Steam Turbine Electric Overhaul Turning Device (Top Mount Type)
The QJPC-S/X type steam turbine electric overhaul cranking device is a special overhaul equipment used in the overhaul of steam turbines in large thermal power plants. When the power plant shuts down the steam turbine unit for maintenance, the use of this equipment can greatly improve the quality of maintenance, shorten the maintenance period, reduce labor intensity, completely abolish the traditional method of pulling the steam turbine rotor with a wire rope, and greatly improve the safety of the maintenance work Sex. Power plants use this equipment to overhaul steam turbine units. It reflects civilized overhaul, safe overhaul, and efficient overhaul. It can bring very intuitive and very good economic benefits to power plants.
Өзгөчөлүктөрү
Top-loading inspection and repairing crank (QJPC-S)
(1) The design of QJPC-S top-mounted overhaul barring is simple and beautiful. The small gear meshes with the large gear on the upper part of the cylinder. The rotor can be rotated continuously or by jog.
(2) It is easy to install, and the equipment is fixed at the position of the original work turning device. Adjusting the mobile box can make the small gear in the mobile box and the big gear on the steam turbine rotor mesh or separate easily, so that the steam turbine rotor can be hoisted into the cylinder freely.
(3) After the rotor of the steam turbine rotates in place, the button of the control box can be reversed to release the force, so that the rotor of the steam turbine is easily in a free state. Ensure that the measurement data is true and accurate.
(4) The portable electric control box is small, light, flexible, and has a large moving range.
Bottom-loading inspection and repairing crank (QJPC-X)
(1) The QJPC-X bottom-mounted overhaul barge is designed to be stable and generous. The small gear of the barring gear meshes with the large gear at the lower part of the cylinder. The rotor can be rotated continuously or by jog.
(2) The equipment is fixed at the position of the original work turning device. After being installed and fixed in place at one time, it can complete all the work of steam turbine maintenance and measurement without adjustment. And the steam turbine rotor is hoisted out and into the cylinder without any obstruction.
(3) After the rotor of the steam turbine rotates in place, the button of the control box can be reversed to release the force, so that the rotor of the steam turbine is easily in a free state. Ensure that the measurement data is true and accurate.
(4) The portable electric control box is small, light, flexible, and has a large moving range.
техникалык параметр
Serial number Product model Applicable unit Main technical parameters Remarks
Operating voltage Input speed Output speed Rotor speed
1 QJPC-20S Below 200MW 380V 130-200 4-132 Y315M-4/132 2400×2310×2550
2 QJPC-30S/X 300MW~500MW 380V 180-320 4-160 Y315L1-4/160 2700×2570×2800
3 QJPC-60S/X 500MW~600MW 380V 240-400 4-200 Y315L2-4/200 2700×2870×2800
4 QJPC-100S/X 650MW~1000MW 380V 240-450 4-200 Y315L2-4/200 3000×2700×3070
HYPC series steam turbine electric overhaul turning gear is a special overhaul equipment used in steam turbine overhaul work in thermal power plants. When the power plant shuts down and overhauls the steam turbine unit, it needs to rotate the rotor for a series of overhaul work. The use of this equipment can improve the quality of overhaul and shorten The maintenance period reduces the labor intensity of workers, and completely abolishes the traditional methods of pulling the steam turbine rotor with steel wire rope and prying the steam turbine rotor with a crowbar, which greatly improves the safety in the maintenance work.
The use of this equipment to overhaul steam turbine units reflects safety overhaul, civilized overhaul, and speed overhaul.
The gear meshing position of the HYPC-S type top-mounted electric overhauling crank is on the upper part of the cylinder center.
Негизги өзгөчөлүк:
1. Reasonable design and long service life.
2. Easy to install, the equipment is fixed at the position of the original work turning device.
3. The operation is simple, and the adjustable movable box body can ensure that the small gear in the box body and the large gear on the steam turbine rotor are conveniently in meshing or separated state, and the steam turbine rotor can be hoisted into the cylinder freely.
4. The output speed is low (2 rpm), the output torque is large, the rotation is stable, the noise is low, the stopping point of the rotating steam turbine rotor is accurate, and there is no idling phenomenon.
5. It can be forward and reverse continuous cranking and forward and reverse jog cranking. The special combined sub-gear design can make the steam turbine rotor rotate in place, which is convenient and quick to release the force, which can make the steam turbine rotor in a free state and ensure the measurement The data is accurate, true and reliable.
6. The portable electric control box is small, light, flexible, and has a large moving range.
негизги техникалык параметрлери:
1. Working voltage: ~380V 2. Reducer power: 5.5kw
3. Output speed: 2r/min 4. Rotor speed: 0.45～0.5r/min
5. Travel of the mobile box body: 105 mm～120 mm 6. Travel of the clutch: 25 mm
HYPC-X series steam turbine electric overhaul turning gear is a special overhaul equipment used in steam turbine overhaul work in thermal power plants. When the power plant shuts down and overhauls the steam turbine unit, it needs to turn the rotor for a series of overhaul work, such as rotor centering, back wheel The use of this equipment can improve the quality of maintenance, shorten the maintenance period, reduce the labor intensity of workers, and completely abolish the traditional methods of pulling the steam turbine rotor with steel wire rope and prying the steam turbine rotor with a crowbar. Improve the safety in maintenance work.
The use of this equipment to overhaul steam turbine units reflects safety overhaul, civilized overhaul, and speed overhaul.
Өзгөчөлүктөрү:
1. Advanced design and long service life.
2. The installation is convenient and simple. The steam turbine electric overhaul crank (below-mounted) is installed at the position of the original work crank, and the bolt hole position of the original work crank is directly used. The meshing position of the pinion gear and the large gear of the working crank is at the lower part of the cylinder.
3. After the electric overhauling crank is installed and adjusted in place, all the work of the steam turbine inspection can be completed without disassembly and removal, and the steam turbine rotor is hoisted out and hoisted into the cylinder without any obstruction.
4. Pull the clutch handle on the moving box to smoothly turn the steam turbine rotor when the gears are engaged. When the meshing gears are separated, the passive gear can rotate freely, ensuring that the large gear on the steam turbine rotor can rotate with the small gear when entering the cylinder. Import the mesh.
5. After the steam turbine rotor is turned in place, the control box button can be reversely moved to release the force. The steam turbine rotor is easily in a free state, ensuring accurate and true measurement data. Because the large and small gears mesh in the lower part of the cylinder, the upper part of the large gear of the steam turbine working crank is completely exposed, which makes it easier for maintenance personnel to observe the data and facilitate work.
6. The bottom-mounted overhauling cranking device can also be installed and used when the upper cover of the steam turbine working crank bearing is not opened.
7. It can be used for accident cranking after shutdown when the main engine opens the jacking shaft oil.
8. The output speed is 2 revolutions per minute, the output torque is large, the rotation is stable, the noise is low, the stopping point of the rotating steam turbine rotor is accurate, and there is no idling phenomenon. It can be used for forward and reverse continuous cranking and forward and reverse jog cranking. (With jack oil, it can be cranked continuously for a long time; without jack oil, the continuous crank cannot exceed 3 minutes) to ensure that the measurement data is accurate, true and reliable.
9. Equipped with a special craft box to ensure the stable installation of the equipment and protect the equipment.
10. The electric control box is small and light, flexible in operation and large in moving range.
First, the purpose of the turning device
The turning gear of the steam turbine is an important rotating equipment to ensure that the steam turbine rotor is evenly heated and cooled when the steam turbine unit starts and stops. The cranking not only enables the unit to be started at any time, but also can be used to check whether the steam turbine unit has normal working conditions, such as whether there is friction between the moving and static parts, whether the main shaft curvature is too large, and whether the lubricating oil system works normally.
Second, the characteristics of the turning device, turning device, manual turning, electric turning, hydraulic turning device, steam turbine starting turning device, electric turning turning device.
1. The steam turbine cranking device of the cranking device can realize automatic commissioning and program start. The cranking speed is 3.5-4 rpm, the motor power is 7.5kw, and it is equipped with a cranking control box, with automatic commissioning, manual commissioning and point. Three functions.
2. There is no sticky substance jam in the operation, and the operation can be effective and automatic for a long time, and there is absolutely no oil leakage.
3. No mechanical damage caused by tooth tip collision.
4. The electromagnetic clutch can be automatically disengaged in place with ease.
Third, the structure of the turning device
The turning gear of a steam turbine is mainly composed of a worm gear, a worm gear (transmission ratio i=27.5) and an electromagnetic clutch. The combination of a geared motor and an electromagnetic clutch is used to replace the oil cylinder. The working torque is the same, and the action of the connecting rod system is transmitted through a belt drive. It is indeed ideal whether the factory test or the power plant is put into operation. The clutch includes sliding parts, pawls, helical internal gears, external gears and buffers. The inner side of the sliding member is provided with ratchet teeth and internal gears (straight teeth), and the outer side is a spiral external gear. The electric drive part of the steam turbine cranking car adopts mechanical transmission. Its driving motor (37kw, 380v, 1475rpm) passes through a fluid coupling, and the intermediate connecting shaft drives the steam turbine cranking car to rotate the unit shaft at a high speed of 54rpm.
There are usually two types of cranking speed: low-speed cranking at 2~4rpm and high-speed cranking at 40~70rpm: For large-capacity units, in order to form bearing oil film, avoid bearing and journal wear; and reduce the temperature difference and shortening of the upper and lower cylinders Most of the starting time is high-speed cranking.
Fourth, the working principle of the turning device
When the turning gear is working, the motor drives the gear ring on the steam turbine rotor to rotate through the worm, worm rim, and driving gear, thereby driving the steam turbine generator rotor to rotate.
When the steam turbine rotor is at rest, the sliding member is at the right dead center position of the cranking, and the pawl extends and abuts the ratchet tooth. When the worm and worm wheel rotate, the worm wheel drives the helical gear (internal teeth) to rotate together. At this time, due to the inertia of the ratchet and the rotor due to the pawls (4 in total), the sliding parts cannot follow the helical gear (internal teeth) Rotate together, but can only move in the axial direction (toward the nose). Then, the internal gear (straight tooth) on the sliding member meshes with the external gear fixed on the outer extension shaft of the steam turbine rotor, the pawl and the ratchet are disengaged, and the worm gear drives the external gear through the helical gear and the sliding member to rotate the rotor until it reaches The rated speed of the steam turbine cranking. When the sliding piece moves to the left to the top, the oil slowly drains from the buffer to prevent the sliding piece and the end from being rubbed.
When the steam turbine rotates, the speed of the steam turbine is higher than the speed of the cranking. The reverse torque generated by this speed difference pushes the sliding part to move slowly to the right in the axial direction. The internal gear on the sliding part is separated from the external gear, and the pawl Re-located in the ratchet, since the difference between the cranking speed and the steam turbine speed is gradually increasing, the sliding member moves smoothly to the right. When the speed of the steam turbine is greater than 140 rpm, the pawl will retract and disengage the ratchet tooth under the action of the unbalanced centrifugal force at both ends of the pawl, and the crank will automatically withdraw.
Once the steam turbine generator set is disconnected, the motor of the electric crank is immediately put into operation. When the speed of the steam turbine rotor drops to 140 rpm, the ratchet part of the pawl re-extends to resist the ratchet teeth. When the speed of the steam turbine drops to 54 rpm, which is the same as the speed of the barring, the sliding part moves to the left to the working position, and the inner and outer gears mesh smoothly.
Fifth, order instructions
1. The barring device can be divided into three types: manual barring, electric barring and water conservancy barring device. The manual barring device is only used for small steam turbines. The electric barring device is widely used in large and medium-sized steam turbines. The hydraulic barring device only Used for high-power steam turbines.
2. Power plant cranking includes steam turbine commissioning cranking, circulating water pump maintenance cranking, and coal mill service cranking.
3. Provide steam turbine model and date of manufacture.
