Flexographic printing device

Abstract

The utility model discloses a kind of flexographic printing devices, it includes pedestal, anilox roll module and water-cooled impression roll module, anilox roll module includes main roll and locking fixing structure, locking fixing structure is by support seat, arc-shaped pressing block, rotary connecting rod and adjustable pull rod constitute.Water-cooled impression roll module includes roll body, water outlet connector, water inlet connector and cooling water pipe.The utility model has realized the quick clamping and accurate positioning of anilox roll, reduce the left and right pressure deviation caused by manual adjustment, enhanced the stability of connection.The structural design of water-cooled impression roll module makes that cooling water forms bidirectional flow path in roll body, expands effective heat exchange area and prolongs contact time, significantly improves heat dissipation efficiency.

Description

Technical Field

[0001] This utility model relates to a flexographic printing apparatus. Background Technology

[0002] With the rapid development of printing technology towards high speed, wide format, and multi-color printing, printing companies are constantly increasing their requirements for print accuracy, ink uniformity, and registration stability. In this process, temperature control of printing rollers (especially substrate rollers) and the rapid and reliable replacement of anilox rollers have become two core factors determining print quality and production efficiency.

[0003] On the one hand, printing rollers continuously heat up during high-speed operation due to frictional shearing between the roller surface and ink / paper, drying heat sources, and ambient heat radiation. To suppress this temperature rise, existing technologies commonly employ "water-cooled printing rollers": spiral or axially straight water channels are machined inside the roller body to carry away heat through circulating cooling water. However, this type of structure suffers from drawbacks such as insufficient heat exchange area, poor heat exchange effect due to short water flow paths and high flow rates, and uneven heat exchange.

[0004] On the other hand, as a core component for quantitative ink transfer, the anilox roller is replaced much more frequently than other rollers. Most existing anilox rollers employ a split bearing housing with bolt-locking structure. The disassembly process involves many steps—requiring the loosening and removal of multiple fastening bolts one by one before moving the bearing housing, which is time-consuming. Low repeatability accuracy - the pressure between the rollers needs to be readjusted after each clamping, and differences in human experience lead to uneven pressure on the left and right sides, affecting the consistency of ink volume. Poor connection stability - bolts are prone to loosening under long-term vibration and need to be retightened regularly, otherwise quality problems such as ink streaks and color differences will occur; These factors not only reduce roller changing efficiency, but also directly threaten the stability of printing quality.

[0005] In summary, existing technologies cannot simultaneously solve the two major problems of "low heat dissipation efficiency and lagging temperature control of the printing roller" and "cumbersome replacement and poor clamping accuracy of the anilox roller" within a compact space, leading to a decrease in printing yield and an increase in production costs. Therefore, the market urgently needs an integrated, easy-to-maintain, and highly efficient flexographic printing device to achieve precise temperature control of the printing roller and rapid and stable replacement of the anilox roller, thereby significantly improving printing quality and production efficiency. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the defects in the prior art and provide a flexographic printing device.

[0007] The present invention solves the above-mentioned technical problems through the following technical solution: A flexographic printing apparatus includes a base, and an anilox roller module and a water-cooled printing roller module mounted on the base. The anilox roller module includes a main roller and a locking and fixing structure disposed on the base for fixing the main roller; The locking and fixing structure includes a support base, an arc-shaped pressure block, a rotating connecting rod, and an adjustable pull rod; The support base includes a fixing part and an arc-shaped clamping arm, and one end of the clamping arm is provided with a mounting groove; One end of the arc-shaped pressure block is rotatably connected to the fixed part, and the other end is a free end, which is provided with a snap-fit ​​groove and a snap-fit ​​platform; One end of the rotating connecting rod is rotatably connected to the mounting groove and to the clamping arm, and the size of the rotating connecting rod is not greater than the size of the snap-fit ​​groove; The adjustable pull rod is adjustablely connected to the other end of the rotating link. The size of the adjustable pull rod is larger than the size of the snap-fit ​​groove. The pull rod is configured to pull the rotating link to rotate in a first direction to enter the snap-fit ​​groove. The connection length between the adjustable pull rod and the rotating link is adjustable so that the pull rod can abut against or disengage from the snap-fit ​​platform. The water-cooled printing roller module includes a roller body, a water outlet connector, a water inlet connector, and a cooling water pipe; The roller body includes a first end, a main body, and a second end connected in sequence. The first end, the main body, and the second end together form a cylindrical structure with a hollow cavity. The first end is provided with a through hole communicating with the hollow cavity. The water outlet connector is provided with an installation hole, one end of the water outlet connector is connected to the first end, the installation hole communicates with the through hole, and the water outlet connector is provided with a water outlet channel communicating with the installation hole; The water inlet connector is connected to the other end of the water outlet connector, and the water inlet connector is provided with a water inlet channel; The cooling water pipe passes through the mounting hole, the through hole, and the hollow cavity. The cooling water pipe includes a connecting section and a main pipe section. One end of the main pipe section is connected to the connecting section. The connecting section is seamlessly connected to the water outlet connector. A return water jacket is formed between the main pipe section, the water outlet connector, and the first end. The return water jacket is connected to the water outlet channel but not to the water inlet channel.

[0008] In some embodiments, one end of the adjustable pull rod is provided with an internal threaded groove, and the end of the rotating pull rod that is not connected to the clamping arm is provided with an external threaded connection part, which is inserted into the internal threaded groove to achieve a threaded connection.

[0009] In some embodiments, the other end of the adjustable rod is provided with a knurled nut.

[0010] In some embodiments, a printing roller that is locked by a hydraulic cylinder is also included.

[0011] In some embodiments, a cooling water tank communicating with the hollow cavity is provided on the second end, and the other end of the main pipe section is close to the cooling water tank.

[0012] In some embodiments, the first end portion includes a first conical surface and a first shaft; The first conical surface protrudes in a direction away from the hollow cavity, and the first conical surface is connected to one end of the main body. The first shaft is connected to one side of the first conical surface and extends in a direction away from the main body, and the through hole is provided in the first shaft; The second end includes a second conical surface and a second shaft; The second conical surface protrudes in a direction away from the hollow cavity, and the second conical surface is connected to the other end of the main body. The second shaft is connected to one side of the second conical surface and extends in a direction away from the main body, and the cooling water tank is disposed on the second shaft.

[0013] In some embodiments, the axes of the mounting hole, the through hole, the hollow cavity, and the cooling water tank coincide.

[0014] In some embodiments, the water-cooled printing roller module further includes: The first spacer is fixedly sleeved on the outer circumferential surface of the first shaft; A first bearing is fitted onto the first spacer, and the inner ring of the first bearing is connected to the first spacer. The second spacer is fixedly sleeved on the outer circumferential surface of the second shaft; The second bearing is fitted onto the second spacer, and the inner ring of the second bearing is connected to the second spacer.

[0015] In some embodiments, the first shaft is provided with a countersunk hole that communicates with the through hole, and one end of the water outlet connector is provided with a boss that matches the countersunk hole, and the boss is inserted into the countersunk hole.

[0016] In some embodiments, the water outlet connector is sleeved on the other end of the water outlet connector.

[0017] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0018] The significant advantages of this invention are as follows: It enables rapid clamping and precise positioning of the anilox roller, eliminates lateral pressure deviations caused by manual adjustments, and enhances connection stability. The structural design of the water-cooled printing roller module allows cooling water to form a bidirectional flow path within the roller body, expanding the effective heat exchange area and extending the contact time, thus significantly improving heat dissipation efficiency. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the water-cooled printing roller of this utility model.

[0020] Figure 2 This is a partial structural diagram of the water-cooled printing roller of this utility model.

[0021] Figure 3 This is a perspective view of the water-cooled printing roller of this utility model.

[0022] Figure 4 This is a rear view of the water-cooled printing roller of this utility model.

[0023] Figure 5 This is a perspective view of the locking and fixing structure of this utility model.

[0024] Figure 6 This is a cross-sectional view of the locking and fixing structure of this utility model.

[0025] Figure 7 This is a diagram showing the positions of the mounting groove, snap-fit ​​groove, and snap-fit ​​platform of the locking and fixing structure of this utility model.

[0026] Explanation of reference numerals in the attached figures: Roller 1 First end 11 First conical surface 111 First Axis 112 Through hole 1121 Main body 12 Second end 13 Second conical surface 131 Second axis 132 Cooling water tank 1321 Hollow chamber 14 Water outlet connector 2 Mounting hole 21 Water outlet channel 22 Water inlet connector 3 Water inlet channel 31 Cooling water pipe 4 Connecting segment 41 Supervisor Section 42 Return water jacket 5 First spacer 6 First bearing 7 Second spacer 8 Second bearing 9 Support base 100 Fixing part 101 Arms 102 Mounting slot 1021 110 arc-shaped pressure block Card slot 1101 Card receiving platform 1102 Rotating connecting rod 120 Adjustable pull rod 130 140 knurled nuts Internal thread groove 150 External threaded connection part 160 Detailed Implementation The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0027] It should be noted that in the claims and specification of this patent, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0028] like Figures 1-7As shown, this application discloses a flexographic printing apparatus, including a base, an anilox roller module, and a water-cooled printing roller module. The anilox roller module includes a main roller and a locking and fixing structure, which consists of a support base 100, an arc-shaped pressure block 110, a rotating connecting rod 120, and an adjustable pull rod 130. The support base 100 includes a fixing part 101 and an arc-shaped clamping arm 102 with a mounting groove 1021. One end of the arc-shaped pressure block 110 is rotatably connected to the fixing part 101, and the free end is provided with a snap-fit ​​groove 1101 and a snap-fit ​​platform 1102. One end of the rotating connecting rod 120 is rotatably connected to the mounting groove 1021 of the clamping arm 102, and the adjustable pull rod 130 is connected to the other end of the rotating connecting rod 120. The adjustable pull rod 130 is larger than the locking slot 1101. The pull rod is configured to pull the rotating connecting rod 120 in a first direction to enter the locking slot 1101, thereby further locking the adjustable pull rod 130 onto the locking platform 1102. When the adjustable pull rod 130 is unlocked from the locking platform 1102, it can also pull the rotating connecting rod 120 in the opposite direction to disengage from the locking slot 1101. The connection length between the adjustable pull rod 130 and the rotating connecting rod 120 is adjustable, allowing the pull rod to abut or disengage from the locking platform 1102.

[0029] The support base 100 refers to the fixed base that bears the axial load of the main roller. The fixing part 101 can be connected to the base with bolts. The arc-shaped contour of the clamping arm 102 matches the local outer diameter of the main roller to achieve radial positioning. The arc-shaped pressure block 110 refers to the arc-shaped component that covers a part of the outer circumference of the main roller. Its rotating connection end can be equipped with a hinge pin. The width of the locking groove 1101 is slightly larger than the cross-sectional dimension of the rotating connecting rod 120 to achieve quick locking. The rotating connecting rod 120 refers to the rigid rod that transmits the force of the tension rod.

[0030] Compared to existing technologies, traditional anilox roller locking requires tightening and loosening bolts one by one and adjusting the bearing seat position. This solution can complete the locking and releasing of the clamping arm 102 with a single rotation of the pull rod, shortening the operation time. Traditional split-type locking structures have the risk of bolt loosening, while the self-locking pull rod mechanism of this solution maintains stable clamping force under vibration conditions.

[0031] Through the above technical solution, this application achieves rapid clamping and precise positioning of the anilox roller, reduces left and right pressure deviation caused by manual adjustment, and enhances the stability of the connection.

[0032] The water-cooled printing roller module includes a roller body 1, a water outlet connector 2, a water inlet connector 3, and a cooling water pipe 4.

[0033] The roller body 1 includes a first end 11, a main body 12, and a second end 13 connected in sequence. The first end 11, the main body 12, and the second end 13 together form a cylindrical structure with a hollow cavity 14. The first end 11 is provided with a through hole 1121 that communicates with the hollow cavity 14.

[0034] The water outlet connector 2 is provided with an installation hole 21. One end of the water outlet connector 2 is connected to the first end 11. The installation hole 21 is connected to the through hole 1121. The water outlet connector 2 is provided with a water outlet channel 22 that is connected to the installation hole 21.

[0035] The inlet connector 3 is connected to the other end of the outlet connector 2, and the inlet connector 3 is provided with an inlet channel 31.

[0036] Cooling water pipe 4 passes through mounting hole 21, through hole 1121 and hollow cavity 14. Cooling water pipe 4 includes connecting section 41 and main pipe section 42. One end of main pipe section 42 is connected to connecting section 41. Connecting section 41 is seamlessly connected to water outlet connector 2. A return water jacket 5 is formed between main pipe section 42, water outlet connector 2 and first end 11. The return water jacket 5 is connected to water outlet channel 22 but not to water inlet channel 31.

[0037] The cylindrical hollow chamber 14 refers to the columnar cavity formed by the three sections of the roller body 1, which can be achieved by segmented casting followed by welding or by integral die casting. The return water jacket 5 refers to the annular gap formed by the outer wall of the cooling water pipe 4, the inner wall of the mounting hole 21, and the inner wall of the through hole 1121; that is, the return water jacket 5 is composed of a portion of the through hole 1121 and a portion of the mounting hole 21. Seamless connection refers to the airtight connection between the connecting section 41 and the water outlet connector 2, preventing leakage.

[0038] Through the above technical solution, this application optimizes the structural design of the water-cooled printing roller and improves the heat exchange efficiency between the cooling water and the roller body 1. The roller body 1 adopts a cylindrical hollow chamber 14 structure composed of a first end 11, a main body 12, and a second end 13, which increases the contact area between the cooling water and the inner wall of the roller body 1. At the same time, the connection between the hole 1121 and the mounting hole 21 forms a cooling water circulation path. The separate connection between the water outlet connector 2 and the water inlet connector 3 realizes the separation of the input and output of cooling water, avoiding short circuit of water flow. The main pipe section 42 of the cooling water pipe 4 extends into the hollow chamber 14, and its connecting section 41 is seamlessly connected to the water outlet connector 2 to ensure sealing. The return water jacket 5 between the main pipe section 42, the water outlet connector 2, and the first end 11 forms a meandering water flow channel, which prolongs the flow path and residence time of the cooling water in the roller body 1, thereby improving the heat exchange efficiency. The design of the return water jacket 5 being connected to the water outlet channel 22 and independent of the water inlet channel 31 allows the cooling water to flow in one direction and fully absorb the heat of the roller body 1 before being discharged, thus avoiding the reduction in heat dissipation efficiency caused by the mixing of hot and cold water.

[0039] Furthermore, this application proposes that one end of the adjustable pull rod 130 is provided with an internal thread groove 150, and the other end of the rotating pull rod that is not connected to the clamping arm 102 is provided with an external thread connection part 160, and the external thread connection part 160 is inserted into the internal thread groove 150 to achieve threaded connection.

[0040] The internal thread groove 150 refers to a hole structure with a helical groove machined at the end of the adjustable pull rod 130, used to form an adjustable helical fit with the external thread. The external thread connection part 160 refers to a cylindrical structure with a helical protrusion machined at the end of the rotating pull rod, whose outer diameter dimension forms a clearance fit with the inner diameter dimension of the internal thread groove 150, and axial displacement adjustment is achieved through thread engagement.

[0041] Specifically, when the main roller needs to be locked, the depth to which the external threaded connection 160 is screwed into the internal threaded groove 150 is controlled by rotating the adjustable pull rod 130, so that the rotating connecting rod 120 forms contact pressure with the locking platform 1102 of the arc-shaped pressure block 110. The axial tension generated by the thread engagement drives the rotating connecting rod 120 to rotate around the axis of the mounting groove 1021, so that the end of the adjustable pull rod 130 abuts against the surface of the locking platform 1102. The self-locking characteristic of the threaded pair ensures that the connection length remains stable under vibration, without the need for additional anti-loosening measures. When disassembly is required, rotating the adjustable pull rod 130 in the opposite direction causes the external threaded connection 160 to exit the internal threaded groove 150, releasing the contact pressure between the rotating connecting rod 120 and the locking platform 1102.

[0042] Through the above technical solution, this application achieves stepless adjustment of axial tension during the locking process of the anilox roller, avoiding the repeated disassembly and assembly operations required by traditional bolt locking, and shortening the roller changing time. The continuous meshing characteristics of the threaded pair make the contact pressure distribution between the rotating connecting rod 120 and the clamping platform 1102 more uniform, reducing the left and right pressure deviation caused by manual adjustment and improving the accuracy of repeated clamping. The integrated design of the threaded connection reduces the number of parts, simplifies the assembly process, and enhances the vibration resistance.

[0043] This application further proposes to provide a knurled nut 140 at the end of the adjustable pull rod 130.

[0044] Among them, the knurled nut 140 refers to a fastener with anti-slip texture on its surface. The knurling increases the friction of the contact surface. This structure creates an anti-slip effect through the contact between the texture and the operator's hand, making it possible to rotate and adjust by hand while avoiding interference from tool operation in a confined space.

[0045] Specifically, the knurled nut 140 directly engages with the threaded end of the adjustable pull rod 130, allowing manual rotation to adjust the rod's connection length. When locking the main roller, the operator rotates the knurled nut 140 to move the pull rod along the threaded direction, thereby controlling the contact state between the rotating connecting rod 120 and the locking platform 1102. The knurled pattern provides sufficient frictional resistance during rotation, preventing adjustment deviations caused by hand slippage and ensuring uniform transmission of locking force. In the unlocked state, rotating the knurled nut 140 in the opposite direction quickly releases the pull rod's constraint on the rotating connecting rod 120, enabling rapid disassembly of the main roller.

[0046] Through the above technical solution, this application solves the problem of uneven locking force caused by slippage during manual adjustment, realizes tool-free rapid operation, and ensures the repeatability and positioning accuracy of anilox roller clamping within the compact space of printing equipment.

[0047] This application further proposes a printing roller that is locked by a hydraulic cylinder.

[0048] Among them, the hydraulic cylinder refers to the power element that uses hydraulic oil as the working medium to achieve linear reciprocating motion. Specifically, a double-acting hydraulic cylinder can be used, and the extension and retraction of its piston rod is controlled by the hydraulic system.

[0049] By using the above technical solution, compared with the traditional method of controlling the locking of the printing roller by a cylinder, this application improves the control accuracy by using a hydraulic cylinder.

[0050] Furthermore, this application proposes that a cooling water tank 1321 communicating with the hollow cavity 14 is provided on the second end 13, and the other end of the main pipe section 42 is close to the cooling water tank 1321.

[0051] The cooling water tank 1321 refers to a groove structure located at the second end 13 and connected to the hollow cavity 14. Specifically, it can be implemented as an annular groove, a spiral groove, or an axial straight groove. Its function is to increase the contact area between the cooling water and the second end 13. The main pipe section 42 near the cooling water tank 1321 refers to the end of the cooling water pipe 4 extending to the vicinity of the cooling water tank 1321. This can be achieved by adjusting the length or bending angle of the cooling water pipe 4. Its function is to guide the cooling water flow towards the cooling water tank 1321, forming a local circulation.

[0052] Compared with existing technologies, the cooling water of traditional water-cooled printing rollers only flows through the hollow cavity 14 of the main body 12, which cannot effectively dissipate heat to the second end 13, resulting in a temperature gradient between the second end 13 and the main body 12. This solution adds a cooling water tank 1321 to the second end 13, allowing the cooling water to act directly on this area, eliminating local heat accumulation, and thus improving the uniformity of the overall temperature distribution of the roller body 1.

[0053] Through the above technical solution, this application achieves efficient heat dissipation of the second end 13, avoiding premature failure of components such as bearings or bushings installed there due to excessive temperature in this area, and ensuring stable operation of the roller body 1 under continuous high load conditions.

[0054] Furthermore, this application proposes that the first end portion 11 includes a first conical surface 111 and a first shaft 112. The first conical surface 111 protrudes in a direction away from the hollow cavity 14 and is connected to one end of the main body portion 12; the first shaft 112 is connected to one side of the first conical surface 111 and extends in a direction away from the main body portion 12.

[0055] The first conical surface 111 refers to the transition area where the end connects to the main body 12. Its protrusion direction is opposite to that of the hollow cavity 14. Specifically, it can be implemented using a conical surface structure with a taper of 5°-15°. This structure enhances the connection strength between the end and the main body 12 by increasing the contact area. The first shaft 112 refers to the cylindrical support structure extending from the first conical surface 111. Specifically, it can be implemented using a circular shaft structure coaxial with the main body 12. This structure provides a precise assembly reference for the sealing assembly and bearings.

[0056] Through the above technical solutions, this application solves the problem of insufficient mechanical stability caused by stress concentration in the end structure. The conical structure improves the heat exchange efficiency between the cooling medium and the roller 1. The independent extension design of the first shaft 112 ensures the assembly accuracy of the rotating support component and reduces the impact of running vibration on printing quality.

[0057] Furthermore, this application proposes that the second end portion 13 includes a second conical surface 131 and a second shaft 132. The second conical surface 131 protrudes in a direction away from the hollow cavity 14 and is connected to the other end of the main body portion 12. The second shaft 132 is connected to one side of the second conical surface 131 and extends in a direction away from the main body portion 12, and a cooling water tank is disposed on the second shaft 132.

[0058] The structure and implementation of the second conical surface 131 and the second shaft 132 are the same as those of the first conical surface 111 and the first shaft 112. The independent setting of the cooling water tank on the second shaft 132 can achieve efficient heat dissipation of the second shaft 132, avoid premature failure of components such as bearings or bushings installed there due to excessive temperature in this area, and ensure the stable operation of the roller body 1 under continuous high load conditions.

[0059] Furthermore, this application proposes that the axes of the mounting hole 21, the through hole 1121, the hollow cavity 14, and the cooling water tank 1321 coincide.

[0060] This technical solution achieves geometric consistency in the cooling water flow path by setting the axes of the mounting hole 21, through hole 1121, hollow cavity 14, and cooling water tank 1321 to a coaxial structure. The coincident axes ensure that after entering from the inlet connector 3, the cooling water flows along a single axis through all the internal chambers of the roller body 1, avoiding sudden changes in local resistance and turbulent energy loss caused by misalignment of the channels. Furthermore, the coincident axis structure guarantees the alignment accuracy between the cooling water tank 1321 and the cooling water pipe 4, allowing the cooling water to diffuse evenly into the cooling water tank at the end.

[0061] Furthermore, this application proposes to also include a first spacer 6, a first bearing 7, a second spacer 8, and a second bearing 9.

[0062] The first spacer 6 is fixedly sleeved on the outer circumferential surface of the first shaft 112; the first bearing 7 is sleeved on the first spacer 6, and the inner ring of the first bearing 7 is connected to the first spacer 6. The second spacer 8 is fixedly sleeved on the outer circumferential surface of the second shaft 132; the second bearing 9 is sleeved on the second spacer 8, and the inner ring of the second bearing 9 is connected to the second spacer 8.

[0063] The first spacer 6 refers to an annular transition component disposed on the outer surface of the first shaft 112, which can be fixed to the first shaft 112 by interference fit or key connection. The second spacer 8 refers to an annular transition component disposed on the outer surface of the second shaft 132, which can be fixed to the second shaft 132 by interference fit or key connection.

[0064] Through the above technical solution, this application solves the problem of frictional loss caused by direct contact between the bearing and the shaft, reduces the risk of bearing jamming caused by improper fit clearance, simplifies the bearing installation and maintenance process, and reduces the impact of operating vibration on the shaft structure.

[0065] Furthermore, this application proposes that the first shaft 112 is provided with a countersunk hole communicating with the through hole 1121, and one end of the water outlet connector 2 is provided with a boss that matches the countersunk hole, and the boss is inserted into the countersunk hole.

[0066] The countersunk hole refers to a stepped hole structure located on the end face of the first shaft 112 with a diameter larger than that of the through hole 1121. It can be achieved by drilling or milling. Its function is to provide axial positioning space for the boss and form a sealing contact surface. The boss refers to a cylindrical structure extending outward from the end of the water connector 2. It can be achieved by turning or casting. Its function is to form a geometric matching relationship with the countersunk hole to achieve radial sealing.

[0067] Through the above technical solution, the countersunk hole and the through hole 1121 are connected to form a cooling water flow path. After the boss is inserted into the countersunk hole, the contact surfaces of the two form a radial seal through interference fit or clearance control, preventing cooling water leakage along the axial direction. The insertion assembly method of the boss and the countersunk hole also limits the radial offset of the water outlet connector 2, ensuring connection stability. During the assembly process, the stepped structure of the countersunk hole can accommodate the assembly tolerance between the end face of the boss and the bottom of the hole, reducing the requirements for machining accuracy.

[0068] Furthermore, this application proposes that the water outlet connector 2 be fitted onto the other end of the water outlet connector 2.

[0069] The "outlet connector 2" refers to the nested connection structure formed at the end of the outlet connector 2. This can be achieved through interference fit or sealing ring compression. This structure achieves axial sealing by increasing the contact area. The nested connection structure refers to the formation of a closed annular gap using mechanical fit. This can be achieved through a stepped shaft and bushing fit. This structure prevents wear on the sealing surface by eliminating the intrusion path of external impurities.

[0070] In some specific embodiments, the stepped shaft end can be machined with a guide chamfer to facilitate assembly, and the inner wall of the bushing can be coated with polytetrafluoroethylene to reduce the coefficient of friction. The sealing ring material can be fluororubber to withstand high-temperature cooling media, and the sealing groove cross-sectional shape can be designed as trapezoidal to enhance its resistance to compression. Through the above technical solutions, this application effectively prevents the leakage of cooling water at the joint connection.

[0071] This application also proposes a flexographic printing press, which includes the water-cooled printing roller described above.

Claims

1. A flexographic printing apparatus, characterized in that, Includes a base, and an anilox roller module and a water-cooled printing roller module mounted on the base; The anilox roller module includes a main roller and a locking and fixing structure disposed on the base for fixing the main roller; The locking and fixing structure includes a support base, an arc-shaped pressure block, a rotating connecting rod, and an adjustable pull rod; The support base includes a fixing part and an arc-shaped clamping arm, and one end of the clamping arm is provided with a mounting groove; One end of the arc-shaped pressure block is rotatably connected to the fixed part, and the other end is a free end, which is provided with a snap-fit ​​groove and a snap-fit ​​platform; One end of the rotating connecting rod is rotatably connected to the mounting groove and to the clamping arm, and the size of the rotating connecting rod is not greater than the size of the snap-fit ​​groove; The adjustable pull rod is adjustablely connected to the other end of the rotating link. The size of the adjustable pull rod is larger than the size of the snap-fit ​​groove. The pull rod is configured to pull the rotating link to rotate in a first direction to enter the snap-fit ​​groove. The connection length between the adjustable pull rod and the rotating link is adjustable so that the pull rod can abut against or disengage from the snap-fit ​​platform. The water-cooled printing roller module includes a roller body, a water outlet connector, a water inlet connector, and a cooling water pipe; The roller body includes a first end, a main body, and a second end connected in sequence. The first end, the main body, and the second end together form a cylindrical structure with a hollow cavity. The first end is provided with a through hole communicating with the hollow cavity. The water outlet connector is provided with an installation hole, one end of the water outlet connector is connected to the first end, the installation hole communicates with the through hole, and the water outlet connector is provided with a water outlet channel communicating with the installation hole; The water inlet connector is connected to the other end of the water outlet connector, and the water inlet connector is provided with a water inlet channel; The cooling water pipe passes through the mounting hole, the through hole, and the hollow cavity. The cooling water pipe includes a connecting section and a main pipe section. One end of the main pipe section is connected to the connecting section. The connecting section is seamlessly connected to the water outlet connector. A return water jacket is formed between the main pipe section, the water outlet connector, and the first end. The return water jacket is connected to the water outlet channel but not to the water inlet channel.

2. The flexographic printing apparatus as described in claim 1, wherein one end of the adjustable pull rod is provided with an internal threaded groove, and the end of the rotating pull rod not connected to the clamping arm is provided with an external threaded connection part, wherein the external threaded connection part is inserted into the internal threaded groove to achieve a threaded connection.

3. The flexographic printing apparatus as described in claim 2, wherein the other end of the adjustable pull rod is provided with a knurled nut.

4. The flexographic printing apparatus as described in claim 1, characterized in that, It also includes printing rollers that are locked by hydraulic cylinders.

5. The flexographic printing apparatus as described in claim 1, characterized in that, A cooling water tank communicating with the hollow cavity is provided on the second end, and the other end of the main pipe section is close to the cooling water tank.

6. The flexographic printing apparatus as described in claim 5, characterized in that, The first end portion includes a first conical surface and a first shaft; The first conical surface protrudes in a direction away from the hollow cavity, and the first conical surface is connected to one end of the main body. The first shaft is connected to one side of the first conical surface and extends in a direction away from the main body, and the through hole is provided in the first shaft; The second end includes a second conical surface and a second shaft; The second conical surface protrudes in a direction away from the hollow cavity, and the second conical surface is connected to the other end of the main body. The second shaft is connected to one side of the second conical surface and extends in a direction away from the main body, and the cooling water tank is disposed on the second shaft.

7. The flexographic printing apparatus as described in claim 6, characterized in that, The axes of the mounting hole, the through hole, the hollow cavity, and the cooling water tank coincide.

8. The flexographic printing apparatus as described in claim 6, characterized in that, The water-cooled printing roller module also includes: The first spacer is fixedly sleeved on the outer circumferential surface of the first shaft; A first bearing is fitted onto the first spacer, and the inner ring of the first bearing is connected to the first spacer. The second spacer is fixedly sleeved on the outer circumferential surface of the second shaft; The second bearing is fitted onto the second spacer, and the inner ring of the second bearing is connected to the second spacer.

9. The flexographic printing apparatus as described in claim 6, characterized in that, The first shaft has a countersunk hole that communicates with the through hole, and one end of the water outlet connector has a boss that matches the countersunk hole, and the boss is inserted into the countersunk hole.

10. The flexographic printing apparatus as claimed in claim 6, characterized in that, The water outlet connector is fitted onto the other end of the water outlet connector.

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