The principle of hydraulic compression joint

The principle of hydraulic compression joint is mainly based on the pressure transmission and mechanical deformation of the hydraulic system. Its core is to cause long-term plastic deformation of the joint components through high pressure, thereby achieving a tight and excellent connection. The following is a step-by-step explanation of the specific principle:

1. Hydraulic system pressure generation

Power source: Hydraulic pumps (such as manual pumps and electric pumps) convert mechanical energy into hydraulic energy and generate high pressure through pressurized oil (such as hydraulic oil).

Pressure transmission: High pressure oil enters the hydraulic cylinder of the clamping mold through the hydraulic pipeline, pushing the piston to move.

2. Mold action and deformation control

Mold structure: The crimping mold is usually composed of multiple openable and closable mold flaps, evenly distributed around the outer wall of the joint.

Synchronous contraction: High pressure oil pushes the piston to synchronously contract the mold disc towards the center, applying uniform radial pressure to the outer wall of the joint.

Plastic deformation: The joint material (such as metal) undergoes plastic deformation under high pressure, causing the outer diameter to shrink and tightly adhere to the inner wall of the pipe, forming an interference fit.

3. Material and structure coordination

Joint design: The inner wall of the joint usually has chamfered or threaded structures that interlock with the protrusions or grooves on the outer wall of the pipe, enhancing the connection strength.

Material selection: Compatible materials (such as steel steel, copper copper) should be selected for joints and pipes to avoid electrochemical corrosion, while ensuring that the material does not break after deformation.

4. Sealing and anti loosening mechanism

Sealing principle: Plastic deformation forms a metal metal seal between the joint and the pipe, eliminating gaps and preventing fluid leakage.

Anti loosening design: Some joints are prevented from loosening by elastic recovery force after deformation or special structures (such as serrations), confirming long-term stability.

5. Pressure release and molding

Pressure holding stage: After reaching the set pressure, the system holds pressure for a period of time to confirm that the deformation is sufficient and uniform.

Demoulding: Release the hydraulic pressure, open the mold disc, and remove the already clamped joint. At this point, the joint is firmly connected to the pipe.

Key advantages

Trustworthy and willful: Plastic deformation forms long-term connections, with good resistance to vibration and impact.

Strong adaptability: It can connect pipes of different materials and diameters, suitable for harsh environments such as high pressure and high temperature.

Easy to operate: The hydraulic system provides stable pressure, and the crimping process has a suitable speed and high repeatability.

Application scenarios

Widely used in industries such as hydraulic systems, pneumatic systems, fuel pipelines, etc., such as construction machinery, automotive manufacturing, aerospace, etc., it is particularly suitable for scenarios that require high sealing and strong connection force.