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

Abstract

The invention relates to a printing ink constant-temperature circulating filtering mechanism, a printing device and a printing process of decorative paper, and relates to the technical field of printing ink filtering, and the printing ink constant-temperature circulating filtering mechanism comprises an oil tank, a circulating pump, an inlet pipe, a discharge pipe, an arc-shaped flow dividing pipe, a confluence cylinder, a triangular prism frame, an angle control assembly and two filter screens; the three side edges of the triangular prism frame abut against the inner circumferential face of the confluence cylinder, the two filter screens are arranged on the two side faces of the triangular prism frame respectively, and the two filter screens correspond to ports of the two flow dividing pipes respectively. The two flow dividing pipes are each provided with a fluid conveying assembly, and the angle control assembly drives the triangular prism frame to rotate around the axis of the confluence cylinder so as to control the angle between the filter screen and the axis of the flow dividing pipes. The filter has the effect of reducing the dismounting and maintenance frequency of the filter screen.

Description

Technical Field

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

[0002] Decorative paper is an indispensable raw material in many building materials products, such as low-pressure boards and high-pressure boards used in furniture and cabinets, as well as fireproof boards and floors. In the product structure, decorative paper mainly plays a decorative role in providing patterns and a covering role in preventing the bottom glue from seeping through.

[0003] In the production process of decorative paper, it is often necessary to use a printing device to print the 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 to circulate the ink to help the pigment, solvent and additive in the ink to be evenly distributed, prevent precipitation or stratification, ensure the consistency and stability of the printed color, and speed up the ink renewal speed to ensure that the ink is in the best state, while also maintaining a uniform temperature of the ink.

[0004] During the production, storage or use of ink, certain impurities such as dust, metal chips and other particles may be mixed in the ink. Therefore, a filter is often provided in the ink constant temperature circulation mechanism to filter out the impurities.

[0005] However, when the filter is clogged, the machine needs to be shut down and the filter needs to be disassembled, which is rather cumbersome. If the filter is frequently clogged, the frequency of disassembly and installation is high. Summary of the invention

[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 for decorative paper.

[0007] The present application provides an ink constant temperature circulation filtration mechanism adopts the following technical solution: An ink constant temperature circulation filtering mechanism comprises an oil tank, a circulation pump, an inlet pipe, an outlet pipe, an arc-shaped shunt pipe, a confluence tube, a triangular prism frame, an angle control assembly and two filter screens. A heating structure is arranged in the oil tank, wherein one end of the inlet pipe and the outlet pipe are respectively connected to the two sides of the oil tank, the two shunt pipes are arranged side by side, one end of the two shunt pipes is commonly connected to the outlet end of the inlet pipe, and three openings are penetrated through the outer peripheral surface of the confluence tube, and the three openings are respectively connected to the end of the outlet pipe and the end of the two shunt pipes; the triangular prism frame is located in the confluence tube, and the three side edges of the triangular prism frame are all in contact with the inner peripheral surface of the confluence tube, and the two filter screens are respectively arranged on two side surfaces of the triangular prism frame, and the two filter screens correspond to the two shunt pipes respectively. port setting; the inlet pipe is provided with a first switch valve, the two shunt pipes are provided with a fluid delivery assembly, and the discharge pipe is provided with a second switch valve; the angle control assembly drives the triangular prism frame to rotate around the axis of the confluence tube to control the angle between the filter screen and the axis of the shunt pipe; one of the filter screens is set as the first mesh body, and the other filter screen is set as the second mesh body. When the triangular prism frame is located at the first station, the surfaces of the two filter screens are respectively perpendicular to the axis of the corresponding shunt pipe; when the triangular prism frame is located at the second station, the angle between the first mesh body and the axis of the shunt pipe is 100°-130°; when the triangular prism frame is located at the third station, the angle between the second mesh body and the axis of the shunt pipe is 100°-130°.

[0008] By adopting the above technical solution, when the triangular prism frame is located at the first workstation, the circulation pump is started to drive the ink to circulate along the path of the oil tank, inlet pipe, branch pipe, manifold, discharge pipe, and oil tank. During this process, the filter screen intercepts and filters impurities in the ink.

[0009] When it is necessary to clear the impurities blocking the filter screen, the circulation pump is closed, the first switch valve and the second switch valve are closed, so that the two shunt pipes and the manifold form a closed-loop flow channel, and the angle control component moves the triangular prism frame to the second station and the third station successively. During the process of the triangular prism frame moving from the first station to the second station, one of the fluid delivery components is started (the other fluid delivery component is not started), and the ink in the closed-loop flow channel circulates unidirectionally, and the ink passes through the first mesh body and the second mesh body successively. When the ink passes through the second mesh body, the ink backwashes away the impurities on the second mesh body and carries the impurities along the shunt pipe to the first mesh body. Since the angle between the first mesh body and the axis of the shunt pipe is 100°-130°, part of the ink carrying impurities will move along the inclined surface of the first mesh body, and the impurities carried by the ink gradually gather at the angle between the first mesh body and the inner circumference of the manifold.

[0010] During the process of the triangular prism frame moving from the first station to the third station, one of the fluid delivery components is started (the other fluid delivery component is not started), and the ink in the closed-loop flow channel circulates unidirectionally. The ink passes through the second mesh and the first mesh in turn. When the ink passes through the first mesh, the ink backwashes away the impurities on the first mesh and carries the impurities along the diversion tube to the second mesh. Since the angle between the second mesh and the axis of the diversion tube is 100°-130°, part of the ink carrying impurities will move along the inclined surface of the second mesh, and the impurities carried by the ink gradually gather at the angle between the second mesh and the inner circumference of the confluence tube.

[0011] In this way, not only can the two filters be cleared, but impurities can also be gathered and collected to reduce secondary blockage of the filters by impurities, thereby greatly reducing the frequency of disassembly and maintenance of the filters.

[0012] Moreover, in the process of the triangular prism frame moving from the first station to the second station and the third station successively, the angle of the filter relative to the axis of the diversion tube keeps changing, that is, the flushing angle of the ink on the filter keeps changing, so as to reduce the recoil dead angle, thereby greatly improving the recoil clearing effect and completeness.

[0013] Optionally, two side edges of the triangular prism frame are fixedly connected with arc-shaped collecting plates, the outer arc surface of the collecting plate fits the inner circumferential surface of the collecting tube, and the inner arc surface of the collecting plate and the surface of the filter screen form an angle area for collecting impurities.

[0014] By adopting the above technical solution, impurities can be gathered in the angle area between the inner arc surface of the collection plate and the surface of the filter screen, so as to facilitate the subsequent unified cleaning of impurities.

[0015] Optionally, the collecting plate is made of rubber material, and the side of the collecting plate away from the side edge of the triangular prism frame is set as the free side; the pipe mouth of the diversion pipe facing the collecting tube is fixed with an inclined guide net, and the guide net is made of metal; when the triangular prism frame moves 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 net, and the free side of the collecting plate elastically deforms and shifts toward the filter net; when the triangular prism frame is located at the second station or the third station, the free side of the collecting plate abuts against the mesh surface of the filter net.

[0016] By adopting the above technical solution, when the free side of the collecting plate abuts against the mesh surface of the filter screen, the collecting plate can surround the impurities gathered at the side edge of the filter screen as much as possible, thereby improving the stability of the gathered impurities.

[0017] Optionally, it also includes a bonding plate, a third motor, a first rotating shaft, a fixed shaft and a first swing rod, the first rotating shaft and the fixed shaft are parallel to the axis of the collector tube, the third motor is used to drive the first rotating shaft to rotate, the first swing rod is perpendicular to the first rotating shaft, and the two ends of the first swing rod are respectively fixedly connected to the fixed shaft and the first rotating shaft; a through hole is provided in the middle of the bonding plate, the fixed shaft passes through the through hole, and the bonding plate and the fixed shaft are arranged to rotate relative to each other; when the triangular prism frame is located at the second station or the third station, the third motor drives the first swing rod and the fixed shaft to swing around the axis of the first rotating shaft through the first rotating shaft, the bonding plate is bonded to the mesh surface of the filter screen, and the mesh of the filter screen that is not bonded by the bonding plate is arranged opposite to the inner circumference of the collector tube.

[0018] By adopting the above technical solution, when the triangular prism frame is located at the second station or the third station, the third motor drives the first swing arm and the fixed shaft to swing around the axis of the first rotating shaft through the first rotating shaft, and the bonding plate is bonded to the mesh surface of the filter screen, that is, part of the mesh of the filter screen is blocked to prevent the ink from moving through the part of the mesh, thereby forcing the ink to move along the inclined filter screen and enter the collector tube through the unblocked mesh. In this process, the ink will push the impurities to move more stably, so that the impurities carried by the ink gradually gather at the angle between the filter screen and the inner circumference of the collector tube.

[0019] Optionally, the filter screen is a nylon screen, one end of the collector tube is closed, and the other end of the collector tube is removably provided with a cover plate; the triangular prism frame includes a base plate and two square frames, wherein the base plate is a triangle, and the base plate fits the inner bottom of the collector tube, and the angle control assembly includes a first motor, which is installed on the outer bottom of the collector tube, and the output shaft of the first motor passes through the center of the collector tube and is detachably connected to the base plate; the two vertices of the base plate close to the discharge pipe are respectively fixed with columns, and the columns are parallel to the axis of the collector tube; the square frame includes 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 collector tube, the elastic telescopic rod is perpendicular to the vertical pipe, the vertical pipe is rotatably sleeved on the outside of the column, and the two ends of the elastic telescopic rod are rotatably sleeved on the outside of the column. The ends are respectively fixed to the ends of the vertical pipe and the vertical rod, and one of the elastic telescopic rods is used to fit the side of the bottom plate; two opposite sides of the filter screen are respectively fixed to the vertical pipe and the vertical rod, and the other two opposite sides of the filter screen are fixed with mesh sleeves, and the two mesh sleeves are respectively sleeved on the outsides of the two elastic telescopic rods, and the elastic force of the elastic telescopic rods is used to force the vertical rods to abut against the inner circumference of the collector tube; a fourth motor is fixed to the outside of the collector tube, and the output shaft of the fourth motor is parallel to the axis of the collector tube, and a second swing rod is vertically fixed to the output shaft of the fourth motor, and the end of the second swing rod abuts against the elastic telescopic rod, and when the second swing rod swings along the direction of the shunt pipe, the second swing rod drives the square frame to deflect in the direction away from the bottom plate and the elastic telescopic rod contracts.

[0020] By adopting the above technical solution, when the second swing arm swings toward the direction of the shunt pipe, the second swing arm drives the square frame to deflect in the direction away from the bottom plate. During this process, the vertical rod is always in contact with the inner circumference of the confluence tube, the distance between the vertical rod and the vertical pipe is shortened, and the elastic telescopic rod contracts to force the filter screen to fold, that is, the filter screen is relaxed. Under the recoil effect of the ink, the filter screen adaptively stretches according to the flow direction and kinetic energy of the ink, thereby reducing the pressure loss of the filter screen to the ink, and then improving the recoil effect.

[0021] Optionally, one end of the collector tube is closed, and the other end of the collector tube is removably provided 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 collector tube, and the angle control assembly includes a first motor, which is installed on the outer bottom of the collector tube, and the output shaft of the first motor passes through the center of the collector tube and is detachably connected to the base plate; the square frame includes two vertical poles and two horizontal poles, one of which is fixed to the side of the base plate, the vertical pole is parallel to the axis of the collector tube, the two ends of the vertical pole are respectively fixed to the ends of the two horizontal poles, the surface of the vertical pole is tangent to the inner circumference of the collector tube, and the filter is installed in the square frame.

[0022] By adopting the above technical solution, when the filter needs to be removed, the cover plate is first removed, then the connection between the first motor output shaft and the bottom plate is released, and then the triangular prism frame and the filter are taken out from the tube mouth of the confluence tube, which is convenient and quick.

[0023] Optionally, the fluid delivery component includes a paddle and a second motor, the paddle is located in the inner cavity of the shunt tube, and the paddle and the shunt tube are arranged to rotate relative to each other, and the second motor drives the paddle to rotate through gear transmission.

[0024] The present application provides a printing device, which adopts the following technical solution: A printing device comprises an ink constant temperature circulation filtering mechanism and a printing machine body.

[0025] The present application provides a printing device, which adopts the following technical solution: A decorative paper printing process comprises the following steps: the heating structure heats the ink in the oil 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 oil tank, the inlet pipe, the shunt pipe, the manifold, the discharge pipe and the oil tank, and the decorative paper is placed in the main body of the printing machine for printing; when it is necessary to clear the impurities in the filter screen, the circulation pump is closed, the first switch valve and the second switch valve are closed, so that the two shunt pipes and the manifold form a closed-loop flow channel, the angle control component moves the triangular prism frame to the second station and the third station successively, when the triangular prism frame is located at the second station or the third station, one of the fluid conveying components is started, and the ink in the closed-loop flow channel circulates unidirectionally, the ink will backwash the impurities on one of the filter screens, and carry the impurities to converge at the angle between the other filter screen and the inner circumference of the manifold.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: By setting up an inlet pipe, an outlet pipe, an arc-shaped shunt pipe, a confluence tube, a triangular prism frame and an angle control component, and utilizing the one-way closed-loop flow channel of the ink, not only can the two filters be recoiled and cleared in sequence, but also the impurities can be gathered and collected by utilizing the angle change of the filter to reduce the secondary blockage of the filter by impurities, thereby greatly reducing the frequency of disassembly and maintenance of the filter; By setting a bonding plate to block part of the mesh surface of the filter screen, the ink is prevented from moving through the part of the mesh surface, thereby forcing the ink to move along the inclined filter screen and enter the manifold through the unblocked mesh surface. 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 angle between the first mesh body and the inner peripheral surface of the manifold. An elastically foldable square frame and a flexibly foldable filter net are provided, and the second swing rod is driven to force the elastic telescopic rod to contract, so as to force the filter net to fold, that is, the filter net is in a relaxed state. Under the recoil effect of the ink, the filter net adaptively stretches according to the flow direction and kinetic energy of the ink, thereby reducing the pressure loss of the filter net to the ink, thereby improving the recoil effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the ink constant temperature circulation filtering mechanism of Example 1.

[0028] Figure 2 It is a schematic diagram of the triangular prism frame of Example 1 in the first working position.

[0029] Figure 3 Schematic diagram of the triangular prism frame of Example 1.

[0030] Figure 4 It is a partial schematic diagram of the triangular prism frame of Example 1 in the second working position.

[0031] Figure 5 It is a schematic diagram of the triangular prism frame of Example 1 in the second working position.

[0032] Figure 6 It is a schematic diagram of the triangular prism frame of Example 1 in the third working position.

[0033] Figure 7 It is a schematic diagram of the printing device of Example 1.

[0034] Figure 8 It is a schematic diagram of the triangular prism frame of Example 2 in the second working position.

[0035] Fig. 9 It is a schematic diagram of Example 3 for reflecting the transmission relationship between the third motor and the bonding plate.

[0036] Fig.10 It is a partial schematic diagram of the triangular prism frame of Example 3 in the second working position.

[0037] Fig.11 It is a schematic diagram of the triangular prism frame of Example 4.

[0038] Fig.12 It is a front view of the filter screen of Example 4.

[0039] Fig.13 Schematic diagram of the second swing arm and the fourth motor of Example 4.

[0040] Fig.14 It is a partial schematic diagram of the triangular prism frame of Example 4 in the second working position.

[0041] Description of reference numerals: 1. manifold; 2. triangular prism frame; 3. filter screen; 5. fluid delivery assembly; 10. oil tank; 100. printer body; 101. inlet pipe; 102. shunt pipe; 103. outlet pipe; 104. circulation pump; 105. first switch valve; 106. second switch valve; 11. cover plate; 12. guide screen; 13. third motor; 131. first rotating shaft; 132. first swing rod; 133. fixed shaft; 134. 4. Laminating plate; 15. Fourth motor; 151. Second swing arm; 21. Bottom plate; 211. Upright column; 22. Upright pole; 23. Cross bar; 24. Support plate; 25. Collecting plate; 26. Vertical pipe; 27. Vertical pole; 28. Elastic telescopic rod; 31. First net body; 32. Second net body; 33. Net sleeve; 51. Second motor; 52. Paddle; 53. Third rotating shaft; 61. First motor; 62. Fourth rotating shaft; 63. Annular cam; 64. Nut. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1 -Attached Fig.14This application is described in further detail.

[0043] Example 1, Example 1 discloses an ink constant temperature circulation filtering mechanism, such as Figure 1 , Figure 2 and Figure 3 As shown, the ink constant temperature circulation filtering 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 confluence tube 1, a triangular prism frame 2, an angle control component and two filter screens 3.

[0044] A heating structure (not shown in the figure) is provided in the oil tank 10. The heating structure may be an electric heating wire or a heating tube with hot oil passing therethrough. The heating structure is used to heat the ink in the oil tank 10 so that the ink maintains a relatively stable temperature. The circulating pump 104 is used to apply circulating flow power to the ink.

[0045] One end of the inlet pipe 101 and the outlet pipe 103 are respectively communicated with the two sides of the oil tank 10 . The inlet pipe 101 is provided with a first switch valve 105 , and the outlet pipe 103 is provided with a second switch valve 106 .

[0046] like Figure 2 As shown, two shunt tubes 102 are arranged side by side, and one end of the two shunt tubes 102 is commonly connected to the outlet end of the inlet tube 101. Three openings are penetrated through the outer circumference of the manifold 1, and the three openings are respectively connected to the end of the discharge pipe 103 and the end of the two shunt tubes 102.

[0047] like Figure 2 As shown, the two branch tubes 102 are both provided with a fluid conveying component 5, and the conveying directions of the fluid conveying components 5 of the two branch tubes 102 are the same, that is, both drive the ink to move toward the direction of the collecting tube 1, and the start-up time of the fluid conveying components 5 of the two branch tubes 102 is staggered, that is, when one of the fluid conveying components 5 is started, the other fluid conveying component 5 is not started.

[0048] Specifically, the fluid conveying component 5 includes a paddle 52 and a second motor 51. The paddle 52 is located in the inner cavity of the shunt tube 102. A third rotating shaft 53 is rotatably connected in the shunt tube 102. The paddle 52 is fixed to the third rotating shaft 53. The second motor 51 is fixed to the outside of the shunt tube 102. The output shaft of the second motor 51 penetrates into the shunt tube 102. The output shaft of the second motor 51 cooperates with two bevel gears to transmit torque to the third rotating shaft 53.

[0049] like Figure 3 , Figure 4 As shown, one end of the busbar 1 is closed, and the other end of the busbar 1 is detachably provided with a cover plate 11 (see Figure 1The triangular prism frame 2 is located in the collector tube 1, and the triangular prism frame 2 includes a bottom plate 21 and two square frames, wherein the bottom plate 21 is triangular, and the bottom plate 21 is attached to the inner bottom of the collector tube 1, and a support plate 24 is fixed to the bottom plate 21.

[0050] like Figure 3 , Figure 4 As shown, the square frame includes two vertical poles 22 and two horizontal poles 23, and the two vertical poles 22 and the two horizontal poles 23 serve as the four sides of the square frame. The two horizontal poles 23 are arranged up and down, and one of the horizontal poles 23 is fixed to the side of the bottom plate 21. The vertical pole 22 is parallel to the axis of the collector tube 1, and the two ends of the vertical pole 22 are respectively fixed to the ends of the two horizontal poles 23, and the outer circumference of the vertical pole 22 is tangent to the inner circumference of the collector tube 1.

[0051] The filter screen 3 is installed in a square frame, that is, the filter screen 3 is square, and the four sides of the filter screen 3 are respectively fixed to two vertical rods 22 and two horizontal rods 23, and the two filter screens 3 are respectively arranged corresponding to the ports of the two diversion pipes 102.

[0052] The angle control assembly 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 diverter tube 102; one of the filter screens 3 is set as the first mesh body 31, and the other filter screen 3 is set as the second mesh body 32. When the triangular prism frame 2 is located at the first position (see Figure 2 ), the surfaces of the two filter screens 3 are respectively perpendicular to the axis of the corresponding diverter pipe 102; when the triangular prism frame 2 is located at the second station (see Figure 5 ), the angle between the axis of the first mesh body 31 and the shunt pipe 102 is 100°-130°; when the triangular prism frame 2 is located at the third station (see Figure 6 ), the angle between the second mesh body 32 and the axis of the shunt tube 102 is 100°-130°.

[0053] Specifically, the angle control assembly includes a first motor 61, which is installed on the outer bottom of the busbar 1. The output shaft of the first motor 61 passes through the center of the busbar 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 a ring protrusion 63. The fourth rotating shaft 62 passes through the support plate 24, and the fourth rotating shaft 62 is threadedly connected with a nut 64. The nut 64 and the ring protrusion 63 press the support plate 24 to achieve the fixation of the first motor 61 and the base plate 21. In order to increase the fixing friction, a rubber pad can be set on the ring protrusion 63.

[0054] Furthermore, in this embodiment, one of the vertical poles 22 of the square frame is fixedly connected with an arc-shaped collecting plate 25, the outer arc surface of the collecting plate 25 is attached to the inner circumference of the collector tube 1, and an angle area for collecting impurities is formed between the inner arc surface of the collecting plate 25 and the surface of the filter screen 3. In other embodiments, the collecting plate 25 may not be required, and the angle between the filter screen 3 and the inner circumference of the collector tube 1 may also serve to collect impurities.

[0055] Embodiment 1 also discloses a printing device, such as Figure 7 As shown, the printing device includes a printing machine body 100 and the above-mentioned ink constant temperature circulation filtering mechanism.

[0056] Example 1 also discloses a decorative paper printing process using the above-mentioned printing device, and the decorative paper printing process includes the following steps: the heating structure heats the ink in the oil tank 10, at which time the triangular prism frame 2 is located at the first workstation, and the circulation pump 104 is started to drive the ink to circulate along the path of the oil tank 10, the inlet pipe 101, the diversion pipe 102, the manifold 1, the discharge pipe 103, and the oil tank 10. During this process, the filter screen 3 intercepts and filters impurities in the ink.

[0057] The decorative paper is placed in the printer body 100 to be printed.

[0058] When it is necessary to clear 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 106 are closed, so that the two branch pipes 102 and the confluence tube 1 form a closed-loop flow channel, and the angle control component moves the triangular prism frame 2 to the second station and the third station successively.

[0059] When the triangular prism frame 2 moves from the first station to the second station, one of the fluid delivery components 5 is started (the other fluid delivery component 5 is not 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 3 and carry the impurities along the shunt pipe 102 to the other filter screen 3 ( Figure 4 The solid arrow in the middle is the direction of ink flow, and the hollow arrow is the direction of impurity movement). Since the angle between the filter 3 and the axis of the diverter tube 102 is 100°-130°, part of the ink carrying impurities will move along the inclined surface of the filter 3, and the impurities carried by the ink will gradually gather in the angle area between the filter 3 and the inner arc surface of the collection plate 25.

[0060] In this way, not only can the two filter screens 3 be cleared, but also the impurities can be gathered and collected to reduce the secondary clogging of the filter screens 3 by the impurities, thereby greatly reducing the frequency of disassembly and maintenance of the filter screens 3.

[0061] Moreover, during the process of the triangular prism frame 2 moving from the first station to the second station and the third station successively, the angle of the filter screen 3 relative to the axis of the diverter tube 102 is constantly changing, that is, the flushing angle of the ink on the filter screen 3 is constantly changing, so as to reduce the recoil dead angle, thereby greatly improving the recoil clearing effect and completeness.

[0062] Embodiment 2, embodiment 2 is different from embodiment 1 in that, Figure 8 As shown, the collecting plate 25 is made of rubber, and the side of the collecting plate 25 away from the vertical rod 22 is set as a free side.

[0063] An inclined guide net 12 is fixed to the pipe opening of the shunt pipe 102 facing the collector 1 . The mesh size of the guide net 12 is larger than the mesh size of the filter net 3 . The guide net 12 is made of metal and extends into the collector 1 .

[0064] When the triangular prism frame 2 moves from the first station to the second station or the 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 elastically deforms and shifts toward the filter net 3. When the triangular prism frame 2 is located at the second station or the 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 the single side of the filter net 3 as much as possible, thereby improving the stability of the gathered impurities.

[0065] Embodiment 3, embodiment 3 is different from embodiment 1 in that, Fig. 9 , Fig.10 As shown, the ink constant temperature circulation filtration mechanism also includes a bonding plate 134, a third motor 13, a first rotating shaft 131, a fixed shaft 133 and a first swing rod 132. The first rotating shaft 131 and the fixed shaft 133 are both parallel to the axis of the collector tube 1, and the first rotating shaft 131 and the fixed shaft 133 are not colinear. The third motor 13 is installed on the upper surface of the cover plate 11, and 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 rod 132 is perpendicular to the first rotating shaft 131, and the two ends of the first swing rod 132 are fixedly connected to the upper end of the fixed shaft 133 and the lower end of the first rotating shaft 131 respectively.

[0066] A through hole is formed in the middle of the bonding plate 134 , and the fixing shaft 133 passes through the through hole, so that the bonding plate 134 and the fixing shaft 133 are relatively rotatable.

[0067] When the triangular prism frame 2 is located at the second station or the 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 rotating shaft 131 through the first rotating shaft 131, and the bonding plate 134 is bonded to the mesh surface of the filter screen 3, that is, part of the mesh of the filter screen 3 is blocked to prevent the ink from moving through the part of the mesh, and the mesh of the filter screen 3 that is not bonded by the bonding plate 134 is arranged opposite to the inner circumferential surface of the collector tube 1, so that the ink moves along the inclined filter screen 3 and enters the collector tube 1 through the unblocked mesh. In this process, the ink will push the impurities to move more stably, 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 collector tube 1.

[0068] It should be noted that during the process of switching the working position of the triangular prism frame 2, the first swing arm 132 can adjust the position of the bonding plate 134 to avoid the filter screen 3, that is, to reduce the interference with the expansion of the filter screen 3. The first swing arm 132 can also move adaptively so that during the process of switching the working position of the triangular prism frame 2, the bonding plate 134 can be in real time in contact with the mesh surface of the filter screen 3.

[0069] Embodiment 4, embodiment 4 is different from embodiment 1 in that, Fig.11 , Fig.12 As shown, two vertices of the bottom plate 21 close to the discharge pipe 103 are respectively fixed with upright posts 211, and the upright posts 211 are parallel to the axis of the manifold 1. The square frame includes a vertical pipe 26, a vertical rod 27 and two elastic telescopic rods 28, and the two elastic telescopic rods 28 are arranged up and down, and the elastic telescopic rods 28 include a rod body and a tube body (not marked in the figure), and the tube body is slidably sleeved on the outside of the rod body, and a spring (not marked in the figure) is arranged in the tube body, and the elastic force of the spring is used to force the rod body to axially move away from the tube body.

[0070] The vertical pipe 26 and the vertical rod 27 are parallel to the axis of the manifold 1, the elastic telescopic rod 28 is perpendicular to the vertical pipe 26, the vertical pipe 26 is rotatably sleeved on the outside of the column 211, and the two ends of the elastic telescopic rod 28 are respectively fixed to the ends of the vertical pipe 26 and the vertical rod 27. The filter screen 3 is a nylon net, and two opposite sides of the filter screen 3 are respectively fixed to the vertical pipe 26 and the vertical rod 27, and the other two opposite sides of the filter screen 3 are fixed with mesh sleeves 33, and the two mesh sleeves 33 are respectively sleeved on the outside of the two elastic telescopic rods 28.

[0071] In the first position, 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 circumference of the collector tube 1 and the side of the bottom plate 21, so that the elastic telescopic rod 28 located below fits the side of the bottom plate 21, and the filter screen 3 is in a taut state.

[0072] like Fig.13As shown, a fourth motor 15 is fixed to the upper surface of the cover plate 11 , and the output shaft of the fourth motor 15 is parallel to the axis of the busbar 1 . The output shaft of the fourth motor 15 passes through the cover plate 11 and is fixed with a second swing rod 151 , which is arranged perpendicular to the output shaft of the fourth motor 15 .

[0073] When the triangular prism frame 2 is in the second position or the third position (see Fig.14 ), when the fourth motor 15 drives the second swing arm 151 to swing toward the shunt pipe 102, the end of the second swing arm 151 abuts against the elastic telescopic rod 28 above to drive the square frame to deflect in the direction away from the bottom plate 21. Since the vertical rod 27 is always abutted against the inner circumference of the confluence tube 1, the elastic telescopic rod 28 gradually contracts during this process, and the distance between the vertical rod 27 and the vertical pipe 26 is shortened to force the filter screen 3 to fold, that is, the filter screen 3 is in a relaxed state. Under the recoil effect of the ink, the filter screen 3 adaptively stretches according to the flow direction and kinetic energy of the ink, thereby reducing the pressure loss of the filter screen 3 to the ink, thereby improving the recoil effect.

[0074] It should be noted that, during the process of switching the working positions of the triangular prism frame 2 , the fourth motor 15 can adjust the position of the second swing rod 151 to avoid the filter screen 3 , that is, to reduce the expansion interference with the filter screen 3 .

[0075] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An ink constant temperature circulation filtering mechanism, characterized in that: The invention comprises an oil tank (10), a circulation pump (104), an inlet pipe (101), an outlet pipe (103), an arc-shaped shunt pipe (102), a manifold (1), a triangular prism frame (2), an angle control assembly and two filter screens (3). A heating structure is arranged in the oil tank (10), wherein one end of the inlet pipe (101) and the outlet pipe (103) are respectively connected to two sides of the oil tank (10), and the two shunt pipes (102) are arranged side by side, and one end of the two shunt pipes (102) is connected to the inlet pipe (101) and the outlet pipe (103). The outlet end of the pipe (101) is connected, and three openings are provided through the outer peripheral surface of the confluence tube (1), and the three openings are respectively connected to the end of the discharge pipe (103) and the end of the two diversion tubes (102); the triangular prism frame (2) is located in the confluence tube (1), and the three side edges of the triangular prism frame (2) are all in contact with the inner peripheral surface of the confluence tube (1); the two filter screens (3) are respectively arranged on two side surfaces of the triangular prism frame (2), and the two filter screens (3) correspond to the two diversion tubes (102) respectively. The inlet pipe (101) is provided with a first switch valve (105), the two branch pipes (102) are each provided with a fluid delivery assembly (5), and the outlet pipe (103) is provided with a second switch valve (106); the angle control assembly 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 branch pipe (102); one of the filter screens (3) is set as the first mesh body (31), and the other filter screen ( 3) is set as the second mesh body (32), when the triangular prism frame (2) is located at the first working position, the surfaces of the two filter meshes (3) are respectively perpendicular to the axis of the corresponding diversion pipe (102); when the triangular prism frame (2) is located at the second working position, the angle between the first mesh body (31) and the axis of the diversion pipe (102) is 100°-130°; when the triangular prism frame (2) is located at the third working position, the angle between the second mesh body (32) and the axis of the diversion pipe (102) is 100°-130°.

2. The ink constant temperature circulation filtering mechanism according to claim 1, characterized in that: The two side edges of the triangular prism frame (2) are fixedly connected with an arc-shaped collecting plate (25), the outer arc surface of the collecting plate (25) is fitted to the inner peripheral surface of the collecting tube (1), and an angle area for collecting impurities is formed between the inner arc surface of the collecting plate (25) and the surface of the filter screen (3).

3. The ink constant temperature circulation filtering 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 a free side; the pipe mouth of the diversion pipe (102) facing the confluence tube (1) is fixed with an inclined guide net (12), and the guide net (12) is made of metal; when the triangular prism frame (2) moves from the first station to the second station or the 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) elastically deforms and deflects toward the filter net (3); when the triangular prism frame (2) is located at the second station or the third station, the free side of the collecting plate (25) abuts against the mesh surface of the filter net (3).

4. The ink constant temperature circulation filtering mechanism according to claim 1 or 2, characterized in that: The invention also comprises a bonding plate (134), a third motor (13), a first rotating shaft (131), a fixed shaft (133) and a first swing rod (132); the first rotating shaft (131) and the fixed shaft (133) are both parallel to the axis of the collector tube (1); the third motor (13) is used to drive the first rotating shaft (131) to rotate; the first swing rod (132) is perpendicular to the first rotating shaft (131); the two ends of the first swing rod (132) are respectively fixedly connected to the fixed shaft (133) and the first rotating shaft (131); a middle part of the bonding plate (134) is provided with a There is a through hole, through which a fixed shaft (133) passes, and a bonding plate (134) and the fixed shaft (133) are arranged to rotate relative to each other; when the triangular prism frame (2) is located at the second station or the 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 rotating shaft (131) through the first rotating shaft (131), and the bonding plate (134) is bonded to the mesh surface of the filter screen (3), and the mesh of the filter screen (3) not bonded by the bonding plate (134) is arranged to face the inner peripheral surface of the collector tube (1).

5. The ink constant temperature circulation filtering mechanism according to claim 1 or 2, characterized in that: The filter screen (3) is a nylon screen; one end of the collector tube (1) is closed, and the other end of the collector tube (1) is detachably provided with a cover plate (11); the triangular prism frame (2) comprises a bottom plate (21) and two square frames, wherein the bottom plate (21) is a triangle, and the bottom plate (21) is attached to the inner bottom of the collector tube (1); the angle control assembly comprises a first motor (61), the first motor (61) is installed on the outer bottom of the collector tube (1), and the output shaft of the first motor (61) passes through the center of the collector tube (1) and is connected to the bottom plate (21). ) are detachably connected; two vertices of the bottom plate (21) close to the discharge pipe (103) are respectively fixed with upright posts (211), and the upright posts (211) are parallel to the axis of the collector tube (1); the square frame comprises a upright tube (26), a vertical rod (27) and two elastic telescopic rods (28), the upright tube (26) and the vertical rod (27) are both parallel to the axis of the collector tube (1), the elastic telescopic rod (28) is perpendicular to the upright tube (26), the upright tube (26) is rotatably sleeved on the outside of the upright posts (211), and the elastic telescopic rod (28) is perpendicular to the upright tube (26), and the upright tube (26) is rotatably sleeved on the outside of the upright posts (211). The two ends of the filter screen (8) are respectively fixed to the ends of the vertical pipe (26) and the vertical rod (27), and one of the elastic telescopic rods (28) is used to fit the side of the bottom plate (21); two opposite sides of the filter screen (3) are respectively fixed to the vertical pipe (26) and the vertical rod (27), and the other two opposite sides of the filter screen (3) are fixed with mesh sleeves (33), and the two mesh sleeves (33) are respectively sleeved on the outside of the two elastic telescopic rods (28), and the elastic force of the elastic telescopic rods (28) is used to force the vertical rod (27) to abut against the collector tube (1 ) inner circumferential surface; a fourth motor (15) is fixed on the outer side of the confluence tube (1), the output shaft of the fourth motor (15) is parallel to the axis of the confluence tube (1), a second swing rod (151) is vertically fixed to the output shaft of the fourth motor (15), 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 shunt tube (102), the second swing rod (151) drives the square frame to deflect in a direction away from the bottom plate (21) and the elastic telescopic rod (28) contracts.

6. The ink constant temperature circulation filtering mechanism according to claim 1, characterized in that: One end of the busbar (1) is closed, and the other end of the busbar (1) is detachably provided with a cover plate (11); the triangular prism frame (2) comprises a bottom plate (21) and two square frames, wherein the bottom plate (21) is triangular and fits the inner bottom of the busbar (1); the angle control assembly comprises a first motor (61), the first motor (61) is mounted on the outer bottom of the busbar (1), and the output shaft of the first motor (61) passes through the busbar (1). ) and is detachably connected to the bottom plate (21); the square frame comprises two vertical rods (22) and two horizontal rods (23), one of the horizontal rods (23) is fixed to the side of the bottom plate (21), the vertical rod (22) is parallel to the axis of the collector tube (1), the two ends of the vertical rod (22) are respectively fixed to the ends of the two horizontal rods (23), the surface of the vertical rod (22) is tangentially in contact with the inner circumference of the collector tube (1), and the filter screen (3) is installed in the square frame.

7. The ink constant temperature circulation filtering mechanism according to claim 1, characterized in that: The fluid conveying component (5) comprises a paddle (52) and a second motor (51); the paddle (52) is located in the inner cavity of the shunt tube (102), and the paddle (52) and the shunt tube (102) are arranged to rotate relative to each other; the second motor (51) drives the paddle (52) to rotate through gear transmission.

8. A printing device, characterized in that: It comprises the ink constant temperature circulation filtering mechanism as claimed in claim 1 and a printing machine body (100).

9. A decorative paper printing process using the printing device according to claim 8, characterized in that: The following steps are involved: 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), the inlet pipe (101), the diversion pipe (102), the manifold (1), the outlet pipe (103), and the oil tank (10), and the decorative paper is placed in the printing machine body (100) to perform printing; when it is necessary to clear the impurities in the filter screen (3), the circulation pump (104) is closed, and the first switch valve (105) and the second switch valve (106) are turned on. The switch valve (106) is closed, so that the two branch pipes (102) and the confluence tube (1) form a closed-loop flow channel, and the angle control component moves the triangular prism frame (2) to the second station and the third station successively. When the triangular prism frame (2) is located at the second station or the third station, one of the fluid conveying components (5) 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 (3) and carry the impurities to converge at the angle between the other filter screen (3) and the inner peripheral surface of the confluence tube (1).

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