Paper tape feeding automatic switching structure

Abstract

The utility model relates to the field of carton handle processing, in particular to a paper tape feeding automatic switching structure which comprises an unwinding structure for unwinding a paper tape and a tensioning structure for conveying and tensioning the paper tape, and the unwinding structure and the tensioning structure are matched with each other. The paper tape is arranged on the unwinding structure and conveyed to the processing line body through the tensioning structure, the tensioning structure is used for tensioning and storing part of the paper tape, when the paper tape in the unwinding structure is insufficient, the paper tape in the tensioning structure is consumed and conveyed to the processing line body, the processing line body does not need to be stopped in the process, and the effect of reducing the production cost of the line body is achieved.

Description

Technical Field

[0001] This application relates to the field of carton handle processing, and particularly to an automatic switching structure for paper tape feeding. Background Art

[0002] Currently, the paper tape is made of kraft paper which is manufactured by surface treatment of log pulp and then processed and obtained by slitting. It is mainly used as the interlayer paper for octagonal roll packaging isolation of electronic finished products and the special interlayer paper for continuous terminals. Generally, it requires precise slitting width, strong paper tensile strength, not easy to break, and uniform thickness without deformation.

[0003] When processing the paper tape, it is usually wound around a spool and then the paper tape is conveyed to the processing line body.

[0004] The above prior art solutions have the following defects: when the paper tape on the spool is insufficient, it is necessary to first pause the processing line body, then feed the processing line body, and then perform processing, which wastes operation time and increases the production cost of the line body. Utility Model Content

[0005] In order to continuously feed the processing line body without stopping the machine and achieve the effect of reducing the production cost of the line body, this application provides an automatic switching structure for paper tape feeding.

[0006] The above technical objectives of this application are achieved through the following technical solutions:

[0007] An automatic switching structure for paper tape feeding includes an unwinding structure for unwinding the paper tape and a tensioning structure for conveying and tensioning. The unwinding structure and the tensioning structure cooperate with each other. The paper tape is arranged on the unwinding structure and is conveyed to the processing line body through the tensioning structure. The tensioning structure is used to tension and store part of the paper tape. When the paper tape in the unwinding structure is insufficient, the paper tape in the tensioning structure is consumed and conveyed to the processing line body; the tensioning structure includes a support frame, a lifting component, an upper row of rollers and a lower row of rollers. The support frame is fixedly connected to the working surface. The lifting component, the upper row of rollers and the lower row of rollers are all arranged on the support frame. Both the upper row of rollers and the lower row of rollers include a plurality of rollers. The lifting component is arranged at one end of the support frame away from the working surface and is fixedly connected to the support frame. The upper row of rollers is connected to the lifting component and is slidably connected to the support frame. The lifting component can drive the upper row of rollers to move up and down along the support frame. The lower row of rollers is arranged at one end close to the working surface and is fixedly connected to the support frame. The paper tape passes through between a plurality of upper row rollers and a plurality of lower row rollers in an "S" shape alternately up and down.

[0008] By adopting the above solution, the paper tape is wound around the unwinding structure, and then one end of the paper tape is inserted into the tensioning structure, that is, the paper tape is alternately passed through the upper row of several rollers and the lower row of several rollers in an "S" shape, and then conveyed to the processing line body; because the upper row of rollers is fixedly connected to the lifting component, and the lifting component can drive the upper row of rollers to lift along the support frame, so when the paper tape on the unwinding structure is not enough to be conveyed to the processing line body, the upper row of rollers is driven to move towards the lower row of rollers. At this time, the distance between the upper row of rollers and the lower row of rollers becomes shorter, and the part of the paper tape stored between the upper row of rollers and the lower row of rollers can be conveyed to the processing line body. During this process, the end of the new paper tape is connected to the end of the paper tape that is about to be exhausted, and the replenishment of the paper tape to be processed can be completed. During this process, it is not necessary to stop the processing line body, achieving the effect of reducing the production cost of the line body.

[0009] Further, the lifting component includes a fixed pulley, a driving member, and a conveyor belt. The fixed pulley is arranged at the top end of the support frame, the driving member is arranged at the bottom end of the support frame, the fixed pulley and the driving member are vertically corresponding as a whole, and both the fixed pulley and the driving member are fixedly connected to the support frame. The conveyor belt is arranged between the fixed pulley and the driving member. One end of the conveyor belt is fixedly connected to the upper row of rollers, and the other end of the conveyor belt passes through the upper row of rollers and is wound around the driving member.

[0010] By adopting the above solution, when it is necessary to drive the upper row of rollers towards the lower row of rollers, the driving member is started. The driving member rotates to release the conveyor belt wound around the driving member. Then, the length of the conveyor belt between the driving member and the fixed pulley increases. Since the upper row of rollers is fixedly connected to the conveyor belt, as the length of the conveyor belt increases, the pulling force of the conveyor belt on the upper row of rollers decreases, and the upper row of rollers moves towards the lower row of rollers under the action of gravity; when it is necessary to move the upper row of rollers away from the lower row of rollers, the driving member is driven, and the driving member rotates to wind up the conveyor belt, so that the length of the conveyor belt between the driving member and the fixed pulley decreases. As the conveyor belt contracts, the conveyor belt drives the upper row of rollers to move away from the lower row of rollers.

[0011] Further, a blocking plate is arranged on the fixed pulley. The blocking plate is in a "U" shape, and both ends of the blocking plate are fixedly connected to both sides of the fixed pulley. The blocking plate is used to limit the conveyor belt on the fixed pulley.

[0012] By adopting the above solution, the blocking plate limits the fixed pulley and the conveyor belt to prevent the conveyor belt from falling off the fixed pulley.

[0013] Further, the unwinding structure includes an operation board, a main unwinding shaft, and a spare unwinding shaft. The operation board is vertically placed and fixedly connected to the working surface. Both the main unwinding shaft and the spare unwinding shaft are fixedly connected to the operation board. Paper tapes are wound around both the main unwinding shaft and the spare unwinding shaft. The spare unwinding shaft is used to timely supply paper tapes to the tensioning structure when the paper tapes in the main unwinding shaft are consumed completely.

[0014] By adopting the above scheme, the main unwinding shaft and the spare unwinding shaft are placed on the operation board. When the paper tapes in the unwinding shaft are about to be consumed completely, the tail end of the paper tape on the main unwinding shaft can be timely connected to the head end of the tape on the spare unwinding shaft, so as to timely connect the paper tapes on the main unwinding shaft and the spare unwinding shaft.

[0015] Further, a hot melt part is arranged between the unwinding structure and the tensioning structure. The hot melt part is arranged on the operation board and fixedly connected to the operation board. A sticking rod is arranged corresponding to the lower part of the hot melt rod. The sticking rod is fixedly connected to the operation board. The end of the paper tape on the spare unwinding shaft is bonded to the sticking rod. The paper tape on the main unwinding shaft is transmitted to the tensioning structure through the sticking rod. When the paper tape on the main unwinding shaft is insufficient, the hot melt part is used for hot melt connection of the head end of the spare unwinding shaft and the tail end of the main unwinding shaft.

[0016] By adopting the above scheme, a sticking rod is correspondingly arranged under the hot melt part. When it is necessary to connect the head end of the spare unwinding shaft and the tail end of the main unwinding shaft, the head end of the spare unwinding shaft and the tail end of the main unwinding shaft are both placed on the sticking rod, and the two are aligned. Then the hot melt part is driven, and the hot melt part performs hot melt connection on the ends of the two, so that the two can be connected together.

[0017] Further, tensioning components are arranged at both ends of the hot melt part. The tensioning components include a first tensioning rod, a second tensioning rod, and a horizontal plate. The first tensioning rod, the second tensioning rod, and the horizontal plate are all located under the hot melt part. The second tensioning part is located at one end of the sticking rod close to the tensioning structure. The horizontal plate is located at one end of the sticking rod far from the second tensioning rod. The first tensioning rod is located at one end of the horizontal plate far from the sticking rod. And the first tensioning rod, the second tensioning rod, and the horizontal plate are all fixedly connected to the operation board. The tensioning components are used to tension the paper tape passing through the area of the tensioning components.

[0018] By adopting the above scheme, the paper tape passes through the first tensioning rod, is transmitted to the horizontal plate, then passes through the hot melt component, and is then transmitted to the second tensioning rod. The first tensioning part and the second tensioning part can tension the paper tape, and the horizontal plate can support the paper tape, so that the paper tape is in a tensioned horizontal state in the tensioning components, which is convenient for the hot melt operation of the paper tape.

[0019] Further, a first pull rod and a second pull rod are also arranged on the operation panel. The first pull rod and the second pull rod are located below the main unwinding reel. The spare unwinding reel is arranged on the side of the main unwinding reel away from the tensioning structure. The first pull rod is located between the main unwinding reel and the spare unwinding reel. The second pull rod is located between the main unwinding reel and the first tensioning rod. The paper tape on the spare unwinding reel enters the tensioning assembly through the first pull rod and the second pull rod. The paper tape on the main unwinding reel enters the tensioning assembly through the second pull rod. The first pull rod and the second pull rod are used to tension the paper tape.

[0020] By adopting the above scheme, the paper tape on the spare unwinding reel enters the tensioning assembly through the first pull rod and the second pull rod. The paper tape on the main unwinding reel enters the tensioning assembly through the second pull rod. Furthermore, the paper tape can be tensioned during the running process of the paper tape, and the paper tape can be prevented from being loose and knotted.

[0021] Further, a stabilizing rod is arranged between the support frame and the working surface. Both ends of the stabilizing rod are fixedly connected to the support frame and the working surface respectively. A triangle is formed among the stabilizing rod, the support frame and the working surface. The stabilizing rod is used to increase the stability of the connection between the support frame and the working surface.

[0022] By adopting the above scheme, a triangle is formed among the stabilizing rod, the support frame and the working surface. According to the principle that a triangle has stability, the connection between the support frame and the working surface is made more stable.

[0023] In summary, the present application has the following technical effects:

[0024] 1. By setting the automatic switching structure, the paper tape is wound on the unwinding structure, and then one end of the paper tape is inserted into the tensioning structure, that is, the paper tape passes through between several upper rollers and several lower rollers in an "S" - shaped up - and - down alternating manner, and then is conveyed to the processing line body. Since the upper rollers are fixedly connected to the lifting assembly, and the lifting assembly can drive the upper rollers to lift along the support frame, when the paper tape on the unwinding structure is not enough to be conveyed to the processing line body, the upper rollers are driven to move towards the direction close to the lower rollers. At this time, the distance between the upper rollers and the lower rollers becomes shorter, and the part of the paper tape stored between the upper rollers and the lower rollers can be conveyed to the processing line body. During this process, the end of the new paper tape is connected to the tail end of the paper tape that is about to be exhausted, and thus the replenishment of the paper tape to be processed can be completed. During this process, it is not necessary to stop the processing line body, achieving the effect of reducing the production cost of the line body.

[0025] 2. By setting the spare unwinding structure, when the paper tape in the unwinding reel is about to be consumed, the tail end of the paper tape on the main unwinding reel can be timely connected to the head end of the tape on the spare unwinding reel, so as to timely connect the paper tape on the main unwinding reel with the paper tape on the spare unwinding reel.

[0026] 3. By setting up a tensioning assembly, the paper tape passes through the first tensioning rod, is conveyed to the horizontal plate, then passes through the hot-melt assembly, and is then conveyed to the second tensioning rod. The first tensioning member and the second tensioning member can tension the paper tape, and the horizontal plate can support the paper tape, so that the paper tape is in a tensioned horizontal state within the tensioning assembly, facilitating the hot-melt operation of the paper tape. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of an automatic switching structure for paper tape feeding in the present application;

[0028] Figure 2 is a schematic structural diagram of the lifting assembly in the present application;

[0029] Figure 3 is a schematic structural diagram of the sliding assembly in the present application.

[0030] In the figure, 1. Unwinding structure; 11. Operation board; 12. Main unwinding shaft; 13. Spare unwinding shaft; 2. Tensioning structure; 21. Support frame; 211. Vertical rod; 22. Upper row of rollers; 23. Lower row of rollers; 3. Lifting assembly; 31. Fixed pulley; 32. Driving member; 33. Conveyor belt; 4. Blocking plate; 5. Hot-melt member; 6. Pasting rod; 7. Tensioning assembly; 71. First tensioning rod; 72. Second tensioning rod; 73. Horizontal plate; 8. First pull rod; 9. Second pull rod; 10. Stabilizing rod; 20. Sliding assembly; 201. Limiting block; 202. Sliding rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The present application will be further described in detail below with reference to the accompanying drawings.

[0032] Refer to Figure 1 , an automatic switching structure for paper tape feeding provided in this embodiment includes an unwinding structure 1 for unwinding the paper tape and a tensioning structure 2 for conveying and tensioning. The unwinding structure 1 and the tensioning structure 2 cooperate with each other. The paper tape is arranged on the unwinding structure 1 and is finally conveyed to the processing line body via the tensioning structure 2. The tensioning structure 2 is used to tension and store the paper tape during the conveying process. When the paper tape in the unwinding structure 1 is insufficient, the paper tape stored in the tensioning structure 2 is consumed and conveyed to the processing line body, providing time for replenishing the paper tape in the unwinding structure 1, achieving the continuous input of the paper tape into the processing line body without stopping the line.

[0033] Refer to Figure 1The tensioning structure 2 includes a support frame 21, a lifting assembly 3, an upper row of rollers 22 and a lower row of rollers 23. The support frame 21 is fixedly connected to the working surface. The lifting assembly 3, the upper row of rollers 22 and the lower row of rollers 23 are all arranged on the support frame 21. The upper row of rollers 22 and the lower row of rollers 23 each include a plurality of rollers. The lifting assembly 3 is arranged at one end of the support frame 21 away from the working surface and is fixedly connected to the support frame 21. The upper row of rollers 22 are connected to the lifting assembly 3. The upper row of rollers 22 are slidably connected to the support frame 21. The lifting assembly 3 can drive the upper row of rollers 22 to rotate. Move up and down along the support frame 21, the lower row rollers 23 are arranged at one end of the support frame 21 close to the working surface, and the lower row rollers 23 are fixedly connected to the support frame 21, and the paper tape passes between the upper row rollers and the lower row rollers alternately up and down in an "S" shape; when the paper tape on the unwinding structure 1 is not enough to be transmitted to the processing line, the upper row rollers 22 are driven to move toward the direction close to the lower row rollers 23. At this time, the distance between the upper row rollers 22 and the lower row rollers 23 becomes shorter, and part of the paper tape stored between the upper row rollers 22 and the lower row rollers 23 can be transmitted to the processing line.

[0034] Reference Figure 1 and Figure 3 The upper roller 22 and the lower roller 23 each include a cross bar and a plurality of rollers, the plurality of rollers are arranged in a linear manner, and the plurality of rollers are arranged in a coaxial state with the cross bar as a whole; vertical rods 211 perpendicular to the cross bar are provided on both sides of the support frame 21, and the two ends of each vertical rod 211 are respectively fixedly connected to the top wall and the bottom wall of the support frame 21; the lower roller 23 is arranged on the side close to the bottom wall of the support frame 21, and the two ends of the cross bar of the lower roller 23 are respectively fixedly connected to the two vertical rods 211, and the upper roller 22 is arranged above the lower roller 23; the two ends of the cross bar of the upper roller 22 are respectively fixedly connected to the two vertical rods 211, and the upper roller 22 is arranged above the lower roller 23; the two ends of the cross bar of the upper roller 22 are respectively fixedly connected to the two The vertical rods 211 are slidably connected, and each vertical rod 211 is provided with a slide groove. Sliding components 20 are arranged at both ends of the cross rod of the upper row roller 22. The sliding component 20 is arranged on the side of the support frame 21 away from the upper row roller 22. Each sliding component 20 includes a limit block 201 and a sliding rod 202. One end of the sliding rod 202 is fixedly connected to the side wall of the limit block 201, and the end of the sliding rod 202 away from the limit block 201 passes through the slide groove and is fixedly connected to the upper row roller 22. Through the above arrangement, the sliding rod 202 slides up and down along the slide groove, thereby driving the upper row roller 22 to slide up and down along the slide groove.

[0035] Reference Figure 1 and Figure 2, the lifting assembly 3 includes a fixed pulley 31, a driving member 32, and a conveyor belt 33. The fixed pulley 31 is provided at the top end of the support frame 21, and the driving member 32 is provided at the bottom end of the support frame 21. The fixed pulley 31 and the driving member 32 are vertically corresponding as a whole. Both the fixed pulley 31 and the driving member 32 are fixedly connected to the support frame 21. The conveyor belt 33 is arranged between the fixed pulley 31 and the driving member 32. One end of the conveyor belt 33 is fixedly connected to the cross bar of the upper row of rollers 22. The other end of the conveyor belt 33 passes through the through hole opened on the cross bar of the upper row of rollers 22 and then winds around the driving member 32. In this embodiment, the driving member 32 is preferably a winch. A blocking plate 4 is provided on the fixed pulley 31. The blocking plate 4 is in a "U" shape, and both ends of the blocking plate 4 are fixedly connected to both sides of the fixed pulley 31. The blocking plate 4 is used to limit the conveyor belt 33 on the fixed pulley 31. When it is necessary to drive the upper row of rollers 22 in the direction close to the lower row of rollers 23, the driving member 32 is started. The driving member 32 rotates to release the conveyor belt 33 wound around the driving member 32. Furthermore, the length of the conveyor belt 33 between the driving member 32 and the fixed pulley 31 increases. Since the upper row of rollers 22 is fixedly connected to the conveyor belt, as the length of the conveyor belt increases, the pulling force of the conveyor belt 33 on the upper row of rollers 22 decreases, and then the upper row of rollers 22 moves in the direction close to the lower row of rollers 23 under the action of gravity.

[0036] Refer to Figure 1 , the unwinding structure 1 includes an operation board 11, a main unwinding shaft 12, and a spare unwinding shaft 13. The operation board 11 is vertically placed and fixedly connected to the working surface. Both the main unwinding shaft 12 and the spare unwinding shaft 13 are fixedly connected to the operation board 11. Paper tapes are wound on both the main unwinding shaft 12 and the spare unwinding shaft 13. The spare unwinding shaft 13 is used to timely supply the paper tape to the tensioning structure 2 when the paper tape in the main unwinding shaft 12 is consumed.

[0037] Refer to Figure 1 , a hot melt part 5 is arranged between the unwinding structure 1 and the tensioning structure 2. The hot melt part 5 is arranged on the operation board 11 and fixedly connected to the operation board 11. A pasting rod 6 is arranged below the corresponding hot melt rod. The end of the paper tape on the spare unwinding shaft 13 is adhered to the pasting rod 6. The paper tape on the main unwinding shaft 12 is transmitted to the tensioning structure 2 through the pasting rod 6. When the paper tape on the main unwinding shaft 12 is insufficient, the hot melt part 5 is used for hot melt connection between the head end of the spare unwinding shaft 13 and the tail end of the main unwinding shaft 12.

[0038] Refer to Figure 1, tensioning components 7 are provided at both ends of the heat fusion part 5. The tensioning components 7 include a first tensioning rod 71, a second tensioning rod 72 and a horizontal plate 73. The first tensioning rod 71, the second tensioning rod 72 and the horizontal plate 73 are all located below the heat fusion part 5. The second tensioning part is located at one end of the pasting rod 6 close to the tensioning component 7, the horizontal plate 73 is located at one end of the pasting rod 6 far from the second tensioning rod 72, and the first tensioning rod 71 is located at one end of the horizontal plate 73 far from the pasting rod 6. Moreover, the first tensioning rod 71, the second tensioning rod 72 and the horizontal plate 73 are all fixedly connected to the operation plate 11. The tensioning component 7 is used to tension the paper tape passing through the area of the tensioning component 7, which is convenient for connecting the tail end of the main winding shaft 12 and the head end of the spare winding shaft 13.

[0039] Refer to Figure 1 , a first pull rod 8 and a second pull rod 9 are further provided on the operation plate 11. The first pull rod 8 and the second pull rod 9 are both located below the main winding shaft 12. The spare winding shaft 13 is on the side of the main winding shaft 12 far from the tensioning structure 2. The first pull rod 8 is located between the main winding shaft 12 and the spare winding shaft 13, and the second pull rod 9 is located between the main winding shaft 12 and the first tensioning rod 71. The paper tape on the spare winding shaft 13 enters the tensioning component 7 through the first pull rod 8 and the second pull rod 9, and the paper tape on the main winding shaft 12 enters the tensioning component 7 through the second pull rod 9. The first pull rod 8 and the second pull rod 9 are used to tension the paper tape, which can prevent the paper tape from sagging and knotting during the transmission process.

[0040] Refer to Figure 1 , a stabilizing rod 10 is provided between the support frame 21 and the working surface. Both ends of the stabilizing rod 10 are fixedly connected to the support frame 21 and the base plate respectively. A triangle is formed among the stabilizing rod 10, the support frame 21 and the base plate. The stabilizing rod 10 is used to increase the stability of the connection between the support frame 21 and the working surface.

[0041] The implementation principle of an automatic paper tape feeding and switching structure in an embodiment of the present application is as follows: The paper tape is wound around the main winding shaft 12 and is input into the processing line body through the tensioning component 7 and the tensioning structure 2; when the paper tape on the main winding shaft 12 is not enough to be transmitted into the processing line body, the upper row of rollers 22 is driven to move towards the direction close to the lower row of rollers 23. At this time, the distance between the upper row of rollers 22 and the lower row of rollers 23 becomes shorter, and a part of the paper tape stored between the upper row of rollers 22 and the lower row of rollers 23 can be transmitted into the processing line body. During this process, the end of the paper tape on the spare winding shaft 13 is aligned with the tail end of the paper tape that is about to be exhausted, and both are placed on the pasting rod 6. The heat fusion part 5 is driven, and the head of the heat fusion part 5 moves towards the direction close to the pasting rod 6. The heat fusion part 5 heat-fuses the end of the paper tape on the spare winding shaft 13 and the tail end of the paper tape that is about to be exhausted together. Through the above, the replenishment of the paper tape to be processed can be completed. During this process, it is not necessary to stop the processing line body, achieving the effect of reducing the production cost of the line body.

[0042] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment that do not contribute creatively as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. An automatic switching structure for paper tape feeding, characterized in that: It includes an unwinding structure (1) for unwinding the paper tape and a tensioning structure (2) for conveying and tensioning. The unwinding structure (1) and the tensioning structure (2) cooperate with each other. The paper tape is arranged on the unwinding structure (1) and is conveyed to the processing line body via the tensioning structure (2). The tensioning structure (2) is used to tension and store part of the paper tape. When the paper tape in the unwinding structure (1) is insufficient, the paper tape in the tensioning structure (2) is consumed and conveyed to the processing line body; The tensioning structure (2) includes a support frame (21), a lifting component (3), an upper row of rollers (22) and a lower row of rollers (23). The support frame (21) is fixedly connected to the working surface. The lifting component (3), the upper row of rollers (22) and the lower row of rollers (23) are all arranged on the support frame (21). Both the upper row of rollers (22) and the lower row of rollers (23) include a number of rollers. The lifting component (3) is arranged at one end of the support frame (21) away from the working surface and is fixedly connected to the support frame (21). The upper row of rollers (22) is connected to the lifting component (3) and is slidably connected to the support frame (21). The lifting component (3) can drive the upper row of rollers (22) to move up and down along the support frame (21). The lower row of rollers (23) is arranged at one end of the support frame (21) close to the working surface and is fixedly connected to the support frame (21). The paper tape passes through the upper row of several rollers and the lower row of several rollers alternately in an "S" shape.

2. The automatic switching structure for paper tape feeding according to claim 1, wherein: The lifting component (3) includes a fixed pulley (31), a driving member (32) and a conveyor belt (33). The fixed pulley (31) is arranged at the top of the support frame (21). The driving member (32) is arranged at the bottom of the support frame (21). The fixed pulley (31) and the driving member (32) are vertically corresponding as a whole. Both the fixed pulley (31) and the driving member (32) are fixedly connected to the support frame (21). The conveyor belt (33) is arranged between the fixed pulley (31) and the driving member (32). One end of the conveyor belt (33) is fixedly connected to the upper row of rollers (22), and the other end of the conveyor belt (33) passes through the upper row of rollers (22) and is wound around the driving member (32).

3. The automatic switching structure for paper tape feeding according to claim 2, wherein: A blocking plate (4) is arranged on the fixed pulley (31). The blocking plate (4) is in a "U" shape. Both ends of the blocking plate (4) are fixedly connected to both sides of the fixed pulley (31). The blocking plate (4) is used to limit the conveyor belt (33) on the fixed pulley (31).

4. The automatic switching structure for paper tape feeding according to claim 1, wherein: The unwinding structure (1) includes an operation board (11), a main unwinding shaft (12) and a spare unwinding shaft (13). The operation board (11) is placed vertically and is fixedly connected to the working surface. Both the main unwinding shaft (12) and the spare unwinding shaft (13) are fixedly connected to the operation board (11). Paper tapes are wound on both the main unwinding shaft (12) and the spare unwinding shaft (13). The spare unwinding shaft (13) is used to replenish the paper tape in the tensioning structure (2) in time when the paper tape in the main unwinding shaft (12) is consumed completely.

5. The automatic switching structure for paper tape feeding according to claim 4, characterized in that: A hot melt part (5) is arranged between the unwinding structure (1) and the tensioning structure (2). The hot melt part (5) is arranged on the operation board (11), and the hot melt part (5) is fixedly connected to the operation board (11). A pasting rod (6) is arranged corresponding to the lower part of the hot melt rod. The pasting rod (6) is fixedly connected to the operation board (11). The end of the paper tape on the spare unwinding shaft (13) is adhered to the pasting rod (6). The paper tape on the main unwinding shaft (12) is transmitted to the tensioning structure (2) through the pasting rod (6). When the paper tape on the main unwinding shaft (12) is insufficient, the hot melt part (5) is used for hot melt connection between the head of the spare unwinding shaft (13) and the tail of the main unwinding shaft (12).

6. The automatic switching structure for paper tape feeding according to claim 5, characterized in that: Tightening components (7) are arranged at both ends of the hot melt part (5). The tightening components (7) include a first tightening rod (71), a second tightening rod (72) and a horizontal plate (73). The first tightening rod (71), the second tightening rod (72) and the horizontal plate (73) are all located below the hot melt part (5). The second tightening part is located at one end of the pasting rod (6) close to the tensioning structure (2). The horizontal plate (73) is located at one end of the pasting rod (6) far from the second tightening rod (72). The first tightening rod (71) is located at one end of the horizontal plate (73) far from the pasting rod (6). And the first tightening rod (71), the second tightening rod (72) and the horizontal plate (73) are all fixedly connected to the operation board (11). The tightening components (7) are used for tightening the paper tape passing through the area of the tightening components (7).

7. An automatic switching structure for paper tape feeding according to claim 6, characterized in that: A first pull rod (8) and a second pull rod (9) are further arranged on the operation board (11). The first pull rod (8) and the second pull rod (9) are located below the main unwinding shaft (12). The spare unwinding shaft (13) is placed on one side of the main unwinding shaft (12) far from the tensioning structure (2). The first pull rod (8) is located between the main unwinding shaft (12) and the spare unwinding shaft (13). The second pull rod (9) is located between the main unwinding shaft (12) and the first tightening rod (71). The paper tape on the spare unwinding shaft (13) enters the tightening components (7) through the first pull rod (8) and the second pull rod (9). The paper tape on the main unwinding shaft (12) enters the tightening components (7) through the second pull rod (9). Both the first pull rod (8) and the second pull rod (9) are used for tensioning the paper tape.

8. The automatic switching structure for paper tape feeding according to claim 1, characterized in that: A stabilizing rod (10) is arranged between the support frame (21) and the working surface. Both ends of the stabilizing rod (10) are fixedly connected to the support frame (21) and the working surface respectively. A triangle is formed among the stabilizing rod (10), the support frame (21) and the working surface. The stabilizing rod (10) is used for increasing the stability of the connection between the support frame (21) and the working surface.

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