CN204488175U - A kind of offset press damping device - Google Patents

Abstract

The utility model discloses a wetting device for an offset printing machine, which comprises water string rollers and water transfer rollers in contact with each other. A water bucket is arranged below the water string rollers and the water transfer rollers. The water bucket is connected with a spray pipe through a pipeline. The shower pipe is located directly above the contact between the water string roller and the water transfer roller. The water string roller is in contact with a set of water strike rollers, and a set of water strike rollers is in contact with the printing plate cylinder. The water string rollers pass through a set of water strike rollers The dampening fluid is transferred to the plate cylinder. The utility model is a wetting device of an offset printing machine, which uses a spray pipe to wet the water transfer roller and the water string roller, and removes the water bucket roller, so that the function of the water bucket is not to supply water to the wetting system, but to make the wetting system Recover the excess wetting liquid in the water tank, and concentrate it in the wetting liquid purification system for recycling, which solves the problem that the impurity in the water bucket pollutes the wetting liquid during the printing process and affects the wetting quality of the printing plate problem, improved plate wetting quality.

Description

Wetting device for offset printing machine

technical field

The utility model belongs to the technical field of printing devices, in particular to a wetting device for an offset printing machine.

Background technique

Offset printing technology is one of the most widely used printing technologies at present. The offset printing machine is mainly composed of a paper feeding part, a printing part and a paper receiving part. The printing part can be divided into three parts: inking, wetting and printing. The wetting device can be divided into contact type and non-contact type according to the way of supplying wetting liquid to the printing plate, and can be divided into continuous water supply and intermittent periodic water supply according to the way of supplying wetting liquid. Regardless of the wetting method, its main body is composed of a water supply part, a water uniform part and a water landing part, as shown in Figure 1. Water roller, etc., the water bucket roller transfers the dampening liquid in the water bucket to the printing plate cylinder through the water transfer and water uniform part. During the transfer process of the dampening liquid to the printing plate, some ink skin, paper powder and impurities on the printing plate will enter the water bucket with the wetting system, and the dampening liquid contacts the air in the water bucket, and the air in the air Some impurities will also enter into the wetting liquid of the bucket, so the system that uses the above method to wet the printing plate is an open wetting system, which can easily lead to contamination of the wetting liquid, thereby reducing the wetting quality of the system , thus affecting the quality of printed products. Therefore, in general, the wetting liquid in the water bucket must be purified, but this purification can only be performed on the wetting liquid that flows back through the water bucket, and the wetting liquid in the water bucket may be polluted. As a result, the quality of plate wetting is compromised, which ultimately has a negative impact on the quality of the printed product.

Utility model content

The purpose of this utility model is to provide a wetting device for an offset printing machine, which solves the problem that the wetting liquid is polluted by impurities in the bucket during the printing process, thereby affecting the wetting quality of the printing plate.

The technical solution adopted by the utility model is: a wetting device of an offset printing machine, which includes a series water roller and a water transfer roller in contact with each other. The shower pipe is connected, and the spray pipe is located directly above the contact between the water string roller and the water transfer roller. The dampening rollers transfer the dampening fluid to the plate cylinder.

The utility model is also characterized in that,

A wetting liquid purification and return system is set between the bucket and the spray pipe.

A hydraulic pump and a valve are sequentially arranged on the pipeline between the wetting liquid purification and return system and the spray pipe.

There is a water inlet hole on the spray pipe, and the water bucket is connected to the water inlet hole of the spray pipe through the pipe. There is a water discharge microhole along the length direction of the spray pipe. The water outlet microhole is located in the contact between the string water roller and the water transfer roller directly above.

The length of the spray pipe is equal to the length of the water transfer roller.

Two or more water outlet microholes are equidistantly arranged.

The beneficial effects of the utility model are: the utility model is a wetting device for an offset printing machine, which uses a spray pipe to wet the water transfer roller and the string water roller, and removes the water bucket roller, so that the water bucket does not serve as a wetting system. Instead of supplying water, the excess wetting liquid in the wetting system is recovered and concentrated into the wetting liquid purification system for recycling, which solves the problem of contamination of the wetting liquid due to impurities in the water bucket during the printing process Thus affecting the wetting quality of the printing plate, improving the wetting quality of the printing plate.

Description of drawings

Fig. 1 is a structural schematic diagram of a traditional offset press wetting device;

Fig. 2 is a structural schematic diagram of the wetting device of the offset printing machine of the present invention;

Fig. 3 is a structural schematic diagram of the spray pipe of the wetting device of the offset printing machine of the present invention.

In the figure, 1. printing plate cylinder, 2. dampening roller, 3. serial water roller, 4. water transfer roller, 5. water bucket roller, 6. water bucket, 7. spray pipe, 8. wetting liquid purification And return system, 9. Valve, 10. Hydraulic pump, 11. Water inlet hole, 12. Water outlet micropore.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The utility model is a wetting device of an offset printing machine, as shown in Fig. 2, comprising a series water roller 3 and a water transfer roller 4 in contact with each other, and a water bucket 6 is arranged below the water series roller 3 and the water transmission roller 4, and the water bucket 6 is connected with the spray pipe 7 through the pipe, as shown in Figure 3, the spray pipe 7 is provided with a water inlet 11, the water inlet 11 is connected with the pipe, and a water discharge microhole is arranged along the length direction of the spray pipe 7 12. Two or more water outlet microholes 12 are equidistantly arranged. The water outlet microholes 12 of the spray pipe 7 are located directly above the contact between the string water roller 3 and the water transfer roller 4. The spray pipe 7 is a metal roller. The length is equal to the length of the water transfer roller 4, the string water roller 3 is in contact with a group of water strike rollers 2, a group of water strike rollers 2 is in contact with the printing plate cylinder 1, and the string water roller 3 passes through a group of water strike rollers 2 to wet The wet liquid is transferred to the printing plate cylinder 1, and the wetting liquid purification and return system 8 is arranged between the water bucket 6 and the spray pipe 7, and the pipeline between the wetting liquid purification and return system 8 and the spray pipe 7 is arranged in sequence There are hydraulic pumps 10 and valves 9.

When in use, the hydraulic pump 10 makes the wetting liquid in the wetting liquid purification and return system 8 flow to the spray pipe 7, and the wetting liquid flows from the spray pipe 7 to the string water roller 3 and the water transfer roller 4 in contact with each other. At the position, the flow rate and flow rate of the dampening liquid in the spray pipe 7 are controlled by adjusting the valve 9, the dampening liquid is passed from the string water roller 3 to the water roller 2, and the dampening roller 2 transfers the dampening liquid to the plate cylinder 1 , complete the wetting of plate cylinder 1. The excess wetting liquid will be recovered by the water bucket 6 and enter the wetting liquid purification and return system 8. The wetting liquid purification and return system 8 will return the purified wetting liquid to the spray pipe 7 to realize the circulation and return of the wetting liquid. Reuse.

The beneficial effects of the utility model are: the spray pipe 7 is used to wet the water transfer roller 4 and the string water roller 3, the water bucket roller 5 in the wetting device of the traditional offset printing machine is removed, and the traditional offset printing machine is provided by the water bucket 6. The mode of wetting liquid is changed to provide wetting liquid by spraying pipe 7 spray mode, is about to change the mode of open type supplying wetting liquid into the mode of closed type supplying wetting liquid, the effect of water bucket 6 is not to wetting liquid like this. Instead of supplying water to the wet system, the excess wetting liquid in the wetting system is recovered and concentrated into the wetting liquid purification system for recycling, which effectively prevents the pollution of the wetting liquid and improves the printing plate Wetting quality.

In the wetting structure adopted by the utility model, the excess wetting liquid will be recovered through the water bucket 6 and enter the wetting liquid purification and return system 8, so as not to cause excess wetting liquid to enter the printing system during the wetting process , thereby affecting the printing quality. The spray pipe 7 used in the wetting system has a simple structure, and only through the hydraulic pump 10 and the valve 9, the amount of wetting liquid used in the wetting process can be controlled.

Claims (6)

1. A wetting device for an offset printing machine, characterized in that it comprises a water string roller (3) and a water transfer roller (4) in contact with each other, and the water string roller (3) and the water transfer roller (4) are arranged below A water bucket (6) is arranged, and the water bucket (6) is connected with a spray pipe (7) through a pipeline, and the spray pipe (7) is located at the contact point of the string water roller (3) and the water transfer roller (4) Directly above, the water rollers (3) are in contact with a group of water application rollers (2), and a group of water application rollers (2) are in contact with the plate cylinder (1), and the water rollers (3) pass through a group of The dampening roller (2) transfers dampening fluid to the plate cylinder (1). 2. The wetting device of an offset printing machine according to claim 1, characterized in that, a wetting liquid purification and return system (8) is arranged between the water bucket (6) and the spray pipe (7). 3. A wetting device for an offset printing machine according to claim 2, characterized in that hydraulic pumps are sequentially arranged on the pipeline between the wetting liquid purification and return system (8) and the spray pipe (7) (10) and valve (9). 4. A wetting device for offset printing press according to claim 1 or 3, characterized in that, the spray pipe (7) is provided with a water inlet hole (11), and the water bucket (6) passes through the pipe and the spray The water inlet hole (11) of the shower pipe (7) is connected, and a water outlet microhole (12) is arranged along the length direction of the shower pipe (7). Directly above where the roller (4) contacts. 5. The wetting device of an offset printing press according to claim 4, characterized in that, the length of the spray pipe (7) is equal to the length of the water transfer roller (4). 6. The wetting device of an offset printing press according to claim 4, characterized in that, two or more of the water outlet microholes (12) are equidistantly arranged.