Automatic film winding and cutting method and device for a film wrapping machine

Abstract

The application discloses a kind of automatic film and film cutting method and device of wrapping film packing machine, belong to automation technical field.Method includes: packing film is wound to the penultimate circle downwards, lifting plate rises, and packing film is wound to the outside of lifting plate;Upper die structure overturns to vertical and it is located at the outside of packing film;Packing film is wound to the last circle, and film frame stops after winding to the outside of upper die structure, and packing film is clamped by film clamping ring;Overturning film cutting mechanism overturns to vertical, and packing film is pressed by clamping plate, heating plate is located at the adjacent outside of packing film, and heating wire cuts packing film and forms end;Heating plate blows inwards;After packing film is cut, end of packing film moves inwards and adheres to the penultimate circle packing film, and overturning film cutting mechanism overturns to horizontal first, and lifting plate drops again, and the lower side of packing film is in abutment on the baffle of adjacent outside of lifting plate, and packing film moves inwards due to resilience;At the same time, upper die structure overturns to horizontal.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of automation, in particular relates to an automatic film feeding and film cutting method and device of a wrapping film packing machine, and more particularly relates to a wrapping film packing machine and a packing method of a glass bottle. BACKGROUND

[0002] Beer bottles need to be stacked and packed before leaving the factory. In the prior art, the stacking is first bundled, and then wrapped and packed by a wrapping film packing machine.

[0003] For example, patent No. CN202120755259.2 discloses a full-automatic high-speed rocker arm wrapping packaging machine system, which comprises a support fixed on the ground, a rotating motor and a rotating frame connected at the top of the support, and the support and the rotating frame are coaxially arranged, a constant tension film covering mechanism and an automatic film cutting mechanism are installed on the rotating frame, and a chain line is arranged in the space below the rotating frame. The automatic film cutting mechanism is located at the bottom of the other side column of the rotating frame, and the top of the side column is connected with a film cutting lifting motor. The film cutting lifting motor drives the automatic film cutting mechanism to make vertical lifting movement along the direction of the column.

[0004] For example, patent No. CN200620090605.5 discloses a full-automatic stretch wrapping machine, which comprises a lifting motor driven film lifting device, an electric control cabinet and a film pre-stretching device on the machine base; a turntable rotating device driven by a turntable motor is installed on the machine base, and a goods conveying device and an automatic film feeding and film sticking device are installed on the turntable. The utility model increases the tray conveying device, the film pressing and cutting device, the film blocking device, the film pulling device, the adhesive cutting device and the adhesive cutting heating device on the basis of the original semi-automatic stretch wrapping machine, so that the tray stretch wrapping machine is upgraded from semi-automatic packaging to full-automatic packaging. The packaging efficiency is improved, manual film feeding and film cutting are not needed, manpower is saved, and full-automatic unmanned operation is realized.

[0005] The existing wrapping film packing machine usually has an automatic film feeding and cutting structure to realize automation, but the existing technology cannot guarantee that the cut end of the packing film is stably adhered to the second-to-last circle of the packing film, thereby forming a flash, which leads to loose packing or affects subsequent transportation. SUMMARY

[0006] To solve the foregoing problems, the present application provides an automatic film feeding and cutting method and device of a wrapping film packing machine, which provides an implementation mode of automatically realizing film feeding and cutting, and can automatically realize film feeding and cutting of the packing film. The end of the packing film can be stably adhered to the second-to-last circle of the packing film. The technical solution is as follows:

[0007] In one aspect, the embodiment of the present application provides a method for automatic film winding and film cutting of a wrapping film packaging machine, which comprises: when the wrapping film packaging machine is packaging, the lifting plate 5 is at a low position, the film cutting mechanism 6 is horizontally arranged, and the film clamping ring 44 of the film winding structure 4 is horizontally arranged to clamp the starting end of the wrapping film 3; the film frame of the wrapping machine moves up and down and rotates around the product 2; when the film frame moves downward to the lower part of the product 2, the wrapping film 3 is wrapped outside the starting end, the film clamping ring 44 moves backward and away from each other to release the starting end, and the air blowing pipe 7 blows air to enable the starting end to be separated from the film winding structure 4; when the wrapping film 3 is wound downward to the penultimate circle, the lifting plate 5 is lifted, and the wrapping film 3 is wound around the outer side of the lifting plate 5; after the film frame rotates around the film winding structure 4, the film winding structure 4 is rotated to be vertical and located outside the wrapping film 3; when the wrapping film 3 is wound to the last circle, the film frame stops after rotating around the film winding structure 4, the film clamping ring 44 moves downward and approaches each other to clamp the wrapping film 3 as the starting end for the next packaging; at this time, the starting end for the next packaging is inclined downward and outward relative to the lifting plate 5; the film cutting mechanism 6 is rotated to be vertical, the clamping plate 62 on the film cutting mechanism 6 presses the last circle of the wrapping film 3 and the penultimate circle of the wrapping film 3 together outside the lifting plate 5, the heating plate 63 on the film cutting mechanism 6 is located on the adjacent outside of the wrapping film 3, and the heating wire 64 on the film cutting mechanism 6 is pressed on the outside of the last circle of the wrapping film 3 to cut the wrapping film 3 to form an end; at this time, the heating plate 63 and the heating wire 64 are heated, the heating plate 63 blows air inward to avoid the wrapping film 3 from approaching and tensioning the wrapping film 3 inward; after the wrapping film 3 is cut, the end of the wrapping film 3 moves inward and adheres to the penultimate circle of the wrapping film 3, the film cutting mechanism 6 is first rotated to be horizontal, the lifting plate 5 is lowered again, the lower side of the wrapping film 3 abuts against the baffle 8 on the adjacent outside of the lifting plate 5, and the wrapping film 3 moves inward due to the rebound force; at the same time, the film winding structure 4 is rotated to be horizontal.

[0008] In another aspect, the present application also provides an automatic film feeding and cutting device for a film wrapping machine, which comprises a frame 1, a film cutting structure at the front of the frame 1, and a film feeding structure 4 on the frame 1 and behind the film cutting structure, wherein the frame 1 is located at the left or right side of a product 2; the film cutting structure comprises a lifting plate 5 arranged in the front-rear direction and a turnover film cutting mechanism 6 outside the lifting plate 5; the lifting plate 5 is located below the product 2 and can move upward, and is located at the adjacent outside of the front of the product 2; the turnover film cutting mechanism 6 comprises a turnover arm 61 arranged in the left-right direction and a clamping plate 62, a heating plate 63 and a heating wire 64 arranged in sequence from front to back on the turnover arm 61, wherein the clamping plate 62, the heating plate 63 and the heating wire 64 are all arranged in the left-right direction, the turnover arm 61 can be turned inward to be vertical, the clamping plate 62 is arranged opposite to the lifting plate 5, and the heating wire 64 is located behind the lifting plate 5 and in front of the film feeding structure 4; when the turnover arm 61 is vertical, the last turn of wrapping film 3 is clamped by the film feeding structure 4, the clamping plate 62 presses the last turn of wrapping film 3 and the second last turn of wrapping film 3 together on the lifting plate 5; the heating plate 63 is located at the adjacent outside of the last turn of wrapping film 3 and blows air inward; the heating wire 64 abuts against the outside of the last turn of wrapping film 3 to cut the wrapping film 3; the heating plate 63 and the heating wire 64 can both generate heat; the film feeding structure 4 is arranged in the front-rear direction, is located below the product 2, is located directly behind the lifting plate 5, can be turned forward to be vertical, and has a plurality of film clamping rings 44 arranged in front of and behind each other thereon; when the film feeding structure 4 is turned to be vertical, the film clamping rings 44 can move downward and approach each other synchronously to clamp the wrapping film 3.

[0009] Preferably, a blowing pipe 7 is arranged at the rear of the frame 1 and above the inside of the film feeding structure 4, wherein the blowing pipe 7 is arranged in the front-rear direction and has air holes on the outside thereof; when the film feeding structure 4 clamps the starting end of the wrapping film 3, the first turn of wrapping film 3 abuts against the outside of the blowing pipe 7.

[0010] Further, two support rods 65 are arranged side by side on the turnover arm 61 in the left-right direction, wherein the support rods 65 are arranged in the front-rear direction, the heating plate 63 is arranged on the upper side of the two support rods 65 and opposite to the rear of the lifting plate 5, the rear end of the support rod 65 is located behind the heating plate 63, and a rotating bracket 66 is rotatably arranged on the rear end of the support rod 65, wherein the rotating bracket 66 is perpendicular to the corresponding support rod 65, the distance between the two rotating brackets 66 gradually approaches from top to bottom to form a figure-eight structure, the heating wire 64 is arranged between the upper ends of the two rotating brackets 66, and a tension spring is arranged between the lower ends of the two rotating brackets 66.

[0011] Further, the lower side of the clamping plate 62 in the embodiment of the present application is provided with two guide rods 67 in parallel, the guide rods 67 are vertically arranged and the lower end of the guide rods 67 is provided with a limiting ring; the front end of the support rod 65 is located in front of the heating plate 63 and the support rod 65 is provided with a sliding sleeve; the two guide rods 67 are respectively and slidingly arranged on the two sliding sleeves and the guide rods 67 are respectively provided with a spring 68; the spring 68 is located between the lower side of the clamping plate 62 and the upper side of the sliding sleeve and the limiting ring is in abutment with the lower side of the sliding sleeve.

[0012] Further, the upper side of the heating plate 63 in the embodiment of the present application is provided with a plurality of strip-shaped air holes in parallel, the strip-shaped air holes are arranged along the left-right direction.

[0013] Preferably, the outer side of the film clamping ring 44 in the embodiment of the present application is located at the outer side of the lifting plate 5, so that the last circle of the packing film 3 is obliquely arranged outward from the lifting plate 5 to the upper die structure 4; when the film breaking mechanism 6 is vertically arranged, the clamping plate 62, the heating plate 63 and the heating wire 64 are all vertically arranged, and the heating wire 64 and the heating plate 63 are located at the outer side of the clamping plate 62.

[0014] Further, the upper die structure 4 in the embodiment of the present application comprises a turnover seat 41 which is arranged along the front-rear direction and can be turned to be vertical, a sliding frame 42 at the rear side of the turnover seat 41, a clamping cylinder 43 at the front side of the turnover seat 41 and a plurality of film clamping rings 44 which are arranged on the sliding frame 42 in front-rear direction; the turnover seat 41 is rotationally arranged at the front of the rack 1, the sliding frame 42 and the clamping cylinder 43 are both arranged along the front-rear direction, and the film clamping ring 44 is a circular ring which is coaxially arranged with the clamping cylinder 43; the sliding frame 42 comprises two sliding rods which are arranged in parallel and a connecting rod between the rear ends of the two sliding rods; the film clamping ring 44 at the front end is fixed at the front end of the sliding rod, and the remaining film clamping rings 44 are slidingly arranged on the two sliding rods; the telescopic rod of the clamping cylinder 43 penetrates through the turnover seat 41 and the film clamping ring 44 at the rear side and is fixedly connected with the center of the last film clamping ring 44, and a limiting tension spring, a limiting rope or a limiting sliding rod is arranged between two adjacent film clamping rings 44; when the clamping cylinder 43 is extended, the film clamping rings 44 are away from each other; when the clamping cylinder 43 is retracted, the film clamping rings 44 are close to each other.

[0015] Further, the rack 1 in the embodiment of the present application is provided with a baffle 8; the baffle 8 is an L-shaped structure, which is located below the adjacent last circle of the packing film 3, the longitudinal arm of the baffle 8 is arranged along the front-rear direction and is located at the outer side of the lifting plate 5, and the transverse arm of the baffle 8 is located at the inner side of the rear end of the longitudinal arm and is located below the lifting plate 5; when the lifting plate 5 is lowered, the lower side of the packing film 3 at the outer side of the lifting plate 5 is in abutment with the baffle 8.

[0016] Specifically, the lifting plate 5 in the embodiment of the present application is a plastic plate with a width greater than 3 cm; the clamping plate 62 is a metal plate, which is arranged opposite to the front of the lifting plate 5, the two ends of the clamping plate 62 are bevelled, and the width of the clamping plate 62 is less than 1 cm.

[0017] The technical scheme provided by the embodiment of the present application has the beneficial effects that the embodiment of the present application provides an automatic film feeding and film cutting method and device of a wrapping film packing machine, and the film feeding and cutting of the packing film can be automatically realized, and the end of the packing film can be stably adhered to the second last circle of the packing film, thereby avoiding the formation of burrs. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a structural schematic diagram of the automatic film feeding and film cutting device of the wrapping film packing machine provided by the embodiment of the present application when the film feeding structure clamps the packing film;

[0019] Figure 2 FIG. 2 is a structural schematic diagram of the automatic film feeding and film cutting device of the wrapping film packing machine provided by the embodiment of the present application when the film feeding structure releases the packing film;

[0020] Figure 3 FIG. 3 is a structural schematic diagram of the combination of the film feeding structure and the film cutting structure when the packing film is cut.

[0021] In the figure: 1 is a machine frame, 2 is a product, 3 is a packing film, 4 is a film feeding structure, 5 is a lifting plate, 6 is a turnover film cutting mechanism, 7 is a blowing pipe, and 8 is a baffle.

[0022] 41 is a turnover seat, 42 is a sliding frame, 43 is a clamping cylinder, and 44 is a film clamping ring.

[0023] 61 is a turnover arm, 62 is a clamping plate, 63 is a heating plate, 64 is a heating wire, 65 is a supporting rod, 66 is a rotating support, 67 is a guide rod, and 68 is a spring. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings.

[0025] Embodiment 1

[0026] In order to facilitate the description, the product 2 is defined to be arranged in the front-rear direction, and the product 2 is input from the front side of the wrapping film packing machine, and after the packing is completed, the product 2 is output to the rear.

[0027] Referring to Figures 1-3 Embodiment 1 provides an automatic film feeding and film cutting device of a wrapping film packing machine, which comprises a machine frame 1, a film cutting structure at the front of the machine frame 1, and a film feeding structure 4 on the machine frame 1 and located behind the film cutting structure.

[0028] The film breaking structure comprises a lifting plate 5 arranged along the front-rear direction and a film turning and breaking mechanism 6 arranged outside the lifting plate 5. The lifting plate 5 is arranged below the product 2 and can move upward. The lifting plate 5 is arranged adjacent to the front of the product 2 and can move up and down by a corresponding structure. The film turning and breaking mechanism 6 comprises a turning arm 61 arranged along the left-right direction and a clamping plate 62, a heating plate 63 and a heating wire 64 arranged in sequence from front to back on the turning arm 61. The clamping plate 62, the heating plate 63 and the heating wire 64 are all arranged along the left-right direction. When the turning arm 61 is turned to be vertical, the clamping plate 62, the heating plate 63 and the heating wire 64 are all arranged vertically. The turning arm 61 can be turned inward to be vertical by a corresponding structure such as a pneumatic cylinder. The clamping plate 62 is arranged opposite to the lifting plate 5. The heating wire 64 is arranged behind the lifting plate 5 and in front of the upper film structure 4. When the turning arm 61 is vertical, the last turn of the packaging film 3 is clamped by the upper film structure 4. The clamping plate 62 presses the last turn of the packaging film 3 and the second last turn of the packaging film 3 together on the lifting plate 5. The heating plate 63 is arranged adjacent to the outside of the last turn of the packaging film 3 and blows air inward (while heating). The heating wire 64 is arranged on the outside of the last turn of the packaging film 3 to cut the packaging film 3. The heating plate 63 and the heating wire 64 can both heat.

[0029] The upper film structure 4 is arranged along the front-rear direction, below the product 2 and behind the lifting plate 5. The upper film structure 4 can be turned forward to be vertical by a corresponding structure such as a pneumatic cylinder. A plurality of film clamping rings 44 are arranged on the upper film structure 4 in front of and behind each other. The film clamping rings 44 can move forward and backward and are driven by a corresponding structure to move close to and away from each other. When the upper film structure 4 is turned to be vertical, the film clamping rings 44 can move downward and close to each other to clamp the packaging film 3. When the packaging film 3 is released, the film clamping rings 44 move away from each other.

[0030] Preferably, referring to Figures 1-2 , a blowing pipe 7 is arranged on the rear of the rack 1 and above the inside of the upper film structure 4. The blowing pipe 7 is arranged along the front-rear direction and has air holes (specifically a plurality of round holes arranged side by side in front of and behind each other) on the outside. When the upper film structure 4 clamps the starting end of the packaging film 3, the first turn of the packaging film 3 abuts against the outside of the blowing pipe 7. The blowing pipe 7 moves the starting end outward, thereby ensuring that the starting end is separated from the upper film structure 4.

[0031] Further, referring to Figures 1-3In this embodiment of the invention, two support rods 65 are arranged side by side on the flipping arm 61, with the support rods 65 arranged in the front-to-back direction. The heating plate 63 is located on the upper side of the two support rods 65 and is positioned directly opposite the rear of the lifting plate 5. The rear end of the support rod 65 is located behind the heating plate 63, and two rotating brackets 66 are rotatably mounted on it. The rotating brackets 66 are perpendicular to the corresponding support rods 65, and the distance between the two rotating brackets 66 gradually decreases from top to bottom, forming a figure-eight structure. The heating wire 64 is located between the upper ends of the two rotating brackets 66, and a tension spring (arranged in the left-to-right direction) is located between the lower ends of the two rotating brackets 66. When the packing film 3 is cut, the aforementioned structure allows the heating wire 64 to move slightly outward to cooperate with the taut packing film 3 (which has a certain degree of elasticity).

[0032] Further, see Figures 1-3 In this embodiment of the invention, two guide rods 67 are arranged side by side on the lower side of the clamping plate 62. The guide rods 67 are vertically arranged and have a limiting ring at their lower end. The front end of the support rod 65 is located in front of the heating plate 63 and has a sliding sleeve (specifically a vertically arranged circular sleeve) on it. The two guide rods 67 are slidably mounted on the two sliding sleeves, and each of them is fitted with a spring 68 (vertically arranged). The spring 68 is located between the lower side of the clamping plate 62 and the upper side of the sliding sleeve, and the limiting ring rests against the lower side of the sliding sleeve. The aforementioned structure ensures that the clamping plate 62 presses the packaging film 3 tightly.

[0033] In this embodiment of the invention, the heating plate 63 has multiple (specifically two) strip-shaped air holes arranged side by side on the upper side, with the strip-shaped air holes arranged in the left-right direction.

[0034] Preferably, see Figure 3 In this embodiment of the invention, the outer side of the clamping ring 44 is located outside the lifting plate 5. The last ring of packing film 3 from the lifting plate 5 to the upper mold structure 4 is angled outwards, while the penultimate ring of packing film 3 is angled inwards. This ensures that the heating wire 64 only cuts the last ring of packing film 3, while simultaneously providing elastic force for the end of the packing film 3 (which springs back after being cut) to move forward and inwards. When the flipping film-cutting mechanism 6 is vertical, both the heating wire 64 and the heating plate 63 are located outside the clamping plate 62.

[0035] Among them, see Figures 1-2The upper die structure 4 in the embodiment of the present application comprises a turnover seat 41 (hollow tubular structure) arranged along the front-rear direction and capable of being turned to vertical, a sliding frame 42 at the rear side of the turnover seat 41, a clamping cylinder 43 at the front side of the turnover seat 41, and a plurality of film clamping rings 44 arranged at intervals on the sliding frame 42. The turnover seat 4 is arranged at the front of the rack 1 and is turned by a corresponding structure (such as a cylinder). The sliding frame 42 and the clamping cylinder 43 are arranged along the front-rear direction, and the film clamping ring 44 is a coaxially arranged ring (non-sharp structure, which ensures that the packaging film 3 is more easily separated). The sliding frame 42 comprises two sliding rods arranged side by side (arranged along the front-rear direction) and a connecting rod between the rear ends thereof, etc. The film clamping ring 44 at the front end is fixed to the front end of the sliding rod, and the remaining film clamping rings 44 are slidingly arranged on the two sliding rods. The extension rod of the clamping cylinder 43 passes through the turnover seat 41 and the film clamping ring 44 rearward and is fixedly connected to the center of the last film clamping ring 44. Limiting springs, limiting ropes or limiting sliding rods are arranged between adjacent two film clamping rings 44. The limiting springs, limiting ropes or limiting sliding rods can ensure that the film clamping rings 44 are synchronously close to or away from each other and limit the distance between adjacent two film clamping rings 44 (which can be 1-2 cm). In order to ensure the stability of the operation of the film clamping ring 44, the number of limiting springs, limiting ropes or limiting sliding rods is two and is respectively located at the two sides of the film clamping ring 44. When the clamping cylinder 43 is extended, the film clamping rings 44 are away from each other; when the clamping cylinder 43 is retracted, the film clamping rings 44 are close to each other. Taking the limiting rope as an example, when the clamping cylinder 43 is extended, the limiting rope is tightened.

[0036] Further, the rack 1 in the embodiment of the present application is provided with a baffle 8. The baffle 8 is an L-shaped structure, which is located adjacent below the last circle of the packaging film 3, which is located at the inner side of the film breaking mechanism 6, which is arranged along the front-rear direction and is located adjacent to the outer side of the lifting plate 5, and which is located at the inner side of the rear end of the longitudinal arm and is located adjacent to the rear of the lifting plate 5. When the lifting plate 5 is lowered, the lower side of the packaging film 3 on the outer side thereof abuts against the baffle 8, so as to avoid the downward movement of the packaging film 3 and also to avoid the adhesion of the packaging film 3 to the lifting plate 5. The baffle 8 can also be a square-shaped structure arranged along the front-rear direction, and the four sides thereof are respectively located adjacent to the outer side of the corresponding side of the lifting plate 5.

[0037] Specifically, the lifting plate 5 in the embodiment of the present application is a plastic plate with a width greater than 3 cm. The clamping plate 62 is a metal plate, which is arranged opposite to the front of the lifting plate 5, and the two ends thereof are bevel angles, and the width thereof is less than 1 cm. The clamping plate 62 is to avoid the adhesion of the packaging film 3 thereto.

[0038] Embodiment 2

[0039] Referring to Figures 1-3 Embodiment 2 provides a method for automatically feeding and breaking film of a wrapping film packaging machine, which adopts the automatic film feeding and breaking device of the wrapping film packaging machine disclosed in embodiment 1, and the method comprises the following steps.

[0040] When the wrapping film packing machine is packing, the lifting plate 5 is at the low position, the film turning-off mechanism 6 is horizontally arranged, and the film clamping ring 44 on the upper film structure 4 clamps the starting end of the wrapping film 3. The film frame on the wrapping machine moves up and down and rotates around the product 2. Specifically, the film frame moves up to the top of the product 2 from the bottom of the product 2, and then moves down to the bottom of the product 2.

[0041] When the film frame moves down to the lower part of the product 2, the wrapping film 3 covers the starting end, the film clamping ring 44 moves backward and away from each other to release the starting end, and the air blowing pipe 7 blows air to make the starting end separate from the upper film structure 4.

[0042] When the wrapping film 3 is wrapped down to the second last circle, the lifting plate 5 rises, and the wrapping film 3 passes outside the lifting plate 5. After the film frame passes the upper film structure 4, the film frame rotates at a reduced speed (the tension of the wrapping film 3 output by the film frame can be controlled at the same time, so that the last circle of the wrapping film 3 is tensioned), and the upper film structure 4 is turned to vertical and located outside the wrapping film 3.

[0043] When the wrapping film 3 is wrapped to the last circle, the film frame stops after passing the upper film structure 4, the film clamping ring 44 moves downward and approaches each other to clamp the wrapping film 3 as the starting end for the next packing. At this time, the starting end for the next packing is inclined downward and outward relative to the lifting plate 5, so as to facilitate cutting. The film turning-off mechanism 6 is turned to vertical, the clamping plate 62 on the film turning-off mechanism 6 presses the last circle of the wrapping film 3 and the second last circle of the wrapping film 3 together outside the lifting plate 5, the heating plate 63 on the film turning-off mechanism 6 is located on the adjacent outside of the wrapping film 3, and the heating wire 64 on the film turning-off mechanism 6 is pressed on the outside of the last circle of the wrapping film 3 to cut the wrapping film 3 to form the end. At this time, the heating plate 63 and the heating wire 64 are heated, the heating plate 63 blows air inward to avoid the wrapping film 3 approaching and tensioning the wrapping film 3 inward. The heated wrapping film 3 is more easily rebounded and more easily adhered to the second circle of the wrapping film 3, so as to ensure that the end of the wrapping film 3 is stably adhered to the second circle of the wrapping film 3.

[0044] After the wrapping film 3 is cut, the end of the wrapping film 3 moves inward and adheres to the second last circle of the wrapping film 3, the film turning-off mechanism 6 is first turned to horizontal, the lifting plate 5 is then lowered, the lower side of the wrapping film 3 abuts against the baffle 8 on the adjacent outside of the lifting plate 5, and the wrapping film 3 outside the lifting plate 5 moves inward due to the rebounding force to adhere to the outside of the product 2. At the same time, the upper film structure 4 is turned to horizontal.

[0045] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An automatic film feeding and cutting device of a wrapping film packaging machine, comprising a frame (1), a film cutting structure at the front of the frame (1), and a film feeding structure (4) on the frame (1) and behind the film cutting structure, the frame (1) being located on the left or right side of a product (2); the film cutting structure comprises a lifting plate (5) arranged in the front-rear direction and a turnover film cutting mechanism (6) outside the lifting plate (5); the lifting plate (5) is located below the product (2) and can move upward, and is located on the adjacent outside of the front of the product (2); the turnover film cutting mechanism (6) comprises a turnover arm (61) arranged in the left-right direction and a clamping plate (62), a heating plate (63) and a heating wire (64) arranged in sequence from front to back on the turnover arm (61); the clamping plate (62), the heating plate (63) and the heating wire (64) are all arranged in the left-right direction; the turnover arm (61) can be inwardly turned to vertical; the clamping plate (62) is arranged opposite to the lifting plate (5); the heating wire (64) is located behind the lifting plate (5) and in front of the film feeding structure (4); when the turnover arm (61) is vertical, the last turn of wrapping film (3) is clamped by the film feeding structure (4); the clamping plate (62) presses the last turn of wrapping film (3) and the second last turn of wrapping film (3) together on the lifting plate (5); the heating plate (63) is located on the adjacent outside of the last turn of wrapping film (3) and blows inward; the heating wire (64) abuts against the outside of the last turn of wrapping film (3) to cut the wrapping film (3); the heating plate (63) and the heating wire (64) can both heat; the film feeding structure (4) is arranged in the front-rear direction, is located below the product (2), is located directly behind the lifting plate (5), can be turned forward to vertical, and has a plurality of film clamping rings (44) arranged in front of and behind; when the film feeding structure (4) is turned to vertical, the film clamping rings (44) can move downward and approach each other to clamp the wrapping film (3); two support rods (65) are arranged side by side on the turnover arm (61) in the left-right direction; the support rods (65) are arranged in the front-rear direction; the heating plate (63) is arranged on the upper side of the two support rods (65) and opposite to the rear part of the lifting plate (5); the rear ends of the support rods (65) are located behind the heating plate (63) and have rotary supports (66) rotatably arranged thereon; the rotary supports (66) are perpendicular to the corresponding support rods (65); the distance between the two rotary supports (66) gradually approaches from top to bottom to form a figure-of-eight structure; the heating wire (64) is arranged between the upper ends of the two rotary supports (66); a tension spring is arranged between the lower ends of the two rotary supports (66). The lower side of the clamping plate (62) is provided with two guide rods (67) side by side, the guide rods (67) are vertically arranged and the lower ends of the guide rods (67) are provided with limiting rings; the front end of the supporting rod (65) is located in front of the heating plate (63) and the supporting rod (65) is provided with a sliding sleeve on the upper end; the two guide rods (67) are respectively slidably arranged on the two sliding sleeves and the two sliding sleeves are respectively provided with springs (68); the springs (68) are located between the lower side of the clamping plate (62) and the upper side of the sliding sleeve, and the limiting rings abut against the lower side of the sliding sleeve; The upper side of the heating plate (63) is provided with a plurality of strip-shaped air holes side by side, and the strip-shaped air holes are arranged along the left-right direction; The outer side of the film clamping ring (44) is located on the outer side of the lifting plate (5), and the last circle of the packing film (3) from the lifting plate (5) to the upper die structure (4) is arranged obliquely outward; when the film breaking mechanism (6) is vertical, the clamping plate (62), the heating plate (63) and the heating wire (64) are all vertically arranged, and the heating wire (64) and the heating plate (63) are both located on the outer side of the clamping plate (62); The rack (1) is provided with a baffle (8); the baffle (8) is an L-shaped structure, which is located adjacent to the lower side of the last circle of the packing film (3), the longitudinal arm of the baffle (8) is arranged along the front-rear direction and located adjacent to the outer side of the lifting plate (5), and the transverse arm of the baffle (8) is located on the inner side of the rear end of the longitudinal arm and adjacent to the rear side of the lifting plate (5); when the lifting plate (5) is lowered, the lower side of the packing film (3) on the outer side of the lifting plate (5) abuts against the baffle (8); The method for automatically feeding and breaking the film of the winding film packing machine comprises the following steps: When the winding film packing machine is packing, the lifting plate (5) is located at a low position, the film breaking mechanism (6) is horizontally arranged, the film feeding structure (4) is horizontally arranged, and the film clamping ring (44) on the film feeding structure (4) clamps the starting end of the packing film (3); the film rack of the winding machine moves up and down and rotates around the product (2); When the film rack moves downward to the lower part of the product (2), the packing film (3) is wrapped outside the starting end, the film clamping ring (44) moves backward and moves away from each other to release the starting end, and the air blowing pipe (7) blows air to enable the starting end to be separated from the film feeding structure (4); When the packing film (3) is wound downward to the second last circle, the lifting plate (5) is raised, the packing film (3) passes around the outer side of the lifting plate (5), the film rack rotates at a reduced speed after passing around the film feeding structure (4), and the film feeding structure (4) is turned to be vertical and located on the outer side of the packing film (3); When the wrapping film (3) is wound to the last turn, the film frame stops after passing the upper mold structure (4), the film clamping ring (44) moves downward and closes to each other to clamp the wrapping film (3) as the starting end of the next wrapping; at this time, the starting end of the next wrapping is inclined downward and outward relative to the lifting plate (5); the turnover film cutting mechanism (6) is turned to vertical, the clamping plate (62) on it presses the last turn of wrapping film (3) and the second last turn of wrapping film (3) together on the outside of the lifting plate (5), the heating plate (63) on it is located on the adjacent outside of the wrapping film (3), and the heating wire (64) on it is pressed on the outside of the last turn of wrapping film (3) to cut the wrapping film (3) to form the end; at this time, the heating plate (63) and the heating wire (64) are heated, the heating plate (63) blows inward to avoid the wrapping film (3) and tightens the wrapping film (3) inward; After the wrapping film (3) is cut, the end of the wrapping film (3) moves inward and adheres to the second last turn of wrapping film (3), the turnover film cutting mechanism (6) is first turned to horizontal, and then the lifting plate (5) is lowered, the lower side of the wrapping film (3) abuts against the baffle (8) on the adjacent outside of the lifting plate (5), and the wrapping film (3) moves inward due to the rebound force; at the same time, the upper mold structure (4) is turned to horizontal.

2. The automatic film feeding and film cutting apparatus of a wrapping film packer according to claim 1, wherein The rear of the frame (1) and above the inner side of the upper mold structure (4) is provided with a blowing pipe (7), which is arranged in front and back and has air holes on the outer side; when the upper mold structure (4) clamps the starting end of the wrapping film (3), the first turn of wrapping film (3) abuts against the outer side of the blowing pipe (7).

3. The automatic film feeding and film cutting apparatus of a wrapping film packer according to claim 1, wherein The upper mold structure (4) includes a turnover seat (41) arranged in front and back and capable of being turned to vertical, a sliding frame (42) on the rear side of the turnover seat (41), a clamping cylinder (43) on the front side of the turnover seat (41), and a plurality of film clamping rings (44) arranged in front and back on the sliding frame (42); the turnover seat (41) is rotatably arranged on the front of the frame (1), the sliding frame (42) and the clamping cylinder (43) are arranged in front and back, and the film clamping ring (44) is a coaxial circular ring with the clamping cylinder (43); the sliding frame (42) includes two sliding rods arranged side by side and a connecting rod between the rear ends of the two sliding rods; the film clamping ring (44) at the front end is fixed on the front end of the sliding rod, and the remaining film clamping rings (44) are slidably arranged on the two sliding rods; the extension rod of the clamping cylinder (43) passes through the turnover seat (41) and the film clamping ring (44) and is fixedly connected with the center of the last film clamping ring (44) on the rear side; a limiting tension spring, a limiting rope or a limiting sliding rod is arranged between the adjacent two film clamping rings (44); when the clamping cylinder (43) is extended, the film clamping rings (44) are away from each other; when the clamping cylinder (43) is retracted, the film clamping rings (44) are close to each other.

4. The automatic film feeding and film cutting apparatus of a wrapping film packer according to claim 1, wherein The lifting plate (5) is a plastic plate with a width greater than 3cm; the clamping plate (62) is a metal plate arranged opposite to the front of the lifting plate (5), and the two ends are bevel angles, and the width is less than 1cm.

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