Unwinding assembly of back sealing bag making machine

Abstract

The utility model discloses an unwinding assembly of a back sealing bag making machine, which belongs to the technical field of back sealing bag making machines and comprises a bearing seat, a bearing rod fixing pipe and a coiled material unit. Each coiled material unit comprises a sleeve piece and a fixing piece; according to the device, through cooperation of the sleeve pieces, the fixing pipe and the fixing piece, after the coiled material on one sleeve piece is unwound, limitation on the sleeve piece can be relieved through the fixing piece, so that the anti-winding sleeve piece can be rapidly separated from the unwinding position, and the other sleeve piece wound with the coiled material can be positioned to the unwinding position; compared with the prior art in which the unwinding drum needs to be disassembled and assembled, the method has the advantages that the steps are fewer, less time can be spent on replacing the coiled material, the downtime of a production line can be shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of back-sealing bag making machines, and in particular relates to an unwinding component of a back-sealing bag making machine. Background Art

[0002] Back-seal bag making machine is a kind of equipment used to produce various types of back-seal bags. These bags are usually used to package various products such as food, cosmetics, medicines, daily necessities, etc. The main work of the back-seal bag making machine is to convert the roll material (such as plastic film) into a back-seal bag through a series of processing steps, and then cut, seal and form it; the unwinding component is a part of the back-seal bag making machine, which is used to transport the rolled raw material (such as plastic film) to the working area of ​​the bag making machine.

[0003] CN220115778U discloses a reeling device for a PE bag making machine, comprising a support seat, a slanted plate fixedly connected to the left side of the support seat, a reeling drum arranged above the slanted plate, a motor fixedly connected to the front side of the support seat, a connecting roller arranged inside the support seat, a second fixed shaft arranged on the left side of the connecting roller, an arc groove opened on the front and back sides of the support seat, and a connecting shaft arranged at the center of the reeling drum; the reeling device has the following problems:

[0004] Among them, the unwinding drum is used for winding the coiled material. When the coiled material is used up, the entire unwinding drum needs to be removed from the support seat and then replaced with another unwinding drum with the coiled material wound around it. Such replacement steps are cumbersome, which will increase the downtime of the production line and thus reduce production efficiency. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a reel-unwinding assembly for a back-sealing bag-making machine to solve the technical problem of complicated steps for replacing the reel-unwinding drum proposed in the background art.

[0006] In order to achieve the above object, the utility model provides the following technical solutions:

[0007] The utility model provides a reeling assembly for a back-sealing bag making machine, comprising a load-bearing seat, a load-bearing rod fixing tube and a coil unit; one end of the load-bearing rod is rotatably connected to the load-bearing seat; the other end of the load-bearing rod is away from the load-bearing seat; the load-bearing rod is horizontally arranged; the fixing tube is fixedly sleeved on the load-bearing rod; the coil unit is evenly arranged on the fixing tube; the coil unit comprises a kit and a fixing piece; the kit is slidably sleeved on the fixing tube; the kit is used for winding the coil; the fixing piece is used for limiting the sliding of the kit on the fixing tube.

[0008] Furthermore, at least one fixing groove is opened on the circumferential side of the fixing tube; the fixing groove is arranged along the axial direction of the fixing tube; the fixing groove runs through both ends of the fixing tube; the kit includes two half rings; the two half rings are symmetrically spliced ​​with the axis of the fixing tube as the center, and are coaxial with the fixing tube after splicing; the side walls of the two half rings are respectively provided with a limit block; the two limit blocks are spliced ​​and slidably connected to the fixing groove together; the fixing piece is used to limit the two limit blocks from sliding in the fixing groove.

[0009] Furthermore, the fixing member includes two fixing blocks; the two fixing blocks are respectively connected to the same end of the corresponding limiting blocks; one of the fixing blocks is provided with a slot; and the other fixing block is clipped into the slot.

[0010] Furthermore, the card slot is provided with a tightening groove which penetrates to the corresponding fixed block; the fixed block located in the card slot is provided with a tightening hole which is coaxial with and connected to the tightening groove; a tightening piece which is threadedly connected to the tightening hole and is slidably connected in the tightening groove; one end of the tightening piece is tightened against the fixed slot.

[0011] Furthermore, there is a gap between one end of the fixing tube close to the load-bearing seat and the side wall of the load-bearing seat; the distance of the gap is greater than the axial distance of the semi-ring.

[0012] Furthermore, a protruding plate is connected to the load-bearing seat; the protruding plate is arranged horizontally and is located directly below the fixed pipe.

[0013] Furthermore, an anti-wrinkle unit is provided on the protruding plate; the anti-wrinkle unit includes an anti-wrinkle frame, an anti-wrinkle roller and an anti-wrinkle component; both ends of the anti-wrinkle roller are rotatably connected to the anti-wrinkle frame; the anti-wrinkle roller is parallel to the fixed tube; the anti-wrinkle component is used to drive the anti-wrinkle frame to move so that the anti-wrinkle roller contacts the roll material.

[0014] Furthermore, a telescopic member is connected to the extended plate; the telescopic member is arranged vertically; the telescopic end of the telescopic member is connected to a supporting arc ring; the supporting arc ring is coaxial with the fixed tube; the telescopic member is used to drive the supporting arc ring to move so that the supporting arc ring supports the fixed tube.

[0015] The beneficial effects of the utility model are:

[0016] In the present application, through the cooperation of the kit, the fixing tube and the fixing part, after the unwinding of the coil on one kit is completed, the restriction on the kit can be released by the fixing part, so that the kit after anti-rolling can quickly leave the unwinding position, and the other kit wrapped with the coil can be positioned to the unwinding position. In this way, the kit can be switched only by sliding. Compared with the method in the prior art that requires disassembly and installation of the unwinding drum, there are fewer steps and less time can be spent on changing the coil, which can reduce the downtime of the production line and improve production efficiency.

[0017] Other advantages, objectives and features of the utility model will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the utility model. The objectives and other advantages of the utility model can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model is described with the following drawings:

[0019] Figure 1 It is a three-dimensional diagram of the utility model;

[0020] Figure 2 It is a three-dimensional diagram of the conveying roller of the utility model;

[0021] Figure 3 A three-dimensional diagram of a coil unit of the utility model;

[0022] Figure 4 A three-dimensional diagram of the utility model kit;

[0023] Figure 5 A three-dimensional diagram of the utility model kit disassembled;

[0024] Figure 6 It is a three-dimensional diagram of the structure on the extended plate of the utility model.

[0025] The markings in the accompanying drawings are as follows: load-bearing seat 1, load-bearing rod 2, fixed tube 3, load-bearing block 4, load-bearing column 5, frame 6, conveying roller 7, rotating shaft 8, servo motor 9, fixing groove 10, half ring 11, limit block 12, fixing block 13, card slot 14, tightening groove 15, tightening hole 16, tightening member 17, extending plate 18, anti-wrinkle frame 19, anti-wrinkle roller 20, anti-wrinkle tube 21, anti-wrinkle rod 22, reinforcing rod 23, telescopic member 24, supporting arc ring 25. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0027] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to those skilled in the art that these specific details are not necessary to implement the present invention. In other examples, in order to avoid obscuring the present invention, well-known structures, circuits, materials or methods are not specifically described.

[0028] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the scope of protection of the present invention.

[0030] Embodiment 1: Figures 1 to 6 As shown, the utility model provides a reeling assembly of a back-sealing bag making machine, comprising a load-bearing seat 1, a load-bearing rod 2, a fixed tube 3 and a coil unit; the load-bearing seat 1 is used to support the entire reeling assembly; one end of the load-bearing rod 2 is rotatably connected to the load-bearing seat 1; the other end of the load-bearing rod 2 is away from the load-bearing seat 1; the load-bearing rod 2 is horizontally arranged; the fixed tube 3 is fixedly sleeved on the load-bearing rod 2; the coil unit is evenly arranged on the fixed tube 3, that is, the number of coil units is multiple, and this embodiment is described by taking three as an example; the coil unit comprises a kit and a fixing part; the kit is slidably sleeved on the fixed tube 3; the kit is used to wind the coil; the fixing part is used to limit the sliding of the kit on the fixed tube 3.

[0031] Specifically, the load-bearing seat 1 includes a base and a load-bearing block 4; since one end of the load-bearing rod 2 is only connected to the load-bearing seat 1 and the other end is exposed, the load-bearing rod 2 may cause the entire unwinding assembly to tip over; in order to avoid this situation, it is necessary to ensure that the total weight of the load-bearing block 4, the load-bearing rod 2, the fixed tube 3 and the coil unit is half the weight of the base, so as to ensure that the unwinding assembly can be placed stably.

[0032] Specifically, a horizontal load-bearing hole is opened on the load-bearing block 4; a load-bearing column 5 is coaxially rotatably connected in the load-bearing hole; one end of the load-bearing rod 2 is coaxially fixedly connected to one end of the load-bearing column 5; the diameter of the load-bearing column 5 is 3 times the diameter of the load-bearing rod 2, which can provide greater load-bearing capacity and bending strength, thereby ensuring that the load-bearing rod 2 can be stably supported.

[0033] Specifically, the load-bearing seat 1 is fixedly connected to a U-shaped frame 6; the relative vertical side walls of the frame 6 are provided with horizontally arranged rotating holes; a horizontal conveying roller 7 is arranged in the frame 6; the two ends of the conveying roller 7 are coaxially rotatably connected in the rotating hole through a rotating shaft 8; the vertical outer side wall of the frame 6 is fixedly connected to a servo motor 9 arranged away from the load-bearing seat 1; the power end of the servo motor 9 rotates and extends into the rotating hole and is coaxially connected to one end of the rotating shaft 8; the servo motor 9 can drive the rotating shaft 8 to rotate, thereby driving the conveying roller 7 to rotate.

[0034] The principle and beneficial effects of the above technical solution:

[0035] Before unwinding, the coil is wound on the corresponding set, and then the set wrapped with the coil is slidably mounted on the fixed tube 3 from the end away from the load-bearing seat 1, and the position of the set is limited by the fixing part. A set close to the load-bearing seat 1 is moved to the unwinding position, and the set is fixed by the fixing part to limit the movement of the set.

[0036] When unwinding, the servo motor 9 drives the conveying roller 7 to rotate, so that the coil passes through the conveying roller 7 and is sent to the next process step for processing, such as folding the coil using a crease wheel.

[0037] When replacing the kit, stop the rotation of the servo motor 9, then release the restriction on the kit through the fixing part, and then push the unwinding kit to move to other positions of the fixed tube 3, then release the restriction on the kit wrapped with the coiled material, so that the kit wrapped with the coiled material is moved to the unwinding position, and then repeat the above steps to unwind.

[0038] In the present application, through the cooperation of the kit, the fixing tube 3 and the fixing part, after the unwinding of the coil on one kit is completed, the restriction on the kit can be released by the fixing part, so that the kit after anti-rolling can quickly leave the unwinding position, and the other kit wrapped with the coil can be positioned to the unwinding position. In this way, the kit can be switched only by sliding. Compared with the method of the prior art that requires disassembly and installation of the unwinding drum, there are fewer steps and less time can be spent on changing the coil, which can reduce the downtime of the production line and improve production efficiency.

[0039] At the same time, when all the kits on the fixed tube 3 are unwound, the restriction on the kit is released by the fixing part, and then the kit closest to the load-bearing seat 1 is pushed to slide in the direction away from the load-bearing seat. During the sliding process, the kit can push other kits to move, so that all the unwound kits can be removed together, the operation efficiency is high, and the downtime of the production line can be shortened.

[0040] Embodiment 2: This embodiment is based on embodiment 1. Figure 3 , 4 As shown, at least one fixing groove 10 is opened on the circumferential side of the fixing tube 3; the fixing groove 10 is arranged along the axial direction of the fixing tube 3; the fixing groove 10 runs through both ends of the fixing tube 3; the kit includes two half rings 11; the two half rings 11 are symmetrically spliced ​​with the axis of the fixing tube 3 as the center, and are coaxial with the fixing tube 3 after splicing; the side walls of the two half rings 11 are each integrally formed with a limiting block 12; the two limiting blocks 12 are spliced ​​and slidably connected to the fixing groove 10 together; the fixing piece is used to limit the two limiting blocks 12 from sliding in the fixing groove 10; the limiting block 12 is slidably connected to the fixing groove 10 along the axial direction of the fixing tube 3.

[0041] Specifically, there are two fixing grooves 10; the inner wall of each half ring 11 is connected to two limit blocks 12; after the two half rings 11 are spliced ​​together; the limit blocks 12 on the two half rings 11 are respectively spliced ​​together, and the two limit blocks 12 after splicing are slidably connected to the corresponding fixing grooves 10; by opening two fixing grooves 10, the two half rings 11 can be slidably connected in the fixing grooves 10 through their respective two limit blocks 12, which can improve the stability of the two half rings 11 after splicing, and ensure that the half rings 11 are stably mounted on the fixing tube 3 through the limit blocks 12; the diameter of the load-bearing rod is smaller than the fixing tube 3.

[0042] The principle and beneficial effects of the above technical solution:

[0043] Through the above-mentioned unwinding method, after the unwinding is completed, the restriction on the kit is released by the fixing part, and then the kit is moved so that the kit can leave the fixed tube 3. When the kit leaves the fixed tube 3, the limit block 12 leaves the fixed groove 10, and the two half rings 11 can be naturally separated. Then, the two separated half rings 11 are re-spliced ​​and the coil is wound on the two spliced ​​half rings 11. Then, the kit wrapped with the coil can be re-sleeved on the fixed tube 3 from the end of the fixed tube 3 away from the load-bearing seat 1.

[0044] After unwinding, the two half rings 11 can separate naturally after leaving the fixed groove 10, and then the set wrapped with the coiled material can be re-mounted on the fixed tube 3 from the end of the fixed tube 3 away from the load-bearing seat 1. In this way, the operations of disassembling the set and mounting the set with the coiled material on the fixed tube 3 will not interfere with each other. The two operations can be carried out simultaneously without interfering with each other, thereby greatly shortening the time for changing rolls and improving production efficiency.

[0045] In this embodiment, Figure 4 , 5 As shown, the fixing member includes two fixing blocks 13; there are two fixing members, which are respectively located in the same fixing groove 10; in each fixing member, the two fixing blocks 13 are respectively fixedly connected to the same end of the corresponding limit block 12; one of the fixing blocks 13 is provided with a slot 14, which passes through both ends of the fixing block 13 along the axial direction of the fixing tube 3, so that the fixing block 13 is in a U-shaped structure; the other fixing block 13 is snapped into the slot 14.

[0046] The principle and beneficial effects of the above technical solution:

[0047] Through the design of the card slot 14 and the fixing block 13, the fixing block 13 can be easily inserted into the card slot 14, so that the two half rings 11 can be accurately and quickly spliced ​​together. After the two half rings 11 are spliced ​​together, the corresponding two limit blocks 12 can be aligned, so that the aligned two limit blocks 12 can quickly slide into the corresponding fixing grooves 10, so that the kit can be quickly put on the fixing tube 3.

[0048] In this embodiment, Figure 4 , 5 As shown, in one of the fixing grooves 10, each card slot 14 is provided with a tightening groove 15 which penetrates to the corresponding fixing block 13; the fixing block 13 located in the card slot 14 is provided with a tightening hole 16 which is coaxial with and connected to the corresponding tightening groove 15; a tightening member 17 which is threadedly connected to the tightening hole 16 is slidably connected in the tightening groove 15; one end of the tightening member 17 is tightened against the fixing groove 10; the tightening groove 15 and the tightening hole 16 are both provided along the radial direction of the fixing tube 3; the tightening member 17 is a screw which is threadedly connected to the corresponding tightening hole 16, and one end of the screw is tightened against the corresponding fixing groove 10.

[0049] The principle and beneficial effects of the above technical solution:

[0050] After unwinding is completed through the above steps, loosen and remove the clamping piece 17 so that the clamping piece 17 is released from the clamping with the fixing groove 10, so that the sliding set can be located on the load-bearing rod 2. Since the clamping piece 17 is removed and the limit block 12 leaves the fixing groove 10, the two half rings 11 are released from splicing and can be removed. Thereafter, the two half rings 11 are re-spliced ​​and the clamping thread is connected in the clamping hole 16, so that the splicing state of the two half rings 11 can be maintained, which facilitates the winding of the coil on the set, thereby making full use of the set, and the set wrapped with the coil is again put on the fixed tube 3 through the above method.

[0051] In this embodiment, Figure 1 , 3 As shown, there is a gap between the end of the fixing tube 3 close to the load-bearing seat 1 and the side wall of the load-bearing seat 1 ; the distance of the gap is greater than the axial distance of the half ring 11 .

[0052] The principle and beneficial effects of the above technical solution:

[0053] In this way, when the coil on one set is unwound and the set is allowed to leave the fixing tube 3 and slide onto the load-bearing rod 2, the setting of the gap ensures that there is enough space to facilitate the disassembly of the two spliced ​​half rings 11.

[0054] Embodiment 3: In this embodiment, based on Embodiment 1 or 2, a protruding plate 18 is connected to the load-bearing seat 1; the protruding plate 18 is arranged horizontally and is located directly below the fixed pipe 3; specifically, one end of the protruding plate 18 is fixedly connected to the vertical side wall of the base.

[0055] In this embodiment, Figure 6 As shown, an anti-wrinkle unit is provided on the extended plate 18; the anti-wrinkle unit includes an anti-wrinkle frame 19, an anti-wrinkle roller 20 and an anti-wrinkle member; both ends of the anti-wrinkle roller 20 are rotatably connected to the anti-wrinkle frame 19; the anti-wrinkle roller 20 is parallel to the fixed tube 3; the anti-wrinkle member is used to drive the anti-wrinkle frame 19 to move so that the anti-wrinkle roller 20 contacts the coil;

[0056] Specifically, the anti-wrinkle frame 19 is a U-shaped frame structure, and horizontally arranged connection holes are opened on the relative vertical side walls of the anti-wrinkle frame 19; the two ends of the anti-wrinkle roller 20 are coaxially fixedly connected with a connection shaft; the anti-wrinkle roller 20 is rotatably connected to the corresponding connection hole through the connection shaft; during the unwinding process, when the anti-wrinkle roller 20 can contact the coil, the unwinding is carried out as the fixed tube 3 rotates, and the coil leaves the kit and enters the next process through the conveying roller 7; during the unwinding process, the anti-wrinkle roller 20 can contact the coil, thereby preventing the coil from wrinkling;

[0057] Specifically, the anti-wrinkle member includes an anti-wrinkle tube 21 vertically fixedly connected to the extension plate 18; an anti-wrinkle rod 22 is slidably connected inside the anti-wrinkle tube 21; the top end of the anti-wrinkle rod 22 extends out of the anti-wrinkle tube 21 and is fixedly connected to the bottom side of the anti-wrinkle frame 19; a spring damper (not shown in the figure) is connected between the bottom end of the anti-wrinkle rod 22 and the extension plate 18; the spring damper can push the anti-wrinkle rod 22 upward, so that during the unwinding process, the anti-wrinkle roller 20 can maintain contact with the coil to prevent the coil from wrinkling;

[0058] Specifically, there are several reinforcing rods 23 in a circular array around the load-bearing rod 2; one end of each reinforcing rod 23 is fixedly connected to the load-bearing column 5, and the other end of each reinforcing rod 23 is connected to the circumference of the load-bearing rod 2; by providing multiple reinforcing rods 23, the connection strength between the load-bearing rod 2 and the load-bearing column 5 can be increased, and the force strength of the load-bearing rod 2 can be improved, so as to avoid the load-bearing rod 2 being broken when the kit wrapped with the coiled material is put on the fixed tube 3.

[0059] The principle and beneficial effects of the above technical solution:

[0060] After the kit is positioned to the unwinding position by the above method, the anti-wrinkle rod 22 moves upward under the action of the spring damper, thereby driving the anti-wrinkle frame 19 to move, and then the anti-wrinkle roller 20 is in contact with the coil being unwound on the kit, so that during the unwinding process, the anti-wrinkle roller 20 can maintain contact with the coil to avoid wrinkling of the coil; at the same time, when unwinding, the coil will drive the anti-wrinkle roller 20 to rotate around the axis of the connecting shaft. This contact mode is rotational contact, which reduces the friction resistance of the coil and does not reduce the unwinding efficiency.

[0061] In this embodiment, Figure 6 As shown, a telescopic member 24 is connected to the extended plate 18; the telescopic member 24 is arranged vertically; the telescopic end of the telescopic member 24 is connected to a support arc ring 25; the support arc ring 25 is coaxial with the fixed tube 3; the telescopic member 24 is used to drive the support arc ring 25 to move, so that the support arc ring 25 supports the fixed tube 3.

[0062] Specifically, the telescopic member 24 is an electric telescopic rod; the supporting arc ring 25 is an arc-shaped structure; and the fixed tube 3 is in rotational contact with the arc inner wall of the supporting arc ring 25 .

[0063] The principle and beneficial effects of the above technical solution:

[0064] After the kit wrapped with the coiled material is moved to the predetermined position by the above method, the kit is restricted from further movement by the fixing part, and then the supporting arc ring 25 is driven to move upward by the telescopic part 24, so that the supporting arc ring 25 is supported on the peripheral side of the fixed tube 3 through the inner wall of the arc. This can reduce the load on the load-bearing rod 2 from the fixed tube 3 and the kit, and avoid the situation where the load-bearing rod 2 is broken due to excessive load.

[0065] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A reel unwinding assembly for a back-sealing bag making machine, characterized in that: include: Load bearing seat; A load-bearing rod, one end of which is rotatably connected to the load-bearing seat; The other end of the load-bearing rod is away from the load-bearing seat; The load-bearing rod is arranged horizontally; A fixed pipe, wherein the fixed pipe is fixedly sleeved on the load-bearing rod; Coil units, the coil units are evenly arranged on the fixed tube; The coil unit includes a kit and a fixing member; The sleeve is slidably mounted on the fixed tube; the sleeve is used for winding the coiled material; The fixing member is used to limit the sliding movement of the sleeve on the fixing tube.

2. The unwinding assembly of a back-sealing bag making machine according to claim 1, characterized in that: At least one fixing groove is formed on the circumference of the fixing tube; the fixing groove is arranged along the axial direction of the fixing tube; the fixing groove runs through both ends of the fixing tube; The kit comprises two half rings; the two half rings are symmetrically spliced ​​with the axis of the fixed tube as the center, and are coaxial with the fixed tube after splicing; the side walls of the two half rings are respectively provided with a limit block; The two limit blocks are spliced ​​and slidably connected to the fixing groove; The fixing member is used to limit the two limit blocks from sliding in the fixing groove.

3. The unwinding assembly of a back-sealing bag making machine according to claim 2, characterized in that: The fixing member comprises two fixing blocks; The two fixing blocks are respectively connected to the same end of the corresponding limiting blocks; One of the fixing blocks is provided with a slot; the other fixing block is clamped in the slot.

4. The unwinding assembly of a back-sealing bag making machine according to claim 3, characterized in that: The card slot is provided with a tightening groove penetrating to the corresponding fixed block; the fixed block located in the card slot is provided with a tightening hole coaxial with and connected to the tightening groove; A fastening piece which is threadedly connected to the fastening hole is slidably connected in the fastening groove; One end of the abutting piece abuts against the fixing groove.

5. The unwinding assembly of the back-sealing bag making machine according to claim 4, characterized in that: There is a gap between one end of the fixing pipe close to the load-bearing seat and the side wall of the load-bearing seat; The distance of the gap is greater than the axial distance of the half rings.

6. The unwinding assembly of a back-sealing bag making machine according to any one of claims 1 to 5, characterized in that : The load-bearing seat is connected with an extended plate; The extended plate is arranged horizontally and is located directly below the fixed pipe.

7. The unwinding assembly of a back-sealing bag making machine according to claim 6, characterized in that: The extended plate is provided with an anti-wrinkle unit; the anti-wrinkle unit comprises an anti-wrinkle frame, an anti-wrinkle roller and an anti-wrinkle member; The two ends of the anti-wrinkle roller are rotatably connected to the anti-wrinkle frame; the anti-wrinkle roller is parallel to the fixed tube; The anti-wrinkle member is used to drive the anti-wrinkle frame to move so that the anti-wrinkle roller contacts the coil.

8. The unwinding assembly of a back-sealing bag making machine according to claim 6, characterized in that: A telescopic member is connected to the extended plate; the telescopic member is arranged vertically; the telescopic end of the telescopic member is connected to a supporting arc ring; the supporting arc ring is coaxial with the fixed tube; the telescopic member is used to drive the supporting arc ring to move so that the supporting arc ring supports the fixed tube.

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