Concrete pump maintenance

If the concrete pump is used improperly during operation, it is easy to cause some parts of the pump to be damaged prematurely, which not only increases the equipment maintenance cost, but also seriously affects production. How to improve the service life of the wearing parts of the concrete pump:

1. Cutting ring and eyeglass plate The cutting ring and the eyeglass plate are a pair of tightly matched parts with relative movement. A layer of wear-resistant material is welded on the contact surface of the two. The gap between the two can be adjusted to (0.1~0.2) mm through the special-shaped nut at the end of the spline shaft of the S-shaped tube. The rubber spring assembled between the S-shaped tube and the cutting ring allows the cutting ring and the eyeglass plate to move flexibly and freely relative to each other.

As the use time increases, the rubber spring loses its elasticity, and the joint surface of the cutting ring and the eyeglass plate will wear, resulting in an increase in the gap between the two. When the gap is greater than 0.7mm, it needs to be adjusted immediately, otherwise the pumped mortar will take advantage of the "gap" to enter. Once mortar enters the friction surface, the wear rate of the cutting ring and the eyeglass plate will be greatly accelerated.

When pumping concrete, the cutting ring swings with the swing of the S-shaped tube, playing the role of cutting concrete. Therefore, the cutting ring wears faster. The higher the pressure of the concrete at the outlet, the more serious the wear of the cutting ring. Usually, the wear of the cutting ring first occurs at the edge and at two symmetrical parts at a 90° angle on the upper part. Therefore, when the above parts of the cutting ring are worn, the cutting ring can be rotated an angle in time and continued to be used, which is equivalent to doubling the service life of the cutting ring. The wear of the eyeglass plate first occurs at the middle bridge of the nose. The larger the gap between the eyeglass plate and the cutting ring, the faster it wears. Therefore, it is necessary to always pay attention to the gap between the eyeglass plate and the cutting ring. Once the gap is found to be enlarged, the special-shaped nut must be tightened immediately or the worn parts must be replaced to prevent mortar from entering the friction surface. When the rubber spring loses its elasticity, it must be replaced immediately. For the repairable cutting ring and eyeglass plate, D507 welding rod can be used for repair welding and continued use.

2. Piston and delivery cylinder

The piston is generally made of polyurethane materials, which are elastic and wear-resistant. The inner wall of the delivery cylinder is also plated with wear-resistant materials. There are generally two ways of lubrication between the piston and the delivery cylinder: one is automatic refueling lubrication, where the refueling system automatically adds lubricating oil every time the pump is pumped; the other is a manual refueling system, which requires manual refueling on a regular basis. For the automatic refueling system, it is necessary to regularly check whether the oil circuit is unobstructed, otherwise once the oil circuit is blocked, the piston and delivery cylinder will wear sharply; for the manual refueling system, the operator should regularly add lubricating oil according to the different working environments, usually once/h. Remember: when refueling, be sure to jog the piston to the lower part of the vertical refueling point so that the lubricating oil just enters the oil groove in the middle of the piston. During the pumping process, the operator must also frequently perform the "holding cylinder" operation, that is, when the piston of the main oil cylinder runs to the end point, operate the jog button and hold it for 5 to 8 seconds to replenish the hydraulic oil in the closed oil chamber of the main oil cylinder (for pumps that rely on proximity switches for reversing, the proximity switch should be as close to the side of the main oil cylinder as possible) to make full use of the stroke of the delivery cylinder and avoid local wear of the delivery cylinder.

About Us：JIUHE specializes in researching, manufacturing, selling, and after-sale for construction machinery, main products: are trailer concrete pumps, concrete line pumps, concrete pump trucks, concrete placing booms, wet shotcrete machines, ladder lift truck, Aerial lift truck and so on. Contacts: [email protected], +86-18765912751