A labeling machine for logistics

Abstract

The present invention discloses a labeling machine for logistics, which includes a package conveying part and a label pasting part for pasting labels. A label pressing part for pressing the label onto the package is provided at the rear side of the label pasting part. The label pressing part includes a positioning plate that can move up and down. A top push rod that can slide up and down is provided on the positioning plate. The bottom of the top push rod is connected to a hot pressing plate through a ball pin assembly. The labeling machine includes a hot air supply module that supplies hot air to the hot pressing plate. An air delivery channel is provided on the positioning plate. One end of the air delivery channel is connected to the air delivery end of the hot air supply module. An air passage is provided on the top push rod. A distribution cavity and air holes are provided in the hot pressing plate. One end of the air passage is connected to the distribution cavity. A reset assembly for restoring the top push rod from the second state to the first state is provided on the positioning plate. In the first state, the other end of the air passage is misaligned with the air delivery channel. In the second state, the other end of the air passage is in communication with the air delivery channel, which can strengthen the pasting strength of the label while accommodating the height of the package.

Description

Technical Field

[0001] The present invention relates to the technical field of labeling machines, and in particular, to a labeling machine for logistics. Background Art

[0002] A labeling machine is a device that pastes rolls or stacks of self-adhesive labels on products or specified packages. The labeling machine is an indispensable part of the current packaging industry.

[0003] Currently, as Figure 1 shown, the labeling machine consists of a package conveying part 1001 and a label pasting part 1002. The package to be labeled is placed on the conveyor belt of the package conveying part 1001 and transported forward. When the package moves to the bottom of the label and release paper peeling position, the label is pressed onto the package by using a pressing roller 1003, thereby realizing the pasting of the self-adhesive label.

[0004] Nowadays, the shapes of logistics packages are various and different from regular packaging boxes. The heights of the packages themselves are different. If the traditional rolling cylinder 1003 is used to roll the label, the following problems will exist:

[0005] Problem 1: Different package heights result in some packages not being able to contact the bottom of the rolling cylinder 1003, and the label cannot be rolled.

[0006] Problem 2: The package is too high and is blocked by the rolling cylinder 1003 during the movement, hindering the flow of the package.

[0007] Problem 3: Plastic bag-type packaging bags are relatively soft. When the rolling cylinder 1003 rolls the label, the label is not firmly pasted.

[0008] Therefore, how to design a labeling machine that can be applicable to the label pasting of different types of logistics packages has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0009] In order to solve at least one technical problem mentioned in the background art, the purpose of the present invention is to provide a labeling machine for logistics to solve the problem that the label is not firmly pasted due to different heights of the packages.

[0010] To achieve the above purpose, the present invention provides the following technical solutions:

[0011] A labeling machine for logistics, comprising a package conveying part and a label pasting part for pasting labels. A label pressing part for pressing the label on the package is provided at the rear side of the label pasting part. The label pressing part includes a positioning plate that can move up and down. A top push rod that can slide up and down is provided on the positioning plate. The bottom of the top push rod is connected with a hot pressing plate through a ball pin assembly. The labeling machine includes a hot air supply module for supplying hot air to the hot pressing plate. An air delivery channel is provided on the positioning plate. One end of the air delivery channel is connected with the air delivery end of the hot air supply module. An air duct is provided on the top push rod. A distribution cavity and air holes are provided in the hot pressing plate. One end of the air duct is connected with the distribution cavity. A reset assembly for restoring the top push rod from the second state to the first state is provided on the positioning plate. In the first state, the other end of the air duct is misaligned with the air delivery channel. In the second state, the other end of the air duct is communicated with the air delivery channel.

[0012] Further, an accordion suction cup for adsorbing labels is installed at the bottom of the positioning plate. An air extraction module is provided on the labeling machine. The air extraction end of the air extraction module is communicated with the inner cavity of the accordion suction cup.

[0013] Further, the accordion suction cup is sleeved outside the hot pressing plate. In the first state, the bottom of the accordion suction cup is lower than the bottom of the hot pressing plate.

[0014] Further, a through guide hole is provided on the positioning plate. The outer wall of the top push rod is slidably connected with the guide hole.

[0015] Further, a top push plate is fixedly provided at the top of the top push rod. The reset assembly includes a spring. The spring is sleeved outside the top push rod and one end of the spring is fixed to the top push plate, and the other end of the spring is fixedly connected with the upper wall of the positioning plate.

[0016] Further, the suction force of the air extraction module is less than the elastic force of the spring in the second state.

[0017] Further, the ball pin assembly includes a ball head and a ball groove. The ball head is fixedly installed at the bottom of the top push rod. The ball groove is provided at the top of the hot pressing plate. The ball head is inserted into the ball groove to form a ball pin pair.

[0018] Further, the air holes include a first air hole and a second air hole. The first air hole communicates the distribution cavity with the bottom wall of the hot pressing plate. The second air hole communicates the distribution cavity with the side wall of the hot pressing plate.

[0019] Further, the air duct includes an air inlet and an air outlet. The air outlet is connected with the distribution cavity through a connecting pipe. In the first state, the air inlet is misaligned with the air delivery channel. In the second state, the air inlet is communicated with the air delivery channel.

[0020] Furthermore, a guiding groove is provided on the side wall of the guiding hole along the thickness direction of the positioning plate, and a guiding rib inserted into the guiding groove is provided on the outer wall of the ejector rod.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention drives the ironing plate to move through the positioning plate that can move up and down, and pushes the label onto the package to realize the pasting of the label;

[0022] Since the ironing plate and the ejector rod are connected through a ball pin assembly, when the ironing plate pastes the label, the ironing plate can be adjusted adaptively in angle according to the shape of the package, making the adhesive strength of the label more uniform;

[0023] During the label pasting process, the up and down movement of the ejector rod and the expansion and contraction of the reset assembly can adjust the pressure of the ironing plate on the package, preventing damage to the package caused by excessive pressure during the label pasting process;

[0024] When the label is pasted, the hot air supply module conveys hot air to the ironing plate to heat the label, improving the viscosity of the glue on the label and strengthening the firmness of the label pasting. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the prior art;

[0026] Figure 2 is a schematic diagram of the overall structure of the present invention;

[0027] Figure 3 is a front view of the present invention;

[0028] Figure 4 is a schematic diagram of the structure of the label pressing part of the present invention;

[0029] Figure 5 is an exploded view of the label pressing part;

[0030] Figure 6 is a cross-sectional view of the label pressing part;

[0031] Figure 7 is a schematic diagram of the structure in the label adsorption state;

[0032] Figure 8 is a cross-sectional view in the hot air supply state;

[0033] Figure 9 is a cross-sectional view of the angle adaptability adjustment of the ironing plate;

[0034] Figure 10 is a cross-sectional view of the air extraction channel of the air extraction module;

[0035] Figure 11It is a sectional view of the positioning plate;

[0036] Figure 12 It is Figure 8 an enlarged structural schematic diagram of A in

[0037] In the figure: 1001, the package conveying part; 1002, the label pasting part; 1003, the rolling cylinder; 10, the mounting plate; 11, the conveying frame; 12, the conveyor belt; 21, the label storage box; 22, the conveying roller; 23, the guiding roller; 24, the peeling plate; 25, the winding roller; 3, the label pressing part; 31, the positioning plate; 301, the air delivery channel; 302, the air extraction channel; 303, the guiding hole; 3031, the guiding groove; 32, the cylinder; 33, the bellows suction cup; 34, the top push rod; 341, the top push plate; 342, the air duct; 3421, the air inlet; 3422, the air outlet; 343, the ball head; 344, the limiting plate; 345, the guiding slide rib; 35, the touch pressure sensor; 36, the ironing plate; 361, the ball groove; 362, the distribution cavity; 363, the first air hole; 364, the second air hole; 37, the spring; 4, the air extraction module; 5, the hot air supply module; 6, the laser sensor. Specific embodiments

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] This embodiment provides a labeling machine for logistics, which mainly improves the original rolling cylinder 1003 to solve the situation that the distance between the package and the rolling cylinder 1003 is too large, resulting in the label not being able to be pasted, and improves the applicability of the existing labeling machine.

[0040] The situation of the existing labeling machine is as Figure 1 shown. Among them, the labeling machine includes a package conveying part 1001 and a label pasting part 1002. When the label is separated from the bottom release paper, the rolling cylinder 1003 is used to roll the label onto the package; this kind of label pasting is applicable to the situation where the heights of the packages are the same, so as to improve the label pasting efficiency. If the height of the package is too low, the rolling cylinder 1003 cannot abut against the package, and thus the peeled label cannot be rolled onto the package. If the height of the package is too high, at this time, the package is likely to collide with the rolling cylinder 1003, and the rolling cylinder 1003 restricts the continuous movement of the package, resulting in the accumulation of the package at the position of the rolling cylinder 1003.

[0041] In view of the above situation, in this embodiment, the improvement is mainly carried out on the part of the rolling cylinder 1003.

[0042] The current situation of the labeling machine is as follows Figure 2 and Figure 3 As shown, the package conveying section 1001 includes a conveying rack 11, on which a conveyor belt 12 is installed, and the conveyor belt 12 is used to convey the packages.

[0043] Among them, the label pasting section 1002 is as shown in Figure 3 As shown, it includes a mounting plate 10, on which a label storage box 21 for carrying labels, a conveying roller 22 for driving the labels to move, a guiding roller 23 for assisting the labels to move, a peeling plate 24 for separating the labels and the release paper, and a winding roller 25 for winding the release paper. The self-adhesive labels pass through the conveying roller 22, the guiding roller 23, and the peeling plate 24 in sequence from the label storage box 21, and then the release paper after peeling the labels is wound around the winding roller 25.

[0044] In this embodiment, in order to press the peeled label onto the package, a label pressing section 1003 is provided at the rear of the label pasting section 1002. Among them, the label pressing section 1003 includes a positioning plate 31 that can move up and down and a driving mechanism for driving the positioning plate 31 to move up and down. In this embodiment, as shown in Figure 4 As shown, the driving mechanism is a cylinder 32, where the cylinder 32 is fixedly installed on the mounting plate 10, and the telescopic rod of the cylinder 32 is fixedly connected to the positioning plate 31.

[0045] Through the above settings, the telescopic rod of the cylinder 32 drives the lifting of the positioning plate 31. At this time, the positioning plate 31 pushes and presses down the peeled label, and pastes the label on the package.

[0046] In order to be able to control the extension of the telescopic rod of the cylinder 32, in this embodiment, as shown in Figure 2 and Figure 3 As shown, a laser sensor 6 is fixedly installed at the bottom of the mounting plate 10, a central control unit is installed on the mounting plate 10, and the central control unit is electrically connected to both the cylinder 32 and the laser sensor 6; when the package flows through the front side of the laser sensor 6, the laser sensor 6 generates an electrical signal and transmits it to the central control unit, and the central control unit controls the telescopic rod of the cylinder 32 to extend outwards, thereby pushing the positioning plate 31 downwards to achieve label pasting.

[0047] Since the heights of the packages are different, in order to prevent the label from separating from the positioning plate 31 when the positioning plate 31 pushes the label downwards; therefore, in this embodiment, as shown in Figure 2 and Figure 4 As shown, a bellows suction cup 33 is installed at the bottom of the positioning plate 31, and an air extraction module 4 is fixedly installed on the mounting plate 10, and the air extraction end of the air extraction module 4 is communicated with the inner cavity of the bellows suction cup 33.

[0048] Specifically, as Figure 4 and Figure 11 shown, an air extraction channel 302 communicating with the inner cavity of the bellows suction cup 33 is provided on the positioning plate 31, and one end of the air extraction channel 302 is connected to the air extraction end of the air extraction module 4 through a connecting pipe. In this embodiment, the air extraction module 4 is in an always-on state.

[0049] With the above arrangement, when the bottom of the bellows suction cup 33 is in contact with the peeled adhesive label, the label blocks the end of the bellows suction cup 33. At this time, a negative pressure is generated in the inner cavity of the bellows suction cup 33, thereby contracting the space of the bellows suction cup 33, strengthening the adsorption of the label, and preventing the label from falling. When the label is pasted onto the package, the adhesion force between the label and the package is greater than the adsorption force of the bellows suction cup 33. At this time, the label can be detached from the bellows suction cup 33.

[0050] Currently, most packages in the logistics industry are mainly plastic-wrapped, and the goods inside the packages have various shapes. In order to enable the label to fit well on the package, in this embodiment, it is improved as Figure 9 shown, the bottom of the positioning plate 31 is connected with a hot pressing plate 36 through a ball pin assembly. Specifically, when the label is in contact with the package, the positioning plate 31 drives the hot pressing plate 36 to move downward and push the label. At this time, the hot pressing plate 36 makes an adaptable angle adjustment according to the shape of the goods in the package, so that the label can fit well on the outside of the package.

[0051] In order to install the bellows suction cup 33, in this embodiment, as Figure 5 and Figure 6 shown, the bellows suction cup 33 is sleeved outside the hot pressing plate 36. In the first state, the top of the bellows suction cup 33 is lower than the bottom of the hot pressing plate 36, so that the label can be adsorbed on the bellows suction cup 33 first, and then the label can be driven to move downward together.

[0052] In this embodiment, since the cylinder 32 is used to drive the positioning plate 31 to move downward, thereby driving the label to be pushed downward. At this time, the positioning plate 31 and the hot pressing plate 36 are in hard contact when contacting the package. When the telescopic rod of the cylinder 32 extends and contracts excessively, it is easy to cause damage to the outer surface of the package. For this reason, in this embodiment, as Figure 5 Figure 6 and Figure 11 shown, a through guide hole 303 is provided on the positioning plate 31. A top push rod 34 is slidably connected to the inner wall of the guide hole 302. A reset assembly for resetting the top push rod 34 is installed between the top push rod 34 and the positioning plate 31. The hot pressing plate 36 is installed at the bottom of the top push rod 34 through a ball pin assembly.

[0053] With the above settings, after the ironing plate 36 pushes the label downward, the telescopic rod of the air cylinder 32 continues to extend outward, and the ironing plate 36 abuts against the package, thereby pushing the push rod 34 upward and stretching the reset assembly. At this time, the torque between the ironing plate 36 and the package is mainly provided by the reset assembly. This kind of abutment is in a soft contact state, which can reduce the damage to the outer surface of the package.

[0054] In this embodiment, as Figure 5 and Figure 6 shown, the reset assembly includes a spring 37. A push plate 341 is fixedly arranged at the top of the push rod 34. The spring 37 is sleeved outside the push rod 34, and one end of the spring 37 is fixedly connected to the push plate 341, and the other end is fixedly connected to the positioning plate 31.

[0055] With the above settings, when pasting the label, the ironing plate 36 pushes the label. At this time, the push rod 34 extends upward and stretches the spring 37. When the air cylinder 32 drives the telescopic rod to retract, the spring 37 resets at this time and drives the ironing plate 36 to move downward relative to the positioning plate 31, realizing the reset of the ironing plate 36 and the push rod 34.

[0056] In order to install the ironing plate 36, in this embodiment, as Figure 8 and Figure 12 shown, the ball pin assembly includes a ball head 343 and a ball groove 361. Among them, the ball head 343 is fixedly installed at the bottom of the push rod 34, the ball groove 361 is opened at the top of the ironing plate 36, and the ball head 343 is inserted into the ball groove 361 to form a ball pin pair, thereby facilitating the flipping of the ironing plate 36.

[0057] In order to ensure that when the telescopic rod of the air cylinder 32 retracts, the label is separated from the bellows suction cup 33. In this embodiment, the adsorption force of the bellows suction cup 33 on the label is less than the downward thrust exerted by the spring 37 on the ironing plate 36 in the reset state of the push rod 34, so as to ensure the separation of the label from the bellows suction cup 33.

[0058] The existing labels are pasted on the package mainly by the pressure of the rolling cylinder 1003 on the labels, so as to improve the adhesion strength. Here, in this embodiment, the adhesion strength of the labels is strengthened, and the adopted solution is as follows. A hot air supply module 5 is fixedly installed on the mounting plate 10. A distribution cavity 362 is arranged inside the ironing plate 36. A plurality of air holes are arranged between the inner wall of the distribution cavity 362 and the outer wall of the ironing plate 36. The air supply end of the hot air supply module 5 is communicated with the distribution cavity 362 through a pipeline.

[0059] Through the above arrangement, the gas in the hot air supply module 5 is transported to the distribution cavity 362 in the ironing plate 36 and discharged outward through the air holes. At this time, the hot air heats the label to increase the viscosity of the glue on the label, thereby enhancing the adhesion strength of the label on the package.

[0060] In this embodiment, in order to control the hot air inside the distribution chamber 362, in this embodiment, Figure 7 , Figure 8 and Figure 9 As shown, the positioning plate 31 is provided with a gas delivery channel 301 connected to the guide hole 303, one end of the gas delivery channel 301 is connected to the gas delivery end of the hot air supply module 5, and the push rod 34 is provided with an air channel 342, both ends of the air channel 342 are connected to the outer wall of the push rod 34, wherein, as Figure 5 As shown, the air channel 342 includes an air inlet 3421 and an air outlet 3422, and the air outlet 3422 is connected to the distribution chamber 362 through a pipeline. In the first state, as shown in FIG. Figure 6 and Figure 7 As shown, the air inlet 3421 and the air delivery channel 301 are displaced from each other. At this time, the other end of the air delivery channel 301 is blocked by the outer wall of the push rod 34. At this time, the hot air stops being transported to the inside of the distribution chamber 362. In the second state, as shown in FIG. Figure 8 and Figure 9 As shown, the air inlet 3421 is opposite to the air delivery channel 301 , thereby directing the hot air into the distribution chamber 362 , thereby supplying hot air to the ironing plate 36 .

[0061] In order to ensure that the air inlet 3421 can be opposite to the air delivery channel 301 when the push rod 34 pushes upward relative to the positioning plate 31, in this embodiment, Figure 5 and Figure 11 As shown, the inner wall of the guide hole 303 is provided with a guide groove 3031 arranged along the height direction, and the outer wall of the push rod 34 is fixedly provided with a guide sliding rib 345 inserted into the guide groove 3031. The guide sliding rib 345 can limit the circumferential rotation of the push rod 34 during the lifting and lowering process, thereby ensuring that the air inlet 3421 can be accurately connected with the gas transmission channel 301.

[0062] When the label is adsorbed on the accordion suction cup 33, in order to prevent the label from being separated from the ironing plate 36 due to excessive air pressure inside the distribution cavity 362, in this embodiment, the air holes include a first air hole 363 and a second air hole 364. Figure 12As shown, the second air hole 364 connects the external space at the side wall of the ironing plate 36 with the distribution cavity 362. The first air hole 363 is located at the bottom of the ironing plate 36 and is used for heating the label. When adsorbing the label, the second air hole 364 remains open and sprays hot air outwards to prevent the air pressure inside the distribution cavity 362 from rising.

[0063] In order to control the heating time of the hot air on the label, in this embodiment, as Figure 12 shown, a touch sensor 35 is fixedly arranged at the bottom of the positioning plate 34. The touch sensor 35 is electrically connected to the central control unit. A limiting plate 344 is fixedly arranged on the outer wall of the top push rod 34. In the first state, as Figure 6 and Figure 7 shown, the limiting plate 344 is disengaged from the touch sensor 35. In the second state, the limiting plate 344 abuts against the touch sensor 35. At this time, the touch sensor 35 provides an electrical signal to the central control unit. This signal indicates that the hot air passage is opened. After a period of time when the central control unit receives the signal from the touch sensor 35, it controls the telescopic rod of the cylinder 32 to retract upwards, thereby driving the positioning plate 31 and the ironing plate 36 to reset, completing the entire process of label pasting.

[0064] The entire process of label pasting is as follows:

[0065] The laser sensor 6 detects the package and generates an electrical signal to be transmitted to the central control unit. At this time, the central control unit controls the telescopic rod of the cylinder 32 to extend downwards. At this time Figure 6 the state changes from Figure 7 state. During this process, the bellows suction cup 33 gradually approaches the label. After adsorbing the label, the internal space pressure of the bellows suction cup 33 is relatively small, which causes the bellows suction cup 33 to contract, and the label fits against the bottom of the ironing plate 36. At this time, the telescopic rod of the cylinder 32 continues to move downwards. When the ironing plate 36 abuts against the package and continues to press, it then turns to Figure 8 the state shown. At this time, the top push rod 34 moves upwards to drive the spring 37 to elongate. At this time, the air inlet 3421 is connected to the air delivery channel 301, and hot air is supplied into the distribution cavity 362 to heat the label. In this state, the limiting plate 344 abuts against the touch sensor 35, and the touch sensor 35 transmits an electrical signal to the central control unit, thereby informing that the hot air channel is opened. After the central control unit delays for a period of time to continuously heat the label, it sends a signal to the cylinder 32 to retract the telescopic rod, thereby driving the positioning plate 31 and the ironing plate 36 to reset, preparing for pasting the next label.

[0066] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

Claims

1. A labeling machine for logistics, comprising a package conveying part (1001) and a label pasting part (1002) for pasting labels, Characterized in that: A label pressing part (3) for pressing the label on the package is provided at the rear side of the label pasting part (1002). The label pressing part (3) includes a positioning plate (31) that can move up and down. A push rod (34) that can slide up and down is provided on the positioning plate (31). The bottom of the push rod (34) is connected to a hot pressing plate (36) through a ball pin assembly. The labeling machine includes a hot air supply module (5) that provides hot air to the hot pressing plate (36). An air delivery channel (301) is provided on the positioning plate (31). One end of the air delivery channel (301) is connected to the air delivery end of the hot air supply module (5). An air duct (342) is provided on the push rod (34). A distribution cavity (362) and air holes are provided in the hot pressing plate (36). One end of the air duct (342) is connected to the distribution cavity (362). A reset assembly for restoring the push rod (34) from the second state to the first state is provided on the positioning plate (31). In the first state, the other end of the air duct (342) is misaligned with the air delivery channel (301). In the second state, the other end of the air duct (342) is in communication with the air delivery channel (301).

2. A labeling machine for logistics according to claim 1, Characterized in that: An accordion suction cup (33) for adsorbing labels is installed at the bottom of the positioning plate (31). An air extraction module (4) is provided on the labeling machine. The air extraction end of the air extraction module (4) is communicated with the inner cavity of the accordion suction cup (33).

3. A labeling machine for logistics according to claim 2, Characterized in that: The accordion suction cup (33) is sleeved outside the hot pressing plate (36). In the first state, the bottom of the accordion suction cup (33) is lower than the bottom of the hot pressing plate (36).

4. A labeling machine for logistics according to claim 2, Characterized in that: A through guiding hole (303) is provided on the positioning plate (31). The outer wall of the push rod (34) is slidably connected to the guiding hole (303).

5. A labeling machine for logistics according to claim 4, Characterized in that: A push plate (341) is fixedly provided at the top of the push rod (34). The reset assembly includes a spring (37). The spring (37) is sleeved outside the push rod (34) and one end thereof is fixed to the push plate (341), and the other end thereof is fixedly connected to the upper wall of the positioning plate (31).

6. A labeling machine for logistics according to claim 5, Characterized in that: The suction force of the air extraction module (4) is less than the elastic force of the spring (37) in the second state.

7. A labeling machine for logistics according to claim 4, Characterized in that: The ball pin assembly includes a ball head (343) and a ball socket (361). The ball head (343) is fixedly installed at the bottom of the top push rod (34), and the ball socket (361) is provided at the top of the ironing plate (36). The ball head (343) is inserted into the ball socket (361) to form a ball pin pair.

8. A labeling machine for logistics according to claim 1, wherein: The air holes include a first air hole (363) and a second air hole (364). The first air hole (363) communicates the distribution cavity (362) with the bottom wall of the ironing plate (36), and the second air hole (364) communicates the distribution cavity (362) with the side wall of the ironing plate (36).

9. A labeling machine for logistics according to claim 1, wherein: The air passage (342) includes an air inlet (3421) and an air outlet (3422). The air outlet (3422) is connected to the distribution cavity (362) through a connecting pipe. In the first state, the air inlet (3421) and the air delivery channel (301) are misaligned with each other. In the second state, the air inlet (3421) is in communication with the air delivery channel (301).

10. A labeling machine for logistics according to claim 4, wherein: A guiding groove (3031) is provided on the side wall of the guiding hole (303) along the thickness direction of the positioning plate (31), and a guiding rib (345) inserted into the guiding groove (3031) is provided on the outer wall of the top push rod (34).

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