The orbital motor has a wide range, in the process of use may encounter a variety of problems, lower stable speed is an important technical indicator of the hydraulic motor, its performance, such as whether or not it directly affects the working performance and life of the equipment, this article will introduce you to the impact of orbital motor speed of the major factors.
1. Starting torque and load matching mechanism
In heavy load starting scenarios, the starting torque characteristics of the hydraulic motor are critical. Experimental data show that the starting torque of orbital motor is usually 70%-85% of the rated torque, if you ignore the parameter matching, it will lead to equipment “holding pressure” can not run. A harbor crane accident showed that the failure to check the starting torque led to instantaneous overloading of the motor tooth surface, resulting in the collapse of the top of the rotor teeth. It is recommended to establish the load-torque curve through the torque tester, and set the hydraulic system pressure compensation valve to ensure that the peak starting pressure does not exceed 120% of the rated value of the motor.
2. Back pressure management and leakage control
The back pressure of hydraulic motor should be strictly controlled within the range of 0.3-0.5MPa, and exceeding 0.8MPa will lead to abnormal wear of the sealing belt of the distributor. In the actual project, the proportion of motor burning cases caused by the mixing of oil drain pipe and oil return pipe reaches 18%. It is recommended to adopt independent oil drain piping design, and install back pressure valve and pressure sensor in oil return pipe to realize real-time monitoring. The case of a tunnel boring machine shows that after adding a back pressure compensation circuit, the life of the motor bearing is extended by 40%.
3. Redundant design of braking system
Due to the inherent leakage of hydraulic motors (usually 0.5-2mL/min), reliable braking cannot be realized by simply blocking the import and export. In a wind power yaw system accident, brake failure caused the nacelle to over-turn 30°, resulting in gearbox damage. It is recommended to adopt the dual safeguard program of hydraulic brake + mechanical locking, and set up accumulators in the braking circuit to ensure that the braking pressure can still be maintained for more than 5 minutes when the power is cut off.
4. Inertial load buffer technology
When driving inertia load (rotational inertia>0.5kg-m²) or performing high-frequency start-stop operation, it is necessary to set buffer valve group in the return oil circuit. A die-casting machine clamping mechanism test shows that the hydraulic shock pressure can be up to 2.8 times of the system pressure when no buffer valve is installed, far exceeding the component pressure limit. Recommend the use of two buffer valve structure: a throttle to consume 80% of the impact energy, two check valves to prevent backflow of oil, measured impact pressure can be controlled in 1.5 times the safety range.
5. Configuration of speed limit protection device
In cranes, crawler vehicles and other application scenarios, speed limit valves must be set to prevent speeding accidents. In the case of a mining dump truck out of control downhill, the uninstalled speed limit valve leads to speed loss up to 35km/h. It is recommended to adopt the composite speed limit program of two-way hydraulic lock + proportional throttle valve, which can stably control the speed within 5km/h under a 20°slope, and at the same time, it is equipped with a speed sensor to realize the closed-loop control.
6. Starting smoothness optimization strategy
The quantitative motor system can realize smooth starting and stopping through pressure-flow composite control. A concrete pump application case shows that after adopting electro-hydraulic proportional valve + acceleration feedback control, the start-up shock is reduced by 75%, and the amount of stopping skidding is reduced from 30mm to less than 5mm. It is recommended to configure the controller with ramp function, set the start-stop transition time of 0.5-2 seconds, and add the pressure mutation detection module.
Through systematic optimization of design, orbital motor speed fluctuation rate can be controlled within ±3%, significantly improving equipment reliability. This article on Orbital motor applications for part of the introduction, if you want to know more information, or want to buy related products, welcome to our official website.
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