Automatic dotting marking device for cartons

Abstract

The utility model discloses an automatic dot marking device for cartons, belonging to the field of automation technology. The device comprises a left-handed marking machine, a right-handed marking machine, a conveying structure arranged in a front-back direction, a left marking platform and a right marking platform, wherein the left marking platform comprises a left bracket, a left photoelectric sensor, a left solenoid valve, a left mounting plate and a left slide cylinder, and the right marking platform comprises a right bracket, a flip frame, a right photoelectric sensor, a right solenoid valve, a right mounting plate and a right slide cylinder, when the left photoelectric sensor is triggered by a carton, the label pressing paper wheel of the left-handed marking machine is at a position to be labeled, the left slide cylinder is extended, and the label pressing paper wheel of the left-handed marking machine is pressed against the left side of the carton; the outer end of the flip frame is arranged on the right bracket through a rotating shaft, and the flip frame can be turned upward by 180°; when the right photoelectric sensor is triggered by a carton, the label pressing paper wheel of the right-handed marking machine is at a position to be labeled, the right slide cylinder is extended, and the label pressing paper wheel of the right-handed marking machine is pressed against the right side of the carton.

Description

Technical Field

[0001] The utility model belongs to the field of automation technology, and particularly relates to an automatic dot marking device for a carton. Background Art

[0002] Hygiene products can be packed into cartons and then sent to the sterilization room for sterilization. In order to distinguish the unsterilized state, a handheld marking machine can be used to mark the carton with red dots on one or both sides.

[0003] The structure of the existing handheld marking machine can be found in the description of application number CN202211375817.8. The patent discloses a small electric handheld expandable low-power adjustable speed labeling instrument, including a shell, a storage wheel, an automatic paper stop sensor, a label paper stripping plate, a label paper pressing wheel, a material collection wheel, a paper guide column, a power switch, a rotating lever, a support rod, a lever support column, a battery module, a motor, a control circuit module, a paper output sensing module, a label paper baffle and a slide rail; the storage wheel, the automatic paper stop sensor, the label paper stripping plate, the paper guide column, the power switch, the rotating lever, the battery module, the motor and the slide rail are installed on the outer wall of the shell, and the lever support column and the control circuit module are installed inside the shell; the storage wheel is used to load rolled label paper; the automatic paper stop sensor is movably connected to the slide rail through a positioning bolt, and the automatic paper stop sensor is used to sense the change in the thickness of the label paper. When the thickness change exceeds a threshold, a trigger signal is generated to trigger the motor to stop rotating; the label paper stripping plate is used to realize the stripping of the label face paper and the label backing paper; the rotating lever is rotatably installed on the head of the shell through the lever support column, and a handle is provided at the tail of the shell, and the end of the handle The battery module is installed at the end; the front end of the rotating lever is connected with the support rod, and the support rod is used to support the label paper pressing wheel; the label paper pressing wheel is used to press the peeled label face paper onto the object to be pasted; the rotating shaft of the motor is fixedly connected to the receiving wheel and drives the receiving wheel to rotate; the receiving wheel recycles the generated label base paper by rotating; the paper guide column is used to guide the moving path of the label paper; the power switch is electrically connected to the battery module and the control circuit module; the control circuit module is electrically connected to the automatic paper stop sensor, the motor and the paper output sensing module; the label paper baffle is arranged at one end of the storage wheel to prevent the rolled label paper from sliding off the storage wheel; the paper output sensing module adopts a switch sensor or a distance sensor. When the paper output sensing module adopts a switch sensor, the switch sensor is installed at the end of the rotating lever, and the rotating lever rotates with the lever support column as the rotating shaft; when the paper output sensing module adopts a distance sensor, the distance sensor is connected to the control circuit module through a wire, and the distance sensor is installed on the platform where the conveyor belt is located.

[0004] In the prior art, two operators (operating two handheld labeling machines respectively) can be used to manually label the left and right sides of the carton on the output structure of the carton unpacking device, which is not only time-consuming and labor-intensive, but also may cause labeling leaks. Utility Model Content

[0005] In order to solve the above problems, the embodiment of the utility model provides an automatic dot marking device for cartons, which uses the existing handheld labeling machine to realize automatic labeling of cartons, saving labor and preventing labeling leaks. The technical solution is as follows:

[0006] The utility model embodiment provides an automatic dot marking device for a carton, which includes a left-handed marking machine 3, a right-handed marking machine 4, a conveying structure 1 arranged in a front-to-back direction, a left marking platform and a right marking platform, wherein the left marking platform includes a left bracket 31, a left photoelectric sensor 32, a left solenoid valve 33, a left mounting plate 34 and a left slide cylinder, and the right marking platform includes a right bracket 41, a flip frame 46, a right photoelectric sensor 42, a right solenoid valve 43, a right mounting plate 44 and a right slide cylinder, wherein the left bracket 31 and the right bracket 41 are respectively located on the left and right sides of the conveying structure 1, and the left photoelectric sensor 3 2 and the right photoelectric sensor 42 are both arranged in the left-right direction and are respectively located on the outside of the corresponding side of the carton 2, the left mounting plate 34 and the right mounting plate 44 are both arranged horizontally and are located above the conveying structure 1, and the left slide cylinder and the right slide cylinder are both arranged in the left-right direction; the left slide cylinder is arranged on the left bracket 31 and a left solenoid valve 33 is arranged on its air supply pipe, and the left mounting plate 34 is arranged on the upper side of the slide of the left slide cylinder; the left hand-held marking machine 3 is arranged in the front-back direction, it is arranged on the upper side of the left mounting plate 34, its label paper pressing wheel is located at the front end, its label paper baffle is located on the upper side, and it is located on the outside of the left side of the carton 2; The left photoelectric sensor 32 is located in front of or behind the left bracket 31 and is electrically connected to the left solenoid valve 33; when the left photoelectric sensor 32 is triggered by the carton 2, the label pressing paper wheel of the left handheld marking machine 3 is at the position to be labeled, the left slide cylinder extends, and the left handheld marking machine 3 moves inward to allow its label pressing paper wheel to press against the left side of the carton 2; the turning frame 46 is arranged in the left and right directions and its outer end is rotatably arranged on the right bracket 41 through a front-to-back rotating shaft, and it can be turned upward by 180°; the right slide cylinder is arranged on the lower side of the turning frame 46 and a right solenoid valve 43 is provided on its air supply pipe, and the right The mounting plate 44 is arranged on the lower side of the slide of the right slide cylinder; the right-hand-held marking machine 4 is arranged in the front-to-back direction, and is arranged on the lower side of the right mounting plate 44, with its label paper pressing wheel located at the front end, and its label paper baffle located at the lower side, and is located on the outer side of the right side of the carton 2; the right photoelectric sensor 42 is located directly in front of or behind the right bracket 41 and is electrically connected to the right solenoid valve 43; when the right photoelectric sensor 43 is triggered by the carton 2, the label paper pressing wheel of the right-hand-held marking machine 4 is at the position to be labeled, the right slide cylinder extends, and the right-hand-held marking machine 4 moves inward to allow its label paper pressing wheel to press against the right side of the carton 2.

[0007] Furthermore, the left bracket 31 and the right bracket 41 in the embodiment of the utility model are both movable brackets and are provided with pulleys at the bottom thereof, and the left marking platform and / or the right marking platform can be moved away from the corresponding side of the conveying structure 1 .

[0008] Specifically, the left photoelectric sensor 32 in the embodiment of the utility model is located directly in front of the left bracket 31, the distance between the left photoelectric sensor 32 and the label paper pressing wheel of the left hand-held marking machine 3 is L1, the distance between the front end of the carton 2 and the position to be labeled on the left side of the carton 2 is L2, and L1=L2; the right photoelectric sensor 42 is located directly in front of the right bracket 41, the distance between the right photoelectric sensor 42 and the label paper pressing wheel of the right hand-held marking machine 4 is L3, the distance between the front end of the carton 2 and the position to be labeled on the right side of the carton 2 is L4, and L3=L4.

[0009] Specifically, the lower side of the inner end of the left mounting plate 34 in the embodiment of the utility model is arranged on the upper side of the slide of the left slide cylinder, and the left-handed marking machine 3 is arranged on the upper side of the inner end of the left mounting plate 34; the upper side of the inner end of the right mounting plate 44 is arranged on the lower side of the slide of the right slide cylinder, and the right-handed marking machine 4 is arranged on the lower side of the inner end of the right mounting plate 44; the left solenoid valve 33 is arranged on the upper side of the left mounting plate 34 and is located on the outside of the left-handed marking machine 3, and the right solenoid valve 43 is arranged on the lower side of the right mounting plate 44 and is located on the outside of the right-handed marking machine 4.

[0010] Furthermore, the left bracket 31 and the right bracket 41 in the embodiment of the utility model are both frame structures, and the inner sides of the left longitudinal fixing rod 35 and the right longitudinal fixing rod 45 are respectively provided; the left longitudinal fixing rod 35 and the right longitudinal fixing rod 45 are both arranged in the front-to-back direction, and are located on the outer sides of the corresponding sides of the carton 2, and are both located above the conveying structure 1; the left photoelectric sensor 32 and the right photoelectric sensor 42 are respectively arranged on the left longitudinal fixing rod 35 and the right longitudinal fixing rod 45.

[0011] The right bracket 41 in the embodiment of the utility model includes a base 11, two columns 12 on the base 11 and arranged side by side front and back, a crossbeam 13 between the upper parts of the two columns 12 and arranged in the front-to-back direction, two transverse fixing rods 14 arranged side by side front and back, and two support arms 15 arranged side by side front and back. The flip frame 46 is an outwardly open U-shaped structure and includes two transverse arms arranged side by side front and back and a longitudinal arm arranged in the front-to-back direction on the upper sides of the inner ends of the two transverse arms. The transverse fixing rod 14, the support arm 15 and the transverse arm are all arranged in the left and right direction, and the right slide cylinder is arranged on the lower side of the longitudinal arm; the two columns 12 are respectively located in the adjacent front and adjacent rear of the flip frame 46 and are arranged vertically. The two transverse fixing rods 14 are respectively fixed on the side of the two columns 12 away from the turning frame 46, and the right longitudinal fixing rod 45 is fixed on the inner ends of the two transverse fixing rods 14; the middle parts of the two support arms 15 are respectively fixed on the side of the two columns 12 close to the turning frame 46, which are located directly below the transverse arms on the corresponding sides, and are fixed on the upper side of the crossbeam 13; the outer ends of the transverse arms are rotatably arranged on the columns 12 on the corresponding sides through the rotating shafts, and the middle parts thereof are provided with support pins 16, and the support pins 16 penetrate the transverse arms in the vertical direction; the lower ends of the support pins 16 are pressed against the upper inner ends of the support arms 15 on the corresponding sides; after the turning frame 46 is turned over 180°, the other ends of the support pins 16 become the lower ends and are pressed against the upper outer ends of the support arms 15 on the corresponding sides.

[0012] Specifically, the left mounting plate 34 and the right mounting plate 44 in the embodiment of the utility model are both rectangular plates arranged horizontally in the left-right direction.

[0013] The left marking platform and the right marking platform in the embodiment of the utility model are staggered in front and back, and the left photoelectric sensor 32 and the right photoelectric sensor 42 are triggered at the same time.

[0014] Among them, the conveying structure 1 in the embodiment of the utility model is the output structure of the carton unpacking device and it is a guide roller conveying structure.

[0015] The beneficial effects of the technical solution provided by the embodiment of the utility model are as follows: the embodiment of the utility model provides an automatic dot marking device for cartons, which uses an existing handheld marking machine to realize automatic labeling of cartons, saves labor, and does not miss labeling. The left marking platform and the right marking platform adopt different structures, and a turning frame is provided on the right marking platform to allow the right-handed marking machine on it to turn upward, so that both the left-handed marking machine and the right-handed marking machine can easily replace the tape. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of the automatic dot marking device for cartons in this embodiment;

[0017] Figure 2 yes Figure 1 A schematic diagram of the structure after the turning frame is turned 180°;

[0018] Figure 3 yes Figure 1 Structural diagram of the marking machine when working with the left hand;

[0019] Figure 4 yes Figure 1 Structural diagram of the marking machine when working with the right hand;

[0020] Figure 5 yes Figure 1 A partial enlarged view of the marking machine held by the right hand in the middle;

[0021] Figure 6 yes Figure 2 A partial enlarged view of the marking machine held by the right hand in the middle;

[0022] Figure 7 It is a structural diagram of the right marking platform;

[0023] Figure 8 yes Figure 7 Schematic diagram of the structure after the flip frame is flipped 180°.

[0024] In the figure: 1 conveying structure, 2 carton, 3 left hand holding marking machine, 4 right hand holding marking machine;

[0025] 11 base, 12 column, 13 beam, 14 transverse fixing rod, 15 support arm, 16 support pin;

[0026] 31 left bracket, 32 left photoelectric sensor, 33 left solenoid valve, 34 left mounting plate, 35 left longitudinal fixing rod;

[0027] 41 right bracket, 42 right photoelectric sensor, 43 right solenoid valve, 44 right mounting plate, 45 right longitudinal fixing rod, 46 flip frame. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0029] Example 1

[0030] See also Figure 1-8Embodiment 1 provides an automatic dot marking device for cartons, which includes a left-handed marking machine 3, a right-handed marking machine 4, a conveying structure 1, a left marking platform and a right marking platform, etc. Among them, the conveying structure 1 is arranged in the front-to-back direction, which is specifically the output structure of the carton unpacking device, which is specifically a guide roller conveying structure. The left marking platform and the right marking platform are respectively located on the left and right sides of the conveying structure 1. The left-handed marking machine 3 and the right-handed marking machine 4 are both existing handheld marking machines. For details, please refer to the patent with application number CN202211375817.8. The handheld marking machine can automatically sense paper output. In this embodiment, red dot stickers are affixed to one side or both sides (preferably) of the carton for marking.

[0031] The left marking platform includes a left bracket 31, a left photoelectric sensor 32, a left solenoid valve 33, a left mounting plate 34, a left slide cylinder and a left longitudinal fixing rod 35. The left bracket 31 is located on the left side of the conveying structure 1, which can be a frame structure. The left mounting plate 34 is horizontally arranged in the left-right direction, and is located above the conveying structure 1, and is a rectangular plate. The left slide cylinder is arranged in the left-right direction, and is arranged on the left bracket 31, and the air supply pipe (connected to the compressed air supply device) is provided with a left solenoid valve 33. The left mounting plate 34 is arranged on the upper side of the slide of the left slide cylinder. The left handheld marking machine 3 is arranged in the front-back direction, and is arranged on the upper side of the left mounting plate 34, and its label paper pressing wheel is located at the front end, and its label paper baffle is located on the upper side to facilitate the replacement of the tape, and its working surface faces right, and is located on the outer side of the left side of the carton 2. The left longitudinal fixing rod 35 is arranged on the inner side of the left bracket 31, and is arranged in the front-back direction, and is located above the conveying structure 1, and is located on the outer side of the left side of the carton 2. The left photoelectric sensor 32 is arranged in the left-right direction, and is arranged to the right, and is located on the outer side of the left side of the carton 2. It is fixed on the left longitudinal fixing rod 35 (specifically the front part), and is located directly in front of or directly behind the left bracket 31, and is electrically connected to the left solenoid valve 33. Specifically, the lower side of the inner end of the left mounting plate 34 is arranged on the upper side of the slide of the left slide cylinder, the left handheld marking machine 3 is arranged on the upper side of the inner end of the left mounting plate 34, and the left solenoid valve 33 (specifically arranged in the front-back direction) is arranged on the upper side of the left mounting plate 34 and is located on the outer side of the left handheld marking machine 3.

[0032] When the left photoelectric sensor 32 is triggered by the carton 2 (front or rear end), the label pressing wheel of the left-handed marking machine 3 is at the labeling position, the left slide cylinder extends, and the left-handed marking machine 3 moves inward to allow its label pressing wheel to press against the left side of the carton 2 (at the same time, the sensor on the left-handed marking machine 3 is triggered, and the left-handed marking machine 3 starts working). After labeling is completed, the left slide cylinder retracts.

[0033] Among them, the right marking platform includes a right bracket 41, a flip frame 46, a right photoelectric sensor 42, a right solenoid valve 43, a right mounting plate 44, a right slide cylinder and a right longitudinal fixing rod 45. The right bracket 41 is located on the right side of the conveying structure 1, and can be specifically a frame structure. The flip frame 46 is arranged in the left-right direction, and its outer end is rotated on the right bracket 41 through a front-back rotating shaft. It can be turned up 180° to replace the tape on the right-handed marking machine 4. The right slide cylinder is arranged in the left-right direction, and it is arranged on the lower side of the flip frame 46. The right solenoid valve 43 is arranged on its air supply pipe (connected to the compressed air supply device). The right mounting plate 44 is arranged horizontally in the left-right direction, and it is located above the conveying structure 1. It is specifically a rectangular plate, and it is arranged on the upper side of the slide of the left slide cylinder. The right-hand-held marking machine 4 is arranged along the front-to-back direction, and is arranged on the lower side of the right mounting plate 44. Its label paper pressing wheel is located at the front end, and its label paper baffle is located at the lower side (located at the upper side after turning 180° to replace the tape), and its working surface faces left, and is located on the outside of the right side of the carton 2. The right longitudinal fixing rod 45 is arranged on the inner side of the right bracket 41, and is arranged along the front-to-back direction, and is located above the conveying structure 1, and is located on the outside of the right side of the carton 2. The right photoelectric sensor 42 is arranged along the left-to-right direction, and is arranged to the left, and is located on the outside of the right side of the carton 2. It is fixed on the right longitudinal fixing rod 45 (specifically the front part), and is located directly in front of or directly behind the right bracket 41, and is electrically connected to the right solenoid valve 43. Specifically, the upper side of the inner end of the right mounting plate 44 is arranged on the lower side of the slide of the right slide cylinder, the right hand-held marking machine 4 is arranged on the lower side of the inner end of the right mounting plate 44, and the right solenoid valve 43 (specifically arranged in the front-to-back direction) is arranged on the lower side of the right mounting plate 44 and is located on the outside of the right hand-held marking machine 4.

[0034] When the right photoelectric sensor 42 is triggered by the carton 2 (front end or rear end), the label pressing wheel of the right-hand-held labeling machine 4 is at the labeling position, the right slide cylinder extends, and the right-hand-held labeling machine 4 moves inward to allow its label pressing wheel to press against the right side of the carton 2 (at the same time, the sensor on the right-hand-held labeling machine 4 is triggered, and the right-hand-held labeling machine 4 starts working). After labeling is completed, the right slide cylinder retracts.

[0035] Specifically, the left photoelectric sensor 32 in the embodiment of the utility model is located in front of the left bracket 31, the distance between the left photoelectric sensor 32 and the label pressing wheel of the left hand-held marking machine 3 is L1, the distance between the front end of the carton 2 and the position to be labeled on the left side of the carton 2 is L2, and L1 = L2. The right photoelectric sensor 42 is located in front of the right bracket 41, the distance between the right photoelectric sensor 42 and the label pressing wheel of the right hand-held marking machine 4 is L3, the distance between the front end of the carton 2 and the position to be labeled on the right side of the carton 2 is L4, and L3 = L4.

[0036] Among them, the right bracket 41 in the embodiment of the utility model includes a base 11, a cross beam 13, two columns 12, two transverse fixing rods 14, two support arms 15, etc. The base 11 is located on the right side of the conveying structure 1, and specifically, it can be a movable base. The two columns 12 are arranged side by side in the front and rear on the base 11, and are respectively located in front of and behind the adjacent sides of the turnover frame 46, and they are both vertically arranged. The cross beam 13 is arranged in the front-rear direction and is arranged between the upper parts of the two columns 12. The turnover frame 46 is a U-shaped structure with an outward opening, and it includes two transverse arms arranged side by side in the front and rear (arranged in the left-right direction) and longitudinal arms arranged on the upper sides of the inner ends of the two transverse arms and in the front-rear direction. The transverse fixing rods 14, the support arms 15, and the transverse arms are all arranged in the left-right direction, and the right sliding table cylinder is arranged on the lower side of the longitudinal arm. The two transverse fixing rods 14 are arranged side by side in the front and rear, and are respectively fixed on the sides of the two columns 12 away from the turnover frame 46, and are located above the conveying structure 1. The right longitudinal fixing rod 45 is fixed at the inner ends (specifically, the left ends) of the two transverse fixing rods 14. The two support arms 15 are arranged side by side in the front and rear, and some of them are respectively fixed on the sides of the two columns 12 close to the turnover frame 46 to form a cross-shaped structure, which is located directly below the corresponding transverse arm and is fixed on the upper side of the cross beam 13. The outer ends of the transverse arms are rotatably arranged on the corresponding columns 12 through a rotating shaft, and a support pin 16 is arranged in the middle thereof, and it is arranged close to the corresponding column 12. The support pin 16 penetrates the transverse arm in the vertical direction, and its upper and lower ends respectively penetrate the upper and lower sides of the transverse arm and the penetration distances are equal. The lower end of the support pin 16 abuts against the upper side of the inner end of the corresponding support arm 15. After the turnover frame 46 is turned over by 180°, the other end of the support pin 16 becomes the lower end and abuts against the upper side of the outer end of the corresponding support arm 15.

[0037] Embodiment 2

[0038] Embodiment 2 provides an automatic dot marking device for cartons, and its structure is basically the same as that of Embodiment 1. The difference is that: the left bracket 31 and the right bracket 41 in this embodiment are both movable brackets and pulleys are provided at their bottoms, and the left marking platform is moved away from the left side of the conveying structure 1.

[0039] Embodiment 3

[0040] Embodiment 3 provides an automatic dot marking device for cartons, and its structure is basically the same as that of Embodiment 1. The difference is that: the left bracket 31 and the right bracket 41 in this embodiment are both movable brackets and pulleys are provided at their bottoms, and the right marking platform is moved away from the right side of the conveying structure 1.

[0041] Embodiment 4

[0042] Example 4 provides an automatic dot marking device for cartons, and its structure is basically the same as that of Example 1, except that: the left marking platform and the right marking platform in this embodiment are staggered front to back (the dot markings on both sides of the carton 2 are symmetrical, resulting in the left marking platform and the right marking platform being staggered front to back), the left photoelectric sensor 32 and the right photoelectric sensor 42 are triggered at the same time, at which time, the left-handed marking machine 3 and the right-handed marking machine 4 are pressed against the left and right sides of the carton 2 respectively.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic dot marking device for cartons, comprising a left-hand holding marking machine (3), a right-hand holding marking machine (4) and a conveying structure (1) arranged in a front-to-back direction; characterized in that: It also includes a left marking platform and a right marking platform respectively located on the left and right sides of the conveying structure (1), the left marking platform includes a left bracket (31), a left photoelectric sensor (32), a left solenoid valve (33), a left mounting plate (34) and a left slide cylinder, and the right marking platform includes a right bracket (41), a flip frame (46), a right photoelectric sensor (42), a right solenoid valve (43), a right mounting plate (44) and a right slide cylinder. The left bracket (31) and the right bracket (41) are respectively located on the left and right sides of the conveying structure (1), the left photoelectric sensor (32) and the right photoelectric sensor (42) are both arranged in the left-right direction and are respectively located on the outside of the corresponding side of the carton (2), the left mounting plate (34) and the right mounting plate (44) are both arranged horizontally and are located above the conveying structure (1), and the left slide cylinder and the right slide cylinder are both arranged in the left-right direction; The left slide cylinder is arranged on the left bracket (31) and a left solenoid valve (33) is arranged on its air supply pipe, and the left mounting plate (34) is arranged on the upper side of the slide of the left slide cylinder; the left hand-held marking machine (3) is arranged in the front-back direction, and is arranged on the upper side of the left mounting plate (34), and its label pressing paper wheel is located at the front end, and its label paper baffle is located at the upper side, and it is located on the outer side of the left side of the carton (2); the left photoelectric sensor (32) is located directly in front of or directly behind the left bracket (31) and is electrically connected to the left solenoid valve (33); when the left photoelectric sensor (32) is triggered by the carton (2), the label pressing paper wheel of the left hand-held marking machine (3) is at the position to be labeled, the left slide cylinder extends, and the left hand-held marking machine (3) moves inward to allow its label pressing paper wheel to press against the left side of the carton (2); The flip frame (46) is arranged in the left-right direction and its outer end is rotatably arranged on the right bracket (41) through a front-to-back rotating shaft, and it can flip upward 180°; the right slide cylinder is arranged on the lower side of the flip frame (46) and its air supply pipe is provided with a right electromagnetic valve (43), and the right mounting plate (44) is arranged on the lower side of the slide of the right slide cylinder; the right hand-held marking machine (4) is arranged in the front-to-back direction, and it is arranged on the lower side of the right mounting plate (44), and its label paper pressing wheel is located at the front end, and its label The paper baffle is located at the lower side, which is located on the outside of the right side of the carton (2); the right photoelectric sensor (42) is located directly in front of or directly behind the right bracket (41) and is electrically connected to the right solenoid valve (43); when the right photoelectric sensor (42) is triggered by the carton (2), the label pressing paper wheel of the right hand-held marking machine (4) is at the position to be labeled, the right slide cylinder extends, and the right hand-held marking machine (4) moves inward to allow its label pressing paper wheel to press against the right side of the carton (2).

2. The automatic dot marking device for cartons according to claim 1, characterized in that: The left bracket (31) and the right bracket (41) are both movable brackets and are provided with pulleys at the bottom thereof; the left marking platform and / or the right marking platform can be moved away from the corresponding side of the conveying structure (1).

3. The automatic dot marking device for cartons according to claim 1, characterized in that: The left photoelectric sensor (32) is located directly in front of the left bracket (31), the distance between the left photoelectric sensor (32) and the label pressing wheel of the left handheld marking machine (3) is L1, the distance between the front end of the carton (2) and the position to be labeled on the left side of the carton (2) is L2, and L1=L2; the right photoelectric sensor (42) is located directly in front of the right bracket (41), the distance between the right photoelectric sensor (42) and the label pressing wheel of the right handheld marking machine (4) is L3, the distance between the front end of the carton (2) and the position to be labeled on the right side of the carton (2) is L4, and L3=L4.

4. The automatic dot marking device for cartons according to claim 1, characterized in that: The lower side of the inner end of the left mounting plate (34) is arranged on the upper side of the slide of the left slide cylinder, and the left-handed marking machine (3) is arranged on the upper side of the inner end of the left mounting plate (34); the upper side of the inner end of the right mounting plate (44) is arranged on the lower side of the slide of the right slide cylinder, and the right-handed marking machine (4) is arranged on the lower side of the inner end of the right mounting plate (44); the left solenoid valve (33) is arranged on the upper side of the left mounting plate (34) and is located on the outer side of the left-handed marking machine (3), and the right solenoid valve (43) is arranged on the lower side of the right mounting plate (44) and is located on the outer side of the right-handed marking machine (4).

5. The automatic dot marking device for cartons according to claim 1, characterized in that: The left bracket (31) and the right bracket (41) are both frame structures, and a left longitudinal fixing rod (35) and a right longitudinal fixing rod (45) are respectively arranged on the inner side thereof; the left longitudinal fixing rod (35) and the right longitudinal fixing rod (45) are both arranged in the front-back direction, and are located on the outer side of the corresponding side of the carton (2), and are both located above the conveying structure (1); the left photoelectric sensor (32) and the right photoelectric sensor (42) are respectively arranged on the left longitudinal fixing rod (35) and the right longitudinal fixing rod (45).

6. The automatic dot marking device for cartons according to claim 5, characterized in that: The right bracket (41) comprises a base (11), two columns (12) arranged side by side in the front and back directions on the base (11), a crossbeam (13) arranged between the upper parts of the two columns (12) in the front and back directions, two transverse fixing rods (14) arranged side by side in the front and back directions, and two support arms (15) arranged side by side in the front and back directions. The turning frame (46) is a U-shaped structure open outward and comprises two transverse arms arranged side by side in the front and back directions and longitudinal arms arranged on the upper sides of the inner ends of the two transverse arms in the front and back directions. The transverse fixing rods (14), the support arms (15) and the transverse arms are all arranged in the left and right directions, and the right slide cylinder is arranged on the lower side of the longitudinal arms. The two columns (12) are respectively located at the adjacent front and adjacent rear of the turning frame (46) and are both arranged vertically. The two transverse fixing rods (14) are respectively fixed on the two transverse arms. The right longitudinal fixing rod (45) is fixed to the inner ends of the two transverse fixing rods (14) on the side of the two columns (12) away from the turning frame (46); the middle parts of the two support arms (15) are respectively fixed to the side of the two columns (12) close to the turning frame (46), which are located directly below the transverse arms on the corresponding sides and are fixed to the upper side of the crossbeam (13); the outer ends of the transverse arms are rotatably arranged on the columns (12) on the corresponding sides through a rotating shaft and a supporting pin (16) is arranged in the middle part thereof, and the supporting pin (16) passes through the transverse arm in the vertical direction; the lower end of the supporting pin (16) abuts against the upper side of the inner end of the supporting arm (15) on the corresponding side; after the turning frame (46) is turned over by 180°, the other end of the supporting pin (16) becomes the lower end and abuts against the upper side of the outer end of the supporting arm (15) on the corresponding side.

7. The automatic dot marking device for cartons according to claim 1, characterized in that: The left mounting plate (34) and the right mounting plate (44) are both rectangular plates arranged horizontally in the left-right direction.

8. The automatic dot marking device for cartons according to claim 1, characterized in that: The left marking platform and the right marking platform are staggered in front and back, and the left photoelectric sensor (32) and the right photoelectric sensor (42) are triggered simultaneously.

9. The automatic dot marking device for cartons according to claim 1, characterized in that: The conveying structure (1) is the output structure of the carton unpacking device and is a guide roller conveying structure.

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