The hydraulic drive unit for the milk rotary turntable consists of a hydraulic motor and a reducer.

The hydraulic motor uses No. 46 anti-wear hydraulic oil. The hydraulic system provides pressurized oil, converting pressure energy into mechanical energy. The reducer then outputs high torque. The reducer uses No. 90 industrial gear oil. The normal gear oil change cycle for the reducer is: the first oil change after 3 months of operation, then every 6 months thereafter, to ensure normal lubrication. The hydraulic system oil change cycle is the same. It's important to note that after releasing the hydraulic oil, the oil tank must be thoroughly cleaned. After several months of operation, a thick layer of oil sludge will accumulate at the bottom of the tank. This sludge is fatal to the hydraulic system, often causing hydraulic valves to jam and increasing wear on the hydraulic pump and motor. Therefore, clean oil is crucial for the normal operation of the entire milk rotary turntable.

Other hydraulic system maintenance: Check the suction and return oil filters for blockages about once a month. If there is any debris, remove it immediately. Listen to the sound of the hydraulic system during normal operation; any unusual noise should be investigated immediately. The pump will produce foam and unusual sounds when it is sucking air; regularly listening to the hydraulic pump station can help prevent major system failures.

Also, regularly monitor the oil temperature gauge. Milk rotary turntables generally operate continuously, making oil temperature control crucial because increased oil temperature accelerates wear on all hydraulic components. It's recommended to operate below 50 degrees Celsius. Because the oil temperature gauge shows the temperature of the hydraulic oil tank, when the gauge shows 50 degrees, the actual hydraulic motor and pump are already operating at around 65 degrees. Therefore, the temperature indicated by the oil temperature gauge must be kept below 50 degrees. It is recommended that all farms equip their hydraulic systems with water coolers to significantly extend the service life of the milk rotary turntable.

The hydraulic drive unit is the actuator on the milk rotary turntable and is therefore extremely important. Regular maintenance is essential. In addition to periodic replacement of the reducer gear oil, the following points must be noted when replacing a hydraulic drive unit: ① Ensure parallelism between each hydraulic drive unit and the turntable. Ensure that the rubber wheels mesh parallel with the turntable. If the rubber wheels wear easily or the hydraulic drive unit frequently fails, this should be investigated. ② A turntable is driven by four hydraulic drive units. During installation, ensure that the four drive units are evenly stressed; that is, the tension of the springs is crucial. If adjusted too loosely, the drive unit cannot output torque; if adjusted too tightly, it will cause damage to the drive unit bearings and severe rubber wheel wear. Therefore, proper installation is essential for the normal operation of the milk rotary turntable. ③ After the hydraulic motor leakage oil pipe comes out, it should immediately go upwards to ensure that the hydraulic motor housing is filled with hydraulic oil, because the lubrication of the hydraulic motor relies on the hydraulic oil itself, and the leakage oil pipe must directly return to the oil tank; it should not be connected to the main return oil line or the return oil filter. This problem occurred previously at the Feding farm. The leakage oil pipe returned to the oil tank and connected to the return oil filter; at that time, the return oil filter element was clogged, causing the leakage oil to not return normally to the oil tank, increasing the pressure in the hydraulic motor housing, leading to oil leakage. Therefore, the leakage oil pipe must return directly to the oil tank. ④ If maintenance personnel find that the milk rotary turntable output is weak, they can check the amount of oil flowing from the hydraulic motor leakage oil pipe. The milk rotary turntable is driven by four hydraulic motors, each with a separate leakage oil pipe. Maintenance personnel can judge the operating status of each hydraulic motor based on the leakage oil flow from each motor. If the leakage oil from a hydraulic motor is spraying, the hydraulic motor is damaged and should be replaced as soon as possible. If the leakage oil from all four hydraulic motors is normal but the turntable is still weak, then the rubber wheels should be checked for normal engagement. If the rubber wheels are also normal, the cause may be damage to the hydraulic pump or jamming of a hydraulic valve.

Daily maintenance is essential to ensure the normal continuous operation of milk rotary turntables on farms. Through daily maintenance and inspection, problems can be identified early to prevent major accidents. It is also important to regularly provide technical training to maintenance personnel to improve their technical skills.

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Measures to prevent oil leakage:

1. From the analysis and calculation in the previous chapter (Hydraulic Motor Oil Leakage Analysis), it is known that oil leakage is caused by excessively high oil pressure inside the motor housing. Therefore, all leak prevention measures should aim at reducing pressure. The specific methods are as follows.

2. Reasonable configuration of drain pipes: Many hydraulic technicians do not pay much attention to the configuration of drain pipes, believing that it is sufficient to directly return oil to the tank, and the pipe diameter does not matter. From the formula for calculating the head loss, it can be seen that the head loss is inversely proportional to the fifth power of the pipe diameter. Under the same other conditions, if the drain pipe diameter is changed to 10, then the head loss: Pf = 0.15 MPa. In this case, the requirements for drain pressure can be fully met.

3. In addition, the influence of pipe length should also be noted, because there is a linear relationship between pipe length and head loss. Under the same conditions, if the pipe length is doubled, the head loss will also double. Therefore, special attention should be paid when the drain pipe is long.

4. Reasonably determine the flushing oil flow rate, because if the flushing oil flow rate is too small, it will not have a cooling effect, but if the flushing is too large, it will increase the drain resistance.

5. The correct flushing flow rate can be found in the technical data of relevant manufacturers, or it can be determined by calculation based on the heat balance conditions.