A drying box for gravure printing machine

Abstract

The present invention relates to the technical field of drying ovens, and discloses a drying oven for a gravure printing press, including a buffer-type drying mechanism and a ventilated ball-joint mechanism. The drying oven for a gravure printing press can adjust the relative angle between the drying gas and the handwriting, so that the flow direction of the drying gas and the handwriting present a ninety-degree angle, so that the heat and kinetic energy in the drying gas can act on the handwriting to the maximum extent, thereby improving the drying effect per unit amount of drying gas discharged, and at the same time improving the drying efficiency. In addition, the device can use the bottom center point of the buffer-type drying mechanism as the center of rotation, and has the characteristics of high angle adjustment sensitivity and wide range of activities, thereby improving the efficiency and adjustable range of angle adjustment.

Description

Technical Field

[0001] The invention relates to the technical field of drying boxes, in particular to a drying box for a gravure printing machine. Background Art

[0002] Gravure printing is a common printing process that requires drying of printed materials to ensure that the ink dries quickly and avoids blurring and color mixing. Drying oven is one of the equipment used for this purpose, which can quickly dry the material printed with wet ink in a short time.

[0003] For example, a Chinese patent with publication number "CN117124719A" discloses "a drying box for a gravure printing machine", whose main structure includes a box body, and the height can be automatically adjusted by a hydraulic cylinder, so that the connecting column at the telescopic end drives the sheath to roll on the surface of the cardboard to roll the edge of the cardboard, and under the connection of the heating pump, the heating roller rod can quickly smooth the warped edge during rolling, and under the protection of the sheath, the temperature will not be too high, so that the dried cardboard can be rolled quickly, and the frame rod at the front end of the two connecting columns will drive the front end multiple groups of rollers to roll on the surface of the cardboard during the walking process, so that the cardboard can be positioned to prevent the cardboard from shifting during the rolling process due to the size of the cardboard, so as to ensure the treatment effect of the cardboard, and the connection of the suction pump allows the dry gas above to be closer to the surface of the cardboard, so as to accelerate the drying rate of the cardboard.

[0004] However, in the actual drying process, since the angle between the dry flowing gas and the printed material is not perpendicular to the printed material, the relative movement efficiency of the dry gas to the handwriting is low, thus resulting in low effective drying effect of the dry gas on the raised words on the surface of the printed material. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a drying box for a gravure printing machine, which can adjust the relative angle between drying gas and writing, so that the flow direction of the drying gas and the writing are at an angle of ninety degrees, so that the heat and kinetic energy in the drying gas can act on the writing to the maximum extent, thereby improving the drying effect per unit amount of drying gas discharged, and at the same time improving the drying efficiency. In addition, the device can use the bottom center point of the cache drying mechanism as the center of rotation, and has the characteristics of high angle adjustment sensitivity and a wide range of activity, thereby improving the efficiency and adjustable range of angle adjustment, and solving the above-mentioned technical problems.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a gravure printing machine drying box, comprising a horizontal support frame with a lower center fixed opening in the center, a rectangular box located just above the lower center fixed opening, a rectangular drying chamber arranged inside the rectangular box, through openings for printed materials arranged on two symmetrical vertical surfaces of the rectangular box, exhaust ports arranged on the other two symmetrical vertical surfaces of the rectangular box, and an upper center fixed opening arranged at the bottom end of the rectangular box, and also comprising a cache-type drying mechanism, wherein a rectangular hollow shell capable of allowing dry gas to flow toward handwriting is arranged inside, and a sheet-like elastic air membrane embedded inside the rectangular hollow shell and expanding downward after being subjected to gas pressure, thereby achieving a gas caching effect; and a ventilated ball-joint mechanism, wherein a hemispherical shell fixedly installed in the middle of the bottom surface of the rectangular hollow shell and capable of allowing gas to flow toward the inside of the rectangular hollow shell, a rotating ball head placed inside the hemispherical shell and capable of rotating relative to the hemispherical shell to achieve angle adjustment, and an arc-shaped elastic membrane embedded inside the hemispherical shell and wrapped around a partial spherical surface of the rotating ball head after being subjected to liquid pressure, thereby fixing the rotating ball head.

[0007] Preferably, the cache drying mechanism includes a rectangular hollow shell, a gas cache cavity is arranged inside the rectangular hollow shell, a raised pipe body of an integrated structure and protruding upward is arranged at the center of the bottom end face of the gas cache cavity, an outer embedding groove and an inner embedding groove are respectively arranged between the vertical surface of the rectangular hollow shell and the outer circumferential surface of the raised pipe body, a sheet-like elastic air film in a stretched state is embedded between the outer embedding groove and the inner embedding groove of the rectangular hollow shell and the raised pipe body, the sheet-like elastic air film divides the gas cache cavity into a lower cavity and an upper cavity which are not connected to each other, a No. 1 gas flow hole connecting the space below the rectangular hollow shell and the upper cavity is arranged inside the raised pipe body, a plurality of air vents connecting the space above it and the upper cavity are arranged on the upper end face of the rectangular hollow shell, and the outer vertical surface of the rectangular hollow shell is fixedly mounted inside the upper center fixed port.

[0008] Preferably, the air vents gradually increase in height from the printed material through-hole at the entrance to the printed material through-hole at the discharge position.

[0009] Preferably, the sheet-like elastic air membrane is a sheet-like structure made of a rubber material having ductility and elasticity, and the rubber material is sufficient to work stably at a temperature required for drying.

[0010] Preferably, the ventilated ball joint mechanism includes a hemispherical shell and a longitudinal hollow column, the top of the hemispherical shell is provided with a No. 1 fixing plate which is integrally structured with the hemispherical shell and fixedly mounted on the bottom surface of the rectangular hollow shell, the upper end of the No. 1 fixing plate is embedded with an annular sealing ring capable of preventing gas from leaking outward, the interior of the hemispherical shell is provided with a hemispherical cavity with an open bottom, the hemispherical shell is provided with an arc-shaped liquid flow cavity on the periphery of the hemispherical cavity, and the hemispherical shell is provided with a region between the inner side of the arc-shaped liquid flow cavity and the outer side of the hemispherical cavity There is an arc-shaped embedding groove, and the hemispherical shell is embedded with an arc-shaped elastic membrane inside the arc-shaped embedding groove. The hemispherical shell is provided with a rotatable rotating ball head inside the hemispherical cavity, and the bottom of the rotating ball head is provided with a No. 2 fixing plate with an integral structure therewith, and the center of the rotating ball head and the No. 2 fixing plate is provided with a No. 2 gas flow hole connecting the space below the No. 2 fixing plate and the space above the rotating ball head, and the top of the hemispherical shell is provided with a No. 3 gas flow hole connecting the space above it and the hemispherical cavity, and the interior of the longitudinal hollow column is provided with a longitudinal component active cavity.

[0011] Preferably, the top end of the longitudinal hollow column and the outer spherical surface of the hemispherical shell are fixedly connected by a curved connecting channel, and the curved connecting channel communicates the top end of the arc-shaped liquid flow chamber and the longitudinal component active chamber, the longitudinal hollow column is provided with a piston body capable of axially moving along the longitudinal component active chamber inside the longitudinal component active chamber, the bottom end of the piston body is fixedly installed with a push-pull rod that passes through the bottom structure of the longitudinal hollow column, the push-pull rod is provided with a helical spring in a compressed state on the outer periphery of the rod body located inside the longitudinal component active chamber, one end of the helical spring abuts against the bottom end face of the longitudinal component active chamber, and the other end abuts against the bottom end face of the piston body, the arc-shaped liquid flow chamber and the longitudinal component active chamber are filled with a buffer solution in a closed area between the arc-shaped elastic membrane and the piston body, and the elastic force of the helical spring acts on the outer surface of the arc-shaped elastic membrane through the transmission of the buffer solution.

[0012] Preferably, the structural radius of the rotating ball head matches the structural radius of the hemispherical cavity, and the structural radius of the rotating ball head is smaller than the depth of the hemispherical cavity.

[0013] Preferably, it also includes a variable frequency heating mechanism, which is internally provided with an induction coil that cooperates with a high-voltage frequency converter to generate a variable frequency magnetic field after injecting a high-frequency current, and a metal rod located in the center area of ​​the induction coil and heated after being affected by the variable frequency magnetic field.

[0014] Preferably, the variable frequency heating mechanism includes a longitudinal hollow shell made of non-metallic material and fixedly installed in the lower center fixing port, the top of the longitudinal hollow shell is provided with a No. 3 fixing plate which is an integral structure with it and fixedly installed at the bottom end of the No. 2 fixing plate, the center of the longitudinal hollow shell is provided with a longitudinal gas flow cavity with an open bottom end, the longitudinal hollow shell is provided with an equipment docking port at the bottom open end of the longitudinal gas flow cavity, the top of the longitudinal hollow shell is provided with a No. 4 gas flow hole connecting the top of the longitudinal gas flow cavity and the top of the longitudinal gas flow cavity, the longitudinal hollow shell is provided with an outer ring cylindrical cavity at the periphery of the longitudinal gas flow cavity, the longitudinal hollow shell is provided with an induction coil arranged in a spiral shape inside the outer ring cylindrical cavity, the two wiring terminals of the induction coil are respectively fixedly provided with a No. 1 wiring post and a No. 2 wiring post which pass through the corresponding structure of the longitudinal hollow shell, the longitudinal hollow shell is provided with a metal rod through a limit bracket which does not affect the upward flow of gas inside the longitudinal gas flow cavity, and both ends of the metal rod are provided with a tip structure which can reduce wind resistance.

[0015] Preferably, during operation, the No. 1 terminal and the No. 2 terminal are connected to the power output terminal of a high-voltage inverter that provides variable frequency current.

[0016] Compared with the prior art, the present invention provides a drying oven for a gravure printing machine, which has the following beneficial effects:

[0017] 1. The relative angle between the drying gas and the handwriting can be adjusted so that the flow direction of the drying gas forms a ninety-degree angle with the handwriting, so that the heat and kinetic energy in the drying gas can act on the handwriting to the maximum extent, thereby improving the drying effect per unit of drying gas emission and improving the drying efficiency. In addition, the device can use the bottom center point of the cache drying mechanism as the center of rotation, and has the characteristics of high angle adjustment sensitivity and wide range of activities, thereby improving the efficiency and adjustable range of angle adjustment.

[0018] 2. By setting up a buffer-type drying mechanism, when the gas pressure fluctuates greatly and the pressure is greater than the elastic strength of the sheet-like elastic air membrane, the sheet-like elastic air membrane will bend downward and expand. Since the gas is buffered, the dry gas flows through the air vent to the printed material in a more buffered form, reducing the instantaneous force of the dry gas on the ink in the handwriting. The dry gas will dry the ink in the handwriting through the air vent.

[0019] 3. By setting up a ventilated ball hinge mechanism, when the printed material is paper, it is often transmitted at a certain inclination angle. At this time, pull the push-pull rod downward, and then manually adjust the inclination angle of the rectangular hollow shell according to the actual required angle, so that the inclination angle of the rectangular hollow shell is parallel to the inclination angle of the paper, and then release the pulling force on the push-pull rod. Under the elastic action of the coil spring, the arc-shaped elastic membrane again keeps the rotating ball head in a fixed position, so that the dry gas can blow vertically to the handwriting. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A perspective view of the present invention;

[0021] Figure 2 is a three-dimensional cross-sectional view of the present invention;

[0022] Figure 3 It is a three-dimensional diagram of a rectangular box in the present invention;

[0023] Figure 4 It is a three-dimensional cross-sectional view of the cache drying mechanism in the present invention;

[0024] Figure 5 It is a three-dimensional cross-sectional view of the ventilated ball joint mechanism of the present invention;

[0025] Figure 6 It is a three-dimensional diagram of the assembly of the arc-shaped elastic membrane and the rotating ball head in the present invention;

[0026] Figure 7 It is a three-dimensional cross-sectional view of the variable frequency heating mechanism in the present invention;

[0027] Figure 8 It is a three-dimensional diagram of the induction coil in the present invention.

[0028] Among them: 1. horizontal support frame; 2. lower center fixing port; 3. rectangular box; 4. upper center fixing port; 5. printing material through port; 6. rectangular drying chamber; 7. exhaust port; 8. cache drying mechanism; 81. rectangular hollow shell; 82. gas cache chamber; 83. raised pipe body; 84. outer embedding groove; 85. inner embedding groove; 86. sheet elastic gas membrane; 87. No. 1 gas flow hole; 88. lower cavity; 89. upper cavity; 810. air vent; 9. ventilated ball joint mechanism; 91. hemispherical shell; 92. No. 1 fixing plate; 93. annular sealing ring; 94. arc liquid flow chamber; 95. arc embedding groove; 96. arc elastic membrane; 97. rotating ball head; 98 , No. 2 fixing plate; 99, No. 2 gas flow hole; 910, No. 3 gas flow hole; 911, curved connecting channel; 912, longitudinal hollow column; 913, longitudinal component movable cavity; 914, piston body; 915, push-pull rod; 916, spiral spring; 917, hemispherical cavity; 10, variable frequency heating mechanism; 101, longitudinal hollow shell; 102, No. 3 fixing plate; 103, longitudinal gas flow cavity; 104, outer ring cylindrical cavity; 105, No. 4 gas flow hole; 106, equipment docking port; 107, limit bracket; 108, metal rod; 109, tip structure; 1010, induction coil; 1011, No. 1 terminal; 1012, No. 2 terminal. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1 , Figure 2 and Figure 3A gravure printing machine drying box comprises a horizontal support frame 1 with a lower center fixed opening 2 in the center, a rectangular box 3 located just above the lower center fixed opening 2, a rectangular drying chamber 6 arranged inside the rectangular box 3, a printed material through-opening 5 arranged on two symmetrical facades of the rectangular box 3, an exhaust port 7 arranged on the other two symmetrical facades of the rectangular box 3, and an upper center fixed opening 4 arranged at the bottom end of the rectangular box 3. The device is placed at the rear moving end of the printed object, that is, the printed object after being printed by the gravure printing machine passes through the two printed material through-openings 5 ​​in sequence. At the same time, the printed object needs to enter from the end farther from the air vent 810 and be discharged outward from the end closer to the air vent 810, because the surface humidity of the handwriting that has just been printed is high, and the gas is farther away, which can reduce the negative impact of the gas on the ink. When the ink after preliminary drying will be gradually air-dried, therefore, the dry gas at the tail end of the movement can perform the final drying of the ink at a close distance, which is efficient.

[0031] In order to achieve the directional discharge and buffering function of dry gas, please refer to Figure 1 , Figure 2 and Figure 4 , it is necessary to set up a cache-type drying mechanism 8, which is provided with a rectangular hollow shell 81 inside which can make the dry gas flow toward the handwriting, and a sheet-like elastic air membrane 86 embedded in the rectangular hollow shell 81 and expanding downward after being subjected to gas pressure, thereby playing a gas caching effect. The gas enters the upper cavity 89 from the No. 1 gas flow hole 87. When the gas pressure is greater than the elastic strength of the sheet-like elastic air membrane 86, the sheet-like elastic air membrane 86 will bend downward and expand. Since the gas is cached, the dry gas flows toward the printed material through the air vent 810 in a more buffered form, reducing the instantaneous force of the dry gas on the ink in the handwriting. The dry gas will dry the ink in the handwriting through the air vent 810.

[0032] For the specific structure of the buffer type drying mechanism 8, please refer to Figure 4, comprising a rectangular hollow shell 81, wherein a gas buffer chamber 82 is arranged inside the rectangular hollow shell 81, wherein a protruding pipe body 83 of an integrated structure and protruding upward is arranged at the center of the bottom end face of the gas buffer chamber 82 of the rectangular hollow shell 81, an outer embedding groove 84 and an inner embedding groove 85 are respectively arranged between the vertical surface of the rectangular hollow shell 81 and the outer circumferential surface of the protruding pipe body 83, and a sheet-like elastic air film 86 in a stretched state is embedded between the outer embedding groove 84 and the inner embedding groove 85 of the rectangular hollow shell 81 and the protruding pipe body 83, wherein the sheet-like elastic air film 86 is a sheet-like structure made of a rubber material having extensibility and elasticity, and the rubber material is sufficient to be dry. It can work stably at the required temperature, and the sheet-like elastic air membrane 86 divides the gas buffer cavity 82 into a lower cavity 88 and an upper cavity 89 which are not connected to each other. The interior of the raised pipe body 83 is provided with a No. 1 gas flow hole 87 connecting the space below the rectangular hollow shell 81 and the upper cavity 89. The upper end surface of the rectangular hollow shell 81 is provided with a plurality of air holes 810 connecting the space above it and the upper cavity 89. In order to adjust the appropriate wind force according to the dryness of the handwriting, it is necessary to gradually increase the horizontal height of the air holes 810 from the printed material through hole 5 at the entrance to the printed material through hole 5 at the discharge position. The outer vertical surface of the rectangular hollow shell 81 is fixedly installed inside the upper center fixed port 4.

[0033] To adjust the wind direction of the printed material, please refer to Figure 1 , Figure 2 , Figure 5 and Figure 6 , a ventilated ball joint mechanism 9 is required, wherein a hemispherical shell 91 is fixedly mounted in the middle of the bottom surface of the rectangular hollow shell 81 and enables the gas to flow into the rectangular hollow shell 81, a rotating ball head 97 is placed inside the hemispherical shell 91 and can rotate relative to the hemispherical shell 91 to achieve angle adjustment, and an arc-shaped elastic membrane 96 is embedded in the hemispherical shell 91 and wrapped around a part of the spherical surface of the rotating ball head 97 after being subjected to liquid pressure, so that the rotating ball head 97 is fixed. When the printed object is paper When the paper is stretched, it is often transmitted at a certain inclination angle. At this time, the push-pull rod 915 is pulled downward to reduce the force of the buffer on the arc-shaped elastic membrane 96, and then the inclination angle of the rectangular hollow shell 81 is manually adjusted according to the actual required angle, so that the inclination angle of the rectangular hollow shell 81 is parallel to the inclination angle of the paper, and then the pulling force on the push-pull rod 915 is released. Under the elastic action of the coil spring 916, the arc-shaped elastic membrane 96 again keeps the rotating ball head 97 in a fixed position, so that the dry gas can be blown vertically to the handwriting.

[0034] For the specific structure of the ventilated ball joint mechanism 9, please refer to Figure 5 and Figure 6, including a hemispherical shell 91 and a longitudinal hollow column 912, the top of the hemispherical shell 91 is provided with a No. 1 fixing plate 92 which is an integral structure with it and fixedly mounted on the bottom surface of the rectangular hollow shell 81, the upper end of the No. 1 fixing plate 92 is embedded with an annular sealing ring 93 which can prevent gas from leaking outward, the interior of the hemispherical shell 91 is provided with a hemispherical cavity 917 with an open bottom, the hemispherical shell 91 is provided with an arc-shaped liquid flow cavity 94 on the periphery of the hemispherical cavity 917, the hemispherical shell 91 is provided with an arc-shaped embedding groove 95 in the area between the inner side of the arc-shaped liquid flow cavity 94 and the outer side of the hemispherical cavity 917, The hemispherical shell 91 is embedded with an arc-shaped elastic membrane 96 inside the arc-shaped embedding groove 95. The hemispherical shell 91 is provided with a rotatable rotating ball head 97 inside the hemispherical cavity 917. In order to prevent the components from detaching, it is necessary to make the structural radius of the rotating ball head 97 match the structural radius of the hemispherical cavity 917, and the structural radius of the rotating ball head 97 is smaller than the depth of the hemispherical cavity 917. The bottom of the rotating ball head 97 is provided with a second fixing plate 98 with an integral structure therewith, and the center of the rotating ball head 97 and the second fixing plate 98 is provided with a connecting space below the second fixing plate 98 and the space above the rotating ball head 97. The second gas flow hole 99, the top of the hemispherical shell 91 is provided with a third gas flow hole 910 connecting the space above it and the hemispherical cavity 917, the interior of the longitudinal hollow column 912 is provided with a longitudinal component active cavity 913, the top of the longitudinal hollow column 912 and the outer spherical surface of the hemispherical shell 91 are fixedly connected through a curved connecting channel 911, and the curved connecting channel 911 connects the arc-shaped liquid flow cavity 94 and the top of the longitudinal component active cavity 913, the longitudinal hollow column 912 is provided with a piston body 914 that can move axially along the longitudinal component active cavity 913, and the piston body 914 A push-pull rod 915 is fixedly installed at the bottom end, which passes through the bottom structure of the longitudinal hollow column 912. The push-pull rod 915 is provided with a compressed coil spring 916 on the outer periphery of the rod body inside the longitudinal component movable cavity 913. One end of the coil spring 916 abuts against the bottom end surface of the longitudinal component movable cavity 913, and the other end abuts against the bottom end surface of the piston body 914. The arc-shaped liquid flow cavity 94 and the longitudinal component movable cavity 913 are filled with a buffer solution in the closed area between the arc-shaped elastic membrane 96 and the piston body 914. The elastic force of the coil spring 916 is transmitted through the buffer solution and acts on the outer surface of the arc-shaped elastic membrane 96.

[0035] In order to heat the flowing gas to the required drying temperature, please refer to Figure 1 , Figure 2 , Figure 7 and Figure 8 , it is necessary to set up a variable frequency heating mechanism 10, which is internally provided with an induction coil 1010 that cooperates with a high-voltage frequency converter to generate a variable frequency magnetic field after injecting a high-frequency current, and a metal rod 108 located in the central area of ​​the induction coil 1010 and heated after being subjected to the variable frequency magnetic field. When working, the No. 1 terminal 1011 and the No. 2 terminal 1012 are connected to the power output end of a high-voltage frequency converter that provides variable frequency current, and then the device docking port 106 is connected to a fan that provides flowing gas, and the fan and the high-voltage frequency converter are started. At this time, the gas will flow upward through the longitudinal gas flow cavity 103. At the same time, the induction coil 1010 heats the metal rod 108 according to the variable frequency heating principle. The flowing gas near the metal rod 108 will be heated due to the heat transfer phenomenon, thereby forming dry gas, thereby realizing the heating of the flowing gas, so as to reach the temperature required for drying.

[0036] For the specific structure of the variable frequency heating mechanism 10, please refer to Figure 7 and Figure 8 , comprising a longitudinal hollow shell 101 made of non-metallic material and fixedly installed in the lower center fixing port 2, the top of the longitudinal hollow shell 101 is provided with a third fixing plate 102 which is an integral structure with it and fixedly installed at the bottom of the second fixing plate 98, the center of the longitudinal hollow shell 101 is provided with a longitudinal gas flow cavity 103 with an open bottom, the longitudinal hollow shell 101 is provided with a device docking port 106 at the bottom open end of the longitudinal gas flow cavity 103, the top of the longitudinal hollow shell 101 is provided with a fourth gas flow hole 105 which connects the top of the longitudinal gas flow cavity 103 and the top of the longitudinal gas flow cavity 103, the longitudinal The longitudinal hollow shell 101 is provided with an outer ring cylindrical cavity 104 on the periphery of the longitudinal gas flow cavity 103, and the longitudinal hollow shell 101 is equipped with a spirally arranged induction coil 1010 inside the outer ring cylindrical cavity 104, and the two terminal ends of the induction coil 1010 are respectively fixed with a No. 1 terminal 1011 and a No. 2 terminal 1012 which pass through the corresponding structure of the longitudinal hollow shell 101. The longitudinal hollow shell 101 is equipped with a metal rod 108 inside the longitudinal gas flow cavity 103 through a limiting bracket 107 which does not affect the upward flow of gas, and both ends of the metal rod 108 are provided with a tip structure 109 which can reduce wind resistance.

[0037] The specific working principle of the present invention is that, first, the device is placed at the rear moving end of the printed object, that is, the printed object after being printed by the gravure printing machine passes through the two printed object holes 5 in sequence, and at the same time, the printed object needs to enter from the end farther from the air vent 810 and be discharged from the end closer to the air vent 810, and then the first terminal 1011 and the second terminal 1012 are connected to the power output end of a high-voltage inverter that provides variable frequency current, and then the device connection port 106 is connected to a fan that provides flowing gas;

[0038] Start the fan and the high-voltage inverter. At this time, the gas will flow upward through the longitudinal gas flow cavity 103. At the same time, the induction coil 1010 heats the metal rod 108 according to the variable frequency heating principle. The flowing gas near the metal rod 108 will be heated due to the heat transfer phenomenon, thereby forming dry gas and flowing upward.

[0039] The gas enters the upper cavity 89 from the No. 1 gas flow hole 87. When the gas pressure is greater than the elastic strength of the sheet-like elastic air membrane 86, the sheet-like elastic air membrane 86 will bend downward and expand. Since the gas is buffered, the dry gas flows toward the printed material through the air vent 810 in a more buffered form, reducing the instantaneous force of the dry gas on the ink in the handwriting. The dry gas will dry the ink in the handwriting through the air vent 810.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drying box for a gravure printing machine, comprising a horizontal support frame (1) with a lower central fixing opening (2) arranged at the center, a rectangular box (3) located directly above the lower central fixing opening (2), a rectangular drying chamber (6) arranged inside the rectangular box (3), a through opening (5) for printed matter arranged on two symmetrical vertical surfaces of the rectangular box (3), an exhaust port (7) arranged on the other two symmetrical vertical surfaces of the rectangular box (3), and an upper central fixing opening (4) arranged at the bottom end of the rectangular box (3), characterized in that: Also includes, A cache drying mechanism (8) is provided with a rectangular hollow shell (81) capable of allowing drying gas to flow toward the writing, and a sheet-like elastic air membrane (86) embedded in the rectangular hollow shell (81) and expanding downwards after being subjected to gas pressure, thereby achieving a gas cache effect; A ventilated ball joint mechanism (9), wherein a hemispherical shell (91) is fixedly mounted on the middle of the bottom surface of the rectangular hollow shell (81) and is capable of allowing gas to flow into the interior of the rectangular hollow shell (81); a rotating ball head (97) is placed inside the hemispherical shell (91) and is capable of rotating relative to the hemispherical shell (91) to achieve angle adjustment; and an arc-shaped elastic membrane (96) is embedded in the hemispherical shell (91) and is wrapped around a portion of the spherical surface of the rotating ball head (97) after being subjected to liquid pressure, thereby fixing the rotating ball head (97); The cache drying mechanism (8) comprises a rectangular hollow shell (81), a gas cache chamber (82) is arranged inside the rectangular hollow shell (81), a raised pipe body (83) of an integrated structure and raised upward is arranged at the center of the bottom end surface of the gas cache chamber (82) of the rectangular hollow shell (81), an outer embedding groove (84) and an inner embedding groove (85) are respectively arranged between the vertical surface of the rectangular hollow shell (81) and the outer circumferential surface of the raised pipe body (83), and the rectangular hollow shell (81) and the raised pipe body (83) are arranged at the positions between the outer embedding groove (84) and the inner embedding groove (85). 5) is embedded with a sheet-like elastic air membrane (86) in a stretched state, the sheet-like elastic air membrane (86) divides the gas buffer cavity (82) into a lower cavity (88) and an upper cavity (89) which are not connected to each other, the interior of the protruding pipe body (83) is provided with a No. 1 gas flow hole (87) which connects the space below the rectangular hollow shell (81) and the upper cavity (89), the upper end surface of the rectangular hollow shell (81) is provided with a plurality of air vents (810) which connect the space above it and the upper cavity (89), and the outer vertical surface of the rectangular hollow shell (81) is fixedly mounted inside the upper center fixing port (4).

2. A gravure printing machine drying oven according to claim 1, characterized in that: The air permeability opening (810) gradually increases in height from the printed material through-opening (5) at the entry position to the printed material through-opening (5) at the discharge position.

3. A gravure printing machine drying oven according to claim 1, characterized in that: The sheet-like elastic air membrane (86) is a sheet-like structure made of a rubber material having extensibility and elasticity, and the rubber material is sufficient to work stably at the temperature required for drying.

4. A gravure printing machine drying oven according to claim 1, characterized in that: The ventilated ball joint mechanism (9) comprises a hemispherical shell (91) and a longitudinal hollow column (912); a first fixing plate (92) which is integrally structured with the hemispherical shell (91) and fixedly mounted on the bottom surface of the rectangular hollow shell (81) is disposed on the top of the hemispherical shell (91); an annular sealing ring (93) which can prevent gas from leaking outward is embedded in the upper end of the first fixing plate (92); a hemispherical cavity (917) with an open bottom is disposed inside the hemispherical shell (91); an arc-shaped liquid flow cavity (94) is disposed on the periphery of the hemispherical cavity (917); and an arc-shaped embedding groove (95) is disposed in the area between the inner side of the arc-shaped liquid flow cavity (94) and the outer side of the hemispherical cavity (917). ), the hemispherical shell (91) is embedded with an arc-shaped elastic membrane (96) inside the arc-shaped embedding groove (95), the hemispherical shell (91) is provided with a rotatable rotating ball head (97) inside the hemispherical cavity (917), the bottom of the rotating ball head (97) is provided with a second fixing plate (98) with an integral structure therewith, the center of the rotating ball head (97) and the second fixing plate (98) is provided with a second gas flow hole (99) connecting the space below the second fixing plate (98) and the space above the rotating ball head (97), the top of the hemispherical shell (91) is provided with a third gas flow hole (910) connecting the space above it and the hemispherical cavity (917), and the interior of the longitudinal hollow column (912) is provided with a longitudinal component active cavity (913).

5. A drying oven for a gravure printing machine according to claim 4, characterized in that: The top end of the longitudinal hollow column (912) and the outer spherical surface of the hemispherical shell (91) are fixedly connected via a curved connecting channel (911), and the curved connecting channel (911) communicates with the top end of the arc-shaped liquid flow chamber (94) and the longitudinal component movable chamber (913). The longitudinal hollow column (912) is provided with a piston body (914) capable of axial movement along the longitudinal component movable chamber (913) inside the longitudinal component movable chamber (913). The bottom end of the piston body (914) is fixedly provided with a push-pull rod (915) penetrating the bottom structure of the longitudinal hollow column (912). The push-pull rod (915) is provided to the bottom end of the piston body (914). 5) A helical spring (916) in a compressed state is placed on the outer periphery of the rod body located inside the longitudinal component movable chamber (913), one end of the helical spring (916) abuts against the bottom end surface of the longitudinal component movable chamber (913), and the other end abuts against the bottom end surface of the piston body (914), and the arc-shaped liquid flow chamber (94) and the longitudinal component movable chamber (913) are filled with a buffer solution in a closed area located between the arc-shaped elastic membrane (96) and the piston body (914), and the elastic force of the helical spring (916) is transmitted through the buffer solution and acts on the outer surface of the arc-shaped elastic membrane (96).

6. A drying oven for a gravure printing machine according to claim 5, characterized in that: The structural radius of the rotating ball head (97) matches the structural radius of the hemispherical cavity (917), and the structural radius of the rotating ball head (97) is smaller than the depth of the hemispherical cavity (917).

7. A drying oven for a gravure printing machine according to claim 5, characterized in that: It also comprises a variable frequency heating mechanism (10), which is provided with an induction coil (1010) which cooperates with a high-voltage frequency converter and generates a variable frequency magnetic field after injecting a high-frequency current, and a metal rod (108) which is located in the center area of ​​the induction coil (1010) and is heated after being acted upon by the variable frequency magnetic field.

8. A drying oven for a gravure printing machine according to claim 7, characterized in that: The variable frequency heating mechanism (10) comprises a longitudinal hollow shell (101) made of non-metallic material and fixedly mounted in the lower center fixing port (2); a third fixing plate (102) which is integrally structured with the longitudinal hollow shell (101) and fixedly mounted at the bottom end of the second fixing plate (98) is arranged at the top end of the longitudinal hollow shell (101); a longitudinal gas flow cavity (103) whose bottom end is open is arranged at the center of the longitudinal hollow shell (101); a device docking port (106) is arranged at the bottom open end of the longitudinal gas flow cavity (103); a fourth gas flow hole (105) which communicates with the top end of the longitudinal gas flow cavity (103) and the top end of the longitudinal gas flow cavity (103) is arranged at the top of the longitudinal hollow shell (101); The longitudinal hollow shell (101) is provided with an outer ring cylindrical cavity (104) located on the periphery of the longitudinal gas flow cavity (103); the longitudinal hollow shell (101) is provided with an induction coil (1010) arranged in a spiral shape inside the outer ring cylindrical cavity (104); two terminal ends of the induction coil (1010) are respectively fixedly provided with a first terminal post (1011) and a second terminal post (1012) penetrating the corresponding structure of the longitudinal hollow shell (101); the longitudinal hollow shell (101) is provided with a metal rod (108) located inside the longitudinal gas flow cavity (103) via a limit bracket (107) that does not affect the upward flow of gas; and both ends of the metal rod (108) are provided with a tip structure (109) that can reduce wind resistance.

9. A drying oven for a gravure printing machine according to claim 8, characterized in that: When in operation, the first terminal (1011) and the second terminal (1012) are connected to the power output end of a high-voltage frequency converter that provides variable frequency current.

Images