Device for automatically adjusting blade overlapping of circle shear

Abstract

The invention discloses a device for automatically adjusting blade overlapping of a circle shear, and relates to the technical field of circle shears, the device comprises a supporting seat, a first disc and a second disc, a device main body is mounted above the supporting seat, a transmission shaft is mounted on the left side of the device main body through a bearing seat, and the second disc is arranged on the left side of the first disc; a first bearing and a second bearing are arranged on the upper side and the lower side in the arc-shaped groove correspondingly, and a first connecting column is installed between the first bearing on the first disc and the first bearing on the second disc. The device for automatically adjusting blade overlapping of the circle shear is provided with the first disc and the second disc, the fine adjustment motor drives the first disc and the second disc to rotate, then the first movable strip, the second movable strip and the blade device are driven to move, accurate adjustment of the overlapping amount of the blade device is achieved, and compared with traditional manual adjustment, the efficiency is improved. The adjusting efficiency is greatly improved, production stagnation caused by too long adjusting time is reduced, and the smoothness of the production process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of circular shears, and particularly to a device for automatically adjusting the blade overlap of a circular shear. Background Art

[0002] In modern industrial production, as an important sheet metal processing equipment, circular shears are widely used in many fields such as metal processing, packaging material production, and automobile manufacturing. Its working principle is to shear the sheet metal by the relative rotation of two circular blades, the upper and the lower, to obtain sheet metal products with the required dimensions and shapes. During the operation of the circular shear, the precise control of the blade overlap is a key factor affecting the shearing quality and the operation stability of the equipment.

[0003] When adjusting the blade overlap of traditional circular shears, it mainly relies on manual operation. The operator needs to rely on experience and manually adjust mechanical components such as screws and nuts to change the relative position between the blades, so as to adjust the blade overlap.

[0004] For example, the Chinese utility model patent with the application number 202022839800.6 discloses a cold rolling circular shear device, which extends the shearing distance of the circular shear, reduces the occurrence of tool breakage, can improve the production efficiency of the cold rolling mill, and reduces the investment cost of the circular shear blades. However, there are still certain defects in its device;

[0005] It is not convenient to adjust the overlap of the cutting tools, which thus hinders the smoothness of the production process and the stability of the product quality. When switching to process workpieces with different materials and thicknesses, the operator often needs to spend a lot of time adjusting the tool overlap.

[0006] Therefore, we propose a device for automatically adjusting the blade overlap of a circular shear to solve the problems raised above. Summary of the Invention

[0007] The purpose of the present invention is to provide a device for automatically adjusting the blade overlap of a circular shear to solve the problem in the above background art that it is not convenient to adjust the overlap of the cutting tools in the current market, which thus hinders the smoothness of the production process and the stability of the product quality. When switching to process workpieces with different materials and thicknesses, the operator often needs to spend a lot of time adjusting the tool overlap.

[0008] To achieve the above object, the present invention provides the following technical solution: A device for automatically adjusting the blade overlap of a circular shear, comprising a support base, a first circular disk and a second circular disk. Above the support base, a device main body is installed. On the left side of the device main body, a transmission shaft is installed through a bearing seat, and on the left side of the transmission shaft, a first circular disk is installed. On the left side of the first circular disk, a second circular disk is provided. On the opposite sides of the first circular disk and the second circular disk, arc-shaped grooves are respectively provided. On the upper and lower sides inside the arc-shaped grooves, a first bearing and a second bearing are respectively provided. Between the first bearings on the first circular disk and the second circular disk, a first connecting column is installed, and between the second bearings on the first circular disk and the second circular disk, a second connecting column is installed. On the opposite sides of the upper and lower second connecting columns, a first connecting frame and a second connecting frame are installed through a connecting block. Inside the first connecting frame and the second connecting frame, a first movable bar and a second movable bar are respectively installed;

[0009] Inside the first movable bar and the second movable bar, a movable shaft penetrates through. On the right sides of the movable shafts, connecting disks are installed. On the upper and lower sides on the right side of the connecting disk, fixed seats are installed, and on the fixed seats, rotating motors are installed. On the right side of the rotating motor, a blade device is installed through an output shaft;

[0010] On the left and right sides inside the first movable bar and the second movable bar, limit rings are installed, and annular grooves are respectively provided inside the limit rings. On the left and right sides of the movable shaft, movable rings are installed. On the upper and lower sides of the left movable ring, threaded grooves are provided. On the upper sides of the first movable bar and the second movable bar, positioning bolts are installed.

[0011] Preferably, on the left side of the device main body, a connecting frame is installed, and on the left side of the connecting frame, a fine-tuning motor is installed. On the right side of the fine-tuning motor, a connecting shaft is installed through an output shaft.

[0012] With the above structural design, when the fine-tuning motor is started, the output shaft of the fine-tuning motor drives the connecting shaft to rotate.

[0013] Preferably, the connecting shaft is connected to the second circular disk and the first circular disk, and both the first bearing and the second bearing are abutted against the inner wall of the arc-shaped groove.

[0014] With the above structural design, when the connecting shaft rotates, it drives the second disc and the first disc to rotate synchronously. The second disc and the first disc drive the arc-shaped grooves above them, and the arc-shaped grooves drive the first bearing and the second bearing inside them to move relatively or in opposite directions. The first bearing and the second bearing drive the first connecting column and the second connecting column to move relatively or in opposite directions, thereby driving the first connecting frame and the second connecting frame connected to the first connecting column and the second connecting column to move relatively or in opposite directions. The first connecting frame and the second connecting frame drive the first movable strip and the second movable strip to move relatively or in opposite directions, so as to facilitate the adjustment of the distance between the blade devices arranged on the right sides of the first movable strip and the second movable strip, and thus realize the adjustment of the blade overlap amount.

[0015] Preferably, the first movable strip and the second movable strip are respectively fixedly connected to the first connecting frame and the second connecting frame. Limiting grooves are provided on both the upper and lower sides inside the device body, and the first movable strip and the second movable strip are both slidably connected to the limiting grooves.

[0016] With the above structural design, when the first movable strip and the second movable strip are stressed, they slide in the limiting grooves, so that the first movable strip and the second movable strip are more stable when moving left and right and will not shift.

[0017] Preferably, electromagnets are installed on the inner walls of the limiting grooves. The electromagnets are in contact with and adsorbed to the first movable strip and the second movable strip.

[0018] With the above structural design, after the adjustment of the blade overlap amount is completed, the electromagnets are energized, and the electromagnets adsorb and fix the first movable strip and the second movable strip, thereby improving the installation stability of the first movable strip and the second movable strip, and making the blade devices on the right sides of the first movable strip and the second movable strip more stable during shearing.

[0019] Preferably, the fixed seat is detachably connected to the connecting disc. The blade devices on the upper and lower connecting discs are not on the same vertical plane, and there is an overlapping surface when the blade devices on the upper and lower connecting discs are distributed close to each other.

[0020] With the above structural design, start two rotating motors that are close to each other. The rotating motors drive the blade devices on them to rotate, and the sheet material is sheared by the upper and lower blade devices.

[0021] Preferably, through grooves are provided in both the first movable strip and the second movable strip. The center line of the through groove coincides with the center line of the movable shaft, and the limiting ring is fixed inside the through groove.

[0022] With the above structural design, by rotating the movable shaft, the movable shaft drives the connecting disc to rotate, and the connecting disc drives the fixed seat, the rotating motor and the blade device on the right side to rotate, so that the blade devices on the upper and lower sides on the right side of the connecting disc are transposed, thereby facilitating the rapid replacement of the blade device.

[0023] Preferably, the movable ring is clamped in the annular groove on the limiting ring, and the movable ring is rotatably connected to the annular groove.

[0024] With the above structural design, when the movable shaft is rotated, the movable ring on the movable shaft rotates along the annular groove on the limiting ring, so that the movable shaft is more stable when rotating.

[0025] Preferably, the center line of the threaded groove coincides with the center line of the positioning bolt, and the positioning bolt is threadedly connected to the threaded groove.

[0026] With the above structural design, the movable shaft is rotated, the movable shaft drives the movable ring to rotate, the movable ring is rotated to make the threaded groove above it correspond to the positioning bolt, and then the positioning bolt is rotated, and the positioning bolt moves downward to be connected to the threaded groove on the movable ring, thereby completing the positioning of the movable shaft, and thus realizing the positioning of the blade device on the right side of the movable shaft after transposition. The structure is simple and the operation is convenient.

[0027] Preferably, the positioning bolt is threadedly connected to the first movable strip and the second movable strip. Indication lines are arranged on the left sides of the first movable strip and the second movable strip, and a marking line is arranged on the left side of the movable shaft.

[0028] With the above structural design, it is convenient to control the rotation amount of the movable shaft when the movable shaft is rotated, so that the threaded groove on the movable ring corresponds to the positioning bolt.

[0029] Compared with the prior art, the beneficial effects of the present invention are: the device for automatically adjusting the blade overlap of the disc shear:

[0030] 1. A first disc and a second disc are provided. The first disc and the second disc are driven to rotate by a fine-tuning motor, and then the first movable strip, the second movable strip and the blade device are driven to move, realizing precise adjustment of the overlap amount of the blade device. Compared with traditional manual adjustment, the adjustment efficiency is greatly improved, the production stagnation caused by too long adjustment time is reduced, and the smoothness of the production process is improved;

[0031] 2. A movable shaft is provided. By rotating the movable shaft, the movable shaft drives the connecting disc to rotate, and the connecting disc drives the fixed seat, the rotating motor and the blade device on the right side to rotate, so that the blade devices on the upper and lower sides on the right side of the connecting disc are transposed, thereby facilitating the rapid replacement of the blade device;

[0032] 3. An electromagnet is provided. After the adjustment of the blade overlapping amount is completed, the electromagnet is energized, and the electromagnet adsorbs and fixes the first movable bar and the second movable bar, thereby improving the installation stability of the first movable bar and the second movable bar, and making the blade device on the right side of the first movable bar and the second movable bar more stable during shearing;

[0033] 4. A fixed seat is provided, and the fixed seat is detachably connected to the connecting disc, which is convenient for replacing, repairing and maintaining the blade device. When the blade is worn or damaged, it can be quickly processed, reducing the equipment downtime and improving the utilization rate of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic partial cross-sectional structure diagram of the present invention;

[0035] Figure 2 of the present invention Figure 1 is an enlarged structure diagram at A in;

[0036] Figure 3 of the present invention Figure 1 is an enlarged structure diagram at B in;

[0037] Figure 4 is a schematic front view structure diagram of the present invention;

[0038] Figure 5 is a schematic position structure diagram of the first disc and the second disc of the present invention;

[0039] Figure 6 is an exploded view of the first disc and the second disc of the present invention;

[0040] Figure 7 is a schematic position structure diagram of the first movable bar and the connecting disc of the present invention;

[0041] Figure 8 is a schematic internal structure diagram of the first movable bar of the present invention;

[0042] Figure 9 is a schematic cross-sectional structure diagram of the limiting ring and the movable ring of the present invention;

[0043] Figure 10 of the present invention Figure 9 is an enlarged structure diagram at C in.

[0044] In the figure: 1, support base; 2, device main body; 3, bearing seat; 4, transmission shaft; 5, first disc; 6, connecting frame; 7, fine-tuning motor; 8, connecting shaft; 9, second disc; 10, arc-shaped groove; 11, first bearing; 12, second bearing; 13, first connecting column; 14, second connecting column; 15, connecting block; 16, first connecting frame; 17, second connecting frame; 18, first movable strip; 19, second movable strip; 20, limiting groove; 21, electromagnet; 22, movable shaft; 23, connecting disc; 24, fixed seat; 25, rotating motor; 26, blade device; 27, limiting ring; 28, annular groove; 29, movable ring; 30, threaded groove; 31, positioning bolt. Detailed implementation manner

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0046] Please refer to Figures 1 - 10, the present invention provides a technical solution: a device for automatically adjusting the blade overlap of a circular shear, including a support base 1, a device main body 2, a bearing seat 3, a transmission shaft 4, a first disc 5, a connecting frame 6, a fine-tuning motor 7, a connecting shaft 8, a second disc 9, an arc-shaped groove 10, a first bearing 11, a second bearing 12, a first connecting column 13, a second connecting column 14, a connecting block 15, a first connecting frame 16, a second connecting frame 17, a first movable bar 18, a second movable bar 19, a limiting groove 20, an electromagnet 21, a movable shaft 22, a connecting disc 23, a fixed seat 24, a rotating motor 25, a blade device 26, a limiting ring 27, an annular groove 28, a movable ring 29, a threaded groove 30, and a positioning bolt 31. The device main body 2 is installed above the support base 1. The connecting frame 6 is installed on the left side of the device main body 2, and the fine-tuning motor 7 is installed on the left side of the connecting frame 6. The right side of the fine-tuning motor 7 is installed with a connecting shaft 8 through an output shaft. When the fine-tuning motor 7 is started, the output shaft of the fine-tuning motor 7 drives the connecting shaft 8 to rotate. The transmission shaft 4 is installed on the left side of the device main body 2 through the bearing seat 3, and the first disc 5 is installed on the left side of the transmission shaft 4. The second disc 9 is arranged on the left side of the first disc 5, and arc-shaped grooves 10 are respectively opened on the opposite sides of the first disc 5 and the second disc 9. The first bearing 11 and the second bearing 12 are respectively arranged on the upper and lower sides inside the arc-shaped groove 10. The first connecting column 13 is installed between the first bearings 11 on the first disc 5 and the second disc 9, and the second connecting column 14 is installed between the second bearings 12 on the first disc 5 and the second disc 9. On the opposite sides of the upper and lower second connecting columns 14, the first connecting frame 16 and the second connecting frame 17 are installed through the connecting block 15. The connecting shaft 8 is connected to the second disc 9 and the first disc 5. Both the first bearing 11 and the second bearing 12 are in contact with the inner wall of the arc-shaped groove 10. When the connecting shaft 8 rotates, it drives the second disc 9 and the first disc 5 to rotate synchronously. The second disc 9 and the first disc 5 drive the arc-shaped grooves 10 above them, and the arc-shaped grooves 10 drive the first bearing 11 and the second bearing 12 inside them to move relatively or in the opposite direction. The first bearing 11 and the second bearing 12 drive the first connecting column 13 and the second connecting column 14 to move relatively or in the opposite direction, thereby driving the first connecting frame 16 and the second connecting frame 17 connected to the first connecting column 13 and the second connecting column 14 to move relatively or in the opposite direction. The first connecting frame 16 and the second connecting frame 17 drive the first movable bar 18 and the second movable bar 19 to move relatively or in the opposite direction, so as to facilitate adjusting the distance between the blade device 26 arranged on the right sides of the first movable bar 18 and the second movable bar 19, thereby realizing the adjustment of the blade overlap amount. The first movable bar 18 and the second movable bar 19 are respectively installed inside the first connecting frame 16 and the second connecting frame 17, and the first movable bar 18 and the second movable bar 19 are respectively fixedly connected to the first connecting frame 16 and the second connecting frame 17. Limiting grooves 20 are respectively opened on the upper and lower sides inside the device main body 2, and the first movable bar 18 and the second movable bar 19 are both slidably connected to the limiting grooves 20.When the first movable bar 18 and the second movable bar 19 are stressed, they slide within the limit groove 20, making the left and right movement of the first movable bar 18 and the second movable bar 19 more stable without deviation. Electromagnets 21 are installed on the inner walls of the limit groove 20. The electromagnets 21 are in contact with and adsorb the first movable bar 18 and the second movable bar 19. After the adjustment of the blade overlap amount is completed, the electromagnets 21 are energized, and the electromagnets 21 adsorb and fix the first movable bar 18 and the second movable bar 19, thereby improving the installation stability of the first movable bar 18 and the second movable bar 19 and making the blade device 26 on the right side of the first movable bar 18 and the second movable bar 19 more stable during shearing.,

[0047] A movable shaft 22 penetrates through the interiors of the first movable bar 18 and the second movable bar 19, and connecting discs 23 are installed on the right sides of the movable shaft 22. Fixed seats 24 are installed on the upper and lower sides on the right side of the connecting disc 23. The fixed seats 24 are detachably connected to the connecting disc 23. The blade devices 26 on the upper and lower connecting discs 23 are not on the same vertical plane, and there is an overlapping surface when the blade devices 26 on the upper and lower connecting discs 23 are distributed close to each other. Two rotating motors 25 close to each other are started, and the rotating motors 25 drive the blade devices 26 thereon to rotate, and the sheet material is sheared by the upper and lower blade devices 26. A rotating motor 25 is installed on the fixed seat 24, and a blade device 26 is installed on the right side of the rotating motor 25 through an output shaft.

[0048] Limit rings 27 are installed on both the left and right inner sides of the first movable bar 18 and the second movable bar 19, and annular grooves 28 are formed inside the limit rings 27. Through grooves are formed in both the first movable bar 18 and the second movable bar 19, and the center lines of the through grooves coincide with the center line of the movable shaft 22. The limit rings 27 are fixed inside the through grooves. By rotating the movable shaft 22, the movable shaft 22 drives the connection disk 23 to rotate, and the connection disk 23 drives the fixed seat 24, the rotating motor 25, and the blade device 26 on the right side to rotate, so that the blade devices 26 on the upper and lower sides on the right side of the connection disk 23 are transposed, thereby facilitating the rapid replacement of the blade device 26. Movable rings 29 are installed on both the left and right sides of the movable shaft 22. The movable rings 29 are clamped in the annular grooves 28 on the limit rings 27, and the movable rings 29 are rotatably connected to the annular grooves 28. When the movable shaft 22 is rotated, the movable rings 29 on the movable shaft 22 rotate along the annular grooves 28 on the limit rings 27, so that the movable shaft 22 is more stable during rotation. Thread grooves 30 are formed on both the upper and lower sides of the left movable ring 29, and the center lines of the thread grooves 30 coincide with the center line of the positioning bolt 31. The positioning bolt 31 is threadedly connected to the thread groove 30. Rotate the movable shaft 22, and the movable shaft 22 drives the movable ring 29 to rotate. Rotate the movable ring 29 until the thread groove 30 above it corresponds to the positioning bolt 31, and then rotate the positioning bolt 31. The positioning bolt 31 moves downward and is connected to the thread groove 30 on the movable ring 29, thereby completing the positioning of the movable shaft 22, and thus realizing the positioning of the blade device 26 on the right side of the movable shaft 22 after transposition. The structure is simple and the operation is convenient. Positioning bolts 31 are installed above both the first movable bar 18 and the second movable bar 19. The positioning bolts 31 are threadedly connected to the first movable bar 18 and the second movable bar 19. Indication lines are arranged on the left side of the first movable bar 18 and the second movable bar 19, and a marking line is arranged on the left side of the movable shaft 22, which is convenient for controlling the rotation amount of the movable shaft 22 when the movable shaft 22 is rotated, so that the thread groove 30 on the movable ring 29 corresponds to the positioning bolt 31.

[0049] Working principle: When using the device for automatically adjusting the blade overlap of the circular shear, first, when it is necessary to adjust the blade overlap amount, start the fine-tuning motor 7. The output shaft of the fine-tuning motor 7 drives the connecting shaft 8 to rotate. When the connecting shaft 8 rotates, it drives the second disk 9 and the first disk 5 to rotate synchronously. The second disk 9 and the first disk 5 drive the arc-shaped groove 10 above them, and the arc-shaped groove 10 drives the first bearing 11 and the second bearing 12 inside it to move relatively or in the opposite direction. The first bearing 11 and the second bearing 12 drive the first connecting column 13 and the second connecting column 14 to move relatively or in the opposite direction, thereby driving the first connecting frame 16 and the second connecting frame 17 connected to the first connecting column 13 and the second connecting column 14 to move relatively or in the opposite direction. The first connecting frame 16 and the second connecting frame 17 drive the first movable bar 18 and the second movable bar 19 to move relatively or in the opposite direction, so as to facilitate the adjustment of the distance between the blade devices 26 provided on the right sides of the first movable bar 18 and the second movable bar 19, thereby realizing the adjustment of the blade overlap amount.

[0050] After the adjustment of the blade overlap amount is completed, energize the electromagnet 21. The electromagnet 21 adsorbs and fixes the first movable bar 18 and the second movable bar 19, thereby improving the installation stability of the first movable bar 18 and the second movable bar 19, and making the blade devices 26 on the right sides of the first movable bar 18 and the second movable bar 19 more stable during shearing.

[0051] By rotating the movable shaft 22, the movable shaft 22 drives the connecting disk 23 to rotate. The connecting disk 23 drives the fixed seat 24, the rotating motor 25 and the blade device 26 on the right side to rotate, so that the blade devices 26 on the upper and lower sides on the right side of the connecting disk 23 are transposed, thereby facilitating the quick replacement of the blade device 26. Among them, when rotating the movable shaft 22, the movable shaft 22 drives the movable ring 29 to rotate. Rotate the movable ring 29 until the thread groove 30 above it corresponds to the positioning bolt 31, and then rotate the positioning bolt 31. The positioning bolt 31 moves downward and is connected to the thread groove 30 on the movable ring 29, thereby completing the positioning of the movable shaft 22, and thus realizing the positioning of the blade device 26 on the right side of the movable shaft 22 after transposition. The structure is simple and the operation is convenient, thus completing a series of work. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0052] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automatic blade overlap adjustment device for a circular shear, comprising a support base (1), a first circular disc (5) and a second circular disc (9). A device main body (2) is installed above the support base (1), and is characterized in that: On the left side of the device main body (2), a transmission shaft (4) is installed through a bearing seat (3), and a first disc (5) is installed on the left side of the transmission shaft (4). A second disc (9) is arranged on the left side of the first disc (5). Arc-shaped grooves (10) are formed on the opposite sides of the first disc (5) and the second disc (9). A first bearing (11) and a second bearing (12) are respectively arranged on the upper and lower sides inside the arc-shaped groove (10). A first connecting column (13) is installed between the first bearings (11) on the first disc (5) and the second disc (9), and a second connecting column (14) is installed between the second bearings (12) on the first disc (5) and the second disc (9). On the reverse sides of the upper and lower second connecting columns (14), a first connecting frame (16) and a second connecting frame (17) are installed through a connecting block (15). A first movable bar (18) and a second movable bar (19) are respectively installed inside the first connecting frame (16) and the second connecting frame (17); A movable shaft (22) penetrates through the first movable bar (18) and the second movable bar (19), and connecting discs (23) are installed on the right sides of the movable shafts (22). Fixed seats (24) are installed on the upper and lower sides on the right side of the connecting disc (23), and a rotating motor (25) is installed on the fixed seat (24). A blade device (26) is installed on the right side of the rotating motor (25) through an output shaft; Limit rings (27) are installed on the left and right sides inside the first movable bar (18) and the second movable bar (19), and annular grooves (28) are formed inside the limit rings (27). Movable rings (29) are installed on the left and right sides of the movable shaft (22). Threaded grooves (30) are formed on the upper and lower sides of the left movable ring (29). Positioning bolts (31) are installed above the first movable bar (18) and the second movable bar (19).

2. The device for automatically adjusting the blade overlap of a circular shear according to claim 1, characterized in that: A connecting frame (6) is installed on the left side of the device main body (2), and a fine-tuning motor (7) is installed on the left side of the connecting frame (6). A connecting shaft (8) is installed on the right side of the fine-tuning motor (7) through an output shaft.

3. The device for automatically adjusting the blade overlap of a circular shear according to claim 2, characterized in that: The connecting shaft (8) is connected to the second disc (9) and the first disc (5), and the first bearing (11) and the second bearing (12) are both in contact with the inner wall of the arc-shaped groove (10).

4. The device for automatically adjusting the blade overlap of a circular shear according to claim 1, wherein: The first movable bar (18) and the second movable bar (19) are respectively fixedly connected to the first connecting frame (16) and the second connecting frame (17). Limit grooves (20) are formed on the upper and lower sides inside the device main body (2). The first movable bar (18) and the second movable bar (19) are both slidably connected to the limit grooves (20).

5. The device for automatically adjusting the blade overlap of a circular shear according to claim 4, characterized in that: Electromagnets (21) are installed on the inner walls of the limit grooves (20). The electromagnets (21) are in contact with the first movable bar (18) and the second movable bar (19), and the electromagnets (21) are adsorbed to the first movable bar (18) and the second movable bar (19).

6. The device for automatically adjusting the blade overlap of a circular shear according to claim 1, characterized in that: The fixed seat (24) is detachably connected to the connecting disc (23), and the blade devices (26) of the upper and lower connecting discs (23) are not on the same vertical plane, and there is an overlapping surface when the blade devices (26) on the upper and lower connecting discs (23) are distributed close to each other.

7. The device for automatically adjusting the blade overlap of a circular shear according to claim 1, characterized in that: Through grooves are provided in both the first movable strip (18) and the second movable strip (19), the center line of the through groove coincides with the center line of the movable shaft (22), and the limiting ring (27) is fixed inside the through groove.

8. The device for automatically adjusting the blade overlap of a circular shear according to claim 1, characterized in that: The movable ring (29) is clamped in the annular groove (28) on the limiting ring (27), and the movable ring (29) is rotatably connected to the annular groove (28).

9. The device for automatically adjusting the blade overlap of a circular shear according to claim 1, wherein: The center line of the threaded groove (30) coincides with the center line of the positioning bolt (31), and the positioning bolt (31) is threadedly connected to the threaded groove (30).

10. The device for automatically adjusting the blade overlap of the circular shear according to claim 1, characterized in that: The positioning bolt (31) is threadedly connected to the first movable strip (18) and the second movable strip (19), indicating lines are provided on the left sides of the first movable strip (18) and the second movable strip (19), and a marking line is provided on the left side of the movable shaft (22).

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