A cigarette packaging offset printing quick positioning clamping device

Abstract

The present application relates to printing equipment technical field, disclose a kind of cigarette packaging offset printing quick positioning clamping device.The present application includes: fixed frame, two clamping mechanisms and the cleaning mechanism for automatically flushing clamping mechanism are provided on the fixed frame;Clamping mechanism includes the T-shaped sleeve rotationally connected with the fixed frame, T-shaped sleeve is provided with the T-shaped top shaft that can be axially telescopic, by telescopic plate roller is clamped and limited, T-shaped sleeve and T-shaped top shaft between being provided with the bellow for blocking ink intrusion;Cleaning mechanism includes the slot ring covered in the bellow outside, slot ring is provided with the annular nozzle connected with external water supply equipment and the absorption cavity connected with external water pumping equipment.The present application effectively solves the ink pollution problem by physical isolation and automatic cleaning, improves equipment life and production efficiency.

Description

Technical Field

[0001] This invention relates to the field of printing equipment technology, and in particular to a rapid positioning and clamping device for offset printing of cigarette packaging. Background Technology

[0002] As an important branch of the high-speed printing industry, the production quality and efficiency of cigarette packaging are directly dependent on the stability of the printing equipment. In the offset printing process of cigarette packaging, the printing roller (also known as the printing plate cylinder) is the core executing component, and the precisely positioned shaft ends at both ends are crucial to ensuring the rotational accuracy and positioning stability of the printing roller during the clamping process.

[0003] Currently, existing offset printing positioning and clamping devices for cigarette packaging have significant limitations in practical applications. Because cigarette packaging printing often uses fast-drying inks and the production environment is relatively open, ink on the printing roller easily spills onto the shaft ends of the roller during the printing process, forming stubborn ink stains.

[0004] Traditional clamping devices lack effective isolation or protection structures for the shaft head, forcing operators to periodically stop the machine to manually clean the shaft head. According to production site statistics, each cleaning of ink contamination on the shaft head takes an additional 5-10 minutes, which not only interrupts the normal production process and reduces the effective operating rate of the equipment, but also increases the labor intensity of the operators.

[0005] If spilled ink contamination is not cleaned up in time, ink particles will enter the mating surfaces of the clamping bearings as the shaft rotates, causing abrasive wear. This accelerates bearing wear, leading to decreased clamping and positioning accuracy, and may even cause excessive radial runout of the printing roller, directly affecting the registration accuracy of the printed materials. Consequently, equipment maintenance costs increase, bearing replacement frequency rises, and the equipment's lifespan is affected.

[0006] Therefore, it is necessary to propose a new rapid positioning and clamping device for offset printing of cigarette packaging to solve the above-mentioned technical problems. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention provides a rapid positioning and clamping device for offset printing of cigarette packaging.

[0008] The present invention is achieved by the following technical solution: a fixed frame, wherein the fixed frame is provided with two clamping mechanisms with protective structures and a cleaning mechanism for automatically rinsing the clamping mechanisms; The clamping mechanism includes a T-shaped sleeve rotatably connected to the fixed frame. The T-shaped sleeve is provided with an axially telescopic T-shaped top shaft, which can clamp and limit the printing roller by telescopic movement. A bellows is provided between the T-shaped sleeve and the T-shaped top shaft to block spilled ink and prevent it from entering the printing roller head or the T-shaped top shaft. The cleaning mechanism includes a grooved ring covering the corrugated pipe, and the grooved ring is provided with an annular spray pipe connected to an external water supply device and an absorption chamber connected to an external water pumping device. When the corrugated pipe is contaminated with ink, the annular spray pipe sprays out cleaning liquid for cleaning, and the waste liquid is collected by the grooved ring and flows into the absorption chamber before being discharged.

[0009] Preferably, the cleaning mechanism is movably mounted on a fixed frame, so that the cleaning mechanism can also pre-wash the ink on the printing roller by moving it when changing the printing roller.

[0010] Preferably, the grooved ring is further provided with an air chamber connected to an external air supply mechanism, and the inner peripheral wall of the grooved ring is provided with two 360° annular air jets communicating with the air chambers; so that when the cleaning mechanism cleans the printing roller, the annular air jets form an air wall between the grooved ring and the printing roller, thereby preventing the cleaning liquid from overflowing the receiving range of the grooved ring and causing leakage; at the same time, the sprayed airflow can also accelerate the drying of the printing roller.

[0011] Preferably, a drive motor is fixedly installed at both ends of the fixing frame, and a first bidirectional screw and a second bidirectional screw are rotatably installed on the fixing frame, and the two drive motors are respectively connected to the first bidirectional screw and the second bidirectional screw for transmission. Both ends of the first bidirectional screw are threaded with drive frames, and the other ends of the two drive frames are rotatably connected to two T-shaped top shafts, thereby realizing the axial extension and retraction of the two T-shaped top shafts and completing the clamping and limiting of the printing roller. The second bidirectional screw is threaded with two movable blocks that are slidably connected to the first bidirectional screw. The movable blocks are fixedly connected to the connecting frame of the grooved ring, thereby realizing the synchronous movement of the two cleaning mechanisms and completing the comprehensive cleaning of the printing roller.

[0012] Preferably, a plugging ring for sealing the corresponding annular air jet is also elastically provided on the side where the two grooved rings are close together; in this way, when the two grooved rings abut each other, the two plugging rings seal the annular air jet on that side by squeezing each other, thereby releasing the air wall on that side from restricting the water flow, allowing the cleaning fluid to overflow into the blind area between the two and clean the ink in that area.

[0013] Preferably, the portion of the blocking ring extending into the grooved ring is fixedly fitted with a funnel-shaped guide ring; when the blocking ring blocks the annular jet nozzle, it will also simultaneously drive the guide ring to move into the annular nozzle, guiding the sprayed cleaning fluid to the cleaning blind zone between the two cleaning mechanisms, further improving the cleaning effect.

[0014] Preferably, the blocking ring is provided with a plurality of sliding rods that penetrate into the grooved ring. The sliding rods are fitted with springs at both ends that abut against the grooved ring and the blocking ring respectively. The ends of the plurality of sliding rods that are inside the grooved ring are all connected to the guide ring.

[0015] Preferably, the ends of the two T-shaped top shafts that are close to each other are set as hexagonal pyramids so as to connect with the printing rollers with hexagonal pyramidal grooves at both ends; the ends of the two T-shaped top shafts that are close to each other can also be set as hexagonal pyramidal grooves to accommodate printing rollers with hexagonal pyramidal shaft ends.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: A novel printing roller clamping and positioning device is formed by setting a rotatable T-shaped sleeve and a T-shaped top shaft that can slide telescopically with the T-shaped sleeve, and setting a bellows between the two. This device can clamp and position the printing roller while forming a physical barrier between itself and the printing roller, effectively preventing ink from spilling onto the bearing mating surface during the printing process. This completely eliminates the abrasive wear of ink stains on the shaft head, avoids the decrease in clamping accuracy and radial runout of the printing roller caused by bearing wear, and thus greatly extends the service life of the clamping mechanism and reduces equipment maintenance costs. By setting up a movable cleaning mechanism, not only can the barrier mechanism (corrugated pipe) be cleaned, but the printing roller can also be thoroughly cleaned by moving it. On the one hand, it automatically washes the oil stains on the corrugated pipe to prevent drying; on the other hand, it automatically washes the surface of the printing roller when changing the printing plate. Compared with the traditional method that requires manual shutdown for 5-10 minutes for cleaning, this device achieves cleaning without stopping the machine or quickly changing the printing plate, which greatly improves the effective operating rate of the equipment and reduces the labor intensity of the operators. By designing a 360° annular jet nozzle on the grooved ring, an air wall can be formed between the grooved ring and the printing roller with the help of an external air supply mechanism. This design not only precisely restricts the cleaning fluid within the receiving range of the grooved ring to prevent secondary pollution, but also accelerates the drying of the printing roller through high-speed airflow, realizing the integrated operation of cleaning, leak prevention and drying, and ensuring the cleanliness of the production environment. To address the potential cleaning blind spots between the two cleaning mechanisms on the printing roller, a linkage mechanism combining an elastic blocking ring and a guide ring was designed. When the two cleaning mechanisms move to the central area and come into contact, the blocking ring is compressed to automatically seal the air wall, and the guide ring automatically guides the flow, concentrating the cleaning fluid sprayed into the blind spot. This ensures thorough cleaning along the entire length of the printing roller, improving the consistency of the cleaning effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the cigarette packaging offset printing quick positioning and clamping device of the present invention. Figure 2 This is a partial cross-sectional perspective view of the cigarette packaging offset printing quick positioning and clamping device of the present invention. Figure 3 for Figure 2 Enlarged view of a local structure; Figure 4This is a partial cross-sectional top view of the cigarette packaging offset printing quick positioning and clamping device of the present invention; Figure 5 for Figure 4 Enlarged view of a local structure; Figure 6 This is an assembly diagram showing the clamping mechanism and the cleaning mechanism; Figure 7 This is a breakdown diagram of the clamping mechanism; Figure 8 This is a three-dimensional partial sectional view and a two-dimensional sectional view of the cleaning mechanism; Figure 9 A side view sectional view of the cleaning unit and a partial enlarged view; Figure 10 This is a breakdown diagram of the mounting bracket; Figure 11 This is a cleaning demonstration diagram of the cigarette packaging offset printing quick positioning and clamping device of the present invention. Figure 12 This is a demonstration diagram of the actual application of the cigarette packaging offset printing quick positioning and clamping device of the present invention.

[0018] Explanation of key symbols: 1. Fixing frame; 2. Clamping mechanism; 201. T-shaped sleeve; 202. T-shaped top shaft; 203. Bellows; 3. Cleaning mechanism; 301. Groove ring; 302. Air chamber; 303. Suction chamber; 304. Annular nozzle; 305. Plug ring; 306. Slide rod; 307. Spring; 308. Guide ring; 4. Drive motor; 5. First bidirectional screw; 6. Second bidirectional screw; 7. Drive frame; 8. Moving block; 9. Connecting pipe. Detailed Implementation

[0019] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0020] Please combine Figures 1 to 12 The cigarette packaging offset printing quick positioning clamping device of this embodiment includes a fixed frame 1. On the fixed frame 1, there are two clamping mechanisms 2 with the same structure and protective structure (located on the left and right sides of the fixed frame 1 respectively), and two cleaning mechanisms 3 for automatically rinsing the clamping mechanisms. Specifically, the clamping mechanism 2 includes a T-shaped sleeve 201 rotatably connected to the fixed frame 1. Inside the T-shaped sleeve 201 is a T-shaped top shaft 202 that can extend and retract axially (the two are slidably connected by a spline; meanwhile, the T-shaped sleeve 201 also has a reserved area for installing a transmission gear, allowing it to be driven by the offset printing machine's drive mechanism). By driving the two T-shaped top shafts 202 to extend, the shaft ends at both ends of the printing roller can be clamped, achieving rapid clamping and positioning of the printing roller. To prevent ink overflow during printing from flowing along the printing roller shaft ends and intruding into the mating gap between the T-shaped sleeve 201 and the T-shaped top shaft 202, causing shaft end corrosion or top shaft jamming, a flexible bellows 203 is provided between the T-shaped sleeve 201 and the T-shaped top shaft 202, effectively blocking the intrusion of external ink. The cleaning mechanism 3 includes a grooved ring 301 covering the outside of the corrugated pipe 203. Inside the grooved ring 301, two functional chambers are integrated: one is an annular spray pipe 304 connected to an external water supply device (such as a water pump or water tank), and the other is a suction chamber 303 connected to an external water pumping device (such as a water pump or waste liquid recovery tank). When the outside of the corrugated pipe 203 is contaminated with ink and needs to be cleaned, the annular spray pipe 304 sprays cleaning fluid onto the surface of the corrugated pipe 203 for rinsing (periodic rinsing can be set). The waste liquid after rinsing flows into the groove of the grooved ring 301 under gravity for collection, and finally converges into the suction chamber 303, where it is extracted by the external water pumping device and treated uniformly, thus preventing ink from drying and hardening. When replacing printing rollers, the old rollers generally need to be cleaned before removal. To achieve automatic cleaning of the printing rollers, the cleaning mechanism 3 is movably mounted on the fixed frame 1. Thus, when the printing roller needs to be replaced after completing a printing task, the cleaning mechanism 3 can move along the roller axis under the drive of the drive device, rinsing the surface of the rotating roller during the movement, thereby removing residual ink from the roller in advance and reducing the burden of manual cleaning.

[0021] Through the above technical solutions, a new type of printing roller clamping and positioning device is formed, which can achieve clamping and positioning of the printing roller while forming a physical barrier between the roller and the roller, effectively preventing ink from overflowing to the bearing mating surface during the printing process. This completely eliminates the abrasive wear of ink stains on the shaft head, avoids the decrease in clamping accuracy and radial runout of the printing roller caused by bearing wear, thereby greatly extending the service life of the clamping mechanism and reducing equipment maintenance costs. By setting up a movable cleaning mechanism 3, not only can the barrier mechanism (corrugated pipe 203) be cleaned, but the printing roller can also be thoroughly cleaned by moving it. On the one hand, it automatically washes the oil stains on the corrugated pipe 203 to prevent drying; on the other hand, it automatically washes the surface of the printing roller when changing the printing plate. Compared with the traditional method that requires manual shutdown for 5-10 minutes for cleaning, this device achieves cleaning without stopping the machine or quickly changing the printing plate, which greatly improves the effective operating rate of the equipment and reduces the labor intensity of the operators.

[0022] Please combine Figure 5 and Figure 9 As a further improvement of the present invention, to prevent the cleaning fluid from splashing or overflowing from the edge of the grooved ring 301 during rinsing and causing equipment contamination, the grooved ring 301 is also provided with an air chamber 302 connected to an external air supply mechanism (such as a fan or air source). Simultaneously, two exhaust ports 3011, arranged in a 360° annular pattern and communicating with the air chamber 302, are provided on the inner peripheral wall of the grooved ring 301. During cleaning operations, a high-pressure airflow is introduced into the air chamber 302, and the airflow is ejected at high speed from the annular exhaust ports 3011, forming an annular air wall between the inner wall of the grooved ring 301 and the outer surface of the printing roller. This effectively confines the cleaning fluid within the receiving range of the grooved ring 301, preventing liquid overflow. At the same time, the ejected high-speed airflow also accelerates the drying process of the cleaning fluid on the printing roller surface, improving cleaning efficiency. The connecting frame of the grooved ring 301 is provided with three connecting pipes 9 for external connection. The three connecting pipes 9 are respectively connected to the air chamber 302, the suction chamber 303 and the annular nozzle 304, while the other end of the three connecting pipes 9 is used to connect to the external hose.

[0023] Through the above technical solution, this design not only precisely limits the cleaning fluid within the receiving range of the groove ring 301 to prevent secondary pollution, but also accelerates the drying of the printing roller through high-speed airflow, realizing integrated operation of cleaning, leak prevention and drying, and ensuring the cleanliness of the production environment.

[0024] Please combine Figure 9 To address the potential cleaning blind spot issue that may exist when the two cleaning mechanisms 3 move to the middle position of the printing roller, this embodiment also elastically provides a blocking ring 305 on the side (i.e., the inner side) where the two grooved rings 301 are close to each other. The blocking ring 305 is used to block the corresponding annular air jet 3011; Specifically, a plurality of annularly distributed sliding rods 306 are provided on the side of the blocking ring 305 near the grooved ring 301. Springs 307 are fitted onto the sliding rods 306, with one end of each spring extending into the grooved ring 301. The two ends of the springs 307 respectively abut against the grooved ring 301 and the blocking ring 305, keeping the blocking ring 305 away from the annular air jet 3011 in its natural state. When the two cleaning mechanisms 3 move towards each other to their extreme positions (i.e., the inner sides of the two grooved rings 301 approach or contact each other), the two blocking rings 305 will press against each other, overcoming the elastic force of the springs 307 and moving inward into the grooved ring 301, thereby blocking the annular air jet 3011 located on the inner side. After the annular air jet 3011 is blocked, the air wall on that side disappears, eliminating the restriction on water flow. At this time, the cleaning fluid sprayed from the annular nozzle 304 can smoothly cross the edge of the grooved ring 301 and overflow into the central blind area between the two cleaning mechanisms 3, effectively cleaning the ink in that area.

[0025] To further optimize the cleaning effect on blind spots, a limiting ring is fitted onto the slide rod 306 extending from the plugging ring 305 into the grooved ring 301. One side of the limiting ring abuts against the inner wall of the grooved ring 301, while the other side is limited by a nut threaded onto the slide rod 306 (one end of the slide rod is threaded). A funnel-shaped guide ring 308 is fixedly installed on the limiting ring. When the plugging ring 305 is squeezed and moves inward to block the annular jet nozzle 3011, it simultaneously drives the guide ring 308 to move inward, so that one end of its funnel-shaped opening inserts into or approaches the nozzle of the annular nozzle 304. The funnel-shaped structure of the guide ring 308 can concentrate and guide the cleaning fluid sprayed from the annular nozzle 304, making it spray more concentratedly and powerfully onto the cleaning blind spot between the two cleaning mechanisms 3, thereby significantly improving the rinsing force and cleaning effect of this area.

[0026] With the above technical solution, when the two cleaning mechanisms 3 move to the central area and come into contact, the blocking ring 305 is squeezed and automatically seals the air wall, and the guide ring 308 automatically guides the flow, concentrating the cleaning liquid sprayed into the blind area, ensuring that the entire length of the roller is cleaned without dead angles, and improving the consistency of the cleaning effect.

[0027] Please combine Figure 5 and Figure 9As a preferred driving scheme, drive motors 4 are fixedly installed at both ends of the fixed frame 1. A first bidirectional screw 5 and a second bidirectional screw 6 are rotatably installed on the fixed frame 1. The two drive motors 4 are respectively connected to the first bidirectional screw 5 and the second bidirectional screw 6 through gears (the threads of the first bidirectional screw 5 are located at both ends, while the threads of the second bidirectional screw 6 are located in the middle area, so that the first bidirectional screw 5 can also serve as a limiting slide bar for the moving block 8). The threaded areas at both ends of the first bidirectional screw 5 are threaded with drive frames 7, and the other ends of the two drive frames 7 are respectively rotatably connected to one end of the two T-shaped top shafts 202. When the drive motor 4 drives the first bidirectional screw 5 to rotate, the two drive frames 7 will respectively drive the corresponding T-shaped top shafts 202 to move towards the middle or separate towards both ends, thereby realizing the axial extension and retraction of the T-shaped top shafts 202 and completing the automatic clamping and release of the printing roller.

[0028] Two movable blocks 8 are threaded onto the second bidirectional screw 6, and these two movable blocks 8 are also slidably fitted onto the first bidirectional screw 5 (slidably fitted onto the non-threaded area in the middle), and are fixedly connected to the connecting frame of the corresponding grooved ring 301. When another drive motor 4 drives the second bidirectional screw 6 to rotate, the two movable blocks 8 will drive the two cleaning mechanisms 3 to move towards each other or away from each other, thereby achieving comprehensive cleaning of the entire length of the printing roller. This structure, driven synchronously by the bidirectional screw, ensures the synchronicity of the actions of the two clamping mechanisms 2 and the two cleaning mechanisms 3, while the two cleaning mechanisms 3 also make the cleaning efficiency of the printing roller higher.

[0029] To accommodate printing rollers with different shaft head structures and improve the versatility of the device, the ends of the two T-shaped top shafts 202 that are close to each other can be configured as hexagonal pyramids. This structure is suitable for printing rollers with hexagonal pyramidal grooves at both ends of the shaft head. The hexagonal pyramids are inserted into the conical grooves, achieving both centering and torque transmission. As an equivalent alternative, the ends of the two T-shaped top shafts 202 that are close to each other can also be configured as hexagonal pyramidal grooves. Accordingly, this structure is suitable for printing rollers with hexagonal pyramidal shaft heads. This design allows the clamping device to be compatible with a variety of common printing roller interface types.

[0030] The implementation principle of the cigarette packaging offset printing quick positioning and clamping device in this application embodiment is as follows: During use, ink overflowing from both ends of the printing roller is blocked by the corrugated pipe 203, while the annular nozzle 304 cleans the corrugated pipe 203 by spraying out cleaning fluid. Subsequently, the wastewater is received by the grooved ring 301 and flows into the suction chamber 303 and is discharged through the corresponding connecting pipe 9 and the external pumping equipment. When replacing the printing roller, first, the inking roller and blanket cylinder on the offset printing press are separated from the printing roller. Then, the corresponding drive motor 4 is started. The drive motor 4 drives the second bidirectional screw 6 to rotate through gears. The second bidirectional screw 6 drives the two cleaning mechanisms 3 to move closer to each other (at this time, the inking roller and blanket cylinder will not obstruct the cleaning mechanism 3). During the cleaning process, high-pressure airflow is introduced into the air chamber 302 and sprayed out through the annular jet nozzle 3011 on the grooved ring 301, forming two annular air walls between the printing roller and the grooved ring 301. This air curtain can effectively limit the cleaning liquid within the receiving area, preventing liquid splashing or overflow from contaminating the equipment. At the same time, the high-speed airflow can also accelerate the drying of the printing roller. When the two cleaning mechanisms 3 move to the middle position of the printing roller, the blocking rings 305 on their sides will squeeze each other. This action will block the inner annular air jet 3011, release the air wall restriction on that side, and at the same time drive the inner trumpet-shaped guide ring 308 to move to the annular nozzle 304, concentrating the cleaning fluid and guiding it to the middle blind area between the two cleaning mechanisms 3, achieving thorough cleaning without dead angles, and eliminating concerns about sewage leakage.

[0031] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A rapid positioning and clamping device for offset printing of cigarette packaging, characterized in that: Includes a fixed frame (1), on which two clamping mechanisms (2) with protective structures are provided, and a cleaning mechanism (3) for automatic rinsing clamping mechanisms (2); The clamping mechanism (2) includes a T-shaped sleeve (201) rotatably connected to the fixed frame (1). The T-shaped sleeve (201) is provided with an axially extendable T-shaped top shaft (202), which can clamp and limit the printing roller by extension and retraction. A bellows (203) is provided between the T-shaped sleeve (201) and the T-shaped top shaft (202) to block the spilled ink and prevent it from entering the printing roller head or the T-shaped top shaft (202). The cleaning mechanism (3) includes a grooved ring (301) covering the corrugated pipe (203). The grooved ring (301) is provided with an annular nozzle (304) connected to an external water supply device and an absorption chamber (303) connected to an external water pumping device. When the corrugated pipe (203) is contaminated with ink, the annular nozzle (304) sprays out cleaning liquid for cleaning. The waste liquid is collected by the grooved ring (301) and flows into the absorption chamber (303) before being discharged.

2. The cigarette packaging offset printing quick positioning and clamping device as described in claim 1, characterized in that, The cleaning mechanism (3) is movably mounted on the fixed frame (1), so that the cleaning mechanism (3) can also pre-wash the ink on the printing roller by moving when changing the printing roller.

3. The cigarette packaging offset printing quick positioning and clamping device as described in claim 2, characterized in that, The grooved ring (301) is also provided with an air chamber (302) connected to an external air supply mechanism. The inner peripheral wall of the grooved ring (301) is provided with two 360° annular air jets (3011) that communicate with the air chambers (302). This allows the cleaning mechanism (3) to form an air wall between the grooved ring (301) and the printing roller by using the annular air jets (3011) when cleaning the printing roller.

4. The cigarette packaging offset printing quick positioning and clamping device as described in claim 1, characterized in that, Both ends of the fixed frame (1) are fixedly installed with drive motors (4), and the fixed frame (1) is rotatably installed with a first bidirectional screw (5) and a second bidirectional screw (6). The two drive motors (4) are respectively connected to the first bidirectional screw (5) and the second bidirectional screw (6) for transmission. Both ends of the first bidirectional screw (5) are threaded with drive frames (7), and the other ends of the two drive frames (7) are rotatably connected to two T-shaped top shafts (202), so as to realize the axial extension and retraction of the two T-shaped top shafts (202) and complete the clamping and limiting of the printing roller. The second bidirectional screw (6) is threaded with two movable blocks (8) that are slidably connected to the first bidirectional screw (5). The movable blocks (8) are fixedly connected to the connecting frame of the groove ring (301) so as to realize the synchronous movement of the two cleaning mechanisms (3) and complete the comprehensive cleaning of the printing roller.

5. The cigarette packaging offset printing quick positioning and clamping device as described in claim 3, characterized in that, On the side where the two grooved rings (301) are close to each other, there is also a plugging ring (305) for sealing the corresponding annular air jet (3011); thus, when the two grooved rings (301) come into contact, they squeeze each other to make the two plugging rings (305) seal the annular air jet (3011) on that side, release the air wall on that side from the restriction of water flow, and allow the cleaning liquid to overflow into the blind area between the two and clean the ink in that area.

6. The cigarette packaging offset printing quick positioning and clamping device as described in claim 5, characterized in that, The portion of the plugging ring (305) extending into the grooved ring (301) is fixedly fitted with a funnel-shaped guide ring (308); when the plugging ring (305) blocks the annular jet nozzle (3011), it will also simultaneously drive the guide ring (308) to move into the annular nozzle (304), guiding the sprayed cleaning fluid to the cleaning blind area between the two cleaning mechanisms (3), further improving the cleaning effect.

7. The cigarette packaging offset printing quick positioning and clamping device as described in claim 6, characterized in that, The blocking ring (305) is provided with multiple sliding rods (306) that penetrate into the grooved ring (301). The sliding rods (306) are fitted with springs (307) at both ends that abut against the grooved ring (301) and the blocking ring (305) respectively. The ends of the multiple sliding rods (306) inside the grooved ring (301) are all connected to the guide ring (308).

8. The cigarette packaging offset printing quick positioning and clamping device as described in claim 1, characterized in that, The two T-shaped top shafts (202) are configured with hexagonal pyramids at their close ends so as to connect with the printing rollers with hexagonal pyramidal grooves at both ends.

9. The cigarette packaging offset printing quick positioning and clamping device as described in claim 1, characterized in that, The two T-shaped top shafts (202) are provided with hexagonal conical grooves at their close ends to accommodate the printing rollers with hexagonal conical shaft ends.

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