Bottled milk packaging system

Abstract

The invention provides a bottled milk packaging system which comprises a bottled milk conveying line, a heat shrinkage film labeling machine and a heat shrinkage film forming machine which are sequentially erected on the bottled milk conveying line, and a heat shrinkage film pre-shaping device is erected between the heat shrinkage film labeling machine and the heat shrinkage film forming machine. The two sides of the conveying face of the bottled milk conveying line are each provided with a limiting stopping piece, the two limiting stopping pieces are oppositely arranged and extend in parallel in the conveying direction of the bottled milk conveying line, one ends of the two limiting stopping pieces extend to an input port of the heat shrinkage film labeling machine, and the other ends of the two limiting stopping pieces extend into the heat shrinkage film pre-shaping device. The heat shrink film pre-shaping device is in contact with the two sides of the outer side wall of the bottled milk entering the heat shrink film labeling machine, a stopper is formed on the outer side wall of the bottled milk, a heat shrink film bottle label sleeving the outer wall of the bottled milk is limited, and the heat shrink film pre-shaping device and the bottled milk conveying line operate at the same speed and in the same direction so as to assist in conveying the bottled milk into the heat shrink film pre-shaping device for pre-shaping. And the heat shrinkage film bottle labels are kept highly consistent on the bottled milk.

Description

Technical Field

[0001] The invention relates to the technical field of bottled milk packaging, and in particular to a bottled milk packaging system. Background Art

[0002] The heat shrink film labeling machine is a mature outer packaging equipment with a wide range of applications in the field of bottled milk packaging. Its working principle is to put a heat shrink film bottle label with a printed pattern on the outer surface of the bottled milk. The heat shrink film bottle label is usually made of polyethylene material. After heating, it can shrink rapidly and fit on the outer wall of the bottled milk to form a tight outer packaging. The outer surface of the bottled milk can be marked to show the appearance and pattern of the bottled milk, increase the aesthetics, and enhance the visual appeal and market competitiveness of the product.

[0003] In the existing thermoplastic packaging process of bottled milk, since the outer wall of the bottled milk is relatively smooth and a certain gap needs to be reserved between the heat shrink film bottle label and the outer wall of the bottled milk, the heat shrink film bottle label is easily slid downward during the thermoplastic process on the bottled milk, resulting in inconsistent height of the heat shrink film bottle label on the outer wall of the bottled milk. Summary of the invention

[0004] In view of this, it is necessary to provide a bottled milk packaging system to solve the technical problem in the prior art that the heat shrink film bottle label easily slides downward during the thermoplastic packaging process of the bottled milk, resulting in inconsistent height of the heat shrink film bottle label on the outer wall of the bottled milk.

[0005] The technical solution adopted by the present invention to solve its technical problem is: A bottled milk packaging system comprises a bottled milk conveyor line, a heat shrink film sleeve labeling machine and a heat shrink film forming machine which are sequentially mounted on the bottled milk conveyor line, a heat shrink film pre-forming device is mounted between the heat shrink film sleeve labeling machine and the heat shrink film forming machine, a limit stopper is respectively arranged on both sides of the conveying surface of the bottled milk conveyor line, the two limit stops are arranged opposite to each other and extend in parallel along the conveying direction of the bottled milk conveyor line, one end of the two limit stops extends to the input port of the heat shrink film sleeve labeling machine, and the other end of the two limit stops extends into the heat shrink film pre-forming device, the two limit stops contact with both sides of the outer wall of the bottled milk entering the heat shrink film sleeve labeling machine, form a stopper on the outer wall of the bottled milk, so as to limit the heat shrink film bottle label sleeved on the outer wall of the bottled milk by the heat shrink film sleeve labeling machine, and operate at the same speed and direction as the bottled milk conveyor line, so as to assist the bottled milk conveyor line to transport the bottled milk sleeved with the heat shrink film bottle label to the heat shrink film pre-forming device for pre-forming.

[0006] Preferably, each of the limit stoppers comprises a limit bracket, a stop belt, an auxiliary conveying motor and a plurality of guide wheels, the limit bracket is extended and arranged in parallel with the conveying direction of the bottled milk conveying line, the plurality of guide wheels are arranged on the side of the limit bracket facing the bottled milk conveying line, and are arranged at intervals along the length direction of the limit bracket, the axial direction of each guide wheel is vertically arranged, and the height is consistent, the guide wheel arranged at one end of the limit bracket is located at the input port of the heat shrink film sleeve labeling machine, and the guide wheel arranged at the other end of the limit bracket is located at the output end of the heat shrink film pre-forming device, the stop belt is annularly sleeved on the guide wheels located at both ends of the limit bracket along the length direction of the limit bracket, and the The auxiliary transmission motor is arranged on the limit bracket and is connected with the guide wheel shaft located at one end of the limit bracket to drive the guide wheel to drive the stop belt to run at the same speed and in the same direction as the bottled milk conveying line. The stop belts on the two relatively arranged limit stoppers form a channel for the bottled milk to pass through between the input port of the heat shrink film sleeve labeling machine and the output end of the heat shrink film pre-forming device, and contact with both sides of the outer wall of the bottled milk conveyed on the bottled milk conveying line to form a stop on the outer wall of the bottled milk to limit the heat shrink film bottle label put on the outer wall of the bottled milk by the heat shrink film sleeve labeling machine, so that it maintains a preset height on the outer wall of the bottled milk and enters the heat shrink film pre-forming device for pre-forming.

[0007] Preferably, the height of the limiting bracket is a preset height, and the height is adjustable.

[0008] Preferably, a flexible buffer layer is provided on the opposite outer side walls of the two stop strips.

[0009] Preferably, an auxiliary labeling device is respectively arranged on both sides of the bottled milk conveying line between the heat shrinkable film labeling machine and the heat shrinkable film pre-forming device, and the two auxiliary labeling devices respectively include an auxiliary labeling brush, an auxiliary labeling motor and a mounting frame. The mounting frames of the two auxiliary labeling devices are respectively arranged on the upper ends of the two limit brackets, and the auxiliary labeling brushes of the two auxiliary labeling devices are respectively arranged transversely on the two mounting frames, and are transversely arranged just above the bottled milk conveying line through the two mounting frames. The axial directions of the two auxiliary labeling brushes are both oriented towards the conveying direction of the bottled milk conveying line and are aligned with each other. The auxiliary labeling motors of the two auxiliary labeling devices are respectively arranged on the two mounting frames and are respectively connected to the two auxiliary labeling brush shafts. The auxiliary labeling motors respectively drive the two auxiliary labeling brushes to rotate in opposite directions from top to bottom along the outer side wall of the bottled milk conveyed on the bottled milk conveying line, so as to assist the heat shrinkable film bottle label sleeved by the heat shrinkable film labeling machine on the outer wall of the bottled milk to move downward into place along the outer side wall of the bottled milk.

[0010] Preferably, the heat shrink film pre-forming device includes a pre-forming channel for bottled milk to pass through, the pre-forming channel is set up on the bottled milk conveyor line, the stop belts of the two limit stoppers pass through the two sides of the pre-forming channel, and strip electric heaters are arranged opposite to each other on both sides of the pre-forming channel. The strip electric heaters are arranged transversely along the conveying direction of the bottled milk conveyor line, and the strip electric heaters are arranged above the stop belt and close to the stop belt to pre-shrink and shape the two sides of the lower end of the heat shrink film bottle label mounted on the bottled milk.

[0011] Preferably, a bottled milk flow control roller and a guide plate are arranged in front of the input port of the heat shrink film sleeve labeling machine on the bottled milk conveyor line, the bottled milk flow control roller is rotatably arranged on one side above the conveying surface of the bottled milk conveyor line, the axial direction of the bottled milk flow control roller faces the conveying direction of the bottled milk conveyor line, the outer side wall of the bottled milk flow control roller is provided with a positive thread groove for pushing and conveying the bottled milk along its circumference, the pitch of the positive thread groove is a preset distance, the guide plate is arranged on the other side above the conveying surface of the bottled milk conveyor line, and the guide plate is arranged along the other side of the conveying surface of the bottled milk conveyor line. The conveying direction of the bottled milk conveyor line is extended and arranged parallel to the axial direction of the bottled milk flow control roller, and the side wall of the guide plate is directly opposite to the bottled milk flow control roller. A push channel for the bottled milk to enter is formed between the positive thread groove on the bottled milk flow control roller and the guide plate. A flow control motor is arranged at the axial end of the bottled milk flow control roller. The flow control motor drives the bottled milk flow control roller to rotate in the positive direction toward the guide plate, so as to roll the bottled milk conveyed on the bottled milk conveyor line into the push channel in sequence, and transmit the bottled milk to the direction of the heat shrink film sleeve labeling machine at equal intervals.

[0012] Preferably, an auxiliary flow control brush is provided in front of the bottled milk flow control roller on the bottled milk conveyor line. There are two auxiliary flow control brushes, which are relatively arranged on both sides of the bottled milk conveyor line. The two auxiliary flow control brushes are in frictional contact with both sides of the outer wall of the bottled milk conveyed on the bottled milk conveyor line, and the friction force is used to slow down the conveying speed of the bottled milk on the bottled milk conveyor line to control the flow of the bottled milk.

[0013] Preferably, a capping device and an air-drying device are further provided on the bottled milk conveyor line, the capping device is arranged in front of the auxiliary flow control brush, and the air-drying device is arranged in front of the capping device. The bottled milk conveyor line conveys the bottled milk to the air-drying device, and the outer surface of the bottled milk is air-dried by the air-drying device. The air-dried bottled milk is further conveyed by the bottled milk conveyor line to the capping device, and the bottled milk is capped and packaged by the capping device. The bottled milk after capping and packaging is further conveyed by the bottled milk conveyor line to the direction of the heat shrink film sleeve labeling machine to be sleeved with heat shrink film bottle labels.

[0014] Preferably, a box sealing device is further provided at the output end of the bottled milk conveying line, and the bottled milk after shrinkage molding by the heat shrinkable film molding machine is input into the box sealing device through the bottled milk conveying line and is sealed by the box sealing device.

[0015] In the above-mentioned bottled milk packaging system, a heat shrink film pre-forming device is arranged between the heat shrink film sleeve labeling machine and the heat shrink film forming machine, and a limit stopper is respectively arranged on both sides of the conveying surface of the bottled milk conveying line, and the two limit stops are arranged opposite to each other and extend in parallel along the conveying direction of the bottled milk conveying line, one end of the two limit stops extends to the input port of the heat shrink film sleeve labeling machine, and the other end of the limit stopper extends into the heat shrink film pre-forming device, and the two limit stops are in contact with both sides of the outer wall of the bottled milk entering the heat shrink film sleeve labeling machine, and the bottled milk is sealed in the bottle. A stopper is formed on the outer wall of the milk to limit the heat shrink film bottle label put on the outer wall of the bottled milk by the heat shrink film labeling machine to prevent the heat shrink film bottle label from shifting downward, and the two limit stoppers run at the same speed and direction as the bottled milk conveying line. During the conveying process to the heat shrink film pre-molding device, the two limit stoppers always keep in contact with both sides of the outer wall of the bottled milk to keep the height limit of the heat shrink film bottle label until the bottled milk is transferred into the heat shrink film pre-molding device for pre-molding, and then conveyed by the bottled milk conveying line to the heat shrink film forming machine for final molding. In this way, the heat shrink film bottle label put on the bottled milk can maintain a consistent height on the bottled milk under the action of the two limit stoppers, and after being pre-molded by the heat shrink film pre-molding device, the heat shrink film bottle label can be prevented from shifting, so that the heat shrink film bottle label is consistent in height on the outer wall of the bottled milk after being finally molded by the heat shrink film forming machine, and keeps it neat and uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a side structural schematic diagram of the invention.

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the invention.

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure from another angle of the invention.

[0019] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure along the middle edge AA.

[0020] Figure 5 It is a schematic diagram of the local structure of the invention.

[0021] Figure 6 It is a schematic diagram of the partial structure from another angle of the invention.

[0022] Figure 7 This is a schematic diagram of the limit stop structure of the invention.

[0023] Figure 8 It is a schematic structural diagram of another preferred embodiment of the invention.

[0024] In the figure: bottled milk conveyor line 10, heat shrink film sleeve labeling machine 20, heat shrink film forming machine 30, heat shrink film pre-forming device 40, pre-forming channel 401, strip electric heater 402, limit stop 50, limit bracket 501, stop belt 502, auxiliary conveying motor 503, guide wheel 504, buffer layer 505, adjustment screw 506, auxiliary sleeve labeling device 60, auxiliary sleeve labeling brush 601, auxiliary sleeve labeling motor 602, mounting frame 603, bottled milk flow control roller 70, guide plate 71, positive thread groove 72, flow control motor 73, auxiliary flow control brush 74, capping device 80, air drying device 90, and box sealing device 100. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 7The embodiment of the present invention provides a bottled milk packaging system, including a bottled milk conveyor line 10, a heat shrink film sleeve labeling machine 20 and a heat shrink film forming machine 30 sequentially mounted on the bottled milk conveyor line 10, a heat shrink film pre-forming device 40 is also mounted between the heat shrink film sleeve labeling machine 20 and the heat shrink film forming machine 30, the bottled milk conveyor line 10 is a chain plate conveyor for conveying packaged bottled milk, and a limit stopper 50 is respectively arranged on both sides of the conveying surface of the bottled milk conveyor line 10, and the two limit stops are arranged opposite to each other and are arranged along the bottled milk conveyor line 10. The two limit stoppers 50 extend parallel to the conveying direction of the bottled milk, one end of the two limit stoppers 50 extends to the input port of the heat shrink film sleeve labeling machine 20, and the other end of the limit stoppers 50 extends into the heat shrink film pre-forming device 40. When the bottled milk conveying line 10 conveys the bottled milk to be sleeved with the heat shrink film bottle label into the input port of the heat shrink film sleeve labeling machine 20, the two limit stoppers 50 located on both sides of the bottled milk conveying line 10 simultaneously contact the two sides of the outer wall of the bottled milk, and the two limit stoppers 50 are close to the lower end of the outer wall of the bottled milk to form a stopper on the outer wall of the bottled milk for contacting the heat shrink film bottle label. The heat shrink film sleeve labeling machine 20 sleeves the heat shrink film bottle label on the outer wall of the bottled milk, and the lower end of the heat shrink film bottle label is stopped by the two limit stoppers 50, so that it will not slide toward the bottom of the bottled milk. The heights of the two limit stoppers 50 are preset heights and can be set according to needs. The two limit stoppers 50 run at the same speed and in the same direction as the bottled milk conveyor line 10 to assist the bottled milk conveyor line 10 in conveying the bottled milk with the heat shrink film bottle label to the heat shrink film pre-forming device 40. During the process of forming the bottled milk, the two limit stoppers 50 always keep in contact with the two sides of the outer wall of the bottled milk to keep the height of the heat shrink film bottle label limited until the bottled milk is transferred into the heat shrink film pre-forming device 40, and the heat shrink film bottle label inserted thereon is pre-formed by the heat shrink film pre-forming device 40. After the bottled milk with the heat shrink film bottle label is pre-formed by the heat shrink film pre-forming device 40, it is conveyed to the heat shrink film forming machine 30 by the bottled milk conveying line 10, and the heat shrink film bottle label on the bottled milk is finally formed by the heat shrink film forming machine 30. Under the action of the two limit stoppers 50, the heat shrink film bottle label on the bottled milk can maintain a consistent height on the bottled milk, and after being pre-formed by the heat shrink film pre-forming device 40, the heat shrink film bottle label can be prevented from shifting, so that the heat shrink film bottle label can be consistent in height on the outer wall of the bottled milk after being finally formed by the heat shrink film forming machine 30, so that the outer packaging of the bottled milk remains neat and uniform.

[0027] Specifically, the two limit stoppers 50 are respectively mounted on both sides of the bottled milk conveyor line 10 and are arranged opposite to each other. Each of the limit stoppers 50 includes a limit bracket 501, a stop belt 502, an auxiliary conveying motor 503 and a plurality of guide wheels 504. The limit bracket 501 is extended in parallel along the conveying direction of the bottled milk conveyor line 10. The plurality of guide wheels 504 are arranged on the side of the limit bracket 501 facing the bottled milk conveyor line 10 and are arranged at intervals along the length direction of the limit bracket 501. The axial direction of each guide wheel 504 is vertically arranged and has the same height. The guide wheel 504 arranged at one end of the limit bracket 501 is located at the input port of the heat shrink film sleeve labeling machine 20, and the guide wheel 504 arranged at the other end of the limit bracket 501 is arranged at the input port of the heat shrink film sleeve labeling machine 20. 504 is located at the output end of the heat shrink film preforming device 40, the guide wheel 504 is a pulley with a groove, the stop belt 502 is an endless belt, which is annularly sleeved on the guide wheels 504 at both ends of the limit bracket 501 along the length direction of the limit bracket 501, the stop belt 502 and the guide wheel 504 match each other, and the guide wheel 504 located in the middle of the limit bracket 501 supports the stop belt 502, so that the stop belt 502 is in a straight line toward one side of the bottled milk conveyor line 10, and the auxiliary transmission motor 503 is a servo motor, which is arranged on the limit bracket 501 and is connected to the guide wheel 504 shaft at one end of the limit bracket 501 to drive the guide wheel 504 to drive the stop belt 502 to perform annular operation, and the stop belt 5 The running direction of the milk conveyor line 10 is the same as that of the bottled milk conveyor line 10, and the stop belts 502 on the two relatively arranged limit stoppers 50 are located on both sides of the bottled milk conveyor line 10 between the input port of the heat shrink film sleeve labeling machine 20 and the output end of the heat shrink film pre-forming device 40 to form a channel for the bottled milk to pass through. The outer side walls of the two stop belts 502 facing the bottled milk are both provided with flexible buffer layers 505, and the buffer layers 505 are made of high temperature resistant fiber cotton. The bottled milk conveyor line 10 conveys the bottled milk of the bare bottle (the bottled milk without the heat shrink film bottle label) to the heat shrink film sleeve labeling machine 20, and the bottled milk of the bare bottle follows the bottled milk conveyor line 10 into between the two stop belts 502, and the buffer layers 505 of the two stop belts 502 are in contact with the bottled milk conveyor line 10. The outer walls of the bottled milk in the bare bottle conveyed on the conveying line 10 are in contact with each other, and stops are formed on the outer walls of the bare bottled milk, so as to prevent the heat shrink film on the outer wall of the bottled milk by the heat shrink film labeling machine 20 from moving downward. The auxiliary conveying motor 503 drives the two stop belts 502 to run at the same speed and in the same direction as the bottled milk conveying line 10, and conveys the bottled milk with the heat shrink film bottle label to the heat shrink film pre-forming device 40. During the conveying process to the heat shrink film pre-forming device 40, the two stop belts 502 always keep in contact with the outer walls of the bottled milk, so as to keep the height limit of the heat shrink film bottle label on the bottled milk, until the bottled milk is transferred into the heat shrink film pre-forming device 40. The buffer layer 505 has the characteristic of flexible shrinkage.During the process of being fed into the heat shrink film pre-forming device 40, the buffer layer 505 is squeezed on the outer wall of the bottled milk to form an adaptive deformation, and can be in close contact with the outer wall of the bottled milk being transported, and will not squeeze the outer wall of the bottled milk. After the bottled milk with the heat shrink film bottle label is pre-formed by the heat shrink film pre-forming device 40, it is transported by the bottled milk conveyor line 10 to the heat shrink film forming machine 30 for final forming.

[0028] Please see Figure 6 Furthermore, the limiting bracket 501 is fixed on both sides of the bottled milk conveying line 10 by adjusting screws 506. The height of the limiting bracket 501 can be adjusted by adjusting the height of the adjusting screws 506. The height of the stop belt 502 can be adjusted by adjusting the limiting bracket 501, so as to limit the height of the heat shrink film bottle label according to different process requirements.

[0029] Please see Figure 3 , Figure 5 , Figure 6 Further, an auxiliary sleeve labeling device 60 is respectively arranged on both sides of the bottled milk conveying line 10 between the heat shrinkable film sleeve labeling machine 20 and the heat shrinkable film pre-forming device 40, and the two auxiliary sleeve labeling devices 60 respectively include an auxiliary sleeve labeling brush 601, an auxiliary sleeve labeling motor 602 and a mounting frame 603. The mounting frames 603 of the two auxiliary sleeve labeling devices 60 are respectively arranged on the upper ends of the two limit brackets 501, and the auxiliary sleeve labeling brushes 601 of the two auxiliary sleeve labeling devices 60 are respectively arranged transversely on the two mounting frames 603, and the two mounting frames 603 are transversely arranged directly above the bottled milk conveying line 10, and the axial directions of the two auxiliary sleeve labeling brushes 601 are both oriented Toward the conveying direction of the bottled milk conveyor line 10 and aligned with each other, the auxiliary labeling motors 602 of the two auxiliary labeling devices 60 are respectively arranged on two mounting frames 603, and are respectively connected to the shafts of the two auxiliary labeling brushes 601. The auxiliary labeling motors 602 respectively drive the two auxiliary labeling brushes 601 to rotate from top to bottom along the outer side wall of the bottled milk conveyed on the bottled milk conveyor line 10. The auxiliary labeling brushes 601 are flexible brushes made of rubber. During the rotation process, the brush body contacts the heat shrinkable film bottle label sleeved on the outer side wall of the bottled milk to assist in moving the heat shrinkable film sleeved on the outer side wall of the bottled milk downward along the outer side wall of the bottled milk, so that the heat shrinkable film bottle label is sleeved in place.

[0030] Please continue to see Figure 3 , Figure 5 , Figure 6The heat shrink film pre-forming device 40 includes a pre-forming channel 401 for bottled milk to pass through, the pre-forming channel 401 is set on the bottled milk conveyor line 10, and the stop belts 502 of the two limit stoppers 50 pass through the two sides of the pre-forming channel 401. Strip electric heaters 402 are arranged on both sides of the pre-forming channel 401. The strip electric heaters 402 are a ceramic heating plate or a nickel-chromium alloy heating wire with a strip structure. The strip electric heaters 402 are arranged transversely along the conveying direction of the bottled milk conveyor line 10. The strip electric heaters 402 are arranged on the stop belts. 502 is above and close to the stopper belt 502. When the bottled milk with the heat shrink film bottle label is conveyed by the bottled milk conveyor line 10 through the pre-molding channel 401, the strip electric heaters 402 on both sides of the pre-molding channel 401 heat the lower ends of the heat shrink film bottle label on the bottled milk to shrink it and fit it on the outer wall of the bottled milk for pre-molding, thereby preventing the heat shrink film bottle label from moving. The bottled milk is then conveyed by the bottled milk conveyor line 10 to the heat shrink film forming machine 30, and the heat shrink film forming machine 30 performs final heat shrink molding on the heat shrink film bottle label on the bottled milk.

[0031] Please continue to see Figure 3 , Figure 5 , Figure 6 Further, a bottled milk flow control roller 70 and a guide plate 71 are arranged on the bottled milk conveyor line 10 in front of the input port of the heat shrink film sleeve labeling machine 20. The bottled milk flow control roller 70 is rotatably arranged on one side above the conveying surface of the bottled milk conveyor line 10. The axial direction of the bottled milk flow control roller 70 faces the conveying direction of the bottled milk conveyor line 10. The outer side wall of the bottled milk flow control roller 70 is provided with a positive thread groove 72 for pushing and conveying bottled milk along its circumferential direction. The pitch of the positive thread groove 72 is a preset distance. The guide plate 71 is arranged on the other side above the conveying surface of the bottled milk conveyor line 10. The guide plate 71 is extended along the conveying direction of the bottled milk conveyor line 10, and is connected to the bottled milk conveyor line 10. The axial direction of the milk flow control roller 70 is parallel, and the side wall of the guide plate 71 is directly opposite to the bottled milk flow control roller 70. A push channel for bottled milk to enter is formed between the positive thread groove 72 on the bottled milk flow control roller 70 and the guide plate 71. A flow control motor 73 is arranged at the axial end of the bottled milk flow control roller 70. The flow control motor 73 drives the bottled milk flow control roller 70 to rotate positively toward the guide plate 71, and the positive thread groove 72 is used to roll the bottled milk conveyed on the bottled milk conveyor line 10 into the push channel in sequence. The flow control motor 73 is a servo motor. The rotation speed of the bottled milk flow control roller 70 is controlled by the flow control motor 73, and the bottled milk is evenly spaced toward the direction of the heat shrink film sleeve labeling machine 20.

[0032] Furthermore, an auxiliary flow control brush 74 is provided on the bottled milk conveyor line 10 in front of the bottled milk flow control roller 70. There are two auxiliary flow control brushes 74, which are relatively arranged on both sides of the bottled milk conveyor line 10. When the bottled milk conveyed on the bottled milk conveyor line 10 passes through the auxiliary flow control brushes 74, the two auxiliary flow control brushes 74 are in frictional contact with both sides of the outer wall of the bottled milk conveyed on the bottled milk conveyor line 10, and the friction force is used to slow down the conveying speed of the bottled milk on the bottled milk conveyor line 10, so that the bottled milk conveyed on the bottled milk conveyor line 10 forms a buffer at the auxiliary flow control brush 74, and passes through the auxiliary flow control brush 74 in sequence under the squeezing force of the bottled milk conveyed subsequently. By controlling the flow of the bottled milk by the auxiliary flow control brushes 74, the accumulation of the bottled milk to be labeled at the inlet of the bottled milk flow control roller 70 can be reduced.

[0033] Please see Figure 8 In a preferred embodiment, a capping device 80 and an air-drying device 90 are further provided on the bottled milk conveying line 10. The capping device 80 is a fully automatic capping machine, which is arranged in front of the auxiliary flow control brush 74. The air-drying device 90 is an air-drying machine, which is arranged in front of the capping device 80. The bottled milk conveying line 10 conveys the bottled milk to the air-drying device 90, and the outer surface of the bottled milk is air-dried by the air-drying device 90. The air-dried bottled milk is further conveyed by the bottled milk conveying line 10 to the capping device 80, and the bottled milk is capped and packaged by the capping device 80. The capped and packaged bottled milk is further conveyed by the bottled milk conveying line 10 to the direction of the heat shrink film sleeve labeling machine 20 to be sleeved with a heat shrink film bottle label.

[0034] Please continue to see Figure 8 Furthermore, a carton sealing device 100 is provided at the output end of the bottled milk conveyor line 10. The carton sealing device 100 is a fully automatic carton sealing machine. The bottled milk with the heat shrink film bottle label is shrink-formed by the heat shrink film forming machine 30 and then directly input into the carton sealing device 100 by the bottled milk conveyor line 10, and the carton is sealed by the carton sealing device 100.

[0035] What is disclosed above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A bottled milk packaging system, comprising a bottled milk conveyor line, a heat shrinkable film sleeve labeling machine and a heat shrinkable film forming machine sequentially mounted on the bottled milk conveyor line, characterized in that: A heat shrink film pre-forming device is set up between the heat shrink film sleeve labeling machine and the heat shrink film forming machine. A limit stopper is respectively arranged on both sides of the conveying surface of the bottled milk conveying line. The two limit stops are arranged opposite to each other and extend in parallel along the conveying direction of the bottled milk conveying line. One end of the two limit stops extends to the input port of the heat shrink film sleeve labeling machine, and the other end of the two limit stops extends into the heat shrink film pre-forming device. The two limit stops contact the two sides of the outer wall of the bottled milk entering the heat shrink film sleeve labeling machine to form a stopper on the outer wall of the bottled milk to limit the heat shrink film bottle label sleeved by the heat shrink film sleeve labeling machine on the outer wall of the bottled milk, and run at the same speed and direction as the bottled milk conveying line to assist the bottled milk conveying line to transport the bottled milk sleeved with the heat shrink film bottle label to the heat shrink film pre-forming device for pre-forming.

2. The bottled milk packaging system according to claim 1, characterized in that: Each of the limit stoppers comprises a limit bracket, a stop belt, an auxiliary transmission motor and a plurality of guide wheels. The limit bracket is extended in parallel with the conveying direction of the bottled milk conveyor line. The guide wheels are arranged on the side of the limit bracket facing the bottled milk conveyor line and are arranged at intervals along the length direction of the limit bracket. The axial direction of each guide wheel is vertically arranged and has the same height. The guide wheel arranged at one end of the limit bracket is located at the input port of the heat shrink film sleeve labeling machine, and the guide wheel arranged at the other end of the limit bracket is located at the output end of the heat shrink film pre-forming device. The stop belt is annularly sleeved on the guide wheels at both ends of the limit bracket along the length direction of the limit bracket. The conveying motor is arranged on the limit bracket and is connected with the guide wheel shaft located at one end of the limit bracket to drive the guide wheel to drive the stop belt to run at the same speed and in the same direction as the bottled milk conveying line. The stop belts on the two relatively arranged limit stoppers form a channel for the bottled milk to pass through between the input port of the heat shrink film sleeve labeling machine and the output end of the heat shrink film pre-forming device, and contact with both sides of the outer wall of the bottled milk conveyed on the bottled milk conveying line to form a stop on the outer wall of the bottled milk to limit the heat shrink film bottle label sleeved by the heat shrink film sleeve labeling machine on the outer wall of the bottled milk, so that it maintains a preset height on the outer wall of the bottled milk and enters the heat shrink film pre-forming device for pre-forming.

3. The bottled milk packaging system according to claim 2, characterized in that: The height of the limiting bracket is a preset height, and the height is adjustable.

4. The bottled milk packaging system according to claim 2, characterized in that: A flexible buffer layer is arranged on the outer side walls opposite to each other of the two stop belts.

5. The bottled milk packaging system according to any one of claims 2 to 4, characterized in that: An auxiliary labeling device is respectively arranged on both sides of the bottled milk conveying line between the heat shrinkable film labeling machine and the heat shrinkable film pre-forming device, and the two auxiliary labeling devices respectively include an auxiliary labeling brush, an auxiliary labeling motor and a mounting frame. The mounting frames of the two auxiliary labeling devices are respectively arranged on the upper ends of the two limit brackets, and the auxiliary labeling brushes of the two auxiliary labeling devices are respectively arranged on the two mounting frames transversely, and are transversely arranged just above the bottled milk conveying line through the two mounting frames. The axial directions of the two auxiliary labeling brushes are both oriented to the conveying direction of the bottled milk conveying line and are aligned with each other. The auxiliary labeling motors of the two auxiliary labeling devices are respectively arranged on the two mounting frames and are respectively connected to the two auxiliary labeling brush shafts. The auxiliary labeling motors respectively drive the two auxiliary labeling brushes to rotate from top to bottom along the outer side wall of the bottled milk conveyed on the bottled milk conveying line, so as to assist the heat shrinkable film bottle label sleeved by the heat shrinkable film labeling machine on the outer wall of the bottled milk to move downward into place along the outer side wall of the bottled milk.

6. The bottled milk packaging system according to claim 5, characterized in that: The heat shrink film pre-forming device includes a pre-forming channel for bottled milk to pass through, the pre-forming channel is set up on the bottled milk conveyor line, the stop belts of the two limit stoppers pass through the two sides of the pre-forming channel, strip electric heaters are arranged opposite to each other on both sides of the pre-forming channel, the strip electric heaters are arranged transversely along the conveying direction of the bottled milk conveyor line, the strip electric heaters are arranged above the stop belts and close to the stop belts to pre-shrink and shape the two sides of the lower end of the heat shrink film bottle label sleeved on the bottled milk.

7. The bottled milk packaging system according to claim 6, characterized in that: A bottled milk flow control roller and a guide plate are arranged in front of the input port of the heat shrink film sleeve labeling machine on the bottled milk conveyor line. The bottled milk flow control roller is rotatably arranged on one side above the conveying surface of the bottled milk conveyor line. The axial direction of the bottled milk flow control roller faces the conveying direction of the bottled milk conveyor line. A positive thread groove for pushing and conveying bottled milk is opened on the outer side wall of the bottled milk flow control roller along its circumference. The pitch of the positive thread groove is a preset distance. The guide plate is arranged on the other side above the conveying surface of the bottled milk conveyor line. The guide plate moves along the bottled milk conveyor line. The conveying direction of the milk conveying line is extended and arranged parallel to the axial direction of the bottled milk flow control roller, and the side wall of the guide plate is directly opposite to the bottled milk flow control roller. A push channel for the bottled milk to enter is formed between the positive thread groove on the bottled milk flow control roller and the guide plate. A flow control motor is arranged at the axial end of the bottled milk flow control roller. The flow control motor drives the bottled milk flow control roller to rotate in the positive direction toward the guide plate, so as to roll the bottled milk conveyed on the bottled milk conveying line into the push channel in sequence, and transmit the bottled milk to the direction of the heat shrink film sleeve labeling machine at equal intervals.

8. The bottled milk packaging system according to claim 7, characterized in that: An auxiliary flow control brush is arranged in front of the bottled milk flow control roller on the bottled milk conveyor line. There are two auxiliary flow control brushes, which are arranged on both sides of the bottled milk conveyor line relatively. The two auxiliary flow control brushes are in friction contact with both sides of the outer wall of the bottled milk conveyed on the bottled milk conveyor line, and the friction force is used to slow down the conveying speed of the bottled milk on the bottled milk conveyor line to control the flow of the bottled milk.

9. The bottled milk packaging system according to claim 8, characterized in that: A capping device and an air-drying device are also provided on the bottled milk conveyor line. The capping device is arranged in front of the auxiliary flow control brush, and the air-drying device is arranged in front of the capping device. The bottled milk conveyor line conveys the bottled milk to the air-drying device, and the outer surface of the bottled milk is air-dried by the air-drying device. The air-dried bottled milk is further conveyed by the bottled milk conveyor line to the capping device, and the bottled milk is capped and packaged by the capping device. The capped and packaged bottled milk is further conveyed by the bottled milk conveyor line to the direction of the heat shrink film sleeve labeling machine to be sleeved with heat shrink film bottle labels.

10. The bottled milk packaging system according to claim 9, characterized in that: A box sealing device is also provided at the output end of the bottled milk conveying line. The bottled milk after shrinkage molding by the heat shrinkable film molding machine is input into the box sealing device through the bottled milk conveying line and is sealed by the box sealing device.

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