A steam turbine turning automatic cycle commissioning test equipment

Abstract

The invention discloses a turbine cranking automatic cycle commissioning test equipment, which is characterized by comprising a test bench, a cranking test control module and a hydraulic oil station module. The invention makes an innovative design to a traditional cranking test platform, and realizes automatic cycle engagement and disengagement between the commissioning cranking gear and a simulated rotor of a turbine through a PLC control module; the inertia and rotation speed of a turbine rotor are simulated through the coordinated use of a hydraulic motor, a hydraulic oil station and an electromagnetic clutch; the invention utilizes low-cost and small parts to realize the simulation of heavy parts through the innovative design of traditional processes and the invention of an existing cranking test bench, thereby reducing the production cost of the enterprise, enhancing the functional reliability of the product after leaving the factory, improving efficiency, controlling product quality and reducing labor and production costs, and can provide real-time production data for workshop production, thereby enhancing the enterprise's scientific and technological innovation and management capabilities.

Description

Technical Field

[0001] The invention relates to a steam turbine cranking automatic cycle commissioning test equipment, which is used for early simulation test of whether the steam turbine cranking gear can smoothly achieve commissioning meshing and be smoothly launched with the steam turbine rotor after leaving the factory, and belongs to the technical field of steam turbine equipment detection. Background Art

[0002] The turbine turning device is an important equipment of the turbine body. The operation quality of the turning device affects the safe start and shutdown operation of the turbine. The turning device is mainly used before the start and after the shutdown of the turbine rotor to prevent the turbine rotor from bending and deforming due to uneven heating and continuously turning the motor.

[0003] Before the turbine rotor is started up and when the turbine is slowed down to stop, the turning device should be put into use in time to keep the hot and cold rotors in continuous turning at the turning speed to avoid bending of the rotor due to uneven heating. The turning should be continued until the cylinder temperature drops to a certain temperature and the rotor does not produce hot bending or deformation, then the turning device can be stopped.

[0004] The turning device is generally installed on the turbine turning box at the coupling of the turbine and the generator, meshing with the gear on the turbine end rotor installed at the turbine coupling, and driven by an electric motor to realize continuous and stable operation of the shaft system. It is required that the turning device can automatically disengage from the gear on the rotor after the steam impulses the rotor and exceeds the turning speed; the turning device can automatically mesh with the gear on the rotor when the unit is shut down and decelerated to zero speed. Therefore, the turning device is required to have the characteristics of safety and reliability, flexible start and throw, stable transmission, compact and reasonable structure, and easy operation. However, after the turning device leaves the factory, it often fails to start when the turning device is needed on the turbine unit; the turning device seriously collides with the turbine end rotor gear when it is put into operation; the turning device cannot be thrown away or thrown away in place after the rotor is shut down and decelerated; the turning motor current is too large, etc. Due to the problems of the turning device, the turbine unit cannot be started or shut down normally according to the node date, causing serious economic losses.

[0005] Therefore, in order to ensure that the winch can be used normally and stably after production and assembly, it is extremely important to conduct functional tests on the engagement and disengagement of the winch before it leaves the factory. Functional tests on the winch before it leaves the factory, repeated simulated engagement and disengagement tests of the winch, and monitoring of the winch motor parameters are important means to ensure that the winch can operate smoothly after leaving the factory. Summary of the invention

[0006] The technical problem to be solved by the present invention is how to provide a test device which can simply, effectively and accurately simulate the engagement, transmission and disengagement of a turning gear device and a turbine rotor.

[0007] In order to solve the above technical problems, the technical solution of the present invention is to provide a turbine cranking automatic cycle commissioning test equipment, characterized in that it includes a test bench, a cranking test control module and a hydraulic oil station module, the test bench includes a test bench seat for installing the cranking gear, a simulated rotor is provided in the test bench seat, the simulated rotor is connected to a test bench simulated large gear for cooperating with the cranking gear meshing pinion, the test bench seat is provided with controllable pressure lubricating oil, the two ends of the simulated rotor are connected to the outside of the test bench seat through a simulated rotor shaft, one end of the simulated rotor shaft is connected to a hydraulic motor and the other end is connected to a brake; the cranking test control module includes a control system, the control system is connected to the cranking gear and the test bench and provides power, the test bench is provided with hydraulic, speed, torque, displacement signal sensors and feedback signals to the control system; the hydraulic oil station module provides lubricating oil to the test bench and the cranking gear through a solenoid valve, and provides power and loads back pressure to the test bench simulated rotor.

[0008] Preferably, the hydraulic oil station module includes an electric motor 1, which drives an oil pump 1 to supply oil to the hydraulic motor through a one-way valve 1, a filter 1, and a solenoid valve 1, and a relief valve 2 for setting the oil supply pressure, a pressure gauge 1 for displaying the oil supply pressure, and a pressure switch 1 for issuing a pressure indication signal are provided between the solenoid valve 1 and the oil port B; the oil outlet of the hydraulic motor is connected to the oil port C, and a pressure gauge 2 for displaying the oil pressure and a relief valve 3 for setting the pressure are provided at the oil port C, and a cooler 1 is connected behind the relief valve 3; the hydraulic oil station module also includes an electric motor 2, which drives an oil pump 2 to supply oil to the turning gear through an oil outlet D, and a relief valve 4 for safety protection and a pressure gauge 3 for displaying the oil supply pressure are provided at the outlet of the oil pump 2; the test bench is connected to the turning gear through a hose, and the test bench is provided with an oil port E, and the hydraulic oil in the turning gear returns to the hydraulic oil station module through the test bench, the oil port E, the electric motor, and the oil pump, and a one-way valve and a filter are provided on the return oil line.

[0009] Preferably, a one-way valve 2 for protection is also provided between the solenoid valve 1 and the oil port B.

[0010] The present invention is an advance simulation test of whether the turbine cranking gear can smoothly achieve operation engagement and smooth launch with the turbine rotor after leaving the factory, so as to ensure that the turbine operation cranking gear can work smoothly after leaving the factory. The present invention makes an innovative design to the traditional cranking gear test platform, and realizes the automatic cycle engagement and disengagement between the operation cranking gear and the simulated rotor of the turbine through the PLC control module; the inertia and speed of the turbine rotor are simulated through the coordinated use of the hydraulic motor, the hydraulic oil station and the electromagnetic clutch; the present invention uses low-cost and small parts to simulate heavy parts through the innovative design of traditional processes and the invention of the existing cranking gear test bench, which reduces the production cost of the enterprise, enhances the functional reliability of the product after leaving the factory, improves efficiency, controls product quality and reduces labor and production costs, and can provide real-time production data for workshop production, and enhance the enterprise's scientific and technological innovation and management capabilities.

[0011] The research and development points of the present invention are as follows: 1. It provides a programmable control system for the test bench. The PLC programmable controller is used to issue instructions to the cranking test bench to control the various actions of the test bench oil station, hydraulic motor, various solenoid valves and braking devices, and collect and analyze the cranking gear position, speed, torque, current and other signals fed back from the test bench to the control system; 2. It provides a hydraulic oil station module for controlling the test bench to simulate the rotor speed and torque. The hydraulic oil station provides power for the test bench to simulate the rotor speed, simulates the turbine run, and provides back pressure for the simulated rotor through the action of two solenoid valves and hydraulic motors to simulate the large torque and inertia of the rotor; 3. It provides a test bench braking system so that the test bench rotor can be quickly braked after the cranking completes one engagement and disengagement, thereby improving the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the structural schematic diagram of the test bench;

[0013] Figure 2 This is the functional connection diagram of the cranking test control module;

[0014] Figure 3 This is a functional connection diagram of the hydraulic oil station module;

[0015] Figure 4 This is the cranking test flow chart. DETAILED DESCRIPTION

[0016] In order to make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0017] Example

[0018] like Figure 1As shown, the test bench includes a test bench seat 2 for installing the turning gear 1, a simulated rotor 5 is arranged inside the test bench seat 2, and the simulated rotor 5 is connected to a test bench simulated large gear 4 that cooperates with the turning gear meshing pinion 3. The two ends of the simulated rotor 5 are connected to the outside of the test bench seat 2 through a simulated rotor shaft 6. The inside of the test bench seat 2 is provided with controllable pressure lubricating oil, and one end of the simulated rotor shaft 6 is connected to a hydraulic motor 7 and the other end is connected to a brake 8. The specific process is: the turning gear 1 is installed on the test bench seat 2, and the installation clearance between the turning gear meshing pinion 3 and the test bench simulated large gear 4 is the same as the actual installation clearance of the turning gear on site. The turning gear 1 itself is equipped with a turning gear meshing solenoid valve, which is used to control the external hydraulic oil to enter the turning gear 1 to control the turning gear switching device and then push the turning gear meshing pinion 3 to move horizontally, so as to achieve the meshing of the turning gear meshing pinion 3 and the test bench simulated large gear 4. When the turning gear meshing solenoid valve is started, the brake 8 is started at the same time, the test bench simulated large gear 4 is locked, the turning gear meshing pinion 3 will move horizontally and collide with the test bench simulated large gear 4; the turning gear motor is horizontally connected to the turning gear meshing pinion 3 to provide power for the turning gear meshing pinion 3 to rotate. Start the turning gear motor, under the action of the motor, the turning gear meshing pinion 3 continues to move horizontally and fully meshes with the test bench simulated large gear 4. After full meshing, the turning gear limit switch is triggered and a full meshing signal is sent. The full meshing signal is fed back to the test bench control system through the displacement sensor on the test bench, and then the brake 8 is released, and the oil output of the hydraulic motor 7 is loaded through the overflow valve 3 RV3. The load of the hydraulic motor 7 can be adjusted by adjusting the set pressure of the overflow valve 3 RV3. By increasing the load of the hydraulic motor 7, the test bench back pressure system is started to enhance the rotor back pressure of the test bench simulated large gear 4. The turning gear 1 drives the test bench simulated large gear 4 with increased back pressure to rotate together, and the turning function is realized. After 30 seconds, the hydraulic motor 7 is started. At this time, the speed of the test bench simulated large gear 4 increases under the action of the hydraulic motor 7. When the speed of the test bench simulated large gear 4 is greater than the turning gear meshing pinion 3, the test bench simulated large gear 4 actively drives the turning gear meshing pinion 3 to rotate. Under the action of the test bench simulated large gear 4, the turning gear meshing pinion 3 is disengaged. At this time, the turning gear 1 completes a meshing and disengaging process on the test bench. Repeat the above steps 200 times under the action of the test bench control system.

[0019] Crank test control module Figure 2As shown, the turning motor controls the turning speed, motor start and stop and other functions through computer download control program; the control system on the upper right provides 380V power source to the turning equipment, and provides power source to the turning motor, hydraulic oil station module and test bench brake 8; the control system provides 24v DC power supply to the test bench, and provides power to the test bench signal acquisition, display and other systems; the lower left is the test bench, which is equipped with hydraulic, speed, torque, displacement and other signal sensors, and feedback signals to the control system, and the lower right is the hydraulic oil station module, which provides lubricating oil to the test bench and turning through the solenoid valve, and provides power and load back pressure to the test bench simulated rotor 5. The entire experimental system has a simple and compact structure.

[0020] Hydraulic oil station module such as Figure 3As shown, the hydraulic oil station module has the following three functions: 1. Turning loading function. The test bench uses the hydraulic motor 7 as the load, and the hydraulic oil station module provides oil supply and loading functions for the hydraulic motor 7. 2. Turning engagement function. The hydraulic oil station module can provide the turning gear with hydraulic oil of specified pressure through the test bench. The hydraulic oil pushes the turning gear engagement pinion 3 to move axially along the gear shaft, so that the turning gear engagement pinion 3 is engaged with the test bench simulated large gear 4. 3. Oil pumping function. The oil in the test bench is filtered and then pumped back to the oil tank. The implementation process is as follows: the motor M1 drives the oil pump P1 to supply oil to the hydraulic motor 7. The pressure oil from the oil pump passes through the one-way valve CV1, the filter FL1, and the solenoid valve SV1 to the oil port B, and the oil port B is connected to the oil inlet of the hydraulic motor 7. The oil supply pressure of the hydraulic motor 7 is set by the overflow valve RV2, the pressure gauge PG1 displays the oil supply pressure, and the pressure switch PS1 sends a pressure indication signal. The one-way valve CV2 plays a protective role. When the speed of the hydraulic motor 7 is too fast and the oil pump P1 is unable to supply oil in time, the hydraulic oil in the oil tank enters the hydraulic motor 7 through the one-way valve CV2. The oil outlet of the hydraulic motor 7 is connected to the oil port C, and the pressure gauge PG2 displays the pressure of the oil outlet of the hydraulic motor 7. The oil output of the hydraulic motor 7 is loaded through the overflow valve RV3. The set pressure of the overflow valve RV3 can be manually adjusted to adjust the load of the hydraulic motor 7, thereby changing the load of the turning gear 7. The overflow valve RV3 is a heating element, and a cooler CL1 is connected to the back to cool the hydraulic oil. The motor M2 drives the oil pump P2 to supply oil to the turning gear cutting device, in which the overflow valve RV4 is a safety valve. The pressure oil from the oil pump goes directly to the oil port D, and the oil port D is connected to the oil cylinder of the turning gear cutting device. The oil supply pressure of the oil cylinder of the turning gear cutting device is displayed by the pressure gauge PG3. The oil port E is the oil extraction port. The hydraulic oil in the test bench is connected to the turning test bench through a hose, and is sucked into the hydraulic oil station through the motor M3 and the oil pump P3. It passes through the one-way valve CV3 and the filter FL2, that is, the hydraulic oil in the turning test device is filtered and then drawn back to the oil tank. The oil tank has a temperature control function. There is a solenoid valve SV1 at the outlet of the oil pump P1. When working normally, the solenoid valve SV1 is not energized, and the pressure oil passes through the solenoid valve SV1 to the oil port B; when heating is required, the solenoid valve SV1 is energized, and the pressure oil is reversed at the solenoid valve SV1 and returns to the oil tank through the overflow valve RV1. The overflow valve RV1 sets the pressure to 3.0MPa. The hydraulic oil is heated by circulating through the circuit, and the hydraulic oil in the oil tank can be heated to the required temperature. A cooler CL1 is installed on the circuit from the oil port C to the oil tank to cool the return oil of the hydraulic motor. In addition, this oil station can provide two lines of pressure oil for the test bench. The solenoid valve SV2 is normally closed with power. When the solenoid valve SV2 is energized, there is no pressure at port A. When the power is off, the pressure at port A is the same as that at port B.

Claims

1. A steam turbine turning automatic cycle commissioning test equipment, characterized in that: The invention comprises a test bench, a cranking test control module and a hydraulic oil station module, wherein the test bench comprises a test bench seat (2) for mounting a cranking gear (1), a simulated rotor (5) is arranged inside the test bench seat (2), the simulated rotor (5) is connected to a test bench simulated large gear (4) for cooperating with a cranking gear meshing small gear (3), the test bench seat (2) is provided with controllable pressure lubricating oil, the two ends of the simulated rotor (5) are connected to the outside of the test bench seat (2) through a simulated rotor shaft (6), one end of the simulated rotor shaft (6) is connected to a hydraulic motor (7), and the other end is connected to a brake (8); the cranking test control module comprises a control system, the control system is connected to the cranking gear (1) and the test bench and provides power, the test bench is provided with hydraulic pressure, rotation speed, torque, displacement signal sensors and feedback signals to the control system; The hydraulic oil station module supplies lubricating oil to the test bench and the turning gear (1) through a solenoid valve, and provides power and loading back pressure to the test bench simulation rotor (5); The hydraulic oil station module comprises an electric motor (M1), the electric motor (M1) drives an oil pump (P1) to pass through a one-way valve (CV1), a filter (FL1), and a solenoid valve (SV1) to reach an oil port B to supply oil to a hydraulic motor (7), and between the solenoid valve (SV1) and the oil port B are provided with an overflow valve (RV2) for setting the oil supply pressure, a pressure gauge (PG1) for displaying the oil supply pressure, and a pressure switch (PS1) for issuing a pressure indication signal; the oil outlet of the hydraulic motor (7) is connected to an oil port C, and a pressure gauge (PG2) for displaying the oil pressure and an overflow valve (RV3) for setting the pressure are provided at the oil port C, and the overflow valve (RV3) for displaying the oil pressure is provided at the oil port C. The hydraulic oil station module further comprises a second motor (M2), the second motor (M2) drives a second oil pump (P2) to supply oil to the turning gear (1) through an oil outlet D, and an overflow valve (RV4) for safety protection and a pressure gauge (PG3) for displaying the oil supply pressure are provided at the outlet of the second oil pump (P2); the test bench (2) is connected to the turning gear (1) through a hose, and the test bench (2) is provided with an oil port E, and the hydraulic oil in the turning gear (1) is returned to the hydraulic oil station module through the test bench (2), the oil port E, the motor (M3), and the oil pump (P3), and a one-way valve (CV3) and a filter (FL2) are provided on the return oil line; A one-way valve 2 (CV2) for protection is also provided between the solenoid valve 1 (SV1) and the oil port B.

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