In order to modernize equipment management, enterprises should actively promote advanced equipment management methods and adopt equipment maintenance techniques based on equipment condition monitoring. Equipment condition monitoring and fault diagnosis techniques are prerequisites for preventive maintenance of equipment. In particular, heavy industry companies have strong work continuity and high requirements for safety and reliability. Through the promotion of condition monitoring, it is possible to gradually grasp the working status of large and medium-sized equipment such as pumps and fans to prevent accidental losses.
First, the current situation of equipment management before the pump, fan and other large and medium-sized equipment, the determination of the repair cycle is generally two kinds: cumulative or regular maintenance of the operating platform. According to the actual operating hours of the equipment and the actual operation of the equipment, determine the equipment repair cycle, cycle, or equipment operating conditions are poor, notify the maintenance personnel to carry out equipment overhaul, some equipment also based on years of experience, determine the size of the repair cycle, the pump One year is an overhaul cycle. During peak production periods every year, when more cooling water is needed, all pump groups are overhauled. However, the fan operation is relatively frequent. In order to increase the purification efficiency or ensure the normal feeding of the electrolytic cell, the inspection cycle may be set to six months. Both the method of determining the overhaul cycle according to the time of the station and the year are too old. To get out of the traditional maintenance model, we must rely on advanced scientific instruments as testing methods.
Second, the vibrometer equipped with Qinghai Aluminum Corporation in the equipment management agencies, according to the different work division, respectively, with different detection equipment, the Ministry of Energy and Equipment in particular equipped with Beijing Jinghang company's HG-3518 type instrument, there are Data acquisition fault diagnosis system, measuring parameters for acceleration, speed, displacement, temperature, speed. For the factory inspectors, equipped with a French 4576DA multi-function portable vibrometer, measuring parameters for the acceleration, speed, displacement, etc., mainly used to randomly detect the running status of equipment. The maintenance personnel who master the basic parameters are equipped with HG-2506 Pocket Vibrometer, which is produced by Beijing Jinghang Company. It is suitable for measuring acceleration, speed, displacement, etc. at low frequency (5Hz).
Third, the use of vibrometer in recent years, many companies in the equipment status monitoring using pulse vibrometer, oil analyzer, multi-channel chronograph and other instruments. Due to the lack of standardized management and technical guidance, after the instrument is delivered to the workshop, it is difficult to carry out this task because of different technical levels, unstable performance of the instrument itself, and inconvenient operations. However, after a period of exploration, each branch company of China Aluminum Corporation implemented a device inspection, introduced many advanced instruments, applied the vibration detector to the equipment status, played an important role in equipment maintenance, and promoted equipment management. Work to a new level.
Fourth, the measurement method and determination basis 1, measuring point selection: the use of vibration meter, the main equipment of the bearing and axial end of the test, and equipped with on-site detection record table, each measurement point must correspond to each other.
2. Measurement period: After the equipment is just overhauled or near to overhaul, it needs to be measured twice a week; during normal operation, it is measured once a month; if there is a significant change between the measured value and the last measurement value, the test density should be increased to Prevent accidents and cause breakdowns.
3, determination of measurement values: refer to the international standard ISO2372.
Speed: 600 to 1200r/min, vibration measurement range: 10 to 1000Hz.
Normally, when the equipment is in normal operation, the detection speed value is in the range of 4.5 to 11.2 mm/s (over 75 kW units) for monitoring purposes, and over 7.1 mm/s must be considered for major repairs. In addition to considering the motor capacity of the equipment, the determination of this value must also consider the aspects of strong work continuity, high safety and reliability.
After the application of the vibrometer in management, the company gained the following inspirations:
1. The use of a vibrometer to check the status of equipment can not be used as the only basis for determining equipment overhaul cycles, but it is very necessary as a reference condition. Because of the low speed of pumps, fans and other equipment, the damage caused by vibration is not unique. For example, there are no problems with the vibrometer, but the impeller is seriously corroded and an overhaul is required. Therefore, the determination of equipment overhaul cycle should be comprehensively considered from the aspects of vibration meter test results, equipment operation time and efficiency.
2. The application of vibrometer test is also very necessary as a means of acceptance after equipment overhaul. It should be pointed out that since the equipment is of different ages, the inspection value of its acceptance shall not be uniformly stipulated. It shall be based on the test value before the overhaul of the pump group being accepted and the inspection value after acceptance of the repaired value shall not be used. Uniform regulations should be based on the inspection value of the pump group before acceptance, and the revised value should be lower than the pre-repair value. In addition, the application of vibrometer can also find the installation of the pump group (including poor alignment, loose anchor bolts long-term operation), as well as the pump cavitation phenomenon.
In short, the vibrometer is used in conjunction with other detection instruments to facilitate the analysis of the operational status of the equipment. Such as vibrometer with oil analyzer, motor fault detector, alignment instrument and other instruments used to more accurately determine the operation of the equipment.
First, the current situation of equipment management before the pump, fan and other large and medium-sized equipment, the determination of the repair cycle is generally two kinds: cumulative or regular maintenance of the operating platform. According to the actual operating hours of the equipment and the actual operation of the equipment, determine the equipment repair cycle, cycle, or equipment operating conditions are poor, notify the maintenance personnel to carry out equipment overhaul, some equipment also based on years of experience, determine the size of the repair cycle, the pump One year is an overhaul cycle. During peak production periods every year, when more cooling water is needed, all pump groups are overhauled. However, the fan operation is relatively frequent. In order to increase the purification efficiency or ensure the normal feeding of the electrolytic cell, the inspection cycle may be set to six months. Both the method of determining the overhaul cycle according to the time of the station and the year are too old. To get out of the traditional maintenance model, we must rely on advanced scientific instruments as testing methods.
Second, the vibrometer equipped with Qinghai Aluminum Corporation in the equipment management agencies, according to the different work division, respectively, with different detection equipment, the Ministry of Energy and Equipment in particular equipped with Beijing Jinghang company's HG-3518 type instrument, there are Data acquisition fault diagnosis system, measuring parameters for acceleration, speed, displacement, temperature, speed. For the factory inspectors, equipped with a French 4576DA multi-function portable vibrometer, measuring parameters for the acceleration, speed, displacement, etc., mainly used to randomly detect the running status of equipment. The maintenance personnel who master the basic parameters are equipped with HG-2506 Pocket Vibrometer, which is produced by Beijing Jinghang Company. It is suitable for measuring acceleration, speed, displacement, etc. at low frequency (5Hz).
Third, the use of vibrometer in recent years, many companies in the equipment status monitoring using pulse vibrometer, oil analyzer, multi-channel chronograph and other instruments. Due to the lack of standardized management and technical guidance, after the instrument is delivered to the workshop, it is difficult to carry out this task because of different technical levels, unstable performance of the instrument itself, and inconvenient operations. However, after a period of exploration, each branch company of China Aluminum Corporation implemented a device inspection, introduced many advanced instruments, applied the vibration detector to the equipment status, played an important role in equipment maintenance, and promoted equipment management. Work to a new level.
Fourth, the measurement method and determination basis 1, measuring point selection: the use of vibration meter, the main equipment of the bearing and axial end of the test, and equipped with on-site detection record table, each measurement point must correspond to each other.
2. Measurement period: After the equipment is just overhauled or near to overhaul, it needs to be measured twice a week; during normal operation, it is measured once a month; if there is a significant change between the measured value and the last measurement value, the test density should be increased to Prevent accidents and cause breakdowns.
3, determination of measurement values: refer to the international standard ISO2372.
Speed: 600 to 1200r/min, vibration measurement range: 10 to 1000Hz.
Normally, when the equipment is in normal operation, the detection speed value is in the range of 4.5 to 11.2 mm/s (over 75 kW units) for monitoring purposes, and over 7.1 mm/s must be considered for major repairs. In addition to considering the motor capacity of the equipment, the determination of this value must also consider the aspects of strong work continuity, high safety and reliability.
After the application of the vibrometer in management, the company gained the following inspirations:
1. The use of a vibrometer to check the status of equipment can not be used as the only basis for determining equipment overhaul cycles, but it is very necessary as a reference condition. Because of the low speed of pumps, fans and other equipment, the damage caused by vibration is not unique. For example, there are no problems with the vibrometer, but the impeller is seriously corroded and an overhaul is required. Therefore, the determination of equipment overhaul cycle should be comprehensively considered from the aspects of vibration meter test results, equipment operation time and efficiency.
2. The application of vibrometer test is also very necessary as a means of acceptance after equipment overhaul. It should be pointed out that since the equipment is of different ages, the inspection value of its acceptance shall not be uniformly stipulated. It shall be based on the test value before the overhaul of the pump group being accepted and the inspection value after acceptance of the repaired value shall not be used. Uniform regulations should be based on the inspection value of the pump group before acceptance, and the revised value should be lower than the pre-repair value. In addition, the application of vibrometer can also find the installation of the pump group (including poor alignment, loose anchor bolts long-term operation), as well as the pump cavitation phenomenon.
In short, the vibrometer is used in conjunction with other detection instruments to facilitate the analysis of the operational status of the equipment. Such as vibrometer with oil analyzer, motor fault detector, alignment instrument and other instruments used to more accurately determine the operation of the equipment.
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