A guide to the selection of rotary joints, what is a rotary joint, and what is the working principle

The rotary joint of the semiconductor device, also known as the rotary oil distribution cup, can realize the 360-degree rotation of the pipe, and the stable and efficient transmission of fluids or gases to ensure the normal operation of the system. In the state of keeping each flow path independent, a rotary joint that transports a variety of pressure fluids with different properties and pressures to the rotating body. It is also possible to divert the pressure fluid fed by a single flow path fixed piping to multiple ports and supply the rotating body.

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1. One-way flow type: install rotary joints at both ends of the drum, and the fluid enters from one end and discharges from the other end, without using the inner tube.

2. One-way flow type: a rotary joint is installed at one end of the drum, and the fluid is introduced and discharged at this end at the same time, and the rotation of the inner tube relative to the drum is stationary.

4. Two-way flow type (inner tube rotation): This type is used for the structure where the inner tube is relatively fixed together in the drum and runs synchronously with the drum, at this time, the fluid is introduced into the inner tube and discharged by the outer tube.

5. Two-way flow type (inner tube rotation): The inside of the drum is equipped with a siphon that runs synchronously with the drum to discharge the condensate, which is mostly used for steam type.

A rotary joint is a kind of closed rotary connector that rotates 360° to convey the medium. Ode to the Book.

The working principle of the rotary joint is to input the slurry, dirt and other fluid foreign body media from the stationary pipeline into the rotating or reciprocating moving equipment, increase the rotation range of the optional rotary joint through the pressure and temperature speed, and use the connected hollow shaft and the concentricity of the rotating body to discharge the slurry, dirt and other fluid foreign body media from the rotary joint.

Expansion of the sale of the lot:The types of rotary joints are divided into hydraulic rotary joints, wild bucket macros, high-pressure rotary joints, multi-channel rotary joints, high-speed rotary joints, high-temperature rotary joints, single-channel rotary joints, special rotary joints for LEDs, special rotary joints for excavators, and special rotary joints for machine tools.

The application fields of rotary joints cover almost all processing and manufacturing industries. Such as: metallurgy, machine tools, power generation, petroleum, rubber, plastics, textiles, printing and dyeing, pharmaceuticals, cigarettes, papermaking, food, feed processing, etc.

Encyclopedia - Rotary Joint.

Encyclopedia – Connectors.

The rotary joint is a kind of connector, which is the transfer interface between the two pipes, which is a closed rotary connector used to transmit the medium, don't look at it as just a small adapter, but it has its role in various industries. Moreover, it can transmit a variety of media such as gases and liquids, which is very useful. In addition, it also has its own standards and connection methods, including its structure is also diverse, but because they are all rotary joints, although the structure is different, its principle is the same.

Let's see how it works. 

Principle of rotary joint: Judgment of the swivel

The rotary joint has three oil ports connected to the workshop pipeline, namely the A port, the B port, and the Y port. The three oil ports and the shell of the rotary joint are statically connected to the auspicious state. The housing and the uncoiler or coiler are kept relatively non-rotating.

The rotary joint is combined with the expansion and contraction cylinder handle through the flange at the far right, and the oil port of the rotary joint is butted with the oil port of the hydraulic cylinder, and the rotary seal of the rotary joint is mainly of two types, composite seal and mechanical seal. The diameter of the mandrel is smaller than that of the housing, and its clearance is comparable to the gap between the barrel and the piston of a general hydraulic cylinder.

Due to the installation, the swivel joint will oscillate during rotation, and the two bearings are used to withstand the axial force generated when the housing oscillates and to maintain the gap between the mandrel and the housing. The material of the rotary seal is a wear-resistant composite or metal material, and the rotary seal is installed between the mandrel and the housing. Rotary seals can withstand high pressures, usually up to 200 bar, and the material is hard, and the sealing performance is not good.

The oil seal is a skeleton lip seal that cannot withstand excessive pressure, usually not more than 3 bar, but it has a good seal at low pressure and high speed, and its function is to seal the leaking oil from the rotary seal. The leaking oil must be drained back into the tank at very low pressure to protect the oil seal from damage. A filter cannot be installed on the leaking tubing.

The sealing performance of composite seals is relatively better, and it is used in the occasion where the hydraulic cylinder has intermediate positioning. The use of composite seals for rotary joints can make rotary joints more compact and compact due to the small size of the seal itself. The cost of composite seals themselves is also much cheaper than mechanical seals.

The composite rotary seal consists of two parts, a PTFE outer ring and an NBR O-ring. The O-ring acts as a support for the outer ring, making the entire rotary seal easier to install. Sliding between the outer ring and the housing of the swivel joint.

After reading these principles, do you have a new understanding of rotary joints? Do you feel that a small rotary joint is actually very important? The principle of rotary joints allows you to learn how to use it more accurately, and can also help you better apply it in various industries.

In addition, we should also pay attention to the maintenance of it, so that its use time is extended, in addition, we should pay attention to whether there is any leakage at the interface of the rotary joint, because there are often problems at the interface of the rotary joint, so be careful.

You can get it for free

Swivel joint is a device that transmits compressed air, hydraulic oil, water, grease and other media in a rotating state.

The development of the industry has promoted the rapid development of the rotary joint industry, and there are hundreds of specifications and models of rotary joints. Every time you choose a model, you have to ask: does your company produce **enterprise** model rotary joints? In fact, a careful analysis of the specifications and models of rotary joints will find common ground:

Such as: XTGSHYS high-speed rotary joint.

The first two letters represent the enterprise name (the first letter of the manufacturer's business name) GS stands for high speed, H stands for end face seal, S stands for two-way circulation, and Y is the ** seal structure type of the internal model of the enterprise

Q type = spherical seal structure.

Type Q2 = Double spherical seal structure.

QR type = double-reed seal structure.

H type = face seal structure.

Type D = Double-acting seal structure.

Circulation form: d = one-way circulation.

s = bidirectional flow-through.

Nominal specifications: Imperial specifications, metric specifications.

1 2-1 8 15-6 4 points 1 1 2-3 4 40-20 1 inch and a half 3 4-1 4 20-8 6 points 2-1 50-25 2 inch 1-3 8 25-10 1 inch 2 1 2-1 1 4 65-32 2 inch and a half 1 1 4-1 2 32-15 1 inch 23-1 1 2 80-40 3 inch inner tube specifications:

Fixed: Refers to the thread specification.

Rotary: refers to the outer diameter of the inner tube.

Inner tube form: g = inner tube fixed type.

x = Ordinary sealed inner tube rotary type.

XT = Packing Seal Inner Tube Rotary Type.

Outer tube connection form:

g = pipe threaded connection.

r = conical threaded connection.

f fa=flange connection.

HM = 2 types of face seal structure and outer circle seal structure.

MD = one-way flow-through.

MS = bidirectional flow-through.

d——Double-end sealed series rotary joints.

S - bidirectional flow type series rotary joint.

d——One-way flow type series rotary joint.

H——Copper, cast copper shell single-end seal series rotary joints.

The rotary joint is based on the requirements of the working conditions such as the medium and the speed, so the models are not the same, which is roughly divided into the national standard rotary joint, and Movron can also customize the rotary joint according to the user's requirements. According to the requirements of use, it is divided into: multi-channel rotary joint, double-channel rotary joint and single-channel rotary joint.

According to the working requirements, the medium is divided into: steam, heat transfer oil, air (vacuum), cooling water, etc.

Heat transfer oil rotary joint QS-GF type, hydraulic rotary joint HS-GF, steam rotary joint QD (65-100), non-standard rotary joint TXTD, cooling water rotary joint HS-GF, water rotary joint HS-XF type, steel mill special rotary joint TXGD type.

Tengzhou Luxin rotary joint provides you with a variety of specifications of rotary joints, with the most reasonable rotary joints**, rotary joints** and other product information base, we will do our best to provide you with accurate and comprehensive rotary joint information.

Yesterday, Luxin rotary joint orders began to be shipped to users.

d——Double-end sealed series rotary joints.

S - bidirectional flow type series rotary joint.

d——One-way flow type series rotary joint.

H——Copper, cast copper shell single-end seal series rotary joints.

The experts of Tengzhou Eurasia Machinery tell you.

The rotary joint should be installed correctly according to the requirements of the installation and use manual, otherwise its sealing performance and its life will not be fully utilized.

1. Assembly and installation of one-way rotary joints and matching equipment.

When the hollow shaft is connected with the rotating body by threading, the thread is generally coated with white lead oil or soft film, and the mandrel is clamped with a tool (generally designed with a wrench clamping plane) to screw in the center of the threaded connection hole of the rotating body until it is tightened.

When the hollow shaft is connected with the rotating body by flange, a uniform washer of thickness should be added at the end of the hollow shaft of the extended flange, and then the end of the rotating body is matched with the matching part and the screw hole, which is fixed with bolts, and when the bolt is tightened, the angle should be tightened, and finally tightened, and the torque should be the same.

2. For the two-way inner tube fixed rotary joint, the connection between the outer pipe and the equipped rotating body is the same as that of the one-way rotary joint. The difference is the installation of the inner tube.

The connection mode of the end cover of the inner pipe and the rotary joint is generally connected by tapered pipe thread and pipe thread, and its connection is opposite to the rotation direction of the rotating body, and the rotation direction is the same as that of the outer pipe with thread or with the rotating body. When the outer pipe is connected by flange, the inner pipe and the end cover are threaded, and sometimes the end of the inner pipe is locked in the end cap with a nut.

During installation, the inner tube is tightened by the end hole of the outer pipe to the end cover screw hole of the swivel joint inward, and then the inner tube is sent into the inner cavity with the rotating body.

3. The connection and assembly of the outer pipe of the two-way inner tube rotary joint and the matching rotating body are the same as those of the one-way rotary joint, the difference is the installation and assembly of the inner tube.

Before installing the outer tube, the inner tube is assembled with a rotating body. The inner tube of this structure is generally connected with the rotating body by threading, and its rotation direction is opposite to that of the rotating body.

Remove the end cover of the rotary joint, when the packing seal is used between the inner and outer pipes, the packing gland and the stop pin (some rotary joints are designed with this part) should be removed, and the packing should be loosened in different situations, or the packing should be taken out, and then the inner tube should be loaded in the center of the outer tube, and the outer tube should be fixedly connected with the rotating body. Then assemble the inner tube packing gland and end cap in reverse according to the original disassembly order.

4. The following work should be done before it is connected with the pipeline fittings with the conveying fluid:

Pull the swivel joint housing with your hand or tool to check whether it rotates flexibly, otherwise you need to find the cause and adjust.

When equipped with ball bearings and designed with lubricating grease addition and relief holes, check whether the oil filling hole is up and the relief hole is down, and check whether the straight oil injection cup is damaged or blocked during handling.

Check and adjust whether the position of the fluid entering or exiting the pipe corresponds to the corresponding hole of the rotary joint and meets the design requirements.

Assemble the stop rotation and load-bearing hoisting structural parts of the rotary joint, and adjust the concentricity of its shell to be consistent with the hollow shaft.

5. Assemble and connect metal flexible hoses (or other flexible hoses) and other related pipe fittings according to the installation and operation instructions of the rotary joint, and connect and fix them with the pipeline for transporting fluid.

For example, when the temperature of the screw extruder is too high, it is necessary to make the hollow inside of the screw into a circulating water flow to take away the heat.

The function of the rotary joint is to feed the liquid from this side of the pipe into the rotating or reciprocating equipment, and then discharge the connection sealing device from it.