Full-hydraulic drive gear box for petroleum drilling machine

In the prior art, oil-well rig is established three hydrodynamic units i.e. two torque-converters [1,2], a coupler [3] and a friction clutch [4] with many circulations garden hydraulic transmission gearbox (patent No. is the .X driving device for drilling rig) as shown in Figure 1 in the gearbox.Its two torque-converters are that low speed segment torque-converters [2] and high regime torque-converters [1] are used for speed governing, bending moment.High speed when coupler is used for sky elevator or idling lotus rises.Its reverse gear operating mode is finished by friction clutch.In use the friction plate of friction clutch very easily damages, and functional reliability is poor, and simultaneously output terminal must remain static during reverse gear, and is not suitable for transmitting bigger power.

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Oil-well rig of the present utility model with full hydraulic transmission gearbox owing to all adopted hydrodynamic unit at whole ahead condition and reverse gear operating mode.Compared with the prior art, except that advantage with many circulations garden hydraulic transmission box, owing to adopt fluid torque converter to replace friction clutch, its reverse gear change working is filled oil extraction by torque-converters and is realized, therefore conversion steadily, output terminal need not be in full state of rest when having impact, no frictional loss, reverse gear conversion, thereby easy to operate, reliable operation, greatly reduce maintenance expenses and improve working life, more present various rigs have more practicability, reliability and durability with hydraulic transmission gearbox.

The full hydraulic transmission gearbox of oil-well rig of the present utility model, it is made up of casing, four hydrodynamic units and gear, bearing, oil pump, its four hydrodynamic units are bottom gear torque-converters, mid ranger torque-converters, top gear coupler and reverse gear torque-converters, connect by gear between each hydrodynamic unit.

The purpose of the present utility model is to invent a kind of full hydraulic transmission gearbox, it utilize the hydrodynamic unit characteristic soft, operate steadily, impact load is little, carry-over moment is big, reliable operation, regulate and control characteristics easily, except that ahead condition with the hydrodynamic unit, other adopts a fluid torque converter to replace former fluid power transmission case reverse gear operating mode friction clutch, reach the poor reliability that overcomes it and in utilization, exist, the shortcoming of gear shift regulation and control inconvenience, guarantee that rig is safe and reliable.

Oil-well rig of the present utility model with an embodiment of full hydraulic transmission gearbox as shown in Figure 2.It is made up of casing [5], four hydrodynamic units [6,14,17,24], oil pump [20,22], gear [7,8,10,11,12,13,15,16,18,19,23,25] and bearing.Four hydrodynamic units are respectively bottom gear torque-converters [6], mid ranger torque-converters [24], top gear coupler [17] and reverse gear torque-converters [14], connect by gear [7,8,10,11,12,13,15,16,18,19,23,25] between four hydrodynamic units.

The fluid torque converter of bottom gear [6] places on the root system altogether with the fluid torque converter [24] of mid ranger, and connecting together of the pump impeller rigidity in pump impeller in the torque-converters [6] and the torque-converters [24] meshed with gear [16] order on gear [25] and the input shaft [21].Connecting together of turbine rigidity in turbine in the torque-converters [6] and the torque-converters [24] penetrates the hollow shaft of above-mentioned pump impeller, is meshed with the gear [8] of output shaft [9] by the gear [7] that is contained on the turbine shaft.

The fluid coupling of top gear [17] places another root axle altogether with reverse gear fluid torque converter [14], being connected on the hollow shaft of pump impeller rigidity in pump impeller in the top gear coupler [17] and the reverse gear torque-converters [14], the gear on it [15] is meshed with gear [16] on the input shaft [21].Being connected on the axle of turbine rigidity in turbine in the coupler [17] and the torque-converters [14], and penetrate on the said pump wheel hollow shaft, pass on output shaft [9] by gear [8,10].

Each is that gear etc. is installed in the same casing [5] by spring bearing.When gearbox is worked at bottom gear, be power to be reached power input shaft [21] by prime mover, by gear [16] and [25], power is reached the Pump wheel shaft of bottom gear torque-converters [6], this moment, working oil fed in torque-converters [6] active chamber (other three hydrodynamic units are not oil-filled), drive turbine rotation, by gear [7], [8], power is exported from output shaft [9].In like manner, if working oil charges into mid ranger torque-converters [24] active chamber, or top gear coupler [17] active chamber (other three hydrodynamic units are not oil-filled), can realize the work of middle and high speed shelves.Reverse gear torque-converters [14] active chamber is oil-filled during the reverse gear operating mode, all emptyings of all the other elements.Reverse gear torque-converters [14] turbine of reverse gear work oppositely reaches output shaft [9] by gear [12,13] and [11] and [8] with rotating speed, realizes reverse gear work.This complete fast conversion of each grade of hydraulic transmission gearbox flows to by Control work oil and realizes.Meanwhile power input shaft [21] drives oil pump [20,22] work and fills oil extraction by control and oil-way system to the hydrodynamic unit of work by gear [18,19,23].

Full hydraulic transmission gearbox can be according to the oil-well rig job requirement, the parameter of each hydrodynamic unit of rational Match, guarantee complete machine coordination control, improve the complete machine working efficiency to greatest extent, help improving the Economy of rig operation, energy-saving and cost-reducing, have buffering, vibration damping, work characteristics stably, greatly reduce the impulsive load of frictional loss and component, reduce maintenance expenses, improve rig working life and functional reliability.Adjust easy to operately simultaneously, improve staff's operating conditions, have good society, economic benefit.

Where do encoders face their toughest operating conditions? One answer at the top of the list is in the petroleum industry, where encoders are used everywhere.

In this post we&#;ll look at encoders in the oil industry, from beginning to end&#;the rough conditions encoders face on oil drilling rigs, how they keep oil flowing in transport pipelines, and the way they ensure accuracy at gasoline pumps.

ENCODERS PERFORM ON OIL RIGS

Massive drilling systems called oil rigs begin the process of extracting oil from underground reservoirs. Sections of drill pipe are linked together with weights and a bit at the end to form the drill string. The bit bores a hole through earth and rock, sometimes to a depth of thousands of feet.

Cable from the drawworks (located on or near the main platform) runs up to the crown block at the top of the derrick, then down to the traveling block. The top drive rotates the drill string; it is suspended from the traveling block, and is raised or lowered by the drawworks.

Encoders can be used to help control two critical motions in drilling: rotational speed control while turning the drill string using a top drive or turntable; and vertical position control when using a powerful winch called a drawworks to raise or lower the drill string and top drive. In either case, the working conditions can be horrendous, with vibration, impact, temperature extremes and even explosive fumes being some of the challenges faced.

Top Drive - To cut into rock, the drill string and bit are driven at precise speeds by a top drive, which in modern rigs has replaced older turntable drives. The top drive consists of a motor and gears that rotate the drill string. Precise speed control is critical. Too slow, and drilling time and equipment usage is wasted. Too fast, and the bit or drill pipe can break.

An encoder can be used on the motor or gearbox to monitor rotation speed. The encoder provides feedback so that speed can be precisely controlled to keep torque at optimum levels.

Drawworks - The top drive, drill pipe and bit move up and down via a traveling block and tackle, which is raised and lowered by the drawworks. The combined weight of the load can be hundreds of thousands of pounds.

Position control is crucial. How much pipe has gone down the hole? How deep is the well? Encoders can be used on the drawworks to monitor motor or gear rotation. This helps keep track of the traveling block&#;s position, and thus the depth of the drilling equipment. Knowing the precise position helps rig operators track whether or not they are on schedule, know what type of rock they&#;re drilling through, and identify when to change drill bits, for example.

Additional reading:
Unlocking the Power of Gears for Petroleum Drilling: Your Top Questions Answered

Are you interested in learning more about Gears for Petroleum Drilling Machinery? Contact us today to secure an expert consultation!

You can see a top drive and drawworks go through their moves in this short video.

Drilling operations usually continue 24 hours a day. The harsh conditions place special demands on equipment, including encoders used on top drives and drawworks.

Surviving Harsh&#;and Dangerous&#;Conditions - Encoders on oil rigs have extra demands placed on them, even when compared to the most challenging industrial settings. They must operate in harsh conditions while withstanding constant vibration, impact, excessive moisture, dirt, electrical noise, corrosive salt atmosphere, and temperature extremes from deserts to the arctic. And if that&#;s not enough, they face potentially explosive fumes&#;even under normal conditions&#;and must function without causing explosions.

To meet these demands, reliability is key. Manufacturers have developed encoders that can communicate over long distances without signal degradation. Sometimes multiple encoders are stacked up on the same motion axis for redundancy, and also to send signals to different parts of the operation. Some encoders are designed to be certified explosion proof or flameproof, to meet regulatory requirements around the world.

ENCODERS HELP CONTROL FLOW IN TRANSPORT PIPELINES

Once the crude oil has been pumped from the ground, the next challenge is to transport it to a tanker ship or refinery. Pipelines accomplish this task.

Encoders can help here, too. Oil is forced through pipelines at pumping stations, where pumps are driven by motors. Encoders attached to the motors can send feedback to the control system, which uses the encoder signals to maintain precise speed control of the motor and pump.

Encoders help provide constant flow velocity, which is critical. To see why, consider the momentum of oil when it flows through a pipeline.

The Trans Alaska Pipeline System in winter. Encoders can help pipeline pumps maintain constant flow velocities, which is critical for avoiding pressure surges.

The Trans Alaska Pipeline System, for instance, built in the s, transports oil more than 800 miles across the state of Alaska. The journey takes about 16 days at a velocity of 2 miles per hour in the pipeline. Here are some throughput flow rates from March, (as per FACTS: Trans Alaska Pipeline System):

544,445 barrels/day = 15,880 gallons/minute = 265 gallons/second

Crude oil weighs about 7.2 pounds per gallon, which means that even at the leisurely pace of 2 miles per hour, more than 1,900 pounds of oil flow by every second. That&#;s more than 6 barrels per second! If the velocity of the moving flow changes too rapidly, a pressure surge can result and quickly propagate through the pipeline. With encoder feedback used for speed control, pumps can maintain a constant flow, which helps avoid pressure surges and spikes, noise and vibration.

Other pipelines may differ in travel time or flow rates, but no matter what the numbers, encoders can help petroleum products get to their destination smoothly and safely.

ENCODERS DELIVER ACCURACY IN GASOLINE PUMPS AND FUEL DISPENSERS

A large fraction of crude oil pumped from wells is converted to gasoline at refineries. The gasoline is delivered via distribution pipelines and trucks to gas stations, where it&#;s stored in underground tanks that can hold thousands of gallons. As the gas flows into a customer&#;s tank, an encoder helps to accurately measure the quantity delivered.

At the heart of a modern fuel dispenser is an encoder connected to the flow meter.

&#;Gas Pump&#; vs. &#;Fuel Dispenser&#; - Before we explain how an encoder performs the trick of measuring a fast-moving flammable liquid, let&#;s clarify our terms. A gas pump is a self-contained unit that has a pump, a motor to drive the pump, and a flow meter; it draws fuel from the underground tank via a suction line. A fuel dispenser does not have its own pump; instead, a submersible pump is located in the underground tank, which can deliver gas to several dispensers, each with their own flow meter. Most modern gas stations use fuel dispensers, not self-contained gas pumps.

The flow meter is the heart of the dispenser. A variety of technologies are used to measure flow, and in each of them the flowing liquid causes movement in the meter&#;s mechanism. In prior decades, the meter&#;s movement was connected directly to a series of linked wheels with numbers on them, which rotated like an odometer to measure gasoline flow.

In older gas pumps, the flow meter&#;s mechanism connected directly to linked wheels which displayed volume and price. In modern pumps, the meter can be connected to an encoder, and the linked wheels are no longer necessary.

In modern dispensers, the meter&#;s rotational movement can be connected to a rotary encoder. The encoder transmits signals to a computer, which makes possible all the innovations we&#;ve come to expect at gas stations: digital displays showing volume and price, pay-at-the-pump by credit card, remote monitoring by staff, and much more. Using an encoder also simplifies the filling process&#;no need to reset the rotating wheels&#;which makes it easier for customers to pump their own gas.

Encoders are used everywhere in the petroleum industry: they&#;re at the beginning when oil is still underground, in the middle when encoders ensure reliable transport, and at the end when they accurately measure gasoline flowing into a customer&#;s fuel tank.

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