CN113071775A

CN113071775A - Labeling equipment and labeling method

Info

Publication number: CN113071775A
Application number: CN202110552271.8A
Authority: CN
Inventors: 陈斌; 卢辉
Original assignee: Changzhou Kellum Intelligent Equipment Co ltd
Current assignee: Changzhou Kellum Intelligent Equipment Co ltd
Priority date: 2021-05-20
Filing date: 2021-05-20
Publication date: 2021-07-06

Abstract

The application discloses subsides mark equipment and subsides mark method, this subsides mark equipment includes: a conveying line for conveying a product, which is at least capable of conveying the product to a labeling position, the product having an attaching area for attaching a label; the distance detection device is used for detecting the distance between the product and the pasting area of the product to obtain a measured distance; the labeling device is used for adsorbing the label and driving the label to move from the initial position to the attaching area; and the control system is electrically connected with the distance detection device and the labeling device and is used for obtaining the moving distance of the label moving towards the labeling area according to the measured distance. This application can be pasted mark to the product of unidimensional not reliably, and degree of automation is high.

Description

Labeling equipment and labeling method

Technical Field

The application relates to the technical field of labeling, in particular to labeling equipment and a labeling method.

Background

Among the prior art, often need paste on the product surface and cover the label, the relevant information of product is recorded on the label, take the melon and fruit as an example, melon and fruit such as watermelon, Hami melon need classify according to its size, weight etc. usually, in order to facilitate discernment the information of melon and fruit, can be after measuring its size, weighing its weight, print the label through printing device, then paste the label by the manual work to the melon and fruit. Through observing the relevant information recorded on the label, people can be more convenient classify the melon and fruit.

Because manual labeling needs to occupy more human resources, the direction of research is to automatically complete labeling operation by using automatic equipment. However, due to the different sizes of the melons and fruits, it is difficult for the automation equipment to reliably attach the label to the surface of the melons and fruits, for example, for the melons and fruits with small sizes, the labels cannot be attached in place easily, and for the melons and fruits with large sizes, the melons and fruits are damaged easily due to the excessive attaching force.

Disclosure of Invention

In view of the above-mentioned shortcomings in the art, the present application provides a labeling apparatus and labeling method that can reliably label products of different sizes.

In order to solve the technical problem, on the one hand, this application provides a subsides mark equipment, includes:

a conveying line for conveying a product, which is at least capable of conveying the product to a labeling position, the product having an attaching area for attaching a label;

the distance detection device is used for detecting the distance between the product and the pasting area of the product to obtain a measured distance;

the labeling device is used for adsorbing the label and driving the label to move from the initial position to the attaching area; and

and the control system is in communication connection with the distance detection device and the labeling device and is used for obtaining the moving distance of the label moving towards the labeling area according to the measured distance.

Further, the labeling device comprises a linear driving device and a suction head for adsorbing the label, and the linear driving device is used for driving the suction head to move towards the labeling area.

Further, the measuring direction of the distance detecting device is parallel to the moving direction of the label, and the measuring direction is perpendicular to the conveying direction of the conveying line.

Further, the control system firstly obtains a theoretical distance between the label at the initial position and a pasting area of the product at the labeling position according to the measured distance and the relative position of the label and the distance detection device at the initial position, and then obtains the moving distance after adding a preset distance allowance.

Further, the product is the melon and fruit, and it has the vertical plane of symmetry through its center, the plane of symmetry with paste and cover the region and intersect, the distance detection device measure get with paste the regional shortest distance of covering do it measures the distance.

Further, the pasting area is symmetrical to the symmetry plane, and the central moving track of the label is located on the symmetry plane.

On the other hand, the application provides a labeling method, which comprises the following steps:

s1, moving a product to a labeling position, wherein the product is provided with a labeling area for labeling a label;

s2, measuring the distance between the product and a pasting area of the product through a distance detection device to obtain a measured distance;

s3, obtaining a moving distance required for label pasting at an initial position according to the measured distance;

and S4, driving the label to move the moving distance from the initial position to the pasting area.

Further, in step S3, a theoretical distance between the label at the initial position and the application region of the product at the labeling position is calculated according to the measured distance and the relative position between the label at the initial position and the distance detection device, and then a preset distance margin is added to obtain the moving distance.

Further, the product is melon and fruit, and it has the vertical plane of symmetry through its center, the plane of symmetry is crossing with the region of covering of subsides, the distance detection device measure get with the shortest distance of product is the distance of surveying.

Compared with the prior art, the application has the beneficial effects that: this application is when pasting the standard the moving distance of label according to the measuring distance of pasting between the region with the product that distance detection device is measured and adjust, even the big small-size of product changes, also can make the reliable subsides of label cover on the product, can not lead to the label can't paste and cover on the product because the product size diminishes, also can not lead to and the product between the extrusion force too big because the product size is too big, damage the product, it pastes and covers the quality better, and can realize pasting the mark operation to the automation of product, degree of automation is high, the manpower has been saved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:

fig. 1 is a schematic structural view of a labeling apparatus in the present application.

Fig. 2 is a schematic view of the pallet in this application in position on the conveyor line.

Fig. 3 is a schematic view of the melon and fruit coating area in the present application.

Fig. 4 is a front view of the labelling mechanism in the present application.

Fig. 5 is a schematic view of another direction of view of the labeling mechanism of the present application.

Fig. 6 is a schematic structural view of the labeling device in the present application.

Fig. 7 is an enlarged view of a portion I in fig. 4.

Fig. 8 is a schematic view of the positions of the labeling device, the printing device and the air nozzle in the present application.

Fig. 9 is a side view of the labeling apparatus of the present application.

Fig. 10 is a schematic position diagram of the distance detection device in the present application.

Fig. 11 is a schematic view of the distance detection device of the present application when the measurement direction is tilted with respect to the moving direction of the tag.

Fig. 12 is a schematic view of the distance detection device according to the present application when the measurement direction is parallel to the moving direction of the tag.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "comprising" and "having," as well as any variations thereof, in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

As shown in fig. 1, a labeling apparatus corresponding to a preferred embodiment of the present application includes a conveying line 1, a labeling mechanism 2, and a distance detecting device 3. The conveyor line 1 is used for conveying products 4; the labeling mechanism 2 is used for labeling the products 4 on the conveying line 1; the distance detection device 3 is used for detecting the distance between the labeling mechanism 3 and the product 4 to obtain a measured distance, and the distance for driving the label 5 to move by the labeling mechanism 3 during labeling is adjusted according to the measured distance.

The type of the product 4 is not limited, and is preferably melon and fruit, such as watermelon, hami melon, white gourd, and the like, and more preferably, the product 4 is watermelon.

The transfer chain 1 can be the line bodies such as belt conveyor line or roller transfer chain, and in this embodiment, transfer chain 1 is the roller transfer chain, and it supports and carries the melon and fruit through the roller 10 by motor drive is rotatory. The conveyor line 1 drives the products 4 to move along a straight line (conveying direction a) and can move at least the products 4 to the labeling position, so that the labeling mechanism 3 can label the products 4 at the labeling position. Specifically, as shown in fig. 3, the product 4 has an application region 41 for applying the label 5, and the labeling mechanism 2 can apply the label 5 to the application region 41 of the product 4 at the labeling position.

In order to stop the products 4 at the labeling position, in the present embodiment, a position sensor 11 is provided on the conveyor line 1, and the position sensor 11 is correspondingly provided near the labeling position, and when it detects the products 4, it indicates that the products 4 are moved to the labeling position, and at this time, the conveyor line 1 stops conveying. The position sensor 11 may be, for example, an opposite type photoelectric sensor, which is a sensor in the prior art, as shown in fig. 2, and includes a transmitter 110 and a receiver 111 respectively disposed at two sides of the conveying path of the conveying line 1, the transmitter 110 emits a light beam toward the receiver 111, the receiver 111 is used for receiving the light beam, when the melon and fruit moves to between the transmitter 110 and the receiver 111, the light beam is blocked, which indicates that the product 4 moves in place, at this time, the conveying line 1 stops conveying, and the control system of the labeling device controls the labeling mechanism 2 to perform labeling. Obviously, in other embodiments, a mechanism such as a baffle driven by a cylinder may be provided to limit the product 4 at the labeling position.

Continuing to refer to fig. 2, still be provided with tray 12 on the transfer chain 1, be provided with foam-rubber cushion 120 in the tray 12, spacing hole 121 has been seted up at foam-rubber cushion 120 center, and product 4 places on foam-rubber cushion 120, and is spacing by spacing hole 121, prevents that product 4 from rolling. For melon and fruit products, as shown in fig. 3, the melon and fruit products are generally symmetrical and have a vertical symmetrical plane 40 passing through the center thereof, and when the melon and fruit products are placed on the tray 12, the symmetrical plane 40 passes through the center of the limiting hole 121, so that the center of gravity of the melon and fruit is located above the center of the limiting hole 121, and the melon and fruit products are placed more stably and are not prone to tilting.

It will be appreciated that the light beam of the correlation type photo sensor can be blocked by the product 4, by the tray 12, and preferably by the tray 12, since the size of the product 4 is different and the size of the tray 12 is the same, and the center of the product 4 is substantially on the same vertical axis as the center of the tray 12, so that the center of the product 4 can be positioned by the tray 12 more conveniently and accurately positioned to the labeling position.

The labeling mechanism 2 comprises a mounting frame 20, and a printing device and a labeling device 21 which are both connected to the mounting frame 20, wherein the printing device is used for printing the label 5, and conveying the printed label 5 out of the printing device, so that the label 5 is positioned at an outlet of the printing device, and the labeling device 21 is convenient to suck the label 5. It can be understood that, before the product 4 is labeled by the labeling device, the product information is transmitted to the control system through the steps of size measurement, weight measurement, and the like, so that the label 5 with the corresponding information can be printed by the printing device and is attached by the labeling device 21.

As shown in fig. 4, in the present embodiment, the printing apparatus includes a label feeding device 22 and a printing device 23, the label feeding device 22 is configured to feed blank labels into the printing device 23, the printing device 23 prints the labels 5, and the printing device 23 may directly adopt a printing module in the prior art. Of course, in other embodiments, the printing device may also directly employ prior art label printers.

As shown in fig. 4 and 5, the label feeding device 22 includes a feeding tray 220 and a receiving tray 221 rotatably connected to the mounting frame 20, and the feeding tray 220 and the receiving tray 221 are respectively driven to rotate by a first motor 222 and a second motor 223. Be used for placing the label book 50 of lapping on the blowing dish 220, label book 50 includes the base film layer and pastes the label 5 that covers a plurality of equidistant settings on the base film layer, and the base film layer is used for pasting the surface coating that covers label 5 and has from the type material to in follow and tear off label 5 above that.

The label feeding device 22 further comprises a plurality of tension rollers connected to the mounting frame 20, in this embodiment, four tension rollers, as shown in fig. 4, including a first tension roller 224 and a second tension roller 225 between the discharging tray 220 and the receiving tray 221, and a third tension roller 226 and a fourth tension roller 227 under the center of the receiving tray 221. The label roll on the discharging tray 220 enters the feeding port 230 of the printing device 23 after passing through the first tension roller 224 and the second tension roller 225, the labels 5 are separated from the base film layer at the feeding port 230 and are fed into the printing device 23 for printing, and the base film layer without the labels 5 passes through the third tension roller 226 and the fourth tension roller 227 and is wound on the receiving tray 221. The first motor 222 drives the discharging tray 220 to discharge, and the second motor 223 drives the receiving tray 221 to receive, so that the labels 5 can be fed into the printing device 23 one by one and printed by the printing device 23.

As shown in fig. 6, the labeling device 21 includes a linear driving device 210 connected to the mounting frame 20 and an adsorption component 211 driven by the linear driving device 210 to move linearly, the linear driving device 210 may be a device having a linear driving function, such as an electric cylinder or a servo slide table, and the linear driving device 210 can control the moving distance of the adsorption component 211.

In this embodiment, the linear driving device 210 is a servo sliding table, and includes a servo motor 2100, a first sliding table 2101, and a transmission mechanism connected between the servo motor 2100 and the first sliding table 2101, where the transmission mechanism may be, for example, a lead screw nut transmission or a synchronous belt transmission. An attachment plate 212 is connected to the first slide table 2101, and the suction unit 211 is connected to the attachment plate 212 and movable in accordance with the movement of the attachment plate 212.

The suction assembly 211 for sucking the label 5 transported from the printing apparatus 23 to the outlet position of the printing apparatus 23 includes a connector 2110 connected to the mounting plate 212 and a suction head 2111 provided at an end of the connector 2110. The connector 2110 has a tubular shape, and an air tube is provided therein, and is connected to a negative pressure generating device such as a suction head 2111 and a vacuum pump, and can generate a negative pressure in the suction head 2111 to suck the label 5 fed from the printing apparatus. Referring to fig. 4 and 7, when the suction head 2111 is in the retracted state (home position), which is disposed in correspondence with the label 5 at the exit position, it is preferable that the plane of the front end of the suction head 2111 be parallel to the plane of the label 5 when it is removed from the exit of the printing apparatus 23, and the label 5 sent out by the printing apparatus 23 be located just in front of the suction head 2111 and in close proximity to the suction head 2111, for example, at a spacing of 0 to 2mm, so as to be able to be sucked by the suction head 2111.

In order to further facilitate the adsorption of the label 5 by the suction head 2111, as shown in fig. 8, an air nozzle 24 is provided below the outlet position, the air nozzle 24 blows air from bottom to top to blow the label 5 toward the suction head 2111, so that the label 5 can be tightly attached to the suction head 2111, the suction head 2111 is not difficult to adsorb due to the sagging of the label 5, and the adsorption is more reliable. The air nozzle 24 is preferably arranged at an angle which does not lie in the path of movement of the cleaner head 2111 so as not to interfere with the movement of the cleaner head 2111. The mounting position of the air nozzle 24 is not limited, and for example, the air nozzle may be connected to the outer surface of the printing device 23 through the bracket 240, or may be connected to the mounting bracket 20 or the conveying line 1. In a preferred embodiment, the air nozzle 24 is located below the printing device 23 and on the side of the outlet position close to the printing device 23, is arranged obliquely upward, and blows air toward the suction head 2111, so that the label 5 can be more reliably blown onto the suction head 2111, and even if the label 5 has sagged, the label can be blown up to be attached to the suction head 2111.

In a preferred embodiment, connector 2110 is a carbon fiber tube, which is lightweight and strong.

When the product 4 is located at the labeling position, it is located on the moving path of the suction head 2111, and after the suction head 2111 sucks the label 5, the linear driving device 210 drives the label 5 to move toward the product 4, thereby attaching the label 5 to the product 4. It is clear that the label 5, when it is on the suction head 2111, has its glue layer facing away from the suction head 2111 and towards the product 4, and can thus be stuck to the surface of the product 4.

A photoelectric sensor can be arranged to detect the distance between the label 5 and the suction head 2111 to judge whether the label 5 is reliably adsorbed on the suction head 2111, or an air pressure sensor can be arranged to measure the air pressure in the suction head 2111 or an air pipe, when the air pressure changes greatly, the suction head 2111 is shown to adsorb the label 5, at the moment, the sensor sends a signal to a control system, and the control system sends a labeling instruction to the linear driving device 210, namely, the linear driving device 210 is controlled to drive the suction head 2111 to move.

As a preferred embodiment, as shown in fig. 9, the suction head 2111 is located above the product 4, and the label 5 is applied to the surface of the product 4 from top to bottom, preferably, the included angle a between the moving direction of the suction head 2111 and the horizontal plane is 60 ° to 90 °, so that on one hand, the horizontal component force generated by the suction head 2111 on the product 4 can be prevented from pushing the product 4 away from the tray 12 horizontally, and on the other hand, the horizontal component force can be prevented from driving the product 4 and the tray 12 to move together on the conveyor line 1, the application is more reliable, and the application quality is better. The mounting frame 20 can be arranged with the mounting plate 200 for mounting the printing device and the labelling device 21 inclined, so that the labelling device 21 is also inclined, so that the suction head 2111 can apply the label 5 obliquely to the product 4 from above the side of the product 4.

As shown in fig. 10, in the present embodiment, the distance detecting device 3 is a distance sensor, which is disposed on the mounting frame 20 and is used for measuring a distance between the distance detecting device and the product 4, and more specifically, for measuring a distance between the distance detecting device and the attaching area 41 of the product 4, and when the product 4 moves through the measuring area of the distance detecting device 3, the distance detecting device 3 can detect the distance between the product 4 and the product 4 in real time. The distance detection device 3 preferably performs distance measurement by a method of no physical contact with the product 4, such as ultrasonic distance measurement, laser distance measurement, or infrared distance measurement.

Since the surface of the melon and fruit is usually arc-shaped, the distance between the melon and fruit measured by the distance detection device 3 changes during the movement, and in order to facilitate distance measurement, it is preferable to make the symmetry plane 40 intersect with the attachment area 41, so that the portion of the arc-shaped surface of the melon and fruit closer to the symmetry plane 40 is closer to the distance detection device 3, the measured shortest distance can be taken as the distance between the attachment area 41 and the portion, and when the label is attached to the label position, the attachment area 41 is located on the moving path of the label 5, so that the label 5 is attached to the attachment area 41 after the suction head 2111 extends out. It is further preferred that the application area 41 is symmetrical with respect to the symmetry plane 40 of the product 4, and in this embodiment, when the tag 5 moves along with the suction head 2111, the central moving path formed by the geometric center of the tag is located on the symmetry plane 40 of the product 4, so that the tag 5 can be applied to the middle of the product 4, which is more attractive, and the product 4 is more stably stressed during application, and is not easily displaced in one direction.

As a preferred embodiment, the measuring direction of the distance detection means 3 is perpendicular to the moving direction of the product 4, so that the distance between it and the application area 41 can be conveniently measured.

After the distance detection means 3 have obtained the measured distance between them and the application area 41, it is possible to convert the measured distance into a theoretical distance between the label 5 at the initial position and the application area 41 of the product 4 at the labelling position, since the relative position between the distance detection means 3 and the label 5 at the initial position is known. For example, referring to fig. 11, in fig. 11, the measuring direction of the distance detecting device 3 is inclined relative to the moving direction of the tag 5, the measured distance of the distance detecting device 3 is L, and meanwhile, the distance difference D between the distance detecting device 3 and the tag 5 in the moving direction and the included angle B between the measuring direction and the moving direction are known, so the theoretical distance S is H minus D. After the theoretical distance is obtained, the theoretical distance can be further used as the moving distance of the suction head 2111, and certainly, in order to enable the label 5 to be more reliably attached to the product 4, the moving distance can be slightly larger than the theoretical distance, for example, a distance margin of 0-3 mm is added to ensure the pressure during attachment, and the distance margin can be preset and adjusted according to different types of products 4. In this context, the initial position of the tag 5, which refers to its original position when it has not been moved by the suction head 2111, may be the position at the exit position, or the position after suction by the suction head 2111 at the home position, since the position at the exit position and the position after suction are known, the positional deviation in both cases can be eliminated by adjusting the distance margin.

It is further preferable that the measuring direction of the distance detecting means 3 and the moving direction of the tip 2111 are parallel to each other, so that the calculation is more convenient when the measured distance is converted into the moving distance of the tip 2111. For example, as shown in fig. 12, if the distance difference between the distance detection device 3 and the initial position in the moving direction of the tag 5 is D, the theoretical distance S is the measured distance L minus the distance difference D.

When the product 4 is conveyed, the product 4 moves to the distance detection device 3, the distance detection device 3 measures the distance between the product 4 and the pasting area 41 to obtain the measured distance, the control system calculates the moving distance of the suction head 2111 according to the measured distance, and after the product 4 moves to the labeling position 21, the labeling device 21 drives the label 5 to move by the length of the moving distance so as to paste the label 5 on the pasting area 41.

Because the moving distance of the label 5 is adjusted according to the measuring distance, even if the size of the product 4 is changed, the label 5 can be properly attached to the product 4, the problem that the label cannot be attached to the product 4 due to the fact that the extension distance of the suction head 2111 is too short or the product 4 is damaged due to the fact that the extension distance is too long is solved, the attachment is more reliable, and the quality is better.

The control system in this application and the electrical apparatus part communication connection of subsides mark equipment for receive each electrical apparatus part's signal and control the action of each part, it can also carry out certain calculation function simultaneously. The control system can adopt a PLC or an industrial personal computer and the like, and can realize the functions of signal transmission, control, calculation and the like by relevant means in the prior art, and the description is omitted.

The application also provides a labeling method, which comprises the following steps:

s1, moving a product 4 to a labeling position, wherein the product 4 is provided with a labeling area 41 for labeling a label 5;

s2, measuring the distance between the distance detection device 3 and the pasting area 41 to obtain a measured distance;

s3, obtaining a moving distance required by labeling of the label 5 at the initial position according to the measured distance;

and S4, driving the label 5 to move from the initial position to the pasting area 41 by the length of the moving distance.

In step S1, the product 4 is conveyed by the conveyor line 1, and the conveyor line 1 conveys the product 4 along a straight line, which has a conveying direction a. In a preferred embodiment, the distance detection means 3 are located before the labelling position, to which the product 4 reaches after passing the distance detection means 3, so that the control system can calculate the distance during the movement of the product 4 more efficiently. In another preferred embodiment, the distance detection means 3 are provided at the suction head 2111 to allow distance measurement when the product 4 is moved to the labelling position, preferably in the same position as the label 5 in the initial position, in which case the measured distance can be taken directly as the theoretical distance.

As a preferred embodiment, the product 4 is a melon fruit and has a vertical through-center plane of symmetry 40, the plane of symmetry 40 intersecting the application area 41, and preferably the application area 41 is symmetrical about this plane of symmetry 40. In step S2, the distance detection device 3 determines the shortest distance to the product 4 as the measured distance.

In step S3, a theoretical distance between the label 5 and the application region 41 of the product 4 at the labeling position at the initial position is calculated according to the measured distance and the relative position between the label 5 and the distance detection device 3 at the initial position, and then a distance margin is added to obtain the moving distance.

As a preferred embodiment, the measuring direction of the distance detecting device 3 is parallel to the moving direction of the label 5, so that the theoretical distance can be calculated more conveniently and the calculation amount can be reduced.

As a preferred embodiment, the measuring direction of the distance detection device 3 is perpendicular to the conveying direction a, so that the measuring result of the distance detection device 3 on the products 4 is more accurate.

As a preferred embodiment, the moving direction of the label 5 is the conveying direction a, so that the label 5 can be applied perpendicularly to the application area 41, and the application quality of the label 5 is better.

As a preferred embodiment, the labeling method of the present application is performed by the labeling apparatus described above.

This application is when pasting the standard the moving distance of label according to the measuring distance of pasting between the region with the product that distance detection device is measured and adjust, even the big small-size of product changes, also can make the reliable subsides of label cover on the product, can not lead to the label can't paste and cover on the product because the product size diminishes, also can not lead to and the product between the extrusion force too big because the product size is too big, damage the product, it pastes and covers the quality better, and can realize pasting the mark operation to the automation of product, degree of automation is high, the manpower has been saved.

The above description is only for the purpose of illustrating embodiments of the present invention and is not intended to limit the scope of the present invention, and all modifications, equivalents, and equivalent structures or equivalent processes that can be used directly or indirectly in other related fields of technology shall be encompassed by the present invention.

Claims

1. A labeling apparatus, comprising:

-a conveyor line (1) for conveying products (4) capable of conveying at least said products (4) to a labeling position, said products (4) having an application area (41) for applying labels (5);

a distance detection device (3) for detecting the distance between the product (4) and the application area (41) to obtain a measured distance;

a labelling device (21) for attracting the label (5) and driving the label (5) to move from an initial position towards the application area (41); and

and the control system is in communication connection with the distance detection device (3) and the labeling device (21) and is used for obtaining the moving distance of the label (5) moving towards the attaching area (41) according to the measured distance.

2. Labelling apparatus according to claim 1, characterised in that said labelling device (21) comprises a suction head (2111) for attracting said labels (5) and a linear drive device (210), said linear drive device (210) being adapted to drive said suction head (2111) towards said application area (41).

3. Labelling apparatus according to claim 1, characterised in that the measuring direction of the distance detection device (3) is parallel to the direction of movement of the labels (5) and perpendicular to the conveying direction of the conveyor line (1).

4. Labelling apparatus according to claim 1, characterised in that the control system first derives the theoretical distance between the label (5) in the initial position and the application zone (41) of the product (4) in the labelling position, from the measured distance and the relative position of the label (5) and the distance detection means (3) in the initial position, plus a preset distance margin to derive the travelling distance.

5. Labeling apparatus according to any one of claims 1 to 4, characterized in that said product (4) is a melon or fruit having a plane of symmetry (40) passing vertically through its center, said plane of symmetry (40) intersecting said application area (41), the shortest distance measured by said distance detection means (3) from said application area (41) being said measured distance.

6. Labeling apparatus according to claim 5, characterized in that said application area (41) is symmetrical with respect to said plane of symmetry (40), the central trajectory of movement of said label (5) being located on said plane of symmetry (40).

7. A labeling method is characterized by comprising the following steps:

s1, moving a product (4) to a labeling position, wherein the product (4) is provided with a labeling area (41) for labeling a label (5);

s2, measuring the distance between the product and a pasting area (41) of the product (4) through a distance detection device (3) to obtain a measured distance;

s3, obtaining a moving distance required by labeling of the label (5) at the initial position according to the measured distance;

s4, driving the label (5) to move towards the pasting area (41) from the initial position by the moving distance.

8. The labeling method according to claim 7, characterized in that in step S3, a theoretical distance between the label (5) at the initial position and the application region (41) of the product (4) at the labeling position is calculated according to the measured distance and the relative position of the label (5) and the distance detection device (3) at the initial position, and then a preset distance margin is added to obtain the moving distance.

9. Labelling method according to claim 7, characterised in that said product (4) is a melon or fruit having a symmetry plane (40) passing vertically through its centre, said symmetry plane (40) intersecting an application area (41), the shortest distance measured by said distance detection means (3) from said product (4) being said measured distance.

10. Labelling method according to claim 7, characterised in that the measuring direction of the distance detection device (3) is parallel to the moving direction of the labels (5) and perpendicular to the conveying direction of the conveyor line (1).