Cartoning machine

Abstract

The present invention discloses a carton sealer, which includes a conveying device, a bending device erected above the conveying device, and a labeling device located beside the conveying device. The conveying device is used to convey a packing box with an upward opening to the bending device. The bending device is located around the opening of the packing box and can perform rotational movement and linear movement of approaching or moving away from the packing box. The bending device performing rotational movement can drive the two opposite short sides at the opening of the packing box to bend towards the direction close to the opening to form an inner cover for closing the opening. The bending device performing linear movement can drive the two opposite long sides at the opening of the packing box to bend towards the direction close to the opening to form a top cover for closing the opening at the upper end of the inner cover. The labeling device can perform linear reciprocating movement relative to the packing box and is used to correspondingly attach two kinds of labels to the packing box. The conveying device is also used to convey the labeled packing box for discharging. The whole machine has a simple structure and a reasonable layout, high packaging positioning accuracy and high efficiency.

Description

Technical Field

[0001] The present invention relates to packaging equipment for electronic products, and particularly to a carton sealer for sealing and labeling cartons. Background Art

[0002] In the process from the manufacture of goods to the final consumers, packaging is indispensable. Especially for electronic products such as routers, mobile phones, and batteries, in order to avoid mechanical damage or accidents due to collisions during transportation, loading, unloading, and stacking, effective and safe packaging is particularly important for electronic products. Among them, when packaging electronic products into cartons, operations such as forming and transferring cartons, packing products, sealing and labeling the cartons after packing are often involved.

[0003] Currently, for the bending and forming, sealing, and subsequent labeling operations of cartons, many still adopt manual operations. Manual operations are time-consuming, inefficient, and costly, and there are also problems of low accuracy and safety hazards in manual packaging. Moreover, when the structures of more and more cartons become more and more complex and more than one type of label needs to be attached to them, the packaging difficulty is further increased.

[0004] Therefore, there is an urgent need for a carton sealer that can achieve automated operations, has a simple structure, high packaging positioning accuracy, and high efficiency to overcome the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a carton sealer that can achieve automated assembly line operations, has a simple structure, high packaging positioning accuracy, and high efficiency.

[0006] To achieve the above object, the present invention discloses a carton sealer, which includes a working platform, a conveying device arranged along the longitudinal direction of the working platform, a bending device erected above the conveying device, and a labeling device located beside the conveying device. The conveying device is used to convey a carton with an open top to the bending device. The bending device is located around the opening of the carton and can perform rotational movement and linear movement of approaching or moving away from the carton. The bending device in rotational movement can drive the two opposite short sides at the opening of the carton to bend towards the direction close to the opening to form an inner cover for closing the opening. The bending device in linear movement can drive the two opposite long sides at the opening of the carton to bend towards the direction close to the opening, and form a top cover for closing the opening at the upper end of the inner cover. The labeling device can perform linear reciprocating movement relative to the carton and is used to attach two types of labels to the carton correspondingly. The conveying device is also used to convey the labeled carton for discharging.

[0007] Compared with the prior art, the case sealer provided by the present invention rotates and moves relative to the packaging box through the bending device installed above the conveying device and around the periphery of the box opening of the packaging box, and correspondingly bends the two opposite short sides and the two opposite long sides at the box opening towards the direction close to the box opening to form an inner cover and a top cover for closing the box opening, thereby efficiently realizing the bending and forming of the packaging box with a double-layer cover; and after forming the packaging box, through the labeling device installed beside the conveying device moving linearly back and forth relative to the packaging box, two kinds of labels are automatically attached to the packaging box efficiently. The whole machine has a simple structure and a reasonable layout, effectively shortening the moving stroke between devices, thereby realizing the automated flow operation of bending and forming, sealing the packaging box and attaching multiple labels, effectively improving the production efficiency and correspondingly reducing the manufacturing cost.

[0008] Preferably, the conveying device includes two conveyor belts arranged side by side at a certain interval, and the two conveyor belts cooperate with each other to form a conveying path therebetween for conveying the packaging box.

[0009] Preferably, the conveying device further includes conveying rollers, and a plurality of the conveying rollers are arranged at equal intervals along the conveying direction of the conveyor belt on the conveying path.

[0010] Preferably, the bending device includes a first bending mechanism and a second bending mechanism respectively arranged outside the two short sides and a third bending mechanism arranged outside the two long sides. The first bending mechanism and the second bending mechanism can synchronously bend the short sides opposite to them, and the structures of the first bending mechanism and the second bending mechanism can be different. The third bending mechanism is used for synchronously bending the two long sides.

[0011] Preferably, the first bending mechanism includes a first mounting plate, a first linear driver, a first rack and a first gear that are engaged with each other, and a first pressing plate. The first linear driver is installed on the first mounting plate, the first rack is connected to the output end of the first linear driver, the first pressing plate is rotatably installed on the first mounting plate, and the rotation axis of the first pressing plate is connected to the first gear.

[0012] Preferably, the second bending mechanism includes a second mounting plate, a first rotary driver, a synchronous belt and a second pressing plate. The first rotary driver is installed on the upper side of the second mounting plate, the second pressing plate is rotatably installed on the lower side of the second mounting plate, and the synchronous belt is sleeved on the output shaft of the first rotary driver and the rotation axis of the second pressing plate.

[0013] Preferably, the third bending mechanism includes a third mounting plate, a second rotary driver, a second gear, a second rack, and a third pressing plate. The second rotary driver is disposed at the relative center of the third mounting plate. The second gear is connected to the output end of the second rotary driver. Each of the two opposite sides of the second gear meshes with a second rack, and the two second racks are symmetrically slidably disposed on the two opposite sides of the third mounting plate with the second gear as the center. The two third pressing plates are connected to the two second racks in a one-to-one correspondence.

[0014] Preferably, the labeling device includes a label receiving table, a labeling head, a marking machine, and a label supply tray. Two placement areas corresponding to the shapes of the two types of labels are respectively provided on the label receiving table and the labeling head. The label receiving table can move back and forth between the marking machine, the labeling head, and the label supply tray for alternately transferring the two types of labels received from the marking machine and the label supply tray to the lower side of the labeling head. The labeling head can move back and forth between the label receiving table and the conveying device for attaching the two types of labels to the corresponding positions of the packaging box.

[0015] Preferably, the carton sealer of the present invention further includes a sealing glue device, which is disposed on the lower side or / and the upper side of the conveying device for attaching a straight tape to the bottom cover or / and the top cover of the packaging box.

[0016] Preferably, the sealing glue device includes a material tray, a guiding wheel, and a cutting knife. The tape is loaded on the material tray and its free end is wound around the guiding wheel. The guiding wheel and the cutting knife are telescopically disposed relative to the conveying device. The guiding wheel can move or rotate relative to the packaging box to telescopically approach or move away from the packaging box, so that the straight tape is adhered to the packaging box and forms a sealing section on the packaging box as the packaging box moves. The cutting knife can move or rotate relative to the packaging box to telescopically approach or move away from the packaging box, thereby separating the sealing section from the straight tape. Description of the Drawings

[0017] Figure 1 is a perspective structural view of the carton sealer of the present invention at an angle.

[0018] Figure 2 is a perspective structural view of the carton sealer of the present invention at another angle.

[0019] Figure 3 is a plan structural view of the carton sealer of the present invention.

[0020] Figure 4 is a perspective structural view of the bending device of the present invention.

[0021] Figure 5It is a side view of the bending device of the present invention.

[0022] Figure 6 It is a schematic three-dimensional structure diagram of the first bending mechanism of the present invention.

[0023] Figure 7 It is a schematic three-dimensional structure diagram of the second bending mechanism of the present invention.

[0024] Figure 8 It is a schematic three-dimensional structure diagram of the third bending mechanism of the present invention.

[0025] Figure 9 It is a side view of the third bending mechanism of the present invention.

[0026] Figure 10 It is a schematic three-dimensional structure diagram of the labeling platform of the present invention.

[0027] Figure 11 It is a schematic three-dimensional structure diagram of the labeling head of the present invention.

[0028] Figure 12 It is a schematic three-dimensional structure diagram of the labeling head connected to the first linear module of the present invention. Detailed implementation manners

[0029] To describe in detail the content, structural features, achieved objectives and effects of the present invention, the following will be described in detail in conjunction with the implementation manners and with reference to the accompanying drawings.

[0030] Refer to Figures 1 to 4 , the present invention discloses a carton sealer 100, which is mainly used for bending and forming the double-layer sealing lids of a packing box 200 and applying glue, and is also used for attaching more than one type of label to the packing box 200. Specifically, the carton sealer 100 provided by the preferred embodiment of the present invention includes a working platform 10, a conveying device 20 arranged along the longitudinal direction of the working platform 10, a bending device 30 erected above the conveying device 20, and a labeling device 40 located beside the conveying device 20. The conveying device 20 is used to convey the packing box 200 with an upwardly open and unsealed mouth to the bending device 30. The bending device 30 is located around the mouth of the packing box 200 and can perform rotational movement and linear movement of approaching or separating from the packing box 200. The rotational movement of the bending device 30 can drive the two opposite short sides 201 at the mouth of the packing box 200 to bend towards the direction close to the mouth to form an inner lid for closing the mouth of the box. The linear movement of the bending device 30 can drive the two opposite long sides 202 at the mouth of the packing box 200 to bend towards the direction close to the mouth, and form a top lid for closing the mouth of the box at the upper end of the inner lid. The labeling device 40 can perform linear reciprocating movement relative to the packing box 200 and is used to attach the label 300 and the label 400 to the packing box 200 correspondingly. The conveying device 20 is also used to convey the labeled packing box 200 for discharging.

[0031] It should be noted that, in the present application, the bottom cover 203 of the packaging box 200 conveyed on the conveying device 20 has been bent and formed, and the packaging box 200 has been loaded with electronic products. The bending device 30 is mainly used to fold and form the packaging box 200 with indentations. Of course, the carton sealing machine 100 of the present invention also includes a control system, which is electrically connected to the conveying device 20, the bending device 30 and the labeling device 40, and is used to control the coordinated actions of the various devices. Among them, the control system is an existing design, and its structure and control principle are well known in the art, so it will not be described in detail here.

[0032] See also Figures 1 to 3 The conveying device 20 includes two conveyor belts 21 arranged side by side at a certain interval. The two conveyor belts 21 cooperate with each other to form a conveying path between the two conveyor belts for conveying the packaging box 200. The two conveyor belts 21 can be annular belts. The conveying surfaces of the two conveyor belts 21 can be arranged parallel to the bottom cover 203 of the packaging box 200. Then, the two conveyor belts 21 can be horizontally supported from below at the opposite edges of the bottom cover 203, thereby transferring the packaging box 200 along the longitudinal direction of the working platform 10.

[0033] Specifically, in a preferred embodiment of the present invention, the conveying surfaces of the two endless conveyor belts 21 can be arranged perpendicular to the bottom cover 203 of the packaging box 200, and the two conveyor belts 21 are arranged vertically in the longitudinal direction of the working platform 10, and the packaging box 200 can be pushed by the left and right opposite sides of the packaging box 200, which correspond to the two sides where the two long sides 202 are located, so as to cooperate to convey the packaging box 200 along the longitudinal direction of the working platform 10. At this time, in order to strengthen the pushing force on the packaging box 200 to improve the smoothness of the conveying, the conveying device 20 also includes conveying rollers 22, and a plurality of conveying rollers 22 can be arranged equidistantly on the conveying path along the conveying direction of the two conveyor belts 21.

[0034] See also Figures 1 to 3 The carton sealing machine 100 of the present invention further includes a sealing device 50, which is arranged on the lower side or / and upper side of the conveying device 20, and is used to stick a straight-line adhesive tape 500 on the bottom cover 203 or / and the top cover of the packaging box 200. Specifically, in this embodiment, a forming position 20a and a sealing position 20b are sequentially arranged on the conveying device 20 along its conveying direction, and a sealing device 50 is respectively arranged at the forming position 20a and the sealing position 20b. Among them, the sealing device 50 arranged at the forming position 20a is located at the lower side of the conveying device 20, and is used to stick a straight-line adhesive tape 500 on the bottom cover 203 of the packaging box 200. The bending device 30 is located at the upper side of the conveying device 20 at the forming position 20a, and the layout is more compact. The sealing device 50 arranged at the sealing position 20b is located at the upper side of the conveying device 20, and is used to stick a straight-line adhesive tape 500 on the top cover.

[0035] Specifically, the sealing device 50 includes a tray 51, a guiding wheel 52 and a cutter 53. The linear tape 500 is loaded on the tray 51, and its free end is wound around the guiding wheel 52. The guiding wheel 52 is arranged to be telescopic relative to the conveying device 20 and the cutter 53. The guiding wheel 52 can rotate or move relative to the packaging box 200, so as to telescopically approach or move away from the packaging box 200, so that the linear tape 500 adhered thereto can be adhered to the packaging box 200, and as the packaging box 200 moves, it fits on the bottom cover 203 or the top cover of the packaging box 200 to form a sealing section. The cutter 53 can rotate or move relative to the packaging box 200, so as to telescopically approach or move away from the packaging box 200 to separate the sealing section on the packaging box 200 from the linear tape 500. Preferably, the cutting edge of the cutter 53 is arranged to be hidden and will only be exposed when cutting operation is required, thereby improving the safety of use. Among them, the structures of the two-station sealing devices 50 are generally the same, but only adaptively adjusted according to the set positions.

[0036] More specifically, the plurality of conveying rollers 22 arranged at the forming position 20a in the conveying device 20 are set shorter relative to the other conveying rollers 22, so as to form an avoidance space for arranging the sealing device 50 at this station. When the packaging box 200 is conveyed to the forming position 20a on the conveying device 20 and abuts against the guiding wheel 52, the linear tape 500 on the guiding wheel 52 can be adhered to the front end of the bottom cover 203 of the packaging box 200. Then, as the packaging box 200 moves, under the action of its pressing force, the guiding wheel 52 moves or rotates relatively to shrink to a position flush with the bottom cover 203 of the packaging box 200, and then the linear tape 500 is adhesively connected through the bottom cover 203 of the packaging box 200. During the process of the packaging box 200 leaving this station, the pressing on the guiding wheel 52 can be released, and the guiding wheel 52 moves reversely and extends to reset. At the same time, the cutter 53 can move or rotate relatively to extend under the action of the pressing force of the packaging box 200 or the linkage force of the guiding wheel 52 until its hidden cutting edge abuts against the sealing section adhered to the bottom cover 203 of the packaging box 200, thereby cutting off the connection between the sealing section and the linear tape 500.

[0037] Refer to Figures 4 to 9 , the bending device 30 includes a first bending mechanism 31 and a second bending mechanism 32 respectively arranged outside the two short sides 201 and a third bending mechanism 33 arranged outside the two long sides 202. The first bending mechanism 31 and the second bending mechanism 32 can synchronously bend the short side 201 opposite to them. In order to optimize the structure, the specific structures of the first bending mechanism 31 and the second bending mechanism 32 may not be the same. The third bending mechanism 33 is used to synchronously bend the two long sides 202.

[0038] Combined with Figures 4 to 6, the first bending mechanism 31 includes a first mounting plate 311, a first linear driver 312, a first rack 313 and a first gear 314 that are meshed with each other, and a first pressing plate 315. The first linear driver 312 is installed on the first mounting plate 311. The first rack 313 is connected to the output end of the first linear driver 312. The first pressing plate 315 is rotatably installed on the first mounting plate 311, and the rotation axis of the first pressing plate 315 is connected to the first gear 314. Then, driven by the first linear driver 312, the first rack 313 can move linearly up and down, thereby driving the first gear 314 to rotate. The rotating first gear 314 drives the first pressing plate 315 connected thereto to swing up and down, so as to approach or move away from the short side 201 opposite thereto, and bend it.

[0039] Specifically, the bending device 30 further includes a first linear module 34 that drives the first bending mechanism 31 to move linearly in the vertical direction perpendicular to the working platform 10 and in the transverse width direction of the working platform 10, so as to approach or move away from the packing box 200 as a whole. Specifically, the first mounting plate 311 is connected to the output end of the first linear module 34.

[0040] Combined with Figure 2 , Figure 4 , Figure 6 and Figure 7 , the second bending mechanism 32 includes a second mounting plate 321, a first rotary driver 322, a synchronous belt 323 and a second pressing plate 324. The first rotary driver 322 is installed on the upper side of the second mounting plate 321. The second pressing plate 324 is rotatably installed on the lower side of the second mounting plate 321. The synchronous belt 323 is sleeved on the output shaft of the first rotary driver 322 and the rotation axis of the second pressing plate 324. Then, driven by the first rotary driver 322, the second pressing plate 324 can swing up and down, so as to approach or move away from the short side 201 opposite thereto, and bend it.

[0041] Specifically, the bending device 30 further includes a second linear module 35 that drives the second bending mechanism 32 to move linearly in the vertical direction perpendicular to the working platform 10. The second mounting plate 321 is connected to the output end of the second linear module 35. Preferably, both ends of the second linear module 35 are installed on the working platform 10 along the transverse width direction of the working platform 10 through two support frames 351. One end of the first linear module 34 is installed on the working platform 10 through a support frame 341, and the other end thereof is installed on the support frame 351 of the second linear module 35 along the transverse width direction of the working platform 10, thereby further simplifying the structure and making the overall structure of the machine more compact.

[0042] Combined with Figure 2 , Figure 4 , Figure 8 and Figure 9The third bending mechanism 33 includes a third mounting plate 331, a second rotation driver 332, a second gear 333, a second rack 334 and a third pressing plate 335. The second rotation driver 332 is arranged at the relative center of the top of the third mounting plate 331, and its output end passes through the third mounting plate 331 and is located at the bottom of the third mounting plate 331. The second gear 333 is connected to the output end of the second rotation driver 332 and is located at the bottom of the third mounting plate 331. The left and right opposite sides of the second gear 333 are respectively engaged with a second rack 334, and the two second racks 334 are symmetrically slidably arranged on the two opposite sides of the bottom end of the third mounting plate 331 with the second gear 333 as the center. The two third pressing plates 335 are connected to the two second racks 334 in a one-to-one correspondence. The second rotary driver 332 can drive the second gear 333 to rotate, so that the two second racks 334 slide toward or away from each other on the third mounting plate 331, thereby driving the two third pressing plates 335 to synchronously approach or move away from their respective opposite long sides 202 to synchronously bend the two long sides 202.

[0043] Specifically, the bending device 30 also includes a linear module that drives the third bending mechanism 33 to move linearly in a vertical direction perpendicular to the working platform 10, and the third mounting plate 331 can be connected to the output end of the linear module. Preferably, the third mounting plate 331 is connected to the output end of the second linear module 35, and is arranged in a staggered manner with the second mounting plate 321 of the second bending mechanism 32, thereby further simplifying the structure and making the whole machine structure more compact. Preferably, the third mounting plate 331 is connected to the output end of the second linear module 35, and the second mounting plate 321 is installed on the third mounting plate 331, thereby further optimizing the structure and reducing the volume of the whole machine. In addition, when the packaging box 200 enters the machine from the side close to the second bending mechanism 32 and leaves the machine from the side with the safety grating 23, in order to avoid, the second bending mechanism 32 also includes a driver that drives the second mounting plate 321 to move linearly in the horizontal width direction of the working platform 10, so that the packaging box 200 before bending can be smoothly conveyed on the conveying device 20.

[0044] Combination Figures 10 to 12 The labeling device 40 includes a label receiving platform 41, a labeling head 42, a labeling machine 43 and a label supply tray 44. The label receiving platform 41 is provided with placement areas 411 and 412 corresponding to the shapes of the labels 300 and 400, and the labeling head 42 is provided with placement areas 421 and 422 corresponding to the shapes of the labels 300 and 400. For the convenience of description, Figure 10 The middle resettlement area 411 and the resettlement area 412 are indicated by dashed lines. Figure 11The resettlement area 421 and the resettlement area 422 are indicated by a dashed box. Then, the label receiving platform 41 can be driven by the third linear module 45 to move back and forth among the labeling machine 43, the labeling head 2, and the label supply tray 44, and is used to alternately transfer the label 300 received from the labeling machine 43 and the label 400 received from the label supply tray 44 to the lower part of the labeling head 42. The labeling head 42 can be driven by the driving module 46 to move back and forth between the label receiving platform 41 and the conveying device 20, and is used to alternately or synchronously attach the label 300 and the label 400 to the corresponding positions of the packaging box 200.

[0045] Combined with Figure 5 and Figure 12 , in order to further optimize the structure, the driving module 46 can be connected to the output end of the first linear module 34, specifically, it can be connected to the lower side end of the first mounting plate 311, so that the labeling head 42 can move back and forth between the label receiving platform 41 and the conveying device 20 under the drive of the first linear module 34 to complete the corresponding actions. When labeling the top of the packaging box 200, the driving module 46 is a linear module. When it is necessary to label the side of the packaging box 200, the driving module 46 further includes a rotary driver, so as to drive the labeling head 42 to rotate by 90°, so as to pick up and attach the label.

[0046] The following combines Figures 1 to 12 , and explains the working principle of the sealing machine 100 of the present invention:

[0047] After the equipment is started, when the packaging box 200 enters the machine, the sensor located at the starting end of the conveying device 20 sends a signal to the control system. Under the instruction of the control system, the second bending mechanism 32 moves laterally to avoid, and after the packaging box 200 passes, the second bending mechanism 32 resets; when the packaging box 200 is conveyed to the forming position 20a, the sensor located here sends a signal, and the conveying device 20 stops conveying the packaging box 200; the first bending mechanism 31 and the second bending mechanism 32 act synchronously to press and fold the two short sides 201 towards the direction of the box opening, so as to form an inner cover for protecting the products in the box once.

[0048] After that, the first bending mechanism 31 and the second bending mechanism 32 can reset, or can remain in the pressing position. The third bending mechanism 33 starts to act, and synchronously presses and folds the two long sides 202 towards the direction of the inner cover, so as to form a top cover for protecting the products in the box twice. During this process, the first bending mechanism 31 and the second bending mechanism 32 gradually reset; after the bending and forming, the bending device 30 sends a signal to the control system. Under the instruction of the control system, the third bending mechanism 33 resets or remains in the pressing position, and the labeling device 40 acts, so as to alternately or synchronously attach the label 300 and the label 400 to the corresponding positions of the packaging box 200;

[0049] After the labeling is completed, the labeling device 40 sends a signal to the control system. Under the instruction of the control system, the third bending mechanism 33 resets at this time, and the conveying device 20 conveys the bent and formed packaging box 200 towards the sealing position 20b; and during the process of the packaging box 200 entering and leaving the forming position 20a, the sealing device 50 located at the bottom operates to complete the sealing of a straight tape 500 at the center of the bottom cover 203; during the process of the packaging box 200 entering and leaving the sealing position 20b, the sealing device 50 located at the top operates to complete the sealing of a straight tape 500 at the center docking position of the top cover formed by the two long sides 202; when the top cover sealing is completed, the packaging box 200 is just conveyed to the safety grating 23 for discharging;

[0050] By continuously repeating the above operations, the automated assembly line operations of bending and forming, sealing, and attaching multiple labels to the packaging box 200 with double-layer covers can be achieved.

[0051] Compared with the prior art, the carton sealer 100 provided by the present invention rotates and moves relative to the packaging box 200 through the bending device 30 installed above the conveying device 20 and around the mouth of the packaging box 200, and correspondingly bends the two opposite short sides 201 and the two opposite long sides 202 at the box mouth towards the direction close to the box mouth to form an inner cover and a top cover for closing the box mouth, so as to efficiently achieve the bending and forming of the packaging box 200 with double-layer covers; and after the formed packaging box 200, the labeling device 40 installed beside the conveying device 20 moves linearly back and forth relative to the packaging box 200, and efficiently and automatically attaches the labels 300 and 400 with different identification functions to the packaging box 200. The whole machine has a simple structure and a reasonable layout, effectively shortening the moving stroke between devices, thereby realizing the automated assembly line operations of bending and forming, sealing, and attaching multiple labels to the packaging box 200, effectively improving the production efficiency, and correspondingly reducing the manufacturing cost.

[0052] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A carton sealing machine, characterized in that, It includes a working platform, a conveying device arranged along the longitudinal length of the working platform, a bending device erected above the conveying device, and a labeling device located beside the conveying device. The conveying device is used to convey the packing box with the opening facing upwards to the bending device. The bending device is located on the periphery of the box opening of the packing box and makes a rotational movement and a linear movement towards or away from the packing box. The bending device in the rotational movement drives the two opposite short sides at the box opening of the packing box to bend towards the direction close to the box opening to form an inner cover for closing the box opening. The bending device in the linear movement drives the two opposite long sides at the box opening of the packing box to bend towards the direction close to the box opening, and a top cover for closing the box opening is formed at the upper end of the inner cover. The labeling device makes a linear reciprocating movement relative to the packing box and is used to attach two kinds of labels to the corresponding positions of the packing box. The conveying device is also used to convey the labeled packing box for discharging. The bending device includes a first bending mechanism and a second bending mechanism respectively arranged outside the two short sides and a third bending mechanism arranged outside the two long sides. The first bending mechanism and the second bending mechanism can synchronously bend the short sides opposite to them. The third bending mechanism is used to synchronously bend the two long sides. The labeling device includes a label receiving table, a labeling head, a marking machine, and a label supply tray. Two placement areas corresponding to the shapes of the two kinds of labels are respectively arranged on the label receiving table and the labeling head. The label receiving table makes a linear reciprocating movement among the marking machine, the labeling head, and the label supply tray, and is used to alternately transfer the two kinds of labels received from the marking machine and the label supply tray to the lower part of the labeling head. The labeling head shuttles between the label receiving table and the conveying device and is used to alternately or synchronously attach the two kinds of labels to the corresponding positions of the packing box.

2. The carton sealing machine according to claim 1, wherein, The conveying device includes two conveyor belts arranged side by side at a certain interval. The two conveyor belts cooperate with each other to form a conveying path therebetween for conveying the packing box.

3. The case sealer according to claim 2, characterized in that, The conveying device also includes conveying rollers. A plurality of the conveying rollers are arranged at equal intervals along the conveying direction of the conveyor belt on the conveying path.

4. The carton sealing machine according to claim 1, wherein The structures of the first bending mechanism and the second bending mechanism are different.

5. The case sealer according to claim 4, characterized in that, The first bending mechanism includes a first mounting plate, a first linear driver, a first rack and a first gear that are engaged with each other, and a first pressing plate. The first linear driver is installed on the first mounting plate. The first rack is connected to the output end of the first linear driver. The first pressing plate is rotatably installed on the first mounting plate, and the rotation axis of the first pressing plate is connected to the first gear.

6. The case sealer according to claim 4, wherein The second bending mechanism includes a second mounting plate, a first rotary driver, a synchronous belt, and a second pressing plate. The first rotary driver is installed on the upper side opposite to the second mounting plate. The second pressing plate is rotatably installed on the lower side opposite to the second mounting plate. The synchronous belt is sleeved on the output shaft of the first rotary driver and the rotation axis of the second pressing plate.

7. The case sealer according to claim 4, wherein The third bending mechanism includes a third mounting plate, a second rotary driver, a second gear, a second rack and a third pressing plate. The second rotary driver is arranged at the relative center of the third mounting plate. The second gear is connected to the output end of the second rotary driver. Each of the two opposite sides of the second gear meshes with a second rack, and the two second racks are symmetrically arranged with the second gear as the center and slidably arranged on the two opposite sides of the third mounting plate. The two third pressing plates are correspondingly connected to the two second racks respectively.

8. The case sealer according to claim 1, wherein, It further includes a sealing device which is arranged below and / or above the conveying device and is used for pasting a straight tape on the bottom cover and / or the top cover of the packing box.

9. The case sealer according to claim 8, wherein, The sealing device includes a tape reel, a guide wheel and a cutter. The tape is loaded on the tape reel and its free end is wound around the guide wheel. The guide wheel and the cutter are arranged to be telescopic relative to the conveying device. The guide wheel moves or rotates relative to the packing box to extend close to or away from the packing box, so that the straight tape is adhered to the packing box and forms a sealing section along with the movement of the packing box. The cutter moves or rotates relative to the packing box to extend close to or away from the packing box, so as to separate the sealing section from the straight tape.

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