Выбор промышленной планетарной коробки передач сверх максимального крутящего момента

The maximum torque value can cause an industrial planetary gearbox to appear to be a good option prior to knowing operating conditions. The "how hard" questions come later: will it withstand repeated reversals, provide the needed speed (и крутящий момент) under the hydraulic supply available, and hold the machine when driving torque is lost?

Those events should be the first to consider when making selection by heavy-equipment engineers and project buyers. Here the product described is a Mingye GMR planetary drive, and demonstrates how a challenging application can be transformed into one that is "configurable" for review prior to order.

Before deciding on the product you need to choose, define your industrial duty.

Planetary gearing is a means of transmitting load over multiple planet gears that are in between a sun gear and a ring gear. This set up is compact for torque transmission, однако, it isn't for every planetary product to be used on the same machine.

The range of Mingye's planetary gear reducer lies in between precision products and heavy-duty drives. The precision reducer PAB takes care of the motion-control integration, and the GMR precision reducer is introduced to connect with hydraulic motors in heavy rotary applications. The low-backlash specification is not a substitute for a heavy duty load assessment, nor is a high torque specification a guarantee that the precision positioning will be good.

Identify what is being moved by the gearbox, where the reaction torque is being applied, and the operation of the machine during start, normal working, reverse and stop. These descriptions are more helpful than just asking for an industrial gearbox according to its motor power.

Create a Load History, NOT One Torque Number

Identify continuous torque requirements, short duration torque peaks and stationary holding torque requirements. A crawler turning around on a hostile terrain, a drill when it hits something, and a winch when it is pulling up a loaded drum present different demands but may have the same average demands.

For every event, state the torque, length of time, Частота, direction and speed required for the event. Where appropriate, state how the measurement or calculation was arrived at, rather than simply cover up the uncertainty within a generous motor rating.

If a published maximum torque is not automatically taken as an allowable continuous rating, then it must be derated to a suitable continuous rating. Query the supplier to establish the operating limits, overload allowances and rating method. Multiple peaks have different impacts on gears, Сплайны, bearings and couplings as compared to a constant load and, следовательно, the entire history is relevant when choosing a configuration.

Connect Gearbox Ratio to the Hydraulic Supply:

With a hydraulic drive start with the desired output speed and reverse engineer up through the reduction ratio. Next check to see if the input speed the motor reaches is available with the flow available. The actual result depends on the motor displacement, the volumetric efficiency and supply conditions.

The pressure difference across the motor, displacement and mechanical efficiency must be checked separately for torque. Pump pressure is not the complete description of the torque available at the motor shaft, especially when there is a large amount of line losses and return pressure.

The output torque of the gearbox is very close to the input torque times ratio times gearbox efficiency, when referring to motoring. This relationship is an estimation of the demand and capability and is not a mechanical or thermal limitation of the reducer. Variable-displacement motors: examine the combinations of torque and speed over the range of displacement, instead of approving just one operating point.assets.

The GMR Data can be read as a Specific Configuration.

One of the pages from Mingye's GMR Series Planetary Slewing Drive page shows a 2-stage planetary slewing drive, with an output torque of 9,000 Nm, the maximum input speed of 1,000 обороты, and a 33.6 ratio. The same row specifies a GRS-250 hydraulic motor and the corresponding brake data.

These are the figures for the published configuration and not all industrial planetary gearboxes. Based on the nominal ratio, the output speed at 1,000 rpm would be about 29.8 rpm. That speed is a calculation that doesn't guarantee that you can have both max speed and max torque at the same time or all the time.

Check with Mingye to verify the operating envelope of the proposed assembly. Explain motor inclusion, brake options, interface dimensions and documentation. A product table is intended to serve as a starting point for engineering review and not as an entire product approval of the machine duty.

Assess the Output Support with respect to the Gears

A gearbox may require the ability to provide the torque, but it has an output support which is not suitable for the mechanism it is attached to. Sprockets, пиньоны, drums add forces which are not only based on the nominal torque, but on the geometry and location of these parts.

Минье Руководство по размеру редуктора лебёдки relates Drum Diameter, Line pull, Speed and Motor matching. By changing the effective winding radius the torque required to achieve the same line pull is changed for a drum. The amount of drum loading which reaches the gearbox bearings is dependent upon the support arrangement.

Other mechanisms: specify radial and axial forces, load offsets and overturning moment. Specify if there is independent bearings on the driven assembly. Instead of assuming that the planetary structure is able to handle all of the external forces, request allowable combined loads for the actual mounting arrangement.

Separate Holding Braking and Recovery Functions, the ultimate in safety.

A holding requirement is not a "stopping requirement" for a moving machine. Specify the conditions during commanded stop, loss of driving pressure and any anticipated back-driving condition. For such cases, the brake and hydraulic controls need to be considered in conjunction with each other.

Mingye talks about an optional hydraulically released brake for gMR configurations that is applied when spring is applied. Specify the number of points to be held, the conditions for releasing, if the dogs will engage and if dynamic stopping is allowed. The brake torque too requires a quoted shaft of reference for comparison against the torque of the output load.

Mechanical disengagement is provided for some GMR configurations for recovery. Disengagement will alter the restraint path, ask for the specific process and the independent restraint needed. Should not be interpreted as the general guideline of towing any attached machine or releasing a loaded mechanism.

Please verify Installed Duty before Order Release

Окружающие условия, Часы работы, Перевороты, contamination exposure and access restrictions. Ensure that the unit supplied is compatible with the mounting lubrication requirements, sealing requirements and service access. The mechanical load capacity does not determine acceptable temperatures for prolonged work.

The capability of Mingye is displayed on their website in terms of machining and dimensional inspection. Identify manufacturing controls and inspection records that apply to the proposed GMR assembly, but don't carry over hardness or accuracy requirements from another product family. Finalize any running or load testing and make note of the conditions prior to production.

Maintain a copy of the approved drawing, configuration code, information on the hydraulic motor, brake specification, installation instructions, и т. д.. in a single place. A subsequent drum change or other changed supply or working cycle should be a reason for a subsequent review.

The operating envelope of an industrial planetary gearbox is the key indicator of the suitability of the gearbox. The best buy action links load history, hydraulics, power assistance and stopping characteristics to one verified build.

Часто задаваемые вопросы

Q1. Is it possible to use the maximum output torque as continuous rating?

Not without confirmation. Request values of both continuous and peak duty, duration of duty and the duty to rating conditions of the chosen configuration.

Q2. Is there always an electric motor in a planetary gearbox?

Нет. Mingye's GMR product can be integrated with the hydraulic motor. Make sure all of the motor and connection components are specified by the quotation.

Вопрос 3. Is it possible to base hydraulic drive performance upon pressure alone?

Нет. Motor pressure difference and displacement have an impact on torque, flow and displacement have an impact on speed. Discuss efficiency and conditions in the circuit.

Q4. If a brake is integrated, does that mean that it can be used for emergency stopping?

Нет, holding and stopping are two different things. Test the brake for the correct operation and synchronization with the hydraulic controls.

Q5. What should be included on the letter of initial enquiry?

Include load events, speeds required, hydraulic supply and interface drawings. Внешние нагрузки, braking requirements, environment and operating hours.