A method for debugging zero gap of flying shear blade

Abstract

The present application provides a kind of flying shear blade zero gap debugging method, it is related to flying shear adjusting field, comprising the following steps: the shear blade gap between first shear blade and second shear blade is adjusted to maximum opening degree;According to preset parameter, gradually reduce shear blade gap, after each reduction, use the plug gauge of pre-set specification to detect shear blade gap, until the plug gauge of pre-set specification cannot be inserted into shear blade gap;Coloring indicator is coated on the blade edge working surface of first shear blade;Continue to gradually reduce shear blade gap, after each reduction, observe whether the blade edge working surface of second shear blade appears color transfer mark due to contact with first shear blade;When observing that the blade edge working surface of second shear blade appears color transfer mark, stop shear blade gap adjustment. Through the staged combination strategy of plug gauge coarse adjustment and coloring indicator fine adjustment, the zero position gap calibration accuracy is improved to 0~0.01mm range, and the detection lower limit of 0.05mm of traditional plug gauge method is broken through.

Description

Technical Field

[0001] This invention relates to the field of flying shear adjustment technology, and more specifically, to a method for adjusting the zero-position gap of the flying shear blade. Background Technology

[0002] The flying shear is the core shearing equipment in a continuous cold-rolled strip steel processing production line. Its upper and lower shear blades are mounted on the upper and lower cutter drums, respectively, and the shear blade gap is adjusted by axial movement of the upper cutter drum. Precise control of the shear blade gap directly determines the shearing quality of the strip steel. An excessively large gap will result in burrs, skewed cuts, and excessive dimensional deviations on the sheared surface; an excessively small gap will easily cause blade crushing and scratches and accelerated wear. Therefore, an absolute zero-point reference for the shear blade gap must be established during equipment assembly and shipment. All subsequent working gap adjustments for different specifications of strip steel are based on this zero point. The accuracy of the zero-point calibration directly determines the accuracy of subsequent gap adjustments.

[0003] Existing methods for calibrating shear blade clearance have the following main shortcomings: First, the "zero point" mentioned in existing methods is mostly a relative reference point rather than a physical zero point. For example, defining the position corresponding to a 0.6mm side clearance or a specific reading on a dial indicator as the "zero point" is fundamentally different from the zero point of the clearance when the upper and lower shear blades are actually in contact. Using this as a reference for clearance adjustment will introduce systematic deviations. Second, existing zero-point determination methods are mainly qualitative and lack precision. When the clearance is less than 0.05mm, the feeler gauge method loses its ability to distinguish, and operators can only make a vague judgment based on feel or experience, which is difficult to meet the requirements of high-precision calibration. Third, existing methods have not formed a standardized operating procedure with clear stage transition criteria. The calibration results heavily depend on the operator's personal experience and subjective judgment, resulting in poor consistency of calibration results among different operators, which is difficult to adapt to the requirements of modern production lines for process standardization and product quality consistency. Summary of the Invention

[0004] To solve the above problems, the present invention provides a method for adjusting the zero-position gap of a flying shear blade. The flying shear has a first blade drum and a second blade drum, a first blade is mounted on the first blade drum, and a second blade is mounted on the second blade drum. The adjustment method includes the following steps: Adjust the blade gap between the first and second blades to the maximum opening. The shear blade gap is gradually reduced according to the preset parameters. After each reduction, the shear blade gap is checked with a feeler gauge of the preset specification until the feeler gauge of the preset specification can no longer be inserted into the shear blade gap. A coloring indicator is applied to the working surface of the first shear blade; Continue to gradually reduce the shear blade gap. After each reduction, observe whether the working surface of the second shear blade shows color transfer marks due to contact with the first shear blade. When a color transfer mark is observed on the working surface of the second shear blade, stop adjusting the shear blade gap and determine whether the color transfer mark meets the preset requirements. If yes, determine that the shear blade gap between the first and second shear blades is the zero-position shear blade gap; otherwise, continue to gradually reduce the shear blade gap until the color transfer mark meets the preset requirements.

[0005] Optionally, the coloring indicator is a slurry made by mixing pigment and machine oil, wherein the volume ratio of pigment to machine oil is 3:1 to 5:1.

[0006] Alternatively, the pigment may be red lead powder.

[0007] Optionally, the coating thickness of the coloring indicator is less than 0.01 mm.

[0008] Optionally, the coloring indicator is applied by: using a sponge to apply the coloring indicator paste to the working surface of the first shear blade, and then using a scraper at an angle of 30° to 45° to the blade surface along the length of the shear blade.

[0009] Optionally, the preset requirement for the color transfer mark is a continuous mark, and the coverage length of the continuous mark along the working surface of the second shear blade is greater than 70% of the effective cutting working length.

[0010] Optionally, the coverage length of the continuous color transfer mark is measured along the length of the working surface of the second scissor blade using a vernier caliper, and the contamination ratio is calculated by dividing this length by the effective cutting length of the working surface of the scissor blade.

[0011] Optionally, the preset feeler gauge is a 0.05mm feeler gauge.

[0012] Optionally, before adjusting the blade gap to the maximum opening, the first or second blade drum is moved axially to align the first and second blades in the length direction.

[0013] Optionally, after stopping the shear blade gap adjustment, mark the zero gap position on the dial of the first blade drum or record the dial reading as the absolute zero reference for subsequent shear blade gap adjustments.

[0014] The beneficial effects of the method for adjusting the zero-position gap of the flying shear blade in this invention are: By employing a phased combination strategy of coarse adjustment with feeler gauges and fine adjustment with colored indicators, the zero-point gap calibration accuracy is improved to the range of 0~0.01mm, breaking through the 0.05mm detection limit of the traditional feeler gauge method. This method first uses feeler gauges to converge the gap below the detection limit, then uses the color transfer characteristics of the colored indicator as the contact determination criterion. Pre-defined quantitative criteria ensure the uniformity of the zero point along the entire length, resulting in accurate and reliable calibration without damaging the shear blade. Furthermore, this method uses standardized operating procedures and clear phase transition criteria, does not rely on operator experience, and has good repeatability and operability, providing a reliable zero-point reference for subsequent precise adjustment of the working gap. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the flying shear structure in an embodiment of the present invention; Figure 2 This is a first flowchart of the adjustment method in an embodiment of the present invention; Figure 3 This is a second flowchart of the adjustment method in an embodiment of the present invention; Explanation of reference numerals in the attached figures: 1. First blade drum; 2. Second blade drum; 3. First scissor blade; 4. Second scissor blade. Detailed Implementation

[0016] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0017] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0018] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0019] Example 1 This embodiment provides a method for adjusting the zero-position gap of the flying shear blade.

[0020] Please combine Figure 1 The flying shear has a first blade drum 1 and a second blade drum 2. A first shear blade 3 is mounted on the first blade drum 1, and a second shear blade 4 is mounted on the second blade drum 2. Both the first and second blade drums are cylindrical, and the shear blades are fixedly mounted on the outer circumference of the drum along its axial direction. The distance between the first shear blade 3 and the second shear blade 4 is the shear blade gap, which is adjusted by a gap adjustment mechanism. This mechanism typically employs a worm gear and trapezoidal thread pair structure, driven by a motor to move the first blade drum 1 axially, thereby changing the gap between the upper and lower shear blades.

[0021] Specifically, please combine Figures 2-3 The debugging method includes the following steps: First, adjust the shear blade gap between the first shear blade 3 and the second shear blade 4 to the maximum opening. The maximum opening refers to the maximum distance between the shear blades that the gap adjustment mechanism can achieve. In this state, there is sufficient space for observation and operation between the upper and lower shear blades, which can effectively avoid accidental collisions of the shear blades during the subsequent gradual reduction of the gap, and provide a safe starting point for the entire calibration process.

[0022] Subsequently, the shear blade gap is gradually reduced according to preset parameters. Preset parameters refer to the feed amount for each adjustment operation, which is determined by the control precision of the gap adjustment mechanism. For example, it can be set to an adjustment step of 0.01mm to 0.02mm each time, or a smaller or larger step value can be selected according to the actual working conditions. After each gap reduction, a feeler gauge of preset specifications is inserted into the gap between the upper and lower shear blades for testing. A feeler gauge, also known as a gap gauge, is a thickness measuring tool made of thin sheet stainless steel material; different specifications of feeler gauges correspond to different thickness values. If the feeler gauge can be easily inserted into the gap, it means that the current gap value is still greater than or equal to the feeler gauge's specification value, and the gap needs to be further reduced; if the feeler gauge cannot be inserted into the gap, it means that the current gap value is less than the feeler gauge's specification value, and the coarse adjustment stage is complete.

[0023] After the feeler gauge is used for rough adjustment, a coloring indicator is applied to the working surface of the first shear blade 3. The coloring indicator is a colored substance that, when applied to the surface of an object, can transfer to the opposite surface through contact, thus forming a visible mark. This coloring indicator can be a pigment, dye, or other material with color transfer properties. During application, the coloring indicator must evenly cover the working surface of the first shear blade 3, and the application area should cover the effective cutting length direction of the shear blade.

[0024] After the coloring indicator is applied, the shear blade gap is gradually reduced according to the preset parameters. After each reduction, the operator observes visually or with the aid of a magnifying glass or other auxiliary tools to see if a color transfer mark appears on the working surface of the second shear blade 4 due to contact with the first shear blade 3. When the gap between the upper and lower shear blades gradually decreases until they come into contact, the coloring indicator applied to the working surface of the first shear blade 3 will be transferred to the working surface of the second shear blade 4 due to contact and compression, thus forming a visible color mark on the second shear blade 4, indicating that the upper and lower shear blades have reached a zero-gap state at this contact position.

[0025] When a color transfer mark is observed on the working surface of the second shear blade 4, stop adjusting the shear blade gap and determine whether the color transfer mark meets the preset requirements. The preset requirements refer to the pre-set conditions used to determine whether the color transfer mark represents a valid zero-position calibration. If the color transfer mark meets the preset requirements, the shear blade gap between the first shear blade 3 and the second shear blade 4 is determined to be the shear blade zero-position gap, and the calibration is completed. If the color transfer mark does not meet the preset requirements, it means that although there is local contact, the contact state has not yet reached the zero-position standard of uniformity along the entire length, and it is necessary to continue to gradually reduce the shear blade gap until the color transfer mark meets the preset requirements.

[0026] In this embodiment, the closed-loop judgment logic of "determining whether the preset requirements are met after the mark appears" constitutes a complete termination mechanism: the absence of the feeler gauge ensures that the gap is less than the lower limit of the feeler gauge accuracy; the appearance of the color transfer mark indicates that the shear blade has made actual contact; and the satisfaction of the preset requirements ensures the uniformity of contact along the entire length. The three factors work together in a progressive manner to ultimately achieve a zero-position gap calibration accuracy of 0~0.01mm.

[0027] The technical advantages of this embodiment are as follows: by coarsely adjusting the feeler gauge to reduce the gap to below 0.05mm, and then accurately determining the contact state by using the color transfer characteristics of the color indicator, the combination of the two overcomes the limitation that the single feeler gauge method cannot measure gaps smaller than 0.05mm; the introduction of preset requirements ensures the uniformity of the zero position along the entire length of the shear blade; the whole method does not rely on the operator's subjective experience and has good repeatability and operability.

[0028] Example 2 The difference between this embodiment and Embodiment 1 is that the specific composition of the coloring indicator is further defined.

[0029] In this embodiment, the coloring indicator is a slurry made by mixing pigment and machine oil, wherein the volume ratio of pigment to machine oil is 3:1 to 5:1.

[0030] Pigments are finely powdered coloring substances with a specific color that can be evenly dispersed in a medium. Machine oil, acting as a dispersion medium and carrier, can evenly coat the pigment particles, forming a paste or slurry with a certain degree of fluidity. Pigment and machine oil are mixed at a volume ratio of 3:1 to 5:1. Within this ratio range, the slurry has a suitable consistency—neither too thin (causing it to flow) nor too thick (making it difficult to apply) due to insufficient oil. In practice, the operator places an appropriate amount of pigment in a mixing tray, adds machine oil according to the above ratio, and stirs thoroughly with a mixing knife or stirring rod until the pigment and oil are evenly mixed to form a uniform slurry with consistent color and no dry powder particles before use.

[0031] The advantages of this paste as a coloring indicator are: the oil has a certain degree of adhesion, which allows the pigment to adhere firmly to the surface of the shear blade and not easily fall off; at the same time, the oil has a certain degree of lubrication, which can reduce the wear on the surface of the shear blade when the upper and lower shear blades are in contact; the paste form is easy to apply evenly with tools such as sponges or brushes, and the coating thickness can be precisely controlled by scraping.

[0032] The technical advantages of this embodiment are as follows: after the pigment and machine oil are mixed into a slurry, the adhesion is better than when pigment powder is used alone, and it is not easy to fall off the surface of the scissor blade; the moderate consistency of the slurry ensures that it will not flow and contaminate other parts, nor will it affect the uniformity of coating due to excessive thickness; the machine oil also has a certain lubricating and protective effect on the scissor blade.

[0033] Example 3 The difference between this embodiment and Embodiment 2 is that the specific types of pigments are further limited.

[0034] In this embodiment, the pigment is red lead powder. The chemical name for red lead powder is lead tetroxide, a reddish-orange powder pigment. Red lead powder is characterized by its bright color, strong covering power, fine particle size, and good adhesion. It has a long history of application in color inspection in the machining field, and its color transfer characteristics are well-known to those skilled in the art—when a workpiece coated with red lead powder comes into contact with a workpiece on the opposite side, the red lead powder will transfer from the contact point to the opposite surface, forming a clearly visible red mark. This red mark is particularly noticeable under oblique light, making it easy for operators to visually identify.

[0035] The specific procedure for using red lead powder as a pigment is as follows: Red lead powder and machine oil are thoroughly mixed into a uniform slurry according to the proportions described in Example 2, and then coated onto the working surface of the first shear blade 3 following the steps described in Example 1. When the second shear blade 4 comes into contact with the first shear blade 3, the red lead powder slurry will transfer from the first shear blade 3 to the second shear blade 4 due to contact and pressure, forming a continuous red mark on the working surface of the second shear blade 4.

[0036] The technical advantages of this embodiment are as follows: the red lead powder has a bright color, and the red mark it forms on the surface of the shear blade has extremely high visual recognition, and can be clearly identified even in low-light environments; the red lead powder particles are fine, and after being mixed with machine oil, they can form a uniform film on the surface of the shear blade, which is beneficial for achieving coating thickness control of less than 0.01mm; red lead powder has mature applications in the field of industrial testing, and the material is readily available and inexpensive.

[0037] Example 4 The difference between this embodiment and Embodiment 2 is that the coating thickness of the coloring indicator is further limited.

[0038] In this embodiment, the coating thickness of the coloring indicator is less than 0.01 mm. The coating thickness refers to the dimension of the coating formed by the coloring indicator on the working surface of the shear blade along the direction perpendicular to the blade surface.

[0039] To achieve a coating thickness of less than 0.01 mm, the following procedure can be used: Apply the prepared coloring indicator slurry to the shear blade surface in small, multiple applications. After each application, use a scraper to evenly spread the slurry along the length of the shear blade, maintaining an appropriate angle between the scraper and the blade surface. The excess slurry is removed from the blade surface by the squeezing action of the scraper, leaving only a very thin, continuous film. If necessary, repeat the scraping process multiple times until the coating is thin enough to appear translucent to the naked eye or only show uniform coloring without any accumulation. After coating, if thickness verification is required, a coating thickness gauge such as an eddy current thickness gauge or a magnetic thickness gauge can be used to select multiple measurement points along the length of the shear blade for testing, ensuring that the readings at each measurement point are less than 0.01 mm.

[0040] The significance of controlling the coating thickness to below 0.01mm is that if the coating is too thick, the colored indicator may shift due to compression before the upper and lower shear blades actually make contact, leading the operator to misjudge that contact has occurred. This causes the calibrated "zero point" to deviate from the true physical zero point, introducing systematic errors. Controlling the coating thickness to less than 0.01mm, which is far below the upper limit of the final zero-point calibration accuracy range of 0~0.01mm, ensures that even if the colored indicator shifts slightly before contact, its impact on the zero-point calibration accuracy is within an acceptable range, preventing false contact misjudgments.

[0041] The technical advantage of this embodiment is that the coating thickness of less than 0.01mm eliminates the possibility of false contact caused by excessive coating thickness, ensuring that the appearance of color transfer marks truly corresponds to the physical contact between the upper and lower shear blades, thereby ensuring the accuracy of zero-position calibration.

[0042] Example 5 The difference between this embodiment and Embodiment 4 is that the method of applying the coloring indicator is further specified.

[0043] In this embodiment, the method for applying the coloring indicator is as follows: the coloring indicator slurry is applied to the working surface of the first shear blade 3 with a sponge, and then scraped along the length of the shear blade with a scraper at an angle of 30° to 45° to the blade surface.

[0044] The specific operating steps are as follows: First, take a clean sponge block, such as ordinary industrial sponge or polyurethane sponge, dip the sponge block into the evenly mixed coloring indicator paste, and then gently squeeze it at the edge of the color palette to remove excess paste absorbed by the sponge, leaving only a thin and uniform paste layer on the sponge surface. Then, the operator uses the sponge to wipe along the length of the working surface of the first shear blade 3, maintaining a consistent wiping direction, so that the paste initially adheres to the entire shear blade surface.

[0045] After wiping, use a special scraper for scraping. The scraper can be a hard rubber scraper or a flexible plastic scraper, with a smooth, even blade without any nicks. The operator should maintain a 30° to 45° angle between the scraper blade and the working surface of the shear blade, scraping at a uniform speed once or multiple times along the length of the shear blade. The scraper's working mechanism is as follows: within the wedge-shaped area formed by the scraper blade and the shear blade surface, the slurry is subjected to compression and shearing. Excess slurry is pushed forward by the scraper and eventually discharged from both ends of the shear blade, while the slurry remaining on the shear blade surface is smoothed by the scraper blade and forms a uniform film. A scraper angle between 30° and 45° provides sufficient scraping pressure to thin the coating without scratching the shear blade surface due to an excessively large angle.

[0046] The technical advantages of this embodiment are as follows: the sponge is soft and will not damage the surface of the shear blade; its porous structure can absorb and uniformly release the slurry; the scraper coating can precisely control the coating thickness and uniformity, ensuring that the coating thickness is less than 0.01mm; the two-step method is simple to operate and has good repeatability, and different operators can obtain consistent coating results by following the same method.

[0047] Example 6 The difference between this embodiment and Embodiment 1 is that the preset requirements for the color transfer mark are further limited.

[0048] In this embodiment, the preset requirement for the color transfer mark is that the color transfer mark is a continuous mark, and the coverage length of the continuous mark along the working surface of the second shear blade 4 is greater than 70% of the effective shearing working length.

[0049] The effective shearing working length refers to the length of the strip steel actually sheared by the second shear blade 4, excluding the non-working areas or chamfered areas at both ends of the shear blade. When the upper and lower shear blades come into contact, the coloring indicator applied to the first shear blade 3 is transferred to the surface of the second shear blade 4. If the contact occurs evenly distributed throughout the entire effective working length of the shear blade, a continuous red mark extending along the length direction will be formed on the second shear blade 4. If the shear blade gap is not evenly distributed along the length direction, there may be some areas in contact and some areas still having gaps. In this case, the color transfer mark will show an intermittent distribution—the contact area has a mark, and the non-contact area has no mark.

[0050] The coverage length of the continuous markings is obtained by measuring along the length of the working surface of the second shear blade 4. Starting from one end of the second shear blade 4, the operator observes the distribution of the red markings segment by segment along the length, recording the continuous length from the first marking to the last. If there is an interruption in the markings, the longest continuous marking segment is used as the measurement object. This continuous length is compared with the effective shearing length to calculate the coverage ratio. When the coverage length of the continuous markings is greater than 70% of the effective shearing length, it indicates that the upper and lower shear blades have reached contact in most of the effective shearing range, and the uniformity of the gap along the entire length meets the zero-position calibration requirements.

[0051] Setting the preset requirement of continuous imprint coverage length greater than 70% is based on the following considerations: If only imprints are required without continuity, the shear blade may only make contact at local points while leaving large gaps in other areas, and the calibrated zero point may not represent the true zero point along the entire length; if 100% full coverage is required, it may be difficult to achieve in actual operation due to factors such as shear blade manufacturing tolerances and assembly errors, and repeated adjustments may prolong calibration time or even damage the shear blade. 70% is a reasonable threshold that comprehensively balances calibration accuracy and operational feasibility.

[0052] The technical advantages of this embodiment are: by determining both continuity and coverage length, the uniformity of the zero gap along the entire length of the shear blade is ensured, avoiding misjudgment caused by local contact; the 70% threshold setting balances calibration accuracy and the feasibility of actual operation.

[0053] Example 7 The difference between this embodiment and Embodiment 6 is that the method for measuring the coverage length of the color transfer mark is further defined.

[0054] In this embodiment, a vernier caliper is used to measure the coverage length of the continuous color transfer mark along the length of the working surface of the second shear blade 4. The staining ratio is calculated by dividing this length by the effective cutting working length of the working surface of the shear blade.

[0055] A vernier caliper is a precision measuring tool consisting of a main scale and a vernier scale that slides along the main scale. It is used to accurately measure the length of an object. During measurement, the operator holds the vernier caliper, aligns the measuring face along the length of the second shear blade 4, and measures from the first location where a continuous red mark appears to the last location where a continuous red mark appears. The length reading on the vernier caliper is the length covered by the continuous color transfer mark.

[0056] After measurement, divide the coverage length by the effective cutting length of the second shear blade 4 to obtain the contamination ratio. For example, if the measured continuous mark coverage length is 700mm and the effective cutting length of the second shear blade 4 is 1000mm, the contamination ratio is 70%. Compare this ratio with the preset requirement (greater than 70%) to determine if the calibration completion condition is met. If it is met, stop gap adjustment and determine that the zero-point calibration is complete; if not, continue to reduce the gap.

[0057] Vernier calipers typically have an accuracy of 0.02 mm, which is sufficient to meet the accuracy requirements for measuring the coverage length. During measurement, ensure that the vernier caliper is parallel to the length direction of the shear blade to avoid tilting, which could lead to measurement errors.

[0058] The technical advantages of this embodiment are: the vernier caliper has high measurement accuracy and intuitive readings, and can provide accurate length values ​​for proportional calculations, so that the judgment of the contamination ratio has a precise quantitative basis, overcoming the subjective errors that may exist in visual estimation.

[0059] Example 8 The difference between this embodiment and Embodiment 1 is that the preset specifications of the feeler gauge are further defined.

[0060] In this embodiment, the preset specification of the feeler gauge is a 0.05mm feeler gauge. The feeler gauge is composed of a set of thin plates of different thicknesses, each plate being marked with its precise thickness value; the 0.05mm specification means that the plate is 0.05mm thick.

[0061] 0.05mm is one of the standard specifications in a typical feeler gauge kit, and it is also the engineering limit by which the feeler gauge method can reliably determine the gap status in field operations. When the gap is greater than 0.05mm, the operator can clearly determine by hand that the feeler gauge can be inserted; when the gap is less than 0.05mm, the feeler gauge cannot be inserted, indicating that the gap is less than 0.05mm.

[0062] Setting the termination criterion for the coarse adjustment stage as "a 0.05mm feeler gauge cannot be inserted" is technically significant because 0.05mm is the reliable threshold for the feeler gauge method, serving as both the coarse adjustment endpoint and the fine adjustment starting point with clear and highly operable advantages. This stage uses the feeler gauge to quickly converge the gap from the macroscopic dimension to below 0.05mm, providing a reliable starting condition for subsequent fine adjustment of the color indicator. If the gap at the coarse adjustment endpoint is too large (e.g., >0.1mm), subsequent fine adjustment requires more adjustments, reducing efficiency; if the coarse adjustment endpoint is set too small (e.g., 0.02mm), the feeler gauge method can no longer reliably determine the gap. 0.05mm is the optimal matching point for the capabilities of the two detection methods.

[0063] The technical advantages of this embodiment are as follows: using a 0.05mm feeler gauge as the coarse adjustment criterion has the advantages of simple operation, clear judgment, and no need for auxiliary equipment; this specification is a commonly used specification in standard feeler gauge kits, and the material is readily available; the 0.05mm threshold and the subsequent fine adjustment with the coloring indicator form a good connection, and the phased approximation strategy is reasonable.

[0064] Example 9 The difference between this embodiment and Embodiment 1 is that an axial alignment pre-step is added.

[0065] In this embodiment, before adjusting the shear blade gap to the maximum opening, the first blade drum 1 or the second blade drum 2 is moved along the axial direction so that the first shear blade 3 and the second shear blade 4 are aligned in the length direction.

[0066] The purpose of axial alignment is to eliminate axial misalignment between the upper and lower shear blades caused by factors such as accumulated assembly tolerances and the influence of the helix angle of the helical gear pair. If there is axial misalignment between the upper and lower shear blades, when the gap decreases, only the two shear blades in the overlapping misalignment area may come into contact, while the shear blade sections outside the misalignment area will still have a gap. In this case, the red lead powder contamination length only reflects the contact situation in the overlapping area and cannot truly reflect the uniformity of the gap along the entire length of the shear blade, resulting in a distortion in the measurement of the contamination length ratio.

[0067] The specific alignment operation can be performed as follows: Set dial indicators or leveling blocks at both ends of the flying shear. Determine the misalignment by measuring the axial distance between the upper and lower shear blade end faces and the blade drum end face. Then, drive the blade drum axial movement mechanism (usually a worm gear mechanism) to move the first blade drum 1 or the second blade drum 2 until the measurement readings at both ends are consistent. Alternatively, refer to the axial reference scale marked on the flying shear at the factory for alignment adjustment. After alignment, the axial relative positions of the first shear blade 3 and the second shear blade 4 are consistent with the theoretical design positions. At this point, the determination of the contamination length is based on the effective contact area within the entire length of the shear blades, and the measurement results are representative.

[0068] The technical advantage of this embodiment is that axial alignment eliminates the influence of shear blade misalignment on the contamination length measurement results, ensuring that the judgment is based on the effective contact area of ​​the entire shear blade length, thus improving the accuracy and reliability of the calibration results.

[0069] Example 10 The difference between this embodiment and Embodiment 1 is that the zero-point reference recording step is added.

[0070] In this embodiment, after stopping the adjustment of the shear blade gap, the zero gap position is marked on the dial of the first blade drum 1 or the dial reading is recorded as the absolute zero reference for subsequent adjustment of the shear blade gap.

[0071] The gap adjustment mechanism of flying shears is usually equipped with a dial, which is installed at the end of the first blade drum 1 or the operating end of the adjustment mechanism to indicate the adjustment amount of the blade gap. When the operator rotates the adjustment handwheel or drives the adjustment motor, the pointer moves on the dial, and the corresponding scale value reflects the change in the blade gap.

[0072] After zero-point calibration, the operator marks the current pointer position on the dial as the zero-gap position, or records the current dial reading. This mark or reading is the absolute zero-point reference. During subsequent working gap adjustment, the operator uses this zero-point reference as a starting point and adjusts from the zero position towards the positive gap direction according to the adjustment amount corresponding to the target working gap value (e.g., 8%~10% of the strip thickness), thus accurately setting the required working gap.

[0073] Since there is a definite correspondence between the dial reading and the shear blade clearance, such as that determined by the transmission ratio of the worm gear and the lead of the threaded pair, after recording the dial reading corresponding to the zero position, all subsequent clearance adjustments can be performed based on the dial reading without repeating the zero position calibration.

[0074] The technical advantage of this embodiment is that by recording the zero-point reference, the calibration results of this invention can be used continuously throughout the entire life cycle of the equipment. Operators only need to calibrate once and can repeatedly use the zero-point reference in subsequent production to make precise adjustments to the working gap, thereby improving production efficiency and product quality consistency.

[0075] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A method for adjusting the zero-position gap of a flying shear blade, the flying shear having a first blade drum (1) and a second blade drum (2), a first blade (3) being mounted on the first blade drum (1), and a second blade (4) being mounted on the second blade drum (2), characterized in that, The debugging method includes the following steps: Adjust the shear blade gap between the first shear blade (3) and the second shear blade (4) to the maximum opening. The shear blade gap is gradually reduced according to preset parameters. After each reduction, the shear blade gap is checked with a feeler gauge of preset specifications until the feeler gauge of preset specifications can no longer be inserted into the shear blade gap. A coloring indicator is applied to the working surface of the cutting edge of the first shear blade (3); Continue to gradually reduce the gap between the shear blades. After each reduction, observe whether the working surface of the cutting edge of the second shear blade (4) shows a color transfer mark due to contact with the first shear blade (3). When a color transfer mark is observed on the working surface of the cutting edge of the second shear blade (4), the shear blade gap adjustment is stopped and it is determined whether the color transfer mark at this time meets the preset requirements. If yes, the shear blade gap between the first shear blade (3) and the second shear blade (4) at this time is determined to be the zero-position gap of the shear blade; otherwise, the shear blade gap is gradually reduced until the color transfer mark meets the preset requirements.

2. The method for adjusting the zero-position gap of the flying shear blade according to claim 1, characterized in that, The coloring indicator is a slurry made by mixing pigment and machine oil, wherein the volume ratio of the pigment to the machine oil is 3:1 to 5:

1.

3. The method for adjusting the zero-position gap of the flying shear blade according to claim 2, characterized in that, The pigment is red lead powder.

4. The method for adjusting the zero-position gap of the flying shear blade according to claim 2, characterized in that, The coating thickness of the coloring indicator is less than 0.01 mm.

5. The method for adjusting the zero-position gap of the flying shear blade according to claim 4, characterized in that, The method for applying the coloring indicator is as follows: dip a sponge in the coloring indicator slurry and rub it on the working surface of the first shear blade (3), and then scrape it along the length of the shear blade with a scraper at an angle of 30° to 45° to the blade surface.

6. The method for adjusting the zero-position gap of the flying shear blade according to claim 1, characterized in that, The preset requirement for the color transfer mark is that it is a continuous mark, and the coverage length of the continuous mark along the working surface of the second shear blade (4) is greater than 70% of the effective shearing working length.

7. The method for adjusting the zero-position gap of the flying shear blade according to claim 6, characterized in that, Use a vernier caliper to measure the coverage length of the continuous color transfer mark along the length of the working surface of the second shear blade (4), and divide this length by the effective cutting working length of the working surface of the blade to calculate the contamination ratio.

8. The method for adjusting the zero-position gap of the flying shear blade according to claim 1, characterized in that, The default feeler gauge is 0.05mm.

9. The method for adjusting the zero-position gap of the flying shear blade according to claim 1, characterized in that, Before adjusting the shear blade gap to the maximum opening, the first blade drum (1) or the second blade drum (2) is moved along the axial direction so that the first blade (3) and the second blade (4) are aligned in the length direction.

10. The method for adjusting the zero-position gap of the flying shear blade according to claim 1, characterized in that, After stopping the shear blade gap adjustment, mark the zero gap position on the dial of the first blade drum (1) or record the dial reading as the absolute zero reference for subsequent shear blade gap adjustment.

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