Application Practice Of Flexible Coupling In Transmission System Of Sandwich Panel Line

In the modern manufacturing industry, the sandwich panel line has become an essential equipment in the fields of construction, energy conservation and environmental protection, and industrial storage due to its high efficiency, automation and high-quality production capacity. The transmission system, as the core power transmission component of the sandwich panel line, directly determines the stability, production efficiency and product quality of the entire production line. Among the numerous components of the transmission system, the flexible coupling plays an irreplaceable role. It not only undertakes the task of connecting the power source (such as motor) and the working equipment (such as uncoiler, roll forming machine, laminating machine), but also compensates for the relative displacement between the shafts caused by installation errors, equipment operation vibration, thermal expansion and contraction, so as to protect the transmission system components, reduce energy loss and ensure the smooth operation of the entire production line. With the continuous improvement of the automation level of the sandwich panel line and the increasingly complex working conditions, the performance requirements of the flexible coupling are also constantly improving.

The flexible coupling is a mechanical component used to connect two shafts (active shaft and driven shaft) in the transmission system, which can transmit torque and motion while allowing a certain degree of relative displacement between the two shafts. Unlike rigid couplings that require strict alignment between the two shafts, flexible couplings have the characteristics of flexibility and elasticity, which can effectively compensate for axial, radial and angular misalignment between the shafts, and absorb vibration and shock generated during equipment operation. In the transmission system of the sandwich panel line, the working environment is often accompanied by high load, continuous operation, and certain vibration and temperature changes. The flexible coupling can adapt to these harsh working conditions, reduce the impact of vibration on the motor, reducer, bearing and other key components, and prolong the service life of the entire transmission system. The working principle of the flexible coupling is mainly based on the elastic deformation of its own elastic components. When the active shaft transmits torque to the flexible coupling, the elastic components (such as rubber, polyurethane, metal diaphragm, etc.) will produce appropriate elastic deformation, which not only realizes the transmission of torque and motion, but also buffers the impact and vibration, and compensates for the relative displacement between the shafts. This unique working principle makes the flexible coupling an indispensable key component in the transmission system of the sandwich panel line, which is related to the stable operation and production efficiency of the entire production line.

In the transmission system of the sandwich panel line, different types of flexible couplings are selected according to the different working conditions and transmission requirements of each equipment. Common types include elastic sleeve pin coupling, plum blossom elastic coupling, diaphragm coupling, serpentine spring coupling, etc. Each type of flexible coupling has its own structural characteristics and applicable scenarios, and the correct type selection is the premise to ensure its application effect. The elastic sleeve pin coupling is composed of two half-couplings with pin holes, elastic sleeves and pins. The elastic sleeve is made of rubber or polyurethane material, which has good elasticity and wear resistance. It is suitable for the transmission occasions with small load, low speed and small misalignment, such as the transmission connection between the motor and the small auxiliary equipment in the sandwich panel line (such as the glue spraying pump, dust suction fan). This type of coupling has the advantages of simple structure, low cost, easy installation and maintenance, and can effectively absorb small vibrations and compensate for slight misalignment. However, its bearing capacity is limited, and it is not suitable for high load and high speed transmission occasions.

The plum blossom elastic coupling is composed of two half-couplings and a plum blossom-shaped elastic body. The elastic body is usually made of polyurethane or rubber, which has good elasticity, impact resistance and wear resistance. It is widely used in the transmission system of the sandwich panel line, especially in the connection between the motor and the roll forming machine, laminating machine and other key equipment. This type of coupling has the characteristics of compact structure, large bearing capacity, good vibration absorption effect, and can compensate for axial, radial and angular misalignment. It is suitable for high load, medium and high speed transmission occasions. At the same time, the plum blossom elastic body is easy to replace, which can reduce the maintenance time and cost. The diaphragm coupling is a kind of metal flexible coupling, which is composed of two half-couplings and a metal diaphragm. The metal diaphragm is made of high-quality stainless steel or alloy steel, which has high strength, high temperature resistance and corrosion resistance. It is suitable for the transmission occasions with high precision, high speed and high load, such as the connection between the motor and the reducer in the sandwich panel line, and the connection between the reducer and the main transmission roller. This type of coupling has the advantages of no lubrication, long service life, high transmission precision, and can compensate for angular and axial misalignment. It is especially suitable for the occasions where the transmission precision is required and the working environment is harsh. The serpentine spring coupling is composed of two half-couplings, serpentine springs and spring seats. The serpentine spring is made of high-quality spring steel, which has good elasticity and fatigue resistance. It is suitable for the transmission occasions with large load, large vibration and large misalignment, such as the connection between the motor and the uncoiler in the sandwich panel line. This type of coupling can effectively absorb large vibrations and shocks, compensate for large radial and angular misalignment, and has a long service life and strong adaptability to harsh working conditions.

The type selection of flexible coupling in the transmission system of the sandwich panel line needs to be based on the actual working conditions of the production line, and comprehensively consider factors such as transmission torque, rotating speed, misalignment, working temperature, installation space and environmental conditions. First of all, the transmission torque is the core factor of type selection. The rated torque of the selected flexible coupling must be greater than the actual working torque of the transmission system to ensure that the coupling will not be damaged due to overload. In the sandwich panel line, the transmission torque of different equipment varies greatly. For example, the uncoiler needs to bear a large torque when uncoiling the metal coil, so a serpentine spring coupling or a plum blossom elastic coupling with large bearing capacity should be selected; while the auxiliary equipment such as the glue spraying pump has small transmission torque, so an elastic sleeve pin coupling can be selected. Secondly, the rotating speed is also an important factor affecting the type selection. The higher the rotating speed of the transmission system, the higher the requirements for the balance and stability of the flexible coupling. For high-speed transmission occasions (such as the main transmission roller of the laminating machine), a diaphragm coupling with high balance and high precision should be selected to avoid vibration and noise caused by unbalanced rotation. Thirdly, the misalignment between the shafts should be considered. The misalignment between the motor and the driven equipment in the sandwich panel line is usually caused by installation errors, equipment deformation and thermal expansion. Different types of flexible couplings have different compensation capacities for misalignment. For example, the diaphragm coupling has strong compensation capacity for angular misalignment, while the serpentine spring coupling has strong compensation capacity for radial misalignment. Therefore, the type of coupling should be selected according to the type and degree of misalignment. In addition, the working temperature and environmental conditions should also be considered. If the working environment of the production line is high temperature (such as the vicinity of the heating device), a diaphragm coupling with high temperature resistance should be selected; if the environment is humid or corrosive, a coupling with corrosion resistance (such as stainless steel diaphragm coupling) should be selected. Finally, the installation space should be considered. For the occasions with limited installation space (such as the connection between the reducer and the small-sized roll forming machine), a compact plum blossom elastic coupling or diaphragm coupling should be selected.

The correct installation of the flexible coupling is the key to ensure its normal operation and service life. In the installation process of the sandwich panel line transmission system, the following points should be paid attention to. First of all, before installation, the surface of the coupling, the shaft end of the motor and the driven equipment should be cleaned to remove oil, rust, burrs and other impurities to avoid affecting the fit accuracy and transmission effect. At the same time, the size of the shaft hole of the coupling, the diameter of the shaft end and the fit clearance should be checked to ensure that they meet the design requirements. If the fit clearance is too large, it will cause loose connection and vibration; if the fit clearance is too small, it will cause difficulty in installation and even damage the shaft or coupling. Secondly, the alignment of the two shafts should be carried out. The alignment accuracy directly affects the operation stability of the flexible coupling and the entire transmission system. The common alignment methods include the百分表 method and the laser alignment method. For the general transmission system of the sandwich panel line, the百分表 method can be used for alignment; for the high-precision transmission system (such as the laminating machine), the laser alignment method should be used to ensure the alignment accuracy. The radial runout and axial clearance of the coupling should be controlled within the allowable range. Generally, the radial runout should not exceed 0.05mm, and the axial clearance should meet the design requirements (usually 2-6mm). If the alignment is not accurate, it will cause additional torque and vibration, which will damage the coupling, bearing and other components. Thirdly, when installing the coupling, the installation method should be selected according to the type of coupling and the fit form. For the small-sized coupling with clearance fit, the hammering method can be used, but a copper plate or wooden block should be padded at the shaft end to avoid directly hitting the coupling end face and causing damage. For the large-sized coupling or interference fit coupling, the press fitting method or temperature difference method should be used. The press fitting method uses a press to apply axial force to press the coupling into the shaft end slowly, and the pressure value should be calculated according to the material yield strength to avoid excessive pressure causing deformation of the shaft or coupling. The temperature difference method is to heat the coupling (oil bath heating, temperature controlled at 120-150℃) or cool the shaft end (liquid nitrogen cooling) to make the coupling expand or the shaft end shrink, so as to realize easy installation. After installation, the coupling should be checked for loose connection, and the rotation should be flexible without jamming. Finally, after the installation is completed, the coupling guard should be installed to prevent accidental injury caused by the rotating coupling.

Daily maintenance of the flexible coupling is an important measure to prolong its service life and ensure the stable operation of the transmission system. In the daily operation of the sandwich panel line, the flexible coupling should be inspected and maintained regularly. First of all, regular inspection should be carried out. During the operation of the production line, the coupling should be checked for abnormal phenomena such as vibration, noise, oil leakage and loose bolts. If abnormal phenomena are found, the operation should be stopped immediately for inspection and treatment to avoid further damage to the equipment. After the production line runs for a certain period of time (usually 1-2 months), the coupling should be disassembled for comprehensive inspection, including checking the wear of the elastic components, the damage of the half-coupling, the looseness of the bolts and the wear of the keyway. For the elastic components (such as rubber sleeve, plum blossom elastic body), if there are cracks, aging, deformation and other phenomena, they should be replaced in time. For the half-coupling, if there are wear, deformation and other problems, they should be repaired or replaced according to the degree of damage. Secondly, lubrication maintenance should be carried out. For the flexible couplings that need lubrication (such as serpentine spring coupling), lubricating oil or grease should be added regularly to ensure that the moving parts are well lubricated, reduce friction and wear, and prevent corrosion. The type and amount of lubricating oil or grease should be in accordance with the design requirements, and the lubricating oil or grease should be replaced regularly to avoid the deterioration of the lubricating oil or grease affecting the lubrication effect. For the diaphragm coupling that does not need lubrication, the surface should be cleaned regularly to remove dust and impurities to prevent corrosion. Thirdly, the storage and maintenance of spare parts should be done well. Spare parts such as elastic components, bolts and half-couplings should be stored in a dry, clean and ventilated environment to avoid moisture, rust and damage. At the same time, the spare parts should be inspected regularly to ensure that they are in good condition and can be used at any time.

In the application process of flexible coupling in the transmission system of the sandwich panel line, due to various factors such as improper type selection, incorrect installation, insufficient maintenance and harsh working conditions, various faults may occur, which affect the normal operation of the production line. Common faults include coupling vibration, abnormal noise, damage to elastic components, loose bolts, etc. For each fault, corresponding handling measures should be taken according to the specific causes. Coupling vibration is a common fault, which is usually caused by inaccurate alignment, wear of elastic components, unbalanced rotation of the coupling, loose bolts and other reasons. When vibration occurs, the operation should be stopped first, and the cause should be checked one by one. If the vibration is caused by inaccurate alignment, the alignment should be re-carried out to adjust the radial runout and axial clearance to the allowable range. If the vibration is caused by wear of elastic components, the elastic components should be replaced in time. If the vibration is caused by unbalanced rotation of the coupling, the coupling should be balanced and corrected. If the vibration is caused by loose bolts, the bolts should be tightened according to the specified torque, and anti-loosening measures (such as double nuts, spring washers) should be taken. Abnormal noise of the coupling is usually caused by lack of lubrication, wear of moving parts, loose connection and other reasons. If abnormal noise is found, the operation should be stopped immediately, and the lubrication condition of the coupling should be checked first. If there is a lack of lubrication, lubricating oil or grease should be added. If the moving parts are worn, the worn parts should be repaired or replaced. If the connection is loose, the connection parts should be tightened. Damage to elastic components is mainly caused by overload, aging, high temperature and other reasons. When the elastic components are found to be damaged, they should be replaced in time, and the type and material of the elastic components should be selected according to the working conditions to avoid repeated damage. Loose bolts are usually caused by vibration during operation. The bolts should be tightened regularly, and anti-loosening measures should be taken to ensure that the bolts are firmly connected.

With the continuous development of the sandwich panel industry, the requirements for the performance and reliability of the transmission system are getting higher and higher, and the application of flexible coupling is also facing new challenges and opportunities. In the future, the flexible coupling used in the sandwich panel line transmission system will develop in the direction of high precision, high bearing capacity, long service life, maintenance-free and intelligence. For example, the development of intelligent flexible coupling with vibration monitoring, temperature monitoring and other functions can realize real-time monitoring of the operation state of the coupling, timely find potential faults, and improve the reliability and maintainability of the transmission system. At the same time, with the development of new materials and manufacturing processes, the performance of flexible coupling will be further improved. For example, the use of new high-strength, high-temperature resistant and corrosion-resistant materials can improve the adaptability of the coupling to harsh working conditions. The application of precision manufacturing technology can improve the manufacturing accuracy and balance of the coupling, reduce vibration and noise, and improve the transmission efficiency. In addition, the integration of flexible coupling with the transmission system of the sandwich panel line will be closer, and the type selection and installation will be more scientific and reasonable, so as to give full play to the role of the flexible coupling and promote the efficient and stable operation of the sandwich panel line.

In conclusion, the flexible coupling, as a key component in the transmission system of the sandwich panel line, plays a crucial role in ensuring the stable operation, improving production efficiency and prolonging the service life of the equipment. The correct type selection, standardized installation, regular maintenance and timely handling of faults are the key to ensuring the good application effect of the flexible coupling. In the actual application process, it is necessary to combine the working conditions and transmission requirements of the sandwich panel line, select the appropriate type of flexible coupling, strictly follow the installation procedures for installation, do a good job in daily maintenance and fault handling, so as to make the flexible coupling better serve the transmission system of the sandwich panel line. With the continuous progress of technology and the continuous improvement of the level of industrial automation, the application of flexible coupling in the sandwich panel line will be more extensive and in-depth, and will make greater contributions to the development of the sandwich panel industry.