新购买的500吨拉伸液压机使用前要进行的准备工作，首先得仔细阅读设备使用说明书，了解液压机设备的用途、技术性能、主要结构、设备精度标准、使用要求、技术要求、操用使用方法、试车注意事项等。消化好“液压系统图”，弄清液压系统的工作原理和性能要求，为此须明确液压、机械与电气三者的功能和彼此的联系、动作顺序和连锁关系，熟悉液压系统中各元件在设备上的实际位置，它们的作用、性能、结构原理及调整方法。还要分析500吨液压机液压系统各执行元件的动作循环和运动顺序及相应的油路、压力和流量。

1. operation test standard for newly purchased 500-ton stretching hydraulic press

1. The continuous idle running test time of hydraulic press shall generally be not less than 4h, in which the driving slider shall generally be not less than 2h for full stroke continuous running time, and the rest time (including the time used for relevant performance tests) can be used for single full stroke running test. If there is no continuous operation requirement, only a single full-stroke operation test (including the time used for relevant performance) shall be performed. For the finalized products produced in batch, only the factory test of relevant performance can be carried out under short load, but the 4h idle running test is allowed regularly.

2. The temperature rise and high temperature of the following parts shall be measured during the idle running time of the hydraulic press, which shall meet the following requirements. Generally, the stereotyped products produced in batches may not be measured, but sampling is allowed.

a) The temperature rise of the sliding bearing shall not exceed 35 ℃, and the high temperature shall not exceed 70 ℃;

B) The temperature rise of the rolling bearing shall not exceed 40 ℃, and the high temperature shall not exceed 70 ℃;

c) The temperature rise of the slider strip and the guide rail shall not exceed 15 ℃, and the high temperature shall not exceed 50 ℃;

d) The oil temperature in the oil tank (or the oil temperature at the inlet of the hydraulic pump) shall not exceed 60°C.

3. Measure the main motor power during the idle running time.

4. The 500-ton stretching hydraulic press shall check all pipelines, joints, flanges and other connecting joints of high-pressure and low-pressure hydraulic systems, lubrication systems, cooling systems and air pressure systems within the idle running time, which shall be well sealed and free of external leakage and mixing of oil, water and gas.

5, hydraulic press noise sound power level, sound pressure level should be measured in accordance with the provisions of the relevant standards.

Operation and debugging method of newly purchased hydraulic press in 2.

1. Inching: first inching the pump to observe whether the steering of the oil pump is correct. If the power supply is reversed, there will be no oil output, and sometimes accidents may occur. Therefore, remember that only "inching" can be performed at the beginning of operation ". When the pump sound is normal and the oil is continuously output and there are no other abnormal phenomena, it can be put into continuous operation and no-load debugging.

2. No-load debugging: line 10-20 minutes low-speed operation, sometimes it is necessary to unload the connection between the oil cylinder or hydraulic motor and the load. Especially in the cold season, this kind of low-speed operation without load (warm-up operation) is particularly important, some equipment often have strict requirements, and some are equipped with heaters to heat up the oil tank. Run a test run for actions that can operate at low speed and low pressure.

3. Gradually and uniformly boost the pressure and accelerate. The specific operation method is to repeatedly tighten and immediately loosen the pressure or flow adjustment handles of the overflow valve, flow valve, etc. several times, and observe the pressure rise and fall changes and the speed changes of the actuators with a pressure gauge. Conditions, heat, vibration and noise of the oil pump. Problems should be analyzed and solved in a timely manner.

4, according to the action cycle table combined with electrical machinery to debug each individual action, and then turn to the cycle action debugging, check whether the action is coordinated. In the process of debugging, there will be some problems, such as crawling, impact and non-commutation. For complex domestic and equipment, if there are difficult to solve problems, we can consult together, and if necessary, we can turn to oil pressure equipment manufacturers.

5. After entering the full load debugging, that is, the working pressure and large (small) working speed test are carried out according to the technical performance of the 500-ton stretching hydraulic press equipment to check the power, heat, noise and vibration, high-speed impact, low-speed crawling, etc. Check the oil leakage of each part, often no-load leakage when the pressure increases. Find problems, eliminate them in time, and make written records. If it is normal, the test piece can be processed. After the test run is completed, the machine tool shall be restored after shutdown, and detailed debugging records shall be kept on file. Some equipment commissioning records can be used as the basis for claims.