The application of adhesives in mechanical equipment maintenance is an important aspect of bonding technology. In our country, the economic foundation is still relatively weak, and the machinery and equipment of a large number of industrial enterprises are still in the stage of transformation and renewal, which has more practical significance-for machinery and equipment damaged by natural or human factors, only a small amount of manpower and material resources are used for rapid Repairing is much more cost-effective than updating equipment. Even if the economy is strong and the industry is developed in the future, low-cost bonding technology will still be retained as an important means. As for emergency repair under special circumstances (such as non-stop sticking, etc.), it is indispensable under any circumstances.

(1) Features of bonding repair

1. High strength requirements. Except for special reasons, the damage of mechanical equipment mostly occurs in weak links or places where stress is concentrated. When repairing with glued joints, high-strength structural glue must be selected and matched with proper mechanical connection of the plume section, and the whole process should be very careful to prevent mechanical stress and thermal stress.

2. The process is difficult. For the usual bonding process, the joint can be designed in advance. Even if adhesive bonding is used on a finalized product, the bonding method and joints are generally regular. The cracks that damage the equipment often appear in unpredictable locations, and the joints are also bizarre, and some huge equipment cannot be moved at all. This brings great difficulties to a series of processes such as pretreatment, sizing, heating and curing.

3. Time requirements are tight. When a marine vessel’s oil pipeline sprays or a gas tank leaks during a voyage, emergency measures must be taken under load conditions: first use fast adhesive to plug the gap, and then take measures to strengthen the gap so that it is no longer a weak link . All this is required to be completed in a relatively short period of time, and can maintain normal operation for a long period of time or even long-term operation.

Therefore, in a sense, bonding repair has higher technical requirements than general bonding or sealing, and it requires experienced technicians and skilled workers who are familiar with bonding skills and are familiar with mechanical repairs. Direct operation. In order to achieve the desired effect.

(2) Types of bonding repair

Because of the damage of mechanical equipment, it can be roughly divided into three types: rupture, wear and leakage. Therefore, the bonding repair can be divided into three types: crack repair, trimming and dry blocking.

1. Cracking type. For thin-walled equipment or equipment that is not under pressure, the usual bonding process can be used. Parts and equipment with thick walls and heavy forces should be repaired using the dry-in-one buckle method.

2. Trimming type. In addition to simply restoring its appearance, when dressing worn-out machinery, a large amount of wear-resistant fillers should be added to the glue to increase its wear resistance.

3. Dry block type. Generally, it is only necessary to consider the adherend and the medium inside and outside the container. Instead of stopping and sticking, it is also necessary to consider the special conditions (temperature, pressure) and the speed of bonding when sticking and blocking are more complicated.