Product Introduction of Cylinder Liner flange
The cylinder liner flange is an important structural component in the hydraulic end cylinder liner installation system of the drilling mud pump. It is mainly used to provide installation, positioning and force-bearing basis for the cylinder liner, cylinder liner cover and related locking structures. In the hydraulic end of the mud pump, the cylinder liner needs to maintain a stable axial position and the correct center relationship. The cylinder liner flange is connected to the liquid cylinder or adjacent structures to form the fixed support part of the cylinder liner installation system.
Depending on the specific model of the mud pump, the cylinder liner flange can be connected to the cylinder liner cover by large-diameter threads, or it may have other dedicated locking structures. The axial preload force generated after the gland is tightened will form a complete force relationship through the flange and the cylinder liner installation structure, thereby stably keeping the cylinder liner at the specified position at the hydraulic end.
The cylinder liner flanges of different mud pump models may have significant differences in outer diameter, thickness, installation holes, center holes, connection threads, positioning steps and sealing fit positions, etc. Therefore, it is not possible to determine whether they can be interchanged merely based on the appearance dimensions or the diameter of the cylinder liner.
The main function of the cylinder liner flange
1. Provide a cylinder liner installation foundation: The cylinder liner flange is connected to the relevant structure of the hydraulic cylinder or hydraulic end, providing a stable mechanical foundation for the installation, positioning and clamping of the cylinder liner.
2. Bearing the preload of the cylinder liner gland: In a structure that uses threaded compression, after the cylinder liner gland is screwed into the cylinder liner flange, the flange needs to bear and transfer the axial preload generated by the gland.
3. Maintain the axial position of the cylinder liner: Working in conjunction with the cylinder liner, gland, locking ring and positioning structure, it restricts abnormal axial movement of the cylinder liner during the operation of the mud pump.
4. Maintain the installation center relationship: The flange center hole, positioning steps and installation surface jointly determine the installation position of the cylinder liner system, which helps to maintain the correct center relationship between the cylinder liner, the piston and the transmission system.
The fit relationship with the cylinder liner cover
The cylinder liner flange and the cylinder liner gland usually belong to the same cylinder liner locking system, but they perform different functions.
Cylinder liner flange: Fixed on the relevant structure of the hydraulic end, it provides the installation thread of the cover, positioning surface and load-bearing foundation.
Cylinder liner gland: It fits with the cylinder liner flange through threads or a special connection structure. After being tightened, it generates an axial clamping force to lock the cylinder liner in the specified position.
Therefore, when purchasing, the diameter, pitch, thread profile, rotation direction and effective meshing length of the mating threads of the cylinder liner flange and cylinder liner gland must be carefully checked. Even if the outer diameters of two flanges are close, they cannot be interchanged if their thread structures are different.
The relationship with the cylinder liner locking ring
In some drilling mud pump structures, the cylinder liner locking ring is installed at the corresponding positioning groove position of the cylinder liner, and together with the cylinder liner cover, it forms the axial limit and locking structure of the cylinder liner.
The cylinder liner flange is located at the external fixed end of the locking system, providing an installation position and load-bearing support for the gland.
The typical working relationship among the three can be understood as follows: The cylinder liner flange provides a fixed foundation, the cylinder liner cover generates an axial compression effect, and the cylinder liner locking ring forms the corresponding limit and load-bearing position on the cylinder liner.
Connect the thread with the load-bearing structure
Some mud pump cylinder liner flanges are equipped with large-diameter connecting threads, which are in coordination with the external threads of the cylinder liner cover. This thread is not only responsible for connection but also needs to withstand the axial load generated by the cylinder liner clamping system.
Therefore, the thread surface, effective meshing length and thread integrity are of great significance. If the tooth surface is scratched, worn, occluded, corroded or locally chipping occurs after long-term disassembly and assembly, it may affect the normal screwing of the cylinder liner cover and the transmission of preload force.
During maintenance, both the flange thread of the cylinder liner and the thread of the cylinder liner gland should be inspected simultaneously to avoid replacing only one part while neglecting the damaged mating surface on the other side.
Central hole and positioning structure
The center hole and internal steps of the cylinder liner flange need to maintain a correct fit with the cylinder liner, gland and the adjacent hydraulic end structure. A too small center hole, incorrect step position or deformation of the positioning surface may all affect the installation position of the cylinder liner.
For flanges with stoppers or positioning steps, it is important to carefully check the positioning diameter, step depth and end face dimensions. These parameters often determine whether they can be correctly assembled more than the simple outer diameter of the flange.
Installation holes and fixing methods
Cylinder liner flanges are usually connected to the liquid cylinder or related installation parts through bolts, studs or the fixed structures specified in the original equipment. The number, diameter, spacing and distribution form of installation holes for different pump types may vary.
When installing the flange, it is necessary to ensure that the installation surface fits evenly, and the fixed holes correspond correctly to the hydraulic end holes. The hole position error should not be compensated by forcibly pulling the bolts.
If there are burrs, corrosion or local deformation on the installation surface, it may cause uneven force on the flange and further affect the center position of the cylinder liner gland and the cylinder liner.
Common Failures and Inspections
When inspecting the cylinder liner flange, special attention should be paid to checking the connection threads, center holes, positioning steps, installation surfaces, bolt holes and the overall structure.
Common abnormalities include thread wear or biting, installation hole wear, end face indentation, positioning step wear, corrosion, local deformation and structural cracks, etc.
If the cylinder liner gland repeatedly loosens, is difficult to screw in or there is an abnormality in the position of the cylinder liner, in addition to checking the gland, the condition of the cylinder liner flange thread and the installation surface should also be inspected.
Key points for selection
When purchasing the cylinder liner flange of a drilling mud pump, it is recommended to focus on confirming the following information:
1. Brand, series and specific model of mud pump;
2. Hydraulic end or hydraulic cylinder model;
3. Matching cylinder liner model;
4. Matching cylinder liner cover model;
5. Flange outer diameter and total thickness;
6. Diameter of the center hole and dimensions of the internal steps;
7. Diameter of the connection thread for the gland cover;
8. Pitch, tooth profile and rotation direction;
9. Effective thread length;
10. Number and diameter of installation holes;
11. Center distance or distribution dimensions of installation holes;
12. Positioning stop mouth and installation end face dimensions;
13. Original part number, physical sample or technical drawing.
Installation and Maintenance
Before installation, the installation surface, center hole, positioning step and connection thread of the cylinder liner flange should be cleaned, and mud, rust, metal particles and old lubricants should be removed.
When installing, it is necessary to first confirm that the flange positioning surface correctly fits the hydraulic end structure, and then install the fixing bolts or studs in accordance with the corresponding maintenance requirements of the slurry pump.
Before installing the cylinder liner gland, it is necessary to check whether the internal threads of the flange and the external threads of the gland match. If there is obvious jamming, it should not be forcibly screwed in.
The fastening methods and pre-tightening requirements for the fixed bolts, studs and cylinder liner gland should be carried out in accordance with the corresponding technical data of the mud pump. It is not advisable to use the uniform empirical torque to replace the original equipment requirements.
Procurement Instructions
Juli Petroleum Drilling and Production Equipment Co., Ltd. provides cylinder liner flanges and hydraulic end cylinder liner system accessories for drilling mud pumps. Cylinder liner flanges are mainly used to provide installation, positioning and load-bearing foundations for cylinder liners, cylinder liner covers and related locking structures. There are differences among various models of mud pumps in terms of flange outer diameter, thickness, center hole, cover connection thread, installation hole and positioning structure. When purchasing, it is recommended to provide the model of the mud pump, hydraulic end model, cylinder liner and cover model, original part number, physical dimensions or technical drawings for matching verification.