Mechanical research and application of mechanical hydraulic pressure in the hydraulic system of the hydraulic press and the rational replacement of the equipment section of Hu Jianping Nanhai Automobile Industry Co., Ltd. Reconstruction of Nanhai 528200, Guangdong. Extend the life of working oil and reduce equipment failure. Keywords working oil; slide valve adhesion; suspension pollution; particles; electromagnetic filter, 00 mechanical press hydraulic system working oil as power transmission medium and lubricating oil as a sliding part. It plays a very important role in preventing the life and efficiency of metal surface rust components. However, in actual work, due to lack of attention, not paying attention to the correct use and management of working oil, the resulting failure and waste is very much.
1 Mechanical presses caused by the working oil caused by the working oil during the use of the working oil will cause the action of the liquid parts + low stability and abnormal life of the components, aging corrosion of the village materials, making the equipment unstable and affecting produce.
In the process of maintenance and management, the most common weather temperature and long-term use of equipment, resulting in oil temperature rise, viscosity reduction, causing internal leakage of hydraulic components, resulting in abnormal actuator action, suspended pollution particles in the working oil The most common failure occurred. If the blue matter enters the working oil and floats for a long time, the pipeline is blocked, the control valve core is not tightly sealed, the sliding surface of the equipment is worn, and the filter element is blocked. Our factory has a large-scale mechanical press, with an annual fuel consumption of 13600 and an average of 360 electric dresses per unit; then the filter is replaced, and the needle is paid for this condition. After the mold repairer is repaired in the press, The iron scraps left on the guide rails flowed back to the fuel tank along the lubricating oil. For a long time, the particles in the lubricating oil exceeded the standard, contaminated the working oil and caused malfunction, and the lubricating oil was frequently replaced and wasted.
Examples of faults caused by contaminated working oil and preventive measures Fault conditions Mechanical press table Work clamp clamping jacking mechanism hydraulic circuit part and specifications 1.
Positioning electromagnetic reversing valve diameter 20; electromagnetic coil voltage This circuit is used to pressurize the moving table clamping jacking cylinder, the electromagnetic reversing valve is pressed back to the reversing position by the spring force, the cylinder must be reversed, but Even if the power is turned off after the pressure is applied, the electromagnetic reversing valve is not pressed back by the spring force, or after the demagnetization 58 is pressed back by the spring force, and the normal operation cannot be performed.
Judgment of the cause of the fault and inspection of the electrical signal 1 check, the adhesion phenomenon of the magnetic reversing slip 1 is energized to the electromagnetic reversing valve, and after a short time of pressurization at the 2 position, the magnetic reversal is immediately switched to 1 s position.
If the pressurization hold time is within, the action is basically normal. When the pressurization time is equal to or higher, the number of occurrences of abnormal operation increases, and when the pressurization time reaches about 15, the probability of abnormal operation of the shell 1 is about 801. Even if there is a malfunction, there is a time to move the valve. There is also a mechanical vibration note that is added to the valve. Turn down the 32nd page of the mechanical research, and the application line is normal, with the same model and working properties. The 1 chestnut was compared with the relevant parameters. For example, 3 can be seen from the average of 8 days per hour. Under the premise of ensuring the pressure of the whole plant pipe network, the 2 pumps with the slip clutch installed and the non-slip clutch are not larger than the output. The power consumption is saved, and the specific ten calculation results, such as PfIL1rosC1, are known from Equation 1. The power consumption and consumption of the two pumps are as follows: For the pump that does not install the slippery pump, there is a pump for installing the slippery and clutch.钌 Derived from the formula, the pump can save more electricity than Guanghe. A=AA2 According to the current electricity consumption of our factory, 0.42 yuan per kWh, the annual electricity savings can be 10,000 yuan. The equipment is small investment of 68,000. Only half time The investment cost can be recovered.
In practical applications, after installing the slip clutch, the operator does not need to open the valve frequently to adjust the process, as long as it is realized by the electric controller. Adults reduce the labor intensity of workers. The guarantee for the production of Anling 6 The final operation from the installation of the equipment proves that the use of the slip clutch on the high-power water pump has achieved significant energy-saving effects. It plays a big role in stabilizing the process, facilitating operation and safe production.
In the application of higher frequency motor than frequency conversion speed regulation, it is a kind of project with small investment and quick effect. If you install it on multiple devices and implement automatic control, the effect will be more obvious.
1 Gao Shenqin. Chemical machine Kun. Beijing Chemical Industry Press 1992 Xi Xu Zhenmao. Frequency conversion speed control device and its commissioning operation and maintenance 1. Beijing Weapon Industry Press, 1985 3 Yusokolov. Inverter Shenzhen. Beijing Ordnance Industry Press, 1989.
3 Disposal and preventive measures Disintegration of the magnetic switch valve. Call the sandpaper to remove the burrs from the body and the sliding edge, and clean it with gasoline.
Install the 1st filter of the neodymium directional control valve with a filter viscosity of 1 to remove the dust, and install the magnetic filter 01 button 3 before the inlet of the oil pump to remove more than 5 iron scraps from the oil.
2 strengthen the inspection. Reasonable replacement of working oil The method for determining the working oil traits is stipulated in the machinery industry standard and other standards. The replacement of working oil is in the actual situation, it is important and necessary to replace it in advance, and the equipment is operated by the household equipment. All of these instruments are equipped. According to the actual conditions and conditions of our factory, we mainly measure the weight of the particles in the oil, and determine whether it exceeds the standard and decide to replace it with 6. When it is expired, it will be replaced or it will be a lot of system failures. Replace if the road is blocked by a filter plug. We call the standard according to the ship 81050.7, and use the precision test to replace it according to the situation, avoiding waste and reducing downtime.
3 Precautions for replacement of working oil Pay attention to the following when replacing working oil.
The heart of the Zhongzheng Temple in the entire system should not be exhausted from the working oil in the organization. Disassemble the filter of the whole system, check the filter element, and the report needs to be cleaned and replaced. The residual oil in the tubing is also removed, and the size and quantity of the attached matter are checked, and the source of the inference is inferred. Remove the part of the return line that leads to the fuel tank in the circuit and check the internal rust. The inside of the fuel tank must be carefully cleaned with light oil, etc., and the state of anti-rust treatment should be checked. The top of the fuel tank should be clean and the parts of the ventilation unit should be replaced. If there is a lot of residual or attached sludge in the piping, clean it with a cleaning oil and completely remove the cleaning oil. The new working oil is put into the fuel tank starting pump, and the part that is returned from the circuit at the earliest is to be discharged. For the residual oil in the cylinder, the oil port can be removed to move it to the outside. 9 The amount of residual oil allowed to be mixed into the new oil is 5 or less, and should be as small as possible. Use, 40 fine oil filter car to set the replacement of the oil, the cockroach is equipped with a magnetic filter and a graded filter, after the simmering oil 2 from the fuel tank to take the working oil sample. Use it as a new oil for the device. And as a criterion for the future work of smashing goods =
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