Automatic feeding structure of center surface coiling splitting machine

Abstract

The invention relates to the technical field of center surface coiling and splitting machines, and discloses an automatic feeding structure of a center surface coiling and splitting machine, the automatic feeding structure comprises an air expansion shaft for fixing coil stock and two parallel support plates, and the positions, close to the two ends, of a shaft body of the air expansion shaft are fixedly sleeved with positioning bearings. Rigid collision between the conversion gear and the tensioning gear is avoided through elastic rotation of the conversion gear, additional abrasion between the tensioning gear and the conversion gear is avoided, meanwhile, the whole conversion gear rotates around the axis of the magnetic resistance gear relative to the magnetic resistance gear, collision between the conversion gear and the magnetic resistance gear is avoided, and the transmission efficiency is improved. The limiting oil cylinder drives the movable rod to stretch out and draw back to drive the rotating block, the conversion gear and the magnetic resistance gear to rotate or move, the meshing relation is changed, the meshing face of the magnetic resistance gear is changed, the service life of the magnetic resistance gear is prolonged, the transmission precision and stability of the magnetic powder brake are guaranteed, and the follow-up roll material slitting quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of center surface coiling and slitting machines, in particular to an automatic feeding structure of a center surface coiling and slitting machine. Background Art

[0002] Center surface coiling and slitting machines are commonly used for striping and processing of various roll materials. The center surface coiling and slitting machine tightens the coil and maintains the appropriate tension through tension control and coiling force control, completes the coiling of the coil, and cuts the coil with a knife head by controlling the length and angle of the coil.

[0003] Usually, the feeding mechanism of the center surface winding and slitting machine includes an inflatable shaft and a swing arm for feeding. The operator passes the inflatable shaft through the center of the coil and places the bearings at both ends of the inflatable shaft in the positioning grooves of the swing arm respectively. The swing arm is driven to rotate by the lifting cylinder, thereby driving the inflatable shaft and the coil to rotate and lift. Then, the operator pushes the inflatable shaft into the positioning groove on the bracket plate of the slitting machine, and uses the cylinder on the top of the bracket plate to drive the limit rod to extend to the inner wall of the matching positioning groove to fix the two ends of the inflatable shaft. After completing the threading of the coil, the inflatable shaft is inflated to fix the coil to complete the feeding of the coil. A tensioning gear for controlling the tension is fixedly sleeved on one side of the inflatable shaft. The tensioning gear is meshed with the reluctance gear connected to the output end of the magnetic powder brake. The braking effect of the magnetic powder brake is used to steplessly adjust the tension during the coil slitting process.

[0004] However, when the feeding mechanism of the traditional center surface winding and slitting machine is in use, when the air shaft is pushed into the corresponding fixed position of the positioning groove, the tensioning gear on one side of the air shaft is prone to rigid collision with the reluctance gear, especially when the mass of the coil is large, it is easy to cause additional wear or even damage to the tensioning gear and the reluctance gear, resulting in poor meshing between the tensioning gear and the reluctance gear, increasing the vibration and noise generated by the center surface winding and slitting machine, easily affecting the stability of operation, and reducing the quality of slitting. At the same time, when the detection or maintenance of the damage of the tensioning gear and the reluctance gear is not timely, the transmission accuracy and stability of the magnetic powder brake are reduced, which is easy to cause burrs, tears or uncutting of the coil during the slitting process, thereby reducing the product yield. Summary of the invention

[0005] In view of the shortcomings of the feeding mechanism of the existing center surface winding and slitting machine mentioned in the background technology during use, the present invention provides an automatic feeding structure of the center surface winding and slitting machine, which has the advantages of small impact during the re-engagement process of the tensioning gear and the magnetic resistance gear and long service life, thereby solving the technical problems raised in the above background technology.

[0006] The present invention provides the following technical solutions: an automatic feeding structure of a center surface coiling and slitting machine, comprising an inflatable shaft for fixing a coil and two bracket plates arranged in parallel, the shaft body of the inflatable shaft is fixedly sleeved with positioning bearings near both ends, a swing arm for lifting the inflatable shaft is hingedly connected to one side of the bottom end of the bracket plate, a lifting oil cylinder is hingedly connected to one side of the bracket plate near the top end, a positioning groove is provided at the top end of the bracket plate, a tensioning gear is fixedly sleeved at one end of the inflatable shaft, a limiting oil cylinder is fixedly connected to the top end of the bracket plate, a support seat is fixedly connected to one side of the bracket plate, a mounting plate is arranged on the inner side of the support seat, a magnetic powder brake for adjusting the slitting tension of the coil is fixedly connected to one side of the mounting plate, and a magnetic resistance gear adapted to the tensioning gear is rotatably connected to the output end of the magnetic powder brake;

[0007] A connecting plate is fixedly connected to the midpoint of one side near the bottom end of the mounting plate, a rotating block is hingedly connected to one side of the top end of the connecting plate, a rotating seat is fixedly connected to the top end of the rotating block, a conversion gear matched with the tensioning gear and the magnetic resistance gear is rotatably connected to the inner side of the rotating seat, a No. 2 spring is fixedly connected to one side of the rotating block, and a side plate matched with the No. 2 spring is fixedly connected to one side of the mounting plate.

[0008] Preferably, a limiting block for limiting an initial position of the rotating block is fixedly connected to one side of one of the two bracket plates.

[0009] Preferably, both the reluctance gear and the conversion gear can mesh with the tensioning gear, the rotating block is coaxial with the reluctance gear and the conversion gear meshes with the reluctance gear, the horizontal position of the tensioning gear corresponds to the position of the conversion gear, and the length of the conversion gear is not less than the sum of the lengths of the tensioning gear and the reluctance gear.

[0010] Preferably, a guide rod is fixedly connected to the top of the positioning groove, a sliding block adapted to the positioning bearing is slidably arranged in the positioning groove, a sliding groove adapted to the guide rod is opened at the bottom end of the sliding block, the cross-section of the guide rod is T-shaped and embedded in the sliding groove, and a No. 1 spring is fixedly connected to one side of the sliding block.

[0011] Preferably, the inflatable shaft is fixedly sleeved with a guide ring, the number of the guide rings is set to be several and two are arranged in a group symmetrically about the inflatable shaft tube of the inflatable shaft, and the guide ring is truncated cone-shaped.

[0012] Preferably, the output end of one of the two limit oil cylinders is fixedly connected to a connecting rod, one side of the bottom end of the connecting rod is fixedly connected to a movable rod that cooperates with the rotating block, the mounting plate is slidably connected to the support seat, and one side of the connecting plate is fixedly connected to a tension spring at the midpoint;

[0013] The tension spring is fixedly connected to the corresponding bracket plate, and one side of the rotating block near the top is arranged as an inclined conversion slope. The sliding direction of the mounting plate is parallel to the axis of the tensioning gear, and the inclination direction of the conversion slope is adapted to the sliding direction of the mounting plate. The rotating block is provided with an avoidance slope cooperating with the movable rod near the bottom.

[0014] Preferably, the output end of one of the two limiting cylinders is fixedly connected to a positioning rod, one side of the bottom end of the connecting rod is fixedly connected to a positioning rod, and the distance that the positioning rod corresponding to the connecting rod can be extended and retracted is equal to the distance that the movable rod can be extended and retracted.

[0015] The present invention has the following beneficial effects:

[0016] 1. The present invention drives the entire conversion gear to rotate coaxially relative to the reluctance gear through the No. 2 spring and the rotating block, thereby changing the position of the conversion gear. When the air shaft reaches the positioning position in the positioning groove, when the tensioning gear and the conversion gear are not exactly meshed and come into contact, the conversion gear makes way for the position and when the tensioning gear rotates, the meshing is restored under the action of the No. 2 spring, thereby avoiding possible additional damage caused by rigid collision, ensuring the stability of the meshing between the reluctance gear, the conversion gear and the tensioning gear, and further ensuring the accuracy and stability of the transmission in the subsequent slitting process, and ensuring the quality of the coil slitting.

[0017] 2. The present invention uses a swing arm in conjunction with a sliding block and a No. 1 spring to replace manual labor to push the pneumatic shaft into place in the positioning groove, and cooperates with the elastic contact between the tensioning gear and the conversion gear. While saving manpower, during the translation of the sliding block, the contact position of the pneumatic shaft and the swing arm gradually approaches the hinge between the swing arm and the bracket plate, so that the translation speed of the pneumatic shaft gradually decreases, ensuring the speed when the tensioning gear and the conversion gear are in contact, further reducing the wear between the tensioning gear and the conversion gear, thereby avoiding vibration and noise caused by poor meshing between the gears, and ensuring the stable operation of the subsequent slitting process.

[0018] 3. The present invention makes the entire conversion gear rotate coaxially relative to the reluctance gear, so that the conversion gear will not collide with the reluctance gear when being pushed by the tensioning gear. In addition, in conjunction with the tension spring, the rotating block and the movable rod, under the control of the limit cylinder, the movable block pushes the rotating block to move first and then rotate, so that the conversion gear is disengaged from the meshing with the tensioning gear and the reluctance gear is meshed with the tensioning gear. When the movable rod is moved away, it is reset by the tension of the tension spring. The conversion gear and the reluctance gear guide each other in this process, and by changing the meshing relationship of the reluctance gear, the meshing surface of the reluctance gear is changed, that is, both sides of a single tooth on the reluctance gear can participate in the meshing transmission, thereby increasing the area of ​​the reluctance gear that can rub, further delaying the wear of the reluctance gear, extending the service life of the feeding structure, ensuring the transmission accuracy and stability of the magnetic powder brake, and improving the yield rate in the subsequent slitting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 For the present invention Figure 1 A magnified view of the structure at A;

[0021] Figure 3 For the present invention Figure 1 The structural diagram of the magnetic powder brake;

[0022] Figure 4 For the present invention Figure 3 Schematic diagram of some structures in ;

[0023] Figure 5 For the present invention Figure 4 A top view of the structure in ;

[0024] Figure 6 It is a schematic diagram of the structure of the rotating block of the present invention;

[0025] Figure 7 It is a schematic diagram of the structure of the sliding block of the present invention;

[0026] Figure 8 It is a schematic diagram of the guide ring structure of the present invention.

[0027] In the figure: 1. bracket plate; 2. lifting cylinder; 3. swing arm; 4. sliding groove; 5. limiting cylinder; 6. supporting seat; 7. magnetic powder brake; 8. mounting plate; 9. inflatable shaft; 10. positioning bearing; 11. tensioning gear; 12. guide ring; 13. positioning groove; 14. guide rod; 15. spring No. 1; 16. sliding block; 17. rotating seat; 18. positioning rod; 19. connecting rod; 20. movable rod; 21. conversion gear; 22. magnetic resistance gear; 23. rotating block; 24. limiting block; 25. spring No. 2; 26. side plate; 27. connecting plate; 28. tension spring; 29. ​​conversion ramp; 30. avoidance ramp. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0029] See also Figure 1 and Figure 2 , an automatic feeding structure of a center surface winding and slitting machine, comprising an inflatable shaft 9 for fixing the coil and two parallel bracket plates 1, the bracket plate 1 is fixedly connected to the frame of the center surface winding and slitting machine, the shaft body of the inflatable shaft 9 is fixedly sleeved with positioning bearings 10 near both ends, the inner ring of the positioning bearing 10 is fixedly sleeved with the inflatable shaft 9, the bracket plate 1 is hinged on one side near the bottom end with a swing arm 3 for lifting the inflatable shaft 9, the bracket plate 1 is hinged on one side near the top end with a lifting cylinder 2 for driving the swing arm 3 to rotate, the output end of the lifting cylinder 2 is hinged to the arm body of the swing arm 3 at the midpoint position, and a groove adapted to the inflatable shaft 9 is opened at one end of the swing arm 3, the two ends of the inflatable shaft 9 carrying the coil are respectively placed in the corresponding grooves of the swing arm 3, the lifting cylinder 2 is started, and the lifting cylinder 2 contracts to drive the swing arm 3 to rotate upward, thereby driving the inflatable shaft 9 to rotate and lift.

[0030] See also Figure 1-Figure 5 , (see Figure 1) A positioning groove 13 is provided at the front end of the top of the bracket plate 1, and a tensioning gear 11 is fixedly sleeved on one end of the pneumatic shaft 9. A support seat 6 is fixedly connected to one side of the bracket plate 1, and a mounting plate 8 is slidably provided on the inner side of the support seat 6. A magnetic powder brake 7 for adjusting the coil slitting tension is fixedly connected to one side of the mounting plate 8. The output end of the magnetic powder brake 7 is rotatably connected to a magnetic resistance gear 22 adapted to the tensioning gear 11, and the magnetic resistance gear 22 can engage with the tensioning gear 11. A connecting plate 27 is fixedly connected to the midpoint of one side near the bottom of the mounting plate 8, and the connecting plate 27 is L-shaped. A rotating block 23 is hinged on one side of the top of the connecting plate 27, and a rotating seat 17 is fixedly connected to the top of the rotating block 23, and a conversion gear 21 adapted to the tensioning gear 11 and the magnetic resistance gear 22 is rotatably connected to the inner side of the rotating seat 17.

[0031] The conversion gear 21 can mesh with the tensioning gear 11, the conversion gear 21 meshes with the magnetic resistance gear 22, the rotating block 23 is coaxial with the magnetic resistance gear 22, the rotating block 23 drives the rotating seat 17 to rotate relative to the connecting plate 27, and the rotating seat 17 can drive the conversion gear 21 to rotate around the axis of the magnetic resistance gear 22 without affecting the rotation of the conversion gear 21 itself. During the rotation of the conversion gear 21, it always keeps meshing with the magnetic resistance gear 22. (See Figure 4 ) One side of the rotating block 23 is fixedly connected to a second spring 25, (see Figure 3 ) A side plate 26 that cooperates with the No. 2 spring 25 is fixedly connected to one side of the mounting plate 8. The side plate 26 is fixedly connected to the No. 2 spring 25. The No. 2 spring 25 pushes the rotating block 23 to rotate and tilt. (See Figure 5 ) The horizontal position of the tensioning gear 11 corresponds to the position of the conversion gear 21, and the length of the conversion gear 21 is not less than the sum of the lengths of the tensioning gear 11 and the reluctance gear 22.

[0032] When the locating bearings 10 at both ends of the inflatable shaft 9 reach the corresponding locating positions of the locating grooves 13, the tensioning gear 11 can just mesh with the conversion gear 21. When the tensioning gear 11 collides with the conversion gear 21, the conversion gear 21 rotates around the axis of the magnetic resistance gear 22 to make way. When the tensioning gear 11 rotates, the No. 2 spring 25 pushes the rotating block 23 to rotate and reset, thereby resetting the conversion gear 21 and completing meshing with the tensioning gear 11. The collision between the conversion gear 21 and the tensioning gear 11 is a flexible contact, which reduces the wear between the conversion gear 21 and the tensioning gear 11, and the conversion gear 21 and the magnetic resistance gear 22 always maintain stable meshing without collision, avoiding additional wear of the magnetic resistance gear 22, and avoiding rigid collision and damage between the tensioning gear 11 and the magnetic resistance gear 22, which affects the stability and transmission accuracy of the operation of the center surface winding and slitting machine, thereby ensuring the quality of the coil slitting.

[0033] See also Figure 1-Figure 6A limit block 24 for limiting the initial position of the rotating block 23 is fixedly connected to one side of one of the two bracket plates 1 to prevent the tensioning gear 11 from contacting the conversion gear 21 in advance before the air shaft 9 reaches the positioning position of the positioning groove 13. A tension spring 28 is fixedly connected to one side of the connecting plate 27 at the midpoint. The tension spring 28 is fixedly connected to the corresponding bracket plate 1. A limit cylinder 5 for limiting the positioning bearing 10 is fixedly connected to the top of the bracket plate 1. A connecting rod 19 is fixedly connected to the output end of one of the two limit cylinders 5. The two limit cylinders 5 The output end of another limit cylinder 5 is fixedly connected with a positioning rod 18 that matches the corresponding positioning bearing 10, one side of the bottom end of the connecting rod 19 is fixedly connected with a movable rod 20 that matches the rotating block 23, and the other side of the bottom end of the connecting rod 19 is fixedly connected with a positioning rod 18 for matching the corresponding positioning bearing 10. The side of the rotating block 23 close to the top is set as an inclined conversion slope 29. The sliding direction of the mounting plate 8 is parallel to the axis of the tensioning gear 11, and the inclination direction of the conversion slope 29 is adapted to the sliding direction of the mounting plate 8. The conversion slope 29 is located below the connecting rod 19.

[0034] Start the limit cylinder 5, which directly drives the positioning rod 18 to extend or drives the connecting rod 19 to move, thereby driving the positioning rod 18, so that the distance that the positioning rod 18 corresponding to the connecting rod 19 can be extended and retracted is equal to the distance that the movable rod 20 can be extended and retracted, and the positioning rod 18 extends to the side of the positioning bearing 10 and presses against the side of the positioning bearing 10, thereby positioning the inflatable shaft 9. At this time, the connecting rod 19 drives the movable rod 20 to move until it contacts the conversion inclined surface 29, and the positioning rod 18 can still continue to extend to avoid affecting the movement of the connecting rod 19. The limit cylinder 5 continues to drive the connecting rod 19 to move, and the connecting rod 19 drives the movable rod 20 to move. The bottom end of the movable rod 20 presses against the conversion inclined surface 29 and then pushes the rotating block 23 to move, and the rotating block 23 drives the connecting plate 27 to move, and the connecting plate 27 drives the mounting plate 8 to move, thereby driving the magnetic resistance gear 22 to move synchronously. At this time, the conversion gear 21 plays a guiding role, so that the magnetic resistance gear 22 moves to mesh with the tensioning gear 11.

[0035] The bottom end of the rotating block 23 is provided with an avoidance inclined surface 30 that cooperates with the movable rod 20. The movable rod 20 continues to move and cooperates with the avoidance inclined surface 30, so that the rotating block 23 rotates around the hinge point with the connecting plate 27 and disengages from the tensioning gear 11, thereby causing the tensioning gear 11 to mesh with the magnetic resistance gear 22. The tension spring 28 is used to reset the rotating block 23. At this time, the magnetic resistance gear 22 guides the conversion gear 21 to rotate to mesh with the tensioning gear 11. Since the magnetic resistance gear 22 is directly between the tensioning gear 11 Compared with the indirect transmission between the reluctance gear 22 and the tensioning gear 11 through the conversion gear 21, the contact tooth surfaces between the tensioning gear 11 and the reluctance gear 22 and the contact tooth surfaces between the reluctance gear 22 and the conversion gear 21 are respectively the two sides of a single tooth, thereby changing the gear wear surface of the reluctance gear 22, increasing the wear area that the reluctance gear 22 can transmit, thereby increasing the service life of the reluctance gear 22, and further ensuring the smoothness of the transmission between the reluctance gear 22 and the tensioning gear 11.

[0036] See also Figure 1-Figure 5 , Figure 7 and Figure 8 The top of the positioning groove 13 is fixedly connected with a guide rod 14, and a sliding block 16 adapted to the positioning bearing 10 is slidably arranged in the positioning groove 13. The bottom of the sliding block 16 is provided with a sliding groove 4 adapted to the guide rod 14. The cross section of the guide rod 14 is T-shaped and embedded in the sliding groove 4, guiding the sliding block 16 in the positioning groove 13 and preventing the sliding block 16 from leaving the positioning groove 13. A spring 15 (see Figure 2 ), spring No. 15 is fixedly connected to the corresponding bracket plate 1. When the swing arm 3 drives the inflatable shaft 9 to rise to the height of the positioning groove 13, the inflatable shaft 9 breaks away from the swing arm 3 and rolls onto the sliding block 16. The swing arm 3 continues to move and pushes the inflatable shaft 9 to move, so that the inflatable shaft 9 and the sliding block 16 slide to the corresponding positioning position of the positioning groove 13.

[0037] Since the swing arm 3 is of fixed length, when the swing arm 3 rotates at a uniform speed, the contact point between the swing arm 3 and the inflatable shaft 9 continuously changes toward the direction close to the hinge point between the swing arm 3 and the bracket plate 1, and the speed at which the swing arm 3 pushes the inflatable shaft 9 will continuously decrease, thereby controlling the speed at which the positioning tensioning gear 11 contacts the conversion gear 21 within an appropriate range, further avoiding additional wear caused by collision, and the inflatable shaft 9 moves to the corresponding positioning position of the positioning groove 13 without the assistance of an operator, saving manpower and reducing production costs. The No. 1 spring 15 is used for resetting the sliding block 16, and the inflatable shaft 9 is fixedly sleeved with a guide ring 12, the number of the guide rings 12 is set to be several and they are symmetrically arranged in groups of two about the inflatable shaft tube of the inflatable shaft 9, and the guide ring 12 is truncated cone-shaped, and the two guide rings 12 cooperate to facilitate the inflatable shaft 9 to overlap in the groove of the swing arm 3, and the spacing between the two matching guide rings 12 is adapted to the width of the swing arm 3, and to ensure that when the inflatable shaft 9 rolls onto the sliding block 16, the inflatable shaft 9 is guided to move relative to the swing arm 3.

[0038] The method of use (working principle) of the present invention is as follows:

[0039] The inflatable shaft 9 passes through the center of the coil, and the two ends of the inflatable shaft 9 are swung to the top of the corresponding grooves of the swing arm 3, and the lifting cylinder 2 is started to drive the swing arm 3 to rotate, thereby lifting the inflatable shaft 9. After the inflatable shaft 9 is lifted to the height corresponding to the positioning groove 13, it rolls onto the sliding block 16. The swing arm 3 continues to move and drives the inflatable shaft 9 to move to the tensioning gear 11 and the conversion gear 21 under the condition of continuously decreasing speed. The limiting cylinder 5 is started to limit the positioning bearings 10 on both sides of the tensioning gear 11 by the two positioning rods 18 respectively. When the tensioning gear 11 and the conversion gear 21 are not accurately meshed, the conversion gear 21 is pushed. When the tensioning gear 11 rotates, under the push of the No. 2 spring 25, the conversion gear 21 re-meshes with the tensioning gear 11, and then the inflatable shaft 9 is expanded to complete the loading of the coil.

[0040] When the meshing wear surface of the reluctance gear 22 needs to be changed, the limit cylinder 5 is further extended, and the movable rod 20 cooperates with the conversion bevel 29 and the avoidance bevel 30 of the rotating block 23 to push the conversion gear 21 and the reluctance gear 22 to move synchronously, so that the reluctance gear 22 is meshed with the tensioning gear 11, and the conversion gear 21 is rotated to disengage from the tensioning gear 11.

Claims

1. An automatic feeding structure of a center surface winding and slitting machine, comprising an inflatable shaft (9) for fixing a coil and two parallel bracket plates (1), the shaft body of the inflatable shaft (9) is fixedly sleeved with positioning bearings (10) near both ends, the side of the bracket plate (1) near the bottom end is hinged with a swing arm (3) for lifting the inflatable shaft (9), the side of the bracket plate (1) near the top end is hinged with a lifting cylinder (2), the top end of the bracket plate (1) is provided with a positioning groove (13), one end of the inflatable shaft (9) is fixedly sleeved with a tensioning gear (11), and the top end of the bracket plate (1) is fixedly connected to a limiting cylinder (5), characterized in that: A support seat (6) is fixedly connected to one side of the support plate (1), a mounting plate (8) is arranged on the inner side of the support seat (6), a magnetic powder brake (7) for adjusting the coil slitting tension is fixedly connected to one side of the mounting plate (8), and a magnetic resistance gear (22) adapted to the tensioning gear (11) is rotatably connected to the output end of the magnetic powder brake (7); A connecting plate (27) is fixedly connected to the midpoint of one side near the bottom end of the mounting plate (8); a rotating block (23) is hingedly connected to one side of the top end of the connecting plate (27); a rotating seat (17) is fixedly connected to the top end of the rotating block (23); a conversion gear (21) adapted to the tensioning gear (11) and the magnetic resistance gear (22) is rotatably connected to the inner side of the rotating seat (17); a No. 2 spring (25) is fixedly connected to one side of the rotating block (23); and a side plate (26) matched with the No. 2 spring (25) is fixedly connected to one side of the mounting plate (8).

2. The automatic feeding structure of the center surface coiling and slitting machine according to claim 1 is characterized by: A limiting block (24) for limiting the initial position of the rotating block (23) is fixedly connected to one side of one of the two supporting plates (1).

3. The automatic feeding structure of the center surface coiling and slitting machine according to claim 1 is characterized by: The magnetic resistance gear (22) and the conversion gear (21) are both capable of meshing with the tensioning gear (11); the rotating block (23) is coaxial with the magnetic resistance gear (22) and the conversion gear (21) is meshing with the magnetic resistance gear (22); the horizontal position of the tensioning gear (11) corresponds to the position of the conversion gear (21); and the length of the conversion gear (21) is not less than the sum of the lengths of the tensioning gear (11) and the magnetic resistance gear (22).

4. The automatic feeding structure of the center surface coiling and slitting machine according to claim 3 is characterized by: The top end of the positioning groove (13) is fixedly connected to a guide rod (14); a sliding block (16) adapted to the positioning bearing (10) is slidably arranged in the positioning groove (13); a sliding groove (4) adapted to the guide rod (14) is provided at the bottom end of the sliding block (16); the guide rod (14) has a T-shaped cross section and is embedded in the sliding groove (4); and a No. 1 spring (15) is fixedly connected to one side of the sliding block (16).

5. The automatic feeding structure of the center surface coiling and slitting machine according to claim 4 is characterized by: The inflatable shaft (9) is fixedly sleeved with a guide ring (12), the number of the guide rings (12) is set to be several and two are arranged in a group symmetrically about the inflatable shaft tube of the inflatable shaft (9), and the guide ring (12) is in a truncated cone shape.

6. The automatic feeding structure of the center surface coiling and slitting machine according to claim 3 is characterized by: The output end of one of the two limit oil cylinders (5) is fixedly connected to a connecting rod (19), one side of the bottom end of the connecting rod (19) is fixedly connected to a movable rod (20) that cooperates with a rotating block (23), the mounting plate (8) is slidably connected to the support seat (6), and one side of the connecting plate (27) is fixedly connected to a tension spring (28) at the midpoint; The tension spring (28) is fixedly connected to the corresponding bracket plate (1); a side of the rotating block (23) close to the top is provided with an inclined conversion slope (29); the sliding direction of the mounting plate (8) is parallel to the axis of the tensioning gear (11); the inclined direction of the conversion slope (29) is adapted to the sliding direction of the mounting plate (8); and a avoiding slope (30) cooperating with the movable rod (20) is provided at the bottom of the rotating block (23).

7. The automatic feeding structure of the center surface coiling and slitting machine according to claim 6 is characterized by: The output end of one of the two limiting oil cylinders (5) is fixedly connected to a positioning rod (18), and one side of the bottom end of the connecting rod (19) is fixedly connected to a positioning rod (18), and the distance that the positioning rod (18) corresponding to the connecting rod (19) can be extended and retracted is equal to the distance that the movable rod (20) can be extended and retracted.

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