Automatic adjustment device and method for crank rocker type flying shear blade gap

Abstract

The present application relates to metal rolling shearing equipment technical field, propose a crank rocker type flying shear blade gap automatic adjusting device and method, for adjusting the gap between the upper shear blade and the lower shear blade fixed on the upper tool holder and the lower tool holder respectively, the upper tool holder and the lower tool holder are connected through eccentric hinge shaft, the crank rocker type flying shear blade gap automatic adjusting device includes: connecting rod, one end is fixed on the eccentric hinge shaft, the other end of the connecting rod is provided with screw nut pair;Fixed seat, fixed on the upper tool holder or the lower tool holder, the fixed seat is provided with rotatable positioning shaft;Adjusting screw, one end is rotatably connected with the screw nut pair through thread, the adjusting screw is rotatably arranged on the positioning shaft, the adjusting screw is provided with driving part that can drive it to rotate.The present application can solve the problems of large operation difficulty, long time consumption and poor adjustment precision in the process of manual adjustment of flying shear blade gap.

Description

Technical Field

[0001] This invention relates to the field of metal rolling and shearing equipment technology, and in particular to an automatic adjustment device and method for the blade gap of a crank-rocker type flying shear. Background Technology

[0002] Currently, there is a significant increase in new capacity and production lines for high-performance cold-rolled sheet mills (such as galvanizing, continuous annealing, and pickling), and the performance of these products is continuously improving, extending from general building materials to high-value-added end products such as automotive and home appliance steel sheets, zinc-aluminum-magnesium steel, and silicon steel. The production of high-performance cold-rolled sheet can process a wide range of steel sheet thicknesses, typically from 0.2mm to 6mm.

[0003] During the operation of the aforementioned cold-rolled sheet mill, for the purpose of strip performance testing and removing strip head and tail defects, it is necessary to use flying shears to perform multiple shearing operations on the strip during the coil operation, including coil shearing, sampling shearing, and scrap shearing. The shearing quality requirements are high, and the minimum requirement is that when performing continuous multi-blade shearing at the shearing process speed, it is possible to achieve complete cutting with a smooth and flat cut.

[0004] To ensure that the above-mentioned shearing quality requirements are met, when flying shears are used to shear strip steel, the shear blade gap must have high precision and should be adjusted according to the thickness of the strip steel. The shear blade gap is usually set to about 8% to 10% of the strip steel thickness.

[0005] There are two types of flying shears used in cold rolling sheet mills. One type is the rotary drum flying shear, which requires multiple blades to be mounted on the same cutter shaft when multiple cuts are needed. This type requires high precision, is difficult to manufacture, and is inconvenient to use and maintain. The other type is the crank-rocker flying shear, which is more suitable when multiple cuts are needed continuously. Crank-rocker flying shears are generally used in mills with medium to low process shearing speeds and extremely high requirements for production process stability, such as galvanizing, continuous annealing, and acid leveling mills.

[0006] The existing crank-rocker flying shear blade gap adjustment device is manually adjustable, with a blade gap adjustment mechanism at each end of the blade holder. Simultaneous manual adjustment from both sides is required, followed by confirmation with a feeler gauge. If the adjustment fails to meet requirements, readjustment is necessary, resulting in a lengthy process. Inconsistent gap adjustments on both sides can affect the uniformity of the blade gap, leading to incomplete cutting of the strip or blade interference / collision accidents. Furthermore, the manual gap adjustment mechanism cannot be calibrated after adjustment; therefore, a complete manual adjustment and confirmation process is required whenever the strip thickness changes. In addition to these drawbacks, the limited space within the unit and the limited operating space make manual adjustment difficult, often resulting in poor gap adjustment accuracy. Summary of the Invention

[0007] The purpose of this invention is to provide a crank-rocker type flying shear blade gap automatic adjustment device and method, which solves the problems of high operation difficulty, long time consumption and poor adjustment accuracy in the current manual adjustment process of flying shear blade gap.

[0008] The above-mentioned technical objectives of this invention are mainly achieved through the following technical solutions: On one hand, the present invention provides a crank-rocker type flying shear blade gap automatic adjustment device for adjusting the gap between the upper and lower shear blades, which are respectively fixed on the upper and lower blade holders. The upper and lower blade holders are connected by an eccentric hinge shaft. The crank-rocker type flying shear blade gap automatic adjustment device includes: A connecting rod, one end of which is fixed on the eccentric hinge shaft, and the other end of which is provided with a lead screw and nut pair; A fixed base is fixed on the upper tool post or the lower tool post, and the fixed base is provided with a rotatable positioning shaft; An adjusting screw is provided, one end of which is rotatably connected to the screw nut pair via a thread, and the other end of the adjusting screw is rotatably mounted on the positioning shaft. The adjusting screw is provided with a driving component that can drive it to rotate.

[0009] The crank-rocker type flying shear blade gap automatic adjustment device of the present invention adopts a ball screw structure to control the rotation of the eccentric hinge shaft, and the gap between the adjusting screw and the screw nut pair is small, with high adjustment accuracy.

[0010] The crank-rocker type flying shear blade gap automatic adjustment device of the present invention has a driving component on the adjusting screw to drive its rotation. It adopts electric drive or hydraulic drive, and the adjustment speed is fast. The gap can be automatically adjusted through an external control unit, avoiding manual operation.

[0011] In a preferred embodiment of the present invention, the adjusting screw is provided with an absolute encoder, the absolute encoder is electrically connected to a control unit, and the control unit is electrically connected to the driving component. The control unit can control the drive component to rotate according to the pre-calibrated encoding data in the absolute encoder, so as to drive the adjusting screw to rotate and adjust the gap between the upper and lower shear blades.

[0012] In this embodiment, a high-precision absolute encoder is used to detect and calibrate the position of different gap values ​​of the shear blade. When the desired gap value is to be selected, the control unit only needs to control the drive component to rotate. When the rotation reaches the position corresponding to the gap memorized by the absolute encoder, the control unit stops rotating. This avoids human error during manual adjustment, and both the adjustment speed and accuracy are improved.

[0013] In a preferred embodiment of the present invention, the axis of the eccentric hinge shaft is parallel to the axis of the positioning rotating shaft, and the axis of the adjusting screw is perpendicular to the axis of the positioning rotating shaft.

[0014] In a preferred embodiment of the present invention, the adjusting screw is provided with a threaded section and a driving section. The threaded section is provided with a thread that mates with the screw nut pair. The driving section passes through the positioning shaft. The driving component and the absolute encoder are both located in the driving section.

[0015] In a preferred embodiment of the present invention, a sliding bearing is provided between the adjusting screw and the positioning shaft.

[0016] In a preferred embodiment of the present invention, a connecting flange is sleeved on the adjusting screw, one end of the connecting flange is connected to the positioning shaft, and the other end of the connecting flange is connected to the housing of the driving component.

[0017] In a preferred embodiment of the present invention, the absolute encoder is disposed at the end of the adjusting screw, the housing of the absolute encoder is connected to the housing of the drive member, and the adjusting screw is connected to the grating code disk inside the absolute encoder via a connecting shaft.

[0018] In a preferred embodiment of the present invention, the end of the connecting rod connected to the adjusting screw is provided with a pin, the screw nut pair is connected to the pin, the pin is provided with a through hole coaxial with the screw nut pair, and the adjusting screw passes through the through hole.

[0019] In a preferred embodiment of the present invention, the driving component is a geared motor, a servo motor, or a hydraulic motor.

[0020] On the other hand, the present invention also provides an automatic adjustment method for the blade gap of a crank-rocker type flying shear, wherein the adjustment method is implemented using the crank-rocker type flying shear blade gap automatic adjustment device as described above, and the crank-rocker type flying shear blade gap automatic adjustment method includes a calibration process and an adjustment process; The calibration process includes the following steps: Step S1: Adjust the gap between the flying shear blades to the predetermined gap value using the automatic gap adjustment device; Step S2: Record the position of the grating code disk corresponding to the absolute encoder (31) when it is at the predetermined gap value; Step S3: Input and store the correspondence between the predetermined gap value and the position of the grating code disk in the control unit; Step S4: Repeat the above process until all predetermined gap values ​​are calibrated to form a gap value-grating code disk position database in the control unit; The adjustment process includes the following steps: Step S5: Input the thickness of the strip to be sheared into the control unit; Step S6: The control unit retrieves the corresponding predetermined gap value according to the pre-stored strip thickness-gap value database; Step S7: The control unit retrieves the corresponding grating code disk position based on the gap value-grating code disk position database; Step S8: The control unit controls the drive (30) to rotate to the calibration position corresponding to the absolute encoder (31) according to the position of the grating code disk, so as to adjust the flying shear blade gap to the predetermined gap value.

[0021] The automatic adjustment method for the blade gap of a crank-rocker type flying shear described in this invention is implemented using the aforementioned automatic adjustment device for the blade gap of a crank-rocker type flying shear. It employs a combination structure of a ball screw structure and an absolute encoder. First, the blade gap of the flying shear is calibrated, and then, during the actual gap adjustment process, it is quickly adjusted to the required gap value based on the calibration data. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0023] Figure 1 This is a schematic diagram of the automatic adjustment device for the blade gap of the crank-rocker type flying shear described in this invention; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction.

[0024] Explanation of reference numerals in the attached figures: 10. Upper blade holder; 11. Upper shear blade; 12. Lower blade holder; 13. Lower shear blade; 14. Housing; 15. Eccentric hinge shaft; 20. Connecting rod; 21. Fixed seat; 22. Positioning shaft; 23. Adjusting screw; 24. Screw and nut pair; 25. Bushing; 26. Sliding bearing; 27. Connecting flange; 28. Pin; 29. ​​Key; 30. Drive unit; 31. Absolute encoder; 32. Connecting shaft. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0026] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] Implementation Method 1: like Figure 1 and Figure 2 As shown, the present invention provides a crank-rocker type flying shear blade gap automatic adjustment device for adjusting the gap between the upper shear blade 11 and the lower shear blade 13, which are respectively fixed on the upper blade holder 10 and the lower blade holder 12. The upper blade holder 10 and the lower blade holder 12 are connected by an eccentric hinge shaft 15. The crank-rocker type flying shear blade gap automatic adjustment device includes: a connecting rod 20, one end of which is fixed on the eccentric hinge shaft 15, and the other end of the connecting rod 20 is provided with a screw nut pair 24; a fixed seat 21, which is fixed on the upper blade holder 10 or the lower blade holder 12, and the fixed seat 21 is provided with a rotatable positioning shaft 22; and an adjusting screw 23, one end of which is rotatably connected to the screw nut pair 24 by a thread, and the other end of the adjusting screw 23 is rotatably passed through the positioning shaft 22. The adjusting screw 23 is provided with a driving member 30 that can drive it to rotate.

[0029] The crank-rocker type flying shear blade gap automatic adjustment device of the present invention uses a ball screw structure to control the rotation of the eccentric hinge shaft 15, and the gap between the adjusting screw 23 and the screw nut pair 24 is small, with high adjustment accuracy.

[0030] The crank-rocker type flying shear blade gap automatic adjustment device of the present invention has a driving component 30 on the adjusting screw 23 to drive its rotation. It adopts electric drive or hydraulic drive, and the adjustment speed is fast. The gap can be automatically adjusted through an external control unit, avoiding manual operation.

[0031] It should be noted that the crank-rocker type flying shear also includes a main drive mechanism (not shown in the figure) that drives the upper and / or lower blade holders to perform shearing motion, and the automatic gap adjustment device is used to adjust the blade gap in non-shearing working state.

[0032] The following will provide a detailed description of the specific structure of each part of the crank-rocker type flying shear blade gap automatic adjustment device described in this invention, as well as the position and connection relationship between each part.

[0033] First, a brief explanation of the structure of the crank-rocker type flying shear blade will be given, such as... Figure 1 As shown, it includes an upper shear blade 11 and a lower shear blade 13 that are opposite each other. The upper shear blade 11 is mounted on the upper blade holder 10, and the lower shear blade 13 is mounted on the lower blade holder 12. The upper blade holder 10 and the lower blade holder 12 are connected by an eccentric hinge shaft 15. By rotating the eccentric hinge shaft 15, the distance between the upper blade holder 10 and the lower blade holder 12 can be changed, thereby changing the gap between the upper shear blade 11 and the lower shear blade 13.

[0034] The crank-rocker type flying shear blade gap automatic adjustment device of the present invention includes a connecting rod 20 installed on the eccentric hinge shaft 15. The connecting rod 20 can drive the eccentric hinge shaft 15 to rotate together. Specifically, one end of the connecting rod 20 can be fixed to the eccentric hinge shaft 15 by welding or screw connection.

[0035] like Figure 1 and Figure 2 As shown, the other end of the connecting rod 20 is connected to an adjusting screw 23 that can drive its rotation. A pin 28 is provided at the end of the connecting rod 20 connected to the adjusting screw 23. The pin 28 is assembled in the connecting rod 20 with an appropriate clearance to ensure that the pin 28 can rotate relative to the connecting rod 20. A screw nut pair 24 is bolted to the pin 28. A through hole coaxial with the screw nut pair 24 is provided on the pin 28, and the adjusting screw 23 passes through both the through hole and the screw nut pair 24. The thread on the adjusting screw 23 can connect with the screw nut pair 24. A clearance is provided between the adjusting screw 23 and the through hole on the pin 28 to ensure that the adjusting screw 23 can move and rotate relative to the pin 28.

[0036] Furthermore, such as Figure 2 As shown, the adjusting screw 23 is provided with a threaded section and a driving section, wherein the threaded section ( Figure 2 The left half of the adjusting screw 23 is provided with threads that mate with the screw nut pair 24, and the drive section ( Figure 2 The right half of the adjusting screw 23 is rotatably connected to the upper tool post 10 or the lower tool post 12; in this embodiment, as... Figure 1 As shown, the end of the adjusting screw 23 furthest from the connecting rod 20 is connected to the lower tool post 12 via the fixed seat 21 and the positioning shaft 22.

[0037] Specifically, such as Figure 2 As shown, a fixed base 21 is mounted on the lower tool holder 12. A rotatable positioning shaft 22 is connected to the fixed base 21. The positioning shaft 22 has a through hole, through which the drive section of the adjusting screw 23 passes. A bushing 25 and a connecting flange 27 are respectively provided on both sides of the through hole, and the bushing 25 and the connecting flange 27 are respectively fitted onto the adjusting screw 23. One end of the bushing 25 abuts against the positioning shoulder on the adjusting screw 23, and the other end abuts against the positioning shaft 22. One end of the connecting flange 27 is fixed to the positioning shaft 22 by bolts. There are gaps between the adjusting screw 23 and the bushing 25, the through hole on the positioning shaft 22, and the connecting flange 27, and they can rotate relative to each other.

[0038] Furthermore, such as Figure 2 As shown, in order to drive the adjusting screw 23 to rotate, a driving component 30 is provided on the other side of the connecting flange 27. The driving component 30 is sleeved on the adjusting screw 23, and the driving section of the adjusting screw 23 passes through the hollow shaft of the driving component 30. A key 29 is provided to transmit torque, thereby enabling the driving component 30 to drive the adjusting screw 23. The housing of the driving component 30 is connected to the connecting flange 27 to fix the driving component 30.

[0039] Preferably, the drive unit 30 can be a geared motor, a servo motor, or a hydraulic motor.

[0040] Furthermore, such as Figure 2 As shown, a sliding bearing 26 is provided between the adjusting screw 23 and the positioning shaft 22; the sliding bearing 26 is located in the through hole on the positioning shaft 22, and the sliding bearing 26 enables the adjusting screw 23 to rotate more smoothly relative to the positioning shaft 22.

[0041] The following will further explain the structure and technical effects of the preferred embodiment of the crank-rocker type flying shear blade gap automatic adjustment device of the present invention.

[0042] According to one embodiment of the present invention, such as Figure 1 and Figure 2As shown, an absolute encoder 31 is provided on the adjusting screw 23. The absolute encoder 31 is electrically connected to a control unit (not shown in the figure), and the control unit is electrically connected to the drive unit 30. The control unit can control the drive unit 30 to rotate according to the pre-calibrated encoding data in the absolute encoder 31, so as to drive the adjusting screw 23 to rotate and adjust the gap between the upper shear blade 11 and the lower shear blade 13.

[0043] A high-precision absolute encoder 31 is used to detect and calibrate the position of different gap values ​​of the shear blade. When the desired gap value is to be selected, the control unit only needs to control the drive component 30 to rotate. When the rotation reaches the position corresponding to the gap memorized by the absolute encoder 31, the control unit can stop the drive component 30. This avoids human error during manual adjustment and improves both adjustment speed and accuracy.

[0044] Specifically, such as Figure 2 As shown, the absolute encoder 31 is located at the end of the adjusting screw 23. The housing of the absolute encoder 31 is connected to the housing of the drive component 30. The adjusting screw 23 is connected to the grating code disk inside the absolute encoder 31 via the connecting shaft 32. The control unit can be a PLC controller to control the absolute encoder 31.

[0045] According to one embodiment of the present invention, such as Figure 1 As shown, the axis of the eccentric hinge shaft 15 is parallel to the axis of the positioning shaft 22, and the axis of the adjusting screw 23 is perpendicular to the axis of the positioning shaft 22.

[0046] Implementation Method Two: The present invention also provides an automatic adjustment method for the blade gap of a crank-rocker type flying shear. The adjustment method is implemented using the automatic adjustment device for the blade gap of a crank-rocker type flying shear as described in Embodiment 1. The automatic adjustment method for the blade gap of a crank-rocker type flying shear includes a calibration process and an adjustment process. The calibration process includes the following steps: Step S1: Adjust the gap between the flying shear blades to the predetermined gap value using the automatic gap adjustment device; Step S2: Record the position of the grating code disk corresponding to the absolute encoder 31 when it is at the predetermined gap value; Step S3: Input and store the correspondence between the predetermined gap value and the position of the grating code disk in the control unit; Step S4: Repeat the above process until all predetermined gap values ​​are calibrated to form a gap value-grating code disk position database in the control unit; The adjustment process includes the following steps: Step S5: Input the thickness of the strip to be sheared into the control unit; Step S6: The control unit retrieves the corresponding predetermined gap value according to the pre-stored strip thickness-gap value database; Step S7: The control unit retrieves the corresponding grating code disk position based on the gap value-grating code disk position database; Step S8: The control unit controls the drive unit 30 to rotate to the calibration position corresponding to the absolute encoder 31 according to the position of the grating code disk, so as to adjust the flying shear blade gap to the predetermined gap value.

[0047] The gap value-grating code disk position database is a one-to-one correspondence table between the flying shear blade gap value obtained during the calibration process and the grating code disk position in the absolute encoder 31; the strip thickness-gap value database is a one-to-one correspondence table between the strip thickness and the flying shear blade gap value pre-stored in the control unit. Different gap values ​​are required when cutting strips of different thicknesses. Those skilled in the art can set the above correspondence according to actual needs. The correspondence between the two is common knowledge in the field and will not be described in detail here.

[0048] The automatic adjustment method for the blade gap of a crank-rocker type flying shear described in this invention is implemented using the aforementioned automatic adjustment device for the blade gap of a crank-rocker type flying shear. It employs a combination structure of a ball screw structure and an absolute encoder 31. First, the blade gap of the flying shear is calibrated, and then, during the actual gap adjustment process, it is quickly adjusted to the required gap value based on the calibration data.

[0049] Specifically, in a galvanizing unit, if the product thickness is 0.2mm~2.5mm, the applicable range of the flying shear blade clearance is approximately 0.02mm~0.2mm. Commonly used clearance values ​​are 0.02mm / 0.03mm / 0.05mm / 0.08mm / 0.1mm / 0.12mm / 0.15mm / 0.18mm / 0.2mm / 0.25mm / 0.3mm, a total of 11 clearance values ​​(which can be appropriately increased or decreased according to actual conditions). During the calibration phase of factory testing, the shear blade clearance is adjusted to the above-mentioned applicable values, and the clearance values ​​are checked and confirmed using a feeler gauge. At this time, the position of the absolute encoder 31 corresponding to each clearance value is recorded, and the stroke data table is stored in the control unit for subsequent production.

[0050] Taking an adjustment gap value of 0.1mm as an example, the specific calibration process is as follows: The upper and lower shear blades 11 and 13 of the flying shear are manually driven by a crank-rocker mechanism. Ensuring a gap exists between the blades, the upper and lower blades 11 and 13 are aligned at the same height. A feeler gauge is used to check the gap value. If the value is 0.05mm, the motor is manually or jogged to rotate, which in turn rotates the adjusting screw 23 (in the direction of increasing gap). As the adjusting screw 23 rotates, it drives the pin 28 to move axially along the adjusting screw 23, thereby rotating the connecting rod 20 and driving the eccentric hinge shaft 15 to rotate, ultimately increasing the shear blade gap. When the gap increases to 0.1mm as detected by the feeler gauge, the motor is stopped, and the position of the absolute encoder 31 is recorded. This calibration process is repeated until all gap values ​​are calibrated.

[0051] After completing the above calibration process, during the specific processing operation, a suitable gap value is selected according to the thickness of the steel strip to be produced. Based on the calibration results obtained in the above calibration process, the motor is controlled to rotate through the control unit until the calibration position corresponding to the absolute encoder 31 is reached, so as to quickly complete the adjustment of the shear blade gap value.

[0052] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A crank rocker type flying shear gap automatic adjusting device for adjusting a gap between an upper shear blade (11) and a lower shear blade (13) fixed on an upper tool holder (10) and a lower tool holder (12), respectively, the upper tool holder (10) and the lower tool holder (12) being connected by an eccentric hinge shaft (15), characterized in that, The adjustment device includes: The connecting rod (20) has one end fixed on the eccentric hinge shaft (15), and the other end of the connecting rod (20) is provided with a lead screw and nut pair (24). A fixed base (21) is fixed on the upper tool holder (10) or the lower tool holder (12), and a rotatable positioning shaft (22) is provided on the fixed base (21). An adjusting screw (23) is rotatably connected at one end to the screw nut pair (24) via a thread, and the other end of the adjusting screw (23) is rotatably mounted on the positioning shaft (22). The adjusting screw (23) is provided with a driving member (30) that can drive it to rotate. The eccentric hinge shaft (15) is driven to rotate by the connecting rod (20), which can change the distance between the upper tool holder (10) and the lower tool holder (12) to change the gap between the upper shear blade (11) and the lower shear blade (13). The adjusting screw (23) is provided with an absolute encoder (31), which is electrically connected to a control unit. The control unit is electrically connected to the driving member (30). The control unit can control the drive (30) to rotate according to the pre-calibrated encoding data in the absolute encoder (31) to drive the adjusting screw (23) to rotate and adjust the gap between the upper shear blade (11) and the lower shear blade (13); the axis of the eccentric hinge shaft (15) is parallel to the axis of the positioning shaft (22), and the axis of the adjusting screw (23) is perpendicular to the axis of the positioning shaft (22); the end of the connecting rod (20) connected to the adjusting screw (23) is provided with a pin (28), the screw nut pair (24) is connected to the pin (28), the pin (28) is provided with a through hole coaxial with the screw nut pair (24), and the adjusting screw (23) passes through the through hole.

2. The crank rocker type flying shear blade gap automatic adjustment device according to claim 1, characterized in that, The adjusting screw (23) is provided with a threaded section and a drive section. The threaded section is provided with a thread that cooperates with the screw nut pair (24). The drive section passes through the positioning shaft (22). The drive component (30) and the absolute encoder (31) are both located on the drive section.

3. The crank rocker type flying shear blade gap automatic adjusting device according to claim 1 or 2, characterized in that, A sliding bearing (26) is provided between the adjusting screw (23) and the positioning shaft (22).

4. The crank rocker type flying shear blade gap automatic adjusting device according to claim 1 or 2, characterized in that, A connecting flange (27) is fitted on the adjusting screw (23). One end of the connecting flange (27) is connected to the positioning shaft (22), and the other end of the connecting flange (27) is connected to the housing of the driving component (30).

5. The crank rocker fly shear blade gap automatic adjustment device of claim 1 wherein, The absolute encoder (31) is located at the end of the adjusting screw (23). The housing of the absolute encoder (31) is connected to the housing of the drive (30). The adjusting screw (23) is connected to the grating code disk inside the absolute encoder (31) through the connecting shaft (32).

6. The crank rocker style flying shear blade gap automatic adjustment device of claim 1, wherein, The drive unit (30) is a geared motor, a servo motor, or a hydraulic motor.

7. A method of automatically adjusting the gap between the blades of a crank rocker flying shear, characterized in that, The adjustment method is implemented using the crank-rocker type flying shear blade gap automatic adjustment device as described in any one of claims 1-6, and the adjustment method includes a calibration process and an adjustment process; The calibration process includes: The automatic gap adjustment device adjusts the gap between the flying shear blades to a predetermined value. Record the position of the grating disk corresponding to the absolute encoder (31) when it is at a predetermined gap value; The correspondence between the predetermined gap value and the position of the grating code disk is input and stored in the control unit; Repeat the above process until all predetermined gap values ​​are calibrated to form a gap value-raster code disk position database in the control unit; The adjustment process includes: Input the thickness of the strip to be sheared into the control unit; The control unit retrieves the corresponding predetermined gap value based on the pre-stored strip thickness-gap value database; The control unit retrieves the corresponding grating code disk position based on the gap value-grating code disk position database; The control unit controls the drive (30) to rotate to the calibration position corresponding to the absolute encoder (31) according to the position of the grating code disk, so as to adjust the flying shear blade gap to the predetermined gap value.

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