Offset press

Abstract

The utility model belongs to the technical field of offset presses, and discloses an offset press which comprises a main body device used for conveying paper for offset printing, and a hot air device used for providing dust filtering hot air to dry printing ink is arranged above one side of the main body device. The drying device is arranged below the hot air device and is used for drying the printing ink by blowing at a high speed after shunting hot air speed reduction preliminary drying; the drying device comprises an air inlet pipe, a high-speed drying cover is installed on one side of the lower portion of the air inlet pipe, a flow dividing plate is arranged on one side of the top of the high-speed drying cover, and a flow dividing box is arranged on the side, close to the flow dividing plate, of the high-speed drying cover. According to the offset press disclosed by the utility model, due to the arrangement of shunting, speed reducing and preliminary drying, the influence on the offset printing quality caused by blowing away ink by dried hot air is avoided; through the arrangement of high-speed blowing drying after preliminary drying, the drying speed is increased; and through the arrangement of shunting hot air, double-speed drying can be achieved without an extra air source.

Description

Technical Field

[0001] The utility model belongs to the technical field of offset printing machines, and particularly relates to an offset printing machine. Background Art

[0002] An offset printing machine is a type of lithographic printing machine. During printing, the printed graphics and texts are first printed from the printing plate onto the rubber cylinder, and then transferred from the rubber cylinder to the paper. According to the paper feeding method, offset printing machines can be divided into single-sheet offset printing machines and web offset printing machines; according to the number of printing colors completed in one pass of the paper, they can be divided into single-color, two-color, four-color, and multi-color printing machines; according to the maximum paper format that can be printed, they can be divided into small offset printing machines, six-opening, four-opening, two-opening, and full-sheet printing machines. In addition, there are double-sided printing machines that can complete double-sided printing in one pass of the paper. Single-sheet offset printing machines are lithographic printing machines used for printing high-quality commercial printed matter and packaging printed matter, and are the mainstream of modern paper printing.

[0003] Comparing with the Chinese patent with the authorization announcement number CN218366991U, it discloses a carton offset printing machine for carton production, including a frame body and an offset printing mechanism. On the front and back sides of the right end of the top of the frame body near the offset printing mechanism, there are symmetrically fixed connection fixing seats. On the top of the two fixing seats, there is a transparent PC cover body. On the front and back ends of the bottom of the transparent PC cover body, there are symmetrically fixed connection first plug blocks. On the top of the two fixing seats, there are symmetrically opened first slots. On the front and back sides of the right end of the top of the frame body, there are symmetrically fixed connection support seats. On the top of the two support seats, there are symmetrically opened second slots. On the top of the two support seats, there is a hollow box body horizontally arranged. On the front and back ends of the bottom of the hollow box body, there are symmetrically fixed connection second plug blocks. On the front end of the top of the hollow box body, there is a blower. The right air outlet end of the blower is connected with a first ventilation duct. In the middle of the bottom of the hollow box body, there is a second ventilation duct connected. The bottom of the second ventilation duct is horizontally connected with an air storage duct body. At the bottom of the air storage duct body, there is a spray duct. In the middle of the right side of the hollow box body, there is an opening slot. On the front and back sides of the inner cavity of the opening slot, there are symmetrically opened limiting slots. At the lower end of the inner cavity of the hollow box body, there is an electric heating plate. In the inner cavity of the opening slot, there is a dust filter plate inserted. On the front and back sides of the dust filter plate, there are symmetrically fixed connection limiting sliders. In the middle of the right side of the dust filter plate, there is a handle.

[0004] When the above patent dries the ink, if the wind speed is too high, it is easy to blow away the ink, and if the wind speed is too small, it is not easy to dry the ink, which affects the offset printing quality. Therefore, a new device needs to be designed. Content of the Utility Model

[0005] The purpose of the utility model is to provide an offset printing machine to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A lithographic printing machine includes a main body device for conveying paper for lithographic printing. Above one side of the main body device, there is a hot air device for providing filtered hot air to dry the ink, and a drying device is also included, which is arranged below the hot air device and is used for diverting the hot air to reduce the speed and initially dry the ink, and then blowing the hot air at a high speed to dry the ink.

[0008] The drying device includes an air inlet pipe. On one side below the air inlet pipe, there is a high-speed drying hood. On one side of the top of the high-speed drying hood, there is a diversion plate. On the side of the high-speed drying hood close to the diversion plate, there is a diversion box. An arc-shaped channel is arranged in the diversion box, and the arc-shaped channel is communicated with the air inlet pipe. At one end of the arc-shaped channel far from the air inlet pipe, there is a low-speed drying hood. A spoiler is installed in the low-speed drying hood. Uniform flow plates are installed at the bottoms of both the high-speed drying hood and the low-speed drying hood.

[0009] Further: The main body device includes a conveyor belt. On one side above the conveyor belt, there is a lithographic printing mechanism. Two support bars are symmetrically arranged front and back on the side of the conveyor belt far from the lithographic printing mechanism.

[0010] Further: The hot air device includes an air box. A plurality of heating tubes are uniformly arranged at the bottom inside the air box. A plurality of fixing rings are uniformly arranged above the heating tubes. A fan is installed in the fixing ring. A filter cover is installed on the top of the air box, and a filter plate is installed inside the filter cover.

[0011] Further: The arc-shaped channel is in an S shape, and the surface is a smooth arc surface.

[0012] Further: The uniform flow plate is made of 304 stainless steel, and the uniform flow plate is bolted to the high-speed drying hood.

[0013] Further: Five heating tubes are provided, and four fixing rings are provided.

[0014] Compared with the prior art, the beneficial effects are:

[0015] 1. Through the setting of diverting and reducing the speed for initial drying, it is avoided that the hot air for drying blows away the ink and affects the lithographic printing quality;

[0016] 2. Through the setting of high-speed blowing and drying after initial drying, the drying speed is improved;

[0017] 3. Through the setting of diverting the hot air, dual-speed drying can be achieved without an additional air source. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of a lithographic printing machine described in the present utility model;

[0019] Figure 2 Is an axonometric view of the main device of an offset printing machine described in the present utility model;

[0020] Figure 3 Is an axonometric view of the hot air device of an offset printing machine described in the present utility model;

[0021] Figure 4 Is a front sectional view of the drying device of an offset printing machine described in the present utility model.

[0022] In the reference numerals of the drawings: 101, conveyor belt; 102, offset printing mechanism; 103, support bar; 201, air box; 202, heating pipe; 203, fixing ring; 204, fan; 205, filter cover; 206, filter plate; 301, air inlet pipe; 302, high-speed drying hood; 303, flow equalizing plate; 304, flow dividing plate; 305, flow dividing box; 306, arc-shaped channel; 307, low-speed drying hood; 308, flow disturbing plate. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] Please refer to Figures 1 - 4 , an offset printing machine, including a main device for transporting paper for offset printing, a hot air device for providing filtered hot air to dry the ink is arranged above one side of the main device, and a drying device for dividing the hot air to reduce the speed and then drying the ink by high-speed blowing is arranged below the hot air device.

[0025] In this embodiment: The main device includes a conveyor belt 101, an offset printing mechanism 102 is arranged on one side above the conveyor belt 101, and two support bars 103 are symmetrically arranged front and rear on the side of the conveyor belt 101 far from the offset printing mechanism 102. After the conveyor belt 101 continuously transports the paper to the offset printing mechanism 102 for offset printing, it continues to transport the paper printed with ink to the lower part of the drying device above the support bar 103;

[0026] In this embodiment: The hot air device includes an air box 201. Five heating tubes 202 are evenly arranged at the bottom inside the air box 201. Four fixing rings 203 are evenly arranged above the heating tubes 202. A fan 204 is installed inside the fixing rings 203. A filter cover 205 is installed on the upper surface of the air box 201. A filter plate 206 is installed inside the filter cover 205. The fixing rings 203 inside the air box 201 support the operation of the fan 204, enabling the air to be filtered by the filter plate 206 inside the filter cover 205, and then being heated by the heating tubes 202 and blown towards the drying device.

[0027] In this embodiment: The drying device includes an air inlet pipe 301. A high-speed drying cover 302 is installed on one side below the air inlet pipe 301. A flow dividing plate 304 is arranged on one side of the top of the high-speed drying cover 302. A flow dividing box 305 is arranged on the side of the high-speed drying cover 302 close to the flow dividing plate 304. An arc-shaped channel 306 is arranged inside the flow dividing box 305. The arc-shaped channel 306 is communicated with the air inlet pipe 301. One end of the arc-shaped channel 306 far from the air inlet pipe 301 is provided with a low-speed drying cover 307. A flow disturbing plate 308 is installed inside the low-speed drying cover 307. Flow equalizing plates 303 are installed at the bottoms of both the high-speed drying cover 302 and the low-speed drying cover 307. The arc-shaped channel 306 is in an S shape and has a smooth arc surface. The flow equalizing plates 303 are made of 304 stainless steel and are bolted to the high-speed drying cover 302. After the hot air enters the air inlet pipe 301, a part of it is divided by the flow dividing plate 304 and enters the arc-shaped channel 306 inside the flow dividing box 305, then enters the low-speed drying cover 307 through the arc-shaped channel 306, and after the wind speed is reduced by the flow disturbing plate 308, it is blown downward through the flow equalizing plate 303 at the bottom of the high-speed drying cover 302 to perform low-speed drying on the ink below, preventing the freshly printed ink from being blown away by the wind; the remaining part of the hot air is directly blown into the high-speed drying cover 302 and is blown downward through the flow equalizing plate 303 at its bottom to perform high-speed drying on the preliminarily dried ink.

[0028] Working principle: The conveyor belt 101 continuously conveys the paper to the offset printing mechanism 102 for offset printing, and then continues to convey the paper with printed ink below the drying device on the support bar 103. At this time, the fixing rings 203 inside the air box 201 support the operation of the fan 204, enabling the air to be filtered by the filter plate 206 inside the filter cover 205, and then being heated by the heating tubes 202 and blown into the air inlet pipe 301; after the hot air enters the air inlet pipe 301, a part of it is divided by the flow dividing plate 304 and enters the arc-shaped channel 306 inside the flow dividing box 305, then enters the low-speed drying cover 307 through the arc-shaped channel 306, and after the wind speed is reduced by the flow disturbing plate 308, it is blown downward through the flow equalizing plate 303 at the bottom of the high-speed drying cover 302 to perform low-speed drying on the ink below, preventing the freshly printed ink from being blown away by the wind; the remaining part of the hot air is directly blown into the high-speed drying cover 302 and is blown downward through the flow equalizing plate 303 at its bottom to perform high-speed drying on the preliminarily dried ink.

[0029] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An offset printing machine, comprising a main body device for conveying paper for offset printing, and a hot air device for providing filtered dust hot air to dry ink is arranged above one side of the main body device, and is characterized in that: It further includes a drying device arranged below the hot air device for diverting hot air to reduce the speed and initially drying, and then blowing hot air at high speed to dry the ink. The drying device includes an air inlet pipe (301). On one side below the air inlet pipe (301), a high-speed drying hood (302) is installed. On one side of the top of the high-speed drying hood (302), a flow dividing plate (304) is provided. On one side of the high-speed drying hood (302) close to the flow dividing plate (304), a flow dividing box (305) is provided. An arc-shaped channel (306) is arranged in the flow dividing box (305). The arc-shaped channel (306) is communicated with the air inlet pipe (301). At one end of the arc-shaped channel (306) far from the air inlet pipe (301), a low-speed drying hood (307) is provided. A spoiler (308) is installed in the low-speed drying hood (307). Flow equalizing plates (303) are installed at the bottoms of both the high-speed drying hood (302) and the low-speed drying hood (307).

2. The offset printing machine according to claim 1, wherein: The main body device includes a conveyor belt (101). On one side above the conveyor belt (101), an offset printing mechanism (102) is provided. On one side of the conveyor belt (101) far from the offset printing mechanism (102), two support bars (103) are symmetrically arranged front and back.

3. An offset printing machine according to claim 1, characterized in that: The hot air device includes an air box (201). A plurality of heating tubes (202) are evenly arranged at the bottom inside the air box (201). A plurality of fixing rings (203) are evenly arranged above the heating tubes (202). A blower (204) is installed in the fixing rings (203). A filter hood (205) is installed on the upper surface of the air box (201). A filter plate (206) is installed inside the filter hood (205).

4. An offset printing machine according to claim 1, characterized in that: The arc-shaped channel (306) is in an S shape and has a smooth arc surface.

5. An offset printing machine according to claim 1, characterized in that: The flow equalizing plate (303) is made of 304 stainless steel and is bolted to the high-speed drying hood (302).

6. The offset printing machine according to claim 3, characterized in that: Five heating tubes (202) are provided, and four fixing rings (203) are provided.

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