Dismounting tool and method for disc shear blade

Abstract

According to the disassembling tool and method for the disc shear blades, a balance plate is connected to a mandrel in a sleeving mode, clamping jaws are automatically embedded into the bottoms of the disc shear blades, the balance plate is pulled upwards, the clamping jaws can drive all the disc shear blades to be lifted out of the mandrel at a time, jamming caused by unbalanced force application is reduced, and efficiency and safety are improved. Hoisting pieces do not need to be installed on the disc shear blades, dismounting efficiency is improved, and construction difficulty is reduced. According to the main technical scheme, the disassembling tool for the disc shear blade is characterized in that a receding hole penetrating through a first side and a second side is formed in a balance plate; the lifting lugs are connected to the first side of the balance plate, and the multiple lifting lugs are evenly distributed around the receding hole. The multiple clamping jaws are evenly distributed in the circumferential direction of the balance plate, the top ends of the clamping jaws are rotationally connected with the balance plate, and the bottom ends of the clamping jaws are bent inwards and used for stretching into the positions below the disc shear blades. The tool is mainly used for disassembling the disc shear blade from the mandrel.

Description

Technical Field

[0001] The invention relates to the technical field of disc scissor blade processing, and in particular to a disassembly tool and method for a disc scissor blade. Background Art

[0002] To facilitate grinding the outer surface of large circular shear blades, the blades are often strung together using a mandrel and then hoisted onto a grinding machine for grinding. To remove the disc blades from the mandrel, the existing process involves attaching slings, lugs, and shackles to the blades. A crane is then used to remove the individual disc blades from the bottom up. For example, if a set of eight disc blades consists of a single set, each needs to be removed one by one.

[0003] Due to the installation deviation of the lifting strap, lifting lug, and shackle, as well as the positioning deviation during the lifting process, and the assembly clearance between the disc scissor blade and the core shaft is only 1mm, it is easy for the disc scissor blade to get stuck during the disassembly process. In this case, you need to use a copper hammer to knock the disc scissor blade from bottom to top in four directions. After it is loosened, use the overhead crane to tighten it upwards. Under the action of the critical point of force, use the copper hammer again to knock from bottom to top in four directions, tighten, knock, tighten, and knock until the disc scissor blade is completely removed.

[0004] The original disassembly method was inefficient. A set of eight disc shears had to be disassembled one by one, requiring each disc to be hoisted. This was significantly less efficient than removing all eight discs at once. Disassembling the eight discs one by one also increased the chance of them getting stuck, posing a significant safety hazard when tapping. The disc shears had sharp edges, and improper tapping could easily cause scratches. Summary of the Invention

[0005] In view of this, an embodiment of the present invention provides a disassembly tool and method for a disc scissors blade, which is mainly used to solve the problem that the existing disc scissors blades need to be disassembled one by one, which is inefficient and has a high risk of getting stuck.

[0006] To achieve the above objectives, the present invention mainly provides the following technical solutions:

[0007] In one aspect, the present invention provides a disassembly tool for a disc shear blade, which is used to disassemble the disc shear blade from a core shaft. The tool comprises:

[0008] A balance board, the balance board includes a first side and a second side opposite to each other, and a clearance hole is formed on the balance board, passing through the first side and the second side;

[0009] A plurality of lifting ears are connected to the first side of the balance board, and the plurality of lifting ears are evenly distributed around the clearance hole;

[0010] A plurality of claws are evenly distributed around the circumference of the balance plate, the top ends of the claws are rotatably connected to the balance plate, and the bottom ends of the claws are bent inwardly for extending under the disc scissors blades.

[0011] The difference between the inner diameter of the clearance hole and the outer diameter of the core shaft is greater than or equal to 70 mm and less than or equal to 100 mm.

[0012] There are four lifting ears, each of which is provided with an ear hole; and there are three claws.

[0013] Among them, tooling also includes:

[0014] A joint connected to the edge of the balance plate and extending radially outward, with a clearance notch formed on the joint;

[0015] A rotating shaft connected to the joint and spanning the clearance gap;

[0016] A connecting hole is provided on the top of the clamping claw, and the connecting hole is rotatably sleeved on the rotating shaft.

[0017] The claw includes a first area and a second area. One end of the first area is rotatably connected to the balance board, and the second area is connected to the other end of the first area. Both the second area and the first area are straight strips, and the second area is perpendicular to the first area.

[0018] The second areas of different claws extend toward each other in a direction away from the first area, so that the bottom ends of the claws are bent inwards, and the second areas are used to extend under the disc scissors blade.

[0019] Wherein, an anti-slip groove is provided on the upper portion of the second area.

[0020] The claw includes a counterweight, and the counterweight and the second area are respectively located on different sides of the first area. The counterweight is used to make the end of the first area where the second area is provided have a tendency to move inward.

[0021] Among them, a plurality of telescopic rulers are connected to the first side of the balance plate, and the plurality of telescopic rulers are evenly arranged around the circumference of the clearance hole. The telescopic rulers are movably connected to the balance plate. The telescopic rulers can slide in the radial direction of the balance plate and extend out of the clearance hole to different degrees to measure the gap between the clearance hole and the core shaft.

[0022] On the other hand, the present invention further provides a method for disassembling a disc scissors blade, which is used for disassembling tooling of any of the above-mentioned disc scissors blades, and the method comprises:

[0023] The wire rope is connected to the lifting lug and the disassembly tooling of the disc shear blade is lifted;

[0024] Move the balance plate to be just above the core shaft, with the clearance hole of the balance plate corresponding to the core shaft;

[0025] Move the clamping claw to expand the bottom end of the clamping claw outward, and lower the balance plate to allow the core shaft to pass through the clearance hole, releasing the clamping claw, and the bottom end of the clamping claw is located outside the disc scissors blade;

[0026] Lower the balance plate until the bottom end of the claw is lower than the bottom surface of the disc scissors blade, the claws are retracted and gathered, and the bottom end of the claws extends under the disc scissors blade;

[0027] The balance plate is raised, and the claws lift the disc scissors out and away from the core shaft.

[0028] Wherein, after the step of moving the claws so that the bottom ends of the claws are extended outward, lowering the balance plate, allowing the core shaft to pass through the clearance hole, releasing the claws, and positioning the bottom ends of the claws outside the disc scissors blade, and before the step of lowering the balance plate until the bottom ends of the claws are lower than the bottom surface of the disc scissors blade, the claws are retracted and gathered, and the bottom ends of the claws are extended under the disc scissors blade, the method further includes:

[0029] Measure the gaps between different sides of the mandrel and the clearance hole, and adjust the horizontal position of the balance plate so that the difference in the gaps on different sides is less than a threshold value.

[0030] The present invention proposes a tooling and method for disassembling a disc scissor blade, which mainly uses a circumferentially arranged rotatable claw. When in use, the claw can be opened outward, the balance plate is sleeved on the core shaft, and the bottom end of the claw continues to descend along the side wall of the disc scissor blade. When the claw is bent below the disc scissor blade, it will retract under the action of gravity and then automatically embed into the bottom of the disc scissor blade. Pulling up the balance plate, the claw can drive all the disc scissor blades to be lifted out of the core shaft at once. Compared with the method of lifting and disassembling one by one, the one-time disassembly greatly reduces the jamming problem caused by unbalanced force and increases efficiency and safety. At the same time, there is no need to install lifting parts such as connecting ears on each disc scissor blade, which greatly increases disassembly efficiency and reduces construction difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of a use scenario of a disassembly tool for a disc scissors blade provided by an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of the structure of a disassembly tool for a disc scissors blade provided in an embodiment of the present invention;

[0033] Figure 3 A schematic structural diagram of a partial structure of a disassembly tool for a disc scissors blade provided by an embodiment of the present invention;

[0034] Figure 4 A schematic structural diagram of a balancing plate and a joint in a disassembly tool for a disc shear blade provided by an embodiment of the present invention;

[0035] Figure 5A schematic structural diagram of a lifting lug in a disassembly tool for a disc scissors blade provided by an embodiment of the present invention;

[0036] Figure 6 A schematic structural diagram of a clamping claw in a disassembly tool for a disc scissors blade provided by an embodiment of the present invention;

[0037] Figure 7 A schematic diagram of the structure of a clamping claw in another tool for disassembling a circular scissors blade provided by an embodiment of the present invention;

[0038] Figure 8 The present invention provides a flowchart of a method for disassembling a circular scissors blade. DETAILED DESCRIPTION

[0039] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the following, in combination with the accompanying drawings and preferred embodiments, describes in detail the specific implementation method, structure, characteristics and effects of a disassembly tool for a disc scissors blade proposed by the present invention.

[0040] The disc shear blade 20, also known as a disc shear, is a disc-shaped scissor installed on the production line of a sheet metal factory. After a specified period of time, the disc shear's blade may become blunt or chipped. It needs to be removed, assembled onto a designated mandrel 10, and then ground on a cylindrical grinder to remove chipping on the disc shear's outer cylindrical surface and restore its sharp edge.

[0041] For example, if 8 disc scissor blades 20 need to be ground, the axis of the core shaft 10 is set vertically, and the 8 disc scissor blades are hoisted onto the core shaft 10 for auxiliary grinding in sequence. For related technology, please refer to the patent publication number CN117415727A. After locking, the core shaft 10 is flipped from the vertical state to the horizontal state, the grinder transmission clamp is installed, and it is hoisted onto the grinder for grinding. After grinding, the core shaft 10 is flipped from the horizontal state to the vertical state, and then the disc scissor blades 20 can be disassembled. That is, the present application is to adjust the core shaft 10 to the following state: Figure 1 After vertical placement as shown, the tooling and method for disassembly are shown.

[0042] like Figure 2-3 As shown, an embodiment of the present invention provides a disassembly tool 30 for a disc scissors blade, which is used to disassemble the disc scissors blade 20 from the core shaft 10. The tool 30 includes:

[0043] The balancing board 100 includes a first side and a second side opposite to each other, and a clearance hole 101 is formed on the balancing board 100 and passes through the first side and the second side;

[0044] A plurality of lifting ears 200 , the lifting ears 200 being connected to the first side of the balance board 100 , and the plurality of lifting ears 200 being evenly distributed around the clearance hole 101 ;

[0045] The plurality of claws 300 are evenly distributed around the circumference of the balance board 100 . The top ends of the claws 300 are rotatably connected to the balance board 100 , and the bottom ends of the claws 300 are bent inwardly to extend under the disc scissor blade 20 .

[0046] In the disc scissors blade disassembly tool 30, the movable claw 300 allows the disc scissors blade disassembly tool 30 to have multiple states. In the following description of this application, unless otherwise specified, the description of the structure, such as the direction, is based on the balance board 100 being horizontal and the claw 300 being naturally drooped without external force.

[0047] The disc shear blade disassembly tool 30 can be made of Q355 steel plate, which has a deformation resistance of ≥100GPa and a tensile strength of ≥400MPa. It offers superior performance and can meet lifting requirements of up to 6 tons with a transfer force of ≈58.860N. It also ensures that the claws 300 will not break in the event of an abnormality during the lifting process. Flame cutting is also possible, offering low cost and high cutting speed.

[0048] The balance plate 100 is a planar plate-like structure with a first side and a second side being two flat surfaces. The clearance hole 101 is a circular hole. If the outer diameter of the core shaft 10 is 813 mm, the inner hole of the balance plate should be greater than 900 mm, so that the balance plate 100 can move freely up and down relative to the core shaft 10, while having sufficient clearance to meet the requirements of relative position measurement. In some embodiments, the difference between the inner diameter of the clearance hole 101 and the outer diameter of the core shaft 10 is greater than or equal to 70 mm and less than or equal to 100 mm, thereby ensuring that the balance plate 100 has sufficient structural strength. Figure 4 As shown, the diameter a2 of the clearance hole 101 may be 900 mm ± 2 mm. The thickness of the balance plate 100 may be 40 ± 1 mm.

[0049] The lifting lug 200 is connected to the top surface of the balance plate 100 by welding, and is used to be connected to the lifting rope of the overhead travelling crane 40. The lifting lug 200 is the direct and main component receiving the force.

[0050] The claw 300 is a roughly bar-shaped component that can swing relative to the balance board 100. The top of the claw 300 is rotatably connected to the balance board 100, and the bottom of the claw 300 is bent inward, allowing the bottom ends of the multiple claws 300 to open and close relative to each other, making way for the disc blades 20 and extending beneath the disc blades 20 when passing over them. The inward bending of the bottom end of the claw 300 means that when the claw 300 is naturally drooping without external force, the bottom end of the claw 300 bends toward the axis of the balance board 100, forming an inward protrusion, allowing it to extend beneath the disc blades 20. The claw 300 can be connected to an edge of the balance board 100 or to the second side surface of the balance board 100. Extending beneath the disc blades 20 refers to extending beneath all of the disc blades 20, or more specifically, beneath the disc blades 20 at the bottom layer.

[0051] The plurality of lifting ears 200 are evenly distributed around the clearance hole 101 , and the plurality of claws 300 are evenly distributed around the circumference of the balancing plate 100 , thereby achieving force balance between the balancing plate 100 and the disc scissor blade 20 .

[0052] The present invention proposes a tooling and method for disassembling a disc scissor blade, which is mainly based on a circumferentially arranged rotatable claw. When in use, the claw can be opened outward, the balance plate is sleeved on the core shaft, and the bottom end of the claw continues to descend along the side wall of the disc scissor blade. When the claw is bent below the disc scissor blade, it will retract under the action of gravity and then automatically embed into the bottom of the disc scissor blade. Pulling up the balance plate, the claw can drive all the disc scissor blades to be lifted out of the core shaft at once. Compared with the method of lifting and disassembling one by one, the one-time disassembly greatly reduces the jamming problem caused by unbalanced force and increases efficiency and safety. At the same time, there is no need to install lifting parts such as connecting ears on each disc scissor blade, which greatly increases disassembly efficiency and reduces construction difficulty.

[0053] In one embodiment, the outer contour of the balancing board 100 can be circular, with the outer diameter of the balancing board 100 being related to the size of the corresponding disc blade 20. For example, the outer diameter of the disc blade 20 is a maximum of 1300 mm, and the outer diameter a1 of the balancing board 100 is 1250 mm. After the claws 300 are mounted on the edge of the balancing board 100, the outer diameter of the circular area defined by the top of the claws 300 is substantially the same as the outer diameter of the disc blade 20. This ensures that the claws 300 can enter under the disc blade 20 while in a substantially vertical position. Calculating from the axisymmetric stress formula, the stress distribution of the circular balancing board 100 is solely related to the radius R, with no directional changes and a MPa of 12. The board is isotropic, with uniform stiffness and a standard deviation of deflection of 0.3. If the balance board 100 is square, for example, with an outer dimension of 1250 mm x 1250 mm, the stress concentration factor at the corners of the balance board 100 is approximately twice the average stress, increasing toward the edges. The stress concentration factor is 21.12 MPa, approximately 1.76 times that of a circular balance board 100. The stiffness along the diagonal direction decreases by approximately 30%, and the standard deviation of the edge deflection is 1.8. This shows that the circular balance board 100 selected in this embodiment offers improved performance, is less susceptible to damage due to stress during hoisting, and is less likely to be tilted or slanted due to deformation.

[0054] like Figure 5 As shown, the ear hole 201 is provided on the lifting ear 200, and the ear hole 201 is used to connect a lifting device, such as a steel rope of an overhead crane (40). The width e of the ear hole 201 can be 170 mm, and the inner diameter f of the ear hole 201 is 42 mm.

[0055] The number of lifting lugs 200 can be selected as needed. For example, in this embodiment, the hoisted object weighs 6t and needs to be lifted safely, and can withstand 10% eccentric lifting. It is necessary to ensure that the lifting point is evenly stressed, and the ideal state of force on a single lug is ≤1.5t; the safety factor threshold is ≥5; the anti-eccentricity ability is strong, and the maximum force difference of the eccentric load is ≤100%. The number of lifting lugs 200 can be set to four, meeting the ideal state of F single = 6t / 4 = 1.5t, and using balanced F single point max = 1.5tX1.2 = 1.8t. Maximum single point force: 1.8t converted to 17.6kN, lifting lug cross-sectional area: 375mm 2The actual working stress is: F / A = 17.6 x 103 N / 375 mm3 = 46.1 MPa, and the safety factor is: yield / actual stress = 355 / 46.1 = 7.7. The redundant design achieves a maximum force differential of 50% under eccentric load. Compared to using three lifting lugs 200, with a non-ideal 10% eccentricity, the F single point maximum is 2t x 1.5 = 3t. The actual working stress is: F / A = 29.4 x 103 N / 375 mm3 = 78.4 MPa, and the safety factor is: yield / actual stress = 355 / 78.4 = 4.5. With a maximum force differential of 200% under eccentric load, four lifting lugs 200 can better meet the requirements.

[0056] The number of jaws 300 can be adjusted based on actual needs. The centering adjustment time should be ≤ 10 seconds. The simple structure, direct torque transmission, and reliable, non-destructive device are suitable for quickly clamping symmetrical workpieces. If there are three jaws 300, the automatic centering adjustment time is 0 seconds. However, using four jaws 300 requires longer adjustment time, requires more tooling components, and is more inconvenient to install and process.

[0057] The claw 300 can be rotatably connected to the balance board 100 in a variety of ways. In one embodiment, Figure 4 As shown, the tooling also includes a connector 400 connected to the edge of the balance board 100 and extending radially outward. A clearance notch 401 is defined in the connector 400. A rotating shaft 500 is connected to the connector 400 and spans the clearance notch 401. A connecting hole 301 is defined at the top end of the claw 300, and the connecting hole 301 is rotatably sleeved onto the rotating shaft 500.

[0058] In the embodiment where there are three claws 300, there are also three joints 400. The joints 400 and the balance board 100 can be welded or formed as one piece. To ensure the connection strength of the joints 400, the welding position of the root of the joints 400 is wider than that of the head. Figure 4 In the embodiment, the width d of the root of the joint 400 can be 300 mm, and the width b of the head can be 150 mm. The width of the notch 401 is slightly larger than the width of the top of the claw 300, and should not be too wide to prevent the claw 300 from shaking. For example, the width c of the notch 401 is 42 mm. The width of the top of the claw 300 can be 38 mm. The shaft 500 spans the notch 401 to ensure that the position of the shaft 500 is stable and the angle of the claw 300 is not easily changed after long-term use. The shaft 500 can be an optical axis, and the shaft 500 and the joint 400 can be welded, such as the top surface of the joint 400 can be welded, to prevent the weld from being easily detached due to pulling down.

[0059] Furthermore, with the embodiment of the joint 400 described above, when the disc scissors blade disassembly tool is not in use, the claw 300 can be flipped upward to above the balance board 100, thereby forming a storage state. The second side, i.e., the lower surface, of the balance board 100 can be placed directly and stably on the ground. The claw 300 is located at the top and is not easily damaged, providing strong structural stability when stored. When in use, the balance board 100 can be hoisted first, and the operator can move the claw 300 downward to below the balance board 100, and then it can fall naturally.

[0060] In one embodiment, Figure 6 As shown, the claw 300 includes a first region 310 and a second region 320. One end of the first region 310 is rotatably connected to the balance board 100, and the second region 320 is connected to the other end of the first region 310. The second region 320 and the first region 310 are both straight strips, and the second region 320 is perpendicular to the first region 310. The second regions 320 of different claws 300 extend toward each other in a direction away from the first region 310, so that the bottom end of the claw 300 is bent inward. The second region 320 is used to extend under the disc scissor blade 20.

[0061] Specifically, the claw 300 is generally L-shaped, with the second region 320 and the first region 310 both being straight, rod-like structures, such as square rods. A connection hole 301 is provided at one end of the second region 320, which is rotatably connected to the shaft 500. When the claw 300 is not subjected to external forces, the first region 310 is in a vertical position, or nearly vertical, and the second region 320 is in a horizontal position, or nearly horizontal.

[0062] When the claw 300 is not subjected to external force, the setting position of the claw 300 satisfies that the second area 320 overlaps with the projection of the disc scissors blade 20 in the vertical direction, or in other words, the circular area defined by the end of the second area 320 away from the first area 310 is smaller than the outer contour of the disc scissors blade 20, thereby allowing the second area 320 to extend under the disc scissors blade 20 in a natural state.

[0063] In some embodiments, Figure 5 Therefore, the jaw 300 may have the following dimensions: a total height g of the jaw 300 is 1.40 mm, a thickness h of the jaw 300 is 60 mm, and a length i of the second region 320 is 200 mm.

[0064] In one embodiment, the height of the second region 320 away from the first region 310 is less than the height close to the first region 310, thereby making the end of the second region 320 flatter and easier to enter under the disc scissor blade 20. For example, the first height j of the second region 320 close to the first region 310 is 45 mm, and the second height k away from the first region 310 is 40 mm.

[0065] In some other embodiments, the bottom surface of the second area 320 may have an upward tendency on the pay-off line away from the first area 310, that is, in the process of the claw 300 moving downward, the bottom surface of the second area 320 and the edge of the disc scissors blade 20 can push the claw 300 to expand outward to make way for the disc scissors blade 20 without the need to manually move the claw 300 outward.

[0066] In one embodiment, an anti-slip groove 321 is provided on the upper surface of the second area 320. For example, five anti-slip grooves 321 are provided on the top surface of the second area 320 perpendicular to the extension direction of the second area 320 to achieve a friction connection with the disc scissor blade 20, making it difficult to fall out from under the disc scissor blade 20. In some embodiments, a relatively anti-slip material can also be embedded in the upper surface of the second area 320.

[0067] In one embodiment, Figure 7 As shown, the claw 300 includes a counterweight 330 , which is located on different sides of the first area 310 from the second area 320 . The counterweight 330 is used to make the end of the first area 310 where the second area 320 is located tend to move inward.

[0068] During the installation process, the claw 300 is first opened outward by the external force of the staff, and then the claw 300 is released. The bottom end of the claw 300 will abut the outer side or side wall of the disc scissors blade 20. As the claw 300 continues to move downward until it passes over the disc scissors blade 20, the claw 300 loses the support of the disc scissors blade 20, and the counterweight 330 acts to make the claw 300 move inward quickly, that is, move to the side of the second area 320 opposite to the counterweight 330, and make the claw 300 more retracted in the natural state, such as tilted inward, so that the claw 300 can be tightened more smoothly and enter under the disc scissors blade 20, and enter under the disc scissors blade 20 as much as possible. In addition, when the disc scissor blade 20 has multiple models, that is, different outer diameters, the counterweight 330 also increases versatility, that is, it can be tilted inward according to the reduction of the inner diameter of the disc scissor blade 20, ensuring that the second area 320 can completely enter under the disc scissor blade 20.

[0069] In some embodiments, a first side of the balancing plate 100 is connected to multiple telescopic rulers, evenly spaced around the clearance hole 101, such as four. The telescopic rulers are movably connected to the balancing plate 100, sliding radially along the balancing plate 100 and extending beyond the clearance hole 101 to varying degrees, thereby measuring the gap between the clearance hole 101 and the mandrel 10. An upwardly arched half strip can be welded to the upper surface of the balancing plate 100 to form an insertion interface, into which the telescopic rulers are slidably inserted. The telescopic rulers are provided with graduations, extending toward the clearance hole 101, and the distance between the mandrel 10 and the clearance hole 101 is read using the graduations corresponding to the edge of the clearance hole 101.

[0070] On the other hand, Figure 8 As shown, the present invention also provides a method for disassembling a disc scissors blade, which is used for the disassembly tool 30 of the disc scissors blade described above, and the method comprises:

[0071] S1: The wire rope is connected to the lifting lug 200 and the disassembly tool 30 of the disc shear blade is lifted.

[0072] The wire rope of the overhead crane 40 is passed through the ear hole 201 of the lifting lug 200 and the balance board 100 is lifted so that the claw 300 is released from the support and naturally droops. The overhead crane 40 and the wire rope are adjusted so that the balance board 100 is in a horizontal state and the wire rope is taut.

[0073] S2: Move the balancing plate 100 to be just above the core shaft 10 , so that the clearance hole 101 of the balancing plate 100 corresponds to the core shaft 10 .

[0074] Through manual observation, the clearance hole 101 and the core shaft 10 are positioned on the same axis as much as possible. At this time, the claw 300 droops naturally, and the second area 320 of the claw 300 overlaps with the disc scissors blade 20 in the vertical direction.

[0075] S3: Move the claw 300 to expand the bottom end thereof, and lower the balance plate 100 to allow the core shaft 10 to pass through the clearance hole 101 , releasing the claw 300 , with the bottom end of the claw 300 located outside the disc scissors blade 20 .

[0076] The staff member manually moves the claw 300 to make way for the disc scissor blade 20 and lowers the balance board 100 until the bottom of the claw 300, or in other words, the second area 320 of the claw 300, aligns with the side of the disc scissor blade 20. At this point, the claw 300 can be released, and the claw 300 will abut the side of the disc scissor blade 20 under the action of gravity. In some embodiments, the position of the balance board 100 can be adjusted, such as by measuring the gap between different sides of the core shaft 10 and the clearance hole 101 and adjusting the horizontal position of the balance board 100 so that the difference in gap between different sides is less than a threshold. For example, a comparison ruler can be used, such as in the embodiment including a telescopic ruler described above, or a ruler available on site can be used in addition. Taking the telescopic ruler as an example, manually push the ruler until it abuts the core shaft 10. Read the scale of the ruler corresponding to the edge of the clearance hole 101 to determine the gap size. The scale of multiple positions or individual scales is determined to ensure that the gap difference is less than a threshold, which can be 10mm, 8mm, etc., to ensure that the gap is nearly consistent. This ensures that the second areas 320 of the plurality of claws 300 can evenly enter the bottom of the disc scissor blade 20, and prevents the problem of the second areas 320 of some claws 300 not being able to fully enter the bottom of the disc scissor blade 20 due to the position error of the balance plate 100. This prevents the disc scissor blade 20 from being tilted due to uneven force and getting stuck with the core shaft 10, and ensures that the disc scissor blade 20 is forced vertically upward. In addition, it also prevents the claws 300 from falling out due to uneven force.

[0077] S4: Lower the balance board 100 until the bottom end of the clamping claw 300 is lower than the bottom surface of the disc scissors blade 20, and the clamping claw 300 is retracted and gathered, and the bottom end of the clamping claw 300 extends under the disc scissors blade 20.

[0078] As the balance board 100 continues to descend, the claws 300 will slide down along the sidewall of the disc scissor blade 20 until they pass over the disc scissor blade 20. The second area 320 will lose the support of the disc scissor blade 20 and slide under the disc scissor blade 20. If the counterweight 330 is provided, the second area 320 will enter under the disc scissor blade 20 faster and more completely.

[0079] S5: The balance plate 100 is raised, and the claws 300 lift the disc scissor blade 20 out and separate it from the core shaft 10.

[0080] The second area 320 lifts the disc scissor blades 20 upward from below the disc scissor blades 20 at the bottom end, so that all the disc scissor blades 20 move upward relative to the core shaft 10 until they are completely removed from the core shaft 10, thereby realizing a one-time removal of all the disc scissor blades 20.

[0081] Economic benefit calculation:

[0082] The formula for calculating the benefits of reducing unplanned downtime is: hourly output of this process × total reduction in downtime × process benefit contribution coefficient × unit product benefit × effective operating rate - development cost.

[0083] It is known that the target process hourly output is 211.211t / h; the total downtime reduction is 31.3h; the process efficiency contribution coefficient is 15%; the unit product efficiency is 233 yuan / ton; the effective operation rate is 81.51%; the development cost is a one-time investment of 1,371.74 yuan.

[0084] Among them: the total downtime reduction is calculated to be 31.3h:

[0085] Before: During the activity period, the blade jammed 37 times, each time taking 20 minutes. This adds up to 37 jams * 20 minutes per jam = 740 minutes. Removing 8 disc blades took 100 minutes per set. During the activity period, 12 sets were removed. This adds up to 1200 minutes per set * 100 minutes per set = 1200 minutes.

[0086] Total time before the activity: (740 minutes for cutting + 1200 minutes for disassembly) / 60 minutes = 32.3 hours.

[0087] The disassembly tool for the disc scissors blades of the present application takes 5 minutes to successfully disassemble a set of disc scissors blades. 12 sets can be disassembled during the activity period.

[0088] Total time after activity: (5 minutes / set * 12 sets) / 60 minutes = 1 hour.

[0089] Reduce total downtime: 32.3 hours before the event - 1 hour after the event = 31.3 hours.

[0090] The benefit of reducing unplanned downtime = (211.211t / h*31.3h*15%*233 yuan / ton*81.51%)-1371.74 yuan = 186,900 yuan.

[0091] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A disassembly tool for a disc scissors blade, characterized in that: Used for removing a circular shear blade (20) from a core shaft (10), the tool comprises: A balancing board (100), the balancing board (100) comprising a first side and a second side opposite to each other, and a clearance hole (101) penetrating the first side and the second side is formed on the balancing board (100); a plurality of lifting ears (200), the lifting ears (200) being connected to a first side of the balance board (100), and the plurality of lifting ears (200) being evenly distributed around the clearance hole (101); A plurality of claws (300) are evenly distributed around the circumference of the balance plate (100), the top ends of the claws (300) are rotatably connected to the balance plate (100), and the bottom ends of the claws (300) are bent inwardly to extend under the disc scissor blade (20).

2. The disassembly tool for the disc scissors blade according to claim 1, characterized in that: The difference between the inner diameter of the clearance hole (101) and the outer diameter of the core shaft (10) is greater than or equal to 70 mm and less than or equal to 100 mm.

3. The disassembly tool for the disc scissors blade according to claim 1, characterized in that: The number of the hanging ears (200) is four, and each of the hanging ears (200) is provided with an ear hole (201); The number of the claws (300) is three.

4. The disassembly tool for the disc scissors blade according to claim 1, characterized in that: The tooling also includes: A connector (400), the connector (400) is connected to the edge of the balance plate (100) and extends radially outward, and a clearance notch (401) is formed on the connector (400); a rotating shaft (500), the rotating shaft (500) being connected to the joint (400) and spanning the clearance notch (401); A connecting hole (301) is provided at the top end of the clamping claw (300), and the connecting hole (301) is rotatably sleeved on the rotating shaft (500).

5. The disassembly tool for the disc scissors blade according to claim 1, characterized in that: The claw (300) includes a first area (310) and a second area (320), one end of the first area (310) is rotatably connected to the balance board (100), and the second area (320) is connected to the other end of the first area (310), the second area (320) and the first area (310) are both straight strips, and the second area (320) is perpendicular to the first area (310); The second regions (320) of the different clamping claws (300) extend toward each other in a direction away from the first region (310), so that the bottom end of the clamping claw (300) is bent inward, and the second region (320) is used to extend under the disc scissor blade (20).

6. The disassembly tool for the disc scissors blade according to claim 5, characterized in that: An anti-slip groove (321) is provided on the second area (320).

7. The disassembly tool for the disc scissors blade according to claim 5, characterized in that: The claw (300) includes a counterweight (330), and the counterweight (330) and the second area (320) are respectively located on different sides of the first area (310). The counterweight (330) is used to make the end of the first area (310) where the second area (320) is provided have a tendency to move inward.

8. The disassembly tool for the disc scissors blade according to claim 1, characterized in that: A plurality of telescopic rulers are connected to a first side of the balancing plate (100), and the plurality of telescopic rulers are evenly distributed circumferentially around the clearance hole (101). The telescopic rulers are movably connected to the balancing plate (100), and the telescopic rulers can slide in the radial direction of the balancing plate (100) to extend out of the clearance hole (101) to varying degrees to measure the gap between the clearance hole (101) and the core shaft (10).

9. A method for disassembling a disc scissors blade, characterized in that: A disassembly tool for a disc scissors blade according to any one of claims 1 to 8, the method comprising: The wire rope is connected to the lifting lug and the disassembly tooling of the disc shear blade is lifted; Move the balance plate to be just above the core shaft, with the clearance hole of the balance plate corresponding to the core shaft; The clamping claw is moved to expand the bottom end of the clamping claw outward, and the balancing plate is lowered to allow the core shaft to pass through the clearance hole to release the clamping claw, and the bottom end of the clamping claw is located outside the disc scissors blade; Lowering the balancing plate until the bottom end of the clamping claw is lower than the bottom surface of the disc scissors blade, the clamping claw is retracted and gathered, and the bottom end of the clamping claw extends under the disc scissors blade; The balancing plate is raised, and the claws lift all the disc scissor blades out of the core shaft.

10. The method for disassembling a circular scissors blade according to claim 9, characterized in that: After the step of moving the clamping jaws so that the bottom ends of the clamping jaws are extended outward, lowering the balancing plate so that the core shaft passes through the clearance hole, releasing the clamping jaws, and positioning the bottom ends of the clamping jaws outside the disc scissors blades, and before the step of lowering the balancing plate until the bottom ends of the clamping jaws are lower than the bottom surface of the disc scissors blades, the clamping jaws are retracted and gathered, and the bottom ends of the clamping jaws are extended under the disc scissors blades, the method further includes: The gaps between different sides of the core shaft and the clearance hole are measured, and the horizontal position of the balance plate is adjusted so that the difference in the gaps on different sides is less than a threshold value.

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