A printing press

Abstract

The present application relates to the field of printing equipment, and discloses a printing machine, which comprises an ink tank, a plate roller, an ink blocking plate and an agitating mechanism, the ink blocking plate is installed at both ends of the plate roller, the ink blocking plate comprises an upper blocking plate and a lower blocking plate, the upper blocking plate is an upward-arched sheet, and the upper blocking plate covers the upper part of the plate roller; the lower blocking plate is a downward-arched sheet, and the lower blocking plate covers the lower part of the plate roller; the agitating mechanism is installed at the bottom of the ink tank, the agitating mechanism comprises a rotating rod and paddles, both ends of the rotating rod are rotationally connected with the inner wall of the ink tank, one end of the rotating rod that extends out of the ink tank is connected with the output end of a motor, the paddles are multiple, the multiple paddles are fixedly arranged on the rotating rod in a row, the rotating rod is multiple, and the multiple rotating rods are arranged at equal intervals at the bottom of the ink tank, and the rotating directions of the paddles are the same; the technical problem that the ink of the existing printing machine splashes seriously and cannot effectively block the splashed ink is solved.

Description

Technical Field

[0001] This invention relates to the field of printing equipment, and more specifically to a printing press. Background Technology

[0002] Gravure printing plays an important role in the packaging printing industry. During printing, ink is filled into the recesses, and then the ink adhering to the blank areas is scraped off with a doctor blade. The ink in the recesses is then transferred to the surface of the substrate under appropriate printing pressure.

[0003] For example, in the Chinese patent with authorization announcement number CN 215096414 U, a baffle is provided in the ink tank, which divides the ink tank into an ink supply tank and an overflow tank. The printing roller is located in the ink supply tank, and a leveling pipe is provided in the ink supply tank. The leveling pipe is provided with multiple discharge holes and is arranged in parallel behind the printing roller.

[0004] To ensure ink flowability, ink tanks are typically designed to be deep. However, in this type of printing press, ink flows into the supply tank from the leveling pipe and then overflows from the upper edge of the supply tank via the baffle, resulting in both the ink inlet and outlet being located in the upper layer of the ink tank. Furthermore, the printing roller only contacts the upper layer of ink during rotation. This prevents the printing roller from effectively stirring and mixing the lower layer of ink in the ink tank. The lower layer of ink is often denser due to the natural gravity separation of pigments. The printing roller only contacts the lighter upper layer of ink, exacerbating the separation phenomenon within the ink tank. Moreover, the splashing of the lighter upper layer of ink is intensified when it comes into contact with the high-speed rotating printing roller.

[0005] For example, the Chinese patent with authorization announcement number CN 218986108 U, in order to completely cover the other space between the ink tank and the printing roller to prevent splashing, its structure includes a scraper that contacts the end face of the printing roller, and one end of the scraper contacts the circumferential surface of the printing roller. The lower baffle is set inside the printing roller installation space and is located below the scraper, extending along the width direction of the ink tank body.

[0006] However, due to the effect of ink stratification, the upper layer of ink is lighter, and it is impossible to completely avoid splashing by simply scraping off the ink on the end face. The lighter ink moves rapidly to both sides under the pressure of the printing roller and splashes out along the circumferential edges of both sides of the printing roller, causing pollution to the production environment. Summary of the Invention

[0007] The present invention aims to provide a printing press to solve the technical problem of severe ink splattering and the inability to effectively block the splattered ink in existing printing presses.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a printing press, comprising an ink tank, a printing roller, an ink baffle, and an agitation mechanism, wherein the ink baffle is installed at both ends of the printing roller, and the ink baffle includes an upper baffle and a lower baffle, wherein the upper baffle is an upwardly arched thin sheet covering the upper part of the printing roller; and the lower baffle is a downwardly arched thin sheet covering the lower part of the printing roller;

[0009] The agitation mechanism is installed at the bottom of the ink tank. The agitation mechanism includes a rotating rod and blades. The two ends of the rotating rod are rotatably connected to the inner wall of the ink tank. One end of the rotating rod extending out of the ink tank is connected to the output end of a motor. There are multiple blades, which are arranged in a fixed row on the rotating rod. There are multiple rotating rods, which are arranged at equal intervals at the bottom of the ink tank. The blades rotate in the same direction.

[0010] The principle and advantages of this scheme are as follows: The rotation of the rotating rod driven by the motor drives the paddle to rotate, pushing the ink in the lower layer of the ink tank in the same direction; because the ink tank is equipped with a baffle separating the supply tank and the overflow tank, the upper part of the ink parallel to the printing roller flows towards the baffle, while the lower layer of ink in the ink tank flows away from the baffle as the stirring mechanism operates, so that the upper and lower layers form convection, allowing the ink in the area at the bottom of the baffle to be fully stirred. This accelerates the mixing of different layers of ink in the ink tank under a smooth state, which helps to reduce stratification and the possibility of sedimentation; it also ensures that the ink has a consistent consistency, avoiding the generation of light ink that causes severe ink splashing, and reducing the degree of ink splashing.

[0011] Furthermore, the ink baffle is divided into an upper baffle and a lower baffle, which cover the upper and lower parts of the printing roller respectively. This design can completely block ink splashing that may occur during the rotation of the printing roller. Both the upper and lower baffles adopt an arched thin sheet design, which can better fit the shape of the printing roller and improve the blocking effect. At the same time, the upper and lower baffles are located at the ends of the printing roller, completely wrapping the circumferential edges on both sides of the printing roller, thereby avoiding ink splashing.

[0012] Preferably, as an improvement, it further includes a doctor blade and a mounting plate for scraping off excess ink from the surface of the printing roller. The doctor blade is detachably fixed to the mounting plate, and the mounting plate has an extension surface extending toward the printing roller at one end near the doctor blade. The lower baffle is detachably fixed to the extension surface of the mounting plate, and the upper baffle is detachably fixed to the doctor blade. The mounting plate is fixedly mounted on a translation assembly for driving the ink baffle to move closer to the printing roller, and the translation assembly is fixedly mounted on a rotation assembly for driving the ink baffle to rotate closer to the printing roller.

[0013] The beneficial effects of this improvement are as follows: By using the mounting plate, the doctor blade and lower baffle can be installed and disassembled as independent modules, greatly simplifying the equipment maintenance and replacement process; when the doctor blade or ink baffle is worn or damaged, only the corresponding module needs to be replaced, without the need for a major overhaul of the entire ink baffle device, improving equipment maintenance efficiency and reducing maintenance costs; the extension surface of the mounting plate near the doctor blade end provides precise positioning for the installation of the lower baffle, ensuring the appropriate distance and angle between the ink baffle and the printing roller, further improving printing accuracy and stability; by rotating the assembly, the mounting plate can be flipped away from the ink tank, facilitating the disassembly and maintenance of the doctor blade and ink baffle, and the horizontal assembly can adjust the distance between the doctor blade and ink baffle and the printing roller. The combination of the two can more flexibly adapt to printing rollers at different positions and angles, and allows the ink baffle and doctor blade to be quickly moved aside without disassembly.

[0014] Preferably, as an improvement, the ink tank is rectangular, comprising short side walls on both sides and long side walls on both sides. An ink inlet is provided on the short side wall. A baffle is provided inside the ink tank, dividing the ink tank into a supply tank and an overflow tank. The end of the baffle near the ink outlet bends towards the printing roller to form a first guide section, and the end of the baffle away from the ink outlet bends away from the printing roller to form a second guide section. The wall of the first guide section is opposite to the ink inlet.

[0015] The beneficial effect of this improvement is that if the existing material feeding tube is used to feed ink into the ink tank, the installation of the mounting plate, doctor blade and other structures will block the top of the material feeding tube, affecting the operator's observation of the ink output of the material feeding tube. Since an overflow port needs to be set on one long side wall of the ink tank and a doctor blade and mounting plate need to be installed on the other long side wall, the ink inlet is set on the short side wall to make it easier for the operator to observe the ink outlet.

[0016] The two ends of the baffle are curved according to the ink flow characteristics of the corresponding areas. At the ink inlet, where the initial velocity is relatively high, the first guide part divides the ink in the ink inlet into two parts, which flow to the supply tank and the overflow tank respectively. The first guide part guides away part of the ink, reducing its velocity impact on the central area. In the tank wall area opposite to the ink inlets 1-3, ink is prone to accumulate. Therefore, a second guide part is designed to guide away the accumulated ink. This design makes the upper layer of ink in the ink tank and around the baffle form a ring-shaped fluid movement with a uniform velocity, so that the ink in the entire ink tank 1 flows slowly and steadily, improving the overall stability of the ink surface.

[0017] Preferably, as an improvement, in two blades located in the same row on adjacent rotating shafts, the blade of one blade can cut into the space between the blades of the other blade; the blades are helical, the blades on the same rotating shaft have the same helical direction, and the blades on adjacent rotating shafts have opposite helical directions.

[0018] The beneficial effects of this improvement are as follows: the staggered arrangement of the blades on adjacent rotating shafts in the same row avoids dead zones in the mixing, resulting in a more uniform distribution of pigments and fillers in the ink; the agitation mechanism reduces the frequency of cleaning the bottom of the ink tank, improving production efficiency; the spiral blade design can more effectively propel the ink axially within the supply tank, forming a more complex flow pattern, thereby further enhancing the mixing effect. The blades on the same rotating shaft have the same spiral direction, forming a unified rotational force field, while the blades on adjacent rotating shafts have opposite spiral directions, resulting in mutual interference and shearing action. This design produces a more intense mixing effect, making the ink more uniformly mixed; although the mixing effect is enhanced, the spiral blade design reduces direct shear damage to the ink, especially for inks containing pigment particles or other additives. This design protects the particle structure in the ink, preventing it from being damaged by excessive shearing.

[0019] Preferably, as an improvement, the ink baffle is detachably fixed to the mounting surface by a baffle fixing component. The baffle fixing component includes a bolt, a pressure plate, and a compression spring. The pressure plate has a through hole, and the mounting surface has an internal threaded hole. The bolt has a screw threadedly connected to the internal threaded hole of the mounting surface through the through hole of the pressure plate. The compression spring is wound around the screw of the bolt and is located between the head of the bolt and the pressure plate in a compressed state. One end of the ink baffle is clamped and fixed between the mounting surface and the pressure plate.

[0020] The beneficial effects of this improvement are as follows: Pulling the pressure plate closer to the head of the bolt compresses the clamping spring, increasing the distance between the pressure plate and the mounting surface. Placing one end of the ink baffle between the pressure plate and the mounting surface, releasing the pressure plate, and allowing the clamping spring to unfold, causes the pressure plate to press against the mounting surface again, fixing the ink baffle in place. When the ink baffle needs to be removed, it can be pulled outwards by external force, thus enabling the individual removal of the ink baffle.

[0021] The baffle fixing component makes the ink baffle easy to clean and maintain, improving equipment maintenance efficiency and speeding up the ink baffle replacement, reducing production losses caused by downtime for component replacement; the convenient disassembly also reduces the difficulty of maintenance personnel's work, which can be completed by ordinary workers, reducing maintenance costs; the pressure plate and mounting surface can clamp ink baffles of various thicknesses, which also improves the flexibility and adaptability of the equipment.

[0022] Preferably, as an improvement, the pressure plate includes an integrally formed pressure surface and a lifting part, one end of the lifting part is located in the middle section of the pressure surface, the pressure surface and the lifting part are T-shaped, and the end of the lifting part away from the pressure surface is raised in the direction away from the mounting surface.

[0023] The beneficial effects of this improvement are: the pressing surface and the lifting part are T-shaped, which makes it easier for the operator to hold the lifting part and move the pressing plate, making the operation more convenient; and the lifting part is raised so that there is a gap between the lifting part and the mounting surface, which makes it easier for the operator to hold.

[0024] Preferably, as an improvement, the bottom of the supply tank is provided with a filter port on the side away from the baffle, and the filter port is connected to a storage tank through a return pipe; the return pipe is provided with a valve and a filter tube, and the ink passes through the valve, the filter tube and the storage tank in sequence from the filter port; the filter tube is detachably installed on the return pipe, and a filter screen is snapped into the filter tube.

[0025] The beneficial effects of this improvement are as follows: the agitation mechanism sweeps the bottom sediment toward the filter port, and the operator periodically opens the valve to allow the ink containing impurities in the filter port to flow into the return pipe. After passing through the filter pipe, clumps, impurities, and other substances are intercepted, and the filtered ink enters the storage tank through the return pipe. After being agitated and filtered, it is pumped to the equalization pipe and returned to the ink tank for reuse. After the valve is closed, the filter pipe is disassembled to remove the clumps and impurities intercepted inside, and then reassembled for use. This improves the performance and efficiency of the ink circulation supply device.

[0026] Preferably, as an improvement, the distance between the first guide portion and the short side wall on the same side is less than the distance between the second guide portion and the short side wall on the same side.

[0027] The beneficial effects of this improvement are as follows: Since ink is a high-viscosity liquid, it is easier to form laminar flow rather than turbulent flow. The opening formed between the first guide section and the tank wall is small. Due to the narrow tube effect, the ink entering from the ink inlet will pass through the opening at a higher speed, reducing the velocity pressure at the ink inlet. The opening formed between the second guide section and the tank wall is larger. This is because the ink concentration at this point is higher (and the viscosity is also relatively high). Therefore, a larger opening is used to increase the flow rate per unit time.

[0028] Preferably, as an improvement, the top edge of the baffle is an arc shape that is high in the middle and low at both ends.

[0029] The beneficial effect of this improvement is that the ink flow around it is large and the concentration is low due to the initial speed of the ink entering. In the ink tank area opposite the ink inlet, the ink tends to accumulate after the initial speed of the ink decreases. Since the height of the existing baffle is the same at the front and back, the amount of ink overflowing from the high concentration area and the low concentration area is the same per unit time, resulting in uneven ink concentration in different areas over a long period of time.

[0030] The curved design of the baffle adjusts the overflow start time of different areas, causing the ink in the middle area to overflow later than the ink on both sides. Since both ends are overflowing, the ink flow in the middle area is slower than that at the ends, maintaining a relatively stable ink surface. When both ends and the middle area are overflowing, the overflow amount in the middle area per unit time is lower than that at the ends. This ensures that there is less lateral overflow in the middle area. Compared with the end areas, the flow rate in the middle area is slower, which can continue to maintain a relatively stable ink surface and ensure printing quality. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of an embodiment of the invention.

[0032] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0033] Figure 3 for Figure 1 A magnified view of a section at point B in the middle.

[0034] Figure 4 This is a schematic diagram of a structure where the mounting plate is in a vertical position.

[0035] Figure 5 This is a schematic diagram showing the structure with the mounting plate in a horizontal position.

[0036] Figure 6 This is a schematic diagram of the blade structure.

[0037] Figure 7 This is a schematic diagram of the filter tube.

[0038] Figure 8 This is a schematic diagram of the ink tank structure in this embodiment. Detailed Implementation

[0039] The following detailed description illustrates the specific implementation method:

[0040] The reference numerals in the accompanying drawings include: ink tank 1, printing roller 2, mounting plate 3, doctor blade 4, upper baffle 5, lower baffle 6, bolt 7, compression spring 8, pressure plate 9, fixed seat 10, fixed block 11, locking component 12, lead screw 13, lead screw seat 14, moving block 15, rotating shaft 16, base 17, baffle 18, storage tank 19, ink supply and purification device 20, uniform material pipe 21, return pipe 22, blade 23, brush bristles 24, filter port 25, valve 26, filter tube 27, semi-pipe body 28, rubber strip 29, bolt hole 30, filter mesh 31, long side tank wall 1-1, short side tank wall 1-2, ink inlet 1-3, first guide section 18-1 and second guide section 18-2.

[0041] Example 1

[0042] A printing press includes an ink circulation supply device and an ink blocking device.

[0043] The ink blocking device is installed on one side outside the ink tank 1 and acts on the printing roller 2; the ink circulation supply device is installed outside the ink tank 1 and communicates with the bottom of the ink tank 1.

[0044] As attached Figure 1 As shown, an ink circulation supply device includes an ink tank 1, a baffle 18, a storage tank 19, and an ink supply purification device 20 for providing pumping pressure and filtering fine particles in the ink. The ink tank 1 is rectangular, and the baffle 18 divides the ink tank 1 into a supply tank and an overflow tank. The height of the baffle 18 is lower than the depth of the ink tank 1.

[0045] The bottom of the overflow trough is provided with a return port, which is connected to the storage tank 19 through a return pipe 22. The printing roller is located in the supply trough, which is provided with a leveling pipe 21. The leveling pipe 21 is provided with multiple discharge holes and is arranged parallel to the rear of the printing roller 2. The outer port of the leveling pipe 21 is connected to the outlet of the ink supply purification device 20, and the inlet of the ink supply purification device 20 is connected to the storage tank 19 through a pipe. The ink supply purification device 20 includes a pneumatic diaphragm pump and an ink filter. The inlet of the pneumatic diaphragm pump is connected to the storage tank 19 through a pipe, and the outlet of the ink filter is connected to the leveling pipe 21 through a supply pipe.

[0046] The ink in the supply tank overflows from the baffle 18 to the overflow tank, and then enters the return pipe 22 through the return port, and then enters the storage tank 19 for temporary storage. The ink supply purification device 20, which is connected to the outlet of the storage tank 19, pumps the ink out of the storage tank 19. The ink supply purification device 20 presses the ink out of the outlet of the storage tank 19 and purifies the fine particles. Then, it flows through the pipe to the uniform material pipe 21. The multiple discharge holes on the uniform material pipe 21 then return the ink to the ink tank 1, realizing the circulation of ink.

[0047] As attached Figure 6 As shown, a stirring mechanism is provided at the bottom of the supply tank. The stirring mechanism includes a rotating rod and blades 23. The two ends of the rotating rod are rotatably connected to the inner wall of the supply tank. One end of the rotating rod extending out of the supply tank is connected to the output end of a motor. There are multiple blades 23, which are arranged in a fixed row on the rotating rod. There are multiple rotating rods. Along the direction of the feed equalization pipe 21 from the baffle 18, multiple rotating rods are arranged at equal intervals at the bottom of the supply tank. The blades 23 on the same row of adjacent rotating rods are staggered. The blade of one blade 23 can cut into the space between the blades of another blade 23, so that the stirring range of the blades 23 in the same row is continuous.

[0048] A sprocket is fixedly connected to one end of the rotating rod extending from the supply slot. Multiple sprockets on the rotating rods mesh with a chain to form a chain drive system, causing the blades 23 on the multiple rotating rods to rotate in the same direction and at the same frequency. The rotation of adjacent blades 23 in the same direction coordinates without interference. A drive motor is fixedly connected to the sprocket of one rotating rod, which drives the rotation of all blades 23. All sprockets and chains are mounted on the outer wall of the ink tank 1. The blades 23 are helical. The blades 23 on the same rotating rod have the same helical direction, while the blades 23 on adjacent rotating rods have opposite helical directions, causing the blades 23 on adjacent rotating rods to push the ink flow in opposite directions. The blades 23 have bristles 24 at their tips.

[0049] The drive motor is started, and the meshing transmission of the chain and sprockets enables all blades 23 to rotate in the same direction, pushing the lower layer of ink from the baffle 18 towards the uniform feed tube 21. Furthermore, the ink in adjacent rotating areas flows in an alternating manner, achieving mixing of the lower layer of ink. After the ink at the bottom of the baffle 18 is removed, the gap allows the upper layer of ink to fall, accelerating the mixing of the upper and lower layers of ink. The bristles 24 on the blades 23 contact and clean the bottom, inner wall, and corners of the ink tank 1, preventing the possibility of ink accumulation.

[0050] A filter port 25 is located at the bottom of the supply tank below the uniform feed pipe 21. The filter port 25 is connected to the storage tank 19 via the return pipe 22. The bottom of the overflow tank is constricted, and the area of ​​the supply tank located at the filter port 25 is also constricted. A valve 26 and a filter pipe 27 are provided on the return pipe 22. The ink passes through the valve 26, the filter pipe 27, and the storage tank 19 sequentially from the filter port 25. The filter pipe 27 is detachably installed on the return pipe 22, and a filter mesh 31 is snapped into the filter pipe 27. The return pipe 22, where the valve 26 and the filter pipe 27 are located, is a vertical pipe section.

[0051] The bristles 24 on the paddle 23 sweep fuel or impurity particles that cannot be re-integrated into the ink by stirring towards the filter port 25. The operator periodically opens the valve 26, allowing the ink containing impurities above the filter port 25 to flow into the return pipe 22. The impurity particles are intercepted on the filter screen 31, and the remaining normal ink enters the storage tank 19, passes through the ink supply purification device 20, and flows back to the ink tank 1 via the leveling pipe 21. After the filter screen 31 has been used for a period of time, with the valve 26 closed, the filter tube 27 is disassembled, and the filter screen 31 clipped inside the filter tube 27 is cleaned or replaced.

[0052] As attached Figure 7As shown, the filter tube 27 consists of two opposing semi-pipe bodies 28. The two mating ends of the semi-pipe bodies 28 are connected by hinges and bolts, respectively. The bolt fixing end is provided with bolt holes 30. The axial ends of the semi-pipe bodies 28 are wrapped around the return pipe 22, and each of the four ends of the semi-pipe bodies 28 is provided with rubber strips 29. The mating end faces of the two semi-pipe bodies 28 are sealed by the compression of two layers of rubber. The two ports connecting the return pipe 22 and the filter tube 27 are stepped outwards. The rubber strips 29 at the upper and lower ends of the semi-pipe bodies 28 are wrapped around the outward extension of the return pipe 22. The stepped shape causes the rubber strips 29 to deform, achieving a sealed and stable connection at the ports.

[0053] Unscrew the bolts on the two half-pipe bodies 28 through the bolt holes 30, allowing the two half-pipe bodies 28 to slightly unfold at the hinge point and then be removed from the return pipe 22. Next, remove the filter mesh 31 from the snap-fit ​​joint on the inner wall of the half-pipe body 28 for replacement and cleaning. The filter mesh 31 is made of nylon fiber or metal wire mesh. The snap-fit ​​joint of the filter mesh 31 has a certain degree of deformation capability, allowing the two half-pipe bodies 28 to still slightly unfold and be removed from the return pipe 22 when the filter mesh 31 is snapped onto the inner wall of the half-pipe body 28.

[0054] The storage tank 19 is horizontally positioned. The inlet of the storage tank 19 is located above one end of the storage tank 19, and the outlet of the storage tank 19 is located below the other end of the storage tank 19. The ink in the storage tank 19 flows horizontally from the inlet to the outlet. The circumferential outer wall of the storage tank 19 is provided with a heating layer, which is heated by an electric heating wire to heat the ink in the storage tank 19 to improve the fluidity of the ink.

[0055] An ink-blocking device is installed beside the ink tank 1 to prevent the high-speed rotating printing roller 2 inside the ink tank 1 from carrying ink out and splashing it around, causing contamination. The ink-blocking device includes a support mechanism and a baffle mechanism. The baffle mechanism is mounted on the adjustment mechanism, and the support mechanism is installed beside the ink tank 1.

[0056] The baffle mechanism includes a mounting plate 3, a doctor blade 4 for scraping off excess ink from the surface of the printing roller 2, an upper baffle 5, a lower baffle 6, and mounting components. The doctor blade 4 is detachably fixed to the mounting plate 3, and one end of the doctor blade 4 is in contact with the circumferential surface of the printing roller 2. The upper baffle 5 is an upwardly arched thin sheet located above the doctor blade 4, covering the upper part of the printing roller 2, and one end of the upper baffle 5 is detachably fixed to the doctor blade 4. The lower baffle 6 is a downwardly arched thin sheet located below the doctor blade 4, covering the lower part of the printing roller 2, and one end of the lower baffle 6 is detachably fixed to the mounting plate 3.

[0057] As attached Figure 2 and attached Figure 3As shown, the mounting assembly includes a baffle fixing component and a scraper 4 fixing component. The baffle fixing component includes a bolt 7, a pressure plate 9, and a compression spring 8. The upper baffle 5 and the lower baffle 6 are respectively mounted on the scraper 4 and the mounting plate 3 via the baffle fixing component. The pressure plate 9 includes an integrally formed pressure surface and a lifting part. The pressure surface is a long rectangular surface, and one end of the lifting part is located in the middle of the pressure surface. The pressure surface and the lifting part are T-shaped plates with raised tail ends. The pressure surface has a through hole, and the mounting surface has an internal threaded hole opposite to the pressure surface. The compression spring 8 is wound around the bolt 7. The bolt 7's threaded shaft passes through the through hole in the pressure surface and connects to the internal threaded hole in the mounting surface, fixing the pressure plate 9 to the mounting surface. The compression spring 8 is located between the head of the bolt 7 and the pressure plate 9, in a compressed state. The upper and lower baffles are located between the mounting surface and the pressure plate 9, clamping and fixing them. The operator holds the lifting part to move the pressure plate 9 outward along the axial direction of the bolt 7. The compression spring 8 continues to compress and increase the distance between the pressure plate 9 and the mounting surface, allowing the baffle to be pulled out. When the lifting part is released, the compression spring 8 presses against the pressure plate 9, causing the pressure plate 9 to return to a state of close contact with the mounting surface. The end of the lifting part away from the pressure surface tilts away from the mounting surface. Both ends of the pressure plate 9 are fixed to the mounting surface by two sets of bolts 7 and compression springs 8, respectively.

[0058] The mounting plate 3 has an extension surface near the end of the scraper 4 that extends toward the ink tank 1. Bolts 7 for mounting the lower baffle 6 fix the pressure plate 9 to the extension surface, and one end of the lower baffle 6 is clamped between the pressure plate 9 and the extension surface. Bolts 7 for mounting the upper baffle 5 fix the pressure plate 9 to the scraper 4, and one end of the upper baffle 5 is clamped between the pressure plate 9 and the scraper 4. The length of the pressure surface of the pressure plate 9 is greater than the width of the upper and lower baffles, increasing the range of adjustment available for the upper and lower baffles within the pressure plate 9.

[0059] The ink outlets in the ink tank 1 are located at both ends of the printing roller 2. Therefore, the lower baffle 6 and the upper baffle 5 are two separate pieces, which are installed at both ends of the printing roller 2.

[0060] As attached Figure 4As shown, the scraper 4 fixing component includes a fixing seat 10, a fixing block 11, and a locking member 12. The fixing seat 10 is rectangular and welded to the surface of the mounting plate 3. The upper surface of the fixing seat 10 has an internal threaded hole. The fixing block 11 is a three-sided folded plate with a front-low and rear-high shape. The rear end face is parallel to the front end face but is positioned relatively far back, forming a staggered parallel relationship. The front end face and the rear end face are connected by a folded surface, which is inclined at a certain angle to the horizontal plane. The front end face of the fixing block 11 is fixed to the scraper 4 by bolts. The rear end face of the fixing block 11 has a slotted hole, which is an open type hole. One side of the slotted hole is open without edges and directly connected to the edge of the rear end face. The locking member 12 is bolt-shaped, and the head of the locking member 12 is a disc-shaped part that is tangent to the rear end face of the fixing block 11. The threaded rod of the locking member 12 passes through the strip hole and is threaded into the internal threaded hole of the fixing seat 10, so that the rear end face of the fixing block 11 is clamped between the head of the locking member 12 and the fixing seat 10, thereby realizing the fixing of the mounting plate 3 and the scraper 4.

[0061] The scraper 4 is provided with four fixing blocks 11 at equal intervals, and the mounting plate 3 is provided with two fixing seats 10 and locking parts 12. Any two adjacent fixing blocks 11 on the scraper 4 can be assembled with the fixing seats 10 on the mounting plate 3 to realize the adjustment of the relative position of the scraper 4 and the mounting plate 3.

[0062] As attached Figure 5 As shown, the support mechanism includes a rotating assembly and a translating assembly. The translating assembly includes a lead screw 13, a lead screw seat 14, and a moving block 15. The lead screw 13 is rotatably mounted inside the lead screw seat 14. One end of the lead screw 13 is rotatably connected to the inner wall of the lead screw seat 14 via a bearing, and the other end of the lead screw 13 passes through the lead screw seat 14 and is provided with a turntable. The lead screw 13 is rotatably connected to the side wall of the lead screw seat 14 through which it passes via a bearing. The moving block 15 is threaded onto the lead screw 13. The moving block 15 is rectangular and moves axially along the lead screw 13 within the lead screw seat 14. The moving block 15 is fixedly welded to the mounting plate 3.

[0063] The rotating assembly includes a base 17 and a rotating shaft 16. The base 17 is located at both ends of the rotating shaft 16 and is rotatably connected by bearings. The lead screw seat 14 is fixedly welded to the rotating shaft 16. The output ends of servo motors are fixedly connected to the rotating shaft 16 and the lead screw 13 respectively to drive the rotation of the rotating shaft 16 and the lead screw 13.

[0064] The specific implementation process is as follows:

[0065] When the ink blocking device is adjusted and put into use, the mounting plate 3 is in a vertically upward position. Align the opening of the slot on the fixing block 11 of the doctor blade 4 with the locking member 12 and insert it. Rotate the locking member 12 to fix the doctor blade on the mounting plate 3. Then, pull up the pressure plate 9 on the extension to fix the lower baffle 6 on the mounting plate 3. Drive the rotating shaft 16 to rotate 90° so that the lower baffle 6 extends into the ink tank 1. Drive the lead screw 13 to rotate so that the mounting plate 3 moves closer to the printing roller 2 until the doctor blade 4 contacts the circumference of the printing roller 2. Then, pull up the pressure plate 9 on the doctor blade 4 to fix the upper baffle 5 on the doctor blade 4. This forms the upper baffle 5 and the lower baffle 6 covering the upper and lower parts of the printing roller 2, respectively.

[0066] As attached Figure 1 As shown, when the printing roller 2 is immersed in ink and rotates clockwise at high speed, the circumferential surface of the printing roller 2 presses against the ink surface, creating a shearing effect. This causes the ink to move rapidly to both sides under the pressure of the printing roller 2 and splash out along the circumferential edges of both sides of the printing roller 2, forming axial splashes at the ends of the printing roller 2. The splashed ink will contaminate the fabric to be dyed and the entire printing workshop.

[0067] The rotation of the ink roller 2 below the printing roller 2 creates a vortex, causing some ink to be carried out of the liquid surface with the rotation. The lower baffle 6 can block the formation of part of the vortex below the printing roller 2, reducing the ink splashed up with the rotation of the printing roller 2 and reducing the removal pressure on the doctor blade 4. Furthermore, the upper baffle 5 further blocks a small portion of the splashed ink, thus achieving complete ink blocking.

[0068] The upper baffle 5 and the lower baffle 6 are thin sheets of metal or polymer material, which gives them a certain degree of support and flexibility. Furthermore, within their elastic deformation range, the upper baffle 5 and the lower baffle 6 can return to their original shape after the external force is removed. The metal material can be aluminum alloy or stainless steel, and the polymer material can be polyurethane, etc.

[0069] Example 2

[0070] As attached Figure 8 As shown, the ink tank 1 includes short side walls 1-2 on both sides and long side walls 1-3 on both sides. To ensure that the outlet for conveying ink into the ink tank during the printing press operation is easily obstructed, the difference from Embodiment 1 is that the ink tank has ink inlet on one side of the short side wall 1-2, and an ink inlet 1-3 is provided on the short side wall. That is, the material distribution pipe arranged in parallel behind the printing roller in Embodiment 1 is replaced by ink inlet to convey ink into the ink tank; the cross section of the ink tank 1 along the short side is trapezoidal, and the bottom of the ink tank has several slots parallel to the long side walls. The baffle is vertically inserted into the slots and can be adjusted in position within the ink tank.

[0071] Because the initial velocity of the ink causes a large flow of ink around it, resulting in a low concentration, the ink pool area opposite the ink inlet tends to accumulate as the initial velocity of the ink decreases. Since the height of the existing baffle is the same both front and back, the amount of ink overflowing from the high-concentration area is the same as that from the low-concentration area per unit time, resulting in a long-term uneven ink concentration in different areas.

[0072] The baffle 18 is designed with an arc shape, higher in the middle and lower at both ends, and the upper top edge of the baffle 18 is symmetrical about its midline. The highest point of the middle part of the baffle 18 is 5cm lower than the upper edge of the ink tank 1, and the highest point of both ends of the baffle 18 is 10cm lower than the upper edge of the ink tank 1. That is, the height difference between the highest and lowest points of the upper top edge of the baffle 18 is 5cm.

[0073] This adjusts the overflow start time of different areas, so that the ink in the middle area starts overflowing later than the ink on both sides. Since both ends are overflowing, the ink flow in the middle area is slower than that at the ends, maintaining a relatively stable ink surface. When both ends and the middle area are overflowing, the overflow amount in the middle area per unit time is lower than that at the ends. This ensures that there is less lateral overflow in the middle area. Compared with the end areas, the flow rate in the middle area is slower, which can continue to maintain a relatively stable ink surface and ensure printing quality.

[0074] The baffle 18 has a notch in the middle, and a plug is connected to the notch; the baffle is a stainless steel baffle; when it is necessary to quickly dry the ink tank, the plug can be pulled out to increase the ink flow rate, and the stainless steel material can prevent it from reacting with the ink.

[0075] The baffle 18 is bent at the end near the ink outlet 1-3, that is, the right end of the baffle 18 is bent towards the printing roller 2 to form the first guide section 18-1. The plate wall of the first guide section 18-1 is opposite to the ink inlet 1-3. In this way, after the ink enters the ink tank 1 from the ink inlet 1-3, it is divided into two by the plate wall of the first guide section 18-2. One part enters the supply tank and the other part enters the overflow tank.

[0076] The end of the baffle 18 away from the ink outlet 1-3, that is, the left end of the baffle 18, is bent away from the printing roller 2 to form the second guide section 18-2. Thus, the first guide section 18-1 and the second guide section 18-2 are centrally symmetrical.

[0077] The distance between the second guide section 18-2 and the right short side channel wall 1-2 is 10cm, and the distance between the second guide section 18-2 and the left short side channel wall 1-2 is 20cm.

[0078] The two ends of the baffle 18 are curved according to the ink flow characteristics of the corresponding areas. In this way, due to the high initial velocity at the ink inlet 1-3, some ink is guided away by the first guide part 18-1, reducing its velocity impact on the central area. In the tank wall area opposite to the ink inlet 1-3, ink is prone to accumulating, so a second guide part 18-2 is designed to guide away the accumulated ink. This design makes the upper layer of ink in the ink tank 1 and around the baffle 18 form a ring-shaped fluid movement with a uniform velocity, so that the ink in the entire ink tank 1 flows slowly and steadily, improving the overall stability of the ink surface.

[0079] The distance between the first guide section 18-1 and the short side wall 1-2 on the same side is smaller than the distance between the second guide section 18-2 and the short side wall 1-2 on the same side. Since the ink is a high-viscosity liquid, it is more likely to form laminar flow rather than turbulent flow. The opening formed between the first guide section 18-1 and the wall is smaller. Due to the narrow tube effect, the ink entering from the ink inlet 1-3 will pass through the opening at a higher speed, reducing the velocity pressure at the ink inlet 1-3. The opening formed between the second guide section 18-2 and the wall is larger. This is because the ink concentration at this location is higher (and the viscosity is also relatively high). Therefore, a larger opening is used to increase the flow rate per unit time.

[0080] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A printing press, comprising an ink tank and a printing roller, characterized in that: It also includes an ink baffle and an agitation mechanism. The ink baffle is installed at both ends of the printing roller and includes an upper baffle and a lower baffle. The upper baffle is a thin sheet that arches upward and covers the upper part of the printing roller; the lower baffle is a thin sheet that arches downward and covers the lower part of the printing roller. The agitation mechanism is installed at the bottom of the ink tank and includes a rotating rod and blades. The two ends of the rotating rod are rotatably connected to the inner wall of the ink tank. One end of the rotating rod that extends out of the ink tank is connected to the output end of a motor. There are multiple blades, which are arranged in a fixed row on the rotating rod. There are multiple rotating rods, which are arranged at equal intervals at the bottom of the ink tank. The blades rotate in the same direction. It also includes a doctor blade and a mounting plate for scraping off excess ink from the surface of the printing roller. The doctor blade is detachably fixed to the mounting plate. The mounting plate has an extension surface extending toward the printing roller at one end near the doctor blade. The lower baffle is detachably fixed to the extension surface of the mounting plate. The upper baffle is detachably fixed to the doctor blade. The mounting plate is fixedly mounted on a translation assembly for driving the ink baffle to move closer to the printing roller. The translation assembly is fixedly mounted on a rotation assembly for driving the ink baffle to rotate closer to the printing roller. The ink tank is rectangular and includes two short side walls and two long side walls. An ink inlet is provided on the short side wall. A baffle is provided inside the ink tank, which divides the ink tank into a supply tank and an overflow tank. The end of the baffle near the ink inlet is bent towards the printing roller to form a first guide section, and the end of the baffle away from the ink inlet is bent away from the printing roller to form a second guide section. The wall of the first guide section is opposite to the ink inlet.

2. A printing machine according to claim 1, characterized in that: On adjacent rotating rods, among two blades in the same row, one blade can cut into the space between the blades of the other blade; the blades are helical, the blades on the same rotating rod have the same helical direction, and the blades on adjacent rotating rods have opposite helical directions.

3. A printing machine according to claim 2, characterized in that: The ink baffle is detachably fixed to the mounting surface by a baffle fixing component, which includes a bolt, a pressure plate, and a compression spring. The pressure plate has a through hole, and the mounting surface has an internal threaded hole. The bolt has a screw that passes through the through hole of the pressure plate and is threaded to the internal threaded hole of the mounting surface. The compression spring is wound around the screw of the bolt and is located between the head of the bolt and the pressure plate in a compressed state. One end of the ink baffle is clamped and fixed between the mounting surface and the pressure plate.

4. A printing press according to claim 3, characterized in that: The pressure plate includes an integrally formed pressure surface and a lifting part. One end of the lifting part is located in the middle section of the pressure surface. The pressure surface and the lifting part are T-shaped. The end of the lifting part away from the pressure surface is raised in the direction away from the mounting surface.

5. A printing press according to claim 4, characterized in that: The bottom of the supply tank is provided with a filter port on the side away from the baffle. The filter port is connected to a storage tank through a return pipe. The return pipe is provided with a valve and a filter tube. The ink passes through the valve, the filter tube and the storage tank in sequence from the filter port. The filter tube is detachably installed on the return pipe and a filter screen is snapped into the filter tube.

6. A printing press according to claim 5, characterized in that: The distance between the first flow guide and the short side wall on the same side is less than the distance between the second flow guide and the short side wall on the same side.

7. A printing press according to claim 6, characterized in that: The top edge of the baffle is arc-shaped, with a high middle and low ends.

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