Packaging carton silk-screen printing device

Abstract

The utility model relates to the technical field of printing devices, in particular to a packaging carton silk-screen printing device which comprises a base and a lifting mechanism, a cavity is formed in the base, a control panel is installed on the base, the lifting mechanism is arranged in the cavity, a paper placing plate is installed on the lifting mechanism, and the paper placing plate is arranged on the base. And the lifting mechanism is used for lifting the paper placing plate. The surface of a paperboard before printing can be blown by cold air sprayed by the spray head in the blowing mechanism, so that the influence of dust or other pollutants on the surface of the paperboard on subsequent printing is avoided, the printing quality of the paperboard is ensured, and the printing quality of the paperboard is improved. The printed paperboard can be dried through downward movement of the paperboard placing plate and hot air blown out by a second ventilation pipe in the drying mechanism, and the hot air in a cavity is prevented from rising in cooperation with cold air sprayed out by a spray head, so that the drying efficiency of the ink on the paperboard is effectively improved, and the drying efficiency of the ink on the paperboard is improved. And therefore, the paperboard printing efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to printing device technical field especially, relates to a packing carton screen printing device. BACKGROUND

[0002] The packing carton is a kind of paper container for packing, protection, display and transportation commodity, they are usually made of different types of paper or paperboard material, these materials have good foldability, compression resistance and printability, and printing for packing carton is very important, because it directly influences the first impression of product, brand display, information transmission, market competitiveness and consumer's purchase decision, based on this, in the design and manufacturing process of packing carton, printing link cannot be ignored.

[0003] The printing process of existing packing carton is usually carried out before paperboard is folded into the shape of carton, in this process, the surface of paperboard before printing can be attached with dust or other contaminants, if these impurities cannot be effectively removed, will seriously affect the adhesion of printing ink and printing quality, cause printing pattern to be blurred, color to be uneven or produce flaw, however, the existing printing device is mostly only used for printing paperboard, and does not have the cleaning function to the surface of paperboard, thereby affecting the printing quality of paperboard, in addition, after printing is completed, in order to ensure that ink can dry quickly and be fixed on paperboard, usually need to carry out drying treatment, the existing printing device mostly carries out drying to paperboard by hot air, however, hot air is easily affected by environmental airflow after blowing, part of hot air can be lost to the outside of drying chamber, and this hot air loss will reduce drying efficiency, that is, reduces the printing efficiency of paperboard, and practicality is not good. UTILITY MODEL CONTENT

[0004] The utility model aims at solving the problems, in prior art, that printing device mostly does not have the cleaning function to the surface of paperboard and mostly carries out drying to paperboard by hot air, thereby reducing printing quality and printing efficiency of paperboard, and provides a packing carton screen printing device.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A packing carton screen printing device, including base, the inside of base is equipped with cavity, and control panel is installed on base, further including:

[0007] Lifting mechanism, the lifting mechanism is arranged in the cavity, and the lifting mechanism is installed on the paperboard, and the lifting mechanism is used to make the paperboard realize lifting, and the paperboard is placed on the paperboard, the base is symmetrically installed with two groups of paper pressing parts, and the two groups of paper pressing parts are located above the paperboard, and the bottom end of two groups of paper pressing parts is installed with cushion layer, and the cavity top wall is equipped with the through slot for the paperboard to pass through.

[0008] A printing mechanism is arranged at the top end of the base and used for printing the paper sheet on the paper sheet placing plate;

[0009] Two groups of air blowing mechanisms are arranged on the base and the two groups of paper pressing members and respectively located at the two ends of the paper sheet placing plate, the air blowing mechanism comprises a blower and a first air duct, the blower is installed at the top end of the base, the paper pressing member is provided with a groove on the side facing the paper sheet placing plate, the first air duct is installed on the inner wall of the groove and penetrates through the inner wall of the groove at one end and is connected with the output end of the blower, and a plurality of groups of nozzles are uniformly installed on the first air duct;

[0010] Two groups of drying mechanisms are arranged inside the cavity and correspond to the positions of the two groups of air blowing mechanisms, and the drying mechanism is used for blowing hot air to the paper sheet placing plate after moving downward.

[0011] Preferably, the drying mechanism comprises a heating blower, a laser detector and an air exchange port, the heating blower is fixedly installed on the bottom wall of the cavity and is provided with a plurality of groups of second air ducts, the laser detector is installed on the inner wall of the cavity, the positions of the air outlet ends of the plurality of groups of second air ducts correspond to the position of the laser detector, and the air exchange port is arranged through the inner wall of the cavity and corresponds to the position of the heating blower.

[0012] Preferably, the lifting mechanism comprises two groups of telescopic rods, the two groups of telescopic rods are symmetrically installed on the bottom wall of the cavity, and the output ends of the two groups of telescopic rods are fixedly connected with the paper sheet placing plate.

[0013] Preferably, the printing mechanism comprises an adjusting assembly, an installation assembly and two groups of telescopic parts, the adjusting assembly is arranged at the top end of the base, the installation assembly and the two groups of telescopic parts are arranged on the adjusting assembly, the adjusting assembly is used for realizing the translation and lifting of the installation assembly and the two groups of telescopic parts, the installation assembly is detachably provided with a printing screen, the two groups of telescopic parts are respectively provided with two groups of output ends, one group of output ends of the two groups of telescopic parts are jointly connected with an ink pressing plate, the other group of output ends of the two groups of telescopic parts are jointly connected with a scraper, and the ink pressing plate and the scraper are located above the printing screen.

[0014] Preferably, the adjusting assembly comprises a supporting plate, the supporting plate is fixedly installed at the top end of the base, a sliding cavity is formed in the supporting plate, two groups of first sliding grooves are formed through the side of the supporting plate facing the paper placing plate, an electric sliding rod is fixedly installed through the supporting plate, the electric sliding rod is located in the sliding cavity, a sliding piece is installed on the electric sliding rod, two groups of connecting plates are installed on one side of the sliding piece, the two groups of connecting plates extend outward through the two groups of first sliding grooves respectively, and an electric sliding table is connected to the opposite sides of the two groups of connecting plates.

[0015] Preferably, the installing assembly comprises an installing plate, the installing plate is hollow, a second sliding groove is formed at the top end of the installing plate, a clamping groove is formed through the middle of one side of the installing plate, two groups of clamping blocks are slidably connected in the clamping groove, a screw rod is fixedly connected to the top end of each clamping block, the top end of each screw rod extends outward through the second sliding groove, a fixed nut is threadedly connected to each screw rod, the two groups of screw rods are fixed to the installing plate through the fixed nuts, a fixed block is installed on the side of each clamping block facing the paper placing plate, and a fixed plate is connected to each clamping block through the fixed block.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] 1、 through the mutual cooperation of the lifting mechanism, the printing mechanism, the blowing mechanism and the drying mechanism, the cold air sprayed by the nozzle of the blowing mechanism can be used to blow the surface of the paper plate before printing, so that the dust or other pollutants on the surface of the paper plate do not affect the subsequent printing, thereby ensuring the printing quality of the paper plate, and the hot air blown out by the second ventilation pipe of the drying mechanism can be used to dry the ink just printed on the surface of the paper plate, and the cold air sprayed by the nozzle is used to isolate the hot air in the cavity from rising, thereby effectively improving the drying efficiency of the ink on the paper plate and effectively improving the printing efficiency of the paper plate.

[0018] 2、 through the installation of the installing assembly in the printing mechanism, the installation of printing screens of different sizes can be greatly flexible, and the design allows workers to easily replace printing screens of different sizes through simple dismounting and mounting operations, so that the printing screen mounting process is simplified, the flexibility of the printing screen installation is effectively improved, and the printing efficiency of the paper plate is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A side view structural schematic diagram of the packaging carton screen printing device is provided in the utility model;

[0020] Figure 2 A fixed plate and fixed screw mutual cooperation structural schematic diagram of the packaging carton screen printing device is provided in the utility model;

[0021] Figure 3 For Figure 4 An enlarged structural schematic diagram of the middle A is provided;

[0022] Figure 4 A base and telescopic rod mutual cooperation structural schematic diagram of the packaging carton screen printing device is provided in the utility model;

[0023] Figure 5 For Figure 4 An enlarged structural schematic diagram of the middle B is provided;

[0024] Figure 6 A base and laser detector mutual cooperation structural schematic diagram of the packaging carton screen printing device is provided in the utility model.

[0025] In the figure: 1, base; 2, control panel; 3, electric slide rod; 4, sliding part; 5, first sliding groove; 6, second sliding groove; 7, screw rod; 8, fixed nut; 9, fixed block; 10, fixed plate; 11, fixed screw; 12, printing screen; 13, electric slide; 14, connecting line; 15, telescopic part; 16, ink pressing plate; 17, scraper; 18, paper pressing part; 19, cushion layer; 20, first ventilation pipe; 21, spray head; 22, air blower; 23, telescopic rod; 24, heating air blower; 25, second ventilation pipe; 26, air exchange opening; 27, laser detector; 28, paper discharging plate. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0027] Reference Figures 1 to 4The utility model provides a kind of packing carton silk screen printing device, including base 1, cavity is set up inside base 1, and control panel 2 is installed on base 1, control panel 2 is used to control the opening and closing of each mechanism in the device, lifting mechanism is provided in cavity, lifting mechanism is installed on paper placing plate 28, lifting mechanism is used to make paper placing plate 28 realize lifting, and lifting mechanism includes two groups of telescopic link 23, two groups of telescopic link 23 are symmetrically installed on the bottom wall of cavity, and the output end of two groups of telescopic link 23 is fixedly connected with paper placing plate 28, paper board is placed on paper placing plate 28, two groups of paper pressing pieces 18 are symmetrically installed on base 1, two groups of paper pressing pieces 18 are located above paper placing plate 28, and the bottom end of two groups of paper pressing pieces 18 is equipped with cushion 19, the paper board on paper placing plate 28 is positioned by paper pressing piece 18, cushion 19 is used to avoid that paper pressing piece 18 scratches or presses the paper board, through slot is provided in the top wall of cavity for the paper placing plate 28 to pass through, printing mechanism is provided on the top end of base 1, for printing the paper board on paper placing plate 28, printing mechanism includes adjusting assembly, mounting assembly and two groups of telescopic parts 15, adjusting assembly is provided on the top end of base 1, mounting assembly and two groups of telescopic parts 15 are all provided on adjusting assembly, adjusting assembly is used to make mounting assembly and two groups of telescopic parts 15 realize translation and lifting, and mounting assembly is detachably installed with printing silk screen 12, two groups of output ends are all on two groups of telescopic parts 15, and one group of output ends on two groups of telescopic parts 15 is commonly connected with ink pad 16, and the other group of output ends on two groups of telescopic parts 15 is commonly connected with scraper 17, ink pad 16 and scraper 17 are all located above printing silk screen 12, and telescopic part 15 is prior art, and its specific structure design will not be repeated here.

[0028] Referring to Figures 1 to 4 Adjusting assembly includes support plate, support plate is fixedly installed on the top end of base 1, and slide cavity is set up in support plate, two groups of first sliding grooves 5 are penetrated in the side of support plate towards paper placing plate 28, and electric sliding rod 3 is fixedly installed on the penetration of support plate, electric sliding rod 3 is located in slide cavity, and sliding part 4 is installed on electric sliding rod 3, one side of sliding part 4 is installed with two groups of connecting plates, the end of two groups of connecting plates away from sliding part 4 respectively passes through two groups of first sliding grooves 5, and extends outward, and two groups of connecting plates opposite sides are commonly connected with electric sliding table 13, electric sliding table 13 is prior art, and its specific structure design will not be repeated here, driving part is provided inside base 1, connecting line 14 is installed on electric sliding table 13, and electric sliding table 13 is connected with the driving part inside base 1 through connecting line 14, mounting assembly is set up on the opposite side of two groups of connecting plates, and two groups of telescopic parts 15 are symmetrically installed on the bottom end of sliding block on electric sliding table 13.

[0029] Referring to Figures 1 to 3The mounting assembly comprises a mounting plate, the inside of the mounting plate is hollow, a second sliding groove 6 is formed at the top end of the mounting plate, a clamping groove is formed at the middle of one side of the mounting plate, two groups of clamping blocks are slidably connected in the clamping groove, screw rods 7 are fixedly connected to the top end of the two groups of clamping blocks, the top end of the two groups of screw rods 7 penetrates through the second sliding groove 6 and extends outward, fixed nuts 8 are threadedly connected to the two groups of screw rods 7, and the two groups of screw rods 7 are fixed on the mounting plate through the fixed nuts 8. The side of the two groups of clamping blocks facing the paper placing plate 28 is provided with a fixed block 9, and the two groups of clamping blocks are respectively connected with fixed plates 10 through the fixed block 9. Two groups of fixed screws 11 are arranged on the two groups of fixed plates 10, and the printing screen 12 is detachably mounted on the two groups of fixed plates 10 through the four groups of fixed screws 11.

[0030] Through the arrangement of the second sliding groove 6, the screw rod 7, the fixed nut 8, the clamping block and the fixed block 9, great flexibility can be provided for the installation of printing screens 12 of different sizes. Specifically, by moving the position of the screw rod 7 in the second sliding groove 6, the fixed block 9 and the fixed plate 10 can be moved horizontally. This step allows the worker to accurately position the fixed plate 10 according to the actual size of the printing screen 12. When the two groups of fixed plates 10 are adjusted to the appropriate position, the installation position of the screw rod 7 is locked by tightening the fixed nut 8, and then the printing screen 12 is fixed on the two groups of fixed plates 10 by the fixed screws 11, and finally the installation of the printing screen 12 is completed. This design not only improves the flexibility of the installation of the printing screen 12, but also greatly simplifies the installation process of the printing screen 12, thereby improving the printing efficiency of the paperboard.

[0031] Referring to Figure 1 and Figure 2 and Figures 4 to 6 The base 1 and the two groups of paper pressing pieces 18 are provided with two groups of air blowing mechanisms, and the two groups of air blowing mechanisms are located at the two ends of the paper placing plate 28. The air blowing mechanism is used for blowing air towards the top end of the paper placing plate 28. The air blowing mechanism comprises a blower 22 and a first ventilation pipe 20. The blower 22 is installed at the top end of the base 1. The side of the paper pressing piece 18 facing the paper placing plate 28 is provided with a groove. The first ventilation pipe 20 is installed on the inner wall of the groove, and one end of the first ventilation pipe 20 penetrates through the inner wall of the groove and is connected with the output end of the blower 22. A plurality of groups of nozzles 21 are uniformly arranged on the first ventilation pipe 20.

[0032] The paperboard to be printed (i.e. the unfolded carton) is placed on the paperboard placing plate 28, at this time the cushion 19 of the paper pressing member 18 can simply fix the paperboard, and then the air blower 22 is started by the control panel 2, the gas is delivered through the first air duct 20 and finally sprayed by the spray head 21, the surface of the paperboard is blown to blow away the dust or other contaminants on the surface of the paperboard, so as to avoid the dust or other contaminants on the surface of the paperboard affecting the subsequent printing, thereby ensuring the printing quality of the paperboard, and after the blowing is completed, the printing operation can be started.

[0033] When the printing operation is performed, first, the material to be printed (i.e. the ink) is poured on the printing screen 12, then the sliding member 4 is driven by the electric sliding rod 3 to move downward along the first sliding groove 5, so as to drive the printing screen 12 and the electric sliding table 13 to move downward at the same time, until

[0034] The printing screen 12 is close to the surface of the paperboard, then the ink pressing plate 16 is moved upward by the telescopic part 15 on the electric sliding table 13, and at the same time the squeegee 17 is moved downward until it is in contact with the printing screen 12 (at this time the squeegee 17 is located at the rightmost side of the printing screen 12), then the squeegee 17 is moved to the left by the electric sliding table 13, so that the squeegee 17 can scrape the ink on the printing screen 12 from right to left, and then the ink can be printed along the pattern of the printing screen 12, i.e. the printing of the paperboard is completed, when the squeegee 17 is operated, the sliding member 4 is moved upward by the electric sliding rod 3, at this time the printing screen 12 is not in contact with the paperboard, and at the same time the squeegee 17 is moved upward by the telescopic part 15, and the ink pressing plate 16 is moved downward to the position in contact with the printing screen 12 (at this time the ink pressing plate 16 is located at the leftmost side of the printing screen 12 due to the previous movement of the squeegee 17, and at the same time the excess ink will be accumulated at the left end of the printing screen 12 due to the movement of the squeegee 17), then the ink pressing plate 16 is moved to the left by the electric sliding table 13, so that the ink pressing plate 16 can scrape and press the excess ink accumulated at the left side of the printing screen 12, in order to facilitate the printing of the remaining paperboard.

[0035] Referring to Figure 4 and Figure 6The cavity is internally provided with two groups of drying mechanisms, the two groups of drying mechanisms correspond to positions of two groups of air blowing mechanisms, the drying mechanisms are used for blowing hot air to the paper board 28 after moving downward, the drying mechanisms comprise a heating fan 24, a laser detector 27 and an air exchange port 26, the heating fan 24 is fixedly installed on a bottom wall of the cavity, a plurality of second ventilation pipes 25 are installed on the heating fan 24, the laser detector 27 is installed on an inner wall of the cavity, positions of air outlet ends of the plurality of second ventilation pipes 25 correspond to a position of the laser detector 27, the air exchange port 26 is throughly arranged on the inner wall of the cavity and corresponds to a position of the heating fan 24, the air exchange port 26 is arranged to realize the air exchange function in the cavity, that is, to allow fresh air to enter and exhaust old air, so as to maintain the air circulation and drying effect in the cavity.

[0036] When printing is completed, the telescopic rod 23 is controlled to move downward by the control panel 2, so that the paper board on the paper board placing plate 28 starts to move downward, when the position of the paper board moving downward exceeds the laser detector 27, the heating fan 24 starts to start, at this time, hot air will be blown out from the second ventilation pipe 25, and the surface of the paper board is dried by blowing hot air, and the nozzle 21 above the heating fan 24 also blows air at this time (the air blown by the nozzle 21 is cold air), which is used to isolate the hot air in the cavity from rising, so as to accelerate the drying efficiency in the cavity.

[0037] In the utility model, the paper board (that is, the unfolded paper box) to be printed is placed on the paper board placing plate 28, at this time, the cushion layer 19 of the paper pressing piece 18 can simply fix the paper board, one end of the paper board placing plate 28 and the telescopic rod 23 is fixedly connected, the telescopic rod 23 is arranged in the base 1, the paper pressing piece 18 and the base 1 are fixedly connected, then the air blower 22 is started by the control panel 2, gas is conveyed through the first ventilation pipe 20 and is finally sprayed out by the nozzle 21, the surface of the paper board is swept, dust or other pollutants on the surface are swept away, so that the dust or other pollutants on the surface of the paper board do not affect subsequent printing, thereby guaranteeing the printing quality of the paper board, after sweeping is completed, printing operation can be started.

[0038] When printing, first pour the material to be printed (i.e. ink) on the printing screen 12, then the sliding piece 4 is driven by the electric slide rod 3 to move down along the first slide groove 5, thus driving the printing screen 12 and the electric slide platform 13 to move down at the same time until the printing screen 12 is close to the surface of the paperboard, then the ink pressing plate 16 is moved up by the telescopic part 15 on the electric slide platform 13, and at the same time the squeegee 17 is moved down until it is in contact with the printing screen 12 (at this time the squeegee 17 is located at the rightmost side of the printing screen 12), then the squeegee 17 is controlled to move to the left by the electric slide platform 13, so that the squeegee 17 can sweep the ink on the printing screen 12 from right to left, and then the ink can be printed along the pattern of the printing screen 12, i.e. the printing of the paperboard is completed, when the squeegee 17 finishes running, the sliding piece 4 is controlled to move up by the electric slide rod 3, at this time the printing screen 12 is not in contact with the paperboard, at the same time the squeegee 17 is moved up by the telescopic part 15, and the ink pressing plate 16 is moved down to the position in contact with the printing screen 12 (at this time the ink pressing plate 16 is located at the leftmost side of the printing screen 12 due to the previous movement of the squeegee 17, and at the same time the excess ink will be accumulated at the left end of the printing screen 12 due to the movement of the squeegee 17), then the ink pressing plate 16 is controlled to move to the left by the electric slide platform 13, so that the ink pressing plate 16 can scrape and press the excess ink accumulated at the left side of the printing screen 12 to be flat, in order to facilitate the printing of the remaining paperboard.

[0039] When the printing is completed, the telescopic rod 23 is controlled by the control panel 2 to control the paperboard placing plate 28 to move down, so that the paperboard on the paperboard placing plate 28 starts to move down, when the position of the paperboard moving down exceeds the laser detector 27, the heating fan 24 starts to work, at this time hot air will be blown out from the second air duct 25, and the hot air will dry the ink just printed on the surface of the paperboard, at the same time the nozzle 21 above the heating fan 24 will also blow cold air, which can isolate the hot air in the cavity from rising, thus accelerating the drying efficiency inside.

[0040] Because the density of hot air is smaller than that of cold air, it will naturally rise upward, when cold air is blown above the outlet of hot air, the density of cold air is larger, and it will sink under the action of gravity, when the cold and hot air streams meet, complex interaction will occur, according to the principle of fluid mechanics, the cold air will generate downward pressure on the hot air, which will hinder the upward trend of the hot air.

[0041] Through the setting of the second sliding groove 6, the screw rod 7, the fixed nut 8, the clamping block and the fixed block 9, great flexibility can be provided for the installation of printing screens 12 of different sizes, specifically, by moving the position of the screw rod 7 in the second sliding groove 6, the fixed block 9 and the fixed plate 10 can be correspondingly horizontally moved, this step allows the staff to accurately position the position of the fixed plate 10 according to the actual size of the printing screen 12, when the two groups of fixed plates 10 are adjusted to the appropriate position, the installation position of the screw rod 7 is locked by tightening the fixed nut 8, and then the printing screen 12 is fixed on the two groups of fixed plates 10 by the fixed screw 11, finally the installation of the printing screen 12 is completed, this design not only improves the flexibility of the installation of the printing screen 12, but also greatly simplifies the installation process of the printing screen 12, thereby improving the printing efficiency of the paperboard.

[0042] The above merely describes a preferred embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A packaging carton screen printing device, comprising a base (1), a cavity is formed in the inside of the base (1), and a control panel (2) is installed on the base (1), characterized in that, Also includes: Lifting mechanism, the lifting mechanism is arranged inside the cavity, and the lifting mechanism is installed on the paper board (28), the lifting mechanism is used for making the paper board (28) realize lifting, the paper board (28) is placed on the paper board, the base (1) is symmetrically installed with two groups of paper pressing parts (18), two groups of the paper pressing parts (18) are located above the paper board (28), and the bottom ends of the two groups of paper pressing parts (18) are installed with the cushion layer (19), the top wall of the cavity is provided with a through slot for the paper board (28) to pass through; Printing mechanism, the printing mechanism is arranged at the top end of the base (1), for printing the paper board on the paper board (28); Two groups of blowing mechanism, two groups of the blowing mechanism are arranged on the base (1) and the two groups of paper pressing parts (18), and the two groups of blowing mechanism are respectively located at both ends of the paper board (28), the blowing mechanism includes a blower (22) and a first ventilation pipe (20), the blower (22) is installed at the top end of the base (1), the side of the paper pressing part (18) towards the paper board (28) is provided with a groove, the first ventilation pipe (20) is installed on the inner wall of the groove, and one end of the first ventilation pipe (20) penetrates the inner wall of the groove and is connected with the output end of the blower (22), a plurality of nozzles (21) are uniformly installed on the first ventilation pipe (20); Two groups of drying mechanism, two groups of the drying mechanism are arranged inside the cavity, and the two groups of drying mechanism correspond to the two groups of blowing mechanism, the drying mechanism is used for blowing hot air to the paper board (28) after moving down.

2. A carton screen printing apparatus as claimed in claim 1, wherein, The drying mechanism includes a heating fan (24), a laser detector (27) and an air exchange port (26), the heating fan (24) is fixedly installed on the bottom wall of the cavity, and a plurality of second ventilation pipes (25) are installed on the heating fan (24), the laser detector (27) is installed on the inner wall of the cavity, the positions of the air outlet ends of the plurality of second ventilation pipes (25) correspond to the position of the laser detector (27), and the air exchange port (26) is arranged through the inner wall of the cavity, and the position of the air exchange port (26) corresponds to the position of the heating fan (24).

3. A carton screen printing apparatus as claimed in claim 1, wherein The lifting mechanism includes two groups of telescopic rods (23), two groups of the telescopic rods (23) are symmetrically installed on the bottom wall of the cavity, and the output ends of the two groups of telescopic rods (23) are fixedly connected with the paper board (28).

4. A carton screen printing apparatus as claimed in claim 1, wherein The printing mechanism includes an adjusting assembly, an installation assembly and two groups of telescopic parts (15), the adjusting assembly is arranged at the top end of the base (1), the installation assembly and the two groups of telescopic parts (15) are arranged on the adjusting assembly, the adjusting assembly is used for making the installation assembly and the two groups of telescopic parts (15) realize translation and lifting, the installation assembly is detachably installed with a printing screen (12), two groups of the telescopic parts (15) have two groups of output ends, one group of output ends of the two groups of telescopic parts (15) are connected with an ink pressing plate (16), and the other group of output ends of the two groups of telescopic parts (15) are connected with a scraper (17), the ink pressing plate (16) and the scraper (17) are located above the printing screen (12).

5. A carton screen printing apparatus as claimed in claim 4, wherein, The adjusting assembly includes a support plate, the support plate is fixedly installed at the top end of the base (1), and a sliding cavity is formed in the support plate. Two groups of first sliding grooves (5) are formed in the side of the support plate facing the paper placing plate (28), and an electric sliding rod (3) is fixedly installed through the support plate. The electric sliding rod (3) is located in the sliding cavity, and a sliding piece (4) is installed on the electric sliding rod (3). Two groups of connecting plates are installed on one side of the sliding piece (4). The two groups of connecting plates extend outward from the ends away from the sliding piece (4) and pass through the two groups of first sliding grooves (5), respectively. The two groups of connecting plates are connected with an electric sliding table (13) on the opposite side. The base (1) is provided with a driving portion inside. The electric sliding table (13) is provided with a connecting line (14), and the electric sliding table (13) is connected with the driving portion inside the base (1) through the connecting line (14). The mounting assembly is arranged on the opposite side of the two groups of connecting plates. Two groups of telescopic portions (15) are symmetrically installed at the bottom end of the sliding block on the electric sliding table (13).

6. A carton screen printing apparatus as claimed in claim 5, wherein, The mounting assembly includes a mounting plate, the mounting plate is hollow inside, and a second sliding groove (6) is formed at the top end of the mounting plate. A clamping groove is formed through the side of the mounting plate at the middle position. Two groups of clamping blocks are slidably connected in the clamping groove. Two groups of clamping blocks are fixedly connected with screw rods (7) at the top end. The two groups of screw rods (7) pass through the second sliding groove (6) and extend outward at the top end. Two groups of screw rods (7) are threadedly connected with fixed nuts (8) thereon, and the two groups of screw rods (7) are fixed on the mounting plate through the fixed nuts (8). Two groups of clamping blocks are provided with fixed blocks (9) on the side facing the paper placing plate (28), and the two groups of clamping blocks are respectively connected with fixed plates (10) through the fixed blocks (9). Two groups of fixed plates (10) are provided with two groups of fixed screws (11) thereon. The printing screen (12) is detachably installed on the two groups of fixed plates (10) through the four groups of fixed screws (11).

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