the unit reduces the shutdown faults of edge cracking and strip breakage in the crescent area of the weld by 7 times per year, reduces the shutdown time by 0.5 hours each time, reduces the shutdown time by 3.5 hours per year, reduces the waste by 135 tons. Calculated according to the product selling price of 5000 yuan / ton, the waste price of 2000 yuan / ton, and the unit hourly benefit of 1000 yuan, the present invention can generate an economic benefit of [135*(5000 - 2000)+3.5*1000]*1 = 408,500 yuan per year.

[0082] Thus, through the replacement method of the crescent shear 100 of this application, the process standard can be solidified, which is convenient for maintenance personnel to master, improves the efficiency of replacing the crescent shear 100 and adjusting the clearance, ensures the reliability of the clearance after replacing the crescent shear 100, reduces the burrs of the crescent cut of the strip steel, increases the smooth shearing surface, and thus avoids or reduces the number of strip breaks in the crescent area of the weld during continuous rolling.

[0083] In this application, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0084] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0085] In this application, unless otherwise clearly specified or limited, the terms "connection", "fixation", etc. shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0086] In addition, in this application, the descriptions such as "first", "second", etc. are only for descriptive purposes and should not be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "a plurality" is two or more unless otherwise specifically limited.

[0087] Although the embodiments of this application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of this application, and the scope of this application is defined by the claims and their equivalents.

Claims

1. A crescent shear, comprising a frame and a crescent shear assembly provided on the frame, characterized in that, The crescent shear assembly includes: A tool rest; An upper shear guide which is slidably connected to the tool rest; An upper shear assembly including an upper shear seat connected to the upper shear guide and an upper shear blade detachably connected to the upper shear seat. The upper shear seat is provided with a limiting member abutting against the upper shear blade, and the upper shear blade is provided with an upper shear surface; A lower shear assembly including a lower shear seat connected to the tool rest and a lower shear blade detachably connected to the lower shear seat. The lower shear blade is provided with a lower shear surface meshing with the upper shear surface.

2. The crescent shear according to claim 1, wherein The upper shear blade and the upper shear seat are detachably connected by a first fastener; the lower shear blade and the lower shear seat are detachably connected by a second fastener.

3. The crescent shear according to claim 1, wherein The lower shear surface is arc-shaped. The lower shear blade at least includes a first lower shear blade and a second lower shear blade. The first lower shear blade is provided with a first lower shear surface, and the second lower shear blade is provided with a second lower shear surface. The ends of the first lower shear blade and the second lower shear blade abut against each other so that the first lower shear surface and the second lower shear surface enclose an arc surface.

4. The crescent shear according to any one of claims 1 to 3, characterized in that, The upper shear blade abuts against the upper shear seat, one of them is provided with a notch, and the other is provided with a convex block matching with the notch.

5. The crescent shear according to claim 4, characterized in that, The upper shear blade is provided with a notch, and the upper shear seat is provided with a convex block matching with the notch; Wherein, when the upper shear blade abuts against the upper shear seat, the distance from the top of the limiting member to the top of the convex block of the upper shear seat is equal to the height of the notch.

6. A replacement method for the crescent shear according to any one of claims 1-5, characterized in that, It includes the following steps: Removing the crescent shear assembly, moving the crescent shear assembly from the frame to the maintenance platform; Removing the upper shear blade, moving the upper shear guide so that the upper shear blade is separated from the lower shear blade, and removing the upper shear blade from the upper shear seat; Removing the lower shear blade, removing the lower shear blade from the lower shear seat; Pre-assembling the lower shear blade, fitting the lower shear blade to the lower shear seat, and pre-connecting the lower shear blade to the lower shear seat; Reassembling the upper shear blade, moving the upper shear blade to fit with the limiting member, and tightly connecting the upper shear blade to the upper shear seat; Reassembling the lower shear blade, moving the upper shear blade to mesh the upper shear blade with the lower shear blade, arranging a plurality of gaskets at intervals along the radial direction and the circumferential direction of the shear surface, moving the lower shear blade until the lower shear blade abuts against the upper shear blade, and tightly connecting the lower shear blade to the lower shear seat; Reassembling the crescent shear assembly.

7. The replacement method of the crescent shear according to claim 6, characterized in that, Before moving the upper shear guide, it further includes: flipping the tool rest by 90 degrees so that the back of the tool rest of the crescent shear abuts against the maintenance platform; Removing the upper shear blade from the upper shear seat specifically includes: moving the upper shear blade out by a lifting device.

8. The replacement method of the crescent shear according to claim 6, characterized in that, After removing the upper shear blade from the upper shear seat, cleaning the mounting surface of the upper shear seat; After removing the lower shear blade from the lower shear seat, cleaning the mounting surface of the lower shear seat.

9. The replacement method of the crescent shear according to any one of claims 6-8, characterized in that Arranging a plurality of gaskets at intervals along the radial direction and the circumferential direction of the shear surface, moving the lower shear blade until the lower shear surface of the lower shear blade abuts against the gasket so that the distance from the lower shear surface of the lower shear blade to the mounting groove of the lower shear seat is the thickness of the gasket, and the thickness of the gasket is 0.1 mm to 0.15 mm.

10. The replacement method of the crescent shear according to any one of claims 6-8, characterized in that, After the reinstallation of the lower cutting blade and before the reinstallation of the crescent shear assembly, the following steps are further included: Fill the gap between the side of the lower cutting blade away from the lower cutting surface and the lower shear seat with positioning glue, and let it stand for 12 to 14 hours to harden the positioning glue.

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