A sleeving device adapted to a sleeving machine production line

Abstract

The utility model discloses a kind of sleeve labeling devices suitable for sleeve labeling machine production line, it is related to packaging bottle production technical field, including the sleeve labeling assembly and conveying assembly being arranged along plumb direction, the conveying assembly includes the plate chain of cyclic reciprocating motion;The sleeve labeling assembly includes the first frame being arranged at plate chain, first frame is provided with the guide column being arranged along plumb direction in, first frame top is provided with the feeding element for conveying label to guide column, two groups of driving wheels are provided in first frame, and two driving wheels are separately arranged in the both sides of guide column and are all contacted with the label outside guide column, to when bottle body moves to below guide column, two driving wheels can be synchronously rotated to be used to add downward motion trend to label.The utility model discloses by abandoning conventional transverse sleeve labeling mode, and using vertical sleeve labeling mode, sleeve labeling sleeve setting direction is along label gravity direction, so that sleeve labeling process is smooth and silky, and resistance is small.

Description

Technical Field

[0001] This utility model relates to the field of packaging bottle production technology, specifically to a labeling device suitable for labeling machine production lines. Background Technology

[0002] Existing labeling equipment is a type of packaging machinery used to apply shrink film labels to bottles or other containers. A typical labeling machine includes a labeling assembly, a shrink assembly, and a conveying assembly for transporting bottles from the labeling station to the shrink assembly. The working process is as follows: the conveying assembly transports the bottles to the labeling station. During this transport, sensors and other components detect the bottle's position. Then, the labeling assembly performs steps such as label feeding, positioning, cutting, and injection to accurately place the label on the bottle. Next, the conveying assembly transports the bottle from the labeling station to the shrink assembly, where the bottle is shrunk to ensure the label adheres tightly to the bottle surface, achieving both aesthetic appeal and anti-counterfeiting effects.

[0003] A search revealed a patent document with authorization announcement number CN220810110U that discloses a horizontal labeling machine. This machine uses a labeling unit to slip labels onto the packaging area of ​​horizontally placed bottles, thus achieving labeling processing.

[0004] However, because the bottle is placed horizontally, the label can only be applied horizontally to the outside of the bottle. This horizontal movement of the label is opposite to the direction of its own gravity, so the interface may be misaligned or shifted during the application process, causing deformation and resulting in greater resistance during the application process. Utility Model Content

[0005] The purpose of this utility model is to solve the problems in the prior art by proposing a labeling device suitable for labeling machine production lines. This device abandons the conventional horizontal labeling method and adopts a vertical labeling method. The labeling direction is along the direction of the label's gravity, which makes the labeling process smooth and silky with low resistance.

[0006] To solve the above problems, this utility model provides the following technical solution:

[0007] A labeling device adapted to a labeling machine production line includes a labeling assembly and a conveying assembly arranged vertically, wherein the conveying assembly includes a plate chain that performs a reciprocating motion.

[0008] The labeling assembly includes a first frame located at the plate chain, a guide post arranged vertically within the first frame, a feeder for feeding labels to the guide post at the top of the first frame, and two sets of drive wheels located within the first frame, with the two drive wheels positioned on both sides of the guide post and in contact with the label outside the guide post, so that when the bottle moves to below the guide post, the two drive wheels can rotate synchronously to apply a downward movement tendency to the label.

[0009] As a further embodiment of this invention, the device also includes a pressing component located downstream of the labeling component on the plate chain.

[0010] As a further embodiment of this utility model: the pressing assembly includes a third frame located at the plate chain, and a pressing plate that can reciprocate within the travel path of the bottle is provided on the third frame for pressing down on the label protruding from the bottle.

[0011] As a further aspect of this invention, the device also includes:

[0012] The bottle holder consists of two sets of sub-molds with grooves. The two sub-molds are symmetrically fixed on two chain plates of the plate chain, so that the two sub-molds have a closed state and an open state and can switch between the two states.

[0013] The positioning key is located on the sub-mold at the leading edge of the conveying direction, and one side of it is located inside the groove cavity;

[0014] The limiting groove is adapted to the shape of the protruding part of the bottle mouth and is recessed at the top of the sub-mold;

[0015] When the two molds are in the closed state, the two cavities enclose a storage cavity for inserting the bottle neck. The side of the positioning key forms a guide rail for the directional sliding of the through groove, and the limiting groove is used to support and limit the protrusion. When the two molds are in the open state, the mold located at the leading edge of the conveying direction is tilted, and the bottle body is tilted in the same way by the side of the positioning key to achieve material dropping.

[0016] As a further embodiment of this utility model: the positioning key is designed to protrude from the side of the cavity, and the guide rail is arranged along the length of the positioning key.

[0017] As a further embodiment of this utility model, the end of the guide rail near the opening of the storage cavity has a sharp chamfered design.

[0018] As a further embodiment of this utility model: the limiting groove is a split design, which is composed of a first groove and a second groove spliced ​​together, and the first groove and the second groove are respectively provided on two sub-molds.

[0019] As a further embodiment of this utility model: the joint ends of the two sub-molds are both recessed and provided with mounting grooves, the sum of the groove depths of the two mounting grooves is equal to the thickness of the positioning key, so that when the positioning key is installed on the corresponding sub-mold, the positioning key is in the center position between the two sub-molds.

[0020] As a further embodiment of this utility model: a support rod is provided at the end of the shrinking component on the plate chain, and a horizontally arranged stop bar is provided on the support rod. The stop bar is located within the movement path of the bottle body. When the two molds are in the open state and the bottle body is tilted by the guide rail, the stop bar can block the bottle body so that the bottle mouth of the bottle body can be separated from the guide rail.

[0021] As a further embodiment of this utility model, the positioning key is detachably mounted on the mounting groove of the sub-mold.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The design employs a vertically arranged labeling assembly in conjunction with a circulating plate chain conveyor system, abandoning the conventional horizontal labeling method in favor of a vertical one. The labeling direction follows the direction of the label's gravity, resulting in a smooth and effortless labeling process with minimal resistance. Simultaneously, the combination of guide columns and dual drive wheels ensures precise vertical label transport. When the bottle moves below the guide columns, the two drive wheels rotate synchronously, generating a uniform downward force that allows the label to be smoothly and accurately applied to the bottle. This design not only improves labeling accuracy but also enables continuous automated production, significantly enhancing operational efficiency.

[0024] 2. By adding a pressing component downstream of the labeling process, a complete labeling-shaping process is formed. This layout design allows the labels to immediately enter the shaping stage after being applied, preventing the labels from shifting or lifting during transportation and ensuring the smooth progress of subsequent processes.

[0025] 3. The reciprocating motion of the pressure plate is precisely coordinated with the rhythm of the bottle's movement, applying appropriate downward pressure to the protruding label area, effectively eliminating label wrinkles or curling edges. This active shaping mechanism has good adaptability and can handle labels of different materials and sizes, improving the consistency of product appearance quality. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of the new packaging bottle structure of this utility model. Figure 1 ;

[0028] Figure 2 This is a schematic diagram of the new packaging bottle structure of this utility model. Figure 2 ;

[0029] Figure 3 This is a schematic diagram of the two-module split structure of this utility model;

[0030] Figure 4 yes Figure 3 A schematic diagram of the exploded structure;

[0031] Figure 5 This is a schematic diagram of the two molds in the mold-closing state of this utility model;

[0032] Figure 6 This is a top view of the two molds of this utility model in the mold-closed state;

[0033] Figure 7 This is a schematic diagram of the three-dimensional structure of the plate chain of this utility model;

[0034] Figure 8 This is a three-dimensional structural diagram of two molds mounted on a plate chain according to this utility model;

[0035] Figure 9 This is a schematic diagram of the labeling production line structure of this utility model;

[0036] Figure 10 yes Figure 9 Local structure diagram Figure 1 ;

[0037] Figure 11 yes Figure 9 Local structure diagram Figure 2 ;

[0038] Figure 12 yes Figure 9 Local structure diagram Figure 3 ;

[0039] Figure 13 yes Figure 9 Local structure diagram Figure 4 ;

[0040] Figure 14 This is a schematic diagram showing the structure where the label is not fully attached to the bottle.

[0041] Figure 15 This is a side view schematic diagram of the two sets of steam pipes of this utility model.

[0042] In the picture:

[0043] 101. Packaging bottle body; 102. External thread; 103. Through groove; 104. Annular flange; 105. Protrusion;

[0044] 1. Labeling assembly; 2. Shrink assembly; 3. Conveying assembly; 301. Plate chain; 3011. Chain plate; 4. Bottle holder; 5. Positioning key; 6. Limiting groove; 7. Guide rail; 8. Mounting cavity; 9. Support rod; 10. Stop bar; 11. First frame; 12. Guide column; 13. Feeding component; 14. Drive wheel; 15. Second frame; 16. Steam pipe; 1601. Air outlet; 17. Pressing assembly; 18. Third frame; 19. Pressing plate; 20. Drive source; 21. Transfer slide; 22. Bolt; 23. Nut; a. Bottle body. Detailed Implementation

[0045] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0046] Example 1:

[0047] like Figures 9-15 As shown, an automated labeling production equipment includes a labeling component 1 for labeling bottle a, a shrinking component 2 for heat shrinking the labeled bottle a, and a conveying component 3 for conveying and linking the two. The conveying component 3 is used to convey the bottle a to be labeled to the labeling station of the labeling component 1. After the labeling component 1 completes the labeling work on the bottle a, the conveying component 3 then conveys the bottle a to the shrinking station of the shrinking component 2. That is, the upstream section of the conveying component 3 is located at the labeling component 1, and the downstream section is located at the shrinking component 2.

[0048] Regarding the aforementioned labeling component 1, the labeling component 1 can be a conventional component from the prior art, or it can be a labeling component 1 proposed in this application. This labeling component 1 includes a first frame 11 located upstream of the conveying component 3. A feeding element 13 is provided on the top outer wall of the first frame 11, and a guide post 12 is provided on the top inner wall of the first frame 11. The feeding element 13 supplies labels to the guide post 12, and the supplied labels are fitted onto the outside of the guide post 12. A labeling station is formed directly below the guide post 12. Two sets of opposing drive wheels 14 are also provided inside the first frame 11. Both drive wheels 14 can be driven by corresponding motors. The two drive wheels 14 are located on both sides of the guide post 12 and are in contact with the labels outside the guide post 12. When bottle a is conveyed to the labeling station via the conveying component 3, both drive wheels 14 rotate synchronously to apply a downward movement trend to the label, allowing the label to be accurately fitted onto the bottle body of bottle a and completely cover the bottle body. Figure 10As shown, the two drive wheels 14 rotate in the following directions: the drive wheel 14 on the left rotates clockwise, and the drive wheel 14 on the right rotates counterclockwise.

[0049] It should be noted that during this labeling process, the conveying component 3 can operate without stopping. When it moves the bottle a to the labeling station, the two drive wheels 14 quickly apply a downward force to the label, causing the label to be applied to the bottle a in a very short time. Meanwhile, the feeding component 13 is a conventional component in the prior art and will not be described in detail here.

[0050] Regarding the aforementioned configuration of the shrinkage assembly 2, the shrinkage assembly 2 can utilize conventional components from the prior art, or it can employ the shrinkage assembly 2 proposed in this application. This shrinkage assembly 2 includes a second frame 15 located downstream of the conveying assembly 3. Two sets of parallel steam pipes 16 are arranged within the second frame 15. Each of the two steam pipes 16 has an outlet 1601 on its inner side, through which steam can be ejected. Figure 12 As shown, the air outlet 1601 is located on the side of the steam pipe 16 facing the paper. Figure 15 From the side view shown, the area between the two steam pipes (16) forms a passageway, within which a steam atmosphere is created. Furthermore... Figure 12 As shown, the walking channel has an inclined layout from left to right. Therefore, when bottle a is conveyed from left to right, the walking channel with the above layout can perform gradual heat shrinking treatment on the label on the bottle from bottom to top along the direction of travel.

[0051] This layout of the walking channel is designed to match the direction of travel of bottle a. By gradually shrinking the label on the bottle from bottom to top, it ensures that the label can fit snugly against the bottle, achieving a comfortable viewing experience and perfect anti-counterfeiting effect.

[0052] Example 2:

[0053] like Figure 9 and Figure 11 As shown, based on the above-mentioned labeling component 1, shrinking component 2, and conveying component 3, during the labeling process, there may be instances where the label cannot completely cover the bottle body, for example, [the following occurs]. Figure 14 In the situation shown, the lower part of the bottle cannot be labeled. Therefore, this application provides a pressing component 17 on the conveying component 3 downstream of the labeling component 1. The pressing component 17 will be described below:

[0054] The pressing assembly 17 is used to press the material into place. Figure 14The label in the indicated state is pressed down so that it completely covers the bottle body, facilitating subsequent shrinkage processing. Specifically, the pressing assembly 17 includes a third frame 18 located at the conveying assembly 3. A pressure plate 19 is mounted on the third frame 18. The pressure plate 19 can reciprocate vertically. When the pressure plate 19 is in the lower position, it is in contact with the top of the bottle body. In this design, when the label on the bottle body is protruding after being processed by the labeling assembly 1, once the bottle body a moves below the pressure plate 19, the downward movement of the pressure plate 19 pushes the label downward. Due to the movement characteristic that the pressure plate 19 is only in contact with the top of the bottle body when it is in the lower position, the label is pushed to completely cover the bottle body, and the pressure plate 19 will not cause pressure damage to the top of the bottle body.

[0055] To achieve the reciprocating motion of the pressure plate 19, a drive source 20 can be provided on the third frame 18. The drive source 20 can be a conventional cylinder, hydraulic cylinder, electric push rod, etc., or a motor and a crank mechanism composed of connecting rods, etc.

[0056] Example 3:

[0057] To meet different production needs, manufacturers typically modify conventional bottle designs to create a new packaging bottle structure. Figure 1 and Figure 2 This paper shows a packaging bottle structure with corresponding structural improvements. Figure 1 and Figure 2 These figures represent two different perspectives. In the diagram, 101 represents the packaging bottle body, 102 represents the external thread protruding from the bottle mouth, 103 represents the through groove recessed on the external thread, and this through groove is arranged along the axis of the bottle mouth, 104 represents the annular flange protruding from the bottle mouth, and 105 represents the protrusion on the annular flange extending radially along the bottle mouth. Based on the proposed new bottle body a, simply setting a base on the conveying assembly 3 makes it difficult to limit and fix the irregularly shaped bottle mouth of the new bottle body a, easily causing the bottle body a to shake or shift position during conveying, resulting in the labeling and shrinking processes failing to perform properly. Therefore, this embodiment improves the design of the conveying assembly 3.

[0058] like Figures 3-8 As shown, the conveying assembly 3 includes a plate chain 301 and a bottle holder 4. The plate chain 301 can perform cyclic reciprocating motion, and a portion of the plate chain 301 can be composed of... Figure 7 As shown, the bottle holder 4 consists of two sets of sub-molds 401 with grooves, and the two sub-molds 401 are symmetrically arranged on the two chain plates 3011 of the plate chain 301. Figure 8The illustration shows two sets of molds 401 mounted on a plate chain 301. Here, the two sets of molds 401 are respectively mounted on two chain plates 3011 separated by a chain plate 3011. Of course, the specific mounting configuration can be adjusted according to actual conditions and is not subject to change. Figure 8 The installation is limited by the conditions shown.

[0059] Under normal conveying conditions, the two molds 401 are positioned on the plate chain 301. Figure 8 As shown, the two molds 401 are in a closed state, and the cavities of the two molds 401 together form a storage cavity for inserting the bottle neck. The opening of the storage cavity has a chamfered design. Figure 8 The direction of the middle arrow indicates the direction of travel of bottle a. When the two sub-molds 401 move to the end of the plate chain 301, the sub-mold 401 located at the forefront of the travel direction will first tilt. This state can be determined by... Figure 9 and Figure 13 To represent, Figure 13 In the two sub-molds 401 in the open mold state, the sub-mold 401 on the right can be represented as the sub-mold 401 located at the leading edge of the traveling direction. At this time, the two sub-molds 401 are in the open mold state, the shape of the placement cavity is broken, and the bottle mouth will move out from the bottle holder 4.

[0060] To ensure the bottle neck is stably restrained by the bottle holder 4 after being inserted into the storage cavity, this embodiment incorporates a positioning key 5 based on the through groove 103 on the new bottle body a. The positioning key 5 is located on the sub-mold 401 at the leading edge of the travel direction, with one side of the positioning key 5 positioned within the groove of the sub-mold 401. When the two sub-molds 401 are in the closed state, the side of the positioning key 5 protrudes into the storage cavity. This state can be achieved by… Figure 6 To illustrate, the existence of this side allows the through groove 103 to be fitted and oriented to slide during the process of placing the bottle opening from top to bottom into the storage cavity. This side can restrict the position of the bottle opening in the storage cavity, so that the bottle body a always remains stable on the bottle holder 4.

[0061] Based on the presence of the positioning key 5 on its side, when both sub-molds 401 are in the open mold state, since the positioning key 5 is located on the sub-mold 401 at the leading edge of the traveling direction, when the sub-mold 401 is in a pre-tilted state, the bottle body a can be moved to the same tilted state by relying on the side of the positioning key 5. This tilted state can be determined by... Figure 13 To illustrate, when the sub-mold 401 is tilted to a sufficiently large angle, the through groove 103 at the bottle mouth will slide off the side of the positioning key 5 and move out of the sub-mold 401.

[0062] To prevent bottle a from tilting too much with the sub-mold 401, making collection difficult, this embodiment includes a support rod 9 at the end of the plate chain 301. A horizontally arranged stop bar 10 is mounted on the support rod 9, located within the movement path of bottle a. When the two sub-molds 401 are in... Figure 13 When the mold is open and the bottle a is tilted relative to the side of the positioning key 5, the stop bar 10 can block the bottle body of the bottle a, so that the bottle mouth of the bottle a is disengaged from the side of the positioning key 5, thus achieving material dropping. At the same time, based on this material dropping design with a relatively small tilt angle, this embodiment has sufficient space to set a transfer slide 21 at the end of the plate chain 301, which is used to receive the dropped bottle a.

[0063] Specifically, the positioning key 5 is a one-piece protruding design on the side of the cavity, which forms a guide rail 7 along the length of the positioning key 5. Meanwhile, to ensure smooth insertion of the bottle neck slot 103 from top to bottom, the end of the guide rail 7 near the opening of the storage cavity is designed with a sharp chamfer. Figure 5 As shown, the top of the guide rail 7 has a sharp chamfered design, which guides the insertion of the through slot 103.

[0064] Furthermore, based on the design of the protrusion 105 of the new structure bottle body a, this embodiment can also open a limiting groove 6 at the top of the sub-mold 401. During the process of the bottle mouth being inserted into the storage cavity from top to bottom, in addition to using the side of the positioning key 5 to restrict the through groove 103 as mentioned above, the limiting groove 6 is also used to accommodate and limit the protrusion 105, so that the bottle mouth is restricted in multiple directions in the storage cavity, presenting a good stable state.

[0065] Preferably, the limiting groove 6 is positioned directly above the positioning key 5, forming a continuous positioning system that keeps the positioning of the bottle mouth protrusion 105 and the through groove 103 on the same vertical line. This optimized layout improves positioning accuracy, reduces the shaking of the bottle body a during transportation, and ensures process stability.

[0066] To facilitate proper material placement of the bottle body a on the sub-mold 401 in the open mold state, this embodiment features recessed mounting grooves 8 at the joint ends of both sub-molds 401. The sum of the depths of the two mounting grooves 8 is equal to the thickness of the positioning key 5, ensuring that the positioning key 5 is positioned centrally between the two sub-molds 401 when it is installed on the corresponding sub-mold 401. Therefore, in the open mold state, Figure 13 As shown, only half of the bottle opening is located in the cavity of the right sub-mold 401, which reduces the restriction of the sub-mold 401 on the bottle opening when the mold is open. This makes it easier for the bottle body to fall at a small tilt angle when the bottle body is blocked by the stop bar 10, as the slight shift of the center of gravity of the bottle body a can achieve this.

[0067] To further improve the material distribution of bottle body a, this embodiment is not limited to setting the limiting groove 6 as a single integral type, but rather sets it as a split type, with a first groove 601 and a second groove 602. The first groove 601 and the second groove 602 are respectively set on two sub-molds 401. Preferably, the first groove 601 is set on the sub-mold 401 located at the rear edge of the traveling direction, and the second groove 602 is set on the sub-mold 401 located at the front edge of the traveling direction. This design can be achieved by... Figure 3 To indicate. When in Figure 13 When the mold is open, only half of the bottle opening is located on the second slot 602 on the right side, which further reduces the restriction on the bottle opening in the mold-open state and facilitates subsequent material unloading.

[0068] Because different bottle bodies a have through grooves 103 of varying depths and widths at their openings, this embodiment sets the positioning key 5 on the sub-mold 401 as a detachable design. The detachable design can be any of the following methods: snap-fit, fastening, bonding, threaded connection, etc. Figure 4 As shown, taking a threaded connection as an example, the locating key 5 is installed at the corresponding position of the sub-mold 401 through the cooperation of bolt 22 and nut 23.

[0069] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A labeling device suitable for labeling machine production lines, characterized in that, It includes a label assembly (1) and a conveying assembly (3) arranged vertically, wherein the conveying assembly (3) includes a plate chain (301) that performs a reciprocating motion. The label assembly (1) includes a first frame (11) located at the plate chain (301). A guide post (12) arranged vertically is provided in the first frame (11). A feeder (13) for feeding labels to the guide post (12) is provided at the top of the first frame (11). Two sets of drive wheels (14) are provided in the first frame (11). The two drive wheels (14) are located on both sides of the guide post (12) and are in contact with the label outside the guide post (12). When the bottle (a) moves to below the guide post (12), the two drive wheels (14) can rotate synchronously to apply a downward movement trend to the label.

2. The labeling device adapted to a labeling machine production line according to claim 1, characterized in that, The device also includes a pressing assembly (17) located on the plate chain (301) downstream of the label assembly (1).

3. A labeling device suitable for labeling machine production lines according to claim 2, characterized in that, The pressing assembly (17) includes a third frame (18) located at the plate chain (301). The third frame (18) is provided with a pressing plate (19) that can reciprocate to the travel path of the bottle (a) for pressing down on the label protruding from the bottle (a).

4. A labeling device suitable for a labeling machine production line according to any one of claims 1-3, characterized in that, The device also includes: The bottle holder (4) is composed of two sets of sub-molds (401) with grooves. The two sub-molds (401) are symmetrically fixed on the two chain plates (3011) of the plate chain (301) so that the two sub-molds (401) have a closed state and an open state and can switch between the two states. The positioning key (5) is set on the sub-mold (401) located at the leading edge of the conveying direction, and one side of it is located inside the groove cavity; The limiting groove (6) is adapted to the shape of the bottle mouth protrusion (105) and recessed at the top of the sub-mold (401); When the two sub-molds (401) are in the closed state, the two cavities enclose a storage cavity for inserting the bottle mouth. The side of the positioning key (5) forms a guide rail (7) for the directional sliding of the through groove (103). The limiting groove (6) is used to support and limit the protrusion (105). When the two sub-molds (401) are in the open state, the sub-mold (401) located at the leading edge of the conveying direction is in an inclined state. The bottle body (a) is in the same inclined state as the side of the positioning key (5) to achieve material dropping.

5. A labeling device suitable for labeling machine production lines according to claim 4, characterized in that, The positioning key (5) is located on the side of the groove cavity with a protruding design, and the guide rail (7) is arranged along the length direction of the positioning key (5).

6. A labeling device suitable for labeling machine production lines according to claim 4, characterized in that, The guide rail (7) has a sharp chamfered design at the end near the opening of the storage cavity.

7. A labeling device suitable for labeling machine production lines according to claim 4, characterized in that, The limiting groove (6) is a split design, which is composed of a first groove (601) and a second groove (602), and the first groove (601) and the second groove (602) are respectively located on two sub-molds (401).

8. A labeling device suitable for labeling machine production lines according to claim 4, characterized in that, The joint ends of the two sub-molds (401) are recessed and provided with mounting grooves (8). The sum of the groove depths of the two mounting grooves (8) is equal to the thickness of the positioning key (5), so that when the positioning key (5) is installed on the corresponding sub-mold (401), the positioning key (5) is in the center position between the two sub-molds (401).

9. A labeling device suitable for labeling machine production lines according to claim 4, characterized in that, A support rod (9) is provided at the end of the shrinking component (2) on the plate chain (301). A horizontally arranged stop bar (10) is provided on the support rod (9). The stop bar (10) is located within the movement path of the bottle body (a). When the two molds (401) are in the open mold state and the bottle body (a) is tilted by the guide rail (7), the stop bar (10) can block the bottle body (a) so that the bottle mouth of the bottle body (a) is disengaged from the guide rail (7).

10. A labeling device suitable for a labeling machine production line according to claim 4, characterized in that, The positioning key (5) is detachably installed on the mounting cavity (8) of the sub-mold (401).

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