Plastic printing machine with printing roller convenient to replace

Abstract

The plastic printing machine comprises a base, a bottom frame is arranged at the lower end of the base, movable self-locking rolling wheels are symmetrically arranged on the two sides of the lower end of the bottom frame, an electric heater is arranged on the inner side of the middle of the upper end of the base, and a printing box body is arranged in the middle of the upper end of the base; and meanwhile, guide rollers are symmetrically arranged at the positions, located on the two sides of the printing box body, of the upper end of the base, and a printing assembly is arranged in the middle of the interior of the printing box body. According to the plastic printing machine convenient to replace the printing roller, by rotating a positioning nut, the positioning nut is separated from a mounting frame, then a positioning seat is separated from the mounting frame, the ink transfer roller, the printing plate roller and the printing roller body are integrally taken out from the interior of the printing box body, and then a mounting bolt is rotated; and the clamping seats and the positioning bearings are separated from the positioning side plates and the side edges of the printing plate roller and the printing roller body, so that the printing roller body is disassembled, operation is easy, and the use practicability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to the printing of plastic packaging bags, and particularly to a plastic printing machine facilitating the replacement of a printing roller. Background Art

[0002] Printing is a technology that transfers the original manuscript such as text, pictures, photos, anti-counterfeiting, etc. to the surfaces of materials such as paper, textiles, plastics, leather, PVC, PC, etc. through processes such as plate making, ink application, and pressing, and batch replicates the content of the original manuscript. Printing is a process of transferring the approved printing plate to the printing substrate through a printing machine and special ink.

[0003] After retrieval, it is found that a typical printing machine in the prior art is, for example, the one with the publication number CN221137210U, a plastic packaging bag printing device, including: a conveying table; the first mounting seat and the second mounting seat are erected on the conveying table, and a printing mechanism is provided on the first mounting seat; a drying mechanism is provided on the second mounting seat. The drying mechanism includes a first motor, the first motor is fixedly connected to a lead screw, and two first connecting plates are symmetrically screwed on both sides of the lead screw. Both of the two first connecting plates are hinged to a connecting rod through a connecting seat and an installation plate. A rotating motor is fixedly installed on the installation plate, the rotating motor is fixedly connected to a turntable, and a plurality of ultraviolet curing lamps are fixedly installed on the turntable; by setting the rotating motor, the ultraviolet curing lamps can be driven to rotate so that the light irradiates the plastic bag more evenly and the curing effect is better; by setting the first motor, the vertical adjustment of the ultraviolet curing lamps can be realized, so as to achieve the effect of adjusting the drying temperature by adjusting the distance between the ultraviolet curing lamps and the plastic packaging bag.

[0004] To sum up, during the use of the printing roller provided in the existing printing machine, impurities are likely to remain on its surface to form an enamel layer, reducing the surface area of the printing roller. Then, the printing roller needs to be removed for cleaning. However, the disassembly and assembly operations of the printing roller in the existing printing machine are complex and cumbersome, reducing the practicality of use. For the above problems, the existing equipment needs to be improved. Summary of the Invention

[0005] The purpose of the present invention is to provide a plastic printing machine facilitating the replacement of a printing roller, so as to solve the problem that the disassembly and assembly operations of the printing roller in the existing printing machine are complex and cumbersome, reducing the practicality of use as mentioned in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A plastic printing machine facilitating the replacement of a printing roller, including a base,

[0007] A chassis is provided at the lower end of the base, and movable self-locking rollers are symmetrically arranged on both sides of the lower end of the chassis. At the same time, an electric heater is provided inside the middle of the upper end of the base. A printing box body is provided in the middle of the upper end of the base, and material feeding ports are opened in the middle of the lower ends of both sides of the printing box body. At the same time, guide rollers are symmetrically arranged on both sides of the upper end of the base and located on both sides of the printing box body. A printing assembly is provided in the middle of the printing box body, and the printing assembly includes an ink transfer roller, a printing plate roller, and a printing roller body. At the same time, connecting shafts are provided in the middle of both sides of the ink transfer roller. Threaded sleeves are sleeved on the outer sides of the two connecting shafts, and the outer ends of the two connecting shafts are U-shaped engaged with the openings at one ends of the corresponding positioning seats. At the same time, the threaded sleeves are threadedly connected to the outer ends of the positioning seats. The other end of the positioning seat is detachably connected to the corresponding mounting bracket, and the mounting bracket is of a T-shaped structure. At the same time, a positioning nut is threadedly connected to the upper end of the mounting bracket at the top of the positioning seat. The lower ends of the two positioning seats are provided with positioning side plates, and the printing plate roller and the printing roller body are arranged between the two positioning side plates. At the same time, the two positioning side plates are connected to a clamping seat through mounting bolts. Positioning bearings are symmetrically arranged on one side of the clamping seat, and the two positioning bearings penetrate through the positioning side plates and are connected to the sides of the printing plate roller and the printing roller body. A leveling and placing assembly is provided below the printing assembly at the upper end of the base, which is used to level and position plastic packaging bags to improve printing quality.

[0008] Preferably, a top cover is provided at the top of the printing box body, and a plug-in board is provided at the lower end of the top cover. At the same time, the plug-in board is snap-fitted with the groove opened at the top of the printing box body. A plurality of positioning knobs are equidistantly arranged on the outer side of the upper end of the printing box body, and the positioning knobs penetrate through the outer side of the printing box body, the plug-in board, and are connected to the inner side of the printing box body.

[0009] Preferably, a placing groove is opened in the middle of the upper end of the top cover, and spring buttons are symmetrically arranged on the four sides of the bottom end inside the placing groove. At the same time, the top of each spring button is attached to the metal sheet provided at the bottom of the lower end of the ink storage box through a positioning magnet. A drain pipe is provided in the middle of the lower end of the ink storage box, and the drain pipe penetrates through the top cover and is connected to a metering drain valve. At the same time, the bottom of the metering drain valve is connected to the connecting pipe provided at the upper end of the ink transfer roller.

[0010] Preferably, pressing rollers are symmetrically arranged below the front side and the rear side of the printing assembly inside the printing box body. The two pressing rollers are connected to the printing box body through positioning brackets on both sides. At the same time, the bottom of the pressing roller is at the same horizontal plane as the bottom of the guide roller.

[0011] Preferably, the leveling and placing assembly includes a placing plate, and electric linear guides are symmetrically arranged on both sides below the printing assembly at the upper end of the placing plate. At the same time, the top of the electric linear guide arranged on one side is connected to the lower end of the corresponding moving seat. An eccentric pressing wheel is provided at the upper end of the moving seat, and the eccentric pressing wheel is connected to the corresponding limiting side plate through a mounting shaft. At the same time, the mounting shaft arranged on one side penetrates through the limiting side plate and is connected to a micro motor.

[0012] Preferably, a plurality of heat conduction holes are formed in the middle of the placement plate, and the positions of the heat conduction holes are correspondingly arranged with the positions of the electric heaters. At the same time, a heat collection cushion block is arranged above the heat conduction holes at the upper end of the placement plate. The heat collection cushion block is of a concave structure, and the outer side of the heat collection cushion block is made of a metal material, and the inner side of the heat collection cushion block is made of a graphene material.

[0013] Preferably, the length dimension of the placement plate is the same as the length dimension of the base, and both sides of the placement plate are located below the inner sides of the two guide rollers.

[0014] Preferably, both sides of the placement plate are connected to the guide slide rails arranged on the inner sides of the side edges of the printing box body. At the same time, a plurality of support vertical rods are symmetrically arranged at the bottom of the lower end of the placement plate. The support vertical rods penetrate through the base and are connected to the pushing seat. The pushing seat is located inside the chassis, and the lower end of the pushing seat is connected to the bottom end inside the chassis through a plurality of electric hydraulic cylinders.

[0015] Preferably, the placement plate and the base form a lifting structure through the support vertical rods, the pushing seat and the electric hydraulic cylinders.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The plastic printing machine that is convenient for replacing the printing roller

[0017] (1) In order to solve the problem that the disassembly and assembly operations of the printing roller of the existing printing machine are complicated and cumbersome, reducing the practicability of use, in this application, by rotating the positioning nut, the positioning nut is separated from the mounting frame, and then the positioning seat is separated from the mounting frame, and the ink transfer roller, the printing plate roller and the printing roller body are taken out of the printing box body as a whole. Then, by rotating the mounting bolt, the clamping seat and the positioning bearing are separated from the positioning side plate and the sides of the printing plate roller and the printing roller body, so as to disassemble the printing roller body. The operation is simple and the practicability of use is improved;

[0018] (2) In order to solve the problem that when the existing printing machine is in use, the plastic packaging bag is not conveyed and leveled, resulting in easy position deviation and wrinkles during conveying, so that the printing position is inaccurate and the printing quality is reduced, affecting the printing processing efficiency and reducing the qualified rate of products. In this application, by arranging the guide rollers and the pressing rollers, it is convenient to convey the plastic packaging bag and guide it at the same time. Then, through the combined use of the support vertical rods, the pushing seat, the electric hydraulic cylinders and the leveling and placing assembly, it is convenient to level and position the printing part, improving the printing quality and the qualified rate of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view sectional structure diagram of the present invention;

[0020] Figure 2 It is a front view sectional structure diagram of the printing assembly of the present invention;

[0021] Figure 3 This is a front view sectional structure schematic diagram of the leveling and placing component of the present invention;

[0022] Figure 4 This is a side view structure schematic diagram of the leveling and placing component of the present invention;

[0023] Figure 5 This is a front view structure schematic diagram of the present invention;

[0024] Figure 6 This is a side view structure schematic diagram of the present invention.

[0025] In the figure: 1, base; 101, electric heater; 102, guide roller; 2, chassis; 3, moving self-locking roller; 4, printing box; 401, guide slide rail; 5, top cover; 6, plug-in board; 7, positioning knob; 8, ink storage cartridge; 9, spring button; 10, metering ink discharge valve; 11, printing component; 1101, ink transfer roller; 1102, connecting pipe; 1103, connecting shaft; 1104, threaded sleeve; 1105, positioning seat; 1106, mounting bracket; 1107, positioning nut; 1108, positioning side plate; 1109, printing plate roller; 1110, printing roller body; 1111, engaging seat; 1112, positioning bearing; 12, leveling and placing component; 1201, placing plate; 12011, heat conduction hole; 12012, heat collecting cushion block; 1202, electric linear guide rail; 1203, moving seat; 1204, eccentric pressing wheel; 1205, limiting side plate; 1206, micro motor; 13, supporting vertical rod; 14, pushing seat; 15, electric hydraulic cylinder; 16, pressing roller; 17, positioning frame. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0027] Please refer to Figure 1-6 , the present invention provides a technical solution: a plastic printing machine that is convenient for replacing printing rollers. According to Figure 1 , Figure 5 and Figure 6As shown, a chassis 2 is provided at the lower end of the base 1, and movable self-locking rollers 3 are symmetrically arranged on both sides of the lower end of the chassis 2. At the same time, an electric heater 101 is arranged inside the middle of the upper end of the base 1. The electric heater 101 is a prior art. By generating heat through the electric heater 101, the temperature during printing is increased, so that the ink can quickly solidify after being printed on the plastic packaging bag, improving the printing quality. A printing box body 4 is arranged in the middle of the upper end of the base 1, and material feeding ports are opened in the middle of the lower ends of both sides of the printing box body 4. At the same time, guide rollers 102 are symmetrically arranged on both sides of the upper end of the base 1 and located on both sides of the printing box body 4. A top cover 5 is arranged on the top of the printing box body 4, and a plug-in board 6 is arranged at the lower end of the top cover 5. At the same time, the plug-in board 6 is snap-connected with the groove opened on the top of the printing box body 4. A plurality of positioning knobs 7 are equidistantly arranged on the outer side of the upper end of the printing box body 4, and the positioning knobs 7 penetrate through the outer side of the printing box body 4, the plug-in board 6 and are connected with the inner side of the printing box body 4. Through the positioning knobs 7, it is convenient to connect and fix the top cover 5 with the printing box body 4. A placing groove is opened in the middle of the upper end of the top cover 5, and spring buttons 9 are symmetrically arranged on the four sides of the bottom end inside the placing groove. At the same time, the top of each spring button 9 is attached to the metal sheet arranged at the bottom of the lower end of the ink storage box 8 through a positioning magnet. The spring button 9 is a prior art. By pressing the ink storage box 8, the ink storage box 8 squeezes the spring button 9, and under the action of the spring button 9, the ink storage box 8 is ejected from the inside of the placing groove, facilitating the replacement of the ink storage box 8. A drain pipe is arranged in the middle of the lower end of the ink storage box 8, and the drain pipe penetrates through the top cover 5 and is connected with a metering drain valve 10. At the same time, the bottom of the metering drain valve 10 is connected with a connecting pipe 1102 arranged at the upper end of the ink transfer roller 1101. Through the metering drain valve 10, the ink inside the ink storage box 8 enters the ink transfer roller 1101 through the drain pipe and the connecting pipe 1102.

[0028] Further explanation, pressing rollers 16 are symmetrically arranged below the front side and the rear side of the printing assembly 11 inside the printing box body 4, and both sides of the two pressing rollers 16 are connected with the printing box body 4 through positioning frames 17. At the same time, the bottom of the pressing roller 16 and the bottom of the guide roller 102 are at the same horizontal plane. Through the pressing roller 16, the position of the plastic packaging bag is not easily offset during transportation inside the printing box body 4, improving the accuracy of the transportation position.

[0029] According to Figure 1 and Figure 2As shown in the figure, a printing assembly 11 is provided in the middle of the printing box body 4. The printing assembly 11 includes an ink transfer roller 1101, a printing plate roller 1109 and a printing roller body 1110. At the same time, connecting shafts 1103 are provided in the middle on both sides of the ink transfer roller 1101. Threaded sleeves 1104 are sleeved on the outer sides of the two connecting shafts 1103. The outer ends of the two connecting shafts 1103 are engaged with the U-shaped openings provided at one end of the corresponding positioning seats 1105. At the same time, the threaded sleeves 1104 are threadedly connected to the outer ends of the positioning seats 1105. The other end of the positioning seat 1105 is detachably connected to the corresponding mounting bracket 1106. The mounting bracket 1106 is of a T-shaped structure. At the same time, a positioning nut 1107 is threadedly connected to the upper end of the mounting bracket 1106 at the top of the positioning seat 1105. Positioning side plates 1108 are provided at the lower ends of the two positioning seats 1105. The printing plate roller 1109 and the printing roller body 1110 are provided between the two positioning side plates 1108. At the same time, the two positioning side plates 1108 are connected with a clamping seat 1111 through mounting bolts. Positioning bearings 1112 are symmetrically provided on one side of the clamping seat 1111. The two positioning bearings 1112 penetrate through the positioning side plates 1108 and are connected to the sides of the printing plate roller 1109 and the printing roller body 1110.

[0030] During use, by engaging the connecting shafts 1103 provided on both sides of the ink transfer roller 1101 with the corresponding positioning seats 1105 on one side, and then rotating the threaded sleeves 1104 so that the threaded sleeves 1104 are threadedly connected to the outer sides of the positioning seats 1105, the installation of the ink transfer roller 1101 is completed. Then, the printing plate roller 1109 and the printing roller body 1110 are placed between the two positioning side plates 1108, so that the outer side of the upper end of the printing plate roller 1109 is attached to the outer side of the ink transfer roller 1101, and the outer side of the lower end of the printing plate roller 1109 is attached to the outer side of the printing roller body 1110. Then, the clamping seat 1111 and the positioning bearings 1112 are passed through the positioning side plates 1108, so that the positioning bearings 1112 are engaged with the corresponding ends of the printing plate roller 1109 and the printing roller body 1110, and the provided clamping seat 1111 is engaged with the outer side of the positioning side plate 1108. Then, the mounting bolts are rotated to connect and fix the clamping seat 1111 to the positioning side plate 1108, thus completing the installation of the printing plate roller 1109 and the printing roller body 1110. Then, the positioning seat 1105 is engaged with the mounting bracket 1106, and the positioning nut 1107 is rotated so that the positioning seat 1105 is limited and fixed under the action of the positioning nut 1107, so that the printing assembly 11 is installed inside the printing box body 4. On the contrary, the printing assembly 11 is disassembled, and the operation is simple, improving the practicality of use.

[0031] According to Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown in the figure, a leveling and placing assembly 12 is provided below the upper end of the base 1 and below the printing assembly 11, which is used to level and position the plastic packaging bag to improve the printing quality.

[0032] Specifically, the leveling and placing assembly 12 includes a placing plate 1201. Electric linear guides 1202 are symmetrically arranged on both sides below the printing assembly 11 at the upper end of the placing plate 1201. At the same time, the top of the electric linear guide 1202 arranged on one side is connected to the lower end of the corresponding moving seat 1203. An eccentric pressing wheel 1204 is arranged at the upper end of the moving seat 1203, and the eccentric pressing wheel 1204 is connected to the corresponding limiting side plate 1205 through a mounting shaft. At the same time, the mounting shaft arranged on one side penetrates through the limiting side plate 1205 and is connected to a micro motor 1206. The micro motor 1206 drives the mounting shaft and the eccentric pressing wheel 1204 to rotate, clamping and positioning the side of the printing position of the plastic packaging bag. Then, the electric linear guide 1202 drives the moving seat 1203 to move outward to level the printing position of the plastic packaging bag, improving the printing quality. Both sides of the placing plate 1201 are connected to the guiding slide rails 401 arranged on the inner sides of the side walls of the printing box body 4. Through the guiding slide rails 401, the stability of the lifting and moving of the placing plate 1201 inside the printing box body 4 is improved. A plurality of supporting vertical rods 13 are symmetrically arranged at the bottom of the lower end of the placing plate 1201. At the same time, the supporting vertical rods 13 penetrate through the base 1 and are connected to a pushing seat 14. The pushing seat 14 is located inside the chassis 2, and the lower end of the pushing seat 14 is connected to the bottom end inside the chassis 2 through a plurality of electric hydraulic cylinders 15. The placing plate 1201, the supporting vertical rods 13, the pushing seat 14 and the electric hydraulic cylinders 15 form a lifting structure with the base 1. The electric hydraulic cylinders 15 push the pushing seat 14 and the supporting vertical rods 13 to move upward synchronously, so that the placing plate 1201 also moves synchronously, making the upper end of the placing plate 1201 fit with the bottom of the guiding roller 102 and the pressing roller 16, guiding and limiting the plastic packaging bag conveyed on the placing plate 1201, improving the practicality of use.

[0033] Furthermore, the length dimension of the placing plate 1201 is the same as the length dimension of the base 1, and both sides of the placing plate 1201 are located below the inner sides of the two guiding rollers 102. A plurality of heat-conducting holes 12011 are formed in the middle of the placing plate 1201, and the positions of the heat-conducting holes 12011 are correspondingly arranged with the position of the electric heater 101. At the same time, a heat-collecting cushion block 12012 is arranged above the heat-conducting holes 12011 at the upper end of the placing plate 1201. The heat-collecting cushion block 12012 is of a concave structure, and the outer side of the heat-collecting cushion block 12012 is made of a metal material, while the inner side of the heat-collecting cushion block 12012 is made of a graphene material. The heat generated by the electric heater 101 is adsorbed through the heat-collecting cushion block 12012, making the heat-collecting cushion block 12012 have a certain temperature, enabling the printed ink to solidify quickly, making it difficult for the ink to be scratched during conveying, and improving the printing quality.

[0034] In use, one end of the plastic packaging bag is passed smoothly through the upper end of one side of the placement plate 1201 and between the corresponding guide rollers 102, and then through the material feeding port opened on one side of the printing box body 4, and then through the plastic packaging bag under the lower pressing roller 16 on one side, under the eccentric pressing wheel 1204 on one side, under the printing assembly 11, under the eccentric pressing wheel 1204 on the other side, under the lower pressing roller 16 provided on the other side, and through the material feeding port opened on the other side of the printing box body 4 and located between the upper end of the other side of the placement plate 1201 and the corresponding guide roller 102. Then, the electric hydraulic cylinder 15 is started to push the pushing seat 14, the support vertical rod 13 and the placement plate 1201, so that the placement plate 1201 moves smoothly inside the printing box body 4 under the action of the guiding slide rail 401 until the upper end of the placement plate 1201 and the bottom of the guide roller 102 and the lower pressing roller 16 limit the conveying of the plastic packaging bag. Then, when the printing position of the plastic packaging bag is located at the upper end of the heat collecting cushion block 12012, the electric heater 101 and the micro motor 1206 are started. The micro motor 1206 drives the mounting shaft and the eccentric pressing wheel 1204 to rotate to clamp and position the side of the printing position of the plastic packaging bag. Then, the electric linear guide rail 1202 drives the moving seat 1203 to move outward to level the printing position of the plastic packaging bag, and at the same time, the upper surface of the plastic packaging bag is attached to the lower end of the printing roller body 1110. Then, the plastic packaging bag is moved, so that the printing roller body 1110 rotates under the action of the plastic packaging bag, and the ink is printed on the plastic packaging bag to complete the printing. Under the action of the electric heater 101 and the heat collecting cushion block 12012, the ink is quickly cured, thereby improving the printing quality.

[0035] The orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only a simplified description for facilitating the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the protection scope of the present invention.

[0036] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A plastic printing machine facilitating the replacement of a printing roller, comprising a base (1), characterized in that: A chassis (2) is arranged at the lower end of the base (1), and movable self-locking rollers (3) are symmetrically arranged on both sides of the lower end of the chassis (2). Meanwhile, an electric heater (101) is arranged inside the middle of the upper end of the base (1). A printing box body (4) is arranged in the middle of the upper end of the base (1). Feeding ports are formed in the middle of the lower ends of both sides of the printing box body (4). Meanwhile, guide rollers (102) are symmetrically arranged on both sides of the upper end of the base (1) and located on both sides of the printing box body (4). A printing assembly (11) is arranged in the middle of the interior of the printing box body (4). The printing assembly (11) includes an ink transfer roller (1101), a printing plate roller (1109), and a printing roller body (1110). Meanwhile, connecting shafts (1103) are arranged in the middle of both sides of the ink transfer roller (1101). Threaded sleeves (1104) are sleeved on the outer sides of the two connecting shafts (1103). The outer ends of the two connecting shafts (1103) are U-shaped clamped with the openings formed at one ends of the corresponding positioning seats (1105). Meanwhile, the threaded sleeves (1104) are threadedly connected with the outer ends of the positioning seats (1105). The other ends of the positioning seats (1105) are detachably connected with the corresponding mounting frames (1106). The mounting frames (1106) are of T-shaped structures. Meanwhile, positioning nuts (1107) are threadedly connected to the tops of the positioning seats (1105) and located above the mounting frames (1106). Positioning side plates (1108) are arranged at the lower ends of the two positioning seats (1105). A printing plate roller (1109) and a printing roller body (1110) are arranged between the two positioning side plates (1108). Meanwhile, a clamping seat (1111) is connected to the two positioning side plates (1108) through mounting bolts. Positioning bearings (1112) are symmetrically arranged on one side of the clamping seat (1111). The two positioning bearings (1112) penetrate through the positioning side plates (1108) and are connected to the sides of the printing plate roller (1109) and the printing roller body (1110). A leveling and placing assembly (12) is arranged at the upper end of the base (1) and below the printing assembly (11) for leveling and positioning plastic packaging bags to improve printing quality.

2. The plastic printing machine for facilitating the replacement of a printing roller according to claim 1, wherein: A top cover (5) is arranged at the top of the printing box body (4). A plug-in board (6) is arranged at the lower end of the top cover (5). Meanwhile, the plug-in board (6) is snap-fitted with the groove formed at the top of the printing box body (4). A plurality of positioning knobs (7) are equidistantly arranged on the outer side of the upper end of the printing box body (4). The positioning knobs (7) penetrate through the outer side of the printing box body (4) and the plug-in board (6) and are connected to the inner side of the printing box body (4).

3. The plastic printing machine facilitating the replacement of a printing roller as claimed in claim 2, wherein: A placing groove is formed in the middle of the upper end of the top cover (5). Spring buttons (9) are symmetrically arranged on the four sides of the bottom end inside the placing groove. Meanwhile, the top of each spring button (9) is attached to the metal sheet arranged at the bottom of the lower end of the ink storage box (8) through a positioning magnet. A drain pipe is arranged in the middle of the lower end of the ink storage box (8). The drain pipe penetrates through the top cover (5) and is connected to a metering drain valve (10). Meanwhile, the bottom of the metering drain valve (10) is connected to a connecting pipe (1102) arranged at the upper end of the ink transfer roller (1101).

4. The plastic printing machine facilitating the replacement of a printing roller according to claim 1, wherein: Below the front and rear sides of the printing assembly (11) inside the printing box body (4), pressing rollers (16) are symmetrically arranged, and both sides of the two pressing rollers (16) are connected to the printing box body (4) through positioning frames (17). At the same time, the bottoms of the pressing rollers (16) and the bottom of the guiding roller (102) are at the same horizontal plane.

5. The plastic printing machine facilitating the replacement of a printing roller according to claim 1, wherein: The leveling and placing assembly (12) includes a placing plate (1201). Electric linear guides (1202) are symmetrically arranged on both sides below the printing assembly (11) at the upper end of the placing plate (1201). At the same time, the top of the electric linear guide (1202) arranged on one side is connected to the lower end of the corresponding moving seat (1203). An eccentric pressing wheel (1204) is arranged at the upper end of the moving seat (1203), and the eccentric pressing wheel (1204) is connected to the corresponding limiting side plate (1205) through a mounting shaft. At the same time, the mounting shaft arranged on one side penetrates through the limiting side plate (1205) and is connected to a micro motor (1206).

6. The plastic printing machine facilitating the replacement of a printing roller as claimed in claim 5, wherein: A plurality of heat conduction holes (12011) are formed in the middle of the placing plate (1201), and the positions of the heat conduction holes (12011) are correspondingly arranged with the positions of the electric heaters (101). At the same time, a heat collecting cushion block (12012) is arranged above the heat conduction holes (12011) at the upper end of the placing plate (1201). The heat collecting cushion block (12012) is of a concave structure, the outer side of the heat collecting cushion block (12012) is made of a metal material, and the inner side of the heat collecting cushion block (12012) is made of a graphene material.

7. The plastic printing machine facilitating the replacement of a printing roller as claimed in claim 5, wherein: The length dimension of the placing plate (1201) is the same as the length dimension of the base (1), and both sides of the placing plate (1201) are below the inner sides of the two guiding rollers (102).

8. The plastic printing machine facilitating the replacement of a printing roller as claimed in claim 5, wherein: Both sides of the placing plate (1201) are connected to the guiding slide rails (401) arranged on the inner sides of the side edges inside the printing box body (4). At the same time, a plurality of supporting vertical rods (13) are symmetrically arranged at the bottom of the lower end of the placing plate (1201). The supporting vertical rods (13) penetrate through the base (1) and are connected to the pushing seat (14). The pushing seat (14) is located inside the chassis (2), and the lower end of the pushing seat (14) is connected to the bottom end inside the chassis (2) through a plurality of electric hydraulic cylinders (15).

9. The plastic printing machine for facilitating the replacement of a printing roller according to claim 8, wherein: The placing plate (1201) forms a lifting structure with the base (1) through the supporting vertical rods (13), the pushing seat (14), and the electric hydraulic cylinders (15).

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