Repair and maintenance of flexographic printing equipment

Maintaining flexographic equipment and maintaining good accuracy and working conditions are of great importance to ensure that production can be performed safely and with low consumption, and that the quality and output of printed products are increased.

First, flexo equipment maintenance

According to the law of wear of flexographic equipment, determine and schedule maintenance plans. Equipment maintenance is divided into minor repairs, repairs and overhauls. There should also be several minor repairs and intermediate repairs between the intermediate repairs and major repairs; the length of time between each repair interval should be determined according to the performance of the equipment and the specific and wear rules. At the same time, the equipment is rotated in a planned manner to ensure a balanced production task. The required tools, materials, spare parts, etc. are prepared in advance and scientifically organized so that the maintenance time is the shortest, the efficiency is the highest, and the maintenance quality is the best.

1. Minor repair of flexographic equipment

Minor repair is also called secondary maintenance. It is partial overhaul, and it eliminates minor fault. Clean the machine, replace the lubricant, perform a thorough cleaning, and perform some scheduled repairs for partial dismantling and partial repairs.

The main contents are as follows:

(1) Restore the installation level and adjust the gap between the main part and the parts. Partial restoration of the flexographic device precision.

(2) Repair or replace necessary wear parts.

(3) Scrape the wear parts and scrape the scratches and burrs.

(4) Clean and govern the lubrication devices (eg oil eye, oil cup, oil sump, oil guide, etc.).

(5) Clean, inspect, and adjust electrical devices.

(6) Observe if any detachable connectors or fasteners are loose or fall off and correct.

(7) Make a good record of the inspection of the joint surface and provide records for the planned repairs.

2. Flexographic equipment repair

In the mid-repair period, minor repairs generally refer to replacement of major wear parts on flexographic equipment (drums, anilox rollers, ink fountain rollers, bearings and sleeves, main drive gears, and cams).

Its main content:

(1) Full-scale precision inspection of flexible equipment, dismantling and decomposing parts that need to be repaired or replaced;

(2) Repair of benchmarks;

(3) Completely clean and repair the parts and components that need to be repaired;

(4) Cleaning, dredge the lubrication parts, oil change and oil seal;

(5) repair oil leakage parts;

(6) spray, touch paint;

(7) Perform a full inspection after the repair according to the assembly drawings and structural drawings of the flexo press.

3, overhaul of flexographic equipment

The overhaul is a thorough and comprehensive inspection and repair of flexographic equipment. Its main content:

(1) Accurate inspection of the whole machine and record for record;

(2) Disassemble, clean, repair or replace;

(3) Replace or repair parts that exceed the wear limit;

(4) Complete safety devices and various accessories;

(5) Repainting or plating;

(6) Test and acceptance according to the standard of equipment.

4, the life of flexographic equipment

During the use of flexo equipment, not only physical wear but also invisible wear occurs.

There are three kinds of life of flexographic equipment, namely equipment material life, equipment technology life and equipment service life.

Flexographic equipment in the late material life, due to equipment aging, continue to use will consume a lot of energy. Generally speaking, the overhaul cost of flexographic equipment does not exceed 50% of the original value of the equipment. If this number is exceeded, the value of overhaul must be considered. The overhaul fees include maintenance workers' wages, repair material fees, downtime loss fees, spare parts fees, and all costs associated with major repairs.

Second, the maintenance of flexographic equipment

Routine maintenance of flexographic equipment is the basis of planned maintenance and is a regular task. It runs through the use of flexo equipment. Proper maintenance is not only related to the normal operation and service life of the equipment, but also directly affects the printing quality. The maintenance of flexographic equipment mainly includes the following:

1. Check of flexographic equipment

To do maintenance work, first check and study the law of wear. That is to check and correct the operating conditions, work accuracy, wear and loose parts. A thorough understanding of the technical performance in operation and wear of components. Identify and eliminate hidden dangers in a timely manner; shorten equipment repair intervals and reduce repair costs.

Flexible printing equipment can be divided into daily inspections and regular inspections.

Flexo equipment inspection work content:

(1) Check the transmission section:

A. Check the tightness and usage of the drive belt and adjust its tension;

B. Check the status of the various transmission parts and each pair of movements, such as gears, chains, cams, worm gears, worms, and pins and keys;

C. Check the working performance of the ultra-fun clutch and replace the worn brake discs in time;

D. Adjust the levers of each part to ensure no looseness.

(2) Feed unit

A. Check the performance of each safety device of the paper feeding component;

B. Check the status of the detection system of the reel stand and each guide roller, hydraulic mechanism, pressure sensor, etc.;

(3) Printing section

A, check the fastening degree of each fastener;

B. Check the plate cylinder, impression cylinder, bearings and gears for wear;

C. Check the working status of the roller-clutch flexo transverse (vertical) register mechanism and overprint error detection system;

D. Check the situation of the printing plate clamping mechanism;

E. For high-speed, large-scale, and precision star-type flexo presses, it is also necessary to check the temperature control mechanism of the impression cylinder;

(4) Ink transfer section

A. Check the working status of the ink fountain roller, the ink transmission of the ink pattern, and the connecting parts of gears, worms, worm gears, eccentric sleeves, etc.;

B. Check the wear of the squeegee and the working condition of the squeegee reciprocating mechanism;

C. Pay attention to the work environment of the ink fountain roller. The ink fountain roller with a hardness of 75 degrees or more on shore surface should avoid temperatures below 0 degrees of the bottom of the ink fountain to prevent the rubber from becoming hard and cracking.

(5) Drying and cooling device

A. Check the working status of the automatic temperature control device;

B. Check the driving and working status of the cooling roller.

(6) Lubrication section

A, check the lubrication mechanism, oil pump, oil working conditions;

B. Add appropriate amount of lubricating oil and oil grease;

(7) Electrical parts

A. Check if the circuit is working abnormally.

B. Check whether the electrical components have any performance change, leakage, etc., and replace the components in time;

C. Check the motor and other related electrical control switches.

(8) Accessories

A, check the operation of the material guide system;

B. Check the dynamic image viewing device;

C. Check the ink circulation and viscosity control system.