Temperature control device for a web offset printing press

Abstract

The application discloses a temperature control device for a web offset press, which comprises an upper box body and a lower box body arranged oppositely, and semiconductor refrigerating sheets are arranged in the upper box body and the lower box body; the upper box body and the lower box body are provided with not less than two air inlets and not less than two air outlets; axial flow fans are arranged on the air inlets and the air outlets; part of the air outlets of the upper box body and the lower box body are opposite to a paper path of the web offset press; another part of the air outlets of the upper box body is opposite to a rubber blanket on a top rubber cylinder; another part of the air outlets of the lower box body is opposite to a rubber blanket on a bottom rubber cylinder; part of the air inlets of the upper box body and the lower box body are opposite to cold surfaces of the semiconductor refrigerating sheets; and the other part of the air inlets of the upper box body and the lower box body are opposite to hot surfaces of the semiconductor refrigerating sheets. The application solves the problems of temperature rise of the rubber blanket surface and temperature control of the dried paper.

Description

Technical Field

[0001] This invention belongs to the technical field of web offset printing presses, and relates to a temperature control device for web offset printing presses. Background Technology

[0002] During prolonged printing, the surface temperature of the rubber sheet on a web offset printing press rises over time due to friction between the rubber sheets. Excessive temperature affects the durability of the rubber sheet and impacts print quality. Currently, domestic web offset printing presses generally use cooling water to circulate through the ink rollers, aiming to lower the ink temperature reaching the rubber sheet surface. However, this method can easily lead to slow ink drying and ink smudging on the printed product, further affecting print quality. Summary of the Invention

[0003] The purpose of this invention is to provide a temperature control device for a web offset printing press, which solves the problems of temperature rise on the surface of the rubber sheet and temperature control of the paper after printing and drying.

[0004] The technical solution adopted in this invention is a temperature control device for a web offset printing press, which is installed at the upper and lower rubber rollers of the web offset printing press. It includes an upper housing and a lower housing arranged opposite each other. Both the upper and lower housings are equipped with semiconductor cooling chips. Each of the upper and lower housings has at least two air inlets and at least two air outlets. Axial flow fans are installed at both the air inlets and outlets. A portion of the air outlets of the upper and lower housings are opposite to the paper path of the web offset printing press, another portion of the air outlets of the upper housing are opposite to the rubber sheet on the upper rubber roller, and another air outlet of the lower housing is opposite to the rubber sheet on the lower rubber roller. A portion of the air inlets of the upper and lower housings are opposite to the cold side of the semiconductor cooling chips, and another portion of the air inlets are opposite to the hot side of the semiconductor cooling chips.

[0005] The invention is further characterized in that,

[0006] Roller guard plate A and roller guard plate B are respectively installed on both sides of the upper and lower boxes. Roller guard plate A is fixedly connected to the operating wall panel of the roll-to-roll offset printing machine, and roller guard plate B is fixedly connected to the transmission wall panel of the roll-to-roll offset printing machine. The upper box is connected to roller guard plate A and roller guard plate B through positioning connectors and rotating connectors, and the lower box is also connected to roller guard plate A and roller guard plate B through positioning connectors and rotating connectors.

[0007] The positioning connector includes a retractable spring shaft fixed inside roller guard plate A and roller guard plate B, and also includes hooks set on the side plates of the upper and lower housings, with the retractable spring shaft and the hooks corresponding to each other.

[0008] The hooks installed on the upper box include hook A, and the hooks installed on the lower box include hooks B and hook C, which are installed at the top and bottom respectively.

[0009] The rotating connector includes a composite sleeve fixing seat fixed inside the roller guard plate A and roller guard plate B. The composite sleeve fixing seat is provided with a rotatable fixing block. The fixing blocks are respectively fixed on the side plates of the upper box and the lower box. The composite sleeve fixing seat and the rotatable fixing block correspond one-to-one.

[0010] Each semiconductor cooling chip has a sponge strip mounting base underneath it, and sponge is glued into each sponge strip mounting base.

[0011] The semiconductor cooling chips are located in the middle of the upper and lower housings, respectively.

[0012] The beneficial effects of this invention are:

[0013] This invention provides a cleverly designed and simple temperature control device for roll-to-roll offset printing presses. It utilizes the cold and hot sides of a semiconductor cooling chip to regulate the temperature of the rubber sheet surface and the printed paper, respectively, thereby solving the problem of temperature rise on the rubber sheet surface, improving the durability of the rubber sheet, and ensuring print quality. It also dries the printed paper promptly to prevent smudging and improve print quality. Attached Figure Description

[0014] Figure 1 This is an assembly diagram of the temperature control device for a web offset printing press according to the present invention;

[0015] Figure 2 This is a schematic diagram of the temperature control device for a web offset printing press according to the present invention;

[0016] Figure 3 This is a schematic diagram showing the location of the temperature control device for a web offset printing press according to the present invention;

[0017] Figure 4 This is a partial enlarged view of the side of the temperature control device for a roll-to-roll offset printing press.

[0018] In the diagram, 1. Operating panel, 2. Transmission panel, 3. Roller guard plate A, 4. Roller guard plate B, 5. Upper printing plate roller, 6. Upper rubber roller, 7. Lower rubber roller, 8. Lower printing plate roller, 9. Axial fan, 10. Semiconductor cooling chip, 11. Hook A, 12. Sponge strip mounting base, 13. Upper housing, 14. Fixing block, 15. Paper path, 16. Lower housing, 17. Hook B, 19. Hook C, 20. Telescopic spring shaft, 21. Composite sleeve fixing base. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] Example 1

[0021] This embodiment provides a temperature control device for a web offset printing press, such as... Figure 1 As shown, the upper rubber roller 6 and lower rubber roller 7 are located on the web offset printing press, such as... Figure 2 As shown, the device includes an upper housing 13 and a lower housing 16 arranged vertically opposite each other. Both the upper housing 13 and the lower housing 16 contain a thermoelectric cooler 10, positioned at the midpoint of their respective locations. Below each thermoelectric cooler 10 is a sponge strip mounting base 12, with sponge adhered to the base. Both the upper housing 13 and the lower housing 16 have at least two air inlets and at least two air outlets, each equipped with an axial fan 9. Both the axial fan 9 and the upper housing 13 are powered by an external power source. Part of the air outlets of the upper housing 13 and the lower housing 16 are opposite to the paper path 15 of the roll-to-roll offset printing press. Another part of the air outlet of the upper housing 13 is opposite to the rubber cloth on the upper rubber roller 6, and another air outlet of the lower housing 16 is opposite to the rubber cloth on the lower rubber roller 7, which can generate air contact. Part of the air inlet of the upper housing 13 and the lower housing 16 is opposite to the cold side of the semiconductor cooling chip 10, and another part of the air inlet of the upper housing 13 and the lower housing 16 is opposite to the hot side of the semiconductor cooling chip 10.

[0022] Example 2

[0023] This embodiment provides a temperature control device for a web offset printing press, based on Embodiment 1, such as... Figure 3 As shown, roller guard plates A3 and B4 are respectively provided on both sides of the upper box 13 and the lower box 16. Roller guard plate A3 is fixedly connected to the operating wall panel 1 of the roll-to-roll offset printing machine, and roller guard plate B4 is fixedly connected to the transmission wall panel 2 of the roll-to-roll offset printing machine. The upper box 13 is connected to roller guard plates A3 and B4 through positioning connectors and rotating connectors, and the lower box 16 is also connected to roller guard plates A3 and B4 through positioning connectors and rotating connectors.

[0024] Example 3

[0025] This embodiment provides a temperature control device for a web offset printing press, based on Embodiments 1 and 2, such as... Figure 4 As shown, the positioning connector includes a retractable spring shaft 20 fixed inside the roller guard plate A3 and roller guard plate B4, and also includes hooks provided on the side plates of the upper box 13 and the lower box 16. The hooks provided on the upper box 13 include hook A11, and the hooks provided on the lower box 16 include hooks B17 and hook C19, which are provided vertically. The retractable spring shaft 20 corresponds to the position of the hooks.

[0026] The rotating connector includes a composite sleeve fixing seat 21 fixed inside the roller guard plate A3 and roller guard plate B4. The composite sleeve fixing seat 21 is provided with a rotatable fixing block 14. The fixing blocks 14 are respectively fixed on the two side plates of the upper box 13 and the lower box 16. The composite sleeve fixing seat 21 and the rotatable fixing block 14 correspond one-to-one.

[0027] When loading or unloading the rubber sheet or printing plate, the upper box 13 and the lower box 16 can rotate by using the fixing block 14 as a fulcrum and inserting the fixing block 14 into the composite sleeve fixing seat 21 on the roller guard plate A3 and the roller guard plate B4. When the upper box 13 and the lower box 16 rotate to the corresponding position that does not affect loading or unloading, they can be hooked onto the telescopic spring shaft 20 on the roller guard plate A3 and the roller guard plate B4 by hooks A11, hook B17, and hook C19. After loading or unloading, the upper box 13 and the lower box 16 can be reset.

[0028] The working principle of the temperature control device for a web offset printing press of the present invention is as follows:

[0029] When the semiconductor cooling chip 10 is powered on, one side is cold and the other side is hot. The hot side has a better heat dissipation effect, and the temperature of the cold side is lower. Generally, the temperature difference between the cold and hot sides is about 60℃. The appearance and size can be customized. The material is ceramic, which is wear-resistant.

[0030] Both the upper housing 13 and the lower housing 16 are provided with two air inlets and two air outlets, such as Figure 2 As shown, when the axial fan 9 opposite to the cold side of the semiconductor cooling chip 10 is started, air is drawn in through the air inlets on the upper housing 13 and the lower housing 16 and drawn to the cold side of the semiconductor cooling chip 10. At this time, the air is rapidly cooled. The cold air comes into contact with the rubber cloth on the upper rubber roller through the air outlets on the upper housing 13 and the lower housing 16, thereby cooling the rubber cloth. Low-temperature areas are formed in the air outlets of the upper housing 13 and the lower housing 16, near the upper rubber roller 6, near the lower rubber roller 7, below the upper printing plate roller 5, and above the lower printing plate roller 8.

[0031] When the axial fan 9, which is opposite to the hot surface of the semiconductor cooling chip 10, is turned on, air is drawn into the hot surface of the semiconductor cooling chip 10 through another air inlet on the upper housing 13 and the lower housing 16. At this time, the air is rapidly heated. The hot air comes into contact with the paper path 15 through another air outlet on the upper housing 13 and the lower housing 16, heating the paper and forming a hot zone in the area formed by the side of the upper housing 13, the side of the lower housing 16, and the paper path 15, thus realizing the drying function of the paper after printing.

[0032] When cold or hot air comes into contact with the hot or cold side of the thermoelectric cooler 10 and the temperature difference is large, condensation may occur. The corresponding sponge below it is to absorb any condensation that may occur. If so, the sponge strip should be replaced periodically. When the paper speed changes, the temperature of the cold and hot sides of the thermoelectric cooler 10 can be adjusted by controlling the speed of the axial fan 9, thereby controlling the surface temperature of the rubber sheet and the temperature of the low-temperature area and the hot area near the paper path 15.

[0033] As can be seen from the above, the present invention is a temperature control device for a roll-to-roll offset printing press, used for cooling the surface of the rubber sheet of the roll-to-roll offset printing press and for drying the paper after printing. By controlling the temperature, the optimal print quality of different types of paper can be obtained, while ensuring the print quality under high-intensity and high-efficiency working conditions.

Claims

1. A temperature control device for a web offset printing press, disposed at the upper rubber roller (6) and lower rubber roller (7) of the web offset printing press, characterized in that, The system includes an upper housing (13) and a lower housing (16) arranged opposite each other. Both the upper housing (13) and the lower housing (16) are equipped with semiconductor cooling chips (10). Both the upper housing (13) and the lower housing (16) have at least two air inlets and at least two air outlets. Axial flow fans (9) are installed at both the air inlets and outlets. A portion of the air outlets of the upper housing (13) and the lower housing (16) are connected to the paper path of the roll-to-roll offset printing press. 15) Relatively speaking, another part of the air outlet of the upper box (13) is opposite to the rubber cloth on the upper rubber roller (6), another part of the air outlet of the lower box (16) is opposite to the rubber cloth on the lower rubber roller (7), a part of the air inlet of the upper box (13) and the lower box (16) is opposite to the cold surface of the semiconductor cooling chip (10), and another part of the air inlet of the upper box (13) and the lower box (16) is opposite to the hot surface of the semiconductor cooling chip (10); The upper box (13) and the lower box (16) are respectively provided with roller protection plate A (3) and roller protection plate B (4) on both sides. The roller protection plate A (3) is fixedly connected to the operating wall panel (1) of the roll paper offset printing machine, and the roller protection plate B (4) is fixedly connected to the transmission wall panel (2) of the roll paper offset printing machine. The upper box (13) is connected to the roller protection plate A (3) and the roller protection plate B (4) through positioning connectors and rotating connectors. The lower box (16) is also connected to the roller protection plate A (3) and the roller protection plate B (4) through positioning connectors and rotating connectors.

2. The temperature control device for a web offset printing press according to claim 1, characterized in that, The positioning connector includes a retractable spring shaft (20) fixed inside the roller guard plate A (3) and roller guard plate B (4), and also includes hooks set on the two side plates of the upper box (13) and the lower box (16), with the retractable spring shaft (20) corresponding to the hook position.

3. The temperature control device for a web offset printing press according to claim 2, characterized in that, The hooks provided on the upper box (13) include hook A (11), and the hooks provided on the lower box (16) include hook B (17) and hook C (19) provided on the upper and lower sides respectively.

4. The temperature control device for a web offset printing press according to claim 1, characterized in that, The rotating connector includes a composite sleeve fixing seat (21) fixed inside the roller guard plate A (3) and roller guard plate B (4). The composite sleeve fixing seat (21) is provided with a rotatable fixing block (14). The fixing block (14) is fixed on the two side plates of the upper box (13) and the lower box (16) respectively. The composite sleeve fixing seat (21) and the rotatable fixing block (14) correspond one-to-one.

5. The temperature control device for a web offset printing press according to claim 1, characterized in that, Each of the semiconductor cooling chips (10) is provided with a sponge strip mounting base (12) below it, and sponge is pasted in each of the sponge strip mounting bases (12).

6. The temperature control device for a web offset printing press according to claim 1, characterized in that, The semiconductor cooling chip (10) is located in the middle of the upper housing (13) and the lower housing (16).

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