China's non-excavation technology has formed an industrial prototype

Trenchless technology has gained significant attention and application in the construction of urban underground pipelines in China. This is largely driven by the growing demand from the domestic market and the substantial economic and social benefits that this advanced technology offers. It is widely known that the development of trenchless technology in China can be divided into three key phases. During the early 1970s and mid-1980s, there were specific situations where road excavation was not allowed, such as on Beijing’s East and West Chang’an Street. In these cases, construction companies had to adopt non-excavation methods for pipe installation, which laid the foundation for the early development of modern trenchless technology in the country. The second phase was marked by the introduction of specialized equipment. From the mid-1980s to the mid-1990s, with the deepening of China’s reform and opening-up policies, the economy experienced rapid growth, leading to increased investment in urban infrastructure. As a result, the volume of pipelines—especially communication cables and cable TV lines—grew significantly. The number of pipelines crossing roads, railways, rivers, and ditches also increased, prompting a surge in the import of trenchless technology and equipment from abroad to meet the rising demands. In the late 1990s, China entered a period of independent development. Trenchless technology began to gain more public recognition, and the domestic market became increasingly optimistic about its potential. Companies started investing in research and development of small and medium-sized trenchless equipment, marking the beginning of a more self-reliant approach. Experts emphasize that the trenchless industry comprises two essential components: trenchless pipeline construction techniques and the corresponding equipment. Research into construction methods and processes not only shapes the direction of equipment development but also defines the fundamental performance requirements for such machinery. These technical foundations are crucial for implementing innovative technologies and ensuring their successful application. According to recent reports, after initial project development, engineering demonstrations, and market cultivation, a new industrial prototype of the trenchless sector has emerged. China now has the capability to establish its own equipment design and development centers and produce a range of trenchless devices. Major construction equipment is being developed comprehensively, and several specialized engineering firms have emerged, focusing on trenchless pipeline construction. These companies have begun to engage in various aspects of trenchless pipeline projects. However, compared to global standards, the industry is still in its early stages. First, trenchless technology has been well-established and widely accepted abroad, supported by government policies as a high-tech industry. Second, China's trenchless technology development remains uneven, especially in areas like pipeline replacement. Third, investment in new equipment development is limited, and the scope of innovation is still narrow. Bazhou Lutong Engineering Co., Ltd.: http://

Rotary Rings

Rotary Rings are a type of rotating seal widely used in various rotating equipment, such as rotary joints, rotary couplings, rotary connectors, etc. Its main function is to prevent liquid or gas leakage and maintain the normal operation of the equipment. In different applications, the material, structure, sealing method, size, etc. of Rotary Rings vary to adapt to different working conditions.

1. Material classification

The materials of Rotary Rings are mainly divided into two categories: metallic and non-metallic.

1. Metal materials

Metal materials mainly include stainless steel, steel, copper, aluminum, etc., which have characteristics of high strength, corrosion resistance, wear resistance, and are suitable for rotary seals in harsh environments such as high temperature, high pressure, and high-speed.

2. Non metallic materials

Non metallic materials mainly include ceramics, silicon carbide, graphite, etc., which have characteristics such as high hardness, high wear resistance, and low friction coefficient. They are suitable for rotary seals under conditions such as low temperature, low pressure, and high speed.

2. Structural classification
The structure of Rotary Rings is mainly divided into three types: unidirectional rotation, bidirectional rotation, and rotational stationary.
1. Unidirectional rotating structure

The Rotary Rings with a unidirectional rotation structure can only rotate in one direction and are suitable for devices with only unidirectional rotation.

2. Bidirectional rotation structure

The Rotary Rings with a bidirectional rotation structure can rotate in two directions, suitable for devices that require bidirectional rotation.

3. Rotating stationary structure

The Rotary Rings with a rotating stationary structure are composed of a rotating ring and a stationary ring. The rotating ring contacts the stationary ring during rotation to achieve sealing, suitable for equipment that requires a rotating stationary seal.

3. Classification of sealing methods

The sealing methods of Rotary Rings are mainly divided into mechanical sealing and liquid sealing.

1. Mechanical seal

Mechanical sealing is achieved through the contact surface between the rotating ring and the stationary ring, which has the characteristics of high reliability, long service life, and simple maintenance. It is suitable for rotary sealing in harsh environments such as high speed, high temperature, and high pressure.

2. Liquid sealing

Liquid sealing is achieved by injecting liquid between the rotating ring and the stationary ring, which has the characteristics of good sealing performance, low friction coefficient, and preventing dry friction. It is suitable for rotary sealing under low speed, low temperature, low pressure, and other conditions.

4. Size classification

The size of Rotary Rings is mainly determined by the equipment requirements, including inner diameter, outer diameter, thickness, shaft diameter, etc.

Rotary Rings, as an important type of rotary seal, are widely used, with different materials, structures, sealing methods, dimensions, etc. to adapt to different working conditions. When selecting Rotary Rings, it is necessary to make the selection based on specific equipment requirements to ensure the normal operation of the equipment.

Rotary Seals,Rotary Lip Seal,Rotating Shaft Seal,V Seals

DG Zhongxingshun Sealing Products Factory , https://www.zxs-seal.com