KCB series gear pumps are suitable for conveying liquids with lubricating properties and similar properties with temperatures not higher than 150°C and viscosities not greater than 1500 cst. The pump gears are all made of hard tooth surfaces and are equipped with safety valves that act as overload protection for the motor.

First, the principle and characteristics of surface coating of gear pump

In recent years, the surface tack coating technology has been widely used in equipment maintenance in China, and is applicable to the repair of various material parts and equipment. The working principle is to directly apply adhesives such as molybdenum disulfide, metal powders, ceramic powders, and fibers to the surfaces of materials or parts to provide them with functions such as wear resistance and corrosion resistance, which are mainly used for surface hardening and repair. . Its process is simple, convenient and flexible, safe and reliable, does not require special equipment, just coated with a good glue on the cleaned parts surface, after curing, can be trimmed, often at room temperature operation, will not make parts Generates thermal work equivalent effects and deformations.

Second, the stick coating process

When the shaft sleeve outer diameter, sleeve end surface fitting surface, gear end surface or pump housing inner hole small area uniformity wear amount is between 0.15-0.50mm, and the scratch depth is more than 0.2mm, the stick-coating repair process should be adopted. The coating process of the adhesive coating: initial cleaning → pre-processing → final cleaning and activation treatment → preparation of repair agent → coating → curing → trimming, cleaning or post-processing.

Although the adhesive coating process is relatively simple, the actual construction requirements are quite strict. Only with the selected adhesive, high adhesive strength may not be obtained. It is necessary to choose the right adhesive, and stick to the right adhesive in accordance with the correct process method, and strictly adhere to the correct process method in order to obtain satisfactory adhesion.

The direction of rotation of the gear pump must match the inlet and outlet ports. If the gear pump is used for the first time or is used after being idle for a long time, it is better to run for about one hour under no-load or small-load conditions. If abnormal temperature rise, leakage, vibration, and noise are detected in advance during the run-in period, the machine should be shut down for inspection. Check valves and safety valves are preferably fitted with a check valve in the output line of the gear pump.

The gear pump is enclosed in a diverter valve which supplies the gear pump with ink evenly through a single tube supply system. The pump and its drive system use a synchronous AC motor. Rotary valves complete the determination of the amount of ink that is in the same position as the inkjet key they replaced. The valve works in binary mode.

Gear pumps are often used in agricultural machinery hydraulic systems. After the gear pump is used for a period of time, its performance will drop. Investigation shows that the main form of gear pump damage is the uniform wear and scratches of the shaft sleeve, pump housing and gear, and the average wear amount is generally between 0.02-0.50 mm. Trace depth is generally between 0.05-0.50mm. The use of gear oil pumps also has a considerable proportion.

"Gear pump pumping oil" means that the hydraulic oil breaks through the skeleton oil seal and overflows. Gear pumps should be used. This phenomenon is ubiquitous, and the OEM strongly reflects that the gear pump oil seriously affects the normal operation of the loader and the reliability of the gear pump and the environmental pollution. In order to facilitate the solution of the problem, the causes and control methods of oil pump oil seal oil leakage are analyzed.