A tape unwinding device with a self-locking function

Abstract

The present invention provides a tape unwinding device with a self-locking function. When the tape is unwound, under the action of the tape tension, the swing arm swings to separate the plug from the dial card. Then, under the action of the second torsion spring, the dial card swings to insert into the tooth groove of the gear disk. At the same time, the tape unwinding can drive the gear disk to rotate. During the rotation of the gear disk, the guiding surface at the end of the dial card is pushed out of the tooth groove. Then, the dial card is inserted into the next tooth groove of the gear groove again under the action of the second torsion spring. Such a cycle is beneficial to reducing the rotational acceleration during unwinding and improving the unwinding stability. When the tape unwinding ends and the tape is not under external force, the gear disk stops rotating. At the same time, the swing arm swings under the action of the first torsion spring to insert the plug into the limit groove of the dial card and push the end of the dial card into the tooth groove, realizing that the dial card locks the gear disk, so that the film cannot rotate and continue to unwind, realizing the self-locking fixation of the film fixed outside the outer shaft to avoid the tape from spreading due to the rotation of the film.

Description

Technical Field

[0001] The present invention relates to the field of unwind device structures, and particularly to a tape unwind device with a self-locking function. Background Art

[0002] A tape is composed of two parts: a base material and an adhesive. By bonding, two or more non-connected objects are joined together. A layer of adhesive is coated on its surface, and the adhesive has two types: self-adhesive and sticky after being wetted with water.

[0003] When using tape for sealing boxes, the film (i.e., the whole roll of tape) is installed on the box sealer, and then the tape is pulled out for use, which can improve the efficiency of tape box sealing. Among them, the film is generally directly sleeved outside a shaft body so that the film can rotate, thus facilitating the extraction of the tape. However, since the tape that becomes sticky after being wetted with water (hereinafter referred to as wet tape) has no adhesive binding between layers in the film, the tape in the film will spread out after unwinding, resulting in poor stability when pulling the tape later. Summary of the Invention

[0004] In view of the deficiencies mentioned in the above background art, the present invention provides a tape unwind device with a self-locking function.

[0005] The present invention adopts the following technical solutions:

[0006] A tape unwind device with a self-locking function, characterized in that the device includes:

[0007] An outer shaft rotatably connected to the mounting frame, with the film sleeved on the outer shaft so that the film is fixed relative to the outer shaft;

[0008] A gear disc fixedly connected to the outer shaft;

[0009] A dial rotatably connected to the mounting frame, with a first torsion spring connected between the dial and the mounting frame. The torsion of the first torsion spring pulls the dial to swing towards the gear disc so that the dial swings to insert into the tooth groove of the gear disc;

[0010] An oscillating arm rotatably connected to the mounting frame, with a transmission roller provided at one end of the oscillating arm. After the tape is pulled out, it bypasses the transmission roller, so that the tape pulls the transmission roller and drives the oscillating arm to swing in a direction away from the dial;

[0011] Wherein, a plug is further provided on one side of the oscillating arm. When the tape is not pulled out, the oscillating arm swings so that the plug abuts against the end of the dial away from the inserted tooth groove, causing the dial to swing to insert into the tooth groove.

[0012] In a possible implementation, the mounting frame fixes a bearing seat, a first bearing is embedded and fixed in the bearing seat, and the outer shaft is fixed in the inner ring of the first bearing.

[0013] In a possible implementation, the outer shaft has an externally fixed expansion sleeve, and the through-hole at the center of the film is fixedly sleeved on the cylindrical surface outside the expansion sleeve, so that the film is fixed relative to the outer shaft.

[0014] In a possible implementation, the mounting bracket fixes a bearing seat, a second bearing is nested and fixed outside the bearing seat, one end of the swing arm is a connecting ring, and the connecting ring is fixedly sleeved outside the second bearing.

[0015] In a possible implementation, a clamping groove is provided at the center of the gear disk, a shrink fit sleeve is press-fitted into the clamping groove, and the shrink fit sleeve is press-fitted outside the outer shaft, so that the gear disk is fixed relative to the outer shaft.

[0016] In a possible implementation, the device further includes a protective cover fixed to one side of the mounting bracket. The gear disk, the dial card and the first torsion spring are all located inside the protective cover, and the dial card is connected to rotate inside the protective cover. An arc-shaped relief opening is provided on one side surface of the protective cover, and the plug passes through the relief opening into the protective cover to cooperate with the dial card.

[0017] In a possible implementation, the protective cover includes a housing and a first protective plate. The housing is fixed to one side of the mounting bracket, and an assembly space is formed inside the housing. The gear disk, the dial card and the first torsion spring are all located in the assembly space. The first protective plate seals the opening of the assembly space, and the outer shaft passes through the housing into the first protective plate. After the film is connected to the outer shaft, the film is located inside the first protective plate.

[0018] In a possible implementation, the protective cover further includes a second protective plate. The second protective plate is fixed to the other end of the outer shaft relative to the first protective plate, so that the film is located between the first protective plate and the second protective plate.

[0019] In a possible implementation, the mounting bracket fixes a central shaft, and the central shaft passes through the outer shaft; a clamping portion is fixed in the middle of the second protective plate. A connecting hole adapted to the end of the central shaft is provided at the center of the clamping portion. A cutting groove is provided on one side of the clamping portion, and the cutting groove extends inward to the connecting hole. And the clamping portion is provided with a notch along its radius line, and the notch communicates with the connecting hole and the cutting groove, so that the part of the clamping portion facing away from the second protective plate after being separated by the cutting groove and the notch forms a clamping piece. When the connecting hole is sleeved on the end of the central shaft, the clamping piece moves from one side of the notch to the other side of the notch to clamp the end of the central shaft in the connecting hole.

[0020] In a possible implementation, the protective cover further includes a tapered sleeve handle. The second protective plate is provided with a threaded hole, and the tapered sleeve handle is adaptively and spirally connected to the threaded hole. The clip is provided with a moving hole on one side of the notch, and the moving hole is eccentric to the threaded hole. The tapered sleeve handle is further provided with a tapered guiding portion. When the tapered sleeve handle is screwed into the threaded hole, the guiding portion abuts against the side wall of the moving hole to drive the side of the clip where the moving hole is located to move from one side of the notch to the other side of the notch.

[0021] As can be seen from the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages: During the process of tape unwinding, when the tape is subjected to a tensile force, the swing arm swings counterclockwise, causing the plug to separate from the dial card. As a result, the dial card swings into the tooth groove of the gear disk under the torque of the second torsion spring. At the same time, the tape unwinding drives the gear disk to rotate. During the rotation of the gear disk, the guiding surface at the end of the dial card is pushed out of the tooth groove. Then, the torque of the second torsion spring drives the dial card to insert into the next tooth groove of the gear groove. Such a cycle is equivalent to forming a directional resistance when the gear disk and the outer shaft rotate during the unwinding process through the dial card, which is beneficial to reducing the rotational acceleration during unwinding and improving the stability of unwinding. When the tape unwinding ends and the tape is not subjected to an external force, at this time, the gear disk stops rotating, and at the same time, the swing arm swings into the limit groove of the plug under the action of the first torsion spring to push the end of the dial card into the tooth groove and block the dial card, making the dial card unable to swing, thereby realizing that the dial card blocks the gear disk, so that the film cannot rotate and continue to unwind. It can be seen that the structure of the present invention can realize the self-locking fixation of the outer shaft by pushing the end of the dial card into the tooth groove of the gear disk, and realize the self-locking fixation of the film fixed outside the outer shaft, avoiding the film from rotating and causing the tape to spread, and avoiding affecting the stability of pulling the tape later. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structure schematic diagram of one side view of the present invention.

[0023] Figure 2 It is a three-dimensional structure schematic diagram of the other side view of the present invention.

[0024] Figure 3 It is a three-dimensional side sectional schematic diagram of the present invention.

[0025] Figure 4 For Figure 3 The enlarged schematic diagram at B in

[0026] Figure 5 It is a three-dimensional structure schematic diagram of the fixed connection between the second protective plate and the central shaft.

[0027] Figure 6 It is a sectional schematic diagram after the tapered sleeve handle is screwed into the threaded hole of the clamping portion.

[0028] Figure 7 This is a three-dimensional structural schematic diagram after hiding the protective cover of the present invention.

[0029] Figure 8 It is Figure 7 An enlarged schematic diagram of part A in

[0030] Figure 9 This is a three-dimensional structural schematic diagram of the swing arm.

[0031] Figure 10 This is a three-dimensional structural schematic diagram of the connection between the swing arm, the bearing seat and the dial card.

[0032] Figure 11 This is a sectional structural schematic diagram of the present invention at the position of the housing.

[0033] Figure 12 It is Figure 11 A schematic diagram of the connection between the dial card, the gear disk and the plug-in in Detailed implementation manners

[0034] In order to make the purpose, technical solutions and advantages of this application clearer, the following will further describe this application in detail with reference to the accompanying drawings.

[0035] Hereinafter, terms such as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features.

[0036] In addition, in this application, orientation terms such as "upper" and "lower" are defined relative to the orientation of the components shown in the drawings. It should be understood that these directional terms are relative concepts, and they are used for relative description and clarification, and they can change accordingly with the change of the orientation where the components are placed in the drawings.

[0037] What the present invention discloses is a tape unwinding device with a self-locking function. As shown in the attached Figure 1 and 2 figures, the device includes an outer shaft 31, a gear disk 32, a dial card 35, a swing arm 33 and a protective cover 34. Among them, the sealing machine has a mounting bracket (not shown in the attached drawings) for mounting the present invention. The outer shaft 31 is connected to the mounting bracket and rotates. After the film 2 is sleeved on the outer shaft 31, the film 2 is fixed relative to the outer shaft 31, so that after the tape 21 in the film 2 is pulled out by the relevant devices of the sealing machine, the film 2 can rotate smoothly around the outer shaft 31 as the axis.

[0038] As shown in the attached Figure 3 and 4As shown, the mounting bracket fixes the bearing seat 36. A first bearing 361 is fixed inside the bearing seat 36. The outer shaft 31 is connected to the inner ring of the first bearing 361 by interference fit. Through the structure fixed by this bearing seat 36, a structure for the outer shaft 31 to rotate relative to the mounting bracket can be formed. A clamping groove 321 is provided at the center of the gear disc 32. A shrink disc 323 is press-fitted into the clamping groove 321. The shrink disc 323 is press-fitted outside the outer shaft 31 to fixedly connect the gear disc 32 and the outer shaft 31. In addition, a expansion sleeve 311 is also fixed outside the outer shaft 31. The through hole at the center of the film 2 is sleeved on the cylindrical surface outside the expansion sleeve 311 to be fixed, so that the film 2 is fixed relative to the outer shaft 31, thereby realizing the rotation of the film 2 relative to the mounting bracket, and the gear disc 32 rotates accordingly while the film 2 rotates.

[0039] The protective cover 34 is fixed to the mounting bracket through the connection of the bearing seat 36. The protective cover 34 includes a first protective plate 342 and a housing 341. Among them, an assembly space is formed inside the housing 341, and one side of the housing 341 facing away from the opening of the assembly space is fixed to the bearing seat 36, which is equivalent to fixing the housing 341 to one side of the mounting bracket. The gear disc 32, the dial 35 and the first torsion spring 351 are all located in the assembly space. The first protective plate 342 seals the assembly space, and the first protective plate 342 is fixedly connected to the housing 341. The outer shaft 31 passes through the assembly space and through the first protective plate 342, so that the film 2 can be directly fixedly connected to the expansion sleeve 311 of the outer shaft 31.

[0040] Further, as shown in the appendix Figure 5 and 6As shown, the protective cover 34 further includes a second protective plate 343, which is fixed to the other end of the outer shaft 31 opposite to the first protective plate 342, so that the film 2 is located between the first protective plate 342 and the second protective plate 343 to protect the film 2. The structure for fixing the second protective plate 343 to the other end of the outer shaft 31 can be installed through a clamping portion 344, a taper sleeve handle 346 and a central shaft 37. Specifically, the end face of one end of the central shaft 37 is fixed relative to the mounting bracket through the fixed connection of a bearing seat 36, and the other end of the central shaft 37 passes through the outer shaft 31. A clamping portion 344 is fixed in the middle of the second protective plate 343, and a connection hole 345 adapted to the end of the central shaft 37 is provided at the center of the clamping portion 344. A cutting groove 3441 is provided on one side of the clamping portion 344. The cutting groove 3441 can be formed by horizontally or obliquely cutting inward from one side of the clamping portion to form a cut extending to the connection hole 345. A notch 3442 is also provided at the position of the clamping portion 344 along its radius line. The notch 3442 communicates with the connection hole 345 and the cutting groove 3441, so that the part of the clamping portion 344 facing away from the second protective plate 343 after being separated by the cutting groove 3441 and the notch 3442 forms a clamping piece 3443. The clamping piece 3443 forms a structure that can swing elastically relative to the notch 3442. When the connection hole 345 is sleeved outside the end of the central shaft 37, the end of the central shaft 37 can be clamped in the connection hole 345 by swinging the clamping piece 3443 to one side of the notch 3442, so that the clamping portion 344 and the central shaft 37 are fixed to each other, and thus the second protective plate 343 is also fixed relative to the central shaft 37, realizing the installation and fixation of the second protective plate 343.

[0041] Continue to refer to the attached Figure 5 and 6 , a threaded hole 3444 is provided in the clamping portion 344, and the taper sleeve handle 346 is adapted to be screwed and connected with the threaded hole 3444. A moving hole 3445 is provided on one side of the clamping piece 3443 at the notch 3442, and the moving hole 3445 and the threaded hole 3444 are eccentrically arranged (i.e., the centers are not in the same position). The taper sleeve handle 346 is also provided with a guiding portion 3461 having a conical structure, and the guiding portion 3461 is fixed to one end of a stud screwed into the threaded hole 3444. When the taper sleeve handle 346 is screwed into the threaded hole 3444, the guiding portion 3461 abuts against the side wall of the moving hole 3445 to drive the side of the clamping piece 3443 provided with the moving hole 3445 to move to the other side of the notch 3442. When the taper sleeve handle 346 is screwed deeper into the threaded hole 3444, the guiding portion 3461 is embedded deeper into the moving hole 3445. Therefore, the clamping piece 3443 is driven to move to clamp the end of the central shaft 37 tighter, thereby realizing the fixation of the second protective plate 343 relative to the central shaft 37, that is, realizing the fixation of the second protective plate 343 to the other end of the outer shaft 31 opposite to the first protective plate 342.

[0042] As shown in the attached Figure 7 and 8As shown, the housing 341 fixedly mounts the mounting plate 347 in the assembly space. A first pin 3471 is fixed on the mounting plate 347. One end of the dial card 35 is sleeved outside the first pin 3471, so that the dial card 35 is connected to the mounting bracket through the protective cover 34 and the first pin 3471 and rotates, and swings relative to the gear disk 32. A first torsion spring 351 is sleeved on the other end of the first pin 3471 relative to the dial card 35, and both ends of the first torsion spring 351 are respectively inserted into the surfaces of the housing 341 and the dial card 35, thereby forming a restriction of the first torsion spring 351 on the dial card 35. Thus, the torsion of the first torsion spring 351 is used to push the dial card 35 to swing towards the gear disk 32, prompting the dial card 35 to swing and insert into the tooth groove 322 of the gear disk 32. Referring again to the appendix Figure 11 and 12 , an inclined guide surface 352 is provided at the end of the dial card 35 inserted into the tooth groove 322. When the tape 21 is pulled out to drive the film 2 and the gear disk 32 to rotate, the side surface of the tooth groove 322 pushes the guide surface 352, causing the dial card 35 to swing to drive the guide surface 352 away from the tooth groove 322. Thus, it can be seen that during unwinding, the torsion of the first torsion spring 351 drives the end of the dial card 35 to insert into the tooth groove 322 of the gear disk 32. During the process of driving the film 2 and the gear disk 32 to rotate as the tape is unwound, the rotating tooth groove 322 pushes the end of the dial card 35 out, forming a process in which the end of the dial card 35 inserts into each tooth groove 322 of the gear disk 32 and is pushed out of each tooth groove 322.

[0043] As shown in the appendix Figure 9 and 10 , one end of the swing arm 33 is a connecting ring 332. A second bearing 362 is fixed outside the bearing seat 36. The connecting ring 332 is fixedly sleeved outside the second bearing 362. Thus, a structure is formed in which the swing arm 33 rotates relative to the mounting bracket outside the protective cover 34 through the connection of the bearing seat 36 and the second bearing 362. In addition, a transmission roller 331 is provided at one end of the swing arm 33. After the tape 21 is pulled out, it bypasses the transmission roller 331, so that the tape 21 pulls the transmission roller 331 and drives the swing arm 33 to swing.

[0044] As shown in the appendix Figure 4 and 8As shown, a second torsion spring 334 is also sleeved outside the bearing seat 36 on one side of the second bearing 362. The two ends of the second torsion spring 334 are respectively inserted into the bearing seat 36 and the swing arm 33. The swing arm 33 is pushed to swing towards the card-pushing piece 35 by the torsion force of the second torsion spring 334. Specifically, when the unwinding rotation torsion formed by pulling out the tape 21 to drive the gear disk 32 to rotate is consistent with the torsion force of the second torsion spring 334, the gear disk 32 rotates at a constant speed; when the unwinding speed (i.e., rotation speed) of the gear disk 32 is slower than the speed at which the tape sealing machine pulls out the tape 21, the swing arm 33 is further pulled to swing in the direction away from the card-pushing piece 35, so that the torsion force of the second torsion spring 334 is further increased. Therefore, the torsion force exerted by the swing arm 33 on the outer shaft 31 also increases, and this torsion force causes the outer shaft 31 to accelerate and rotate until it is consistent with the speed at which the tape sealing machine pulls out the tape 21; conversely, when the unwinding speed of the gear disk 32 is faster than the speed at which the tape sealing machine pulls out the tape 21, the swing angle of the swing arm 33 becomes smaller and closer to the card-pushing piece 35, and at the same time, the torsion force of the second torsion spring 334 becomes smaller. Therefore, the torsion force exerted by the swing arm 33 on the outer shaft 31 also decreases, causing the outer shaft 31 to decelerate and rotate until it is consistent with the speed at which the tape sealing machine pulls out the tape 21. Thus, it can be seen that the structures of the swing arm 33 and the second torsion spring 334 can make the rotation speed of the outer shaft 31 consistent with the speed at which the tape sealing machine pulls out the tape 21, enabling the unwinding device of the present invention to stably output the tape.

[0045] Referring again to Attachments Figure 7 、 8 and 10, a plug-in part 333 is also provided on one side of the swing arm. An arc-shaped relief opening 348 as shown in Attachment Figure 1 is provided on one side of the protective cover 34. The plug-in part 333 passes through the relief opening 348 into the protective cover 34 and cooperates with the card-pushing piece 35. The cooperation process is as follows: when the tape 21 is not pulled out, the swing arm 33 loses the traction of the tape 21. At this time, the swing arm 21 swings until the plug-in part 333 abuts against the end of the card-pushing piece 35 far from the inserted tooth groove 322, that is, as shown in Attachment Figure 12 the plug-in part 333 moves upward to be inserted on the left side of the lower end of the card-pushing piece 35, causing the upper end of the card-pushing piece 35 to swing to maintain insertion into the tooth groove 322, thereby blocking the end of the card-pushing piece 35 far from the gear disk 32 and keeping the card-pushing piece 35 inserted into the tooth groove 322 of the gear disk 32. Further, the gear disk 32 cannot rotate, so the outer shaft 31 and the film 2 cannot rotate either, thus realizing self-locking and avoiding the tape 21 from continuing to unwind and spreading due to the inertia of previous rotation when the tape 21 stops unwinding, which is beneficial to improving the stability of unwinding.

[0046] In summary, as shown in Attachments Figure 9 and 10As shown, during the unwinding process of the tape 21, when the tape 21 is subjected to a tensile force, the swing arm 33 swings counterclockwise, separating the plug 333 from the dial 35. As a result, the dial 35 swings under the torsion of the second torsion spring 334 and inserts into the tooth groove 322 of the gear disk 32. At the same time, the unwinding of the tape 21 drives the gear disk 32 to rotate, and the gear disk 32 pushes out the guiding surface 352 at the end of the dial 35 to push the dial 35 out of the tooth groove 33. Such a cycle is equivalent to forming a directional resistance when the gear disk 32 and the outer shaft 31 rotate during the unwinding process through the dial 35, which is beneficial to reducing the rotational acceleration during unwinding and improving the unwinding stability. When the unwinding of the tape 21 ends and the tape 21 is not subjected to an external force, at this time, the gear disk 32 stops rotating. At the same time, the swing arm 33 swings under the action of the first torsion spring 351 until the plug 333 inserts into the limiting groove 353 of the dial 35, pushing the end of the dial 35 into the tooth groove 322 and blocking the dial 35, making the dial 35 unable to swing. Thus, the dial 35 is used to lock the gear disk 32, preventing the film 2 from rotating and continuing to unwind. It can be seen that the structure of the present invention can achieve the self-locking fixation of the outer shaft 31 by pushing the end of the dial 35 into the tooth groove 322 of the gear disk 32 through the plug 333, and achieve the self-locking fixation of the film 2 sleeved on the outer shaft 31, avoiding the film 2 from rotating and causing the tape 21 to unwind, and avoiding affecting the stability of pulling the tape 21 later.

[0047] The above is only the specific implementation manner of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantive modification made to the present invention using this concept shall fall within the scope of infringement of the protection scope of the present invention.

Claims

1. A tape unwinding device with a self-locking function, characterized in that, The device includes: An outer shaft rotatably connected to the mounting bracket, with the film sleeved on the outer shaft so that the film is fixed relative to the outer shaft; A gear disk fixedly connected to the outer shaft; A dial card rotatably connected to the mounting bracket, with a first torsion spring connected between the dial card and the mounting bracket. The torsion of the first torsion spring pulls the dial card to swing towards the gear disk so that the dial card swings and inserts into the tooth groove of the gear disk; An oscillating arm rotatably connected to the mounting bracket, with a transmission roller provided at one end of the oscillating arm. After the tape is pulled out, it bypasses the transmission roller, so that the tape pulls the transmission roller and drives the oscillating arm to swing away from the dial card; Wherein, a plug is also provided on one side of the oscillating arm. When the tape is not pulled out, the oscillating arm swings so that the plug abuts against the end of the dial card away from the inserted tooth groove, causing the dial card to swing and insert into the tooth groove.

2. The tape unwinding device with a self-locking function according to claim 1, characterized in that: The mounting bracket is fixedly provided with a bearing seat, a first bearing is embedded and fixed in the bearing seat, and the outer shaft is fixed in the inner ring of the first bearing.

3. The tape unwinding device with a self-locking function according to claim 1 or 2, characterized in that: A expansion sleeve is fixed outside the outer shaft, and the through hole at the center of the film is fixedly sleeved on the cylindrical surface outside the expansion sleeve, so that the film is fixed relative to the outer shaft.

4. A tape unwinding device with a self-locking function according to claim 1, characterized in that: The mounting bracket is fixedly provided with a bearing seat, a second bearing is nested and fixed outside the bearing seat, one end of the oscillating arm is a connecting ring, and the connecting ring is fixedly sleeved outside the second bearing.

5. A tape unwinding device with a self-locking function according to claim 1, characterized in that: A clamping groove is provided at the center of the gear disk, a tightening sleeve is press-fitted into the clamping groove, and the tightening sleeve is press-fitted outside the outer shaft, so that the gear disk is fixed relative to the outer shaft.

6. The tape unwinding device with a self-locking function according to claim 1 or 5, characterized in that: The device further includes a protective cover fixed to one side of the mounting bracket. The gear disk, the dial card and the first torsion spring are all located inside the protective cover, and the dial card is connected to rotate inside the protective cover. An arc-shaped relief opening is also provided on one side surface of the protective cover, and the plug passes through the relief opening into the protective cover to cooperate with the dial card.

7. The tape unwinding device with a self-locking function according to claim 6, characterized in that: The protective cover includes a cover shell and a first protective plate. The cover shell is fixed to one side of the mounting bracket, and an assembly space is formed inside the cover shell. The gear disk, the dial card and the first torsion spring are all located in the assembly space. The first protective plate seals the opening of the assembly space, and the outer shaft passes through the cover shell into the first protective plate. After the film is connected to the outer shaft, the film is located inside the first protective plate.

8. The tape unwinding device with a self-locking function according to claim 7, characterized in that: The protective cover further includes a second protective plate, and the second protective plate is fixed to the other end of the outer shaft relative to the first protective plate, so that the film is located between the first protective plate and the second protective plate.

9. The tape unwinding device with a self-locking function according to claim 8, characterized in that: The mounting bracket fixes the central shaft, and the central shaft passes through the outer shaft; a clamping portion is fixed in the middle of the second protective plate, a connection hole adapted to the end of the central shaft is provided at the center of the clamping portion, a cutting groove is provided on one side of the clamping portion, the cutting groove extends inward to the connection hole, and a notch is provided along the radial line of the clamping portion, the notch communicates with the connection hole and the cutting groove, so that the part of the clamping portion facing away from the second protective plate after being separated by the cutting groove and the notch forms a clamping piece. When the connection hole is sleeved on the end of the central shaft, the clamping piece moves from one side of the notch to the other side of the notch to clamp the end of the central shaft in the connection hole.

10. A tape unwinding device with a self-locking function according to claim 9, characterized in that: The protective cover further includes a cone sleeve handle, the second protective plate is provided with a threaded hole, the cone sleeve handle is adapted to be screwed into the threaded hole, a moving hole is provided on one side of the notch of the clamping piece, the moving hole is eccentric with the threaded hole, and the cone sleeve handle is further provided with a conical guiding portion. When the cone sleeve handle is screwed into the threaded hole, the guiding portion abuts against the side wall of the moving hole to drive the side of the clamping piece provided with the moving hole to move from one side of the notch to the other side of the notch.

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