Automatic film roll changing system for a film wrapping machine

Abstract

The application relates to the technical field of plastic film packaging equipment, and provides a film roll automatic replacement system for film packaging, which comprises a rack, two rotating discs arranged on the rack, a film connecting unit connected between the rack and the rotating discs, a light emitting and receiving module, and a film supporting roller arranged on the rotating disc through a film detecting arm swing; each rotating disc is provided with at least two shaft clamping grooves for mounting film roll shafts; the film connecting unit is used for cutting off the plastic film of a previous film roll shaft, and fusing the plastic film of a new film roll shaft and the plastic film being used; the light emitting and receiving module comprises a signal transmitting end and a signal receiving end; when the plastic film of the film roll shaft is used up, the film supporting roller is swung from below the plastic film to between the signal transmitting end and the signal receiving end, so that the light emitting and receiving module obtains a state parameter that the film roll shaft is used up. Through the technical scheme, the phenomenon that personnel are wasted due to early arrangement of artificial on-site continuous observation for confirming when the plastic film on the film roll is used up is solved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of plastic film packaging equipment, in particular, to a film roll automatic replacement system for film packaging. BACKGROUND

[0002] Plastic film is commonly referred to as plastic film or film. Plastic film is a film made of polyvinyl chloride, polyethylene, polypropylene, polystyrene and other resins, which is most widely used in the packaging field. Plastic film can be used for food packaging, electrical product packaging, daily necessities packaging, clothing packaging, etc.

[0003] Plastic film generally appears in the form of a film roll when applied. The plastic film on the film roll is transported to the packaging station through a traction and conveying structure for packaging workpieces. As the operation continues, the plastic film on the film roll will gradually run out. At this time, a new film roll needs to be replaced for subsequent production use. There are two common ways to replace the film roll, namely, replacing the film roll with machine stoppage and replacing the film roll without machine stoppage. Whether the machine is stopped or not, the old film roll that is being used and will soon be used up needs to be removed from the film roll support structure, and then a new film roll is replaced, connecting the starting head of the new film roll with the end head of the old film roll.

[0004] If the plastic film on the current film roll is not completely used up before the film roll is replaced, it will cause waste of plastic film packaging raw materials. Therefore, the film roll is usually replaced after the plastic film on the previous film roll is completely discharged, so as to improve the utilization rate of plastic film. Although the above method can improve the utilization rate of plastic film, it also raises another problem, such as how to determine when the plastic film will be used up. If the plastic film cannot be accurately determined when it will be used up, someone needs to be on duty at the scene and observe the use of the film roll all the time, which occupies labor. Therefore, the existing technology needs to be optimized to accurately determine when the plastic film on the current film roll will be used up, so as to avoid long-term occupation of labor for observation. SUMMARY

[0005] To overcome the above defects, embodiments of the present application provide a film roll automatic replacement system for film packaging, which solves the problem of wasting personnel in the related art to arrange personnel on duty at the scene to continuously observe when the plastic film on the film roll is used up.

[0006] According to one aspect, at least one embodiment of the present application provides a film roll automatic replacement system for film packaging, comprising:

[0007] a rack;

[0008] two rotating discs are symmetrically arranged on the rack, and each rotating disc is provided with at least two shaft clamping grooves corresponding to the shaft ends of the film roll shafts in the axial direction.

[0009] a film connecting unit connected between the frame and the rotating disc, the film connecting unit being configured to fuse the plastic films output from the two adjacent film reels;

[0010] a pair of photoelectric modules including a signal transmitting end and a signal receiving end arranged on the frame;

[0011] a film supporting roller arranged on the rotating disc through a film detecting arm, one end of the film detecting arm being connected to the rotating disc through a film detecting elastic member, and the other end of the film detecting arm being connected to the film supporting roller;

[0012] When the plastic film of the previous film reel is in normal use, the film detecting arm can drive the film supporting roller to swing and press against the plastic film under the action of the film detecting elastic member; and when the plastic film of the previous film reel is used up, the film detecting arm can drive the film supporting roller to swing to between the signal transmitting end and the signal receiving end, so that the pair of photoelectric modules obtain the state parameters of the plastic film of the previous film reel being used up and send the state parameters to the film connecting unit.

[0013] For example, in the film roll automatic replacement system for film coating provided by at least one embodiment of the present application, the film connecting unit comprises:

[0014] a film connecting upper part arranged on the frame and above the rotating disc, the film connecting upper part being provided with a fusion strip;

[0015] a bracket slidingly arranged on the rotating disc, the bracket being configured to move to below the film connecting upper part under the rotation of the rotating disc;

[0016] a film connecting lower part slidingly arranged on the bracket and capable of moving close to the film connecting upper part along with the bracket;

[0017] When the bracket moves to below the film connecting upper part along with the rotating disc, the film connecting lower part is pushed upward to abut against the plastic film of the previous film reel and continue to push the two layers of plastic films to abut against the fusion strip of the film connecting upper part to fuse the two layers of plastic films under the action of the sliding of the bracket.

[0018] For example, in the film roll automatic replacement system for film coating provided by at least one embodiment of the present application, the number of the film connecting lower parts is several, and the several film connecting lower parts are arranged in sequence along the axial direction of the rotating disc.

[0019] For example, in the film roll automatic replacement system for film coating provided by at least one embodiment of the present application, the film connecting unit further comprises:

[0020] A plurality of welding elastic members, each of which corresponds to at least one of the film receiving members, one end of each of the welding elastic members is arranged to act on the bracket, and the other end of each of the welding elastic members is arranged to act on the film receiving member, and the welding elastic members are arranged to provide a force to drive the film receiving member away from the bracket.

[0021] For example, the film roll automatic replacement system for film coating provided by at least one embodiment of the present application comprises a bracket, and the bracket is arranged to be driven to move up and down, and the bracket comprises a force receiving seat, and the film receiving member is arranged to be driven to move up and down, and the film receiving member comprises:

[0022] A film receiving telescopic member is arranged to be hinged to the frame and to extend downward;

[0023] An arm is arranged to be hinged to the frame, the upper end of the arm is arranged to be hinged to the telescopic end, and the lower end of the arm is arranged to have a lifting blade part arranged to push the force receiving seat upward;

[0024] When the telescopic end extends downward, the telescopic end drives the arm to swing so that the lifting blade part pushes the force receiving seat upward to drive the bracket and the film receiving member to move upward synchronously.

[0025] For example, the film roll automatic replacement system for film coating provided by at least one embodiment of the present application further comprises a film guiding unit, and the film guiding unit comprises:

[0026] A support strip is arranged on the frame and above the turntable;

[0027] A film pressing strip is arranged to swing on the turntable, and a plurality of film pressing pieces are arranged on the film pressing strip in the axial direction of the film pressing strip, and the film pressing pieces are arranged to press the plastic film output by the film roll against the peripheral wall of the support strip;

[0028] The film receiving roller is arranged to receive the plastic film passing between the film pressing piece and the support strip.

[0029] For example, the film roll automatic replacement system for film coating provided by at least one embodiment of the present application further comprises a buffer unit, and the buffer unit comprises:

[0030] A plurality of buffer frames are arranged to slide on the frame in the up-down direction, and the buffer frames are arranged to be spaced apart;

[0031] A plurality of buffer film winding rollers are arranged, and a plurality of buffer film winding rollers are arranged on each of the buffer frames, and the buffer film winding rollers are arranged to push the plastic film.

[0032] For example, the film roll automatic replacement system for film coating provided by at least one embodiment of the present application further comprises a conveying unit, wherein the conveying unit comprises:

[0033] A conveying main roller is rotatably arranged on the frame and above the rotating disc, and is configured to receive the plastic film supplied by the film roll shaft and to drive the plastic film to move after being rotated;

[0034] A conveying frame is slidably arranged on the frame, and two conveying sub-rollers are rotatably arranged on the conveying frame, and the conveying frame is configured to drive the two conveying sub-rollers to move downward after being slid, so that the two conveying sub-rollers abut against the plastic film on the outer periphery of the conveying main roller.

[0035] For example, the film roll automatic replacement system for film coating provided by at least one embodiment of the present application further comprises a tail removing unit, wherein the tail removing unit comprises:

[0036] Two tail removing arms are slidably arranged on the frame;

[0037] A tail removing shaft is rotatably arranged between the two tail removing arms;

[0038] A tail removing cylinder is slidably arranged on the tail removing shaft, and a plurality of circumferentially distributed adhesive strips are arranged on the outer periphery of the tail removing cylinder, and the length of the adhesive strips extends along the axial direction of the tail removing cylinder;

[0039] When the tail removing arms are slid downward, the tail removing shaft and the tail removing cylinder can be driven to slide downward synchronously, so that the adhesive strips on the tail removing cylinder abut against the plastic film wound on the film supporting roller, and the plastic film is adhered by the adhesive strips.

[0040] For example, the film roll automatic replacement system for film coating provided by at least one embodiment of the present application further comprises a tail removing unit, wherein the tail removing unit comprises:

[0041] A locking rod is slidably arranged on the frame in a horizontal direction, and the sliding direction of the locking rod is perpendicular to the axial direction of the rotating disc, and a locking block is arranged on the locking rod and slidably connected with the lock slot, and a connecting rod is arranged on the outer end of the locking rod and extends downward;

[0042] A guide rail is connected to the frame in a horizontal direction and is arranged at an angle with the main shaft of the rotating disc, and the guide rail extends outward from the frame;

[0043] A trigger member is slidably arranged on the frame in a horizontal direction and slidably connected with the lower end of the connecting rod, and a guide column is arranged on the trigger member and slidably connected with the guide rail;

[0044] Locking elastic member, one end acting on the locking rod, the other end acting on the rack;

[0045] Wherein, the lock block is clamped into the lock slot under the elastic tension provided by the locking elastic member, to lock the height position of the tail unit; the lock block can follow the membrane detection arm to swing synchronously, to abut and push the trigger, slide along the guide rail to make the lock block disengage from the lock slot.

[0046] The embodiment of the application has the following advantages:

[0047] In the application, the normally output plastic film is used to press the film supporting roller downward, and then drives the membrane detection arm to swing, so that the signal transmitting end and the signal receiving end are in signal communication state; when the plastic film on the film reel is output, the plastic film no longer applies force to the film supporting roller, and then the membrane detection elastic member drives the membrane detection arm to rotate, so that the membrane detection arm interrupts the signal communication state between the signal transmitting end and the signal receiving end, and realizes real-time monitoring of the use state of the plastic film; once the signal transmitting end and the signal receiving end are in signal disconnection state, it can be known that the plastic film is used up, which saves the on-site manual observation, improves the real-time monitoring, and releases the labor, and improves the comprehensive operation efficiency of the labor. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the application. Obviously, the drawings in the following description are only some example embodiments of the application. For those skilled in the art, other drawings can be obtained according to the contents of the example embodiments of the application and the drawings without any creative labor.

[0049] Figure 1 It is the left view of the whole in an embodiment of the application (hidden part of the rack, the outside of the turntable is obvious);

[0050] Figure 2 It is the left view of the whole in an embodiment of the application (hidden part of the rack, the outside of the turntable is obvious); Figure 1 It is the enlarged view of part A in the embodiment of the application;

[0051] Figure 3 It is the enlarged view of part B in the embodiment of the application; Figure 1 It is the structure schematic view of the whole in the embodiment of the application (one film reel works, the other film reel is preloaded);

[0052] Figure 4 It is the enlarged view of part B in the embodiment of the application; Figure 3 It is the enlarged view of part B in the embodiment of the application;

[0053] Figure 5 It is the enlarged view of part B in the embodiment of the application; Figure 3The second angle of the overall structure schematic diagram in the embodiment of

[0054] Figure 6 The second angle of the overall structure schematic diagram in the embodiment of Figure 5 The second angle of the overall structure schematic diagram in the embodiment of

[0055] Figure 7 The second angle of the overall structure schematic diagram in the embodiment of Figure 1 The second angle of the overall structure schematic diagram in the embodiment of

[0056] Figure 8 The second angle of the overall structure schematic diagram in the embodiment of Figure 1 The second angle of the overall structure schematic diagram in the embodiment of

[0057] Figure 9 The second angle of the overall structure schematic diagram in the embodiment of Figure 8 The second angle of the overall structure schematic diagram in the embodiment of

[0058] Figure 10 The second angle of the overall structure schematic diagram in the embodiment of Figure 8 The second angle of the overall structure schematic diagram in the embodiment of

[0059] Figure 11 The second angle of the overall structure schematic diagram in the embodiment of Figure 10 The second angle of the overall structure schematic diagram in the embodiment of

[0060] Figure 12 The second angle of the overall structure schematic diagram in the embodiment of Figure 8 The second angle of the overall structure schematic diagram in the embodiment of

[0061] In the figure: 10, rack, 11, rotating disc, 111, shaft clamping groove, 112, film fixing strip, 1121, film fixing piece, 113, limiting column, 12, photoelectric module, 121, signal transmitting end, 122, signal receiving end, 13, film detecting arm, 131, extension rod, 132, limiting groove, 14, film supporting roller, 15, film detecting elastic piece, 16, shaft hook, 20, film connecting unit, 21, upper film connecting piece, 22, melting strip, 23, bracket, 231, force receiving seat, 24, lower film connecting piece, 25, melting elastic piece, 30, film connecting driving unit, 31, film connecting extension piece, 310, extension end, 32, bent arm, 321, bent blade part, 40, film guiding unit, 41, supporting strip, 42, film pressing strip, 43, film pressing piece, 50, buffer unit, 51, buffer bracket, 52, buffer film winding roller, 60, conveying unit, 61, main conveying roller, 62, conveying bracket, 63, auxiliary conveying roller, 70, tail removing unit, 71, tail removing arm, 711, locking groove, 72, tail removing shaft, 721, guide block, 73, tail removing cylinder, 731, guide groove, 74, adhesive strip, 75, tail removing elastic piece, 80, tail removing driving unit, 81, locking rod, 811, locking block, 82, trigger piece, 83, connecting rod, 84, locking elastic piece, 85, guide rail, 90, film winding shaft, 91, plastic film. DETAILED DESCRIPTION

[0062] The application will be further described below in conjunction with the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not to be used as limitations.

[0063] For the purpose of clarity, only the parts of the apparatus that are pertinent to the disclosure are shown in the drawings, and they do not represent the actual structure of the product. In addition, for the purpose of simplicity and clarity, in some of the drawings, only one of the components with the same structure or function is shown schematically, or only one of them is labeled. In this document, "one" means not only "only one", but also "more than one", and "several" includes "two" and "more than two".

[0064] In this document, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connected", "connection" should be interpreted broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium; it can be internal connection of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0065] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. "Under", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0066] In the description of the present embodiment, the orientation or position relationship of the terms "up", "down", "left", "right" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0067] In addition, in the description of the present application, the terms "first", "second" and the like are only used for differentiation and description, and cannot be understood as indicating or implying relative importance.

[0068] As Figures 1 to 12As shown in the figure, it shows a film roll automatic replacement system for film coating in an embodiment of the present application, which can be used for various products coated with plastic film 91, such as rock wool block / plate, plastic plate and similar products. Through the film roll automatic replacement system, the plastic film 91 to be replaced and the plastic film 91 about to be used up can be heated, melted and connected together.

[0069] In this embodiment, referring to Figure 1 and Figure 3 As shown in the figure, the film roll automatic replacement system includes a rack 10 and two rotating discs 11. The rack 10 provides a support base for the entire film roll automatic replacement system, and the two rotating discs 11 are coaxial and spaced apart and rotate on the rack 10. The rotating driving force of the rotating discs 11 is provided by a manually or electrically driven motor. Between the two rotating discs 11 is placed a film roll shaft 90, which is a consumable raw material formed by winding the plastic film 91 produced and shaped into a shaft / tube. The film roll shaft 90 is used to provide the plastic film 91, which is coated on the periphery of other products such as rock wool. After being coated with the plastic film 91, a plurality of single products form a packaged whole, which is convenient for the transportation and delivery of the products.

[0070] Further, taking the example of two film roll shafts 90 arranged between the two rotating discs 11, a shaft slot 111 is formed on each rotating disc 11. The two rotating discs 11 have one-to-one corresponding shaft slots 111. When in use, the two ends of the shaft / tube at the center of the film roll shaft 90 are respectively clamped in the corresponding shaft slots 111 of the two rotating discs 11. The film roll shaft 90 can rotate in the shaft slot 111, which is convenient for releasing and outputting the plastic film 91.

[0071] Referring to Figure 1 As shown in the figure, each rotating disc 11 is additionally provided with a rotating shaft hook 16. The shaft hooks 16 are arranged next to the shaft slots 111. The shaft hooks 16 are L-shaped as a whole, and a hook slot is formed at the middle bending part of the shaft hooks 16. Each shaft slot 111 is provided with one corresponding shaft hook 16. When the film roll shaft 90 is placed in position, the hook slot is just opposite to the two ends of the shaft / tube of the film roll shaft 90 by rotating the shaft hook 16. The film roll shaft 90 is prevented from being separated from the shaft slot 111 by the shaft hook 16.

[0072] In normal operation, the film reel 90 being operated is clamped in one of the clamping shaft slots 111, and the corresponding shaft hook 16 hooks the two ends of the shaft / barrel of the film reel 90 being used, and the output plastic film 91 passes below the film connecting upper part 21 and the melting strip 22. At this time, the new film reel 90 to be replaced can be pre-installed in the clamping shaft slot 111 of the rotating disc 11, and then the corresponding shaft hook 16 is rotated so that the hook groove on the shaft hook 16 is aligned and hooks the two ends of the shaft / barrel at the center of the film reel 90, preventing the film reel 90 from being disengaged from the clamping shaft slot 111; then, the starting end of the plastic film 91 on the new film reel 90 is pulled and passed outside the film connecting lower part 24, waiting for the replacement operation of the film reel 90.

[0073] Referring to Figures 1 to 2 As shown, the frame 10 is provided with a pair of light emitting and receiving modules 12, and the signal emitting end 121 and the signal receiving end 122 of the light emitting and receiving modules 12 can be arranged in opposite positions; the signal emitting end 121 and the signal receiving end 122 are located above the side of the rotating disc 11; each rotating disc 11 is swingably provided with two film detecting arms 13, and the two film detecting arms 13 correspond to the two film reels 90, and the two film detecting arms 13 share one light emitting and receiving module 12; one film supporting roller 14 is rotatably arranged at the end of each film detecting arm 13 beyond the outer periphery of the rotating disc 11; a film detecting elastic member 15 is arranged between each film detecting arm 13 and the rotating disc 11, and the film detecting elastic member 15 can be selected from the existing spring, one end of the film detecting elastic member 15 acts on the film detecting arm 13, and the other end of the film detecting elastic member 15 acts on the baffle extending from the rotating disc 11. Figure 2 As shown, a limiting slot 132 is formed in the film detecting arm 13, and a limiting column 113 penetrating through the limiting slot 132 is arranged on the rotating disc 11, and the limiting column 113 and the limiting slot 132 are in sliding fit.

[0074] Among them, the film detecting arm 13, the film supporting roller 14 and the film detecting elastic member 15 corresponding to the film reel 90 outputting the plastic film 91 are defined as arm M, roller M and elastic member M respectively; the film detecting arm 13, the film supporting roller 14 and the film detecting elastic member 15 corresponding to the film reel 90 to be replaced are defined as arm N, roller N and elastic member N respectively.

[0075] Continuing to refer to Figures 1 to 6 As shown, the film connecting unit 20 includes a film connecting upper part 21, a bracket 23, a film connecting lower part 24 and a melting elastic member 25, as Figure 1 and Figure 3 As shown, the melting strip 22 is arranged at the lower end of the film connecting upper part 21, and the melting strip 22 is in the form of a wire strip as a whole, and the two ends of the melting strip 22 are electrically connected to an external power supply (not shown in the figure), and the melting strip 22 can generate heat after being electrified, so as to soften the plastic film 91, and realize the melting or melting of the plastic film 91. As Figure 1 and Figures 3 to 4As shown in the figure, the bracket 23 is slidably arranged on the rotating disc 11, and a plurality of film receiving lower parts 24 are sequentially arranged on the bracket 23. The film receiving lower part 24 is provided with a sliding rod on the side close to the bracket 23, and the bracket 23 is provided with a sliding groove on the side close to the film receiving lower part 24, and the sliding rod and the sliding groove are in sliding fit. All the film receiving lower parts 24 share one film receiving upper part 21, and at least one fusion elastic part 25 is arranged between each film receiving lower part 24 and the bracket 23. The fusion elastic part 25 can be a stretchable spring in the prior art.

[0076] Referring to Figure 1 , Figure 3 and Figure 5 , it can be seen that two clamping shaft grooves 111 are arranged on each rotating disc 11, that is, two film reel shafts 90 can be placed on each rotating disc 11 at the same time, and two sets of brackets 23 are arranged along the circumference of the rotating disc 11, and one set of film receiving lower parts 24 is arranged on each bracket 23. Each set of film receiving lower parts 24 includes a plurality of film receiving lower parts 24 arranged along the axis of the rotating disc 11. Corresponding to the two film reel shafts 90.

[0077] Continuing to refer to Figures 1 to 7 , the film reel automatic changing system is provided with two film guiding units, which include a support strip 41, a pressing film strip and a pressing film piece 43. Specifically, the support strip 41 is in the shape of a long cylindrical or columnar body, and the outer surface is smooth. The axis is parallel to the axis of the two rotating discs 11, and the two ends of the support strip 41 are fixedly connected to the rack 10. The pressing film strip is in the shape of a long strip, which can be a cylindrical / cylindrical, square column / cylinder, etc. The two ends of the pressing film strip are fixedly connected to the side face of the two rotating discs 11 close to each other, and a plurality of pressing film pieces 43 are arranged on the support strip 41 along the axis. The pressing film piece 43 can be made of silicone material, and has elastic deformation. The two film guiding units share one support strip 41, and the two pressing film strips correspond to the two clamping shaft grooves 111 on the rotating disc 11. One of the pressing film strips (defined as pressing strip M) is used for the film reel shaft 90 that is working, and the corresponding pressing film piece 43 is defined as pressing piece M. The other pressing film strip (defined as pressing strip N) corresponds to the film reel shaft 90 to be replaced, and the corresponding pressing film piece 43 is defined as pressing piece N.

[0078] Referring to Figure 1 , Figure 3 and Figures 5 to 6As shown, two film fixing bars 112 are added on the rotating disc 11, and each film fixing bar 112 is provided with a plurality of film fixing pieces 1121 distributed along the axial direction of the film fixing bar 112; the two film fixing bars 112 correspond to the two film reels 90 on the rotating disc 11 respectively, one of the film fixing bars 112 (defined as fixing bar M) corresponds to the film reel 90 working, and the corresponding film fixing piece 1121 is defined as fixing piece M; the other film fixing bar (defined as fixing bar N) corresponds to the film reel 90 to be replaced, and the corresponding film fixing piece 1121 is defined as fixing piece N. The film fixing piece 1121 can be made of silica gel material, and the film fixing piece 1121 has an elastic deformation amount. The starting end of the plastic film 91 on the latter film reel 90 is pressed to the side of the bracket 23 by the film fixing piece 1121 of the film fixing bar 112, and the initial fixing of the plastic film 91 is completed.

[0079] In operation, referring to Figures 1 to 2 As shown, the film reel 90 located on the right side of the rotating disc 11 is the film reel 90 working normally, corresponding to the pressing bar M, the fixing bar M, the arm M, the roller M and the elastic member M. The plastic film 91 output by the working film reel 90 passes between the pressing piece M and the supporting bar 41, at this time the pressing piece M is slightly bent and deformed and presses the plastic film 91 against the peripheral wall of the supporting bar 41; the clamping of the plastic film 91 is realized, and the conveying direction of the plastic film 91 can be guided at the same time.

[0080] The plastic film 91 passing between the pressing piece M and the supporting bar 41 is wound above the roller M from right to left, and then the plastic film 91 is wound in turn from below the film receiving member 21 and upwardly wound on the outer periphery of the roller for guiding on the upper part of the rack 10, so as to guide the plastic film 91 to the next working component. The plastic film 91 wound above the roller M presses downwardly on the roller M, the roller M drives the arm M to swing counterclockwise on the rotating disc 11 by a certain angle, the arm M is away from between the signal transmitting end 121 and the signal receiving end 122, at this time the signal transmitting end 121 and the signal receiving end 122 are switched from the signal disconnected state to the signal connected state. After the arm M swings to a certain angle, the limiting column 113 abuts against the right end part (defined as the first end) of the limiting groove 132, the arm M after swinging drives the elastic member M to elongate, the elongated elastic member M is deformed and accumulates elastic force. At this time, there is no contact between the corresponding fixing bar M and the plastic film 91, and the fixing bar M and the bracket 23 are in a natural abutting state.

[0081] Referring to Figures 1 to 2As shown, the film reel 90 on the left side of the turntable 11 is the film reel 90 to be replaced, corresponding to the pressing piece N, the fixed piece N, the arm N, the roller N and the elastic member N, at this time the film reel 90 has been clamped into the clamping shaft slot 111; the starting end of the film reel 90 to be replaced is led out from the left side, passing above the film receiving lower part 24, and finally passing between the fixed piece N and the bracket 23, the starting end is abutted on the bracket 23 by the fixed piece N, so that the fixing of the starting end of the plastic film 91 is realized. At this time, the pressing piece N and the roller N corresponding to the previous film reel 90 are not in contact with the plastic film 91. The elastic member N is in a natural stretching or elongation state, and the limiting column 113 is in abutment with the other end (defined as the second end) of the limiting slot 132.

[0082] Referring to Figures 1 to 2 As shown, when the plastic film 91 on the film reel 90 on the right side is used up, at this time the tail of the plastic film 91 is separated from the film reel 90 to form a tail, when the tail passes from below between the support bar 41 and the pressing piece M from below to above, the support bar 41 is directly in abutment with the pressing piece M; after the tail end is no longer extruded by the pressing piece M, the plastic film 91 above the roller M no longer applies a downward moving force to the roller M, and then the tail end of the plastic film 91 is locked by other locking structures (for example, two extrusion modules, which extrude and lock the plastic film 91); at this time, the elastic member M releases the accumulated elastic force, drives the arm M to rotate clockwise on the turntable 11, moves one end of the arm M on which the roller M is installed between the signal emitting end 121 and the signal receiving end 122, and changes the signal from the signal connection state to the signal disconnection state; after the signal is disconnected, the signal receiving end 122 will transmit the change of the signal to the external controller, the external controller starts the driving device for providing the driving force for the rotation of the turntable 11, the driving device drives the turntable 11 to rotate clockwise by a certain angle and then stops rotating, at this time the bracket 23 and the film receiving lower part 24 are just below the film receiving upper part 21; there is a new plastic film 91 head and an old plastic film 91 tail between the film receiving lower part 24 and the film receiving upper part 21; then an external force is applied to drive the bracket 23 and the film receiving lower part 24 to slide towards the film receiving upper part 21, until the film receiving lower part 24 pushes the two layers of plastic film 91 to the lower end of the film receiving upper part 21 and abuts, and then an external power supply is started to supply power, and the fusion of the two layers of plastic film 91 is completed by the fusion strip 22.

[0083] In the process of rotating the turntable 11 with the film receiving lower part 24 to below the film receiving upper part 21, the pressing piece M deforms, finally slides from below the side of the support bar 41 and separates from the support bar 41.

[0084] Referring to Figures 1 to 6As shown, the bracket 23 is provided with a force receiving seat 231 near the outer peripheral edge of the turntable 11, and the rack 10 is additionally provided with the film receiving driving units 30, the number of which is two and which are arranged one by one corresponding to the force receiving seats 231, and the two film receiving driving units 30 are located on the side away from each other of the two turntables 11. Each film receiving driving unit 30 comprises a film receiving telescopic member 31 and a rocker arm 32, the film receiving telescopic member 31 has a telescopic end 310, and the film receiving telescopic member 31 can be a linear telescopic cylinder in the prior art, or a hydraulic cylinder or an electric cylinder with the same function, and taking the linear telescopic cylinder as an example, the film receiving telescopic member 31 corresponds to the cylinder body of the cylinder, and the telescopic end 310 corresponds to the free end of the cylinder; one end of the film receiving telescopic member 31 is hinged to the rack 10, and the telescopic end 310 is hinged to one end of the rocker arm 32; the middle part of the rocker arm 32 is hinged to the rack 10, and the other end of the rocker arm 32 is provided with a rocker blade part 321.

[0085] When the film roll 90 does not need to be replaced, the film receiving driving unit 30 is in the storage state, and at this time, the height of the rocker blade part 321 is at the lowest state. When the film roll 90 needs to be replaced, an external driving device (such as a motor) is started, the turntable 11 is driven to rotate by the power output by the driving device, and when the rotating turntable 11 reaches the preset position, the driving device stops power output. At this time, the bracket 23 is located on the side of the rocker blade part 321, the force receiving seat 231 is located above the rocker blade part 321, and the film receiving lower member 24 is located below the film receiving upper member 21; then the film receiving telescopic member 31 is started, and the force output by the film receiving telescopic member 31 drives the telescopic end 310 to move downward, the telescopic end 310 moves downward and synchronously drives one end of the rocker arm 32 (the telescopic end 310 is hinged to the rocker arm 32) to move downward, and then drives the rocker arm 32 to swing on the rack 10, so that the end of the rocker arm 32 provided with the rocker blade part 321 moves upward, and the upward moving rocker blade part 321 abuts against the force receiving seat 231; with the continuous downward movement of the telescopic end 310, the rocker blade part 321 pushes upward and makes the force receiving seat 231 slide upward.

[0086] When the force receiving seat 231 is located above the rocker blade part 321, refer to Figures 1 to 2 and Figure 7As shown, at this time, the bracket 23 and the film lower piece 24 are just below the film upper piece 21, the force bearing seat 231 sliding upward drives the bracket 23, all the fusion elastic pieces 25 and all the film lower pieces 24 to slide upward at the same time, the film lower piece 24 gradually approaches the film upper piece 21 with the new plastic film 91, and the new (to be replaced) plastic film 91 will first abut against the old (in use) plastic film 91; as the telescopic end 310 moves to the first preset position, in the process of continuous upward movement of the bracket 23, the film lower piece 24 presses the new and old two layers of plastic films 91 to the lower side of the film upper piece 21, and the old plastic film 91 abuts against the fusion strip 22; then the fusion strip 22 is powered and heated, the two layers of plastic films 91 are heated and changed in shape and fused together, the connection of the plastic film 91 is completed, the continuous operation of the film coating work is ensured, the length of the waste head and tail of the plastic film 91 is reduced, the raw material cost of the film coating is reduced, at the same time, the traction workload of the starting end of the plastic film 91 on the new film reel 90 is reduced, and the overall work efficiency is improved; the new film reel 90 only needs to complete the winding work and preparation work before the old film reel 90 is used up, and the flexibility of the on-site work of the staff is improved.

[0087] The film upper part 21 and the film lower part 24 clamp the two layers of plastic film 91 through the film clamping extension 31 and the arm 32. Then the extension end 310 continues to move a distance to the second preset position, and the bracket 23 continuously moves upward during the process, the melting elastic member 25 is extruded, the melting elastic member 25 extrudes the film lower part 24, and the melting elastic member 25 shrinks to accumulate elastic force under stress; through the elastic change of the melting elastic member 25, the film lower part 24 has a trend of moving upward, that is, even if the film upper part 21 is locally or entirely deformed or deviated, the melting elastic member 25 can ensure that the film lower part 24 and the film upper part 21 have a stable clamping force, and ensure the clamping state of the two layers of plastic film 91. When the film upper part 21 is locally or entirely concave or moves upward, the melting elastic member 25 at the corresponding position can release the accumulated elastic force, so that the film lower part 24 at the corresponding position continues to move upward, so as to ensure that the film lower part 24 and the film upper part 21 clamp the two layers of film; when the film upper part 21 is locally or entirely convex or moves downward, the bracket 23 moves upward, the melting elastic member 25 at the corresponding position generates a greater shrinkage deformation, so that the height of the film lower part 24 at the corresponding position is lower than that of the film lower part 24 at other normal positions, so as to avoid hard extrusion between the film lower part 24 and the film upper part 21, reduce damage to the equipment, and also avoid physical breaking of the two layers of plastic film 91 between the film lower part 24 and the film upper part 21. Through the elastic change of the melting elastic member 25, the film lower part 24 and the film upper part 21 can dynamically adjust the clamping operation of the two layers of plastic film 91, which not only ensures effective elastic clamping, but also avoids breaking, and ensures the heating and melting effect of the melting strip 22 on the two layers of film.

[0088] Referring to Figure 1 、 Figure 3 、 Figure 5 and Figure 7 , the buffer unit 50 and the conveying unit 60 are arranged at the upper part of the rack 10, the buffer unit 50 includes a buffer frame 51 and a buffer winding roller 52, the conveying unit 60 includes a conveying main roller 61, a conveying auxiliary roller 63 and a conveying frame 62, and when working, referring to Figure 1 , the plastic film 91 passing between the support strip 41 and the tablet M passes through the rollers arranged on the rack 10 and used for guiding, and then is wound on the upper half of the conveying main roller 61 from left to right, the conveying frame 62 slides up and down through the extension cylinder arranged on the rack 10, when the extension cylinder is elongated, the conveying frame 62 and the conveying auxiliary roller 63 slide downward until the conveying auxiliary roller 63 abuts against the plastic film 91 wound on the upper half of the conveying main roller 61, and the rotation driving force output by the external motor is used as the power source of the conveying main roller 61, so that the conveying main roller 61 rotates to drive the plastic film 91 to convey; and the active feeding speed of the plastic film 91 is convenient to control, so as to adapt to the actual working needs.

[0089] At the same time, the plastic film 91 will be wound on the buffer winding film roller 52 up and down at the buffer unit 50, forming a serpentine distribution, to buffer the plastic film 91, the buffer frame 51 can slide up and down, and then the length of the plastic film 91 stored at the buffer unit 50 can be adjusted; when the film roll needs to be replaced, the height position of the conveying frame 62 is adjusted, and then the extrusion force between the conveying auxiliary roller 63 and the conveying main roller 61 is adjusted, the tail of the plastic film 91 is locked, the new plastic film 91 and the old plastic film 91 are welded, the plastic film 91 temporarily stored by the buffer unit 50 can realize online replacement of the film roll shaft 90, realize non-stop roll replacement, improve the overall operation efficiency, and eliminate the downtime loss caused by stoppage for roll replacement.

[0090] Referring to Figure 1 , Figure 3 and Figures 8 to 12 , the tail removal unit 70 and the tail removal driving unit 80 are added on the rack 10, the tail removal unit 70 includes a tail removal arm 71, a tail removal shaft 72 and a tail removal cylinder 73; the tail removal driving unit 80 includes a locking rod 81, a trigger 82, a connecting rod 83 and a locking elastic member 84; wherein the extension rod 131 is arranged on the film inspection arm 13, and the locking groove 711 is arranged on the tail removal arm 71.

[0091] In normal operation, referring to Figures 7 to 11As shown, in addition to the tail shaft 72 and the tail cylinder 73 located above the roller M, the locking block 811 is located in the locking groove 711; when the plastic film 91 on the old film reel 90 is used up, the tail of the plastic film 91 passes from below to above between the supporting strip 41 and the pressing piece M, and at the same time the plastic film 91 above the roller M no longer applies a downward moving force to the roller M, at this time the arm M rotates clockwise on the turntable 11 (the film supporting roller 14 gradually moves away from the film receiving lower part 24), when the arm M rotates, the extension rod 131 on the arm M moves synchronously, the extension rod 131 is in extrusion contact with the triggering piece 82; a horizontally inclined guide rail 85 is arranged on the rack 10 at the side of the extension rod 131, the triggering piece 82 is in sliding fit with the guide rail 85; with the rotation of the arm M, the extension rod 131 pushes the triggering piece 82 to slide along the direction of the guide rail 85, while the triggering piece 82 moves in the same direction with the extension rod 131, the triggering piece 82 also gradually moves away from the turntable 11 and the extension rod 131 in the axial extension direction of the turntable 11; while moving, the triggering piece 82 moves the connecting rod 83 synchronously through the dovetail groove slide rail on the triggering piece 82 (moves in the direction away from the film receiving lower part 24), at the same time the triggering piece 82 and the connecting rod 83 slide relatively; the connecting rod 83 moves synchronously with the locking rod 81, the locking rod 81 drives the locking block 811 to gradually move away from the locking groove 711 and separate the locking block 811 from the locking groove 711; when the locking block 811 separates from the locking groove 711, the tail removing arm 71 slides downward synchronously with the tail shaft 72 and the tail cylinder 73. When the locking block 811 moves away from the locking groove 711, the locking elastic piece 84 is stretched under stress and accumulates elastic force, and the locking elastic piece 84 is selected from the prior art.

[0092] With the continuous swinging of the extension rod 131 following the arm M, the triggering piece 82 gradually moves away from the extension rod 131 along the guide rail 85 under the extrusion of the extension rod 131 and separates from the extension rod 131, the arm M finally swings to between the signal emitting end 121 and the signal receiving end 122, blocks the signal between the signal emitting end 121 and the signal receiving end 122, and then fixes and locks the tail of the plastic film 91 by means of the corresponding mechanism, the tail of the plastic film 91 is overlapped on the film supporting roller 14; the tail cylinder 73 slides down to abut against the plastic film 91 on the film supporting roller 14, and the adhesive tape 74 on the outer periphery of the tail cylinder 73 is bonded with the plastic film 91; wherein referring to Figure 12As shown, in addition to the tail cylinder 73 inner wall on which a guide groove 731 is provided, in addition to the tail shaft 72 outer periphery on which an arc-shaped guide block 721 is connected through a tail elastic member 75, the tail elastic member 75 is selected from the prior art spring, the arc-shaped guide block 721 is matched with the shape of the guide groove 731, and the guide groove 731 and the guide block 721 are both a plurality of and one-to-one corresponding along the axial direction of the tail cylinder 73 inner wall, and a plurality of group guide blocks 721 are arranged along the axial direction of the tail shaft 72; when the tail cylinder 73 is installed, the positions of the guide groove 731 and the guide block 721 are aligned, the tail cylinder 73 is pushed along the axial direction of the tail shaft 72, so that the tail cylinder 73 is sleeved on the tail shaft 72, and the tail shaft 72 and the tail cylinder 73 are synchronously rotated through the sliding connection of the guide groove 731 and the guide block 721; at the same time, the sliding cooperation of the guide groove 731 and the arc-shaped guide block 721 facilitates the disassembly and assembly of the tail cylinder 73.

[0093] When the roll is changed, the film splicing unit 20 splices the two layers of films together as the rotating disc 11 continues to rotate; during the splicing process, the tail shaft 72 is driven to rotate through the combination of the external motor, the sprocket and the chain, and then the guide block 721 and the tail cylinder 73 are sequentially driven to rotate in the same direction, the old plastic film 91 is heated, the rotating tail cylinder 73 collects the tail of the plastic film 91 on the tail cylinder 73 through the adhesive tape 74, after the roll changing is completed, the tail of the plastic film 91 adhered to the adhesive tape 74 is removed, the appearance of the spliced part of the plastic film 91 is improved, and the tail cleaning operation is realized.

[0094] When the two layers of films are spliced, the tail arm 71 is driven to slide upward through the external linear driver (such as a pneumatic cylinder or an electric cylinder, etc. which can realize linear driving), the tail of the plastic film 91 is moved away from the film supporting roller 14, and the rotating tail rotating disc 11 avoids collision and interference with the film splicing lower part 24 and the bracket 23.

[0095] When the tail arm 71 slides upward to the position where the lock block 811 is aligned with the lock groove 711, the tail arm 71 stops rising; the elongated locking elastic member 84 releases the accumulated elastic force, pulls the locking rod 81 and the lock block 811 to slide toward the lock groove 711, until the lock block 811 is clamped into the lock groove 711, and the tail cylinder 73 is prevented from sliding downward through the mechanical locking of the lock block 811 and the lock groove 711.

[0096] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. An automatic film roll changing system for coating, characterized in that, The system includes a frame, a turntable, a film-attaching unit, a photoelectric sensor module, and a film-supporting roller. Two turntables are symmetrically mounted on the frame, each with at least two axially corresponding retaining grooves for mounting the ends of film rolls. The film-attaching unit connects the frame and the turntables and is used to weld plastic films output from two adjacent film rolls. The photoelectric sensor module includes a signal transmitter and a signal receiver mounted on the frame. The film-supporting roller is oscillating on the turntable via a film-detecting arm. One end of the film-detecting arm is connected to the turntable via a film-detecting elastic element, and the other end is connected to the film-supporting roller. The film-detecting arm has a horizontally outward-extending extension rod. When the plastic film on the current film roll is in normal use, the film inspection arm can drive the film support roller to swing and press against the bottom of the plastic film under the action of the film inspection elastic element; After the plastic film of the previous film roll is used up, the film detection arm can drive the film support roller to swing between the signal transmitting end and the signal receiving end under the action of the film detection elastic element so that the through-beam photoelectric module can obtain the status parameter that the plastic film of the previous film roll has been used up and send the status parameter to the film receiving unit. The film-bonding unit includes an upper film-bonding component, a bracket, and a lower film-bonding component. The upper film-bonding component is disposed on the frame and located above the turntable, and is provided with a welding strip. The bracket is slidably disposed on the turntable, and is configured to move below the upper film-bonding component under the rotation of the turntable. The lower film-bonding component is slidably disposed on the bracket and can move with the bracket and approach the upper film-bonding component. It also includes a tail removal unit, which includes a tail removal arm, a tail removal shaft, and a tail removal cylinder. Two tail removal arms are provided, each sliding vertically on the frame, and each tail removal arm has a locking groove. The tail removal shaft is rotatably positioned between the two tail removal arms. The tail removal cylinder is slidably sleeved on the tail removal shaft, and has several circumferentially distributed adhesive strips on its outer circumference, the length of which extends along the axial direction of the tail removal cylinder. When the tail removal arm slides downwards, it can drive the tail removal shaft and the tail removal cylinder to slide downwards synchronously, so that the adhesive strips on the tail removal cylinder abut against the plastic film wound around the film support roller, thereby adhering the plastic film with the help of the adhesive strips. It also includes a tail removal transmission unit, which comprises a locking rod, a guide rail, a trigger, and a locking elastic element. The locking rod is horizontally slidably mounted on the frame, and the sliding direction of the locking rod is perpendicular to the axial direction of the turntable. The locking rod is provided with a locking block that slides with the locking groove, and the outer end of the locking rod is provided with a downwardly extending connecting rod. The guide rail is horizontally connected to the frame and is set at an angle to the turntable spindle, extending outward from the frame. The trigger is horizontally slidably mounted on the frame and slides with the lower end of the connecting rod. The trigger is provided with a guide post that slides with the guide rail. One end of the locking elastic element acts on the locking rod, and the other end acts on the frame. The locking block is engaged in the locking groove under the elastic tension provided by the locking elastic member to lock the height position of the tail removal unit; the device can swing synchronously with the film inspection arm to abut and push the trigger member, and slide along the guide rail to disengage the locking block from the locking groove.

2. The automatic film roll changing system for coating according to claim 1, characterized in that, When the bracket moves with the turntable to below the upper film attaching component, the lower film attaching component pushes the plastic film of the next film roll upwards under the sliding action of the bracket until it fits with the plastic film of the previous film roll, and continues to push the two layers of plastic film until they abut against the welding strip of the upper film attaching component to weld the upper and lower plastic films.

3. The automatic film roll changing system for coating according to claim 2, characterized in that, The number of the membrane attaching components is several, and they are all slidably disposed on the bracket. The several membrane attaching components are distributed sequentially along the axial direction of the turntable.

4. The automatic film roll changing system for coating according to claim 3, characterized in that, The membrane unit further includes: There are several welding elastic elements, and each of the film-attached parts corresponds to at least one welding elastic element. One end of the welding elastic element acts on the bracket, and the other end acts on the film-attached part. The welding elastic element is used to provide a force to move the film-attached part away from the bracket.

5. The automatic film roll changing system for coating according to claim 3, characterized in that, The bracket has a force-bearing seat, and the automatic film roll changing system for coating further includes a film splicing drive unit, which includes: A membrane telescopic component has a telescopic end, the membrane telescopic component is hinged to the frame and extends downward; A rocker arm is hinged to the frame, with its upper end hinged to the telescopic end and its lower end having a rocker blade for pushing the force-bearing seat upward. When the telescopic end extends downward, the telescopic end drives the tilting arm to swing so that the tilting blade pushes the force-bearing seat upward, thereby driving the bracket and the membrane lower piece to move upward synchronously.

6. The automatic film roll changing system for coating according to claim 1, characterized in that, It also includes a buffer unit, which comprises: Two buffer frames are provided, which are slidably mounted on the frame in the vertical direction and are spaced apart. A plurality of buffer film-winding rollers are provided, and each buffer frame is provided with a plurality of buffer film-winding rollers, which are used to push the plastic film.

7. The automatic film roll changing system for coating according to claim 1, characterized in that, It also includes a conveying unit, which comprises: The main conveyor roller is rotatably mounted on the frame and located above the turntable. The main conveyor roller is used to receive the plastic film fed by the film roll and is configured to drive the plastic film to move after rotation. A conveyor frame is slidably mounted on the machine frame. Two auxiliary conveyor rollers are rotatably mounted on the conveyor frame. The conveyor frame is configured to slide and drive the two auxiliary conveyor rollers to move downwards so that the two auxiliary conveyor rollers abut against the plastic film on the outer periphery of the main conveyor roller.

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