The expansion and contraction of double ball rubber joint is one of its key performance indicators, which is affected by many factors.
First, the characteristics of rubber material play an important role in the expansion and contraction. Different rubber formulas have different properties such as elastic modulus, tensile strength and elongation at break. If the elasticity of the rubber material is insufficient, it cannot produce sufficient deformation when subjected to external force, thus limiting the expansion and contraction. For example, the expansion and contraction capacity of joints made of low-quality or unsuitable rubber raw materials will be significantly lower than that of joints made of high-quality rubber.
Secondly, the internal structural design of the joint will also affect the expansion and contraction. Factors such as the wall thickness of the ball, the structure and layout of the reinforcement layer will change the deformation capacity of the joint when it is compressed or stretched. Unreasonable structural design may lead to stress concentration, causing the rubber to reach the limit deformation prematurely in the local area, thereby reducing the overall expansion and contraction.
Furthermore, the temperature of the working environment is a factor that cannot be ignored. The physical properties of rubber will change with temperature. In a high temperature environment, the rubber will become softer and the elasticity will increase, but it may also cause a decrease in strength; in a low temperature environment, the rubber will become harder and brittle, and the expansion and contraction performance will deteriorate. For example, in winter in cold regions, if proper insulation measures are not taken, the expansion and contraction of the double ball rubber joint will be greatly reduced, and it may even be damaged due to the inability to adapt to the expansion and contraction of the pipeline.
In addition, the magnitude and frequency of the pressure also affect the expansion and contraction. When subjected to high pressure for a long time and with frequent pressure changes, the rubber joint is prone to fatigue, which reduces its elastic recovery ability, thereby gradually reducing the expansion and contraction.
In response to these influencing factors, the following countermeasures can be taken. In the selection of rubber materials, high-quality and performance-matched rubber materials should be selected according to specific working conditions, and strict quality inspections should be carried out to ensure that its elasticity and other properties meet the requirements.
For structural design, advanced computer simulation technology is used for optimization, and parameters such as the wall thickness of the ball and the structure of the reinforcement layer are reasonably determined, so that the joint can deform evenly when subjected to force and give full play to its expansion and contraction ability.
In terms of temperature, for high-temperature environments, high-temperature resistant rubber materials can be selected, and heat insulation devices can be set outside the double ball rubber joint; for low-temperature environments, cold-resistant rubber is used, and the pipeline system is heated or insulated to maintain the normal working temperature range of the rubber joint.
At the same time, it is necessary to reasonably control the pressure of the pipeline system, avoid excessive pressure and frequent pressure fluctuations, and install pressure reducing devices and buffer devices when necessary to reduce the pressure shock on the rubber joints, extend their service life and maintain a stable expansion and contraction amount, to ensure the safe and stable operation of the pipeline system.
