Installation process and installation precautions of elastic pin coupling

Published: 2018-07-22

Common couplings are widely used.It is divided into rigid coupling andElastic pin couplingTwo kinds.Rigid couplings are divided into rigid fixed couplings and rigid movable couplings.Rigid fixed coupling requires the centering of the two connected shafts, and this centering accuracy will not change during work.Therefore, although this type of coupling has a simple and inexpensive structure, its use is too demanding, so it is rarely used.However, in some occasions, rigid fixed couplings are used, such as the occasions where the axial force needs to be transmitted through the star-shaped elastic pin coupling, or when other couplings for certain heavy-duty units cannot meet the torque transmission requirements.The components of the rigid movable coupling can move relative to each other. The relative displacement of the axis is compensated by the relative mobility, so that there is little axial displacement, radial displacement and angular displacement between the two shaft axes. Displacement.The familiar and widely used gear couplings belong to this category, and were once the choice of high-speed and high-power couplings.This type of coupling provides lubrication due to the relative movement between the components, and its compensation ability is restricted by the relative sliding speed of the movable element and the lubrication conditions.For example, the relative sliding speed of the tooth surface of the gear coupling should not be greater than 0.12m/s. Therefore, the angular compensation ability of this coupling is very small at high speed and heavy load.In order to improve this compensation capability, gear couplings are often made of drum-shaped teeth, with complex structures, and once there is a problem with the lubrication, its use effect and life will be reduced. This has promoted the development and development of dry couplings. use.

The elastic pin coupling relies on the locking force of the pin group to generate the frictional moment on the contact surface, and compress the rubber elastic sleeve to transmit the torque.It is suitable for small and medium-power shafting transmissions with good rigidity of the installation base, high centering accuracy, low impact load, and low vibration reduction requirements.

The elastic work is compressed and deformed. Because the thickness of the elastic sleeve is thin, the volume is small, and the elastic deformation is limited, the elastic pin coupling can compensate the axis displacement and elasticity, but the allowable compensation amount for the axis displacement is less, and the elasticity is more weak.

The elastic pin coupling is simple in structure, easy to manufacture, does not require lubrication, does not need to be bonded with metal vulcanization, it is convenient to change the elastic sleeve, does not need to move the half coupling, and has the properties of compensating the relative deviation of the two shafts and damping.

The elastic pin coupling is a pin made of several non-metallic elastic materials, which is placed in the flange hole of the two halves of the coupling, and the two halves of the coupling are connected by the pin. The coupling has a simple and easy structure. It is more convenient to manufacture, assemble, disassemble and replace the elastic element, without moving the two halves of the coupling.The material of the elastic element (column pin) is generally selected from nylon, which has the ability to compensate for the deviation of the two axes in a small amount. The elastic part is sheared when working, and the workability is poor. It is only suitable for the medium-speed transmission shaft system with very low requirements, not suitable for workability More demanding conditions.

Installation technology of elastic pin coupling

The elastic pin coupling is a new type of high-performance coupling developed by our country. It combines the advantages of different structures of the existing standard elastic pin couplings, such as the advantages of the plum blossom coupling: the elastic element is compressed and the structure is simple. , High sex.Overcome the shortcomings of the plum blossom coupling: when changing the elastic element, move the half coupling, the double flange plum blossom coupling and the moment of inertia, the application range is limited.When transmitting the same torque, the radial dimension is much smaller than that of the GB4323 elastic pin coupling, with light weight and small moment of inertia.

The elastic pin coupling has good performance in compensating the axial, radial and angular axis deviation, good vibration reduction performance, simple structure, stable operation, no noise, no lubrication, simple maintenance, convenient assembly and disassembly, and good manufacturability , Low cost, can be derived into a variety of structural forms, good versatility, wide application range, easy to use and popularize. One of the outstanding advantages of this coupling is that it only needs to be suitable for axis alignment and installation is difficult, and it is required to minimize auxiliary man-hours. Working environment.

Elastic pin couplings are usually cut from metal round bars. Commonly used materials are aluminum alloy, stainless steel, and engineering plastics.The elastic pin coupling uses a parallel or spiral groove system to adapt to various deviations and transmit torque.Elastic pin couplings usually have good performance and price advantages. In many practical applications of stepping and servo systems, the integrated design enables the elastic pin coupling to transmit torque with zero clearance and requires no maintenance. The advantages.The elastic pin coupling mainly has the following two basic series: spiral groove type and parallel groove type.

Use and maintenance of elastic pin coupling:

1. When assembling, remove burrs and clean all parts

2. When assembling, the two middle welding fork bearing holes must be on the same plane, the allowable difference should not exceed 1°, the spline part should slide freely, and the joint should rotate flexibly

3. Clean the surface, except for the flange end face and the end face key with anti-rust grease, brush the anti-rust primer once, and then spray paint (no paint).

4. Regular lubrication, it is recommended to inject oil once a week, and once a day under high temperature conditions.

Precautions for installation of elastic pin coupling:

1) Elastic pin coupling positioning screw fixation: The gap between the two positioning screws is 90º; the fixed shaft is locked, the traditional fixing method, because the front end of the screw contacts the shaft center, it may cause damage or damage to the shaft center. Difficult to disassemble.

2) Elastic pin coupling clamping screw fixation: Use the tightening force of the hexagon socket bolt to shrink the slit and clamp the shaft tightly.This method is convenient to fix and disassemble, and will not cause damage to the shaft, so it is a very common fixing method.

3) Elastic pin coupling keyway type fixation: suitable for high-torque transmission. In order to prevent axial sliding, it is usually used together with positioning screws and clamping screws.

4) The elastic pin coupling is fixed with D-shaped hole: Normally, if the shaft of the motor is D-shaped, if the positioning screw cannot be fixed, the hole of the coupling can be processed to correspond to the size of the motor shaft D-shaped holes are fixed with positioning screws, so there is no need to worry about slipping.

5) Expansion sleeve fixing: tighten the four positioning screws on the end of the Lingsi coupling to compress the account cover. It is suitable for the connection and fixation of some stepping motors and servo motors with large torque, such as expansion sleeve elastic pins. Couplings, expansion sleeve plum blossom couplings, expansion sleeve bellows couplings, expansion sleeve elastic pin couplings, etc.