Double-end wrapping machine

Abstract

The utility model relates to the technical field of cable production equipment, in particular to a double-end wrapping machine, which comprises a rack, a cradle, a first rotating shaft, a second rotating shaft, a rotation driving mechanism and a wire passing pipe, the cradle is provided with a tape releasing cavity and a tape winding cavity, the first rotating shaft is provided with a wire inlet hole, and the second rotating shaft is provided with a wire outlet hole. Two tape releasing mechanisms and two buffering tape winding roller sets are arranged in the tape releasing cavity in a central symmetry mode, two via holes are formed in the middle of the cradle, and two tape winding adjusting mechanisms are arranged in the tape winding cavity in a central symmetry mode. The winding belt adjusting mechanism comprises a guide rod, an adjusting seat connected to the guide rod in a sliding mode, a locking piece used for locking the adjusting seat to the guide rod, a belt guiding roller connected to one end of the adjusting seat in a rotating mode, a lifting adjusting module arranged at the other end of the adjusting seat and a steering winding roller set arranged at the lifting end of the lifting adjusting module. The two wrapping tapes are wrapped on the core wire at the same time, the positions and angles of the wrapping tapes are adjustable, the wrapping quality is improved, maintenance is convenient, and dynamic balance is good when the cradle rotates.

Description

Technical Field

[0001] The utility model relates to the technical field of wire and cable production equipment, in particular to a double-head wrapping machine. Background Art

[0002] In the existing patent, the applicant applied for a Chinese patent document with the application number 201811295065.8 on November 01, 2018, which discloses a horizontal multi-head tape wrapping machine, including a machine base. A wire releasing mechanism for releasing and rotating a wire is provided on the machine base. The wire releasing mechanism includes a winding area for a tape to be wound around the wire. The machine base is provided with a tape releasing mechanism for carrying and releasing the tape, a tape guiding mechanism for guiding the tape of the tape releasing mechanism to the winding area, and a tensioning mechanism for adjusting the tension of the tape located on the tape guiding mechanism. Although this patent document can realize the wrapping of two or more wrapping tapes, it cannot adjust the position and angle of the wrapping tape, making it difficult to ensure that the wrapping tape fits flatly around the core wire, which is not conducive to improving the quality of wrapping. Therefore, the defect is very obvious and a solution is urgently needed. Summary of the Utility Model

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a double-head wrapping machine.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A double-head wrapping machine includes a frame, a cradle rotatably arranged in the frame, a first rotating shaft arranged at one end of the cradle and rotatably connected to the frame, a second rotating shaft arranged at the other end of the cradle and rotatably connected to the frame, a rotating driving mechanism installed on the frame and used to drive the first rotating shaft to rotate, and a wire passing tube arranged in the middle of the cradle. The cradle is provided with a tape releasing cavity and a tape winding cavity. The tape releasing cavity is communicated with the tape winding cavity via the wire passing tube. The first rotating shaft, the wire passing tube and the second rotating shaft are coaxially arranged. The first rotating shaft is provided with an inlet hole communicated with the tape releasing cavity, and the second rotating shaft is provided with an outlet hole communicated with the tape winding cavity. Two tape releasing mechanisms and two buffer tape winding roller groups are symmetrically arranged at the center in the tape releasing cavity. Two through holes are opened in the middle of the cradle. Two tape winding adjusting mechanisms are symmetrically arranged at the center in the tape winding cavity. One tape releasing mechanism, one buffer tape winding roller group, one through hole and one tape winding adjusting mechanism are correspondingly arranged. The tape winding adjusting mechanism includes a guide rod installed in the tape winding cavity, an adjusting seat slidably connected to the guide rod, a locking member for locking the adjusting seat on the guide rod, a tape guiding roller rotatably connected to one end of the adjusting seat, a lifting adjusting module installed at the other end of the adjusting seat, and a steering wrapping roller group installed at the lifting end of the lifting adjusting module.

[0006] Further, the steering wrapping roller group includes an installation frame installed at the lifting end of the lifting adjusting module and two steering wrapping rollers rotatably connected to the installation frame in parallel up and down.

[0007] Further, the lifting adjustment module includes a mounting seat installed on the adjustment seat, a lead screw rotatably connected to the mounting seat, a lifting seat threadedly connected to the lead screw and slidably connected to the mounting seat in a lifting manner, and a driving member installed at one end of the lead screw and used to drive the lead screw to rotate. The mounting frame is installed on the lifting seat, and the steering winding roller is perpendicular to the tape guiding roller.

[0008] Further, the buffer winding roller group includes a fixed seat installed on the inner wall of the tape feeding cavity, a sliding rod arranged on the fixed seat, a buffer seat slidably connected to the sliding rod, a spring sleeved on the sliding rod, a buffer roller rotatably connected to the buffer seat, and a winding roller rotatably connected to the fixed seat. The winding roller and the buffer roller are arranged vertically offset, and both ends of the spring are elastically abutted against the fixed seat and the buffer seat respectively.

[0009] Further, a limiting guide roller is rotatably connected at the through hole.

[0010] Further, the tape feeding mechanism includes a rotating sleeve rotatably penetrating through the side wall of the cradle, a threaded pull rod slidably penetrating through the inner hole of the rotating sleeve, a fixed disk installed at the inner end of the rotating sleeve and located inside the tape feeding cavity, a locking ring threadedly sleeved on the outer end of the threaded pull rod and located outside the cradle, and a movable disk detachably installed at the inner end of the threaded pull rod and arranged parallel to the fixed disk.

[0011] Further, a tensioning head is arranged at the inner end of the threaded pull rod. The diameter of the tensioning head is larger than that of the threaded pull rod. A countersunk head pulling hole is arranged at the central position of the movable disk. The tensioning head can be clamped in the countersunk head pulling hole. The movable disk is also provided with a disassembly and assembly hole communicated with the countersunk head pulling hole. The aperture of the disassembly and assembly hole is larger than that of the tensioning head. The threaded pull rod can move between the countersunk head pulling hole and the disassembly and assembly hole.

[0012] Further, a toothed disk is installed at the inner end of the rotating sleeve. The toothed disk is located on the side of the fixed disk away from the movable disk. The cradle is provided with a hysteresis tensioner. A gear is sleeved on the output shaft of the hysteresis tensioner. The gear is in transmission engagement with the toothed disk.

[0013] Further, a limiting cover is sleeved on the outer end of the threaded pull rod.

[0014] Further, a handle is arranged on the circumferential side of the locking ring.

[0015] Advantages of the present utility model: In practical applications, the core wire sequentially passes through the inlet hole, tape feeding cavity, wire passing tube, tape winding cavity, and outlet hole. Two winding tape reels are respectively installed on two tape feeding mechanisms. The winding tape of the tape feeding mechanism passes through the buffer tape winding roller group and then through the through hole, and then sequentially passes through the tape guiding roller and the turning winding roller group of the tape winding adjustment mechanism. The turning winding roller group changes the direction of the winding tape, so that the winding tapes on both sides are wound around the core wire. As the rotation driving mechanism drives the first rotating shaft to rotate, the rotating first rotating shaft drives the cradle to rotate, so that the winding tapes on both sides are continuously wound around the core wire. Before winding, loosen the locking member so that the adjustment seat can move along the guide rod to adjust the horizontal positions of the adjustment seat, the tape guiding roller, and the turning winding roller group. After the horizontal position adjustment is completed, tighten the locking member to lock the adjustment seat. The lifting adjustment module can adjust the height of the turning winding roller group, so that the angle at which the winding tape is wound around the core wire can be adjusted, so that the winding tape can be smoothly attached and wound on the surface of the core wire, improving the winding quality. Since the two tape winding adjustment mechanisms, the two buffer tape winding roller groups, and the two tape feeding mechanisms are all centrosymmetrically arranged, it is convenient for the operator to operate on one side of the cradle (such as threading and maintenance), and it is also beneficial to the dynamic balance of the cradle during rotation. The present utility model winds two winding tapes around the core wire at the same time. The position and angle of the winding tape are adjustable, improving the winding quality, being convenient for maintenance, and having good dynamic balance during the rotation of the cradle. Brief Description of the Drawings

[0016] Figure 1 is a three-dimensional structural schematic diagram of the present utility model.

[0017] Figure 2 is a three-dimensional structural schematic diagram of the present utility model with the frame hidden.

[0018] Figure 3 is a three-dimensional structural schematic diagram of the tape winding adjustment mechanism of the present utility model.

[0019] Figure 4 is a three-dimensional structural schematic diagram of the buffer tape winding roller group of the present utility model.

[0020] Figure 5 is a three-dimensional structural schematic diagram of the tape feeding mechanism of the present utility model.

[0021] Figure 6 is a sectional view of the tape feeding mechanism of the present utility model.

[0022] Figure 7 is an exploded structural schematic diagram of the movable disk and the threaded pull rod of the present utility model.

[0023] Description of the Reference Numerals:

[0024] 1. Frame; 2. Cradle; 3. First rotating shaft; 4. Second rotating shaft; 5. Rotating drive mechanism; 6. Wire passing tube; 7. Tape releasing cavity; 8. Tape winding cavity; 9. Inlet hole; 10. Outlet hole; 11. Tape releasing mechanism; 12. Buffer tape winding roller group; 13. Through hole; 14. Tape winding adjustment mechanism; 15. Guide rod; 16. Adjusting seat; 17. Locking piece; 18. Tape guiding roller; 19. Lifting adjustment module; 20. Steering and winding roller group; 21. Mounting frame; 22. Steering and winding roller; 23. Mounting seat; 24. Lead screw; 25. Lifting seat; 26. Driving part; 27. Fixed seat; 28. Slide bar; 29. Buffer seat; 30. Spring; 31. Buffer roller; 32. Tape winding roller; 33. Limit guiding roller; 34. Rotating sleeve; 35. Threaded pull rod; 36. Fixed disk; 37. Locking ring; 38. Movable disk; 39. Tightening head; 40. Countersunk head pulling hole; 41. Disassembly and assembly hole; 42. Tooth disk; 43. Hysteresis tensioner; 44. Gear; 45. Limit cover; 46. Handle. Detailed implementation manner

[0025] For the convenience of understanding by those skilled in the art, the present utility model will be further described below in conjunction with embodiments and the accompanying drawings. The content mentioned in the implementation manner does not limit the present utility model.

[0026] As Figures 1 to 7 shown, a double-headed winding machine provided by the present utility model includes a frame 1, a cradle 2 rotatably arranged in the frame 1, a first rotating shaft 3 arranged at one end of the cradle 2 and rotatably connected to the frame 1, a second rotating shaft 4 arranged at the other end of the cradle 2 and rotatably connected to the frame 1, a rotating drive mechanism 5 installed on the frame 1 and used to drive the first rotating shaft 3 to rotate, and a wire passing tube 6 arranged in the middle of the cradle 2. The cradle 2 is provided with a tape releasing cavity 7 and a tape winding cavity 8. The tape releasing cavity 7 is communicated with the tape winding cavity 8 via the wire passing tube 6. The first rotating shaft 3, the wire passing tube 6 and the second rotating shaft 4 are coaxially arranged. The first rotating shaft 3 is provided with an inlet hole 9 communicated with the tape releasing cavity 7, and the second rotating shaft 4 is provided with an outlet hole 10 communicated with the tape winding cavity 8. Two tape releasing mechanisms 11 and two buffer tape winding roller groups 12 are symmetrically arranged at the center in the tape releasing cavity 7. Two through holes 13 are opened in the middle of the cradle 2. Two tape winding adjustment mechanisms 14 are symmetrically arranged at the center in the tape winding cavity 8. One tape releasing mechanism 11, one buffer tape winding roller group 12, one through hole 13 and one tape winding adjustment mechanism 14 are correspondingly arranged. The tape winding adjustment mechanism 14 includes a guide rod 15 installed in the tape winding cavity 8, an adjusting seat 16 slidably connected to the guide rod 15, a locking piece 17 for locking the adjusting seat 16 on the guide rod 15, a tape guiding roller 18 rotatably connected to one end of the adjusting seat 16, a lifting adjustment module 19 installed at the other end of the adjusting seat 16, and a steering and winding roller group 20 installed at the lifting end of the lifting adjustment module 19. Specifically, the locking piece 17 can adopt a bolt, and the rotating drive mechanism 5 can adopt a transmission structure of a motor, a synchronous belt and a synchronous pulley.

[0027] In practical applications, the core wire sequentially passes through the inlet hole 9, the tape-releasing cavity 7, the wire passing tube 6, the tape-winding cavity 8, and the outlet hole 10. Two winding tape reels are respectively installed on two tape-releasing mechanisms 11. The winding tape of the tape-releasing mechanism 11 passes through the buffer tape-winding roller group 12 and then through the through-hole 13, and then sequentially passes through the guide tape roller 18 and the turning tape-winding roller group 20 of the tape-winding adjustment mechanism 14. The turning tape-winding roller group 20 changes the direction of the winding tape, so that the winding tapes on both sides are wound around the core wire. As the rotation driving mechanism 5 drives the first rotating shaft 3 to rotate, the rotating first rotating shaft 3 drives the cradle 2 to rotate, so that the winding tapes on both sides are continuously wound around the core wire. Before winding, loosen the locking member 17 so that the adjustment seat 16 can move along the guide rod 15 to adjust the horizontal positions of the adjustment seat 16, the guide tape roller 18, and the turning tape-winding roller group 20. After the horizontal position adjustment is completed, tighten the locking member 17 to lock the adjustment seat 16. The lifting adjustment module 19 can adjust the height of the turning tape-winding roller group 20, so as to adjust the angle at which the winding tape is wound around the core wire, so that the winding tape can be smoothly attached to and wound around the surface of the core wire, improving the winding quality. Since the two tape-winding adjustment mechanisms 14, the two buffer tape-winding roller groups 12, and the two tape-releasing mechanisms 11 are all centrally symmetrically arranged, it is convenient for the operator to operate on one side of the cradle 2 (such as threading and maintenance), and it is also beneficial to the dynamic balance of the cradle 2 during rotation. The utility model simultaneously winds two winding tapes around the core wire, improving the production efficiency. The position and angle of the winding tape are adjustable, improving the winding quality, and it is convenient for maintenance, and the dynamic balance of the cradle 2 during rotation is good.

[0028] In this embodiment, the turning tape-winding roller group 20 includes a mounting frame 21 installed at the lifting end of the lifting adjustment module 19 and two turning tape-winding rollers 22 rotatably connected to the mounting frame 21 in parallel up and down. The winding tape passes between the two turning tape-winding rollers 22 after passing through the guide tape roller 18, so that the winding tape changes direction and is wound around the core wire.

[0029] In this embodiment, the lifting adjustment module 19 includes a mounting seat 23 installed on the adjustment seat 16, a lead screw 24 rotatably connected to the mounting seat 23, a lifting seat 25 threadedly connected to the lead screw 24 and slidably connected to the mounting seat 23 in a lifting manner, and a driving member 26 installed at one end of the lead screw 24 and used to drive the lead screw 24 to rotate. The mounting frame 21 is installed on the lifting seat 25, and the turning tape-winding roller 22 is vertically arranged with respect to the guide tape roller 18; specifically, the driving member 26 can adopt a crank.

[0030] In practical applications, the driving member 26 drives the lead screw 24 to rotate, the rotating lead screw 24 drives the lifting seat 25 to slide up and down along the mounting seat 23, and the lifting and sliding lifting seat 25 drives the mounting frame 21 and the two turning tape-winding rollers 22 to lift, so as to adjust the height of the winding tape.

[0031] In this embodiment, the buffer tape winding roller group 12 includes a fixed seat 27 installed on the inner wall of the tape feeding cavity 7, a slide bar 28 arranged on the fixed seat 27, a buffer seat 29 slidably connected to the slide bar 28, a spring 30 sleeved on the slide bar 28, a buffer roller 31 rotatably connected to the buffer seat 29, and a tape winding roller 32 rotatably connected to the fixed seat 27. The tape winding roller 32 and the buffer roller 31 are arranged vertically offset. The two ends of the spring 30 are elastically abutted against the fixed seat 27 and the buffer seat 29 respectively. In practical applications, the wrapping tape first winds around the tape winding roller 32, then winds around the buffer roller 31, passes through the through hole 13, and then winds around the tape guiding roller 18. During the process of winding the wrapping tape around the core wire, the buffer tape winding roller group 12 plays a buffering role for the wrapping tape.

[0032] In this embodiment, a limiting guide roller 33 is rotatably connected at the through hole 13. The limiting guide roller 33 plays a guiding and limiting role for the wrapping tape to prevent the wrapping tape from swinging.

[0033] In this embodiment, the tape feeding mechanism 11 includes a rotating sleeve 34 rotatably penetrating through the side wall of the cradle 2, a threaded pull rod 35 slidably penetrating through the inner hole of the rotating sleeve 34, a fixed disk 36 installed at the inner end of the rotating sleeve 34 and located inside the tape feeding cavity 7, a locking ring 37 threadedly sleeved on the outer end of the threaded pull rod 35 and located outside the cradle 2, and a movable disk 38 detachably installed at the inner end of the threaded pull rod 35 and arranged parallel to the fixed disk 36. Specifically, a tension head 39 is arranged at the inner end of the threaded pull rod 35. The diameter of the tension head 39 is larger than that of the threaded pull rod 35. A countersunk head pull hole 40 is arranged at the central position of the movable disk 38. The tension head 39 can be clamped in the countersunk head pull hole 40. The movable disk 38 is further provided with a disassembly and assembly hole 41 communicating with the countersunk head pull hole 40. The aperture of the disassembly and assembly hole 41 is larger than the diameter of the tension head 39. The threaded pull rod 35 can move between the countersunk head pull hole 40 and the disassembly and assembly hole 41.

[0034] In practical applications, the material tray is installed between the fixed disk 36 and the movable disk 38. When the locking ring 37 is in a tightened state, the threaded pull rod 35 tightens the movable disk 38, so that the movable disk 38 clamps the material tray on the fixed disk 36. The movable disk 38, the material tray and the fixed disk 36 can rotate synchronously with the rotating sleeve 34. At this time, the tension head 39 is clamped in the countersunk head pull hole 40. When the material tray needs to be replaced, loosen the locking ring 37, so that the threaded pull rod 35 can move relative to the rotating sleeve 34 until the tension head 39 moves out of the countersunk head pull hole 40, and then move the threaded pull rod 35 from the countersunk head pull hole 40 to the disassembly and assembly hole 41, so that the tension head 39 is aligned with the disassembly and assembly hole 41, and then the movable disk 38 can be pulled off the threaded pull rod 35. After replacing the new material tray, install the movable disk 38 again. After installing the movable disk 38, tighten the locking ring 37, so that the threaded pull rod 35 tightens the movable disk 38 and the tension head 39 is clamped in the countersunk head pull hole 40. This structural design facilitates the disassembly and assembly of the material tray.

[0035] In this embodiment, a toothed disc 42 is installed at the inner end of the rotating sleeve 34. The toothed disc 42 is located on the side of the fixed disc 36 away from the movable disc 38. The cradle 2 is equipped with a hysteresis tensioner 43. A gear 44 is sleeved on the output shaft of the hysteresis tensioner 43. The gear 44 is in transmission engagement with the toothed disc 42. The tension of the tape feeding of the material disc is controlled by the hysteresis tensioner 43 to keep the tension of the wrapping tape constant.

[0036] In this embodiment, a limit cap 45 is sleeved on the outer end of the threaded pull rod 35; the limit cap 45 can prevent the threaded pull rod 35 from detaching from the rotating sleeve 34.

[0037] In this embodiment, a handle 46 is provided on the circumferential side of the locking ring 37. The provision of the handle 46 facilitates the operator to rotate the locking ring 37.

[0038] All the technical features in this embodiment can be freely combined according to actual needs.

[0039] The above embodiment is a preferred implementation scheme of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the technical solution is within the protection scope of the present invention.

Claims

1. A double-headed wrapping machine, characterized in that: It includes a frame (1), a cradle (2) rotatably arranged inside the frame (1), a first rotating shaft (3) arranged at one end of the cradle (2) and rotatably connected to the frame (1), a second rotating shaft (4) arranged at the other end of the cradle (2) and rotatably connected to the frame (1), a rotating drive mechanism (5) installed on the frame (1) and used to drive the first rotating shaft (3) to rotate, and a wire passing pipe (6) arranged in the middle of the cradle (2). The cradle (2) is provided with a tape releasing cavity (7) and a tape winding cavity (8). The tape releasing cavity (7) is communicated with the tape winding cavity (8) through the wire passing pipe (6). The first rotating shaft (3), the wire passing pipe (6) and the second rotating shaft (4) are coaxially arranged. The first rotating shaft (3) is provided with an inlet hole (9) communicated with the tape releasing cavity (7). The second rotating shaft (4) is provided with an outlet hole (10) communicated with the tape winding cavity (8). Two tape releasing mechanisms (11) and two buffer tape winding roller groups (12) are symmetrically arranged at the center in the tape releasing cavity (7). Two through holes (13) are opened in the middle of the cradle (2). Two tape winding adjusting mechanisms (14) are symmetrically arranged at the center in the tape winding cavity (8). One tape releasing mechanism (11), one buffer tape winding roller group (12), one through hole (13) and one tape winding adjusting mechanism (14) are correspondingly arranged. The tape winding adjusting mechanism (14) includes a guide rod (15) installed in the tape winding cavity (8), an adjusting seat (16) slidably connected to the guide rod (15), a locking member (17) for locking the adjusting seat (16) on the guide rod (15), a guide tape roller (18) rotatably connected to one end of the adjusting seat (16), a lifting adjustment module (19) installed at the other end of the adjusting seat (16), and a turning and winding roller group (20) installed at the lifting end of the lifting adjustment module (19).

2. The double-head wrapping machine according to claim 1, characterized in that: The turning and winding roller group (20) includes a mounting frame (21) installed at the lifting end of the lifting adjustment module (19) and two turning and winding rollers (22) rotatably connected to the mounting frame (21) in parallel up and down.

3. The double - head wrapping machine according to claim 2, characterized in that: The lifting adjustment module (19) includes a mounting seat (23) installed on the adjusting seat (16), a lead screw (24) rotatably connected to the mounting seat (23), a lifting seat (25) threadedly connected to the lead screw (24) and slidably connected to the mounting seat (23) in a lifting manner, and a driving member (26) installed at one end of the lead screw (24) and used to drive the lead screw (24) to rotate. The mounting frame (21) is installed on the lifting seat (25). The turning and winding roller (22) is perpendicularly arranged to the guide tape roller (18).

4. A double-head wrapping machine according to claim 1, characterized in that: The buffer tape winding roller group (12) includes a fixed seat (27) installed on the inner wall of the tape releasing cavity (7), a slide bar (28) arranged on the fixed seat (27), a buffer seat (29) slidably connected to the slide bar (28), a spring (30) sleeved on the slide bar (28), a buffer roller (31) rotatably connected to the buffer seat (29), and a tape winding roller (32) rotatably connected to the fixed seat (27). The tape winding roller (32) and the buffer roller (31) are arranged in a vertical offset manner. Two ends of the spring (30) are elastically abutted against the fixed seat (27) and the buffer seat (29) respectively.

5. The double - head wrapping machine according to claim 1, characterized in that: A limiting guide roller (33) is rotatably connected at the through hole (13).

6. The double-head wrapping machine according to claim 1, characterized in that: The tape feeding mechanism (11) includes a rotating sleeve (34) penetrating through the side wall of the cradle (2), a threaded pull rod (35) sliding through the inner hole of the rotating sleeve (34), a fixed disk (36) installed at the inner end of the rotating sleeve (34) and located inside the tape feeding cavity (7), a locking ring (37) threadedly sleeved on the outer end of the threaded pull rod (35) and located outside the cradle (2), and a movable disk (38) detachably installed at the inner end of the threaded pull rod (35) and arranged parallel to the fixed disk (36).

7. A double - head wrapping machine according to claim 6, characterized in that: A tension head (39) is provided at the inner end of the threaded pull rod (35). The diameter of the tension head (39) is larger than that of the threaded pull rod (35). A counterbore pulling hole (40) is provided at the central position of the movable disk (38). The tension head (39) can be clamped in the counterbore pulling hole (40). The movable disk (38) is further provided with a disassembly and assembly hole (41) communicating with the counterbore pulling hole (40). The aperture of the disassembly and assembly hole (41) is larger than the diameter of the tension head (39). The threaded pull rod (35) can move between the counterbore pulling hole (40) and the disassembly and assembly hole (41).

8. A double - head wrapping machine according to claim 6, characterized in that: A toothed disk (42) is installed at the inner end of the rotating sleeve (34). The toothed disk (42) is located on the side of the fixed disk (36) away from the movable disk (38). The cradle (2) is provided with a hysteresis tensioner (43). A gear (44) is sleeved on the output shaft of the hysteresis tensioner (43). The gear (44) is in transmission engagement with the toothed disk (42).

9. The double-head wrapping machine according to claim 6, wherein: A limit cover (45) is sleeved on the outer end of the threaded pull rod (35).

10. A double-headed wrapping machine according to claim 6, characterized in that: A handle (46) is provided on the circumferential side of the locking ring (37).

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