Crank rocker type flying shear blade gap automatic adjusting device and method

Abstract

The invention relates to the technical field of metal rolling and shearing equipment, and provides a device and a method for automatically adjusting a shear blade gap of a crank rocker type flying shear, which are used for adjusting a gap between an upper shear blade and a lower shear blade which are respectively fixed on an upper knife rest and a lower knife rest, and the upper knife rest and the lower knife rest are connected through an eccentric hinged shaft. The automatic adjusting device for the shear blade gap of the crank rocker type flying shear comprises a connecting rod with one end fixed on the eccentric hinged shaft and the other end provided with a lead screw nut pair; the fixed seat is fixed on the upper knife rest or the lower knife rest, and a rotatable positioning rotating shaft is arranged on the fixed seat; one end of the adjusting lead screw is rotatably connected with the lead screw nut pair through threads, the adjusting lead screw is rotatably arranged on the positioning rotating shaft in a penetrating mode, and a driving piece capable of driving the adjusting lead screw to rotate is arranged on the adjusting lead screw. The flying shear blade gap adjusting device can solve the problems that in the existing flying shear blade gap manual adjusting process, operation difficulty is large, consumed time is long, and adjusting precision is poor.

Description

Technical Field

[0001] The invention relates to the technical field of metal rolling and shearing equipment, and in particular to a crank rocker type flying shear blade clearance automatic adjustment device and method. Background Art

[0002] At present, there are many new production capacities and production lines for high-performance cold-rolled sheet mills (such as galvanizing, continuous annealing, and acid leveling), and the product performance is constantly improving, extending from general building materials to high-value-added end products such as automotive and home appliance plates, zinc-aluminum-magnesium, and silicon steel. In the production of high-performance cold-rolled sheets, the thickness range of steel plates that can be processed is relatively wide, generally 0.2mm to 6mm.

[0003] During the production and operation of the above-mentioned cold-rolled thin plate unit, in order to detect the performance of the strip and remove the plate shape defects of the strip head and tail, it is necessary to use flying shears to perform multiple shearing of the strip while the coil is running, including coil shearing, sampling shearing and waste cutting shearing, etc., and the shearing quality requirements are relatively high. The minimum requirement is that during continuous multi-knife shearing at the shearing process speed, all cutting can be achieved and the fracture surface is smooth and flat.

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

[0005] There are two types of flying shears used in cold-rolled sheet mills. One is a rotary drum flying shear. When multiple cuts are required, multiple shear blades must be installed on the same cutter shaft. This requires high processing precision, high manufacturing difficulty, and inconvenient use and maintenance. When multiple cuts are required to be cut continuously, a crank rocker flying shear is more suitable. The crank rocker flying shear is generally suitable for units with medium and low process shearing speeds and extremely high requirements for production process stability, such as galvanizing, continuous annealing, and acid leveling units.

[0006] The existing crank rocker flying shears have a manual adjustment device for the shear blade gap. A set of shear blade gap adjustment mechanisms are provided at both ends of the tool holder. Both sides need to be manually adjusted at the same time. After adjustment, they need to be checked and confirmed with a feeler gauge. If the detection does not meet the requirements, it needs to be readjusted, which is time-consuming. If the gaps on both sides are not adjusted consistently, it will also affect the uniformity of the shear blade gap, resulting in uncut strip steel or interference and collision accidents. In addition, for the above-mentioned manual gap adjustment mechanism, since the gap value cannot be calibrated after adjustment, a complete set of adjustment operations that require manual adjustment and confirmation are required every time the thickness of the strip steel changes. In addition to the above-mentioned defects, due to the limited space of the unit equipment and the limited operating space, it is difficult for operators to make manual adjustments, which often leads to poor gap adjustment accuracy. Summary of the invention

[0007] The purpose of the present invention is to provide a crank rocker type flying shear blade clearance automatic adjustment device and method to solve the problems of difficult operation, long time consumption and poor adjustment accuracy in the current manual adjustment process of the flying shear blade clearance.

[0008] The above technical objectives of the present invention are mainly achieved through the following technical solutions:

[0009] On the one hand, the present invention provides a crank rocker type flying shear blade gap automatic adjustment device, which is used to adjust the gap between an upper shear blade and a lower shear blade respectively fixed on an upper tool holder and a lower tool holder, wherein the upper tool holder and the lower tool holder are connected via an eccentric hinge shaft, and the crank rocker type flying shear blade gap automatic adjustment device comprises:

[0010] A connecting rod, one end of which is fixed to the eccentric hinge shaft, and the other end of the connecting rod is provided with a lead screw nut pair;

[0011] A fixed seat, fixed on the upper tool holder or the lower tool holder, and a rotatable positioning shaft is provided on the fixed seat;

[0012] An adjusting screw has one end rotatably connected to the screw nut pair through a thread, and the other end of the adjusting screw is rotatably passed through the positioning shaft. The adjusting screw is provided with a driving member capable of driving the adjusting screw to rotate.

[0013] The crank rocker type flying shear blade clearance automatic adjustment device of the present invention adopts a ball screw structure to realize the control of the rotation of the eccentric hinge shaft, the clearance between the adjustment screw and the screw nut pair is small, and the adjustment accuracy is high.

[0014] The crank rocker type flying shear blade gap automatic adjustment device described in the present invention is provided with a driving member on the adjustment screw to drive the adjustment screw to rotate, adopts an electric drive or hydraulic drive mode, has a fast adjustment speed, and can realize automatic adjustment of the gap through an external control unit to avoid manual operation.

[0015] In a preferred embodiment of the present invention, the adjusting screw is provided with an absolute value encoder, the absolute value encoder is electrically connected to a control unit, and the control unit is electrically connected to the driving member;

[0016] Wherein, the control unit can control the rotation of the driving member according to the pre-calibrated encoding data in the absolute value encoder, so as to drive the adjusting screw to rotate and adjust the gap between the upper shearing blade and the lower shearing blade.

[0017] 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 required gap value is to be selected, the control unit only needs to control the driving member to rotate. When it rotates to the position corresponding to the gap memorized by the absolute encoder, the driving member is controlled to stop rotating. This avoids human operating errors during manual adjustment, and improves the adjustment speed and accuracy.

[0018] In a preferred embodiment of the present invention, the axis of the eccentric hinge shaft is parallel to the axis of the positioning shaft, and the axis of the adjusting screw is perpendicular to the axis of the positioning shaft.

[0019] 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 matching the screw nut pair, the driving section passes through the positioning shaft, and the driving member and the absolute encoder are both arranged in the driving section.

[0020] In a preferred embodiment of the present invention, a sliding bearing is provided between the adjusting screw and the positioning shaft.

[0021] 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 member.

[0022] In a preferred embodiment of the present invention, the absolute value encoder is arranged at the end of the adjusting screw, the housing of the absolute value encoder is connected to the housing of the driving member, and the adjusting screw is connected to the grating code disk in the absolute value encoder through a connecting shaft.

[0023] In a preferred embodiment of the present invention, a pin is provided at one end of the connecting rod connected to the adjusting screw, the screw nut pair is connected to the pin, a through hole coaxial with the screw nut pair is provided on the pin, and the adjusting screw is inserted in the through hole.

[0024] In a preferred embodiment of the present invention, the driving member is a reduction motor, a servo motor or a hydraulic motor.

[0025] On the other hand, the present invention also provides a crank rocker flying shear blade clearance automatic adjustment method, the adjustment method is implemented by the crank rocker flying shear blade clearance automatic adjustment device as described above, the crank rocker flying shear blade clearance automatic adjustment method includes a calibration process and an adjustment process;

[0026] The calibration process includes the following steps:

[0027] Step S1: adjusting the shear blade gap of the flying shear to a predetermined gap value by means of an automatic gap adjustment device;

[0028] Step S2: recording the position of the grating code disk corresponding to the absolute encoder (31) when the gap value is at a predetermined value;

[0029] Step S3: inputting and storing the corresponding relationship between the predetermined gap value and the position of the grating code disk into the control unit;

[0030] Step S4: repeat the above process until all the predetermined gap values ​​are calibrated to form a gap value-grating code disk position database in the control unit;

[0031] The adjustment process includes the following steps:

[0032] Step S5: inputting the thickness of the strip to be sheared into the control unit;

[0033] Step S6: the control unit retrieves the corresponding predetermined gap value according to the pre-stored strip thickness-gap value database;

[0034] Step S7: the control unit retrieves the corresponding grating code disk position according to the gap value-grating code disk position database;

[0035] Step S8: The control unit controls the driving member (30) to rotate to a calibrated position corresponding to the absolute value encoder (31) according to the position of the grating code disk, so as to adjust the shearing blade gap of the flying shear to a predetermined gap value.

[0036] The method for automatically adjusting the gap of the shearing blades of a crank rocker type flying shear described in the present invention is implemented by adopting the above-mentioned automatic adjustment device for the gap of the shearing blades of a crank rocker type flying shear, and adopts a combined structure of a ball screw structure and an absolute encoder. The gap of the shearing blades of the flying shear is first calibrated, and then in the actual gap adjustment process, it is quickly adjusted to the required gap value according to the calibration data. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0038] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0039] Figure 1 It is a schematic structural diagram of the crank rocker type flying shear blade clearance automatic adjustment device of the present invention;

[0040] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction.

[0041] Description of reference numerals:

[0042] 10. Upper tool holder; 11. Upper shear blade; 12. Lower tool holder; 13. Lower shear blade; 14. Box; 15. Eccentric hinge shaft;

[0043] 20. Connecting rod; 21. Fixed seat; 22. Positioning shaft; 23. Adjusting screw; 24. Screw nut pair; 25. Bushing; 26. Sliding bearing; 27. Connecting flange; 28. Pin; 29. ​​Key;

[0044] 30. Driving member; 31. Absolute encoder; 32. Connecting shaft. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0046] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0048] Implementation method 1:

[0049] like Figure 1 and Figure 2 As shown, the present invention provides a crank rocker type flying shear blade gap automatic adjustment device, which is used for adjusting the gap between the upper shear blade 11 and the lower shear blade 13 respectively fixed on the upper tool holder 10 and the lower tool holder 12, the upper tool holder 10 and the lower tool holder 12 are connected by an eccentric hinge shaft 15, and the crank rocker type flying shear blade gap automatic adjustment device comprises: 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 tool holder 10 or the lower tool holder 12, and the fixed seat 21 is provided with a rotatable positioning shaft 22; an adjusting screw 23, one end of which is rotatably connected to the screw nut pair 24 through a thread, the other end of the adjusting screw 23 is rotatably penetrated on the positioning shaft 22, and the adjusting screw 23 is provided with a driving member 30 that can drive it to rotate.

[0050] The crank rocker type flying shear blade clearance automatic adjustment device of the present invention adopts a ball screw structure to realize the control of the rotation of the eccentric hinge shaft 15, and the clearance between the adjustment screw 23 and the screw nut pair 24 is small, and the adjustment accuracy is high.

[0051] The crank rocker type flying shears blade gap automatic adjustment device described in the present invention is provided with a driving member 30 on the adjusting screw 23 for driving the screw 23 to rotate. It adopts electric drive or hydraulic drive, has a fast adjustment speed, and can realize automatic adjustment of the gap through an external control unit to avoid manual operation.

[0052] The specific structure of each part of the crank rocker type flying shears blade gap automatic adjustment device of the present invention, as well as the position and connection relationship between the various parts of the structure will be described in detail below.

[0053] First, the structure of the crank rocker shear blade is briefly described. Figure 1 As shown, it includes an upper shear blade 11 and a lower shear blade 13 which are opposite to each other, wherein the upper shear blade 11 is mounted on an upper tool holder 10, and the lower shear blade 13 is mounted on a lower tool holder 12; the upper tool holder 10 and the lower tool holder 12 are connected via an eccentric hinge shaft 15, and by rotating the eccentric hinge shaft 15, the distance between the upper tool holder 10 and the lower tool holder 12 can be changed, thereby changing the gap between the upper shear blade 11 and the lower shear blade 13.

[0054] The crank rocker type flying shear blade clearance automatic adjustment device described in the present invention includes a connecting rod 20 installed on the above-mentioned eccentric hinge shaft 15, and 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.

[0055] like Figure 1 and Figure 2 As shown, the other end of the connecting rod 20 is connected to an adjustment screw 23 that can drive it to rotate. The end of the connecting rod 20 connected to the adjustment screw 23 is provided with a pin 28, which is assembled in the connecting rod 20 and leaves an appropriate gap to ensure that the pin 28 can rotate relative to the connecting rod 20. The pin 28 is connected to the screw nut pair 24 by bolts, and the pin 28 is provided with a through hole coaxially arranged with the screw nut pair 24, and the adjustment screw 23 is simultaneously penetrated in the through hole and the screw nut pair 24. Among them, the thread provided on the adjustment screw 23 can be threadedly connected with the screw nut pair 24; there is a gap between the adjustment screw 23 and the through hole on the pin 28 to ensure that the adjustment screw 23 can move and rotate relative to the pin 28.

[0056] Further, 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 a thread that matches the screw nut pair 24, and the driving section ( Figure 2 The right half of the adjusting screw 23 is rotatably connected to the upper tool holder 10 or the lower tool holder 12; in this embodiment, Figure 1 As shown, one end of the adjusting screw 23 away from the connecting rod 20 is connected to the lower tool holder 12 through a fixing seat 21 and a positioning shaft 22 .

[0057] Specifically, Figure 2 As shown, the fixed seat 21 is installed on the lower tool holder 12, and a positioning shaft 22 that can rotate relative to the fixed seat 21 is connected to the fixed seat 21. A through hole is opened on the positioning shaft 22, and the driving section of the adjusting screw 23 is inserted in the through hole; a sleeve 25 and a connecting flange 27 are respectively provided on both sides of the through hole, and the sleeve 25 and the connecting flange 27 are respectively sleeved on the adjusting screw 23. Among them, one end of the sleeve 25 abuts on the positioning shoulder on the adjusting screw 23, and the other end abuts on the positioning shaft 22; one end of the connecting flange 27 is fixed to the positioning shaft 22 by bolts. There is a gap between the adjusting screw 23 and the sleeve 25, the through hole on the positioning shaft 22, and the connecting flange 27, and they can rotate relatively.

[0058] Further, such as Figure 2As shown, in order to drive the adjusting screw 23 to rotate, a driving member 30 is provided on the other side of the connecting flange 27, and the driving member 30 is sleeved on the adjusting screw 23. The driving section of the adjusting screw 23 penetrates into the hollow shaft of the driving member 30, and a key 29 is provided to transmit torque, so that the driving member 30 drives the adjusting screw 23. The housing of the driving member 30 is connected to the connecting flange 27 to fix the driving member 30.

[0059] Preferably, the driving member 30 may be a reduction motor, a servo motor or a hydraulic motor.

[0060] Further, 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 disposed in a through hole on the positioning shaft 22 , and the sliding bearing 26 enables the adjusting screw 23 to rotate relatively to the positioning shaft 22 more smoothly.

[0061] The structure and technical effects of the preferred embodiment of the crank rocker type flying shears blade clearance automatic adjustment device of the present invention will be further described below.

[0062] According to one embodiment of the present invention, Figure 1 and Figure 2 As shown, an absolute value encoder 31 is provided on the adjustment screw 23, and the absolute value encoder 31 is electrically connected to a control unit (not shown in the figure), and the control unit is electrically connected to the driving member 30; wherein, the control unit can control the driving member 30 to rotate according to the pre-calibrated coding data in the absolute value encoder 31, so as to drive the adjustment screw 23 to rotate and adjust the gap between the upper shear blade 11 and the lower shear blade 13.

[0063] A high-precision absolute encoder 31 is used to detect and calibrate the position of different gap values ​​of the shear blade. When the required gap value is to be selected, the control unit only needs to control the driving member 30 to rotate. When it rotates to the position corresponding to the gap memorized by the absolute encoder 31, the driving member 30 is controlled to stop rotating. This avoids human operating errors during manual adjustment, and improves the adjustment speed and adjustment accuracy.

[0064] Specifically, Figure 2 As shown, the absolute encoder 31 is arranged at the end of the adjusting screw 23, the housing of the absolute encoder 31 is connected to the housing of the driving member 30, and the adjusting screw 23 is connected to the grating code disk in the absolute encoder 31 through the connecting shaft 32. The control unit can be a PLC controller to control the absolute encoder 31.

[0065] According to one embodiment of the present invention, 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 .

[0066] Implementation method 2:

[0067] The present invention also provides a crank rocker type flying shear blade clearance automatic adjustment method, the adjustment method is implemented by using the crank rocker type flying shear blade clearance automatic adjustment device as described in the first embodiment, the crank rocker type flying shear blade clearance automatic adjustment method includes a calibration process and an adjustment process;

[0068] The calibration process includes the following steps:

[0069] Step S1: adjusting the shear blade gap of the flying shear to a predetermined gap value by means of an automatic gap adjustment device;

[0070] Step S2: recording the position of the grating code disk corresponding to the absolute encoder 31 when the gap value is at a predetermined value;

[0071] Step S3: inputting and storing the corresponding relationship between the predetermined gap value and the position of the grating code disk into the control unit;

[0072] Step S4: repeat the above process until all the predetermined gap values ​​are calibrated to form a gap value-grating code disk position database in the control unit;

[0073] The adjustment process includes the following steps:

[0074] Step S5: inputting the thickness of the strip to be sheared into the control unit;

[0075] Step S6: the control unit retrieves the corresponding predetermined gap value according to the pre-stored strip thickness-gap value database;

[0076] Step S7: the control unit retrieves the corresponding grating code disk position according to the gap value-grating code disk position database;

[0077] Step S8: The control unit controls the driving member 30 to rotate to a calibrated position corresponding to the absolute encoder 31 according to the position of the grating code disk, so as to adjust the shearing blade gap of the flying shear to a predetermined gap value.

[0078] Among them, 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. When strips of different thicknesses are sheared, different gap values ​​are required. Technical personnel in this field 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.

[0079] The crank rocker flying shear blade automatic adjustment method of the present invention is implemented by the above-mentioned crank rocker flying shear blade automatic adjustment device, and adopts a combined structure of a ball screw structure and an absolute encoder 31 to first calibrate the gap of the flying shear blade, and then quickly adjust it to the required gap value according to the calibration data during the actual gap adjustment process.

[0080] Specifically, in a certain galvanizing unit, the product thickness is 0.2mm~2.5mm, and the use range of the flying shear blade clearance is about 0.02mm~0.2mm. The 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, with a total of 11 clearance values ​​(which can also be appropriately increased or decreased according to actual conditions). During the calibration stage of factory debugging, the shear blade clearances are adjusted to the above-mentioned usage values, and the above-mentioned clearance values ​​are detected and determined with a feeler gauge. At this time, the position of the absolute encoder 31 corresponding to each clearance value is recorded, and the travel data table is stored in the control unit for subsequent production.

[0081] Taking the adjustment of the gap value to 0.1mm as an example, the specific calibration process is as follows:

[0082] Manually drive the upper cutting blade 11 and the lower cutting blade 13 of the crank rocker flying shear to move, and then ensure that there is a gap between the cutting blades, so that the upper cutting blade 11 and the lower cutting blade 13 overlap in height. At this time, use a feeler gauge to detect the gap value. If the detected value is 0.05mm, manually or inching the motor to rotate, and then drive the adjustment screw 23 (in the direction of increasing the gap) to rotate. When the adjustment screw 23 rotates, it drives the pin 28 to move axially along the adjustment screw 23, thereby driving the connecting rod 20 to rotate, driving the eccentric hinge shaft 15 to rotate, and finally realizing the increase of the cutting blade gap. When the feeler gauge detects that the gap increases to 0.1mm, stop rotating the motor and record the position of the absolute encoder 31 at this time. Repeat the above calibration process until all gap values ​​are calibrated.

[0083] After completing the above calibration process, in the specific processing operation, the appropriate gap value is selected according to the thickness of the steel strip to be produced. According to the calibration result obtained in the above calibration process, the control unit controls the motor to rotate until the calibration position corresponding to the absolute encoder 31 is reached, so as to quickly complete the adjustment of the shear gap value.

[0084] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is 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 in the scope of protection of the present invention.

Claims

1. A crank rocker type flying shear blade gap automatic adjustment device, used for adjusting the gap between an upper shear blade (11) and a lower shear blade (13) respectively fixed on an upper tool holder (10) and a lower tool holder (12), wherein the upper tool holder (10) and the lower tool holder (12) are connected via an eccentric hinge shaft (15), characterized in that: The adjusting device comprises: 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) fixed on the upper tool holder (10) or the lower tool holder (12), wherein a rotatable positioning shaft (22) is provided on the fixed seat (21); One end of the adjusting screw (23) is rotatably connected to the screw nut pair (24) via a thread, and the other end of the adjusting screw (23) is rotatably inserted into the positioning shaft (22). The adjusting screw (23) is provided with a driving member (30) capable of driving the adjusting screw to rotate.

2. The crank rocker type flying shear blade clearance automatic adjustment device according to claim 1 is characterized in that: An absolute value encoder (31) is provided on the adjusting screw (23), the absolute value encoder (31) is electrically connected to a control unit, and the control unit is electrically connected to the driving member (30); The control unit can control the driving member (30) to rotate according to the pre-calibrated encoding data in the absolute value encoder (31), so as to drive the adjusting screw (23) to rotate and adjust the gap between the upper shearing blade (11) and the lower shearing blade (13).

3. The crank rocker type flying shear blade clearance automatic adjustment device according to claim 1 or 2, characterized in that: 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).

4. The crank rocker type flying shear blade clearance automatic adjustment device according to claim 2 is characterized in that: The adjusting screw (23) is provided with a threaded section and a driving section, the threaded section is provided with a thread matching the screw nut pair (24), the driving section passes through the positioning shaft (22), and the driving member (30) and the absolute value encoder (31) are both arranged on the driving section.

5. The crank rocker type flying shear blade clearance automatic adjustment device according to claim 1 or 4, characterized in that: A sliding bearing (26) is provided between the adjusting screw (23) and the positioning shaft (22).

6. The crank rocker type flying shears blade clearance automatic adjustment device according to claim 1 or 4, characterized in that: The adjusting screw (23) is sleeved with a connecting flange (27), 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 member (30).

7. The crank rocker type flying shear blade clearance automatic adjustment device according to claim 2 is characterized in that: The absolute value encoder (31) is arranged at the end of the adjusting screw (23), the housing of the absolute value encoder (31) is connected to the housing of the driving member (30), and the adjusting screw (23) is connected to the grating code disk in the absolute value encoder (31) through a connecting shaft (32).

8. The crank rocker type flying shear blade clearance automatic adjustment device according to claim 1, characterized in that: A pin shaft (28) is provided at one end of the connecting rod (20) connected to the adjusting screw (23); the screw nut pair (24) is connected to the pin shaft (28); a through hole coaxial with the screw nut pair (24) is provided on the pin shaft (28); the adjusting screw (23) is inserted into the through hole.

9. The crank rocker type flying shear blade clearance automatic adjustment device according to claim 1, characterized in that: The driving member (30) is a reduction motor, a servo motor or a hydraulic motor.

10. A method for automatically adjusting the shearing blade clearance of a crank rocker flying shear, characterized in that: The adjustment method is implemented by using the crank rocker type flying shear blade clearance automatic adjustment device as described in any one of claims 2 to 9, and the adjustment method includes a calibration process and an adjustment process; The calibration process includes: The flying shear blade clearance is adjusted to a predetermined clearance value by an automatic clearance adjustment device; Recording the position of the grating code disk corresponding to the absolute value encoder (31) when the gap is at a predetermined value; Inputting and storing the corresponding relationship between the predetermined gap value and the position of the grating code disk into the control unit; Repeat the above process until all the predetermined gap values ​​are calibrated to form a gap value-grating code disk position database in the control unit; The adjustment process includes: Input the thickness of the strip to be cut into the control unit; The control unit retrieves the corresponding predetermined gap value according to the pre-stored strip thickness-gap value database; The control unit retrieves the corresponding grating code disk position according to the gap value-grating code disk position database; The control unit controls the driving member (30) to rotate to a calibrated position corresponding to the absolute value encoder (31) according to the position of the grating code disk, so as to adjust the shearing blade gap of the flying shear to a predetermined gap value.

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