Automatic film sealing equipment for plastic bottle mouth and its working principle

Abstract

The present invention discloses an automatic film-sealing device for the mouth of a plastic bottle and its working principle. The device includes a machine and a control circuit. The machine is provided with a turntable, and four groups of heat-sealing heads are evenly distributed around its rotation center on the turntable. The heat-sealing heads are electrically connected to the control circuit. The machine is provided with a film-cutting mechanism for cutting out a sealing film from an aluminum-plastic composite film, a film-loading mechanism for moving the sealing film to the heat-sealing head, a bottle-releasing mechanism for inserting the plastic bottle into the heat-sealing head with the sealing film, a bottle-pressing mechanism for applying pressure to the plastic bottle on the heat-sealing head, and a bottle-removing mechanism for removing the plastic bottle from the heat-sealing head. The turntable drives the heat-sealing head to the film-loading mechanism, the bottle-releasing mechanism, the bottle-pressing mechanism, and the bottle-removing mechanism in sequence for processing. This device can automatically complete the automatic film sealing of the mouth of the plastic bottle, has high production efficiency, good sealing effect, safety and reliability, can improve sealing quality while saving labor costs, and can replace manual film-sealing processes.

Description

Technical Field

[0001] The invention relates to the technical field of film sealing machines, in particular to automatic film sealing equipment for the mouth of a plastic bottle and its working principle. Background Art

[0002] Current glue bottles, such as those containing glass glue, consist of a bottle body with a closed spout at one end and an open end for receiving a pusher piston. When glass glue is poured into the bottle, the tension of the glue tends to seal the inner end of the spout, creating a closed air cavity within the bottle. The air within this cavity can cause the glass glue near the inner end of the spout to oxidize and dry out. To address this issue, some glass glue bottles currently use a hot-melt process to apply aluminum-plastic composite film to the inside of the bottle to seal the inner end of the spout. This hot-melt application of aluminum-plastic composite film is a manual process involving an electrically heated sealing head that penetrates the top of the bottle. The worker places the cut aluminum-plastic composite film on top of the sealing head, then inserts the bottle into the head. Pressure is applied to the bottle from above, and the electrically heated sealing head activates to seal the film. Finally, the bottle, sealed with the aluminum-plastic composite film, is removed, completing the sealing process. Summary of the Invention

[0003] The purpose of the present invention is to provide an automatic film sealing device for plastic bottle mouths with reasonable structure and high production efficiency and its working principle.

[0004] The object of the present invention is achieved like this:

[0005] An automatic film-sealing device for the mouth of a plastic bottle comprises a machine and a control circuit. The machine is provided with a turntable on which four groups of heat-sealing heads are evenly distributed around its rotation center, and the heat-sealing heads are electrically connected to the control circuit. A film-cutting mechanism for cutting a sealing film from an aluminum-plastic composite film, a film-loading mechanism for moving the sealing film to the heat-sealing head, a bottle-releasing mechanism for putting a plastic bottle onto the heat-sealing head with the sealing film, a bottle-pressing mechanism for applying pressure to the plastic bottle on the heat-sealing head, and a bottle-removing mechanism for removing the plastic bottle from the heat-sealing head are provided along a transfer track of the heat-sealing head. The turntable drives the heat-sealing head to the film-loading mechanism, the bottle-releasing mechanism, the bottle-pressing mechanism and the bottle-removing mechanism for processing in sequence.

[0006] The purpose of the present invention can also be solved by the following technical measures:

[0007] As a more specific solution, the film loading mechanism is located above the film cutting mechanism. The film cutting mechanism includes a unwinding device for installing the aluminum-plastic composite film roll and unwinding it, a film cutting device for cutting the sealing film, and a winding device for recovering the aluminum-plastic composite film after the sealing film is cut off. The aluminum-plastic composite film is tensioned and connected between the unwinding device and the winding device.

[0008] As a further solution, the film cutting device includes a film cutting head and a cutting drive device that controls the film cutting head to enter the aluminum-plastic composite film and cut the sealing film. The film cutting head and the film loading mechanism are respectively located below and above the aluminum-plastic composite film between the unwinding device and the rewinding device. Alternatively, the film cutting device includes a film punching head, a cutting template, and a punching head lifting and driving cylinder. The film punching head and the cutting template are respectively located below and above the aluminum-plastic composite film between the unwinding device and the rewinding device. The film loading mechanism is located above the cutting template. The cutting template is provided with a cutting cavity extending through the upper and lower sides of the punching head corresponding to the punching head. The punching head lifting and driving cylinder is disposed on the machine platform and is used to control the lifting and lowering movement of the film punching head.

[0009] As a further solution, the film loading mechanism includes a fixed supporting part, a transverse film moving cylinder, a movable supporting platform, a longitudinal film moving cylinder and a suction cup; the fixed supporting part is fixedly arranged on the machine platform and is located above the aluminum-plastic composite film and extends above the turntable, and the suction cup is arranged below the movable supporting platform and is connected to the first negative pressure air path.

[0010] As a further solution, the fixed supporting member is a fixed support, and the fixed support is provided with a clearance hole corresponding to the upper part of the aluminum-plastic composite film and the upper part of the turntable. The movable support is arranged on the fixed support for transverse sliding. The transverse film transfer cylinder is arranged between the fixed support and the movable support, and drives the movable support to move in the area between the upper part of the aluminum-plastic composite film and the upper part of the turntable. The longitudinal film transfer cylinder is arranged on the movable support and connected to the suction cup. The suction cup corresponds to the upper part of the inner side of the film cutting head. Alternatively, the fixed supporting member is a cantilever beam, and the two ends of the cantilever beam are respectively located above the aluminum-plastic composite film and above the turntable, and are staggered with the vertical area of ​​the film punching head. The transverse film transfer cylinder is arranged between the cantilever beam and the movable support, and drives the movable support to move in the area between the upper part of the aluminum-plastic composite film and the upper part of the turntable. The longitudinal film transfer cylinder is linearly slidably matched with the cantilever beam and is transmission-connected to the movable support. The suction cup corresponds to the center of the film punching head.

[0011] As a further solution, the heat sealing head includes an insertion rod and an annular heating element, the annular heating element is arranged at the top end of the insertion rod, and the annular heating element is electrically connected to the control circuit.

[0012] As a further solution, the top of the insertion rod is provided with an elastic protrusion corresponding to the periphery of the annular heating element, and the inner side of the elastic protrusion forms a limiting groove, and the sealing film is placed in the limiting groove. Alternatively, the top of the insertion rod is provided with an air intake port corresponding to the inner side of the annular heating element, and a suction fan is provided inside the insertion rod, the suction end of the suction fan is connected to the air intake port, the suction fan is electrically connected to the control circuit through a conductive ring, and the sealing film is placed on the top of the insertion rod. Alternatively, a floating suction head is provided at the center of the top of the insertion rod, the floating suction head is supported on the insertion rod through an elastic part, the top of the floating suction head is provided with an air intake port, and the center of the top surface of the turntable is provided with a rotary air distribution joint, and the air intake port is connected to the second negative pressure air path through the rotary air distribution joint.

[0013] As a further solution, the bottle placing mechanism includes a bottle conveying device and a bottle turning device. The bottle conveying device conveys the plastic bottle to the bottle turning device. The bottle turning device turns the plastic bottle to a vertical state and puts the plastic bottle onto a heat sealing head with a sealing film.

[0014] As a further solution, the bottle pressing mechanism includes a first fixed frame, a bottle pressing cylinder and a pressing block. The first fixed frame is fixedly set on the machine platform and suspended above the turntable; the pressing block is located above the motion trajectory of the heat sealing head and is transmission-connected to the bottle pressing cylinder. The bottle pressing cylinder is set on the first fixed frame.

[0015] As a further solution, the bottle picking mechanism includes a second fixed frame, a movable frame, a bottle moving power unit and a lifting device for clamping the plastic bottle. The second fixed frame is fixedly set on the machine platform, and one end of the second fixed frame is suspended above the turntable. The movable frame is slidably set on the second fixed frame. The bottle moving power unit is connected between the second fixed frame and the movable frame, and controls the movable frame to move between above the machine platform and above the turntable. The lifting device is set on the movable frame.

[0016] As a further solution, the suction cup is made of elastic material.

[0017] The working principle of an automatic film sealing device for plastic bottles is as follows:

[0018] S1. The bottle conveyor conveys the plastic bottle, the unwinding device and the rewinding device convey the aluminum-plastic composite film, the aluminum-plastic composite film passes through the area between the film loading mechanism and the film cutting device, and the longitudinal film transfer cylinder drives the suction cup to move, the suction cup presses the aluminum-plastic composite film and fixes the aluminum-plastic composite film;

[0019] S2. The cutting drive drives the film cutting head to move upward and rotate axially. After piercing the aluminum-plastic composite film, the film cutting head rotates to cut out the sealing film. Alternatively, the film punching head pushes the aluminum-plastic composite film into the cutting cavity of the cutting template to cut out the sealing film. The suction cup is compressed and deformed upward by the film punching head; finally, the suction cup sucks up the sealing film.

[0020] S3. The suction cup moves and transfers the sealing film to the top of the plunger of one set of heat sealing heads for positioning and fixation. The suction cup returns to normal pressure to transfer the sealing film to the plunger.

[0021] S4. The turntable drives the heat-sealing head with the sealing film to be transferred to the bottle turning device. The bottle conveyor transports the plastic bottle to the bottle turning device. The bottle turning device flips the plastic bottle to a vertical position. The plastic bottle slides down and is inserted into the rod with the sealing film.

[0022] S5. The turntable drives the heat-sealing head with the plastic bottle to the bottom of the bottle pressing mechanism. The bottle pressing cylinder drives the pressure block to press against the top of the plastic bottle, pressing the sealing film tightly between the insertion rod and the top wall of the plastic bottle. The annular heating element heats the sealing film, causing the corresponding position of the sealing film to adhere to the top wall of the plastic bottle.

[0023] S6. The turntable drives the sealed plastic bottle to the bottom of the bottle removal mechanism. The lifting device picks up the plastic bottle from the insertion rod and removes it, completing a round of film sealing process and repeating the cycle.

[0024] The beneficial effects of the present invention are as follows:

[0025] This automatic film sealing equipment for plastic bottle mouths and its working principle can automatically complete the automatic sealing of plastic bottle mouths through an automatic mechanism. It has high production efficiency, good sealing effect, safety and reliability, can improve the sealing quality while saving labor costs, and can replace the manual sealing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the top view of the structure of embodiment 1 of the present invention.

[0027] Figure 2 It is a structural schematic diagram of the film cutting mechanism and the film loading mechanism in the present invention.

[0028] Figure 3 This is a schematic structural diagram of the film loading mechanism from another angle in the present invention.

[0029] Figure 4 It is a structural schematic diagram of the bottle conveying device and bottle placing mechanism in the present invention.

[0030] Figure 5 This is a schematic structural diagram of the bottle placing mechanism in the present invention from another angle.

[0031] Figure 6 It is a schematic diagram of the cooperation structure of the medium-pressure bottle mechanism and the heat sealing head of the present invention.

[0032] Figure 7 It is a structural schematic diagram of the bottle taking mechanism in the present invention.

[0033] Figure 8 This is a schematic structural diagram of another embodiment of the heat sealing head in the present invention.

[0034] Figure 9 This is a schematic diagram of the top view of the structure of the second embodiment of the present invention.

[0035] Figure 10 This is a schematic structural diagram of the film cutting mechanism and the film loading mechanism in the second embodiment of the present invention.

[0036] Figure 11 for Figure 10 Schematic diagram of another working state structure.

[0037] Figure 12 This is a schematic diagram of the heat sealing head structure in Example 2 of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments: Example

[0039] See also Figures 1 to 7 As shown, an automatic film sealing device for the mouth of a plastic bottle includes a machine 1 and a control circuit 40. The machine 1 is provided with a turntable 11. Two or more groups of heat sealing heads 7 are evenly distributed on the turntable 11 around its rotation center. The two or more groups of heat sealing heads 7 are electrically connected to the control circuit 40. The machine 1 is provided with a film cutting mechanism 9 for cutting a sealing film 201 from an aluminum-plastic composite film 10, a film loading mechanism 3 for moving the sealing film 101 to the heat sealing head 7, a bottle placing mechanism for inserting a plastic bottle 20 into the heat sealing head 7 with the sealing film 101, a bottle pressing mechanism 6 for applying pressure to the plastic bottle 20 on the heat sealing head 7, and a bottle removing mechanism 8 for removing the plastic bottle 20 from the heat sealing head 7 along the transfer trajectory of the heat sealing head 7. The turntable 11 drives the heat sealing head 7 to the film loading mechanism 3, the bottle placing mechanism, the bottle pressing mechanism 6, and the bottle removing mechanism 8 for processing in sequence.

[0040] This automatic film sealing equipment for plastic bottle mouths can automatically complete the automatic film sealing of plastic bottle mouths through an automatic mechanism. It has high production efficiency, good sealing effect, safety and reliability. It can improve the sealing quality while saving labor costs, and can replace the manual film sealing process.

[0041] In this embodiment, the turntable 11 includes a turntable on which four groups of heat sealing heads 7 are evenly distributed, each group of hot air heads includes two heat sealing heads 7, and the film loading mechanism 3, bottle placing mechanism, bottle pressing mechanism 6 and bottle taking mechanism 8 are evenly distributed on the outer periphery of the turntable at equal intervals, and the installation positions of the above-mentioned mechanisms correspond to a group of heat sealing heads 7 respectively.

[0042] The film loading mechanism 3 is located above the film cutting mechanism 9, and the film cutting mechanism 9 includes a reeling device 2 for installing the aluminum-plastic composite film 10 roll and unwinding it, a film cutting device for cutting the sealing film 101, and a reeling device for recovering the aluminum-plastic composite film 10 after the sealing film 101 is cut off (the reeling device is not marked in the drawings of Example 1, and is marked 21 in the drawings of Example 2). The aluminum-plastic composite film 10 is tensioned and connected between the unwinding device 2 and the reeling device. The film cutting device includes a film cutting head 91 and a cutting drive device for controlling the film cutting head 91 to enter the aluminum-plastic composite film 10 and cut the sealing film 101. The film cutting head 91 and the film loading mechanism 3 are respectively located below and above the aluminum-plastic composite film 10 between the unwinding device 2 and the reeling device.

[0043] The film cutting head 91 is rotatably mounted on a lifting frame 93, which is in transmission connection with a blade advance / retract lift drive cylinder 94. A rotary cutting drive motor 95 is mounted on the lifting frame 93 and in transmission connection with the film cutting head 91. Under normal circumstances, the film cutting head 91 descends and clears the height of the aluminum-plastic composite film 10. During film cutting, the blade advance / retract lift drive cylinder 94 drives the film cutting head 91 via the lifting frame 93 to elevate and puncture the aluminum-plastic composite film 10. The rotary cutting drive motor 95 then controls the rotation of the film cutting head 91 to cut the sealing film 101.

[0044] Furthermore, the film cutting device further includes a contact head 92 . The contact head 92 is located within the rotation trajectory of the film cutting head 91 . The contact head 92 is used to support the cut sealing film 101 .

[0045] The film cutting device further includes a support plate 96 , which is located outside the film cutting head 91 and is in clearance fit with the film cutting head 91 to support the aluminum-plastic composite film 10 other than the sealing film 101 .

[0046] The film loading mechanism 3 includes a fixed supporting member 32, a transverse film shifting cylinder 31, a movable supporting platform 34, a longitudinal film shifting cylinder 38 and a suction cup 37; the fixed supporting member 32 is fixedly arranged on the machine 1 and is located above the aluminum-plastic composite film 10 and extends above the turntable 11. The fixed supporting member 32 is a fixed supporting platform, and the fixed supporting platform is provided with a makeshift hole corresponding to the above the aluminum-plastic composite film 10 and the above the turntable 11; the movable supporting platform 34 is laterally slidably arranged on the fixed supporting platform through a linear guide rail 33, and the transverse film shifting cylinder 31 is arranged between the fixed supporting platform and the movable supporting platform 34, and drives the movable supporting platform 34 to move in the area between the above the aluminum-plastic composite film 10 and the above the turntable 11; the longitudinal film shifting cylinder 38 is arranged on the movable supporting platform 34 and connected to the suction cup 37. The suction cup 37 is connected to the negative pressure air circuit. The suction cup 37 is located below the movable supporting platform 34 and corresponds to the inner side above the film cutting head 91.

[0047] An air path is provided in the suction cup 37 , an air suction hole is provided at the bottom of the suction cup 37 , an exhaust port 36 is provided on the upper side of the suction cup 37 , the exhaust port 36 and the inner ends of the air suction hole are connected to the air path, and the exhaust port 36 is connected to the negative pressure, so that suction is formed at the bottom of the suction cup 37 to suck up the sealing film 101 .

[0048] The carrier plate 96 is also provided with a floating pressure plate 97. The aluminum-plastic composite film 10 passes between the carrier plate 96 and the floating pressure plate 97. The floating pressure plate 97 has a clearance hole 971 corresponding to the film cutting head 91 and the suction cup 37. The suction cup 37 is also provided with a touch plate 35. When the suction cup 37 presses against the aluminum-plastic composite film 10, the touch plate 35 triggers the floating pressure plate 97 to move downward, clamping the aluminum-plastic composite film 10 around the film cutting head 91. This ensures that the aluminum-plastic composite film corresponding to the film cutting head 91 is fixed and taut, which is more conducive to shaping and cutting. A spring 99 is installed between the floating pressure plate 97 and the carrier plate 96. The carrier plate 96 is provided with a guide pin 98. The guide pin 98 passes through the spring 99 and then slides into the floating pressure plate 97.

[0049] The heat sealing head 7 includes an insertion rod 70 and an annular heating element 71, and the annular heating element 71 is arranged at the top of the insertion rod 70; the rotating axis of the turntable is provided with a conductive ring, and the annular heating element 71 is electrically connected to the control circuit through the conductive ring.

[0050] The specific implementation of the heat sealing head 7 includes:

[0051] Method 1: See Figure 3 As shown, the top of the insertion rod 70 is provided with an air intake port 72 corresponding to the inner side of the annular heating element 71, and a suction fan 73 is provided inside the insertion rod 70. The suction end of the suction fan 73 is connected to the air intake port 72, and the suction fan 73 is electrically connected to the control circuit through a conductive ring. The sealing film 101 is placed on the top of the insertion rod 70.

[0052] An air outlet 74 is provided below the insertion rod 70 corresponding to the suction fan 73 , and the air outlet 74 is communicated with the exhaust end of the suction fan 73 .

[0053] Method 2: See Figure 8 As shown, the top end of the insertion rod 70 is provided with an elastic protrusion 76 corresponding to the periphery of the annular heating element 71. The elastic protrusion 76 is elastically set by a spring 77. A limiting groove 78 is formed on the inner side of the elastic protrusion 76, and the sealing film 101 is placed in the limiting groove 78.

[0054] The bottle placing mechanism includes a bottle conveying device 4 and a bottle turning device 5. An inclined introduction plate 44 is provided between the bottle conveying device 4 and the bottle turning device 5. The bottle conveying device 4 conveys the plastic bottle 20 to the bottle turning device 5 via the inclined introduction plate 44. The bottle turning device 5 turns the plastic bottle 20 to a vertical state and allows the plastic bottle 20 to be placed on the heat sealing head 7 with the sealing film 101.

[0055] The bottle turning device 5 includes a turning seat 51, which is provided with a glue bottle positioning groove 511 adapted to the surface shape of the glue bottle 20. The glue bottle positioning groove 511 is an arc-shaped structure in this embodiment. A linkage arm 52 is fixedly provided at one end of the turning seat 51, and a power turning shaft 53 is provided at one end of the linkage arm 52 to drive the linkage arm 52 to drive the turning seat 51 to turn 90°. An air circuit is also provided in the turning seat 51, and an air suction hole is provided on the groove surface of the glue bottle positioning groove 511. An exhaust port 512 is provided on the back side of the turning seat 51. The exhaust port 512 and the inner end of the air suction hole are connected to the air circuit, and the exhaust port 512 is connected to the negative pressure, so that suction is formed at the bottom of the glue bottle positioning groove 511, so that the bottle body can be sucked in the process of the turning seat 51 turning the glue bottle 20.

[0056] The bottle conveying device 4 includes a conveyor belt, and an inclined introduction plate 44 is provided between the conveyor belt and the plastic bottle positioning groove 511. The height of the groove wall of the plastic bottle positioning groove 511 is higher on the side away from the inclined introduction plate 44 than on the other side close to the inclined introduction plate 44. This structure allows the plastic bottle to roll into the plastic bottle positioning groove 511 along the inclined introduction plate 44. Since the plastic bottle has a certain inertia when rolling into the plastic bottle positioning groove 511, the height of the groove wall of the plastic bottle positioning groove 511 is higher on the side away from the conveyor belt than on the other side close to the conveyor belt, which is convenient for stopping the plastic bottle.

[0057] The bottle pressing mechanism 6 includes a first fixed frame 62, a bottle pressing cylinder 61 and a pressing block 63. The first fixed frame 62 is fixedly set on the machine 1 and suspended above the turntable; the pressing block 63 is located above the movement trajectory of the heat sealing head 7 and is transmission-connected to the bottle pressing cylinder 61. The bottle pressing cylinder 61 is set on the first fixed frame 62.

[0058] The bottle picking mechanism 8 includes a second fixed frame 83, a movable frame 81, a bottle moving power unit 84 and a lifting device for clamping the plastic bottle 20. The second fixed frame 83 is fixedly set on the machine platform 1, and one end of the second fixed frame 83 is suspended above the turntable. The movable frame 81 is slidably set on the second fixed frame 83. The bottle moving power unit 84 is a bottle moving cylinder connected between the second fixed frame 83 and the movable frame 81, and controls the movable frame 81 to move between the top of the machine platform 1 and the top of the turntable. The lifting device is set on the movable frame 81.

[0059] The lifting device includes a mechanical gripper 85 and a lifting cylinder 82. The lifting cylinder 82 is connected between the mechanical gripper 85 and the movable frame 81, and controls the mechanical gripper 85 to move up and down to pull the sealed plastic bottle 20 off the insertion rod 70. A discharge slide 12 is obliquely arranged above the machine 1 corresponding to the discharge position of the mechanical gripper 85. A storage box 13 for collecting the plastic bottles 20 is also provided at the discharge end of the discharge slide 12.

[0060] Based on the working principle of the automatic film sealing device for plastic bottle mouths in Example 1, the process is as follows:

[0061] S1. The bottle conveyor 4 conveys the plastic bottle 20 along the direction indicated by R01. The unwinding device 2 cooperates with the rewinding device to convey the aluminum-plastic composite film 10 along the direction indicated by C. The aluminum-plastic composite film 10 passes between the carrier plate 96 and the floating pressure plate 97. The longitudinal film transfer cylinder 38 drives the touch plate 35 and the suction cup 37 to move along the direction indicated by H1. When the suction cup 37 presses the aluminum-plastic composite film 10, the touch plate 35 triggers the floating pressure plate 97 to move downward, and the carrier plate 96 and the floating pressure plate 97 clamp the aluminum-plastic composite film 10 to fix it.

[0062] S2. The advance and retract knife lifting and driving cylinder 94 drives the film cutting head 91 to rise in the direction indicated by H2 through the lifting frame 93 and pierce the aluminum-plastic composite film 10. Then, the rotary cutting driving motor 95 controls the film cutting head 91 to rotate in the direction indicated by R1 to cut out the sealing film 101. The sealing film 101 is clamped between the suction cup 37 and the contact head 92. Thereafter, the suction cup 37 is exhausted in the direction indicated by E, so that suction is formed at its bottom to suck up the sealing film 101. After the sealing film 101 is sucked up, the supporting plate 96 and the floating pressure plate 97 release the aluminum-plastic composite film 10 to enable it to continue to move forward.

[0063] It should also be noted that: the aluminum-plastic composite film 10 passes through the film loading mechanism 3 in the marked A state. After the two film cutting heads 91 cut the film, a space sufficient to cut out another sealing film 101 will be formed between the two adjacent hollowed-out holes corresponding to the makeshift holes on the aluminum-plastic composite film 10. Therefore, in the next round of film cutting, the two film cutting heads 91 will cut the film before and after the last hollowed-out hole. The aluminum-plastic composite film 10 cut in this way is output in the marked B state.

[0064] S3. After the transverse and longitudinal film transfer cylinders 31 and 38 move together, the suction cup 37 transfers the sealing film 101 along the direction indicated by D1 to the top of the insertion rod 70 of the heat sealing head 7. The suction fan 73 operates to suck air through the suction port 72 in the direction indicated by F and creates negative pressure. Alternatively, the sealing film 101 is fixed by the limiting groove 78. Then, the suction cup 37 returns to normal pressure to transfer the sealing film 101 to the insertion rod 70.

[0065] S4. The turntable drives the heat-sealing head 7 equipped with the sealing film 101 to rotate in the direction indicated by R0 and transfer it to the bottom of the bottle turning device 5. At this time, the bottle conveyor 4 moves in the direction indicated by R2, so that the plastic bottle 20 on the bottle conveyor 4 is conveyed in the direction indicated by G, so that the plastic bottle 20 can fall into the plastic bottle positioning groove 511 in the direction indicated by I. At this time, the turning seat 51 exhausts air in the direction indicated by J, creating a negative pressure to suck the plastic bottle 20. Thereafter, the turning seat 51 is driven by the power turning shaft 53 to turn 90° about the direction indicated by R3, so that the opening at the bottom of the plastic bottle 20 is aligned with the top of the insertion rod 70. Finally, the turning seat 51 releases the negative pressure, allowing the plastic bottle 20 to fall and be inserted outside the insertion rod 70.

[0066] S5. The turntable drives the heat-sealing head 7, which is covered with the plastic bottle 20, to continue rotating in the direction indicated by R0 and transfer to the bottom of the bottle pressing mechanism 6. The bottle pressing cylinder 61 drives the pressing block 63 to move in the direction indicated by H2, so that the pressing block 63 presses against the top of the plastic bottle 20, pressing the sealing film 101 between the insertion rod 70 and the top wall of the plastic bottle 20. Then, the annular heating element 71 operates to heat the sealing film 101, causing the corresponding position of the sealing film 101 to adhere to the top wall of the plastic bottle 20, completing a round of sealing of the plastic bottle 20.

[0067] S6. The turntable drives the sealed plastic bottle 20 to continue rotating in the direction indicated by R0 and transfer it to the bottom of the bottle-taking mechanism 8. The lifting cylinder 82 drives the mechanical gripper 85 to lift and lower in the direction indicated by H3. The mechanical gripper 85 clamps the plastic bottle 20 from the insertion rod 70. Then, the bottle-moving power unit 84 drives the movable frame 81 to drive the mechanical gripper 85 to slide in the direction indicated by K, and transfers the clamped plastic bottle 20 from the turntable position to the top of the discharge slide 12. The mechanical gripper 85 releases the plastic bottle 20, and the plastic bottle 20 falls in the direction indicated by H4 onto the discharge slide 12. The discharge slide 12 slides the plastic bottle 20 out of the storage box 13 to realize discharge. Afterwards, the heat sealing head 7 will rotate again to the bottom of the film loading mechanism 3 to wait for the next film loading, and the cycle continues. Example

[0068] The difference from the first embodiment is: Figures 9 to 12 As shown, the film cutting device includes a film punching head 910, a cutting template 911, and a punch lifting drive cylinder 913. The film punching head 910 and the cutting template 911 are respectively located below and above the aluminum-plastic composite film 10 between the unwinding device 2 and the winding device. The film loading mechanism 3 is located above the cutting template 911. The cutting template 911 is provided with a cutting cavity 912 running through the upper and lower sides thereof corresponding to the film punching head 910. The punch lifting drive cylinder 913 is arranged on the machine platform 1 and is used to control the lifting movement of the film punching head 910.

[0069] The fixed supporting member 32 is a cantilever beam, the two ends of which are respectively located above the aluminum-plastic composite film 10 and above the turntable 11, and are staggered with respect to the vertical area of ​​the film punching head 910. The transverse film transfer cylinder 31 is arranged between the cantilever beam and the movable support 34, and drives the movable support 34 to move in the area between the aluminum-plastic composite film 10 and above the turntable 11. The longitudinal film transfer cylinder 38 is linearly slidably matched with the cantilever beam through a linear guide 33 and is transmission-connected to the movable support 34. The suction cup 37 corresponds to the center of the film punching head 910. The top surface of the film punching head 910 has a certain spiral angle, so that when it is inserted into the cutting cavity 912, the top edge of the film punching head 910 and the bottom edge of the cutting cavity 912 form a rotary cutting relationship, thereby better cutting out the circular sealing film 101.

[0070] A floating suction head 75 is provided at the top center of the insertion rod 70. The floating suction head 75 is supported on the insertion rod 70 through an elastic member 79. An air inlet 72 is provided at the top of the floating suction head 75. A rotary air distribution joint 100 is provided at the top center of the turntable 11. The air inlet 72 is connected to the second negative pressure air path Q through the rotary air distribution joint 100. Since the equipment is in a continuous working state, the annular heating element 71 of the heat sealing head 7 still has a very high residual temperature even if it is started intermittently, and the sealing film 101 is not suitable for contact with it. Therefore, the floating suction head 75 is provided to lift the sealing film 101 and to separate the sealing film 101 from the annular heating element 71 by a certain distance before the sealing film 101 is pressurized. Under the action of the bottle pressing mechanism 6, the bottle body and the sealing film 101 are pressed down together, and the annular heating element 71 is started, so that the sealing film 101 is hot-melt-bonded to the inner top surface of the bottle body.

[0071] Of course, the air inlet 72 may be selectively connected to the atmosphere or the second negative pressure air path Q through a three-way solenoid valve. When connected to the atmosphere, negative pressure adsorption is not formed, making it easier to remove the suction cup 37.

[0072] Based on the working principle of the automatic film sealing device for the mouth of a plastic bottle in the second embodiment, the difference between the process and the first embodiment is that:

[0073] S2. The punching head 910 pushes the aluminum-plastic composite film 10 toward the cutting cavity 912 of the cutting template 911 to cut out the sealing film 101. The suction cup 37 is compressed and deformed upward under the action of the punching head 910; eventually, the suction cup 37 sucks up the sealing film 101.

[0074] The above is a preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. An automatic film sealing device for a plastic bottle, comprising a machine (1) and a control circuit (40), characterized in that: The machine (1) is provided with a turntable (11), and four groups of heat sealing heads (7) are evenly distributed on the turntable (11) around its rotation center, and the heat sealing heads (7) are electrically connected to the control circuit (40); along the transfer track of the heat sealing head (7), the machine (1) is provided with a film cutting mechanism (9) for cutting out a sealing film (101) from the aluminum-plastic composite film (10), a film loading mechanism (3) for moving the sealing film (101) to the heat sealing head (7), a bottle placing mechanism for inserting the glue bottle (20) into the heat sealing head (7) with the sealing film (101), a bottle pressing mechanism (6) for applying pressure to the glue bottle (20) on the heat sealing head (7), and a bottle taking mechanism (8) for taking out the glue bottle (20) from the heat sealing head (7); the turntable drives the heat sealing head (7) to the film loading mechanism (3), the bottle placing mechanism, the bottle pressing mechanism (6) and the bottle taking mechanism (8) in sequence for processing; The heat sealing head (7) comprises an insert rod (70) and an annular heating element (71), wherein the annular heating element (71) is arranged at the top end of the insert rod (70), and the annular heating element (71) is electrically connected to the control circuit; The top end of the insertion rod (70) is provided with an elastic protrusion (76) corresponding to the outer periphery of the annular heating element (71), and a limiting groove (78) is formed on the inner side of the elastic protrusion (76), and the sealing film (101) is placed in the limiting groove (78); or, the top end of the insertion rod (70) is provided with an air intake (72) corresponding to the inner side of the annular heating element (71), and a suction fan (73) is provided in the insertion rod (70), and the suction end of the suction fan (73) is connected to the suction port (72), and the suction fan (73) is connected to the annular heating element (71) through a conductive ring. The control circuit is electrically connected, and the sealing film (101) is placed on the top of the insertion rod (70); or, a floating suction head (75) is provided at the center of the top of the insertion rod (70), and the floating suction head (75) is supported on the insertion rod (70) through an elastic member (79), and a suction port (72) is provided at the top of the floating suction head (75), and a rotary air distribution joint (100) is provided at the center of the top surface of the turntable (11), and the suction port (72) is connected to the second negative pressure air path (Q) through the rotary air distribution joint (100).

2. The automatic film sealing equipment for plastic bottle mouth according to claim 1 is characterized in that The film loading mechanism (3) is located above the film cutting mechanism (9), and the film cutting mechanism (9) includes a reeling device (2) for loading and unwinding the aluminum-plastic composite film (10), a film cutting device for cutting the sealing film (101), and a reeling device for recovering the aluminum-plastic composite film (10) after the sealing film (101) is cut off. The aluminum-plastic composite film (10) is tensioned and connected between the reeling device (2) and the reeling device; The film cutting device comprises a film cutting head (91) and a cutting drive device for controlling the film cutting head (91) to enter the aluminum-plastic composite film (10) and cut the sealing film (101), the film cutting head (91) and the film loading mechanism (3) are respectively located below and above the aluminum-plastic composite film (10) between the unwinding device (2) and the rewinding device; or, the film cutting device comprises a film punching head (910), a cutting template (911), a punching head lifting drive cylinder (913), and the film punching head ( The film loading mechanism (3) is located above the cutting template (911). The cutting template (911) is provided with a cutting cavity (912) running through the upper and lower sides of the cutting template (911) corresponding to the punching head (910). The punching head lifting drive cylinder (913) is provided on the machine (1) and is used to control the lifting movement of the punching head (910).

3. The automatic film sealing device for plastic bottle mouth according to claim 2 is characterized in that The film loading mechanism (3) comprises a fixed bearing member (32), a transverse film transfer cylinder (31), a movable support platform (34), a longitudinal film transfer cylinder (38) and a suction cup (37); the fixed bearing member (32) is fixedly arranged on the machine platform (1), and is located above the aluminum-plastic composite film (10) and extends above the turntable (11); the suction cup (37) is arranged below the movable support platform (34) and is connected to the first negative pressure air path (E); The fixed bearing member (32) is a fixed support, and the fixed support is provided with a clearance hole corresponding to the upper part of the aluminum-plastic composite film (10) and the upper part of the turntable (11). The movable support (34) is arranged on the fixed support for transverse sliding. The transverse film shifting cylinder (31) is arranged between the fixed support and the movable support (34) and drives the movable support (34) to move in the area between the upper part of the aluminum-plastic composite film (10) and the upper part of the turntable (11). The longitudinal film shifting cylinder (38) is arranged on the movable support (34) and is connected to the suction cup (37). The suction cup (37) corresponds to the inner side of the film cutting head (91). Alternatively, the fixed bearing member (32) is a cantilever beam, the two ends of the cantilever beam are respectively located above the aluminum-plastic composite film (10) and above the turntable (11), and are staggered with respect to the vertical region of the film punching head (910); the transverse film transfer cylinder (31) is arranged between the cantilever beam and the movable support platform (34), and drives the movable support platform (34) to move in the region between above the aluminum-plastic composite film (10) and above the turntable (11); the longitudinal film transfer cylinder (38) is linearly slidably matched with the cantilever beam and is transmission-connected to the movable support platform (34); the suction cup (37) is correspondingly located above the center of the film punching head (910).

4. The automatic film sealing device for plastic bottle mouths according to claim 1, characterized in that: The bottle placing mechanism comprises a bottle conveying device (4) and a bottle turning device (5). The bottle conveying device (4) conveys the plastic bottle (20) to the bottle turning device (5). The bottle turning device (5) turns the plastic bottle (20) to a vertical state and allows the plastic bottle (20) to be placed on a heat sealing head (7) with a sealing film (101).

5. The automatic film sealing device for plastic bottle mouths according to claim 1, characterized in that: The bottle pressing mechanism (6) comprises a first fixed frame (62), a bottle pressing cylinder (61) and a pressing block (63). The first fixed frame (62) is fixedly arranged on the machine platform (1) and suspended above the turntable (11). The pressing block (63) is located above the motion trajectory of the heat sealing head (7) and is in transmission connection with the bottle pressing cylinder (61). The bottle pressing cylinder (61) is arranged on the first fixed frame (62).

6. The automatic film sealing device for plastic bottle mouths according to claim 1, characterized in that: The bottle picking mechanism (8) comprises a second fixed frame (83), a movable frame (81), a bottle moving power unit (84) and a lifting device for clamping the plastic bottle (20), wherein the second fixed frame (83) is fixedly arranged on the machine platform (1), one end of the second fixed frame (83) is suspended above the turntable (11), the movable frame (81) is slidably arranged on the second fixed frame (83), the bottle moving power unit (84) is connected between the second fixed frame (83) and the movable frame (81), and controls the movable frame (81) to move between above the machine platform (1) and above the turntable (11), and the lifting device is arranged on the movable frame (81).

7. The automatic film sealing device for plastic bottle mouths according to claim 3, characterized in that: The suction cup (37) is made of elastic material.

8. The working principle of the automatic film sealing device for plastic bottle mouth according to claim 1 is characterized in that The process is as follows: S1. The bottle conveying device (4) conveys the plastic bottle (20), the unwinding device (2) and the rewinding device convey the aluminum-plastic composite film (10), the aluminum-plastic composite film (10) passes through the area between the film loading mechanism (3) and the film cutting device, the longitudinal film transfer cylinder (38) drives the suction cup (37) to move, and the suction cup (37) presses the aluminum-plastic composite film (10) and fixes the aluminum-plastic composite film (10); S2. The cutting drive device drives the film cutting head (91) to move upward and rotate axially, and the film cutting head (91) cuts out the sealing film (101) by rotating after piercing the aluminum-plastic composite film (10); or, the film punching head (910) pushes the aluminum-plastic composite film (10) into the cutting cavity (912) of the cutting template (911) to cut out the sealing film (101), and the suction cup (37) is compressed and deformed upward under the action of the film punching head (910); finally, the suction cup (37) sucks up the sealing film (101); S3. The suction cup (37) moves and transfers the sealing film (101) to the top of the insertion rod (70) of one set of heat sealing heads (7) for positioning and fixing, and the suction cup (37) restores normal pressure to transfer the sealing film (101) to the insertion rod (70); S4. The turntable (11) drives the heat sealing head (7) equipped with the sealing film (101) to be transferred to the bottle turning device (5). The bottle conveying device (4) conveys the plastic bottle to the bottle turning device (5). The bottle turning device (5) turns the plastic bottle to a vertical state. The plastic bottle slides downward and is inserted into the outside of the insertion rod (70) equipped with the sealing film (101); S5. The turntable (11) drives the heat sealing head (7) with the plastic bottle (20) to be transferred to the bottom of the bottle pressing mechanism (6). The bottle pressing cylinder (61) drives the pressing block (63) to press against the top of the plastic bottle (20), so that the sealing film (101) is pressed between the insertion rod (70) and the top wall of the plastic bottle (20). The annular heating element (71) heats the sealing film (101), so that the corresponding position of the sealing film (101) is adhered to the top wall of the plastic bottle (20); S6. The turntable (11) drives the sealed plastic bottle (20) to be transferred to the bottom of the bottle-taking mechanism (8), and the lifting device clamps the plastic bottle (20) from the insertion rod (70) and removes it, thereby completing a round of film sealing process and repeating the cycle in sequence.

Images