Ink constant temperature circulation filtering mechanism, printing device and printing process of decorative paper

Abstract

The application relates to an ink constant-temperature circulation filtering mechanism, a printing device and a printing process of decorative paper, relates to the ink filtering technical field, and comprises an oil groove, a circulating pump, an inlet pipe, a discharge pipe, arc-shaped shunt pipes, a converging cylinder, a triangular prism frame, an angle control assembly and two filter screens, the triangular prism frame is located in the converging cylinder, three side edges of the triangular prism frame abut against the inner wall surface of the converging cylinder, the two filter screens are arranged on two side faces of the triangular prism frame respectively, and the two filter screens are arranged correspondingly to the ports of the two shunt pipes; the two shunt pipes are provided with fluid conveying assemblies, and the angle control assembly drives the triangular prism frame to rotate around the shaft center of the converging cylinder, so as to control the angle between the filter screens and the shaft center of the shunt pipes. The application has the effect of reducing the disassembly and maintenance frequency of the filter screens.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printing equipment, in particular to an ink constant-temperature circulation filtering mechanism, a printing device and a printing process of decorative paper. BACKGROUND

[0002] Decorative paper is an essential raw material for many building material products, such as low-pressure boards, high-pressure boards, fireproof boards and floor boards used in furniture and cabinets. In the product structure, decorative paper mainly plays a decorative role of providing patterns and a covering role of preventing the seepage of the bottom glue solution.

[0003] In the production process of decorative paper, a printing device is often used to print decorative paper. The printing device includes a printing machine body and an ink constant-temperature circulation mechanism. The ink constant-temperature circulation mechanism is mainly used for circulating ink to help the uniform distribution of pigments, solvents and additives in the ink, prevent sedimentation or stratification, ensure the consistency and stability of the printing color, speed up the updating speed of the ink, ensure that the ink is in a good state, and also maintain the uniformity of the temperature of the ink.

[0004] During the production and storage process or the use process of the ink, the ink may contain some impurities such as dust, metal chips and other particles. Therefore, a filter screen is often arranged in the ink constant-temperature circulation mechanism to filter the impurities.

[0005] However, when the filter screen is blocked, it is necessary to stop the machine and disassemble the filter screen, which is relatively cumbersome. If the filter screen is frequently blocked, the frequency of disassembly and installation is relatively high. SUMMARY

[0006] In order to reduce the frequency of disassembly and maintenance of the filter screen, the present application provides an ink constant-temperature circulation filtering mechanism, a printing device and a printing process of decorative paper.

[0007] The ink constant-temperature circulation filtering mechanism provided by the present application adopts the following technical scheme:

[0008] The application discloses an ink constant-temperature circulation filtering mechanism which comprises an oil groove, a circulating pump, an inlet pipe, an outlet pipe, arc-shaped shunt pipes, a converging cylinder, a triangular prism frame, an angle control assembly and two filter screens, and a heating structure is arranged in the oil groove, one end of the inlet pipe and the outlet pipe is communicated with two sides of the oil groove respectively, the two shunt pipes are arranged side by side, one end of the two shunt pipes is communicated with the outlet end of the inlet pipe, three openings are arranged through the outer circumferential surface of the converging cylinder, and the three openings are communicated with the end of the outlet pipe and the end of the two shunt pipes respectively; the triangular prism frame is located in the converging cylinder, the three side edges of the triangular prism frame abut against the inner circumferential surface of the converging cylinder, the two filter screens are arranged on two side faces of the triangular prism frame respectively, and the two filter screens are arranged correspondingly to the ports of the two shunt pipes; the inlet pipe is provided with a first on-off valve, the two shunt pipes are provided with fluid conveying assemblies respectively, and the outlet pipe is provided with a second on-off valve; the angle control assembly drives the triangular prism frame to rotate around the axis of the converging cylinder, so as to control the angle between the filter screens and the axis of the shunt pipe; one of the filter screens is arranged as a first screen body, and the other filter screen is arranged as a second screen body; when the triangular prism frame is located at a first station, the surfaces of the two filter screens are perpendicular to the axes of the corresponding shunt pipes respectively; when the triangular prism frame is located at a second station, the included angle between the first screen body and the axis of the shunt pipe is 100-130 degrees; and when the triangular prism frame is located at a third station, the included angle between the second screen body and the axis of the shunt pipe is 100-130 degrees.

[0009] By adopting the technical scheme, when the triangular prism frame is located at the first station, the circulating pump is started to drive the ink to move along the path of the oil groove, the inlet pipe, the shunt pipe, the converging cylinder, the outlet pipe and the oil groove; in the process, the filter screen intercepts impurities in the ink.

[0010] When the impurities clogging the filter screen need to be cleaned, the circulating pump is closed, the first on-off valve and the second on-off valve are closed, so that the two shunt pipes and the converging cylinder form a closed loop flow channel, the angle control assembly moves the triangular prism frame to the second station and the third station in sequence, one of the fluid conveying assemblies is started (the other fluid conveying assembly is not started) in the process that the triangular prism frame is moved from the first station to the second station, the ink in the closed loop flow channel flows unidirectionally, the ink passes through the first screen body and the second screen body in sequence, when the ink passes through the second screen body, the ink back-flushes the impurities on the second screen body and carries the impurities to the first screen body along the shunt pipe, since the included angle between the first screen body and the axis of the shunt pipe is 100-130 degrees, part of the ink carrying the impurities moves along the inclined surface of the first screen body, and the impurities carried by the ink gradually gather at the included angle between the first screen body and the inner circumferential surface of the converging cylinder.

[0011] During the movement of the three-prism frame from the first station to the third station, one of the fluid conveying assemblies is started (the other fluid conveying assembly is not started), and the ink in the closed loop flow channel flows in one direction, and the ink passes through the second screen body and the first screen body in sequence, when the ink passes through the first screen body, the ink backflushes the impurities on the first screen body and carries the impurities to the second screen body along the shunt pipe, because the included angle between the second screen body and the axis of the shunt pipe is 100-130 degrees, therefore, part of the ink carrying the impurities will move along the inclined surface of the second screen body, and the impurities carried by the ink gradually gather at the included angle between the second screen body and the inner circumferential surface of the flow collecting cylinder.

[0012] In this way, not only the two filter screens are unblocked, but also the impurities are gathered and collected, so as to reduce the secondary blocking of the filter screen by the impurities, thereby greatly reducing the disassembly and maintenance frequency of the filter screen.

[0013] In addition, during the movement of the three-prism frame from the first station to the second station and the third station, the included angle of the filter screen relative to the axis of the shunt pipe changes constantly, that is, the flushing angle of the ink to the filter screen changes constantly, so as to reduce the backflush dead angle, thereby greatly improving the effect and completeness of the backflush unblocking.

[0014] Optionally, the two side edges of the three-prism frame are fixedly connected with arc-shaped collecting plates, the outer arc surface of the collecting plate is attached to the inner circumferential surface of the flow collecting cylinder, and the inner arc surface of the collecting plate and the surface of the filter screen form an included angle region for collecting impurities.

[0015] By adopting the above technical solution, the impurities can be gathered in the included angle region between the inner arc surface of the collecting plate and the surface of the filter screen, so as to facilitate subsequent unified cleaning of the impurities.

[0016] Optionally, the collecting plate is made of rubber, and the side of the collecting plate away from the side edge of the three-prism frame is a free side; the pipe opening of the shunt pipe facing the flow collecting cylinder is fixed with an inclined guide screen made of metal; during the movement of the three-prism frame from the first station to the second station or the third station, the outer arc surface of the collecting plate abuts against the inclined surface of the guide screen, and the free side of the collecting plate elastically deforms and deviates towards the screen surface of the filter screen; when the three-prism frame is located at the second station or the third station, the free side of the collecting plate abuts against the screen surface of the filter screen.

[0017] By adopting the above technical solution, when the free side of the collecting plate abuts against the screen surface of the filter screen, the collecting plate can surround the impurities gathered at the side edge position of the filter screen as much as possible, thereby improving the stability of the gathered impurities.

[0018] Optionally, the device further comprises a fitting plate, a third motor, a first rotating shaft, a fixed shaft and a first swing lever, the first rotating shaft and the fixed shaft are parallel to the axis of the converging cylinder, the third motor is used to drive the first rotating shaft to rotate, the first swing lever is perpendicular to the first rotating shaft, and the two ends of the first swing lever are fixedly connected with the fixed shaft and the first rotating shaft respectively; the middle part of the fitting plate is provided with a through hole, the fixed shaft passes through the through hole, and the fitting plate is arranged in a rotationally relative manner with the fixed shaft; when the three-prism frame is located at the second station or the third station, the third motor drives the first swing lever and the fixed shaft to swing around the axis of the first rotating shaft, the fitting plate is fitted to the screen surface of the filter screen, and the mesh of the filter screen which is not fitted by the fitting plate is arranged to face the inner circumferential surface of the converging cylinder.

[0019] By adopting the above technical scheme, when the three-prism frame is located at the second station or the third station, the third motor drives the first swing lever and the fixed shaft to swing around the axis of the first rotating shaft, and the fitting plate is fitted to the screen surface of the filter screen, that is, the part of the mesh of the filter screen is blocked to block the ink from moving through the part of the mesh, so that the ink is forced to move along the inclined filter screen and enter the converging cylinder through the unblocked mesh, in this process, the ink will more stably push the impurities to move, so that the impurities carried by the ink gradually gather at the included angle between the filter screen and the inner circumferential surface of the converging cylinder.

[0020] Optionally, the filter screen is a nylon screen, one end of the converging cylinder is closed, and the other end of the converging cylinder is detachably provided with a cover plate; the three-prism frame comprises a bottom plate and two square frames, the bottom plate is triangular, and the bottom plate is fitted to the inner bottom of the converging cylinder; the angle control assembly comprises a first motor, the first motor is installed on the outer bottom of the converging cylinder, the output shaft of the first motor passes through the center of the converging cylinder and is detachably connected with the bottom plate; two vertices of the bottom plate close to the discharge pipe are respectively fixedly provided with a stand, and the stand is parallel to the axis of the converging cylinder; the square frame comprises a vertical pipe, a vertical rod and two elastic telescopic rods, the vertical pipe and the vertical rod are parallel to the axis of the converging cylinder, the elastic telescopic rods are perpendicular to the vertical pipe, the vertical pipe is rotatably arranged outside the stand, and the two ends of the elastic telescopic rods are respectively fixedly connected with the end portions of the vertical pipe and the vertical rod, and one of the elastic telescopic rods is used to fit the side edge of the bottom plate; two opposite side edges of the filter screen are respectively fixed with the vertical pipe and the vertical rod, and the other two opposite side edges of the filter screen are respectively fixed with a screen sleeve, the two screen sleeves are respectively sleeved outside the two elastic telescopic rods, and the elastic force of the elastic telescopic rods is used to force the vertical rod to abut against the inner circumferential surface of the converging cylinder; a fourth motor is fixed outside the converging cylinder, the output shaft of the fourth motor is parallel to the axis of the converging cylinder, a second swing lever is fixedly arranged on the output shaft of the fourth motor, and the end portion of the second swing lever abuts against the elastic telescopic rod; when the second swing lever swings in the direction of the discharge pipe, the second swing lever drives the square frame to deflect away from the bottom plate and the elastic telescopic rods to contract.

[0021] By adopting the above technical solution, when the second swing rod swings towards the direction of the diverter pipe, the second swing rod drives the square frame to deflect away from the bottom plate. During this process, the vertical rod is always in contact with the inner circumference of the manifold, the distance between the vertical rod and the riser pipe is shortened, and the elastic telescopic rod contracts to force the filter screen to fold, that is, the filter screen is in a relaxed state. Under the backwashing action of the ink, the filter screen adapts to the ink flow direction and kinetic energy, thereby reducing the pressure loss of the filter screen on the ink and thus improving the backwashing effect.

[0022] Optionally, one end of the manifold is closed, and the other end of the manifold is detachably equipped with a cover plate; the triangular prism frame includes a base plate and two square frames, wherein the base plate is triangular and fits against the inner bottom of the manifold; the angle control component includes a first motor, which is installed on the outer bottom of the manifold, and the output shaft of the first motor passes through the center of the manifold and is detachably connected to the base plate; the square frame includes two uprights and two crossbars, one of the crossbars is fixed to the side of the base plate, the uprights are parallel to the axis of the manifold, and the two ends of the uprights are respectively fixed to the ends of the two crossbars; the surface of the uprights is tangentially abutting against the inner circumferential surface of the manifold; the filter screen is installed inside the square frame.

[0023] By adopting the above technical solution, when it is necessary to disassemble the filter screen, first remove the cover plate, then disconnect the connection between the output shaft of the first motor and the base plate, and then take out the triangular prism frame and the filter screen from the opening of the manifold, which is convenient and quick.

[0024] Optionally, the fluid delivery assembly includes a blade and a second motor. The blade is located inside the flow divider and is rotatably arranged relative to the flow divider. The second motor drives the blade to rotate via gear transmission.

[0025] This application provides a printing apparatus that adopts the following technical solution:

[0026] A printing apparatus includes an ink constant temperature circulation and filtration mechanism and a printing press body.

[0027] This application provides a printing apparatus that adopts the following technical solution:

[0028] A decorative paper printing process includes the following steps: the heating structure heats the ink in the ink tank; the triangular prism frame is located at the first station; the circulation pump is started to drive the ink to circulate along the path of the ink tank, inlet pipe, branch pipe, manifold, outlet pipe, and ink tank; the decorative paper is placed into the printing machine body for printing; when it is necessary to clean the impurities on the filter screen, the circulation pump is turned off, and the first and second switching valves are closed, so that the two branch pipes and the manifold form a closed loop flow channel; the angle control component moves the triangular prism frame to the second and third stations successively; when the triangular prism frame is located at the second or third station, one of the fluid delivery components is started, and the ink in the closed loop flow channel circulates in one direction. The ink will backwash the impurities on one of the filter screens and carry the impurities to the angle between the other filter screen and the inner circumference of the manifold.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] By setting up an inlet pipe, an outlet pipe, an arc-shaped diversion pipe, a manifold, a triangular prism frame, and an angle control component, and utilizing the unidirectional closed-loop flow channel of the ink, not only can the two filters be backflushed and cleared in succession, but also impurities can be collected by utilizing the angle change of the filters, so as to reduce the secondary clogging of the filters by impurities, thereby greatly reducing the frequency of filter disassembly and maintenance.

[0031] By setting up a bonding plate to block part of the filter screen, the ink is prevented from moving through that part of the screen. This forces the ink to move along the inclined filter screen and enter the manifold through the unblocked screen. During this process, the ink will more stably push the impurities to move, so that the impurities carried by the ink gradually gather at the angle between the first screen and the inner circumference of the manifold.

[0032] By setting up a retractable square frame and a flexible foldable filter screen, and using the drive of the second swing arm to force the elastic telescopic rod to contract, the filter screen is forced to fold, that is, the filter screen is in a relaxed state. Under the backwash of the ink, the filter screen adapts to the ink flow direction and kinetic energy, thereby reducing the pressure loss of the filter screen on the ink and improving the backwash effect. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the ink constant temperature circulation filter mechanism of Example 1.

[0034] Figure 2 This is a schematic diagram of the triangular prism frame of Example 1 in the first working position.

[0035] Figure 3 This is a schematic diagram of the triangular prism frame of Example 1.

[0036] Figure 4This is a partial schematic diagram of the triangular prism frame of Example 1 in the second working position.

[0037] Figure 5 This is a schematic diagram of the triangular prism frame of Example 1 in the second working position.

[0038] Figure 6 This is a schematic diagram of the triangular prism frame of Example 1 in the third position.

[0039] Figure 7 This is a schematic diagram of the printing apparatus of Example 1.

[0040] Figure 8 This is a schematic diagram of the triangular prism frame in the second work position in Example 2.

[0041] Figure 9 This is a schematic diagram of Embodiment 3 illustrating the transmission relationship between the third motor and the bonding plate.

[0042] Figure 10 This is a partial schematic diagram of the triangular prism frame in the second work position of Example 3.

[0043] Figure 11 This is a schematic diagram of the triangular prism frame in Example 4.

[0044] Figure 12 This is a front view of the filter screen in Example 4.

[0045] Figure 13 This is a schematic diagram of the second pendulum and the fourth motor in Embodiment 4.

[0046] Figure 14 This is a partial schematic diagram of the triangular prism frame in the second work position of Example 4.

[0047] Explanation of reference numerals in the attached drawings: 1. Manifold; 2. Triangular prism frame; 3. Filter screen; 5. Fluid conveying assembly; 10. Oil tank; 100. Printing press body; 101. Inlet pipe; 102. Diverter pipe; 103. Outlet pipe; 104. Circulation pump; 105. First switching valve; 106. Second switching valve; 11. Cover plate; 12. Guide screen; 13. Third motor; 131. First rotating shaft; 132. First swing arm; 133. Fixed shaft; 13 4. Adhesive plate; 15. Fourth motor; 151. Second swing arm; 21. Base plate; 211. Column; 22. Upright pole; 23. Horizontal bar; 24. Support plate; 25. Collection plate; 26. Riser; 27. Vertical pole; 28. Elastic telescopic pole; 31. First net body; 32. Second net body; 33. Net sleeve; 51. Second motor; 52. Paddle; 53. Third shaft; 61. First motor; 62. Fourth shaft; 63. Ring protrusion; 64. Nut. Detailed Implementation

[0048] The following is in conjunction with the appendix Figure 1 - Appendix Figure 14 This application will be described in further detail.

[0049] Example 1 discloses an ink constant temperature circulation filtration mechanism, such as... Figure 1 , Figure 2 and Figure 3 As shown, the ink constant temperature circulation filtration mechanism includes an oil tank 10, a circulation pump 104, an inlet pipe 101, an outlet pipe 103, an arc-shaped diversion pipe 102, a manifold 1, a triangular prism frame 2, an angle control component, and two filter screens 3.

[0050] The oil tank 10 is equipped with a heating structure (not shown in the figure). The heating structure can be an electric heating wire or a heating tube with hot oil flowing through it. The heating structure is used to heat the ink in the oil tank 10 so that the ink maintains a relatively stable temperature. The circulation pump 104 is used to apply the power of circulation to the ink.

[0051] One end of the inlet pipe 101 and the outlet pipe 103 are respectively connected to the two sides of the oil tank 10. The inlet pipe 101 is equipped with a first switch valve 105, and the outlet pipe 103 is equipped with a second switch valve 106.

[0052] like Figure 2 As shown, two diversion pipes 102 are arranged side by side, and one end of the two diversion pipes 102 is connected to the outlet end of the inlet pipe 101. Three openings are provided through the outer circumference of the manifold 1, and the three openings are respectively connected to the end of the outlet pipe 103 and the end of the two diversion pipes 102.

[0053] like Figure 2 As shown, both diversion pipes 102 are equipped with fluid delivery components 5. The fluid delivery components 5 of the two diversion pipes 102 have the same delivery direction, that is, both drive the ink to move towards the manifold 1. The start-up time of the fluid delivery components 5 of the two diversion pipes 102 is staggered, that is, when one fluid delivery component 5 is started, the other fluid delivery component 5 is not started.

[0054] Specifically, the fluid conveying assembly 5 includes a blade 52 and a second motor 51. The blade 52 is located inside the diversion pipe 102. A third rotating shaft 53 is rotatably connected inside the diversion pipe 102. The blade 52 is fixed to the third rotating shaft 53. The second motor 51 is fixed to the outside of the diversion pipe 102. The output shaft of the second motor 51 passes through the diversion pipe 102. The output shaft of the second motor 51 transmits torque to the third rotating shaft 53 through two bevel gears.

[0055] like Figure 3 , Figure 4 As shown, one end of the manifold 1 is closed, and the other end of the manifold 1 is detachably equipped with a cover plate 11 (see...). Figure 1The detachable method can be bolt connection. The triangular prism frame 2 is located inside the manifold 1. The triangular prism frame 2 includes a base plate 21 and two square frames, wherein the base plate 21 is triangular and fits into the inner bottom of the manifold 1. The base plate 21 is fixed with a support plate 24.

[0056] like Figure 3 , Figure 4 As shown, the square frame includes two uprights 22 and two horizontal bars 23. The two uprights 22 and two horizontal bars 23 serve as the four sides of the square frame. The two horizontal bars 23 are arranged vertically. One of the horizontal bars 23 is fixed to the side of the base plate 21. The uprights 22 are parallel to the axis of the manifold 1. The two ends of the uprights 22 are fixed to the ends of the two horizontal bars 23 respectively. The outer circumferential surface of the uprights 22 is tangential to the inner circumferential surface of the manifold 1.

[0057] The filter screen 3 is installed inside a square frame, that is, the filter screen 3 is square. The four sides of the filter screen 3 are fixed to two uprights 22 and two horizontal bars 23 respectively, and the two filter screens 3 are respectively set to the ports of the two diversion pipes 102.

[0058] An angle control component drives the triangular prism frame 2 to rotate around the axis of the manifold 1, thereby controlling the angle between the filter screen 3 and the axis of the diverter pipe 102; one of the filter screens 3 is designated as the first mesh body 31, and the other filter screen 3 is designated as the second mesh body 32. When the triangular prism frame 2 is in the first working position (see...), Figure 2 The surfaces of the two filter screens 3 are perpendicular to the axes of the corresponding diverter pipes 102; when the triangular prism frame 2 is in the second position (see... Figure 5 The included angle between the axis of the first mesh 31 and the axis of the diversion pipe 102 is 100°-130°; when the triangular prism frame 2 is located in the third position (see... Figure 6 The included angle between the axis of the second mesh 32 and the axis of the diversion pipe 102 is 100°-130°.

[0059] Specifically, the angle control component includes a first motor 61, which is installed on the outer bottom of the manifold 1. The output shaft of the first motor 61 passes through the center of the manifold 1 and is detachably connected to the support plate 24. Specifically, the output shaft of the first motor 61 is fixed with a fourth rotating shaft 62, and the fourth bearing is fixed with an annular protrusion 63. The fourth rotating shaft 62 passes through the support plate 24 and is threaded with a nut 64. The nut 64 and the annular protrusion 63 press the support plate 24 to fix the first motor 61 to the base plate 21. To increase the fixing friction, a rubber pad can be set on the annular protrusion 63.

[0060] Furthermore, in this embodiment, one of the uprights 22 of the square frame is fixedly connected to an arc-shaped collecting plate 25. The outer arc surface of the collecting plate 25 is in contact with the inner circumferential surface of the manifold 1, and the inner arc surface of the collecting plate 25 forms an angled area with the surface of the filter screen 3 for collecting impurities. In other embodiments, the collecting plate 25 may not be necessary, and the angle between the filter screen 3 and the inner circumferential surface of the manifold 1 can also serve to collect impurities.

[0061] Example 1 also discloses a printing apparatus, such as Figure 7 As shown, the printing apparatus includes a printing press body 100 and the aforementioned ink constant temperature circulation and filtration mechanism.

[0062] Example 1 also discloses a decorative paper printing process using the above-mentioned printing device. The decorative paper printing process includes the following steps: the heating structure heats the ink in the ink tank 10. At this time, the triangular prism frame 2 is located at the first station. The circulation pump 104 is started to drive the ink to circulate along the path of the ink tank 10, the inlet pipe 101, the diversion pipe 102, the manifold 1, the outlet pipe 103, and the ink tank 10. During this process, the filter screen 3 intercepts and filters impurities in the ink.

[0063] The decorative paper is placed into the printing press body 100 for printing.

[0064] When it is necessary to clean the impurities in the filter screen 3, the circulation pump 104 is turned off, the first switch valve 105 and the second switch valve 106 are turned off, so that the two diversion pipes 102 and the manifold 1 form a closed loop flow channel, and the angle control component moves the triangular prism frame 2 to the second and third work positions in turn.

[0065] During the process of the triangular prism frame 2 moving from the first station to the second station, one of the fluid delivery components 5 is activated (the other fluid delivery component 5 is not activated), and the ink in the closed loop flows in a unidirectional circulation. The ink will backwash the impurities on one of the filter screens 3 and carry the impurities along the diversion pipe 102 to the other filter screen 3. Figure 4 (The solid arrow indicates the direction of ink flow, and the hollow arrow indicates the direction of impurity movement.) Since the angle between the filter screen 3 and the axis of the diversion pipe 102 is 100°-130°, the ink carrying impurities will move along the inclined surface of the filter screen 3. The impurities carried by the ink gradually converge in the angled area between the filter screen 3 and the inner arc surface of the collection plate 25.

[0066] In this way, not only are the two filter screens 3 cleared, but impurities are also collected to reduce secondary clogging of the filter screens 3, thereby greatly reducing the frequency of disassembly and maintenance of the filter screens 3.

[0067] Furthermore, as the triangular prism frame 2 moves from the first station to the second and third stations, the angle between the filter screen 3 and the axis of the diversion pipe 102 changes continuously, that is, the scouring angle of the ink on the filter screen 3 changes continuously to reduce the backwash dead angle, thereby greatly improving the backwashing and clogging effect and completeness.

[0068] Example 2 differs from Example 1 in that, as Figure 8 As shown, the collecting plate 25 is made of rubber, and the side of the collecting plate 25 away from the upright 22 is designated as the free side.

[0069] A guide net 12 is fixed at an angle to the opening of the diverter pipe 102 facing the manifold 1. The mesh size of the guide net 12 is larger than that of the filter net 3. The guide net 12 is made of metal and extends into the manifold 1.

[0070] As the triangular prism frame 2 moves from the first station to the second or third station, the outer arc surface of the collecting plate 25 abuts against the inclined surface of the guide net 12, and the free side of the collecting plate 25 is elastically deformed and shifted towards the filter net 3. When the triangular prism frame 2 is located at the second or third station, the free side of the collecting plate 25 abuts against the mesh surface of the filter net 3. At this time, the collecting plate 25 can surround the impurities gathered at one side of the filter net 3 as much as possible, thereby improving the stability of the gathered impurities.

[0071] Example 3 differs from Example 1 in that, as Figure 9 , Figure 10 As shown, the ink constant temperature circulation filter mechanism also includes a bonding plate 134, a third motor 13, a first rotating shaft 131, a fixed shaft 133, and a first swing arm 132. The first rotating shaft 131 and the fixed shaft 133 are both parallel to the axis of the manifold 1. The first rotating shaft 131 and the fixed shaft 133 are not collinear. The third motor 13 is installed on the upper surface of the cover plate 11. The output shaft of the third motor 13 passes through the cover plate 11 and is fixed to the first rotating shaft 131. The first swing arm 132 is perpendicular to the first rotating shaft 131. The two ends of the first swing arm 132 are fixedly connected to the upper end of the fixed shaft 133 and the lower end of the first rotating shaft 131, respectively.

[0072] The bonding plate 134 has a through hole in the middle, through which the fixing shaft 133 passes, so that the bonding plate 134 and the fixing shaft 133 are rotatably arranged relative to each other.

[0073] When the triangular prism frame 2 is located at the second or third station, the third motor 13 drives the first swing rod 132 and the fixed shaft 133 to swing around the axis of the first swing shaft 131 via the first rotating shaft 131. The bonding plate 134 is bonded to the mesh surface of the filter screen 3, that is, it blocks part of the mesh of the filter screen 3 to prevent ink from moving through the mesh. The mesh of the filter screen 3 that is not bonded by the bonding plate 134 is set facing the inner circumferential surface of the manifold 1, so that the ink moves along the inclined filter screen 3 and enters the manifold 1 through the unblocked mesh. During this process, the ink will more stably push the impurities to move, so that the impurities carried by the ink gradually gather at the angle between the filter screen 3 and the inner circumferential surface of the manifold 1.

[0074] It should be noted that during the switching of the triangular prism frame 2, the first swing rod 132 can adjust the position of the bonding plate 134 to avoid the filter screen 3, thereby reducing the expansion interference of the filter screen 3. The first swing rod 132 can also move adaptively so that during the switching of the triangular prism frame 2, the bonding plate 134 is in real time attached to the mesh surface of the filter screen 3.

[0075] Example 4 differs from Example 1 in that, as Figure 11 , Figure 12 As shown, two uprights 211 are fixed to the two vertices of the base plate 21 near the discharge pipe 103, and the uprights 211 are parallel to the axis of the manifold 1. The square frame includes a riser 26, a vertical rod 27 and two elastic telescopic rods 28. The two elastic telescopic rods 28 are arranged vertically. Each elastic telescopic rod 28 includes a rod body and a pipe body (not shown in the figure). The pipe body is slidably sleeved on the outside of the rod body, and a spring (not shown in the figure) is provided inside the pipe body. The elastic force of the spring is used to force the rod body axially away from the pipe body.

[0076] Both the riser 26 and the vertical rod 27 are parallel to the axis of the manifold 1. The elastic telescopic rod 28 is perpendicular to the riser 26. The riser 26 is rotatably sleeved on the outside of the column 211. The two ends of the elastic telescopic rod 28 are fixed to the ends of the riser 26 and the vertical rod 27, respectively. The filter screen 3 is a nylon mesh. Two opposite sides of the filter screen 3 are fixed to the riser 26 and the vertical rod 27, respectively. The other two opposite sides of the filter screen 3 are fixed with mesh sleeves 33. The two mesh sleeves 33 are respectively sleeved on the outside of the two elastic telescopic rods 28.

[0077] At the first station, the elastic force of the elastic telescopic rod 28 is used to force the vertical rod 27 to abut against the angle between the inner circumferential surface of the manifold 1 and the side of the base plate 21, so that the elastic telescopic rod 28 located below fits against the side of the base plate 21, and the filter screen 3 is in a taut state.

[0078] like Figure 13As shown, a fourth motor 15 is fixed on the upper surface of the cover plate 11. The output shaft of the fourth motor 15 is parallel to the axis of the manifold 1. The output shaft of the fourth motor 15 passes through the cover plate 11 and is fixed with a second swing rod 151. The second swing rod 151 is perpendicular to the output shaft of the fourth motor 15.

[0079] When the triangular prism frame 2 is in the second or third station (see...) Figure 14 When the fourth motor 15 drives the second swing rod 151 to swing towards the direction of the diverter pipe 102, the end of the second swing rod 151 abuts against the upper elastic telescopic rod 28, so as to drive the square frame to deflect away from the bottom plate 21. Since the vertical rod 27 always abuts against the inner circumference of the manifold 1, the elastic telescopic rod 28 gradually contracts during this process, and the distance between the vertical rod 27 and the riser pipe 26 is shortened, so as to force the filter screen 3 to fold, that is, the filter screen 3 is in a relaxed state. Under the backwashing action of the ink, the filter screen 3 adapts to the ink flow direction and kinetic energy, thereby reducing the pressure loss of the filter screen 3 on the ink, and thus improving the backwashing effect.

[0080] It should be noted that during the switching of the triangular prism frame 2, the fourth motor 15 can adjust the position of the second swing arm 151 to avoid the filter screen 3, thereby reducing the expansion interference of the filter screen 3.

[0081] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A constant-temperature circulating filter mechanism for ink, characterized in that: The system includes an oil tank (10), a circulating pump (104), an inlet pipe (101), an outlet pipe (103), an arc-shaped branch pipe (102), a manifold (1), a triangular prism frame (2), an angle control assembly, and two filters (3). The oil tank (10) is equipped with a heating structure. One end of the inlet pipe (101) and the outlet pipe (103) are connected to both sides of the oil tank (10). The two branch pipes (102) are arranged side-by-side, with one end of each branch pipe (102) connected to the outlet end of the inlet pipe (101). The outer circumferential surface of the manifold (1) has three openings. The openings are respectively connected to the end of the discharge pipe (103) and the ends of the two branch pipes (102); the triangular prism frame (2) is located inside the manifold (1), and the three side edges of the triangular prism frame (2) abut against the inner circumferential surface of the manifold (1); two filter screens (3) are respectively set on two of the two side surfaces of the triangular prism frame (2), and the two filter screens (3) are respectively set at the ports of the two branch pipes (102); the inlet pipe (101) is provided with a first switching valve (105), the two branch pipes (102) are each provided with a fluid conveying assembly (5), and the discharge pipe (103) is provided with a second switching valve (105). Close the valve (106); the angle control component drives the triangular prism frame (2) to rotate around the axis of the manifold (1) to control the angle between the filter screen (3) and the axis of the diversion pipe (102); one of the filter screens (3) is designated as the first screen body (31), and the other filter screen (3) is designated as the second screen body (32). When the triangular prism frame (2) is located in the first position, the surfaces of the two filter screens (3) are perpendicular to the axis of the corresponding diversion pipe (102); when the triangular prism frame (2) is located in the second position, the angle between the first screen body (31) and the axis of the corresponding diversion pipe (102) is... The included angle is 100°-130°. The ink carrying impurities will move along the inclined surface of the first mesh (31), and the impurities carried by the ink will gradually converge at the included angle between the inner circumferential surface of the first mesh (31) and the manifold (1). When the triangular prism frame (2) is located in the third station, the included angle between the axis of the second mesh (32) and the corresponding diverter (102) is 100°-130°. The ink carrying impurities will move along the inclined surface of the second mesh (32), and the impurities carried by the ink will gradually converge at the included angle between the inner circumferential surface of the second mesh (32) and the manifold (1).

2. The ink constant temperature circulation filtration mechanism according to claim 1, characterized in that: The two side edges of the triangular prism frame (2) are fixedly connected to an arc-shaped collection plate (25). The outer arc surface of the collection plate (25) is attached to the inner circumferential surface of the manifold (1). An angled area for collecting impurities is formed between the inner arc surface of the collection plate (25) and the surface of the filter screen (3).

3. The ink constant temperature circulation filtration mechanism according to claim 2, characterized in that: The collecting plate (25) is made of rubber, and the side of the collecting plate (25) away from the side edge of the triangular prism frame (2) is set as the free side; the pipe opening of the diverter pipe (102) facing the manifold (1) is fixed with an inclined guide net (12), which is made of metal; when the triangular prism frame (2) moves from the first station to the second or third station, the outer arc surface of the collecting plate (25) abuts against the inclined surface of the guide net (12), and the free side of the collecting plate (25) is elastically deformed and shifted towards the filter screen (3); when the triangular prism frame (2) is located at the second or third station, the free side of the collecting plate (25) abuts against the mesh surface of the filter screen (3).

4. The ink constant temperature circulation filtration mechanism according to claim 1 or 2, characterized in that: It also includes a bonding plate (134), a third motor (13), a first rotating shaft (131), a fixed shaft (133), and a first swing arm (132). The first rotating shaft (131) and the fixed shaft (133) are both parallel to the axis of the manifold (1). The third motor (13) is used to drive the first rotating shaft (131) to rotate. The first swing arm (132) is perpendicular to the first rotating shaft (131), and the two ends of the first swing arm (132) are fixedly connected to the fixed shaft (133) and the first rotating shaft (131) respectively. The bonding plate (134) has a central part... There is a perforation, and the fixed shaft (133) passes through the perforation. The bonding plate (134) is set to rotate relative to the fixed shaft (133). When the triangular prism frame (2) is located at the second or third station, the third motor (13) drives the first swing rod (132) and the fixed shaft (133) to swing around the axis of the first swing shaft (131) through the first rotating shaft (131). The bonding plate (134) is attached to the mesh surface of the filter screen (3). The mesh of the filter screen (3) that is not attached by the bonding plate (134) is set facing the inner circumferential surface of the manifold (1).

5. The ink constant temperature circulation filtration mechanism according to claim 1 or 2, characterized in that: The filter screen (3) is a nylon mesh. One end of the manifold (1) is closed, and the other end of the manifold (1) is detachably equipped with a cover plate (11). The triangular prism frame (2) includes a base plate (21) and two square frames, wherein the base plate (21) is triangular and fits against the inner bottom of the manifold (1). The angle control component includes a first motor (61), which is installed on the outer bottom of the manifold (1). The output shaft of the first motor (61) passes through the center of the manifold (1) and is perpendicular to the base plate (21). The bottom plate (21) is detachably connected; two vertices near the discharge pipe (103) of the bottom plate (21) are respectively fixed with columns (211), and the columns (211) are parallel to the axis of the manifold (1); the square frame includes a riser (26), a vertical rod (27) and two elastic telescopic rods (28), the riser (26) and the vertical rod (27) are both parallel to the axis of the manifold (1), the elastic telescopic rods (28) are perpendicular to the riser (26), the riser (26) is rotatably sleeved on the outside of the column (211), and the elastic telescopic rods (28) are perpendicular to the riser (26). 8) The two ends of the filter screen (3) are fixed to the ends of the riser (26) and the vertical rod (27) respectively. One of the elastic telescopic rods (28) is used to fit against the side of the base plate (21). Two opposite sides of the filter screen (3) are fixed to the riser (26) and the vertical rod (27) respectively. The other two opposite sides of the filter screen (3) are fixed with mesh sleeves (33). The two mesh sleeves (33) are respectively fitted on the outside of the two elastic telescopic rods (28). The elastic force of the elastic telescopic rods (28) is used to force the vertical rod (27) to abut against the manifold (1). The inner circumferential surface of the manifold (1) is fixed with a fourth motor (15) on the outside. The output shaft of the fourth motor (15) is parallel to the axis of the manifold (1). The output shaft of the fourth motor (15) is vertically fixed with a second swing rod (151). The end of the second swing rod (151) abuts against the elastic telescopic rod (28). When the second swing rod (151) swings along the direction of the diversion pipe (102), the second swing rod (151) drives the square frame to deflect away from the bottom plate (21) and the elastic telescopic rod (28) retracts.

6. The ink constant temperature circulation filtration mechanism according to claim 1, characterized in that: One end of the manifold (1) is closed, and the other end of the manifold (1) is detachably provided with a cover plate (11); the triangular prism frame (2) includes a base plate (21) and two square frames, wherein the base plate (21) is triangular and fits against the inner bottom of the manifold (1); the angle control component includes a first motor (61), the first motor (61) is installed on the outer bottom of the manifold (1), and the output shaft of the first motor (61) passes through the manifold (1). The square frame is located at the center of the base plate (21) and is detachably connected to the base plate (21); the square frame includes two uprights (22) and two crossbars (23), one of the crossbars (23) is fixed to the side of the base plate (21), the uprights (22) are parallel to the axis of the manifold (1), the two ends of the uprights (22) are fixed to the ends of the two crossbars (23) respectively, the surface of the uprights (22) is tangential to the inner circumferential surface of the manifold (1), and the filter screen (3) is installed in the square frame.

7. The ink constant temperature circulation filtration mechanism according to claim 1, characterized in that: The fluid delivery assembly (5) includes a blade (52) and a second motor (51). The blade (52) is located in the inner cavity of the diversion pipe (102) and is rotatably arranged relative to the diversion pipe (102). The second motor (51) drives the blade (52) to rotate through gear transmission.

8. A printing apparatus, characterized in that: Includes the ink constant temperature circulation filter mechanism and the printing press body (100) as described in claim 1.

9. A decorative paper printing process using the printing apparatus of claim 8, characterized in that: Includes the following steps: The heating structure heats the ink in the oil tank (10). The triangular prism frame (2) is located at the first station. The circulation pump (104) is started to drive the ink to circulate along the path of the oil tank (10), inlet pipe (101), branch pipe (102), manifold (1), outlet pipe (103), and oil tank (10). Decorative paper is placed into the printing press body (100) for printing. When it is necessary to clean the impurities in the filter screen (3), the circulation pump (104) is turned off, and the first switch valve (105) and the second switch valve (105) are activated. When the switch valve (106) is closed, the two branch pipes (102) and the manifold (1) form a closed loop. The angle control component moves the triangular prism frame (2) to the second and third work positions in turn. During the process of the triangular prism frame (2) being in the second or third work position, one of the fluid delivery components (5) is activated, and the ink in the closed loop flows in a unidirectional circulation. The ink will backwash the impurities on one of the filter screens (3) and carry the impurities to the angle between the other filter screen (3) and the inner circumference of the manifold (1).

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