ã€China Aluminum Network】 1. After the repair process is disassembled and cleaned, all parts are strictly inspected. The main reasons for the internal leakage of the plunger pump are found to be: After the plunger and plunger holes are worn out, the clearance is too large. The cylinder surface is spherical. Wear unevenness with the mating surface of the valve plate. Therefore, the key to solving the inner leakage is to restore the original gap between the plunger and the plunger hole. The mating surface of the cylinder body and the flow plate can be used to meet the matching requirements. The cylindricity and roundness errors of the plunger bore can be repaired on an internal grinding machine and the plunger can be restored in size by brush plating. The specific method is as follows:
(1) Degreasing, derusting, and processing of the plunger surface a. The oil on the brush plating surface can be removed with organic solvents, common metal cleaners, and acetone, and the oil can be wiped off.
b. If the eccentric wear of the plunger is serious, the plastic must be ground to eliminate eccentricity.
c. If the surface of the plunger has scratches, grooves, and pits, it should be shaped.
(2) Electrochemical decontamination and activation of the plunger surface a. Electrocleaning: The plunger is connected to the negative electrode of the power supply, and the plated "target=_blank> plated pen is connected to the positive electrode, the voltage is 8-15V, the time is 60-90s, and the number one is used. The cleansing liquid is brushed repeatedly on the brushing surface, and the relative speed is 4-8m/min.The electric net treatment should be thorough, generally need to be processed twice to obtain better bonding strength. A continuous electrocleaning film exists, and the electrocleaning film does not collect into small droplets and dry spots appear. After electrocleaning, apply clean water and thoroughly clean the electrocleanse and other "target=_blank> other contaminants.
b. Surface activation treatment: When activated, the plating part must be connected to the positive pole of the power supply, and the plating pen is connected to the negative pole. The voltage is 8-15V and the time is 60-90s. Activated liquid "target = _blank> activation liquid first use No. 2, then use No. 3, deal with twice. No. 2 activation liquid with voltage 10-12V, time 60-90s; No. 3 use voltage 16-20V, time 50- The standard of activation is uniform silver gray on the surface of the plunger, and it is washed with clean water after activation.
