Due to the rapid update of equipment, the group hoist electric hoist now appears in a wide range of public view. With the large increase in the number of users, some small problems of the group hoist electric hoist will also increase. Today I will explain to you the group hoist electric hoist Solutions to common failures.
1. Stopping and sliding interval during braking exceeds the requirements of the rules
When the group hoist is used for a long time, the pressure of the brake spring will be reduced, but it should be checked during the operation. Before lifting a heavy object, the brake must be adjusted, checked, and repaired. In some cases, after adjusting the brake nut, the sliding interval of shutdown still exceeds the requirements of the rules. If the operator encounters this situation, he needs to think about whether it is caused by other reasons. First, the brake ring must be disassembled to check the brake surface. Whether there is oil stains, if there is oil stains, there will be slippage, and the sliding interval exceeds the requirements of the rules. At this time, if the adjustment of the brake nut is not effective, then only need to thoroughly clean the brake surface (cleaning easy to use light gasoline); If the brake ring is loose or damaged, the brake ring cannot ensure timely and effective braking, as long as the brake ring is replaced immediately; if it is a group crane electric hoist motor coupling, the coupling is not working or stuck , After the group hoist electric hoist is stopped, the brake ring and the rear end cover cone surface are not touched or cannot be touched, which makes the group hoist electric hoist brake good or bad. If this situation is encountered, the coupling should be Repair or replace. Brake pressure tension spring operation for a long time will reduce the tension spring force. During the period of time after the stop is selected, the tension spring should be replaced. If the operator finds that the brake ring is not damaged, only the brake ring and the rear end cone surface Poor touch, when braking, the braking surface is touched too little, and the braking force is too small, so that the glide interval exceeds the requirements of the rule. When overhauling, the location of the bad touch should be found and carefully repaired to increase the touch during braking Noodles, when you find it impossible to repair, you need to replace the accessories;
2. Abnormal noises appear during the operation of the group hoist electric hoist
Many problems with the group hoist electric hoist, such as the manipulation of electrical appliances, motors or reducers, etc. If you listen carefully, the group hoist electric hoist is often accompanied by abnormal noise. The location of these noises and the unevenness and sound are related to the problems that arise. During the maintenance, the editor's suggestion to the operator is that you must listen more and read more. You can use or according to the characteristics of the faulty sound to determine or further determine the direction of the sound, find and repair the fault.
(1) The abnormal noise starts from the reducer, and the reducer is defective (such as the lack of smooth oil in the gearbox or bearings, the gears are worn or damaged, the bearings are damaged, etc.). At this time, you should stop to check and first determine the gearbox or the gearbox of the gearbox. Whether the bearing is lubricated with smooth oil before use, and whether the smooth oil is replaced regularly during operation. If it is not smooth as required, the reducer will emit a high "buzzing" sound, and excessive wear or damage to gears and bearings may occur. Some people may think that the reducer temporarily does not add or add some smooth oil at will, and can still work without serious problems. This kind of thinking is wrong. When a company installed an electric hoist, workers once forgot to fill the reducer box with lubricating oil, and after about a day of use, the reducer made a noise. After the maintenance personnel opened the reducer, it was found that the gear was worn due to excessive wear. And void. The bearing of the reducer is damaged, similar to the problem of the motor bearing, and there is abnormal noise near the bearing. In order to avoid problems later, all need to be immediately dismantled for repair or replacement to eliminate the problems and reduce noise.
(2) The abnormal noise of the motor should be stopped immediately to check whether the motor is single-phase operation. Whether the bearing is damaged, the shaft of the coupling is distorted, or "brooming" and other defects, these will make the motor have abnormal and noisy noise Different sounds have different noise directions, bumps and sounds. When single-phase operation, the motor will have a regular "buzzing" sound; when the bearing is damaged, it will be adjacent to the bearing, which is constantly accompanied by "buzzing" Sound; and if the coupling shaft is distorted, or the motor appears to be slightly bored, the motor will have a very high "buzzing" sound, which is sometimes accompanied by a sharp and sharp sound. It is suggested that you should find out the faults and causes according to the different noises, and the operator should check the items one by one, then the motor may return to normal normally. When the faults of the motor have not been dealt with, the use of hoist is strictly prohibited.
(3) Anomalous noise occurs on the control circuit, announcing "hum" noise, generally the touch device presents a fault (such as poor contact of the contact of the communication touch device, the voltage level does not match, the magnetic core is stuck, etc.), to deal with the faulty touch If the device cannot be repaired, it is necessary to replace it. After the problem is resolved, the noise will be eliminated by itself.
3. The group hoist electric hoist does not work after pressing the start switch
It is common for the group hoist electric hoist to be unable to operate because it has not been connected to an additional operating voltage. There are generally three conditions:
(1) Whether the power supply system supplies power to the group hoist electric hoist power supply, generally use a test pencil to test, if there is no power supply, wait for the power supply before operating;
(2) The electrical appliances of the main and control circuits of the group hoist are damaged, the circuit is disconnected or the touch is bad. The group hoist electric hoist generally shows this situation. When the maintenance personnel perform maintenance, it is often necessary to avoid sending the main and control circuits. If the power of the three-phase motor is out of phase and the motor is burned, or the group hoist electric hoist motor is suddenly energized, causing irreversible harm. Be careful to disconnect the group hoist electric hoist motor from the power line and only send power to the main Control circuit, and then start and stop the switch, and then the operator checks and analyzes the operating status of the control electrical appliances and circuits, and replaces the potentially problematic electrical appliances or circuits. When the operator confirms that the main and control circuits are free from problems, Test drive
(3) The voltage of the motor terminal of the group hoist electric hoist is more than 10% lower than the extra voltage. After the motor is started, the torque is too small, which causes the group hoist electric hoist to not move the goods and cannot be operated. The operator will check it later. Use a suitable multimeter or voltmeter to measure the input voltage. If it is confirmed that the group hoist electric hoist is unable to start because the voltage is too low, wait for the system voltage to recover and then use the group hoist electric hoist. In some cases, the voltage of the group hoist electric hoist motor is normal, but the group hoist electric hoist does not work, which needs to be considered for other reasons, such as: the motor is burned, the motor needs to be replaced during maintenance; the hoist will not be used for a long time, or It is due to various reasons that the brake wheel and the end cover are rusted. The motor will only make a "hum" sound. Under the physical state, it cannot be rolled, and the group hoist cannot work. The suggestion here is that you should first remove the brake wheel, clean the rusty surface, and then start the test from the beginning; if the motor is bored, it will also prevent the motor from rolling. If the operator finds this situation, he should stop using it immediately. Test, because it is necessary to overhaul or replace the motor at this time to ensure the normal operation of the hoist. It should also be mentioned here that the use of electric hoists in production is prohibited. When the quality of the goods exceeds the load capacity of the electric hoist, the hoist will often hang, and the motor may only make a hum. There will not be any operation behavior, even the motor will be burned when the situation is serious, and even a major safety accident will be directly caused. At this time, the machine must be stopped immediately to reduce the goods and allow the group hoist to operate within the rated range.