Environment-friendly plate roller capable of controlling paint amount

Abstract

The present application relates to the technical field of plate roller, in particular to an environmental protection type plate roller capable of controlling the amount of coating, comprising a rotating roller, coaxially fixedly connected with connecting shafts at both ends of the rotating roller, the rotating roller being hollow inside to form a material cavity, the inner wall of the material cavity being symmetrically and uniformly provided with a plurality of discharge ports, the inside of each discharge port being provided with a sealing mechanism, the sealing mechanism sealing the discharge port, the rotating roller being rotatably connected with a bottom plate below, the bottom plate being an arc-shaped structure with a concave surface facing upwards and being in sliding contact with the outer wall of the rotating roller at both ends, the concave surface of the middle part of the bottom plate being in clearance fit with the outer wall of the rotating roller, one of the connecting shafts being provided with a feeding mechanism away from one end of the rotating roller, a threaded hole being formed through one side of the front wall of the rotating roller, and a threaded plug being threadedly connected in the threaded hole. The present application not only controls the amount of coating attached to the outer wall of the rotating roller, but also has the effect of assisting feeding, thereby enhancing the fineness of the coating process, reducing the waste of coating, and effectively reducing the consumption of manpower and material resources.

Description

Technical Field

[0001] This invention relates to the field of printing roller technology, and more specifically to an environmentally friendly printing roller with controllable coating dosage. Background Technology

[0002] Solvent-based inks are currently an important raw material for gravure printing in China. Although most of the solvents used in inks can be removed, a small amount of solvent may still remain and cause harm to the body. Therefore, water-based inks are gradually replacing solvent-based inks and becoming an important raw material for gravure printing.

[0003] Currently, water-based ink coating rollers are used for coating production in roller coating processes. In the current coating process, the operator usually places a container under the roller and fills it with ink coating. Then, the lower part of the roller is submerged in the ink coating. In this way, as the roller rotates, the ink coating first adheres to the surface of the adhesive layer. As the water-based ink coating rotates to the other side, it is transferred to the surface of the material to be coated.

[0004] Existing methods are simple and convenient to operate, but the coating applied to the roller surface by the roller rotating inside the coating is uncontrollable, and the thickness of the coating at each point is difficult to control. This error will have an adverse effect on the coating process. In addition, the operator needs to pay attention to the amount of coating in the trough at all times during the processing, and must ensure that the lower part of the roller is always below the coating liquid level. Although the feeding and supervision work is simple, it requires a fixed amount of manpower, which is not conducive to improving production efficiency. In view of this, the present invention proposes an environmentally friendly roller with controllable coating amount. Summary of the Invention

[0005] Technical problems to be solved In view of the above-mentioned shortcomings of the prior art, the present invention provides an environmentally friendly printing roller with controllable coating amount, which can effectively solve the problems in the prior art.

[0006] Technical solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: This invention provides an environmentally friendly printing roller with controllable paint usage, including a rotating roller, both ends of which are coaxially fixedly connected to a connecting shaft, the inside of the rotating roller is hollow to form a material cavity, and the inner wall of the material cavity has a symmetrical structure with multiple discharge ports evenly opened; The discharge port is equipped with a sealing mechanism that seals the discharge port. A base plate is rotatably connected below the rotating roller. The base plate has an arc-shaped structure with its concave surface facing upwards and both ends are in sliding contact with the outer wall of the rotating roller. The middle part of the concave surface of the base plate is in clearance fit with the outer wall of the rotating roller. One of the connecting shafts is provided with a feeding mechanism at the end away from the rotating roller. The feeding mechanism injects paint into the material cavity. A threaded hole is opened through one side of the front wall of the rotating roller, and a threaded plug is threadedly connected inside the threaded hole.

[0008] Preferably, the closing mechanism includes a movable plate, and the movable plate and the discharge port are both T-shaped structures with a larger inner side and a smaller outer side, and are plugged into each other. The outer wall of the movable plate is an arc-shaped structure and is flush with the outer wall of the rotating roller. Two slots are symmetrically opened on the inner wall of the discharge port, and plugs that plug into the slots are opened at both ends of the movable plate.

[0009] Preferably, two extrusion plates are symmetrically fixed at both ends of the movable plate, and a groove is opened on the inner wall of the material cavity to slide with the extrusion plates. Both the extrusion plates and the groove are L-shaped structures. The end of the extrusion plate away from the material cavity extends out of the groove to the outside of the rotating roller. The end of the extrusion plate away from the material cavity is an arc-shaped structure. Multiple support springs are fixed between the inner wall of the extrusion plate and the inner wall of the groove.

[0010] Preferably, two fixing plates are symmetrically fixed at both ends of the top surface of the base plate. Both fixing plates are circular and are rotatably connected to two connecting shafts. Two adapter rings are symmetrically fixed on the top surface of the base plate. The two adapter rings are coaxially sleeved on the outside of the rotating roller and rotatably connected to the rotating roller. The diameters at both ends of the rotating roller are smaller than the diameter at its center.

[0011] Preferably, a limiting ring is coaxially fixed to the upper part of the inner wall of the fixed plate, and the outer wall of the limiting ring slides in contact with the inner side wall of the extrusion plate. A support plate is fixed to the lower front side of the fixed plate, and the top surface of the support plate has an arc surface structure and presses in contact with the outer side wall of the extrusion plate. An arc-shaped plate is fixed to the rear end of the support plate, and the support plate causes the extrusion plate to slide inward along the plate groove. The arc-shaped plate slides in contact with the outer wall of the extrusion plate.

[0012] Preferably, the feeding mechanism includes a feeding pipe, the opening end of the feeding pipe near the material cavity is a frustum structure, a first partition is slidably disposed at the opening end of the feeding pipe near the material cavity, a plurality of first return springs are uniformly fixed between the side wall of the first partition away from the material cavity and the inner wall of the feeding pipe, the feeding pipe is coaxially rotatably connected to a connecting shaft on the same side, a metal flexible tube is connected to the end of the feeding pipe away from the rotating roller, a circular cavity is opened in the rotating roller at a position relative to the feeding pipe, the circular cavity is a smaller T-shaped cylindrical structure near the material cavity, the end of the feeding pipe extends through the side wall of the rotating roller into the interior of the circular cavity and is coaxially rotatably connected to the rotating roller.

[0013] Preferably, a baffle is sleeved at the end of the feed pipe relative to the reduced diameter of the circular cavity. The baffle is a three-quarter cylindrical structure. The outer arc wall of the baffle slides in contact with the inner wall of the circular cavity. Multiple side grooves are symmetrically opened at the end of the inner wall of the circular cavity away from the material cavity. The positions of the multiple side grooves correspond one-to-one with the positions of multiple plate grooves near the side of the feed pipe. A piston plate is provided at the outer end of the side groove and slides therewith. Two sliding rods are fixed between the piston plate and the corresponding extrusion plate. The outer ends of the sliding rods extend through the inner wall of the side groove into the plate groove and slide therewith.

[0014] Preferably, multiple connecting grooves are arranged in a ring between the circular cavity and the material cavity. A second partition is slidably disposed on the inner wall of the material cavity relative to the multiple connecting grooves. The second partition has a ring structure. Multiple limiting plates that slide and cooperate with the second partition are fixedly disposed on the inner wall of the material cavity relative to the second partition. Multiple circular grooves are evenly disposed on the side of the second partition near the connecting grooves. A second return spring is fixedly disposed between the inner wall of the circular groove and the inner wall of the material cavity.

[0015] Preferably, a fixed shaft is coaxially fixed to the side of the baffle near the material cavity. The connection between the fixed shaft and the baffle is an L-shaped structure and is staggered with the opening end of the feed pipe. The end of the fixed shaft away from the baffle coaxially extends through the inner wall of the circular cavity into the material cavity and is rotatably connected to the rotating roller. Multiple guide plates are uniformly fixed in a spiral shape on the outer wall of the fixed shaft relative to the inside of the material cavity. A flange is coaxially fixed to the end of one of the connecting shafts away from the rotating roller. A bearing seat is sleeved on the outer end of the outer wall of the connecting shaft. A fixing ring is fixed to the outer wall of the fixed plate. Connecting plates are fixed to both the upper and lower ends of the fixing ring. A support frame is fixed to the outer wall of the fixing ring near the feed pipe. The middle part of the support frame is sleeved on the end of the feed pipe.

[0016] Beneficial effects

[0017] The technical solution provided by this invention has the following advantages compared with the prior art: This invention is equipped with a feeding mechanism and a closing mechanism. The rotation of the rotating roller drives the opening and closing of the movable plate, thereby controlling the amount of paint entering and leaving the device. Combined with the base plate, this device not only controls the amount of paint adhering to the outer wall of the rotating roller, but also assists in the feeding process. This enhances the precision of the coating process, reduces paint waste, and effectively reduces the consumption of manpower and resources. The design is ingenious. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an exploded structural diagram of the present invention; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a schematic cross-sectional view of the movable plate structure of the present invention; Figure 6 This is a schematic cross-sectional view of the end of the rotating roller of the present invention; Figure 7 This is a schematic diagram of the side cross-section of the rotating roller structure of the present invention; Figure 8 This is a cross-sectional view of the feed tube structure of the present invention.

[0020] The labels in the diagram represent: 1. Rotating roller; 2. Connecting shaft; 3. Material cavity; 4. Discharge port; 5. Sealing mechanism; 6. Base plate; 7. Feeding mechanism; 8. Movable plate; 9. Slot; 10. Insert block; 11. Extrusion plate; 12. Plate groove; 13. Support spring; 14. Fixed plate; 15. Adapter ring; 16. Limiting ring; 17. Support plate; 18. Arc plate; 19. Feed pipe; 20. First partition plate; 21. First 21. Return spring; 22. Metal hose; 23. Circular cavity; 24. Baffle; 25. Side groove; 26. Piston plate; 27. Slide rod; 28. Connecting groove; 29. ​​Second partition plate; 30. Limiting plate; 31. Circular groove; 32. Second return spring; 33. Fixed shaft; 34. Guide plate; 35. Flange; 36. Bearing seat; 37. Fixing ring; 38. Connecting plate; 39. Support frame; 40. Threaded hole; 41. Threaded plug. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] Environmentally friendly printing rollers with controllable paint usage, see reference. Figures 1-8 It includes a rotating roller 1, with connecting shafts 2 fixedly connected to both ends of the rotating roller 1 on the same axis. The rotating roller 1 is hollow inside to form a material cavity 3. The inner wall of the material cavity 3 has a symmetrical structure with multiple discharge ports 4 evenly opened. The discharge port 4 is equipped with a sealing mechanism 5, which seals the discharge port 4. The sealing mechanism 5 includes a movable plate 8. Both the movable plate 8 and the discharge port 4 are T-shaped structures with a larger inner surface and a smaller outer surface, and they are interlocked. The outer wall of the movable plate 8 is arc-shaped and flush with the outer wall of the rotating roller 1. Two slots 9 are symmetrically opened on the inner wall of the discharge port 4. Both ends of the movable plate 8 are provided with inserts 10 that interlock with the slots 9. Two extrusion plates 11 are symmetrically fixed at both ends of the movable plate 8. The inner wall of the material cavity 3 is provided with a plate groove 12 that slides with the extrusion plates 11. Both the extrusion plates 11 and the plate groove 12 are L-shaped structures. The end of the extrusion plate 11 away from the material cavity 3 extends out of the plate groove 12 to the outside of the rotating roller 1. The end of the extrusion plate 11 away from the material cavity 3 is arc-shaped. Multiple [missing information] are fixed between the inner wall of the extrusion plate 11 and the inner wall of the plate groove 12. Supporting spring 13, two fixed plates 14 are symmetrically fixed at both ends of the top surface of the base plate 6. Both fixed plates 14 are circular structures and are rotatably connected to two connecting shafts 2 respectively. Two transition rings 15 are symmetrically fixed on the top surface of the base plate 6. The two transition rings 15 are coaxially sleeved on the outside of the rotating roller 1 and rotatably connected to the rotating roller 1. The diameters at both ends of the rotating roller 1 are smaller than the diameter at its middle. A limiting ring 16 is coaxially fixed on the upper part of the inner wall of the fixed plate 14. The outer wall of the limiting ring 16 slides in contact with the inner wall of the extrusion plate 11. A support plate 17 is fixed on the lower front side of the fixed plate 14. The top surface of the support plate 17 is an arc structure and presses in contact with the outer wall of the extrusion plate 11. An arc plate 18 is fixed on the rear end of the support plate 17. The support plate 17 causes the extrusion plate 11 to slide inward along the plate groove 12. The arc plate 18 slides in contact with the outer wall of the extrusion plate 11. A base plate 6 is rotatably connected below the rotating roller 1. The base plate 6 is an arc-shaped structure with its concave surface facing upwards, and both ends are in sliding contact with the outer wall of the rotating roller 1. The middle part of the concave surface of the base plate 6 is in clearance fit with the outer wall of the rotating roller 1. One of the connecting shafts 2, at the end furthest from the rotating roller 1, is equipped with a feeding mechanism 7. The feeding mechanism 7 injects paint into the material cavity 3. The feeding mechanism 7 includes a feeding pipe 19. The opening end of the feeding pipe 19 near the material cavity 3 is a frustum structure. A first partition 20 is slidably disposed at the opening end of the feeding pipe 19 near the material cavity 3. Multiple first return springs 21 are uniformly fixed between the side wall of the first partition 20 furthest from the material cavity 3 and the inner wall of the feeding pipe 19. The feeding pipe 19 is coaxially rotatably connected to the connecting shaft 2 on the same side. A metal hose 22 is connected to the end of the feeding pipe 19 furthest from the rotating roller 1. A circular cavity 23 is formed inside the roller 1 relative to the feed pipe 19. The circular cavity 23 is a T-shaped cylindrical structure with a smaller end near the material cavity 3. The end of the feed pipe 19 extends through the side wall of the rotating roller 1 into the circular cavity 23 and is coaxially connected to the rotating roller 1. A baffle 24 is fitted at the reduced diameter position of the end of the feed pipe 19 relative to the circular cavity 23. The baffle 24 is a three-quarter cylindrical structure. The outer arc of the baffle 24 slides in contact with the inner wall of the circular cavity 23. Multiple side grooves 25 are symmetrically formed on the inner wall of the circular cavity 23 away from the material cavity 3. The positions of the multiple side grooves 25 are the same as the multiple plate grooves 1 on the side near the feed pipe 19. The two positions correspond one-to-one. A piston plate 26 is provided at the outer end of the side groove 25 and slides therewith. Two slide rods 27 are fixed between the piston plate 26 and the corresponding extrusion plate 11. The outer ends of the slide rods 27 extend through the inner wall of the side groove 25 into the plate groove 12 and slide therewith. Multiple connecting grooves 28 are arranged in a ring between the circular cavity 23 and the material cavity 3. A second partition 29 is slidably provided on the inner wall of the material cavity 3 relative to the positions of the multiple connecting grooves 28. The second partition 29 is a ring structure. Multiple slidingly engaging parts are fixed around the inner wall of the material cavity 3 relative to the second partition 29. The limiting plate 30 and the second partition plate 29 are provided with a plurality of circular grooves 31 evenly opened on the side near the connecting groove 28. A second reset spring 32 is fixed between the inner wall of the circular groove 31 and the inner wall of the material cavity 3. A fixed shaft 33 is coaxially fixed on the side of the baffle plate 24 near the material cavity 3. The connection between the fixed shaft 33 and the baffle plate 24 is an L-shaped structure and is staggered with the opening end of the feed pipe 19. The end of the fixed shaft 33 away from the baffle plate 24 coaxially passes through the inner wall of the circular cavity 23 and extends into the material cavity 3 and is rotatably connected to the rotating roller 1. A plurality of guide plates 34 are evenly fixed in a spiral shape on the outer wall of the fixed shaft 33 relative to the inside of the material cavity 3.

[0023] One of the connecting shafts 2 is coaxially fixed to a flange 35 at the end away from the rotating roller 1. A bearing seat 36 is sleeved on the outer end of the outer wall of the connecting shaft 2. A fixing ring 37 is fixed on the outer wall of the fixing plate 14. Connecting plates 38 are fixed at both the upper and lower ends of the fixing ring 37. A support frame 39 is fixed on the outer wall of the fixing ring 37 near the feed pipe 19. The middle part of the support frame 39 is sleeved on the end of the feed pipe 19. A threaded hole 40 is opened through one side of the front wall of the rotating roller 1. A threaded plug 41 is threadedly connected to the threaded hole 40.

[0024] Working principle: The operator can connect the connecting shaft 2 on the side of the device away from the feeding mechanism 7 to the drive part on the coating equipment. A flange 35 is also provided on the connecting shaft 2 for easy fixing by the operator. Then, the operator can use the fixing frame or external support frame on the coating equipment to lift the bearing seats 36 on both sides, and then use the connecting plate 38 to fix the fixing ring 37, the fixing plate 14 and the base plate 6 at the same time, so that the three will not rotate synchronously when the rotating roller 1 rotates. Similarly, the feeding pipe 19 fixed to the fixing ring 37 and the baffle 24, the fixing shaft 33 and the multiple guide plates 34 coaxially connected to the end of the feeding pipe 19 will not rotate with the rotating roller 1. After the fixing is completed, the operator can place the container containing water-based ink paint next to the equipment, and then insert the end of the metal hose 22 away from the rotating roller 1 into the paint, so that the open end of the metal hose 22 sinks to the bottom of the paint container, thereby ensuring that the water-based ink paint can be smoothly injected into the rotating roller 1 during use. After the device is installed, the operator can use the drive mechanism on the coating equipment to drive the rotating roller 1 to rotate. During rotation, multiple sealing mechanisms 5 will rotate to the bottom in sequence. When the sealing mechanism 5 moves to the position corresponding to the support plate 17, the end of the extrusion plate 11 will be guided by the top surface of the support plate 17 to drive the movable plate 8 to move along the discharge port 4 into the material cavity 3 until the position of the extrusion plate 11 corresponds to the arc plate 18. Then, under the limiting effect of the arc plate 18, the movable plate 8 will remain inside the material cavity 3 until the extrusion plate 11 and the arc plate 18 are misaligned. After the extrusion plate 11 loses its limit, it will return to its original position under the rebound force of the support spring 13. Then the discharge port 4 will be blocked by the movable plate 8 again. The discharge port 4 and the movable plate 8 are respectively provided with a triangular prism-shaped slot 9 and a plug 10. Therefore, the two have a sealing structure similar to a labyrinth waterproof structure to prevent paint leakage. After the extrusion plate 11 rebounds, until the extrusion plate 11 is lifted by the support plate 17 again, the extrusion plate 11 will be at the outermost end of the plate groove 12 under the restriction of the limit ring 16. The discharge port 4 will be continuously sealed by the movable plate 8. During the time the movable plate 8 moves inward and is inside the material cavity 3, there is a gap between the outlet 4 and the movable plate 8. The paint in the material cavity 3 flows out along this gap and into the gap between the rotating roller 1 and the base plate 6. Because the inward movement of the movable plate 8 is extremely limited, and the gap between the movable plate 8 and the outlet 4 for the water-based ink paint to flow out is also small, the amount of paint flowing out from between them each round is relatively limited. To ensure that this limited amount of water-based ink paint can adhere to the outer wall of the rotating roller 1 and achieve a sufficient coating effect, this device... The gap between the rotating roller 1 and the base plate 6 is also set to be small, and the outer wall of the rotating roller 1 and the front and rear ends of the base plate 6 are in sliding contact. Therefore, after a small amount of water-based ink coating fully fills the space between the base plate 6 and the rotating roller 1, it can adhere to the outer wall of the rotating roller 1 during its rotation, and then rotate with it and finally be coated onto the surface of the material to be coated. The movable plate 8 is kept flush with the outer wall of the rotating roller 1 under the restriction of the limiting ring 16. Therefore, the movable plate 8 also plays the role of coating the surface of the material to be coated during the rotation of the rotating roller 1. As the extrusion plate 11 moves back and forth, the feeding mechanism 7 also injects paint into the material cavity 3. When the extrusion plate 11 moves inward, it pushes the piston plate 26 towards the inside of the side groove 25 via the slide rod 27. This push compresses the space inside the circular cavity 23, and the air inside can only flow from the baffle 24 into the smaller diameter space of the circular cavity 23. This air pressure then pushes open the second partition 29, and the paint between the reduced diameter position of the circular cavity 23 and the baffle 24 flows into the material cavity 3 from the connecting groove 28. By setting the size of the side groove 25, this device can control the amount of paint flowing into the material cavity 3 each time to be consistent with the amount of paint flowing out of the outlet 4 in each round, ensuring that there is always enough paint inside the material cavity 3 to be output. Then, during the resetting process of the extrusion plate 11, the piston plate 26 will move along the side groove 25 again. As the groove 25 moves outward, the space inside the circular cavity 23 will increase, requiring air to be added from the outside. However, the second partition 29 can only move outward, so it will not move. On the other hand, the first partition 20 in the feed pipe 19 will move into the circular cavity 23, thereby opening the opening end of the feed pipe 19 in the circular cavity 23. Then, the external air pressure will push the paint from the container into the gap formed by the baffle 24 and the inner wall of the circular cavity 23, waiting to be pressed into the material cavity 3. The paint temporarily stored in the material cavity 3 will be continuously agitated by the action of multiple guide plates 34. The guide plates 34 themselves are stationary, but the rotating roller 1 is rotating, so they can agitate the paint. This design is to increase the fluidity of the paint and avoid the formation of lumps or separation of water-based ink paint. It should be noted that the discharge port 4 in this device is symmetrically arranged. There are positions without discharge ports 4 on both the front and rear sides of the rotating roller 1. Before the device is put into use, the operator can rotate the closed position with the threaded hole 40 to the top. The corresponding closed position on the other side will then correspond to the lower support plate 17 and the arc plate 18. In this way, the movable plate 8 will not move inward due to the influence of the support plate 17 and the arc plate 18. The operator can then unscrew the threaded plug 41 to pre-inject a portion of the coating into the material cavity 3. This ensures that the amount of coating inside the material cavity 3 will not be insufficient to support the amount of coating flowing out due to adhesion to the inner wall of the material cavity 3 during rotation, thus ensuring the smooth progress of the coating work. Furthermore, the threaded hole 40 is located at the edge of the rotating roller 1 and will not come into contact with the material to be coated during use. The threaded plug 41 itself is also designed with a T-shaped structure, making it convenient for the operator to hold its thinner part and unscrew it out of the threaded hole 40.

[0025] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An environmentally friendly printing roller with controllable paint usage, including a rotating roller, characterized in that: Both ends of the rotating roller are coaxially fixedly connected to a connecting shaft. The inside of the rotating roller is hollow to form a material cavity. The inner wall of the material cavity has a symmetrical structure with multiple discharge ports evenly opened. The discharge port is equipped with a sealing mechanism that seals the discharge port. A base plate is rotatably connected below the rotating roller. The base plate has an arc-shaped structure with its concave surface facing upwards and both ends are in sliding contact with the outer wall of the rotating roller. The middle part of the concave surface of the base plate is in clearance fit with the outer wall of the rotating roller. One of the connecting shafts is provided with a feeding mechanism at the end away from the rotating roller. The feeding mechanism injects paint into the material cavity. A threaded hole is provided through one side of the front wall of the rotating roller, and a threaded plug is threadedly connected in the threaded hole. The closing mechanism includes a movable plate. The movable plate and the discharge port are both T-shaped structures with a larger inner side and a smaller outer side, and they are plugged into each other. The outer wall of the movable plate is an arc-shaped structure and is flush with the outer wall of the rotating roller. Two slots are symmetrically opened on the inner wall of the discharge port. Both ends of the movable plate are provided with plugs that are plugged into the slots. Two extrusion plates are symmetrically fixed at both ends of the movable plate. The inner wall of the material cavity is provided with a plate groove that slides with the extrusion plates. Both the extrusion plates and the plate grooves are L-shaped structures. The end of the extrusion plate away from the material cavity extends out of the plate groove to the outside of the rotating roller. The end of the extrusion plate away from the material cavity is an arc-shaped structure. Multiple support springs are fixed between the inner wall of the extrusion plate and the inner wall of the plate groove.

2. The environmentally friendly printing roller with controllable paint usage according to claim 1, characterized in that: Two fixing plates are symmetrically fixed at both ends of the top surface of the base plate. Both fixing plates are circular and are rotatably connected to two connecting shafts. Two adapter rings are symmetrically fixed on the top surface of the base plate. The two adapter rings are coaxially sleeved on the outside of the rotating roller and rotatably connected to the rotating roller. The diameters at both ends of the rotating roller are smaller than the diameter at its middle.

3. The environmentally friendly printing roller with controllable paint usage according to claim 2, characterized in that: A limiting ring is coaxially fixed to the upper part of the inner wall of the fixed plate. The outer wall of the limiting ring slides in contact with the inner wall of the extrusion plate. A support plate is fixed to the lower front side of the fixed plate. The top surface of the support plate is an arc surface structure and presses against the outer wall of the extrusion plate. An arc-shaped plate is fixed to the rear end of the support plate. The support plate causes the extrusion plate to slide inward along the plate groove. The arc-shaped plate slides in contact with the outer wall of the extrusion plate.

4. The environmentally friendly printing roller with controllable paint usage according to claim 3, characterized in that: The feeding mechanism includes a feeding pipe. The opening end of the feeding pipe near the material cavity is a frustum structure. A first partition is slidably disposed on the opening end of the feeding pipe near the material cavity. A plurality of first return springs are uniformly fixed between the side wall of the first partition away from the material cavity and the inner wall of the feeding pipe. The feeding pipe is coaxially rotatably connected to a connecting shaft on the same side. A metal hose is connected to the end of the feeding pipe away from the rotating roller. A circular cavity is opened in the rotating roller at a position relative to the feeding pipe. The circular cavity is a T-shaped cylindrical structure with a smaller end near the material cavity. The end of the feeding pipe extends through the side wall of the rotating roller into the interior of the circular cavity and is coaxially rotatably connected to the rotating roller.

5. The environmentally friendly printing roller with controllable paint usage according to claim 4, characterized in that: A baffle is fitted at the end of the feed pipe relative to the reduced diameter of the circular cavity. The baffle is a three-quarter cylindrical structure. The outer arc wall of the baffle slides in contact with the inner wall of the circular cavity. Multiple side grooves are symmetrically opened at the end of the inner wall of the circular cavity away from the material cavity. The positions of the multiple side grooves correspond one-to-one with the positions of multiple plate grooves near the side of the feed pipe. A piston plate is provided at the outer end of the side groove and slides with it. Two sliding rods are fixed between the piston plate and the corresponding extrusion plate. The outer ends of the sliding rods extend through the inner wall of the side groove into the plate groove and slide with the rotating roller.

6. The environmentally friendly printing roller with controllable paint usage according to claim 5, characterized in that: Multiple connecting grooves are arranged in a ring between the circular cavity and the material cavity. A second partition is slidably disposed on the inner wall of the material cavity relative to the multiple connecting grooves. The second partition has a ring structure. Multiple limiting plates that slide and cooperate with the second partition are fixedly disposed on the inner wall of the material cavity relative to the second partition. Multiple circular grooves are evenly disposed on the side of the second partition near the connecting grooves. A second return spring is fixedly disposed between the inner wall of the circular groove and the inner wall of the material cavity.

7. The environmentally friendly printing roller with controllable paint usage according to claim 6, characterized in that: A fixed shaft is coaxially fixed to the side of the baffle near the material cavity. The connection between the fixed shaft and the baffle is L-shaped and intersects with the opening end of the feed pipe. The end of the fixed shaft away from the baffle coaxially extends through the inner wall of the circular cavity into the material cavity and is rotatably connected to the rotating roller. Multiple guide plates are uniformly fixed in a spiral shape on the outer wall of the fixed shaft relative to the inside of the material cavity. A flange is coaxially fixed to the end of one of the connecting shafts away from the rotating roller. A bearing seat is sleeved on the outer end of the outer wall of the connecting shaft. A fixing ring is fixed to the outer wall of the fixed plate. Connecting plates are fixed to both the upper and lower ends of the fixing ring. A support frame is fixed to the outer wall of the fixing ring near the feed pipe. The middle part of the support frame is sleeved on the end of the feed pipe.

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