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Analysis of the causes of instability in hydraulic lifts
Publish Time:
Apr 07,2022
Hydraulic lifts achieve lifting functions through the transmission of hydraulic oil pressure. Their scissor-type mechanical structure ensures high elevator stability, a wide working platform, and high load-bearing capacity, allowing for a wider range of high-altitude operations. Suitable for multiple people working simultaneously, it makes high-altitude operations more efficient and safer.
Hydraulic lifts achieve lifting functions primarily through the transmission of hydraulic oil pressure. Their scissor-type mechanical structure ensures high elevator stability, a wide working platform, and high load-bearing capacity, expanding the high-altitude operation range and making it suitable for multiple people working simultaneously, thus enhancing high-altitude operations.
A hydraulic lift is a type of lifting machinery composed of a walking mechanism, a hydraulic mechanism, an electrical control mechanism, and a support mechanism. Hydraulic oil is pressurized by a vane pump, passing through a filter, explosion-proof electromagnetic directional valve, throttle valve, hydraulic check valve, and balance valve into the lower end of the hydraulic cylinder, causing the hydraulic cylinder piston to move upward to lift the load. The oil returning from the upper end of the hydraulic cylinder flows back to the tank through the explosion-proof electromagnetic directional valve, and its rated pressure is adjusted by the overflow valve.
Those familiar with hydraulic lifts know that once they are put into use, they can meet basic functional requirements. However, from field use, phenomena such as package slippage, difficulty in detecting the rising position, inability to find the intermediate position, impact noise during ascent, and hydraulic cylinder oil leakage often occur. Field inspections revealed that the lifting speed of the lifting hydraulic cylinder is too fast, leading to increased failure rates and severely affecting production efficiency. Lifting hydraulic cylinder lifting speed Analysis of the causes of instability of the lifting hydraulic cylinder lifting speed There are many reasons for instability, including design, manufacturing, and usage.
For hydraulic lift failures, we use speed Rigidity theory analyzed the lifting hydraulic cylinder lifting speed Reasons for instability: (1) Composition of the lifting hydraulic circuit : Oil pump overflow valve, directional valve, directional valve, one-way throttle valve (without throttle), lifting oil cylinder. (2) Establishing the lifting circuit speed Stiffness analysis formula. The flow rate entering the hydraulic cylinder, that is, the flow rate through the one-way throttle valve, is the flow rate through the throttle valve; the throttling shape of the throttle valve and the viscosity of the hydraulic oil, etc. The inlet is the flow area of the throttle valve; the outlet pressure of the hydraulic pump; P1 is the pressure of the hydraulic cylinder oil inlet chamber and the area of the lifting hydraulic cylinder plunger; the index determined by the throttle shape, the formula for the speed control circuit can be obtained. speed When the throttling area remains unchanged, the output of the hydraulic cylinder speed will change with the load. Load changes affect speed The degree of influence is expressed by the speed stiffness T This is because with the increase of the load, the output of the hydraulic cylinder of the elevator executive mechanism speed Negative descent; in order to make the progress positive, a minus sign must be added to the formula. Substituting into the hydraulic elevator, the speed The greater the stiffness, the speed The better the stability of the hydraulic circuit.
Based on the analysis, the following conclusions can be easily drawn: 1. When the load is constant, the smaller the throttle inlet, the speed The higher the stiffness of the system; conversely, if the opening area of the throttle valve is large, the intake will be lower. 2 2. When the load is constant, at low speed speed Good stiffness, when the load changes, when the load is small speed Good stiffness. 3 3. Increasing the oil supply pressure and the effective area of the hydraulic cylinder can improve speed Stiffness. In summary, many equipment failures are related to hydraulics, and the main cause of hydraulic lift failures is the unreasonable design of the speed control circuit of the hydraulic system, which deserves attention from relevant enterprises.
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BLOGS
Liu Tiesheng was re-elected as a member of the Jiyang County CPPCC for five consecutive terms and served two terms as a standing committee member. He is the former chairman of Shandong Jiyang Machinery Factory Co., Ltd. During the transition from a planned economy to a market economy, he demonstrated exceptional foresight and courage, leading the way in technological innovation and contributing to the prosperity of Shandong Province and the nation. His achievements made the company a shining success. He is considered a prominent figure in Jiyang County's 30 years of reform and opening up, a pioneer in the development of the Jiyang lifting platform industry, and a well-deserved leader in the machinery industry!
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