A printing machine for biodegradable food plastic packaging bags

Abstract

The present invention relates to the technical field of printing machines, specifically a printing machine for degradable food plastic packaging bags, including a machine frame and a bracket, the number of the brackets is two groups, and they are fixedly installed at the left and right positions of the outer surface of the lower end of the machine frame, the machine frame is designed in a round-shaped structure, and a limit assembly is arranged at the lower end position inside the machine frame, a printing roller is installed inside the limit assembly, and the middle area of ​​the upper and lower outer surfaces of the printing roller is a printing area, an oil outlet cylinder is movably installed inside the machine frame near the upper end position of the printing roller, and a driving assembly is passed between the printing roller and the oil outlet cylinder; the limit assembly includes a V-shaped frame and a vertical rod, and the V-shaped frame is horizontally placed inside the machine frame, and the number of the vertical rods is four. The present invention can timely and evenly add ink to the surface of the printing roller, and reduce the reduction of printing quality due to ink agglomeration, can adapt to the printing of packaging bags of different thicknesses, and reduce the situation of film damage caused by heavy pressure printing due to hollow roll film.

Description

Technical Field

[0001] The invention relates to the technical field of printing machines, in particular to a printing machine used for degradable food plastic packaging bags. Background Art

[0002] Plastic packaging bags are needed in the process of food packaging. In order to meet people's needs, degradable food plastic packaging bags are becoming more and more popular. Before packaging food, plastic packaging bags need to be printed with patterns or texts on the surface. When using a plastic packaging bag printing machine to print plastic packaging bags, the printing roller is generally in contact with the ink inside the ink box, and the ink is applied to the outer wall of the printing roller, and then the printing roller rotates to print the pattern or text on the outer wall of the packaging bag. However, the printing roller directly contacts the ink to absorb the ink, resulting in the uncontrollable and uneven amount of ink attached to the surface of the printing roller, which causes the printed pattern or text to be blurred, affecting the quality of packaging bag printing.

[0003] The existing patent (publication number: CN113022113A) is a printing machine for degradable food plastic packaging bags and its use method, including a workbench, a frame is fixedly installed on the top outer wall of the workbench, a guide roller is fixedly installed between the top inner walls on the left and right sides of the frame, a printing roller is fixedly installed between the bottom inner walls on the left and right sides of the frame, an ink box is fixedly installed on the top outer wall of the workbench, the bottom outer wall of the printing roller is located in the inner cavity of the ink box, and an adsorption block is movably provided in the inner cavity of the ink box. The device is expanded by an expansion spring, so that the slider moves upward with the adsorption block to contact the printing roller.

[0004] Although the printer for degradable food plastic packaging bags can ensure that the ink is evenly and appropriately applied to the outer wall of the printing roller, ensuring the quality of the printing of the packaging bags, there are still some shortcomings: during the printing process, the printer for degradable food plastic packaging bags can use the slider to evenly apply the ink on the surface of the printing roller, but the adsorption block is immersed in the ink box, and the area where the ink is adsorbed is generally located at the lower end, and the amount of ink staying on the upper end of the adsorption block is small, so the amount of ink contaminated on the surface of the printing roller is also small, which will cause the color of the printed font on the surface of the packaging bag to be lighter. In addition, the ink box and the adsorption block of the device are exposed to the air for a long time, which is very likely to cause ink agglomeration, thereby affecting the printing quality. Especially in a high temperature environment, the problem is significant;

[0005] The existing printing machines are put into use. In order to better adapt to the printing of packaging bags of different thicknesses and to make the printing roller fit better with the surface of the packaging bags, it is necessary to timely adjust the distance between the printing roller and the printing platform as needed to improve work efficiency. In addition, since the packaging bags are mostly in the form of rolled films during printing, in order to reduce the bag body from being in a hollow state without being in contact with the printing platform during the pulling and printing process, it is very easy to cause the bag body to be damaged by pressure during the printing process, affecting the printing quality of the packaging bags.

[0006] To this end, a printing machine for degradable food plastic packaging bags is proposed. Summary of the invention

[0007] The object of the present invention is to provide a printing machine for degradable food plastic packaging bags, which can add ink to the surface of the printing roller in a timely and uniform manner, reduce ink agglomeration and reduce printing quality, can adapt to the printing of packaging bags of different thicknesses, and reduce the damage of the film caused by heavy pressure printing due to the hollow roll film, so as to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a printing machine for degradable food plastic packaging bags, comprising a machine frame and a bracket, the number of the brackets is two groups, and the brackets are respectively fixedly installed at the left and right positions of the outer surface of the lower end of the machine frame, the machine frame is designed in a round-shaped structure, and a limit assembly is arranged at the lower end position inside the machine frame, a printing roller is installed inside the limit assembly, and the middle areas of the outer surfaces of the upper and lower ends of the printing roller are both printing areas, the oil outlet cylinder is movably installed inside the machine frame near the upper end position of the printing roller, and the printing roller and the oil outlet cylinder are connected by a driving assembly;

[0009] The limit assembly includes a V-shaped frame and a vertical rod, and the V-shaped frame is placed horizontally inside the machine frame. There are four vertical rods, and they are movably installed at the front and rear end positions of the left and right sides of the V-shaped frame respectively. The four vertical rods are divided into two groups, and the left and right two vertical rods form a group. A hanging rod is fixedly installed between the left and right two vertical rods. A rectangular groove is opened in the middle position of the front and rear ends of the V-shaped frame, and four groups of stop blocks are fixedly installed at equal distances from top to bottom in the rectangular groove. The outer surfaces of the upper and lower ends of the stop blocks are both designed as curved surfaces. It crosses the interior of the rectangular groove and is placed between two adjacent groups of resistance blocks, and the bottom of the vertical rod is fixedly connected to the interior of the machine frame. A resistance ball is fixedly installed on the outer surface of the other side of the resistance block. The resistance ball is made of rubber, and the distance between it and the inner wall of the rectangular groove is less than the diameter of the vertical rod. The bottom of the V-shaped frame is arranged in a curved structure, and the front and rear positions of the outer surface of the lower end of the V-shaped frame are respectively provided with a feed port and a discharge port. The outer surface of the upper end of the machine frame is respectively fixedly installed with a discharge drum and a winding drum at the diagonal positions of the lower ends of the feed port and the discharge port;

[0010] The driving assembly includes a turntable 1, a motor, a rotating shaft 1, a turntable 2 and a belt. The rotating shaft 1 is fixedly mounted on the outer surface of one side of the printing roller, and the turntable 1 is fixedly mounted at the middle position of the outer surface of the rotating shaft 1. The rotating shaft 1 penetrates the machine frame and is fixedly connected to the motor. The turntable 2 is fixedly mounted on the outer surface of one side of the oil outlet cylinder, and the turntable 1 and the turntable 2 are connected by a belt drive.

[0011] Preferably, the outer surface of the inner surface of the feed port close to the bottom of the V-shaped frame and the outer surface of the inner surface of the discharge port close to the bottom of the V-shaped frame are both arc-shaped, and three groups of rubber tubes are embedded in the arc surface of the feed port, and one side of the three groups of rubber tubes passes through the interior of the feed port.

[0012] Preferably, the oil outlet cylinder is designed as a hollow structure, and the upper and lower ends of the oil outlet cylinder are fixedly installed with oil outlet components, and the upper and lower groups of the oil outlet components are relatively distributed, and the oil outlet component comprises a pressure frame, an oil placement bag, and an oil outlet plate, the pressure frame is a trapezoidal structure installed in the oil outlet cylinder near the lower end, the oil placement bag is designed as an annular cylinder structure and is fixedly installed at the lower end of the pressure frame, and the oil outlet plate is fixedly installed at the lower end of the oil placement bag, the middle part of the oil outlet plate is designed as a bent structure, and it penetrates to the inner wall of the oil outlet cylinder and is connected to the outside, the inside of the oil outlet plate is equidistantly provided with hole grooves 1, two groups of limiting ropes are fixedly installed in the middle position of the inside of the oil outlet cylinder, and the two are fixedly installed in the middle position of the oil outlet cylinder in a cross-winding manner, a sleeve is fixedly installed in the middle position of the limiting rope, and a straight rod is connected to the inside of the sleeve, and gravity balls are fixedly installed at the upper and lower ends of the straight rod, and the two groups of gravity balls are against the pressure frames in the upper and lower groups of oil outlet components.

[0013] Preferably, arc grooves are provided at the lower left and right ends of the inner surface of the oil outlet cylinder, and rollers are rotatably connected to the left and right ends of the lower outer surface of the pressure frame, and two sets of rollers are respectively rollingly connected to the inside of the arc grooves.

[0014] Preferably, a closing plate is movably mounted on the outer surface of the lower end of the oil outlet plate, and the middle position of the closing plate is also bent, the length of the closing plate is smaller than that of the oil outlet plate, and the left and right sides of the upper outer surface of the closing plate are movably connected with two rollers, the left and right sides of the lower outer surface of the oil outlet plate are provided with transverse grooves, and its two groups of two rollers are respectively slidably connected inside the transverse grooves, two hole grooves are equidistantly opened inside the closing plate, and the two hole grooves are offset from the one hole groove up and down, and a push rod is fixedly mounted on the upper end of the closing plate, and the upper end of the push rod passes through the fixed connection of the oil outlet plate, the oil bag and the pressure frame.

[0015] Preferably, the left and right sides of the inner surface of the V-shaped frame are provided with limiting grooves near the upper end, and a hinge ball is hinged in the limiting groove, and a limiting plate is fixedly installed at one end of the hinge ball, and a roller brush is fixedly installed on the outer surface of one side of the limiting plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Through the coordinated use of the limit frame, V-shaped frame, vertical pole and hanging rod, the distance between the bottom of the printing roller and the inside of the V-shaped frame needs to be adjusted according to the thickness of the packaging bag to adapt to the printing of packaging bags of different thicknesses. Then, three sets of rubber cylinders are set at the feeding port at the bottom of the V-shaped frame. The friction between the plastic film and the rubber material generates static electricity, which makes the roll film stick to the inner surface of the V-shaped frame during the twitching process, reducing the damage of the film caused by heavy pressure printing due to the hollow roll film;

[0018] 2. By setting up an oil outlet cylinder, two sets of oil outlet components and a gravity ball, the oil outlet component can be squeezed by the gravity ball to keep sufficient ink in the printing area and improve the clarity of the printed fonts on the surface of the packaging bag. Then, the oil outlet plate and the closing plate are used together to automatically open and close the ink adding channel to reduce the waste of ink adding. At the same time, the contact time between the ink inside the oil bag and the external air is reduced, reducing the situation where the ink clumps and affects the use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a left side cross-sectional view of the present invention;

[0021] Figure 3 It is a left side cross-sectional view of the V-shaped frame of the present invention;

[0022] Figure 4 For the present invention Figure 3 A magnified image of A;

[0023] Figure 5 It is a left side cross-sectional view of the combination of the oil outlet cylinder and the internal oil outlet assembly of the present invention;

[0024] Figure 6 It is a left side cross-sectional view of the oil outlet assembly of the present invention;

[0025] Figure 7 For the present invention Figure 6 A magnified view of B;

[0026] Figure 8 It is a top plan view of the combination of the hinge ball, the limit plate and the roller brush of the present invention.

[0027] In the figure: 1, machine frame; 2, bracket; 3, limit assembly; 31, V-shaped frame; 32, vertical pole; 321, hanging rod; 33, rectangular groove; 34, stop block; 35, stop ball; 36, feed port; 361, discharge cylinder; 37, discharge port; 371, take-up cylinder; 38, rubber cylinder; 4, printing roller; 5, oil discharge cylinder; 51, oil discharge assembly; 511, press frame; 512, oil bag; 513, oil discharge plate; 5130, hole Slot 1; 514, limit rope; 515, sleeve; 516, straight rod; 517, gravity ball; 52, arc groove; 521, roller 1; 53, closing plate; 531, roller 2; 532, hole groove 2; 533, push rod; 6, drive assembly; 61, turntable 1; 62, motor; 63, shaft 1; 64, turntable 2; 65, belt; 7, limit groove; 71, hinge ball; 711, limit plate; 712, roller brush. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figures 1 to 8 , the present invention provides a technical solution:

[0030] A printing machine for degradable food plastic packaging bags, such as Figures 1 to 3 As shown, it includes a machine frame 1 and a bracket 2, the number of the bracket 2 is two groups, and they are fixedly installed at the left and right positions of the lower end outer surface of the machine frame 1 respectively, the machine frame 1 is designed in a round-shaped structure, and a limit component 3 is arranged at the lower end position inside the machine frame 1, a printing roller 4 is installed inside the limit component 3, and the middle area of ​​the upper and lower end outer surfaces of the printing roller 4 is a printing area, the oil outlet cylinder 5 is movably installed at the upper end position of the printing roller 4 inside the machine frame 1, and the printing roller 4 and the oil outlet cylinder 5 are connected through a driving component 6;

[0031] The limiting assembly 3 includes a V-shaped frame 31 and a vertical rod 32, and the V-shaped frame 31 is horizontally placed inside the machine frame 1. There are four vertical rods 32, and they are movably installed at the front and rear end positions of the left and right sides of the V-shaped frame 31, respectively. The four vertical rods 32 are divided into two groups, and the left and right two vertical rods 32 form a group. A hanging rod 321 is fixedly installed between the left and right two vertical rods 32. A rectangular groove 33 is opened in the middle position of the front and rear ends of the V-shaped frame 31, and four groups of stop blocks 34 are fixedly installed in the rectangular groove 33 at equal distances from top to bottom. The outer surfaces of the upper and lower ends of the stop blocks 34 are both curved. The hanging rod 321 is horizontally arranged on the upper and lower ends of the stop blocks 34. The bottom of the vertical rod 32 is fixedly connected to the inside of the frame 1, and a ball 35 is fixedly installed on the outer surface of the other side of the block 34. The ball 35 is made of rubber, and the distance between the ball 35 and the inner wall of the rectangular groove 33 is less than the diameter of the vertical rod 32. The bottom of the V-shaped frame 31 is arranged in a curved structure, and a feed port 36 and a discharge port 37 are respectively provided at the front and rear positions of the outer surface of the lower end of the V-shaped frame 31. A discharge drum 361 and a winding drum 371 are respectively fixedly installed at the diagonal positions of the upper end of the frame 1 and the lower ends of the feed port 36 and the discharge port 37.

[0032] The driving assembly 6 includes a turntable 61, a motor 62, a rotating shaft 63, a turntable 64 and a belt 65. The rotating shaft 63 is fixedly installed on the outer surface of one side of the printing roller 4, and the turntable 61 is fixedly installed at the middle position of the outer surface of the rotating shaft 63. The rotating shaft 63 passes through the machine frame 1 and is fixedly connected to the motor 62. The turntable 64 is fixedly installed on the outer surface of one side of the oil outlet cylinder 5, and the turntable 61 and the turntable 64 are connected by a belt 65.

[0033] During operation, the free end of the roll film wound up on the unwinding drum 361 is first drawn out, and the unwinding drum 361 rotates as the roll film is drawn out, and the free end of the roll film enters from the feed port 36 of the V-shaped frame 31 in turn, is pulled out from the discharge port 37 and is wound up by the winding drum 371. When the roll film passes through the inside of the V-shaped frame 31, the printing area at the bottom of the printing roller 4 is opposite to and fits with the roll film up and down, and the motor 62 is started, and the rotating shaft 1 63 drives the printing roller 4 and the turntable 1 61 to rotate at the same time, and the turntable 2 64 driven by the turntable 1 61 through the belt 65 also rotates, thereby also driving the rotation of the oil outlet cylinder 5, and the two groups of printing areas above and below the printing roller 4 alternate with each other. When the printing area rotates to the top, ink can be added to it through the oil outlet cylinder 5, and then it is rotated downward by the needle, and the printing area stained with ink rotates to the bottom, thereby printing the surface of the roll film, and the printed roll film is continuously pulled outward as the take-up drum 371 is wound up, and the unprinted roll film passes through the unwinding drum 371. The barrel 361 is pulled outward, and the above steps are repeated to print the outer surface of the roll film. At the same time, in order to better facilitate the fit of the roll film to the printing roller 4, it is necessary to adjust the distance between the bottom of the printing roller 4 and the inside of the V-shaped frame 31 according to the thickness of the packaging bag to adapt to the printing of packaging bags of different thicknesses. During adjustment, the two sets of hanging rods 321 can be moved up and down to the position where they are connected to the abutment block 34. The hanging rods 321 first move toward the direction of the abutment ball 35, and then move the V-shaped frame 31 up or down. The hanging rods 321 abut against the abutment ball 35 and move up and down within the distance between the abutment ball 35 and the rectangular groove 33 until the hanging rods 321 move to the appropriate position, and then the hanging rods 321 are connected to the inside of the abutment block 34 at the specified position. At this time, the distance between the inside of the V-shaped frame 31 and the printing area at the bottom of the printing roller 4 can be adjusted to meet work requirements. When the oil outlet cylinder 5 drips ink on the surface of the printing roller 4, the V-shaped frame 31 can block the ink splashing from the outside of the printing roller 4.

[0034] As an embodiment of the present invention, Figure 4 As shown, the outer surface of the inner surface of the feed port 36 close to the bottom of the V-shaped frame 31 and the outer surface of the inner surface of the discharge port 37 close to the bottom of the V-shaped frame 31 are both arc-shaped, and three groups of rubber tubes 38 are embedded in the arc surface of the feed port 36, and one side of the three groups of rubber tubes 38 passes through the interior of the feed port 36.

[0035] During operation, when the rolled film comes from the inside of the discharge barrel 361 and passes through the feed port 36 and the discharge port 37 in turn, the rolled film fits against the inner walls of the grooves of the two. The design of the arc surface structure can reduce the damage to the rolled film when it is pulled up. At the same time, three groups of roller-type rubber cylinders 38 are arranged on the inner surface of the feed port 36. When the rolled film passes through the feed port 36 and enters the inside of the V-shaped frame 31, during the process of the rolled film being pulled, the outer surface of its lower end rubs against the rubber cylinder 38 and drives the rubber cylinder 38 to roll. The friction between the plastic film and the rubber material generates static electricity, which causes the rolled film to fit against the inner surface of the V-shaped frame 31 during the pulling process, thereby reducing the damage to the film caused by heavy pressure printing due to the hollowness of the rolled film.

[0036] As an embodiment of the present invention, Figure 5 and Figure 6 As shown, the oil outlet cylinder 5 is designed as a hollow structure, and the upper and lower ends of the oil outlet cylinder 5 are fixedly installed with oil outlet components 51, and the upper and lower groups of the oil outlet components 51 are relatively distributed. The oil outlet components 51 include a pressing frame 511, an oil bag 512, and an oil outlet plate 513. The pressing frame 511 is a trapezoidal structure installed in the oil outlet cylinder 5 near the lower end. The oil bag 512 is designed as an annular structure and is fixedly installed at the lower end of the pressing frame 511, and the oil outlet plate 513 is fixedly installed at the lower end of the oil bag 512. The middle part of the oil outlet plate 513 is designed as a bent structure. And it penetrates to the inner wall of the oil outlet cylinder 5 and is connected with the outside. The inside of the oil outlet plate 513 is provided with holes 5130 at equal distances. Two groups of limiting ropes 514 are fixedly installed in the middle position of the inside of the oil outlet cylinder 5, and the two are fixedly installed in the middle position of the oil outlet cylinder 5 in a cross-winding manner. A sleeve 515 is fixedly installed in the middle position of the limiting rope 514, and a straight rod 516 is connected to the inside of the sleeve 515. Gravity balls 517 are fixedly installed at the upper and lower ends of the straight rod 516. The two groups of gravity balls 517 are against the pressure frames 511 in the upper and lower groups of oil outlet components 51.

[0037] When working, the motor 62 is started, the rotating shaft 63 drives the printing roller 4 and the rotating disk 61 to rotate at a uniform speed at the same time, and the rotating disk 64 driven by the rotating disk 61 through the belt 65 also rotates, thereby driving the rotation of the oil outlet cylinder 5, and the two groups of oil outlet components 51 inside cooperate with each other to squeeze the ink onto the two groups of printing areas on the upper and lower outer surfaces of the printing roller 4 in turn. When one group of oil outlet components 51 rotates to the lower end position, the gravity ball 517 penetrates the interior of the sleeve 515 under its own gravity and presses the pressing frame 511 downward, and the pressing frame 511 moves downward under gravity and squeezes the oil bag 512, and the ink inside it An appropriate amount of oil can be discharged to the printing area on the outer surface of the upper end of the printing roller 4 at the lower end through the hole groove 5130 of the oil outlet plate 513. When the oil outlet component 51 at the lower end rotates upward with the oil outlet cylinder 5, the pressing frame 511 loses the pressure of the gravity ball 517 and stops squeezing and discharging oil. Then, with the rotation of the printing roller 4, the printing area covered with ink is rotated to the lower end to fit the surface of the roll film, thereby realizing bag printing. After printing, the printing area continues to rotate upward with the printing roller 4 and ink is added in time. In the long run, the printing area can be kept full of ink to improve the clarity of the printed fonts on the surface of the packaging bag.

[0038] As an embodiment of the present invention, Figure 5 As shown, arc grooves 52 are provided at the lower ends of the left and right sides of the inner surface of the oil outlet cylinder 5, and rollers 521 are rotatably connected to the left and right ends of the lower outer surface of the pressure frame 511, and two sets of rollers 521 are respectively rollingly connected to the inside of the arc grooves 52.

[0039] During operation, when the oil outlet assembly 51 rotates to the lower end position inside the oil outlet cylinder 5, the pressure frame 511 near the lower end is pressed downward against the oil bag 512 by the gravity of the gravity ball 517, and the rollers 521 on both sides of the pressure frame 511 slide downward along the inside of the arc groove 52. When the oil outlet assembly 51 at the lower end rotates upward, the pressure frame 511 loses the pressure of the gravity ball 517, and the rollers 521 slide back to their original positions along the inside of the arc groove 52, and at the same time can drive the pressure frame 511 to return to its original position, and the oil bag 512 stops squeezing out oil. The design purpose of the arc groove 52 and the oil bag 512 is that when the gravity ball 517 is displaced downward by gravity to squeeze the pressure frame 511, the pressure frame 511 can be accurately deformed downward, thereby squeezing the oil bag 512 to make the oil outlet plate 513 discharge ink evenly.

[0040] As an embodiment of the present invention, Figure 6 and Figure 7As shown, a closing plate 53 is movably mounted on the outer surface of the lower end of the oil outlet plate 513, and the middle position of the closing plate 53 is also bent. The length of the closing plate 53 is less than that of the oil outlet plate 513, and the left and right sides of the outer surface of the upper end of the closing plate 53 are movably connected with rollers 531. The left and right sides of the outer surface of the lower end of the oil outlet plate 513 are provided with transverse grooves, and its two groups of rollers 531 are respectively slidably connected inside the transverse grooves. The inside of the closing plate 53 is provided with hole grooves 532 at equal distances, and the hole grooves 532 and the hole grooves 5130 are displaced up and down. A push rod 533 is fixedly mounted on the upper end of the closing plate 53, and the upper end of the push rod 533 passes through the oil outlet plate 513, the oil bag 512 and the fixed connection of the pressure frame 511.

[0041] During operation, when the oil outlet assembly 51 near the lower end is squeezed by the gravity ball 517, the downward pressure of the pressing frame 511 not only facilitates squeezing the oil bag 512 to discharge the ink inside, but also the pressing frame 511 can press the push rod 533 downward, the push rod 533 penetrates the oil bag 512 and pushes the closing plate 53 downward, and the raised part in the middle of the closing plate 53 is pressed and pushes the plate body to both sides, and the second roller 531 also slides to both sides of the horizontal groove respectively, and the hole groove 1 5130 and the hole groove 2 532 are aligned with each other up and down. When the pressure frame 511 rotates upward and loses the pressure of the gravity ball 517, the push rod 533 also loses the downward pressure, the closing plate 53 returns to its original position, the hole groove 1 5130 and the hole groove 2 532 are misaligned, the oil leakage channel is opened, and the ink discharge to the outside can be stopped, so that the ink adding channel can be automatically opened and closed to reduce the waste when adding ink, and at the same time reduce the contact time between the ink in the oil bag 512 and the external air, and reduce the situation where the ink clumps and affects the use.

[0042] As an embodiment of the present invention, Figure 3 and Figure 8 As shown, the left and right sides of the inner surface of the V-shaped frame 31 are provided with limiting grooves 7 near the upper end, and a hinge ball 71 is hinged in the limiting groove 7, and one end of the hinge ball 71 is fixedly installed with a limiting plate 711, and a roller brush 712 is fixedly installed on the outer surface of one side of the limiting plate 711.

[0043] During operation, when the oil outlet assembly 51 at the lower end squeezes out ink, the ink flows down and drips onto the outer surface of the printing roller 4. As the printing roller 4 rotates, the dripped ink is stained on the outer surface of the printing roller 4. Then, through the relative movement of the printing roller 4 and the limiting plate 711, the roller brush 712 installed on one side of the limiting plate 711 can evenly spread the ink dripping on the surface of the printing roller 4 during its rotation, thereby reducing the accumulation of ink on one place on the printing surface and affecting the printing quality. In addition, the inclination angle of the limiting plate 711 can be automatically rotated and adjusted as needed.

[0044] Working principle: firstly, the free end of the rolled film wound up in the unwinding drum 361 is pulled out, and the unwinding drum 361 rotates as the rolled film is pulled out, and the free end of the rolled film enters from the feeding port 36 of the V-shaped frame 31, is pulled out from the discharging port 37 and is wound up by the winding drum 371 in sequence, and when the rolled film passes through the inside of the V-shaped frame 31, the printing area at the bottom of the printing roller 4 is opposite to and fits with the rolled film up and down, and the motor 62 is started, and the rotating shaft 1 63 drives the printing roller 4 and the turntable 1 61 to rotate at the same time, and the turntable 2 64 driven by the turntable 1 61 through the belt 65 also rotates, thereby driving the oil outlet drum 5 to rotate, and the two sets of printing areas above and below the printing roller 4 alternate with each other. When the printing area rotates to the top, The ink is replenished through the oil outlet cylinder 5, and then the printing area stained with ink is rotated downward by the needle, so that the surface of the roll film is printed, and the printed roll film is continuously pulled outward as the reel-up cylinder 371 is reeled up, and the unprinted roll film is pulled outward through the discharge cylinder 361. The above steps are repeated to print the outer surface of the roll film. At the same time, in order to better promote the fit between the roll film and the printing roller 4, the distance between the bottom of the printing roller 4 and the inside of the V-shaped frame 31 needs to be adjusted according to the thickness of the packaging bag to adapt to the printing of packaging bags of different thicknesses. When adjusting, the position of the two sets of hanging rods 321 connected to the stop block 34 can be moved up and down, and the hanging rods 321 first move toward the direction of the stop ball 35, and then move toward the stop ball 35. The V-shaped frame 31 is moved up or down, and the hanging rod 321 contacts the ball 35 and moves up and down in the space between the ball 35 and the rectangular groove 33 until the hanging rod 321 moves to a suitable position, and then the hanging rod 321 is clamped in the block 34 at the specified position. At this time, the spacing between the inside of the V-shaped frame 31 and the printing area at the bottom of the printing roller 4 can be adjusted to meet the work requirements. After the adjustment is completed, the two groups of oil outlet components 51 cooperate with each other to squeeze the ink onto the two groups of printing areas on the upper and lower outer surfaces of the printing roller 4 in turn. When one group of oil outlet components 51 rotates to the lower end position, the gravity ball 517 penetrates the inside of the sleeve 515 under its own gravity and presses the pressing frame 511 downward. , and the pressing frame 511 moves downward due to gravity and squeezes the oil bag 512, and the ink inside it can discharge a proper amount of oil bag to the printing area on the outer surface of the upper end of the printing roller 4 at the lower end through the hole groove 5130 of the oil outlet plate 513. When the oil outlet component 51 at the lower end rotates upward with the oil outlet cylinder 5, the pressing frame 511 loses the pressure of the gravity ball 517 and stops squeezing and discharging oil. Then, with the rotation of the printing roller 4, the printing area stained with ink is rotated to the lower end to stick to the surface of the roll film, thereby realizing bag printing. After printing, the printing area continues to rotate upward with the printing roller 4 and ink is added in time. In the long run, the ink in the printing area can be kept sufficient to improve the clarity of the printed fonts on the surface of the packaging bag.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A printing machine for degradable food plastic packaging bags, comprising a machine frame (1) and a bracket (2), characterized in that: The number of the brackets (2) is two groups, and they are respectively fixedly mounted on the left and right positions of the outer surface of the lower end of the machine frame (1); the machine frame (1) is designed in a circular structure, and a limit assembly (3) is arranged at the lower end position inside the machine frame (1); a printing roller (4) is installed inside the limit assembly (3), and the middle area of ​​the upper and lower outer surfaces of the printing roller (4) is a printing area; an oil outlet cylinder (5) is movably mounted inside the machine frame (1) near the upper end position of the printing roller (4), and the printing roller (4) and the oil outlet cylinder (5) are connected via a driving assembly (6); The limiting assembly (3) comprises a V-shaped frame (31) and a vertical rod (32), and the V-shaped frame (31) is horizontally placed inside the machine frame (1). There are four vertical rods (32), and they are movably installed at the front and rear ends of the left and right sides of the V-shaped frame (31). The four vertical rods (32) are divided into two groups, and the left and right vertical rods (32) form one group. A hanging rod (321) is fixedly installed between the left and right vertical rods (32). A rectangular groove (33) is opened at the middle position of the front and rear ends inside the V-shaped frame (31), and four groups of stop blocks (34) are fixedly installed at equal distances from top to bottom inside the rectangular groove (33). The upper and lower outer surfaces of the stop blocks (34) are both designed as curved surfaces. The hanging rod (321) is horizontally The vertical rod (32) is fixedly connected to the inside of the frame (1) and the other side outer surface of the vertical rod (32) is fixedly installed with a ball (35). The ball (35) is made of rubber and the distance between the ball (35) and the inner wall of the rectangular groove (33) is less than the diameter of the vertical rod (32). The bottom of the V-shaped frame (31) is arranged in a curved structure. The front and rear positions of the outer surface of the lower end of the V-shaped frame (31) are respectively provided with a feed port (36) and a discharge port (37). The lower inner surface of the frame (1) and the lower diagonal positions of the feed port (36) and the discharge port (37) are respectively fixedly installed with a discharge drum (361) and a reel-up drum (371). The driving assembly (6) comprises a turntable 1 (61), a motor (62), a rotating shaft 1 (63), a turntable 2 (64) and a belt (65); the turntable 1 (63) is fixedly mounted on the outer surface of one side of the printing roller (4), and the turntable 1 (61) is fixedly mounted at a middle position of the outer surface of the turntable 1 (63); the turntable 1 (63) passes through the machine frame (1) and is fixedly connected to the motor (62); the turntable 2 (64) is fixedly mounted on the outer surface of one side of the oil outlet cylinder (5), and the turntable 1 (61) and the turntable 2 (64) are connected by a belt (65); The oil outlet cylinder (5) is designed to be hollow in structure, and the upper and lower ends of the oil outlet cylinder (5) are both fixedly installed with oil outlet components (51), and the upper and lower groups of the oil outlet components (51) are relatively distributed. The oil outlet components (51) include a pressing frame (511), an oil-setting bag (512), and an oil outlet plate (513). The pressing frame (511) is designed to be trapezoidal in structure and is installed at a position near the lower end of the oil outlet cylinder (5). The oil-setting bag (512) is designed to be annular in structure and is fixedly installed at the lower end of the pressing frame (511), and the oil outlet plate (513) is fixedly installed at the lower end of the oil-setting bag (512). The middle part of the oil outlet plate (513) is designed to be a bent structure, and It penetrates through the inner wall of the oil outlet cylinder (5) and is connected with the outside. The inside of the oil outlet plate (513) is provided with holes (5130) at equal distances. Two groups of limit ropes (514) are fixedly installed at the middle position inside the oil outlet cylinder (5), and the two groups are fixedly installed at the middle position of the oil outlet cylinder (5) in a cross-winding manner. A sleeve (515) is fixedly installed at the middle position of the limit rope (514), and a straight rod (516) is connected to the inside of the sleeve (515). Gravity balls (517) are fixedly installed at the upper and lower ends of the straight rod (516). The two groups of gravity balls (517) are abutted against the pressure frames (511) in the upper and lower groups of oil outlet components (51); A closing plate (53) is movably mounted on the outer surface of the lower end of the oil outlet plate (513), and the middle position of the closing plate (53) is also bent. The length of the closing plate (53) is smaller than that of the oil outlet plate (513), and the left and right sides of the upper outer surface of the closing plate (53) are movably connected with two rollers (531). The left and right sides of the lower outer surface of the oil outlet plate (513) are provided with transverse grooves, and two groups of two rollers (531) are respectively slidably connected inside the transverse grooves. The interior of the closing plate (53) is provided with two hole grooves (532) at equal distances, and the two hole grooves (532) and the first hole groove (5130) are vertically offset. A push rod (533) is fixedly mounted on the upper end of the closing plate (53), and the upper end of the push rod (533) passes through the fixed connection of the oil outlet plate (513), the oil bag (512) and the pressure frame (511).

2. A printing machine for degradable food plastic packaging bags according to claim 1, characterized in that: The outer surface of the inner surface of the feed port (36) on one side close to the bottom of the V-shaped frame (31) and the outer surface of the inner surface of the discharge port (37) on one side close to the bottom of the V-shaped frame (31) are both arranged in an arc shape, and three groups of rubber tubes (38) are embedded in the arc surface of the feed port (36), and one side of the three groups of rubber tubes (38) passes through the interior of the feed port (36).

3. A printing machine for degradable food plastic packaging bags according to claim 1, characterized in that: The left and right lower ends of the inner surface of the oil outlet cylinder (5) are both provided with arc grooves (52), and the left and right ends of the lower outer surface of the pressure frame (511) are both rotatably connected with rollers one (521), and the two groups of rollers one (521) are respectively rollingly connected inside the arc grooves (52).

4. A printing machine for degradable food plastic packaging bags according to claim 1, characterized in that: Limiting grooves (7) are provided on both left and right sides of the inner surface of the V-shaped frame (31) near the upper end, and a hinge ball (71) is hinged in the limiting groove (7), and a limiting plate (711) is fixedly mounted on one end of the hinge ball (71), and a roller brush (712) is fixedly mounted on the outer surface of one side of the limiting plate (711).

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