Accessories and characteristics of mud pump

• Jul 29, 2021
• The mud pump is divided into the power end and the power end. The following editor mainly introduces the mud pump accessories of these two systems. (a) Power end 1. Both the pump casing and the pump cover are welded by steel plates. The bea...

The mud pump is divided into the power end and the power end. The following editor mainly introduces the mud pump accessories of these two systems.

 

(a) Power end

 

1. Both the pump casing and the pump cover are welded by steel plates. The bearing seats of the drive shaft and crankshaft are integral steel castings, which are welded to the pump casing after processing, and annealed after welding to eliminate residual stress.

 

2. The size of the extension part at both ends of the mud pump accessory drive shaft is completely symmetrical, and both ends can be equipped with large pulleys or sprockets. The supporting bearings at both ends adopt single-row radial short cylindrical roller bearings.

 

3. The crankshaft adopts a forged straight shaft eccentric structure, instead of the traditional three-cylinder pump integral casting crankshaft structure at home and abroad, the casting is changed to forging, and the whole is changed to assembly, which is convenient to use, easy to manufacture and easy to maintain. The eccentric wheel, big herringbone gear hub and shaft adopt interference fit.

 

4. The connecting rod of mud pump accessories is made of ZG35CrMo, the small end of the connecting rod is equipped with a pin, and both ends of the pin are equipped with single-row radial short cylindrical roller bearings, which are assembled on the crosshead body. The crosshead body is made of nodular cast iron, and the guide plate is made of nodular cast iron. The gap between the guide plate and the cross head is 0.26-0.38 meters, and the cross head and the middle rod are connected by flanges and bolts.
 

 

(b) Liquid end

 

1. Mud pump accessories valve box: the overall forging is a vertical structure with a clearance volume of only 7.3 liters, which is a series of drilling pumps with a small clearance volume among the domestic high-power mud pumps. The three valve boxes are discharged and sucked through the discharge manifold and the suction manifold. One end of the exhaust manifold is equipped with a high-pressure four-way and exhaust pre-compression airbag, and the other end is equipped with a lever type (single pin multi-point) shear safety valve .

 

The discharged pre-compressed air bag is a one-piece casting. Its body, capsule and sealing ring. The inflation pressure of the pre-compressed air bag capsule is 20-30% of the working pressure, but in order to ensure the long-lasting working performance of the capsule, it should not exceed 45.7 atmospheres. (650psi), in this case, the pressure unevenness can be guaranteed ≤5%.

 

2. Mud pump accessories cylinder liner: Bimetal cylinder liner is used, and the inner layer is made of high chromium wear-resistant alloy. The inner surface roughness is required to be within 0.20, and the inner surface hardness ≥ HRC60. The specification of cylinder liner is φ 100-φ 100 for users to choose. The piston is composed of a piston core, a pressure ring and a clamp ring, which meets the ministerial standards. The intermediate mark is connected with the piston rod by a clamp, which is convenient for disassembly and assembly, and adopts an adjustable intermediate rod packaging box structure.
 

 

3. Cylinder head flange and valve cover flange are connected by trapezoidal thread.

 

4. Mud pump accessories cylinder liner fixing method: 3NB-600 pump cylinder liner is fastened and fixed with a union.

 

5. Spray system: According to user requirements, special electric centrifugal pump or centrifugal pump driven by drive shaft is used as spray pump, and the cylinder liner is cooled and lubricated through the nozzle on the spray box. Generally, water or water-based solution (soluble emulsified oil or diesel oil can be added) is used as the cooling liquid, which flows into the water tank for recycling. According to water pollution program and water temperature (0℃

 

6. Mud pump accessories exhaust manifold assembly: using an integral forged assembly and welding structure, the exhaust manifold and the front plane of the three valve boxes are connected with bolts and sealed with O-shaped packing, and the exhaust valve chambers do not communicate with each other.